MAHESH TUTORIALS SECTION - A

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1 S.S.C. MAHESH TUTORIALS Paper - I Test - I Batch : SB Marks : 0 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : (i) ma =... A. (a) 0 3 A (b) 0 3 A (c) 0 6 A (d) 0 6 A (ii) The horizontal rows in the periodic table are.... (a) periods (b) groups (c) columns (d) lines Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric current (a) Joule (ii) Electric charge (b) Ampere (iii) Electric resistance (c) Ohm (iv) Potential difference (d) Coulomb (e) Volt Q.I (C) State whether the following statements are True or False : (i) Ammeter is always connected in series. (ii) Eka boron is known as Germanium. Q.II (A) Give scientific reasons : (Any One) (i) Concave mirrors are used in solar devices. (ii) The family of noble gases is called as zero group. Q.II (B) Answer the following as required : (Any Two) (i) Solve the following numerical : A current of 0. A is flowing through a bulb for 5 minutes. Find the charge that is flowing through the circuit. (ii) Draw a ray diagram for object at focus for a concave mirror. (iii) State the Newlands law of octaves. 4

2 Paper - I SECTION - B Q.I (A) Fill in the blanks : (i) Response to the stimulus of touch is called... whereas response to the stimulus of chemicals is called as.... (ii)... is the largest gland in the body. Q.I (B) State whether the following statements are True or False : (i) Mucus protects the inner lining of the stomach from the action of acids. (ii) Afferent nerves carry impulses from the brain to the sensory organs. Q.II (A) Give scientific reasons : (Any One) (i) Physical states of reactants and products are mentioned while writing a chemical equation. (ii) Digestion of food starts in the mouth itself. Q.II (B) Answer the following : (Any Two) (i) Write a note on reflex action. (ii) Distinguish between Voluntary movements and Involuntary movements. (iii) What happens to the food in the large intestine? (iv) Balance the following chemical reactions with the help of balanced equations : Iron reacts with sulphur. 4 Q.III (i) (ii) (iii) Draw a neat and labelled diagram of the following : (Any One) Neuron. Digestive glands (Liver). Human digestive system. Best Of Luck

3 Paper - I S.S.C. MAHESH TUTORIALS Test - I Batch : SB Marks : 0 SCIENCE Chapter :,, 4, 6, 0, Date : MODEL ANSWER PAPER Time : hr. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : (i) ma = 0 3 A. (ii) The horizontal rows in the periodic table are periods. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric current Ampere (ii) Electric charge Coulomb (iii) Electric resistance Ohm (iv) Potential difference Volt A.I (C) State whether the following statements are True or False : (i) True. (ii) False. Eka boron is known as Scandium. A.II (A) Give scientific reasons : (Any One) (i). Solar devices like solar cooker or solar water heater uses solar energy to cook food or heat water.. When Sun ray falls on the concave mirror, they converge. 3. Due to convergence the intensity of Sun rays increases and the food or water is heated faster. Hence concave mirrors are used in solar devices. (ii). Zero group or group 8 is a family of inert gases also called as noble gases or rare gases.. In their atoms, all the electronic shells including the outermost shell are completely filled. They have stable electronic configuration with complete duplet (Helium) or complete octet (Neon, Argon etc). 3. So, atoms do not gain, lose or share electrons and hence have zero valency. 4. Hence, the family of noble gases is called as zero group.

4 A.II (B) Answer the following as required : (Any Two) (i) Given : Current (I) = 0. A Time (t) = 5 min. = 300 sec. To find : Electric charge (Q) =? Formula : Q = It Q = Q = 60 C The charge flowing through the circuit is 60 C. Paper - I (ii) A ray diagram for object at focus for a concave mirror. C B A F P Image position : At infinity. Nature : Real, inverted and highly magnified. (iii) When the elements are arranged in increasing order of their atomic masses, the properties of every eighth element are similar to the first, as in the octave of music. SECTION - B A.I (A) Fill in the blanks : (i) Response to the stimulus of touch is called seismonastic movement whereas response to the stimulus of chemicals is called as chemotropism. (ii) Liver is the largest gland in the body. A.I (B) State whether the following statements are True or False : (i) True. (ii) False. Afferent nerves carry impulses from the sensory organs to the nerves. A.II (A) Give scientific reasons : (Any One) (i). The equation that gives more information about the chemical reaction is known as more informative or information giving equation.

5 Paper - I. The chemical equation can be made more informative in three ways : (a) By indicating the physical states of reactants and products. (b) By indicating the heat changes taking place in the equation. (c) By indicating the conditions under which the reaction takes place. So, physical states of reactants and products are mentioned while writing a chemical equation. (ii). In the mouth, the food is crushed and wetted with saliva secreted by the salivary glands so the food can smoothly pass through the soft lining of the alimentary canal.. The food that we take is of complex nature. 3. It is converted into simpler molecules with the help of biological catalysts called as enzymes. 4. Enzyme salivary amylase breaks down starch into a simple sugar maltose. 5. Thus digestion of food starts in the mouth itself. A.II (B) Answer the following : (Any Two) (i). Any sudden change in response to some happening in the environment, is called as reflex action.. We react to such a situation without thinking about it or without feeling in control of our reactions. 3. Example : When we touch a vessel containing very hot tea, immediately the hand is withdrawn. 4. In this case, the nerves that detect pain are connected to the nerves that bring about the action of the muscle, hence the action is completed quickly. 5. Nerves from all over the body meeting in a bundle in such a connection is called as the spinal cord. 6. Hence reflex arcs are formed in the spinal cord, although the messages reach the brain. (ii) Voluntary movements and Involuntary movements. Voluntary movements. Movements which are under our control are called voluntary movements.. Voluntary movements require thinking. 3. Voluntary movements are controlled by cerebellum. 4. Eg. Moving a table, kicking a ball, walking, clapping hands etc. Involuntary movements. Movements which are not under our control are called involuntary movements.. Involuntary movements do not require thinking. 3. Involuntary movements are controlled by midbrain and hindbrain. 4. Eg. Blood flow, breathing, sneezing etc.

6 Paper - I (iii). The undigested food and the residue of the digested food pass into the large intestine (about.5 m long).. This part of the intestine does not have any digestive function as the digestion is already completed. 3. The walls of the large intestine have villi which absorb most of the water and salts. 4. The rest of the material is removed from the body through the anus. Here, the exit is regulated by the muscle called sphincter. (iv) A.III (i) When iron reacts(heated) with sulphur to give iron sulphide. Fe (s) + S (s) FeS (s) Iron Sulphur Iron sulphide Draw a neat and labelled diagram of the following: (Any One) Neuron. Dendrites Cyton (cell body) Nucleus Axon (ii) Digestive glands (Liver). Liver Gall bladder Common duct

7 Paper - I (iii) Human digestive system. Oral cavity Salivary glands Oesophagus Liver Gall bladder Stomach Pancreas Large intestine Small intestine Anus

8 S.S.C. MAHESH TUTORIALS Paper - II Test - I Batch : SB Marks : 0 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : (i) The unit of electric charge is.... (a) ampere (b) coulomb (c) volt (d) ohm (ii) The element eka-aluminium is called as.... (a) gallium (b) germanium (c) silicon (d) scandium Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Plane mirror (a) Rear view mirror (ii) Concave mirror (b) At laughing gallery (iii) Convex mirror (c) At a hair dresser (iv) Irregular curved mirror (d) At a dentist Q.I (C) State whether the following statements are True or False : (i) Voltmeter is always connected in series with the device. (ii) Newlands arranged elements based on their atomic number. Q.II (A) Give scientific reasons : (Any One) (i) Metals are good conductors of electricity. (ii) Chlorine is placed in VII A group in the modern periodic table. Q.II (B) Answer the following as required : (Any Two) (i) What are the rules for drawing ray diagrams for the formation of image by spherical mirror? (ii) Distinguish between Conductors and Insulators. (iii) State the Newlands law of octaves. 4

9 Paper - II SECTION - B Q.I (A) Fill in the blanks : (i) Reactants are represented on.... (ii) The food is pushed forward in the canal due to rhythmic contraction and relaxation of the muscles of the canal called as.... Q.I (B) State whether the following statements are True or False : (i) Chemical change is a temporary change. (ii) (g) indicates the physical state as solid. Q.II (A) Distinguish between : (Any One) (i) Physical change and Chemical change. (ii) Exothermic reaction and Endothermic reacion. Q.II (B) Answer the following : (Any Two) (i) What is tropic movement? Describe the different types of tropic movements. (ii) What happens to the food in the mouth? (iii) How are nutrients classified based on their functions? (iv) Distinguish between Growth dependent movements and Growth independent movements. 4 Q.III (i) (ii) (iii) Draw a neat and labelled diagram of the following: (Any One) Reflex arc. Pancreas with their associated structures. Human digestive system. Best Of Luck

10 Paper - II S.S.C. MAHESH TUTORIALS Test - I Batch : SB Marks : 0 SCIENCE Chapter :,, 4, 6, 0, Date : MODEL ANSWER PAPER Time : hr. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : (i) The unit of electric charge is coulomb. (ii) The element eka-aluminium is called as gallium. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Plane mirror At a hair dresser (ii) Concave mirror At a dentist (iii) Convex mirror Rear view mirror (iv) Irregular curved mirror At laughing gallery A.I (C) State whether the following statements are True or False : (i) False. Voltmeter is always connected in parallel with the device. (ii) False. Newlands arranged elements based on their atomic mass. A.II (A) Give scientific reasons : (Any One) (i). Metals contain a large number of free electrons.. When a potential difference (P.D.) is applied between the two ends of the wire, these free electrons move easily through, the conductor. 3. This motion of free electrons constitutes an electric current. Hence metals are good conductors of electricity. (ii). Number of valence electrons is equal to the group number.. Chlorine has atomic number 7 and hence its electronic configuration is, 8, There are 7 electrons in the valence shell. 4. Hence, Chlorine is placed in VII A group in the modern periodic table.

11 Paper - II A.II (B) Answer the following as required : (Any Two) (i) The rules are as follows :. If the incident ray is parallel to the principal axis, then the reflected ray passes through focus.. If the incident ray is passing through the focus then the reflected ray is parallel to the principal axis. 3. If the incident ray passes through the centre of curvature, the reflected ray traces the same path. (ii) Conductors and Insulators. Conductors. The substances which have very low electrical resistances are called conductors.. They contain a large number of free electrons. 3. Conductors are mostly metals. Insulators. Those substances which have infinitely high electrical resistances are called Insulators.. They contain practically no free electrons. 3. Insulators are mostly non metals. (iii) When the elements are arranged in increasing order of their atomic masses, the properties of every eighth element are similar to the first, as in the octave of music. SECTION - B A.I (A) Fill in the blanks : (i) Reactants are represented on left hand side. (ii) The food is pushed forward in the canal due to rhythmic contraction and relaxation of the muscles of the canal called as peristaltic movement. A.I (B) State whether the following statements are True or False : (i) False. It is a permanent change. (ii) False. (g) indicates the physical state as gas.

12 Paper - II A.II (A) Give scientific reasons : (Any One) (i) Physical change and Chemical change. (ii) Physical change. In this change, the composition of substance does not change and no new substance is formed.. There is a change only in physical properties. 3. This change is temporary. 4. The original substance can be recovered by simple means. 5. Eg.: Steam is condensed. Exothermic reaction and Endothermic reacion. Exothermic reaction. The reaction where heat energy is evolved or liberated is called as exothermic reaction.. Temperature of the reaction mixture rises. 3. Generally, the reactions are fast. 4. Products are more stable. 5. These reactions take place at lower temperatures. 6. Eg.: Neutralization reaction. Chemical change. In this change, the composition of substance changes and a new substance is formed.. There is a change in both physical and chemical properties. 3. This change is permanent. 4. The original substance cannot be recovered by simple means. 5. Eg.: Ripening of fruit, milk is converted to curd. Endothermic reaction. The reaction where heat energy is absorbed is called as endothermic reaction.. Temperature of the reaction mixture lowers. 3. Generally, the reactions are slow. 4. Reactants are more stable. 5. These reactions take place at high temperatures. 6. Eg.: Calcium is strongly heated. A.II (B) Answer the following : (Any Two) (i) The movement or growth of any part of a plant in response to an external stimulus is called tropism or tropic movement. Tropic movements are of three types :. Phototropic movement (Phototropism) : The movement of a plant in response to the stimulus of light is called phototropism. E.g. the shoot system of any plant responds towards the stimulus of light i.e. it grows in the direction of source of light.. Gravitropic movement (Gravitropism) : The root system of the plants responds to the stimulus of gravity. This movement is called as gravitropic movement.

13 Paper - II *3. Hydrotropic movement (Hydrotropism) : The root system of the plants responds to the stimulus of water. This movement is called hydrotropic movement. 4. Chemotropic movement (Chemotropism) : It is the movement of a plant part in response to certain chemicals. E.g. the growth of pollen tube towards the ovules. (ii). The alimentary canal begins with the mouth.. A variety of food items have to pass through the digestive tract. So, the food is processed in the mouth to generate particles with small size. 3. Such crushed food is wetted with saliva secreted by the salivary glands so the food can smoothly pass through the soft lining of the alimentary canal. 4. The food that we take is of complex nature. It is converted into simpler molecules with the help of biological catalysts called as enzymes. Enzyme salivary amylase breaks down starch into a simple sugar maltose. Thus digestion starts in the mouth itself. (iii) Based on their functions nutrients are divided into three types :. Energy giving nutrients : Carbohydrates, fats.. Body building nutrients : Proteins. 3. Protective and regulating nutrients : Vitamins and minerals. (iv) Growth dependent movements and Growth independent movements. Growth dependent movements. Growth dependent movements result in growth of the plants.. Growth dependent movements are also called as tropic movements. 3. Growth dependent movements are in response to the stimulus of light, water, gravity etc. 4. Eg. Bending of stem towards light, movement of roots towards gravity and water. Growth independent movements. Growth independent movements do not result in growth of the plants.. Growth independent movements are also known as nastic movements. 3. Growth independent movements are in response to the stimulus of touch. 4. Eg. Closing of leaflets in mimosa plant, shutting of Venus flytrap.

14 Paper - II A.III (i) Draw a neat and labelled diagram of the following: (Any One) Reflex arc. Spinal chord (CNS) Message to brain Sensory neuron Receptors-heat pain Receptors in skin Motor neuron Relay neuron Effector-muscle in arm (ii) Pancreas with their associated structures. Gall bladder Bile duct Common duct Pancreatic duct Pancreas

15 Paper - II (iii) Human digestive system. Oral cavity Salivary glands Oesophagus Liver Gall bladder Stomach Pancreas Large intestine Small intestine Anus

16 S.S.C. MAHESH TUTORIALS Paper - III Test - I Batch : SB Marks : 0 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : (i) A ray of light parallel to principal axis after reflection from concave mirror passes through.... (a) centre of curvature (b) focus (c) pole (d) optical centre (ii) The arrangement of elements in a group of three is called.... (a) triad (b) octaves (c) periodicity (d) triangle Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Mendeleev (a) Octaves (ii) Dobereiner (b) Periodic law (iii) Newlands (c) Noble gas (iv) Helium (d) Triads Q.I (C) State whether the following statements are True or False : (i) The conventional direction of flow of current is from positive terminal to negative terminal. (ii) Isotopes have same atomic masses. Q.II (A) Give scientific reasons : (Any One) (i) Wood and rubber are good insulators. (ii) Concave mirror is called converging mirror. Q.II (B) Answer the following as required : (Any Two) (i) An image is formed 5 cm behind a convex mirror of focal length 0 cm. At what distance is the object placed from the mirror? (ii) Draw symbol of. Ammeter. Resistance 3. Battery 4. Wire crossing. (iii) State Dobereiners law of triads. P, Q, R are elements of a Dobereiner's triad. If atomic mass of P is 35.5 and R is 7, what would be the atomic mass of Q? 4

17 Paper - III SECTION - B Q.I (A) Fill in the blanks : (i) Ice changing to water is an example of... change. (ii) The digested food is absorbed by the... in the small intestine. Q.I (B) State whether the following statements are True or False : (i) The loss of water from the plants is known as translocation. (ii) The process is which the soluble digested food is absorbed into the blood is known as assimilation. Q.II (A) Give scientific reasons : (Any One) (i) Roots of plants go away from light. (ii) Conversion of ice into water is a physical change. Q.II (B) Answer the following as required : (Any Two) (i) Write a short note on Co-ordination in plants. (ii) Balance the following chemical reaction with proper symbols H S + O H O + SO (iii) Balance the following chemical reaction with proper symbols ZnS + O ZnO + SO (iv) How are neurons classified? State their functions. 4 Q.III (i) (ii) (iii) Draw a neat and labelled diagram of the following : (Any One) Neuron. Reflex arc. Human digestive system. Best Of Luck

18 Paper - III S.S.C. MAHESH TUTORIALS Test - I Batch : SB Marks : 0 SCIENCE Chapter :,, 4, 6, 0, Date : MODEL ANSWER PAPER Time : hr. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : (i) A ray of light parallel to principal axis after reflection from concave mirror passes through focus. (ii) The arrangement of elements in a group of three is called triad. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Mendeleev Periodic law (ii) Dobereiner Triads (iii) Newlands Octaves (iv) Helium Noble gas A.I (C) State whether the following statements are True or False : (i) True. (ii) False. Isotopes are atoms of the same element having same atomic number but different atomic masses. A.II (A) Give scientific reasons : (Any One) (i). Those substances which have infinitely high electrical resistance are called insulators.. Wood and rubber have high resistance and negligible free electrons for conduction of electricity. 3. Hence wood and rubber are good insulators. (ii). When rays of light parallel to the principal axis are incident on concave mirror they converge.. After convergence they meet at one point on the principal axis, hence concave mirror is called converging mirror. A.II (B) Answer the following as required : (Any Two) (i) Given : Image distance (v) = 5 cm Focal length (f) = 0 cm To find : Object distance (u) =?

19 Paper - III Formula : Solution : u = f v + u = f v + u = f v u = 0 5 u = 0 u = 0 u = 0cm. The object is placed in front of the convex mirror at a distance of 0 cm. (ii). Ammeter. Resistance + A 3. Battery 4. Wire crossing. + (iii) Dobereiner's law of triads : He arranged chemically similar elements in the increasing order of their atomic masses in a group of three which is known as "Dobereiner's Triads". In a Triad, atomic mass of middle element is approximately equal to the mean of atomic masses of other two elements in that Triad. Atomic weight of Q = = = 6.5 Atomic weight of P = 8.5. SECTION - B Atomic weight of R A.I (A) Fill in the blanks : (i) Ice changing to water is an example of physical change. (ii) The digested food is absorbed by the villi in the small intestine.

20 Paper - III A.I (B) State whether the following statements are True or False : (i) False. The loss of water from the plants is known as transpiration. (ii) False. The process is which the soluble digested food is absorbed into the blood is known as absorption. A.II (A) Give scientific reasons : (Any One) (i). The roots of plants respond to the stimulus of gravity and water.. These responses are called gravitropic and hydrotropic movements respectively. 3. Plants absorb water in which minerals are dissolved, from the soil with the help of their roots. 4. Therefore, roots of plants go away from light. (ii). On heating, ice melts into water and on the other hand when water is cooled, it freezes into ice.. In this change, only the physical property of water i.e state of water changes as both ice and water chemically are water only. Therefore, no new substance is formed. Hence, conversion of ice into water is a physical change. A.II (B) Answer the following : (Any Two) (i). Plants do not have a nervous system or muscular system.. The movements exhibited by plants are mainly in response to the stimulus. 3. In certain sensitive plants like Mimosa, movement is in response to the stimulus of touch. This movement is known as seismonastic movement. There is no growth involved in this movement. 4. On the other hand, the movement of a seedling is because of growth. If growth is prevented, it does not exhibit any movement. 5. Thus, we conclude that plants exhibit two types of movement, one which is growth dependent movement and the other which is growth independent movement. (ii) H S + 3O H O + SO (iii) ZnS + 3O ZnO + SO (iv). Neurons are of three types i.e. sensory neuron, motor neuron and association neuron.

21 Paper - III A.III (i). Sensory neurons conduct impulses from the sense organs to the brain and spinal cord. 3. Motor neurons conduct impulses from the brain and spinal cord to the effector organs like muscles and glands. 4. Association neurons perform integrative functions of the nervous system. Draw a neat and labelled diagram of the following: (Any One) Neuron. Dendrites Cyton (cell body) Nucleus Axon (ii) Reflex arc. Spinal chord (CNS) Message to brain Sensory neuron Receptors-heat pain Receptors in skin Motor neuron Relay neuron Effector-muscle in arm

22 Paper - III (iii) Human digestive system. Oral cavity Salivary glands Oesophagus Liver Gall bladder Stomach Pancreas Large intestine Small intestine Anus

23 S.S.C. MAHESH TUTORIALS Paper - IV Test - I Batch : SB Marks : 0 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : (i) The centre of the spherical mirror is called.... (a) pole (b) centre of curvature (c) principal axis (d) focus (ii) Elements showing properties of both metals and non-metals are called as.... (a) metals (b) noble elements (c) non metal (d) metalloids Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric current (a) Joule (ii) Electric charge (b) Ampere (iii) Electric resistance (c) Ohm (iv) Potential difference (d) Coulomb (e) Volt Q.I (C) State whether the following statements are True or False : (i) Silver and copper are good conductors. (ii) Mendeleev arranged 63 elements in the periodic table. Q.II (A) Give scientific reasons : (Any One) (i) Connecting wires in a circuit is made of copper and aluminium. (ii) Concave mirrors are used in solar devices. Q.II (B) Answer the following as required : (Any Two) (i) If you are given a part of hollow spherical glass, how will you convert it into concave mirror? (ii) Draw a ray diagram for object between F and C for a concave mirror. (iii) State the Dobereiner s triads law. 4

24 Paper - IV SECTION - B Q.I (A) Fill in the blanks : (i) Products are represented on.... (ii) Carbondioxide enters into the leaves through tiny pores present on the surface of the leaf called.... Q.I (B) State whether the following statements are True or False : (i) Motor neurons conduct impulses from effector organs like muscles and glands to brain and spinal cord. (ii) Mucus protects the inner lining of the stomach from the action of acids. Q.II (A) Give scientific reasons : (Any One) (i) Physical states of reactants and products are mentioned while writing a chemical equation. (ii) Rate of breathing is faster in aquatic animals. Q.II (B) Answer the following : (Any Two) (i) What is tropic movement? Describe the different types of tropic movements. (ii) Classify the following into physical change and chemical change :. Rusting of iron. Water turns into ice 3. Ripening of mango 6. Magnetisation of iron nail. (iii) What happens to the food in the mouth? (iv) Describe the basic steps of nutrition in all animals. 4 Q.III (i) (ii) (iii) Draw a neat and labelled diagram of the following: (Any One) Human digestive system. Pancreas with their associated structures. Neuron. Best Of Luck

25 Paper - IV S.S.C. MAHESH TUTORIALS Test - I Batch : SB Marks : 0 SCIENCE Chapter :,, 4, 6, 0, Date : MODEL ANSWER PAPER Time : hr. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : (i) The centre of the spherical mirror is called pole. (ii) Elements showing properties of both metals and non-metals are called as metalloids. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric current Ampere (ii) Electric charge Coulomb (iii) Electric resistance Ohm (iv) Potential difference Volt A.I (C) State whether the following statements are True or False : (i) True. (ii) True. A.II (A) Give scientific reasons : (Any One) (i). Copper and aluminium are good conductors of electricity.. They have low electrical resistance. 3. As they are malleable and ductile they can be drawn into thin wires. Hence connecting wires in a circuit is made of copper or aluminium. (ii). Solar devices like solar cooker or solar water heater uses solar energy to cook food or heat water.. When Sun ray falls on the concave mirror, they converge. 3. Due to convergence the intensity of Sun rays increases and the food or water is heated faster. Hence concave mirrors are used in solar devices.

26 Paper - IV A.II (B) Answer the following as required : (Any Two) (i) The inner side of the hollow spherical glass is concave, hence the outer side should be coated with reflecting layer to make inner side concave mirror. (ii) A ray diagram for object between F and C for a concave mirror. A B' C B F P A' Image position : Beyond centre of curvature. Nature : Real, inverted and magnified. (iii) He arranged chemically similar elements in the increasing order of their atomic weights in a group of three which is known as Dobereiner s triads. In a Triad, atomic mass of the middle element is approximately equal to the mean of atomic masses of other two elements in that triad. SECTION - B A.I (A) Fill in the blanks : (i) Products are represented on right hand side. (ii) Carbondioxide enters into the leaves through tiny pores present on the surface of the leaf called stomata. A.I (B) State whether the following statements are True or False : (i) False. Motor neurons conduct impulses from brain and spinal cord to effector organs. (ii) True. A.II (A) Give scientific reasons : (Any One) (i). The equation that gives more information about the chemical reaction is known as more informative or information giving equation.

27 Paper - IV. The chemical equation can be made more informative in three ways : (a) By indicating the physical states of reactants and products. (b) By indicating the heat changes taking place in the equation. (c) By indicating the conditions under which the reaction takes place. So, physical states of reactants and products are mentioned while writing a chemical equation. (ii). An animal living in water uses oxygen dissolved in water.. The solubility of oxygen in water is much lower. 3. So, the amount of oxygen available is much lesser than air. 4. Hence the rate of breathing is faster in aquatic animals. A.II (B) Answer the following : (Any Two) (i) The movement or growth of any part of a plant in response to an external stimulus is called tropism or tropic movement. Tropic movements are of three types :. Phototropic movement (Phototropism) : The movement of a plant in response to the stimulus of light is called phototropism. E.g. the shoot system of any plant responds towards the stimulus of light i.e. it grows in the direction of source of light.. Gravitropic movement (Gravitropism) : The root system of the plants responds to the stimulus of gravity. This movement is called as gravitropic movement. *3. Hydrotropic movement (Hydrotropism) : The root system of the plants responds to the stimulus of water. This movement is called hydrotropic movement. 4. Chemotropic movement (Chemotropism) : It is the movement of a plant part in response to certain chemicals. E.g. the growth of pollen tube towards the ovules. (ii) Physical change Chemical change. Water turns into ice. Rusting of iron. Magnetisation of iron nail. Ripening of mango (iii). The alimentary canal begins with the mouth.. A variety of food items have to pass through the digestive tract. So, the food is processed in the mouth to generate particles with small size. 3. Such crushed food is wetted with saliva secreted by the salivary glands so the food can smoothly pass through the soft lining of the alimentary canal.

28 Paper - IV 4. The food that we take is of complex nature. It is converted into simpler molecules with the help of biological catalysts called as enzymes. Enzyme salivary amylase breaks down starch into a simple sugar maltose. Thus digestion starts in the mouth itself. (iv) Basic steps of nutrition in animals :. Ingestion : The act of taking food inside.. Digestion : The process of breaking down of complex organic food into simpler soluble substances. This is done mechanically by teeth and chemically with the help of enzymes. 3. Absorption : After digestion is completed soluble digested food is absorbed into the blood. 4. Assimilation : The absorbed food is transported into tissues and cells of the body where they are used to produce energy or for growth and development or stored for future use. 5. Egestion : The undigested and unabsorbed residues of food are thrown out of the body. A.III Draw a neat and labelled diagram of the following: (Any One) (i) Human digestive system. Oral cavity Salivary glands Oesophagus Liver Gall bladder Stomach Pancreas Large intestine Small intestine Anus

29 (ii) Pancreas with their associated structures. Paper - IV Gall bladder Bile duct Common duct Pancreatic duct Pancreas (iii) Neuron. Dendrites Cyton (cell body) Nucleus Axon

30 S.S.C. MAHESH TUTORIALS Paper - V Test - I Batch : SB Marks : 0 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : (i) The S.I. unit of electric current is.... (a) ampere (b) coulomb (c) volt (d) ohm (ii) The law used by Newlands to arrange elements is called.... (a) octaves (b) triad (c) Newlands Law of octaves (d) law of gravity Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric current (a) It (ii) Electric charge (b) Q/t (iii) Potential difference (c) mgh (iv) Electric resistance (d) IR (e) V/I Q.I (C) State whether the following statements are True or False : (i) A concave mirror always forms a real image. (ii) Mendeleev was the first scientist to create a periodic table for the elements. Q.II (A) Give scientific reasons : (Any One) (i) Concave mirrors are used in solar devices. (ii) Connecting wires in a circuit is made of copper and aluminium. Q.II (B) Answer the following as required : (Any Two) (i) A charge of 40 C is flowing through a circuit for 0 minutes. Find the current in the circuit. (ii) Draw a ray diagram for object between pole and focus for a concave mirror. (iii) Explain the demerits of Mendeleev s periodic table. 4

31 Paper - V SECTION - B Q.I (A) Fill in the blanks : (i)... protects the inner lining of the stomach from the action of acids under normal conditions. (ii) The loss of water from the plants is known as.... Q.I (B) State whether the following statements are True or False : (i) Pancreatic amylase breaks down starch into maltose. (ii) Transpiration takes place in the leaves through stomatal openings. Q.II (A) Give scientific reasons : (Any One) (i) Roots of plants go away from light. (ii) Formation of a compound is a chemical change. Q.II (B) Answer the following : (Any Two) (i) Write a short note on Reflex action. (ii) Describe the growth dependent movements in plants. (iii) What are the steps of writing a chemical equation? (iv) Distinguish between Physical change and Chemical change. 4 Q.III (i) (ii) (iii) Draw a neat and labelled diagram of the following : (Any One) Digestive glands (Liver). Villi. Human digestive system. Best Of Luck

32 Paper - V S.S.C. MAHESH TUTORIALS Test - I Batch : SB Marks : 0 SCIENCE Chapter :,, 4, 6, 0, Date : MODEL ANSWER PAPER Time : hr. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : (i) The S.I. unit of electric current is ampere. (ii) The law used by Newlands to arrange elements is called Newlands Law of octaves. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Electric current Q/t (ii) Electric charge It (iii) Potential difference IR (iv) Electric resistance V/I A.I (C) State whether the following statements are True or False : (i) False. A concave mirror forms a real, as well as a virtual image. (ii) True. A.II (A) Give scientific reasons : (Any One) (i). Solar devices like solar cooker or solar water heater uses solar energy to cook food or heat water.. When Sun ray falls on the concave mirror, they converge. 3. Due to convergence the intensity of Sun rays increases and the food or water is heated faster. Hence concave mirrors are used in solar devices. (ii). Copper and aluminium are good conductors of electricity.. They have low electrical resistance. 3. As they are malleable and ductile they can be drawn into thin wires. Hence connecting wires in a circuit is made of copper or aluminium.

33 A.II (B) Answer the following as required : (Any Two) (i) Given : Electric charge (Q) = 40 C Time (t) = 0 min. = 600 sec. To find : Electric current (I) Formula : I = Solution : I = I = I = 7 0 I = 0.7 A The current in the circuit is 0.7 A. Q t Q t Paper - V (ii) A ray diagram for object between pole and focus for a concave mirror. A' B C F B P B' Image position : Behind the mirror. Nature : Virtual, erect and magnified.

34 Paper - V (iii). Hydrogen resembles alkali metals as well as halogens. Therefore, no fixed position could be given to hydrogen in the periodic table.. Isotopes of same elements have different atomic masses; therefore each one of them should be given different position. On the other hand as isotopes are chemically similar, they had to be given same position. 3. At certain places, an element of higher atomic mass has been placed before an element of lower atomic mass. For eg, cobalt (Co = 58.93) is placed before nickel (Ni = 58.7) 4. Some elements placed in the same sub-group had different properties. Eg. Manganese (Mn) is placed with halogens which totally differs in the properties. SECTION - B A.I (A) Fill in the blanks : (i) Mucus protects the inner lining of the stomach from the action of acids under normal conditions. (ii) The loss of water from the plants is known as transpiration. A.I (B) State whether the following statements are True or False : (i) False. Salivary amylase breaks down starch into maltose. (ii) True. A.II (A) Give scientific reasons : (Any One) (i). The roots of plants respond to the stimulus of gravity and water.. These responses are called gravitropic and hydrotropic movements respectively. 3. Plants absorb water in which minerals are dissolved, from the soil with the help of their roots. 4. Therefore, roots of plants go away from light. (ii). Compound is a substance produced by the chemical reaction between two or more elements in a fixed proportion.. Both physical and chemical properties of the compound are different from the properties of its constituent elements. 3. A new substance is formed, which can not be converted into original substance. Hence formation of a compound is a chemical change.

35 Paper - V A.II (B) Answer the following : (Any Two) (i). Any sudden change in response to some happening in the environment, is called as reflex action.. We react to such a situation without thinking about it or without feeling in control of our reactions. 3. Example : When we touch a vessel containing very hot tea, immediately the hand is withdrawn. 4. In this case, the nerves that detect pain are connected to the nerves that bring about the action of the muscle, hence the action is completed quickly. 5. Nerves from all over the body meeting in a bundle in such a connection is called as the spinal cord. 6. Hence reflex arcs are formed in the spinal cord, although the messages reach the brain. (ii). The movement or growth of any part of a plant in response to an external stimulus is called tropism or tropic movements.. The shoot system of any plant responds towards the stimulus of light i.e., it grows in the direction of source of light. When a potted plant is kept near the window in a room, the stem bends slightly towards the window. This movement exhibited by the plant is called phototropic movement. 3. When light falls on a part of growing plant, a hormone called auxin which is synthesized at the tip of the shoot helps the cells to grow longer. As the light is falling on one side of the plant, this hormone auxin diffuses towards the shady side of the shoot and stimulates the cells to grow longer. 4. On the other hand, the root system of the plants responds to the stimulus of gravity and water. These responses are called gravitropic and hydrotropic movements respectively. 5. The movement of plant part in response to certain chemicals. Eg. The growth of pollen tubes towards the ovules. (iii). The symbols or molecular formulae of the reactants are written on the left hand side and products are on the right hand side.. Reactants and products are connected with an arrow ( ) pointing towards product side. 3. Whenever there are two or more reactants, a plus (+) sign is written between each of them. Similarly, if there are two or more products, a plus sign is written between them.

36 Paper - V (iv) 4. Certain reactions have to be carried out under specific condition such as temperature, pressure, catalyst. These condition are mentioned on the arrow pointing from reactants to product. 5. The physical states of reactants and products are also mentioned in a chemical equation to make it more informative. 6. The notations like g,l,s,aq are written in brackets as subscripts along with symbols/formulae of reactants and products. or (g) - Gas (l) - Liquid (s) - Solid (aq) - Aqueous solution - Precipitate. Physical change and Chemical change. Physical change. In this change, the composition of substance does not change and no new substance is formed.. There is a change only in physical properties. 3. This change is temporary. 4. The original substance can be recovered by simple means. 5. Eg.: Steam is condensed. Chemical change. In this change, the composition of substance changes and a new substance is formed.. There is a change in both physical and chemical properties. 3. This change is permanent. 4. The original substance cannot be recovered by simple means. 5. Eg.: Ripening of fruit, milk is converted to curd. A.III Draw a neat and labelled diagram of the following: (Any One) (i) Digestive glands (Liver) Liver Gall bladder Common duct

37 Paper - V (ii) Villi. Lacteal Blood (iii) Human digestive system. Oral cavity Salivary glands Oesophagus Liver Gall bladder Stomach Pancreas Large intestine Small intestine Anus

38 S.S.C. MAHESH TUTORIALS Paper - VI Test - I Batch : SB Marks : 0 Date : SCIENCE Chapter :,, 4, 6, 0, Time : hr. SECTION - A Q.I (A) Rewrite the following statements by choosing the correct option : (i) Electric current is measured with the help of a device called.... (a) an ammeter (b) a volt meter (c) a thermometer (d) a calorimeter (ii) There are... periods in the periodic table. (a) 8 (b) 8 (c) 7 (d) 9 Q.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Mendeleev (a) Octaves (ii) Dobereiner (b) Periodic law (iii) Newlands (c) Noble gas (iv) Helium (d) Triads Q.I (C) State whether the following statements are True or False : (i) The reflecting surface of a concave mirror is curved outwards. (ii) Isotopes have similar chemical properties. Q.II (A) Give scientific reasons : (Any One) (i) Connecting wires in a circuit is made of copper and aluminium. (ii) Concave mirror is called converging mirror. Q.II (B) Answer the following as required : (Any Two) (i) Solve the following numerical : An object cm high is placed at a distance of 6 cm from a concave mirror which produces a real image 3 cm high. Find the image distance. (ii) Draw a ray diagram for object between infinity and centre of curvature for a concave mirror. (iii) Explain Dobereiner s law of triads giving examples. 4

39 Paper - VI SECTION - B Q.I (A) Fill in the blanks : (i) Response to the stimulus of touch is called... whereas response to the stimulus of chemicals is called as.... (ii)... is the largest gland in the body. Q.I (B) State whether the following statements are True or False : (i) Camphor sublimes on heating. (ii) Desert plants take up carbon dioxide at night. Q.II (A) Give scientific reasons : (Any One) (i) Digestion of food starts in the mouth itself. (ii) Roots of plants go away from light. Q.II (B) Answer the following : (Any Two) (i) Write a note on Co-ordination in plants. (ii) Balance the following chemical reaction with proper symbols AgNO 3 + H S HNO 3 + Ag S (iii) What happens to the food in the large intestine? (iv) Define the following :. Combination reaction. Chemical equation. 4 Q.III (i) (ii) (iii) Draw a neat and labelled diagram of the following : (Any One) Neuron. Digestive glands (Liver). Human digestive system. Best Of Luck

40 Paper - VI S.S.C. MAHESH TUTORIALS Test - I Batch : SB Marks : 0 SCIENCE Chapter :,, 4, 6, 0, Date : MODEL ANSWER PAPER Time : hr. SECTION - A A.I (A) Rewrite the following statements by choosing the correct option : (i) Electric current is measured with the help of a device called an ammeter. (ii) There are 7 periods in the periodic table. A.I (B) Rewrite the Column II so as to match the Column I : Column I Column II (i) Mendeleev Periodic law (ii) Dobereiner Triads (iii) Newlands Octaves (iv) Helium Noble gas A.I (C) State whether the following statements are True or False : (i) False. The reflecting surface of a concave mirror is curved inwards. (ii) True. A.II (A) Give scientific reasons : (Any One) (i). Copper and aluminium are good conductors of electricity.. They have low electrical resistance. 3. As they are malleable and ductile they can be drawn into thin wires. Hence connecting wires in a circuit is made of copper or aluminium. (ii). When rays of light parallel to the principal axis are incident on concave mirror they converge.. After convergence they meet at one point on the principal axis, hence concave mirror is called converging mirror. A.II (B) Answer the following as required : (Any Two) (i) Given : Object height (h ) = cm Object distance (u) = 6 cm Image height (h ) = 3 cm

41 Paper - VI To find : Image distance (v) =? Formula : M = h h = v u Solution : h h = v u (ii) 3 = V 6 v = 6 3 v = 4 cm The image is formed at a distance of 4 cm in front of lens. A ray diagram for object between infinity and centre of curvature for a concave mirror. A B C B' F P A' Image position : Between centre of curvature and focus. Nature : Real, inverted and diminished. (iii). He arranged chemically similar elements in the increasing order of their atomic masses in a group of three which is known as Dobereiner s Triads. In a triad atomic mass of middle element is approximately equal to the mean of atomic masses of other two elements in that Triad. Eg.: Lithium (Li), Sodium (Na), Potassium (K) form a triad as they show similar chemical properties. The atomic weights are 6.9, 3, 39 respectively.

42 Paper - VI. According to Dobereiner s law of triads, = 45.9 =.95 ~ 3 = Atomic weight of sodium. Thus, the atomic weight of sodium (3) is the average of the atomic weights of lithium (7) and potassium (39). The other examples are: Elements Atomic Mass Calcium (Ca) 40. Strontium (Sr) 87.6 Barium (Ba) 37.3 Elements Atomic Mass Chlorine (Cl) 35.5 Bromine (Br) 79.9 Iodine (I) 6.9 Elements Atomic Mass Sulphur (S) 3 Selenium (Se) 79 Tellurium (Te) 8 SECTION - B A.I (A) Fill in the blanks : (i) Response to the stimulus of touch is called seismonastic movement whereas response to the stimulus of chemicals is called as chemotropism (ii) Liver is the largest gland in the body. A.I (B) State whether the following statements are True or False : (i) True. (ii) True. A.II (A) Give scientific reasons : (Any One) (i). In the mouth, the food is crushed and wetted with saliva secreted by the salivary glands so the food can smoothly pass through the soft lining of the alimentary canal.. The food that we take is of complex nature. 3. It is converted into simpler molecules with the help of biological catalysts called as enzymes.

43 Paper - VI 4. Enzyme salivary amylase breaks down starch into a simple sugar maltose. 5. Thus digestion of food starts in the mouth itself. (ii). The roots of plants respond to the stimulus of gravity and water.. These responses are called gravitropic and hydrotropic movements respectively. 3. Plants absorb water in which minerals are dissolved, from the soil with the help of their roots. 4. Therefore, roots of plants go away from light. A.II (B) Answer the following : (Any Two) (i). Plants do not have a nervous system or muscular system.. The movements exhibited by plants are mainly in response to the stimulus. 3. In certain sensitive plants like Mimosa, movement is in response to the stimulus of touch. This movement is known as seismonastic movement. There is no growth involved in this movement. 4. On the other hand, the movement of a seedling is because of growth. If growth is prevented, it does not exhibit any movement. 5. Thus, we conclude that plants exhibit two types of movement, one which is growth dependent movement and the other which is growth independent movement. (ii) AgNO 3 + H S HNO 3 + Ag S (iii). The undigested food and the residue of the digested food pass into the large intestine (about.5 m long).. This part of the intestine does not have any digestive function as the digestion is already completed. 3. The walls of the large intestine have villi which absorb most of the water and salts. 4. The rest of the material is removed from the body through the anus. Here, the exit is regulated by the muscle called sphincter. (iv). When two or more substances combine (mixture or compounds) to form a single product, then the reaction is called as combination reaction.. The representation of chemical reaction with the help of chemical formulae is a chemical equation.

44 Paper - VI A.III Draw a neat and labelled diagram of the following: (Any One) (i) Neuron. Dendrites Cyton (cell body) Nucleus Axon (ii) Digestive glands (Liver). Liver Gall bladder Common duct

45 Paper - VI (iii) Human digestive system. Oral cavity Salivary glands Oesophagus Liver Gall bladder Stomach Pancreas Large intestine Small intestine Anus