Angel International School -Manipay 2 nd Term Examination April, 2015 Science

Transcription

1 c Grade 10 Angel International School -Manipay 2 nd Term Examination April, 2015 Science Duration: 2.5 Hours PART I Index No:- 1) To which group of organisms does Yeast belong? a) Bactria c) Algae b) Fungi d) Protozoa 2) Select the plant that is not photoautotrophic a) Acalypha c) Loranthus b) Asparagus d) Cuscuta 3) Which organ does not act as an excretory organ? a) Kidney c) Stomach b) Skin d) Lungs 4) Select the most appropriate term to define a stimulus a) Maintenance of a constant internal environment b) A change takes place in internal and external environment c) A change in the external and internal environment that is strong enough to bring about a response d) Co-ordination between different organs during responding 5) Few statements about viruses are given below A virus is a species of organism B virus possess DNA or RNA C virus multiply only within living cells Correct statements are, a) A & B b) B & C c) C & A d) All the above 6) What is the process that produces energy for cells?

2 a) Nutrition b) Reproduction c) Excretion d) Respiration 7) Select the correct term for the gap. Cell->tissue-> ->system a) Organism b) Organ c) Organelle d) Structure 8) A carbohydrate specially found in plants is a) Glycogen c) Pectin b) Lactose d) cellulose 9) The food that contains highest amount of starch is a) Potato c) Cucumber b) Peanut d) Gotukola 10)Which belongs to monosaccharide? a) Fructose b) Sucrose c) Maltose d) Lactose 11)What is the term used to explain all the biochemical reactions take place in living body? a) Metabolism b) Coordination 12)A vitamin that helps in blood clotting is c) Respiration d) Growth a) Vitamin A b) Vitamin D 13)Not an organic compound present in living body. c) Vitamin C d) Vitamin K a) Proteins b) Water c) Carbohydrates d) Lipids 14)Which is true about cell? a) All organisms are made up of one or more cells b) It is the structural and functional unit of life c) New cells formed from pre-existing cells

3 d) All the above 15)What is the shape of rough endoplasmic reticulum? a) Tubular shape b) Round shape 16)Which is scalar quantity? c) Flat shape d) None of the above a) Length b) Acceleration c) Velocity d) Weight 17)What is the main condition for the object to be in equilibrium? a) The resultant force should be a larger force b) The resultant force is zero c) The resultant force must have less force d) All the above 18) An object on a horizontal plane is pulled along a certain direction with a force of 20 N. In order to bring the object to rest, what is the force that should be applied on it in the direction opposite to the 20 N force? a) 20 N b) 40 N 19)Moment of couple of forces is given by c) 25 N d) 0 N a) Force/perpendicular distance b) Force x perpendicular distance c) Force / velocity d) Force x velocity 20) Find the resultant force? a) 100 N b) 250 N c) 350 N d) 150 N 100 N 250 N 21) What is the magnitude and the direction of the resultant of a force of 5 N pulling an object placed on a table in a certain direction and another force of 2 N pulling it in the opposite direction? a) 7 N in the direction of 2 N force b) 7 N in the direction of 5 N force c) 3 N in the direction of 2 N force d) 3 N in the direction of 5 N force

4 22) The frictional force exerted on the body before the motion starts is known as a) Limiting friction b) Static friction 23) Which is true about the limiting friction? c) Dynamic friction d) None of the above a) It depends on surface area of the contact surface b) Depends on the nature of the contact surfaces c) Only b d) Both a and b 24) A bullet of mass 10 g fired by a gun moves at a velocity of 400 m/s.find its momentum? a) 4000 kg m/s b) 4 kg m/s 25) Formula for weight is a) Mass x velocity b) Mass x acceleration 26) Force is a a) Scalar b) Vector 27) Negative acceleration is known as c) kg m/s d) 40 kg m/s c) Mass x distance d) None of the above c) All the above d) None of the above a) Deceleration b) Retardation c) Both a and b d) Only a 28) Displacement of a body moving at a constant velocity can be calculated from its a) Velocity x time b) Mean velocity x time c) Change in velocity /time d) Velocity/time 29) An atom of an element consists of 19 protons, 19 electrons and 18 neutrons. The mass number of this atom is a) 19 b) 37 c) 18 d) 1 30) The mass number of an element is 14 and its atomic number is 6.This atom contains electrons a) 14 b) 6 c) 8 d) 20 31) The sum of the number of protons and the number of neutrons in the nucleus of an atom is known as its a) Atomic number b) Mass number

5 c) Nucleus d) Isotopes 32)The electro negativity of an elements a) Increases across a period and increases down the group b) Increases across a period and decreases down the group c) decreases across a period and decreases down the group d) decreases across a period and increases down the group 33) Who presented the planetary model for the atom? a) Neils Bohr b) Dmitri Mendeleeff 34) The value of atomic mass unit is c) Ernest Rutherford d) None of the above a) 1.67 x g b) 1.67 x g c) 1.67 x g d) 1.67 x g 35) Calculate the relative formula mass of calcium carbonate (CaCO 3 ) Provided R.A.M of C-12,Ca-40,O-16 a) 68 b) 40 c) 100 d) 58 36) The symbol of Avogadro constant is a) A b) Z 37) Find the number of atoms in 4 mole of carbon c) L d) M a) x c) x b) 4 x d) x ) Find out which is not an example of ionic compound? a) Copper sulphate b) Ammonium nitrate 39) Which is true about properties of water molecule? c) Hydrogen chloride d) Magnesium sulphide a) High boiling point b) High specific heat capacity c) High density d) All the above 40) The bonds formed by sharing of electrons between pairs of atoms is a) Ionic bonds b) Covalent bonds c) Metallic bonds d) Bonding

6 Part II Structured essay: BIOLOGY 1) a) Label the parts in the below diagram A B C D E F G H I J K L b) Name the above cell 1 and cell 2

7 2)a) What is the name of the above experiment? What is the main purpose of the above experiment? 2)b) Name the above organism and explain its reproduction process inside the host cell Explain why the above organism is considered as living and nonliving?

8 CHEMISTRY (10 x 1 =10 marks) 1) A part of the periodic table is shown below. The symbols given in it are not trues symbols of the respective elements. Answer the questions below that are based on them. A X Z Y E R a) Identify the element/elements that behave as a noble gas. b) Mass number of Y is 35.Find the number of protons and neutrons in an atom of Y. c) Write the electronic configuration of R. d) How many valencies are shown by A? e) A compound is formed by the reaction between A and Y. Write the probable formula of this compound. _ 2) Draw the dot and cross diagrams of the following molecules. a) Chlorine

9 b) Oxygen c) Water d) Methane e) Ammonia (10 x 1 =10 marks) PHYSICS

10 1) The velocity time graph of an object moving along a straight line is shown in figure below. a) Find the acceleration during the first 6 s. b) What is the displacement during these 6 s? _ c) What is the distance travelled under the uniform velocity? _ d) What is the deceleration during the last 3 s? _ e) What is the distance travelled during the last 3 s? _ 2) a) What can you say about the nature of the motion of an object on a horizontal table that is pulled in opposite directions with two unequal forces? _

11 b) Calculate the resultant force for the following problems 150 N 80 N c)define Newton s third law Essay question: BIOLOGY 1) State three specific features of water.explain one briefly mentioning how it helps in continuation of life. 2) Mention the function of the following organelles a) Vacuole b) Golgi complex c) Mitochondrian

12 3) Define inhalation and exhalation OR 1) a) List the common characteristics of living organisms. b) Define autotrophic and heterotrophic c) Explain the equation of photosynthesis CHEMISTRY 1) What is meant by a covalent bond?

13 2) Write the electronic configurations of the following ions and illustrate them by diagrams. a) Na + b)mg 2+ c)o 2- d)n 3-3) Find the relative molecular mass of the following substances. i) CH 3 OH (Methyl alcohol/methanol) ii) C 8 H 18 (Octane)

14 iii) CH 3 COOH (Acetic acid) iv) C 8 H 9 NO 2 (Paracetamol) v) C 12 H 22 O 11 (Sucrose) (R.A.M: H-1, C-12, N-14, O-16, S-32, Cl-35.5) (Or) 1) Find the molar mass of the following compounds. i) NH 4 Cl (Ammonium chloride) ii) Mg 3 N 2 (Magnesium nitride) iii) (NH 4 ) 2 CO 3 (Ammonium carbonate)

15 iv) H 2 S (Hydrogen sulphide) v) Na 2 C 2 O 4 (Sodium oxalate) (R.A.M: H-1, C-12, N-14, O-16, Na-23, Mg-24, Al-27, S-32, Cl-35.5, Ca-40, Cu- 63.5) 2) D, E, G, J, L, M, Q, R and T are nine consecutive elements in the Periodic Table R is a noble gas belonging to Period 3. i) Of these elements, identify the two elements belonging to the same Group. ii) To which Group of the Periodic Tale do those element belong? iii) Of the above, name the element of highest electronegativity? iv) Write the formula of the compound formed by the reaction between E and M. v) Of the above, name the element with highest first ionization energy.

16 Physics 1) A fruit in a tree detaches from the stalk takes 4 s to fall to the ground a) What is the velocity when it reaches the ground? b) What is the height that it fell from? ii) An object is projected vertically upwards at an initial velocity of 30 m/s? a) Find the time taken by the object to reach its maximum height. b) What is the maximum height reached by the object? c) Sketch the v-t graph for the motion of the object from the time it was projected until it reaches the maximum height. 2) When an object is held by a newton balance, the reading was 80 N.If another object of mass 500 g was attached to Newton balance, What would be the resultant force in Newtons?

17 OR 1) a) The mass of an object is 60 kg.what is its weight? b) If the gravitational acceleration on the moon is 1/6 th that of the earth,what would be the weight of the above object on the moon? 2) If the acceleration of 2 m/s 2 results when a force of 8 N is applied on a certain object, find the mass of the object. 3) a) Briefly state what is meant by friction. b) What are the two factors that limiting friction depends on? ****