MT - z A.P. SET CODE. Seat No.

Size: px

Start display at page:

Download "MT - z A.P. SET CODE. Seat No."

Jodie Lewis
5 years ago
Views:

1 A.P. SET CODE D MT - z Seat No MT - z - SCIENCE & TECHNOLOGY - I (7) - PRELIM - I : Set - D Time : Hours Preliminary Model Answer Paper Max. Marks : 40 A.. (A) Solve the following questions : () The orbit of a planet is an ellipse with the sun at one of the foci. () The electronic con guration of Al 3+ is (, 8). (3) False - The escape velocity is responsible to launch a rocket in space which can overcome the earth s gravitational force. Hence, its velocity should be more than the escape velocity. (4) The organic compound having double or triple bond in them is termed as unsaturated hydrocarbon. (5) Escape velocity : : : Critical velocity : or gr A.. (B) Choose and write the correct option : () (c) a few drops of water are added to quick lime () (d) c lead > c copper (3) (d) 8 (4) (d) less reactive than aluminium (5) (a) i > r but i e A.. Solve the following questions : () When potassium chromate solution is added to solution of Barium sulphate, yellow precipitate of barium chromate is form. It is a double displacement reaction. K CrO 4(aq) + BaSO 4(aq) K SO 4(aq) + BaCrO 4(s) Potassium Barium Potassium Barium chromate Sulphate sulphate chromate

2 / MT - z SET - D () (i) Copper is best suited for transmission lines. (ii) Copper has less resistivity due to large number of free electrons. Therefore the resistance of wire is less and hence a large current can ow through it easily. (3) (i) Copper on exposure to moist air combines with carbon dioxide and a green coloured copper carbonate salt is formed, tarnishing the copper. (ii) Lime juice and tamarind contain citric acid and tartaric acid respectively. (iii) These acids react with copper carbonate forming water - soluble salts, which get washed off easily. (iv) Due to this, the tarnished copper becomes clean and regains its lustre. (v) Hence, lemon or tamarind is used for cleaning copper vessels turned greenish. (4) A C B F F F F O C B A Nature of image : Real, inverted and of same size. Position of image : At F (5) Butanoic acid : Molecular formula C 4 H 8 O or CH 3 CH CH COOH Structural formula H H H O H C C C C O H H H H (6) (i) Mendeleev s Periodic law : Properties of elements are periodic function of their atomic masses. (ii) Fluorine (F).

3 3 / MT - z SET - D (7) Given : Mass (M) kg Radius (R) 0 6 m Gravitational acceleration (g) m/s To nd : V esc? Formula : V esc gr Solution : V esc gr m/s km/s The escape velocity on the planet is km/s A.3. Solve the following questions : () (i) The launch vehicle is PSLV. (ii) Liquid fuels are used in second and fourth stage. (iii) The size of the launch vehicle depends on the weight of the satellite and the type of satellite orbit. () Given: h km V 3.08 km/s M 4 M To nd: T? R 6400 km 3 Formula: V, V r T Solution: V...(i) GM n R + h G 4M R + h 4 V [from (i)] Also, r

4 r r V s Note: or ( ).7 hrs hrs 4 / MT - z SET - D The Time taken by the satellite will be hrs. (3) (i) AB and CD (ii) BC (iii) The heat energy absorbed at constant temperature during transformation of liquid into gas is called Latent heat of vapourization. (4) (i) The two main types of bonds are ionic bond and convalent bond. The compounds formed by ionic bonds are called as ionic compounds and compounds formed by covalent bonds are called covalent compounds. (ii) Carbon belongs to group 4 in modern periodic table. (iii) The electronic con guration of carbon is (, 4) and valency of carbon is 4. (5) (i) Refraction and Re ection : Refraction (i) The change in the direction of light rays while going from one transparent medium to another is called Refraction of light. (ii) The speed of light changes. (i) Re ection The bouncing back of light when it hits an opaque surface is called Re ection of light. (ii) The speed of light remains same.

5 5 / MT - z SET - D (iii) Angle of incidence is not always equal to the angle of refraction. (iv) It occurs in lenses. (iii) Angle of incidence is always equal to angle of re ection. (iv) It occurs in mirrors. (ii) (b) It is closer than least distance of distinct vision. (6) (i) It is a Polymerization reaction. The reaction by which monomer molecules are converted into a polymer is called polymerization. In the above polymerization reaction, ethylene (monomer) molecules are converted into polyethylene (polymer). (ii) The reactant is ethylene (monomer) and product is polyethylene (polymer). (iii) The uses of the product polyethylene is for making carry bags and sports wear. (7) Anode (Graphite) Steel tank Molten aluminium Cathode (Graphite lining) Mixture of alumina, cryolite and uorspar Outlet for molten aluminium (i) Cryolite (Na AlF ) and uorspar (CaF ) are added in the mixture to 3 6 lower its melting point upto 000 C. (ii) Anode reaction : O O + 4e (Oxidation) Cathode reaction : Al e Al (l) (Reduction)

wooden rif es on inclined surface. The table is kept vibrating continuously.

As a result, the lighter gangue particles are carried away along with the owing water, while the heavier particles in which proportion of minerals is more and proportion of

6 6 / MT - z SET - D A.4. Solve the following questions : () Powdered ore Water Silts Vibrating table Concentrated ore Gangue In method of separation, the Wil ey table is made by xing narrow and thin wooden rif es on inclined surface. The table is kept vibrating continuously. Powdered ore obtained from lumps of the ore using ball mill is poured on the table, a stream of water is also released from the upper side. As a result, the lighter gangue particles are carried away along with the owing water, while the heavier particles in which proportion of minerals is more and proportion of gangue is less, are blocked by the wooden rif es and get collected on the slits between them. () (i) () Kepler s rst law : The orbit of a planet is an ellipse with the Sun at one of the foci. () Kepler s second law : The line joining the planet and the Sun sweeps equal areas in equal intervals of time. (3) Kepler s third law: The square of its period of revolution around the Sun is directly proportional to the cube of the mean distance of a planet from the Sun. 3

7 7 / MT - z SET - D (ii) Complete the following for an object of mass m On Earth s surface At in nity (A) KE (B) PE mv (A) KE 0 GMm R (B) PE 0

Activity Sheet 2 : Sample Answer Paper

Activity Sheet 2 : Sample Answer Paper Time : 2 Hrs Science and Technology Part Marks : 40 Q. A) Solve the following questions. 05 i) Goa beach. ii) Iron (Fe) undergoes oxidation and Sulphur (S) undergoes