1. Work done upon a body a
(a) A vector quantity
(b) A scalar quantity
(c) Always positive
(d) Always negative
2. In the SI system, the unit of PE. Is
(a) Erg
(b) Dyne-cm
(c) J
(d) None of these
3. Kilowatt hour (kWh) represents the unit of
(a) Power
(b) Impulse
(c) Momentum
(d) None of these
4. Two unequal masses possess the same momentum, the kinetic energy of the heavier mass is ------ the kinetic energy of the lighter mass.
(a) Same as
(b) Greater than
(c) Greater than
(d) Much greater than
5. A truck and a car are moving on a smooth, level is same. Brakes are applied to both of them simultaneously. Which one will cover a greater distance before it stops?
(a) Car
(b) Truck
(c) Both will cover the same distance
(c) Nothing can be decided
6. Two spherical balls of the same radius but of different masses, are propped at the same time from the top of a tower 19.6 m high. When they are 1.6 m above the ground, the balls will possess the same.
(a) K.E.
(b) P.E.
(c) Momentum
(d) Total energy
7. A photocell converts light energy into
(a) Chemical energy
(b) Electrical energy
(c) Heat energy
(d) Mechanical energy
8. Watt sec represents the unit for
(a) Energy
(b) Power
(c) Force
(d) None of these
9. A flying aeroplane has
(a) Only potential energy
(b) Only kinetic energy
(c) Both potential and kinetic energy
(d) None of these
10. Steam engine converts
(a) Heat energy into sound energy
(b) Heat energy into mechanical energy
(c) Mechanical energy into heat energy
(d) Electrical energy into sound energy
11. A body at rest can have
(a) Speed
(b) Energy
(c) Momentum
(d) Velocity
12. The flowing water of a river possesses -------- energy.
(a) Gravitational
(b) Potential
(c) Electrical
(d) Kinetic
13. A bird flying in the sky has
(a) K.E. only
(b) P.E. only
(c) Neither K.E. nor P.E.
(d) Both K.E. and P.E.
14. A body rolling down a hill has
(a) K.E. only
(b) P.E. only
(c) Neither K.E. nor P.E.
(d) Both K.E. nor P.E.
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