PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 If a gymnast sitting on a rotating stool with his arms out stretched lowers his arms. The angular speed increases The angular speed decreased The angular speed becomes zero The angular speed becomes constant
2 On the ground the gravitational force on a satellite is W What is the gravitational force on the satellite when at height R/50 0.96 W 0.98 W 1.04 W 1.02 W
3 A 10 kg rocket fragment falling towards the earth has a net downward acceleration of 5 ms -2 The net downward force acting on the fragment is 5 N 10 N 50 N 105 N
4 The gravitational strength on the surface of moon is 1.6 N kg-1 What will be the mass and weight of an object respectively on the surface of the moon. 10 kg , 1.6 N 10 Kg , 16 N 16 Kg, 10 N 16 kg, 160 N
5 A body of mass 8 kg moves along a circle of radius 4 m with constant speed of 88 m s-1 The centripetal force on the body is. 10 N 128 N 48 N 148 N
6 A man in an elevator ascending with an acceleration will feel that his weight. Has increased Has decreased Remains the same Vanishes
7 If the roads are not banked A vehicle will turn over A vehicle will not travel along with curve Tyres and bearing are damaged Roads will be spoiled
8 The minimum velocity needed to put a satellite into the orbit Terminal velocity Escape velocity Critical velocity Linear velocity
9 Linear acceleration of a point moving in a circle of radius 30 cm with angular acceleration of 0.5 rad s-2 is 1.5 cm s-2 2.5 cm s-2 10 cm s-1 15 cm s-2
10 The angular momentum of a body about a fixed point is conserved if its velocity Decreases Increases Remain the same Becomes zero
11 The diver spins faster when moment of inertia becomes Smaller Greater Double zero
12 In rotational motion the quantity which plays the same role as the inertial mass in rectilinear motion. Angular momentum Linear momentum Moment of inertia Torque
13 The SI unit of angular momentum is. kg m-1 s kg m2 s kg m s-1 kg m2 s-1
14 The angle subtended at the centre of a circle by an arc equal to its radius is equal to. One rotation One radian One degree One revolution
15 Kinetic and potential energies are Not inter convertible Inter convertible Two forms of torque Not related with each other
16 the consumption of energy by a 60 watt bulb in 2 s is 0.02 J 30 J 120 J 60 J
17 Work has the same dimensions as that of Power Liner momentum Angular momentum Torque
18 A body of mass 3 kg lies on the surface of the table 2 m high it is moved on the surface 4 m the change in P.E. will be. 9.8 J 6 J Zero 329 J
19 When speed of a moving body becomes double. Its K.E. is doubled Its acceleration is doubled Its P.E. is doubled Its momentum is double
20 The consumption of energy by a 60 W bulb in 2 s is 0.02 J 30 J 60 J 120 J
21 If an athlete uses 50 J of energy to lift a load in 2 s his muscular power is. 125 W 250 W 500 W 1,000 W
22 If velocity is doubled then Momentum increase 4 time and K.E. increase 2 times Momentum increases 2 times and K.E. remains constant Momentum increases 2 times and K.E. increases 4 times Both momentum and K.E. remain constant
23 The unit of energy are the same as that of Force Power Work Efficiency
24 The relation between horse power and watt is. 1 hp = 546 watts 1 hp = 746 watts 1 hp = 946 watts 1 hp = 1000 watts
25 A field in which the work done in moving a body along the closed path is zero. electric field electromagnetic field Conservative field Non conservative field
26 Ethanol is a replacement of Gasoline oil Kerosene oil Refinery oil vegetable oil
27 The process of getting energy by direct combusting method from the waste products is commonly known as. Solid waste Depletion region Green house Fregmentation
28 Solar cells are thin wafers made from Uranium Nickel Silicon Cadmium
29 The centre of the sun produces a large amount of energy what is the source of this energy. Chemical reaction Nuclear fission Nuclear fusion Radioactive decay
30 Which example best illustrates the conservation of electrical energy to chemical energy. Starting a car Generating hydroelectric power Changing an accumulator Melting a fuse
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