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Physics (Objective) (Pages :44)
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31 Unit of power is?

Ans : Watt or joule/sec
32 Power is a?

Ans : scalar quantity
33 Power is Measured in?

Ans : Horse power [1 Horse power =746 watt]
34 The capacity to do a work is called?

Ans : Energy
35 Unit of energy is?

Ans : Joule
36 The energy developed on a body when a work done on that?

Ans : Mechanical energy
37 Two types of Mechanical energy are -?

Ans : Kinetic energy and Potential energy
38 Energy possessed by a body due to its motion is called?

Ans : Kinetic Energy
39 If velocity is doubled, kinetic energy become?

Ans : Four times
40 If the mass of a moving body is doubled, its kinetic energy is?

Ans : Doubled
41 Energy possessed by a body, by virtue of its position is called?

Ans : Potential Energy [PE = mgh ] [m=mass; g = acceleration due to gravity; h = height]
42 Energy stored in a compressed string is?

Ans : Potential Energy
43 Energy stored in a water reservoir is?

Ans : Potential Energy
44 Potential energy of an object at a ground level is?

Ans : Zero
45 Potential energy increases as the height?

Ans : Increases
46 When a free falling object approaches the earth, its potential energy?

Ans : Decreases
47 Law of Conservation of Energy is put forward by?

Ans : Albert Einstein (E =mc2 (m = mass; C = Velocity of light)
48 Einstein proposed the Special Theory of Relativity in?

Ans : 1905
49 Einstein proposed the General Theory of Relativity in?

Ans : 1915
50 The change in posltion of an object over time is called?

Ans : Motion
51 Actual length travelled by a body is called?

Ans : Distance
52 Shortest distance from the initial to the final position of a body is called?

Ans : Displacement.
53 The study of particles or bodies when they are at rest or in motion is dealt with?

Ans : Mechanics
54 Mechanics is divided into two, they are?

Ans : Statics & Dynamics
55 The study of objects of-rest is called?

Ans : Statics
56 The study of moving objects is called?

Ans : Dynamics
57 The product of mass and velocity of a body?

Ans : Momentum [P= mv [m=Mass; v=velocity]
58 Unit of Momentum is?

Ans : kg m/s
59 A Karate player in order to break a brick hits quickly because of?

Ans : Momentum
60 Issac Newton propounded his law of motion is his book?

Ans : Principia Mathematica

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