## Physics (Objective) (Pages :44) <<< Back

• 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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