PPSC Physics Chapter 1 MECHANICS With Answers

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PPSC Physics Chapter 1 MECHANICS

Sr. # Questions Answers Choice
1 If the K.E. of a body becomes four times of its initial value the new momentum will be. Half Same Four time Double
2 When the velocity of body is doubled which one is doubled too. K.E. P.E Momentum Acceleration
3 An object travels at constant speed around a circle of radius 1.0 m in 1.0 s the magnitude of its acceleration is. zero 1.0 m s-2 2 m s-2 4 pi2 m s-2
4 Which of the following statement is correct for a particle moving in a horizontal circle with constant angular velocity. The linear momentum is constant but the K.E. varies The K.E. is constant but the linear momentum varies Both K.E. and linear momentum are constant Both speed and linear velocity are constant.
5 When a force of 4 N acts on a body of mass 2 kg for a time of 2 s, the rate of change of momentum is. 2 kg ms -1 4 kg ms-1 8 kg m s-1 16 kg m s-1
6 Which of the following is not an elastic collision A man jumps on a cart A bullet embedded in a block Colliding of two glass balls Colliding of two tennis balls
7 When net torque acting on a system is zero which of the following will be constant. Force Angular momentum Linear momentum Linear impulse
8 When net force acting on a system is zero which of the following will be constant. Force Linear momentum Angular momentum Linear impulse
9 The magnitude of the resultant of two equal forces is equal to either to the force What is the angle between the two forces 0 <sup>o</sup> 120 <sup>o</sup> 60 <sup>o</sup> 180 <sup>o</sup>
10 The dimensional formula for torque is identical to. Kinetic energy Pressure energy Moment of force All of the above
11 In rotational motion, the analogue of force is. moment of inertia Moment of force Torque Rotational inertia
12 Conventionally antilock wise torque is taken as. Zero Positive Infinity Negative
13 The SI unit of torque. kg m2 kg ms-2 kg m2 s-2 kg ms -1
14 The equal and opposite forces acting on a body form Angular momentum Linear momentum Torque Couple
15 if the line of action of force passes through the axis of rotation of origin, then torque is. Maximum Negative Zero 1
16 The perpendicular distance between the line of action of forces and the axis of rotation Torque Moment arm Moment of force Momentum
17 If 'p' is the momentum of an object of mass 'm' the expression p2/m has base units identical to. Power Force Velocity Energy
18 Torque is equal to. The product of magnitude of force and acceleration The product of magnitude of force and momentum The product of magnitude of force and displacement The product of magnitude of force and angular velocity
19 A physical quantity which produces rotation in a body is called. Force Torque Momentum accelerate
20 When a body acceleatres. Its direction always chances It mass always changes It velocity always changes It falls towards the earth
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