PPSC Physics Chapter 1 MECHANICS With Answers

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PPSC Physics Chapter 1 MECHANICS

Sr. # Questions Answers Choice
1 A force of 50 N acts on a body for 10 s What will be change in momentum. 5 Ns 500 Ns 200 Ns 800 N s
2 The rate of change of momentum of a body falling under gravity is equal to its. P.E. K.E Weight Density
3 A rocket propulsion is based on the principle of. Conservation of momentum Conservation of mass Conservation of energy Floatation
4 The period of a geostationary satellite is. 32 hours 72 hours 48 hours 96 hours
5 The escape velocity Is independent of mas of the body Increases with the increases of mass of the body Decreases with the decreases of mass of the body Depends upon the type of body used
6 The term radius of gyration relates to. Moment of force Moment of inertia Law of gravitation simple harmonic motion
7 The force of gravity between two objects does not depend upon the. Constant of gravitation Separation Product of their masses Sum of their masses
8 If the earth stopped rotating the weight of objects at either pole would. Be grater Be less Vary with altitude Be the same before
9 Where should be the centre of gravity of a body. It must be within the body It must be outside the body It may be near but not essentially within the body It changes its position after sometime
10 Which of the following quantity is zero about the centre of mass of baody. Mass Acceleration Moment Angular momentum
11 The working of the rocket is based on the principle of. Electromagnetism Conservation of momentum Floatation Hydraulic system
12 A bomb dropped from an aeroplane explodes in air, its total. Momentum decreases Momentum increases K.E. Increases K.E. Decreases
13 If a car is to gain momentum it must. Lose inertia accelerate Move rapidly Lose weight
14 The SI unit of impulse is. N m N s Kg ms -1 Both b and c
15 In any collision between two bodies there need nor the conservation of Linear momentum Angular momentum Total energy Kinetic energy
16 The product of force and duration of impact is called. Density Momentum Torque Impulse
17 Rate of change of momentum is called. Torque Force Impulse Inertia
18 In an elastic collision K.E. is conserved Both K.E. and momentum are conserved K.E. is not conserved Only momentum is conserved
19 The moment of linear momentum is called. Torque Couple Impulse Angular momentum
20 Impulse is equal to. F x t/2 \F x t /4 F x t F x t /m
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