PPSC Physics Chapter 1 MECHANICS With Answers

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PPSC Physics Chapter 1 MECHANICS

Sr. # Questions Answers Choice
1 A body of mass 2 kg is suspended from the celling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be. 9.88 N 19.8 N 29.4 N 39. 2 N
2 A horizontal force of 15 N accelerates a 4 kg object rom rest along a horizontal surface at a rate of 3 m s-2 At the end of 2 s the objects momentum will be. 12 kg m s-1 24 kg m s-1 30 kg m s-1 45 kg m s-1
3 If the earth stopped rotating the weight of the object at the equator would. Be greater Be same as before Be less Very with altitude
4 What is the period of geostationary satellite. 6 hours 12 hours 18 hours 24 hours
5 The escape velocity Increases with the increase of the mass of the body Depends on the type of body used Is independent of mass of the body Decreases with the increases of the mass of the body
6 The escape velocity from the earth's surface is 1.2 km s-1 1.7 km s-1 10.2 km s-1 11.2 km s-1
7 Planets move around the sun due to. Centrifugal force Centripetal force Gravitational pull between them Frictional force between them
8 Which of the following is the magnitude of the gravitational force and is not the inherent property of the body. Mass Weight Speed Length
9 The spin angular momentum and orbital angular momentum are usually differentiated in terms of. Radius of bodies Mass of bodies Torques of bodies Momentum of bodes
10 A diver leaving the diving board makes a somer sault in the air. This is due to gravitational force The moment of inertia is decreased during the turn His moment of inertia is increased He pushes at the air for making the true
11 In planetary motion

 Angular speed remains constant Angular momentum remains constant Linear speed remains constant Linear momentum remains constant
12 An astronaut in an earth satellite will observe the sky as Light blue Deep blue White Black
13 The SI unit of angular velocity is. cm s-1 rad s-2 cm s-2 rad s-1
14 A geostationary satellite covers 100 <sup>o</sup> of longitude 120 <sup>o</sup> of longitude 130 <sup>o</sup> longitude 140 <sup>o</sup> of longitude
15 Angular moment is conserved due to Variable force Constant force Central force Uniform force
16 Which of the following pair does not have identical dimensions. Energy and torque Momentum and impulse Mass and moment of inertia Energy and work
17 When the lift is moving upward with an acceleration then weight of the object will be. w = ma w - ma w 2 w
18 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
19 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
20 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
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