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Chapter 3: Work and Energy

60 Questions 60 Minutes Pass: 60%
1 Work is done when a force produce ______
2 Work done is equal to the product of the component of force in the direction of displacement and the magnitude of ______
3 The dot product between force and displacement is called ______
4 The mathematical form of work is ______
5 When force is in same direction of the displacement the work is ______
6 When the direction of force is opposite to the direction of the displacement, the work is ______
7 When force is perpendicular to displacement, the work is ______
8 The S.I. unit of work is ______
9 The dimensions of work are ______
10 Work is a ______
11 The region around the earth within which a body experiences force of attraction is called ______
12 If F = i + j - k and r = 2i + j + k then work is ______
13 A man pulls trolly through a distance of 100m by applying a force of 50N which makes 60° with the horizontal. The work of the man is ______
14 The field in which work done between two points is independent of the path followed by the body is called ______
15 The amount of work done when a force of 1N acting on a body displaces it through a distance of 1m in the direction of force is called ______
16 The work done by moving a body from one place to another under action of gravity ______ of the path followed ______
17 The total work done in moving a body along a closed path in a gravitational field is always equal to
18 Complete the equation W = Fd ___
19 The work done against the gravitational field is given by
20 A girl of mass 10 kg runs up a flight of stairs to a floor which is at a height of 10m. The work done by the girls against gravity is
21 The unit of energy in terms of power is
22 1 KWh = ___
23 Work is also defined as
24 An electric motor can lift a weight of 2000 N through a height of 10m in 20S what is the power of the motor
25 A body of mass 50 kg runs up to a floor which is at a height of 10m in 9.8sec. What is the average power developed by the body.
26 The ability to do ___ is called energy
27 1M watt = ___ watt
28 1 G watt = ___ watt
29 The S.I. unit of energy is
30 There are two categories of mechanical energy
31 The unit of energy in terms of power is
32 1 KWh = ___
33 Work is also defined as
34 An electric motor can lift a weight of 2000 N through a height of 10m in 20S what is the power of the motor
35 A body of mass 50 kg runs up to a floor which is at a height of 10m in 98sec. What is the average power developed by the body.
36 The ability to do ______ is called energy
37 1M watt = ______ watt
38 1 G watt = ______ watt
39 The S.I. unit of energy is
40 There are two categories of mechanical energy
41 The energy which a body posses due to its motion is called
42 A car moving along the highway has ______
43 A rotating machine has ______
44 The K.E of a body moving with velocity v is given by eq.
45 The dimensions of energy are
46 According to work - energy principles "work done on a body is equal to the change in ______"
47 The energy possessed by a body due to change of its position in a field of force is
48 The energy possessed by a body due to change of its position against the gravitational field is called
49 The gravitational P.E is given by equation
50 The amount of work is required in lifting a body from a point to infinity against the gravitational field is known as ______
51 The absolute potential energy is given by equation
52 Kilo watt hour (kwh) is the unit of
53 1 electron volt (tev) equal to
54 Which of the following is the main source of solar energy
55 A tennis ball is dropped onto a hard smooth horizontal surface. The ball bounces up and down through the air. The weight of bounces gradually decreases unit the ball stop moving
56 A body pushes a toy cart along a level road and then lets it go. As the cart is slowing down, the biggest energy charge is from
57 A stone of mass 1 kg is thrown to a height of 2m. what is the change in its gravitational potential energy
58 An electron motor is used to lift 4 N land through 5 m. The total amount of energy (electrical) used by the motor is 30J. What amount of energy is wasted by the motor.
59 The velocity which should be given to a body to enable it to escape from the surface of earth is called
60 According work-energy equation loss of P.E = Gain of --- +N