Power and Energy Quiz | Power and Energy Objective Type Questions & Answers

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Questions
21 On an object the work done does not depend upon:
A Displacement
B Angle between force and displacement
C Force applied
D Initial velocity of an object

Answer: Initial velocity of an object
22 A radio set of 60 watts runs for 50 hours. How many units of electrical energy are consumed in kWh?
A 2 kWh
B 3 kWh
C 4 kWh
D 2.5 kWh

Answer: 3 kWh
23 In 1 minute how much energy does a 100 W electric bulb transfers?
A 100 J
B 600 J
C 3600 J
D 6000 J

Answer: 6000 J
24 The commercial unit of Energy is:
A Watt
B Watt-hour
C Kilowatt-hour
D Kilowatt

Answer: Kilowatt-hour
25 The energy possessed by a body due to its position is called:
A Kinetic Energy
B Potential Energy
C Mechanical Energy
D Electrical Energy

Answer: Potential Energy
26 What happens to its potential energy when an object is taken to high altitude?
A Its potential energy increases
B Its potential energy decreases
C Its potential energy remain same
D None of the above

Answer: Its potential energy increases
27 What is the unit of energy in SI system?
A Joule
B erg
C Watt
D Newton

Answer: Joule
28 What is the unit of energy in c.g.s system?
A dyne
B erg
C newton-meter/second
D dyne-cm/second

Answer: erg
29 The rate of change of work is _______ .
A Power
B Force
C Momentum
D Energy

Answer: Power
30 What is the unit of power?
A Watt
B Newton
C Joule
D Newton-meter

Answer: Watt
31 1 Horse Power (HP) = _________ Watt.
A 446
B 766
C 746
D 674

Answer: 746
32 Which of the following is true?
A Power = work done × time
B Power = work done/time
C Power = work done × velocity
D Power = work done/ velocity

Answer: Power = work done/time
33 Which of the following is equal with Newton-meter?
A Joule
B Horse Power
C Watt
D Pascal

Answer: Joule
34 Due to application of 5 N force an object moves 10 meter along perpendicular direction of the force. What amount work is done?
A 50 Joule
B 15 Joule
C 5 Joule
D 0 Joule

Answer: 0 Joule
35 Joule/second is related to –
A Watt
B Newton
C Pascal
D Torr

Answer: Watt
36 What is the formula of potential energy?
A mv2
B mgh
C mgh2
D ρgh

Answer: mgh
37 What is the formula of kinetic energy?
A (1/2)mv2
B mv2
C mgh
D p∫dv

Answer: (1/2)mv2
38 A dog weighing 25 kg, while chasing a cat, jumps over a fence of height 1.6 m. What is the potential energy of dog at the top of fence ?
A 160 Joules
B 320 Joules
C 380 Joules
D 480 Joules

Answer: 380 Joules
39 A soldier makes a swing jump between two points, by holding one end of a rope, other end of which is tied to some higher point. Work done by rope in jumping of soldier from one point to another is an example of :
A Negative work
B Positive work
C Zero work done
D None of the above

Answer: Zero work done
40 The value of 1 Kilo Watt Hour is
A 1.8 X 105J
B 3.6 X 106J
C 5.4 X 108J
D 7.2 X 1010J

Answer: 3.6 X 106J

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