Class 9 Physics Chapter 6 MCQs Federal Board
Class 9 Physics Chapter 6 MCQs Federal Board
Tick the correct option.
1) The unit of work or energy joule(J) is equal to:
A) horsepower
B) watt metre
C) watt second
D) newton second
Correct option is (c)
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2) A car, an elephant and a cricket ball have same kinetic energies. Which of these will have a greater speed?
A) Car
B) Elephant
C) Cricket ball
D) all have same speed
Correct option is (c)
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3) A ball weighing 50 N is lifted to a height of 0.5 metre. The potential energy stored in it is:
A) 10 J
B) 25 J
C) 45 J
D) 55 J
Correct option is (b)
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4) What is the power utilized when 100 J of work is done in 5 s.
A) 10 W
B) 20 W
C) 105 W
D) 500 W
Correct option is (b)
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5) The SI unit of power is:
A) joule
B) watt
C) horsepower
D) erg
Correct option is (b)
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6) A 4 kg body is thrown vertically upward from the ground with a velocity of 5 m/s. If friction is neglected its kinetic energy just before hitting the ground is:
A) 25 J
B) 50 J
C) 75 J
D) 100 J
Correct option is (b)
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7) A ball is thrown downward with an initial velocity, its:
$$a)\;E_k\;increases\;\&\;E_p\;decreases\\b)\;E_k\;decreases\;\&\;E_p\;increases\\c)\;Both\;E_k\;\&\;E_p\;increases\\d)\;Both\;E_k\;\&\;E_p\;decreases$$
Correct option is (a)
8) The type of energy derived from heated ground water is:
A) tidal energy
B) geothermal energy
C) hydroelectric energy
D) nuclear energy
Correct option is (b)
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9) A weight lifter of power 1960 watt lifts a load of mass ‘M’ from the ground to a higher of 2 m in 3 second. ‘M’ is:
A) 100 kg
B) 200 kg
C) 300 kg
D) 400 kg
Correct option is (c)
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10) Which one is renewable source of:
A) Coal
B) Natural gas
C) Sunlight
D) Uranium
Correct option is (c)
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11) One unit of horsepower is equivalent to:
A) 756 watt
B) 716 watt
C) 736 watt
D) 746 watt
Correct option is (d)
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12) A practical engine cannot have an efficiency equal or greater than:
A) 0
B) 0.5
C) 0.8
D) 1
Correct option is (d)
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13) A heavy and a lighter object have some momenta. The object with greater kinetic energy is:
A) lighter
B) heavy
C) same kinetic energy
D) either a or b
Correct option is (a)
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14) A force is acting on body but causes no displacement. The work done on the body is:
A) positive
B) negative
C) zero
D) infinite
Correct option is (c)
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15) A box taken to the second floor of a building by doing some work. This work converts to:
A) kinetic energy
B) potential energy
C) heat energy
D) sound energy
Correct option is (b)
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