Physics 11th Chapter 5 MCQs
Physics 11th Chapter 5 MCQs. Class 11th Physics federal board notes.
Tick the correct option.
1) If the unit of force and displacement travelled each be increased five times, Then the unit of work will be increased by:
A) 25 times
B) 10 times
C) 5 times
D) 0 times
Correct option is (a)
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2) The force that acts on a body but does no work is:
A) gravitational force
B) fictional force
C) elastic force
D) centripetal force
Correct option is (d)
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3) The odd force from the following is:
A) gravitational force
B) elastic force
C) frictional force
D) electric force
Correct option is (b)
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4) The work done by a body while covering a vertical height of 10 is 500 J. By how much amount does the energy of the body change?
A) 500 J
B) -500 J
C) 50 J
D) -50 J
Correct option is (a)
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5) Two objects, A and B, have the same mass. Object A is moving at twice the speed of object B. The kinetic energy of object A as compared to object B is:
$$A)\;K.E_A\;=\;4\;K.E_{B.}\\B)\;K.E_A\;=\;2\;K.E_B\\C)\;K.E_A\;=\;K.E_B\\D)\;K.E_A\;=\;\frac12\;K.E_B$$
Correct answer is (a)
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6) If velocity of a body reduces to half of its initial value, then the kinetic energy of the body compared to its initial value is:
A) one furth
B) double
C) four times
D) half
Correct option is (a)
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7) A moving hockey ball is hit, such that its speed doubles. Its Kinetic energy will become:
A) double
B) quadrupled
C) halve
D) zero
Correct option is (b)
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8) An engine converts 600 J of input energy into 150 J of useful work. The efficiency of the engine is:
A) 25 %
B) 50 %
C) 75 %
D) 100 %
Correct option is (a)
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9) Two engines, A and B, are rated for the same power output. Engine A has a higher efficiency than engine B. What can you conclude?
A) Engine A requires less fuel to produce the same power.
B) Engine A is physically larger and heavier than engine B.
C) Engine B produces more waste heat than engine A.
D) The efficiency rating is unrelated to fuel consumption.
Correct option is (a)
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10) Consider two machines, A and B. Machine A has an efficiency of 40% and Machine B has an efficiency of 60%. If both machines are provided with 500 J of energy, how much more useful work does Machine B perform compared to Machine A?
A) 50 J
B) 100 J
C) 200 J
D) 300 J
Correct option is (b)
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11) A wind turbine converts 30% of the wind’s kinetic energy into electrical energy. If the kinetic energy of the wind is 900 J. The electrical energy produced by the turbine is:
A) 90 J
B) 270 J
C) 600 J
D) 700 J
Correct option is (b)
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