Physics Questions

Q:

Which is the form of energy that does NOT occur while riding a bicycle?

A) Heat energy B) Kinetic energy
C) Chemical energy D) Mechanical energy
 
Answer & Explanation Answer: C) Chemical energy

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Q:

The instrument used to determine the rotation speed of a shaft is called

A) Speedometer B) Tachometer
C) Anemometer D) Chronometer
 
Answer & Explanation Answer: B) Tachometer

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Q:

A force of 20 N displaces an object through 2 m and does a work of 20 J. The angle between the force and displacement is

A) 60 deg B) 0 deg
C) 90 deg D) 30 deg
 
Answer & Explanation Answer: A) 60 deg

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Q:

Find the acceleration (in m/s2) produced in a body of mass 4 kg when a force of 24 N is applied on it.

A) 96 B) 6
C) 12 D) 48
 
Answer & Explanation Answer: B) 6

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Q:

What will be the value of the kinetic energy (Ek) of a moving body with mass m, if its speed is doubled from v to 2v?

A) 1/2 Ek B) 4 Ek
C) There will be no change in Ek D) 2 Ek
 
Answer & Explanation Answer: B) 4 Ek

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Q:

Find the potential energy gained by a body of mass 25 kg, if it is raised by 5 m. (use g = 10 m/s2)

A) 1250 B) 50
C) 625 D) 25
 
Answer & Explanation Answer: A) 1250

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Q:

What is the duration of the world’s shortest X–ray laser has been successfully created by the scientists?

 

A) 39 nanoseconds B) 43 attoseconds
C) 15 picoseconds D) 57 microseconds
 
Answer & Explanation Answer: B) 43 attoseconds

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Q:

A ball of 0.1 kg is dropped from rest. When it falls through a distance of 2 m, the work done by the force of gravity is

A) 0.98 J B) -0.98 J
C) 1.96 J D) -1.96 J
 
Answer & Explanation Answer: C) 1.96 J

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