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 Physics Questions

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Q:

What is the SI unit of Torque?

A) newton/meter B) newton meter
C) newton second D) newton/meter squared
 
Answer & Explanation Answer: B) newton meter

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Q:

The value of acceleration due to gravity (g) at a distance of 2R from the surface of earth, where R is the radius of earth is ______.

A) g/3 B) g/4
C) g/9 D) g/2
 
Answer & Explanation Answer: C) g/9

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Q:

An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is

A) 20 J B) 25 J
C) 10 J D) 40 J
 
Answer & Explanation Answer: A) 20 J

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Q:

A person lifts luggage of 20 kg from the ground and puts it on his head 2 in above the ground. Calculate the work done by him. (g = l0 )

A) 20 J B) 400J
C) 200J D) 40J
 
Answer & Explanation Answer: B) 400J

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Q:

A particle is thrown vertically upward. When it reaches the highest point, it has ____________

A) a downward acceleration B) an upward acceleration
C) a downward velocity D) a horizontal velocity
 
Answer & Explanation Answer: A) a downward acceleration

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Q:

When an unbalanced force acts on an object

A) causes change in motion of the object B) the speed & direction of the object will change
C) causes the object to move D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Unbalanced forces are the forces which causes change in motion of the object. It sets the object in motion and may cause the object to move. If the object is already in motion, it changes the speed and direction of the object.

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Q:

The reflector of a search light is a :

A) Convex mirror B) Concave mirror
C) Plane mirror D) Cylindrical mirror
 
Answer & Explanation Answer: B) Concave mirror

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Q:

In a _________ the wave particles of the medium vibrate in a direction perpendicular to the direction of wave propagation

A) longitudinal B) rolling
C) transverse D) field
 
Answer & Explanation Answer: C) transverse

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