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Q:

A body in equilibrium _______.

A) can move with constant acceleration B) is always at rest
C) can move with constant velocity D) can move with variable acceleration
 
Answer & Explanation Answer: C) can move with constant velocity

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Q:

Which one of the following is not a property of electromagnetic waves?

A) Electromagnetic waves do not show interference and diffraction. B) Oscillating electric field and magnetic field are perpendicular to each other.
C) Electromagnetic waves are transverse waves D) Electromagnetic waves do not require a medium to propagate.
 
Answer & Explanation Answer: A) Electromagnetic waves do not show interference and diffraction.

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Q:

In an optical fibre the signal is transmitted

A) in a straight line path B) In a curved path
C) due to total internal reflection D) Due to refraction
 
Answer & Explanation Answer: D) Due to refraction

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Q:

When we see an object, the image formed on the retina is ________

A) Real and inverted B) Real and erect
C) Virtual and erect D) Virtual and inverted
 
Answer & Explanation Answer: A) Real and inverted

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Q:

Terminal velocity ________.

A) first increases before decreasing B) is constant
C) first decreases before increasing D) always keeps on increasing
 
Answer & Explanation Answer: B) is constant

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Q:

A body of mass 3 kg accelerates from 10 m/s to 20 m/s in 5 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).

 

A) 6 B) 18
C) 12 D) 36
 
Answer & Explanation Answer: A) 6

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Q:

The boiling point of liquids vary as

A)  pressure varies B)  temperature varies
C)  volume varies D) density varies
 
Answer & Explanation Answer: A)  pressure varies

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Q:

If the force applied on the object is in the direction of its motion, the speed of the object __________.

A) increases B) stops
C) decreases D) no effect
 
Answer & Explanation Answer: A) increases

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