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 Physics Questions

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Q:

Which of the following waves cannot be polarised?

A) Radio B) Ultra violet
C) Infrared D) Ultrasonic
 
Answer & Explanation Answer: D) Ultrasonic

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Q:

The force of friction between two surfaces will increase if:

A) a layer of lubricant is kept between the two surfaces B) the two surfaces are pressed harder
C) air gap is created between the two surfaces D) irregularities on both the surfaces are removed
 
Answer & Explanation Answer: B) the two surfaces are pressed harder

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Q:

The SI unit of G, the universal gravitation constant is ______________.

A) N m2 kg2 B) N m2 kg-2
C) N m-2 kg-2 D) N m-2 kg2
 
Answer & Explanation Answer: B) N m2 kg-2

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Q:

An object is placed on the principal axis of a cortex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?

A) 20 cm B) 15 cm
C) 30 cm D) 10 cm
 
Answer & Explanation Answer: B) 15 cm

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Q:

Cryogenics is a branch of Physics that deal with ______.

A) very high temperatures B) very low temperatures
C) growth of extremely small crystals D) growth of extremely large crystals
 
Answer & Explanation Answer: B) very low temperatures

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Q:

A raised hammer possesses

A) Kinetic energy B) Mechanical energy
C) Muscular energy D) Potential energy
 
Answer & Explanation Answer: D) Potential energy

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Q:

At boiling point of liquids , its

A) Temperature increases B) Atmospheric pressure increases
C) Temperature remains constant D) Vapour pressure decreases
 
Answer & Explanation Answer: C) Temperature remains constant

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Q:

A rocket is launched to travel vertically upward with a constant velocity of 20 m/s. After travelling for 35 seconds, the rocket develops a snag and its fuel supply is cut off. The rocket then travels like a free body. The height achieved by it is

A) 680 m B) 720 m
C) 800 m D) 700 m
 
Answer & Explanation Answer: B) 720 m

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