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 Physics Questions

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Q:

For which one of the following does the centre of mass lie outside the body?

A) A fountain pen B) A cricket ball
C) A ring D) A book
 
Answer & Explanation Answer: C) A ring

Explanation:

For balancing the weight of ring, you need to put your finger or any solid object inside the ring so that you will be able to sustain their own weight because they are not able to sustain their own weight.so its centre of mass lies outside the body.

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Q:

Why does water tank appear shallower when viewed from the top?

A) Due to reflection B) Due to refraction
C) Due to diffraction D) Due to total internal reflection
 
Answer & Explanation Answer: B) Due to refraction

Explanation:
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Q:

When light passes from one medium to another, this phenomenon of change in its direction is called _____.

A) Refraction B) Diffraction
C) Propagation D) No option is correct
 
Answer & Explanation Answer: A) Refraction

Explanation:
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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

Explanation:
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Q:

Two vectors are said to be equal if

A) only their magnitudes are same B) only their directions are same
C) both magnitude and direction are same D) magnitudes are same but directions are opposite
 
Answer & Explanation Answer: C) both magnitude and direction are same

Explanation:
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Q:

The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

A) 8.5 A B) 24 A
C) 10 A D) 12 A
 
Answer & Explanation Answer: A) 8.5 A

Explanation:
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Q:

An object with a mass of 22 kg moving with a velocity of 5 m/s possesses a kinetic energy of :

A) 275 J B) 110 J
C) 2750 J D) 110 J
 
Answer & Explanation Answer: A) 275 J

Explanation:
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Q:

For photoelectric effect to take place, the metal used as the cathode should have_________

A) high melting point B) low melting point
C) Low work function D) low resistance
 
Answer & Explanation Answer: C) Low work function

Explanation:
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