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 Physics Questions

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Q:

Weight of a body is maximum at the:

A) Equator B) Pole
C) Subtropics D) Tropics
 
Answer & Explanation Answer: B) Pole

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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:

Find the power of a convex lens if the image formed is at a distance of 10 cm from the lens when the object is placed on the other side of the lens at 40 cm from the optical centre?

A) 12.5 diopters B) 7.5 diopters
C) -12.5 diopters D) -7.5 diopters
 
Answer & Explanation Answer: A) 12.5 diopters

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Q:

______________ of a wave is the rate of transfer of energy per unit area perpendicular to the direction of travel of the wave.

A) Interference B) Rectification
C) Intensity D) Diffraction
 
Answer & Explanation Answer: C) Intensity

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Q:

Steel is more elastic than Rubber. True or False?

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Elasticity is measured as ratio of stress to strain. For a given amount of stress, the strain produced in the steel is comparatively smaller than the strain produced in the rubber.


 


Therefore, with the help of Young's modulus, it can be concluded that steel has greater elasticity than rubber.

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Subject: Physics
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Q:

Anemometer is an instrument meant for measuring __________

A) velocity B) air masses
C) wind speed D) temperature
 
Answer & Explanation Answer: C) wind speed

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Q:

When ice floats on water, its _____ part remains outside the water.

A) 0.5 B) 0.3
C) 0.1 D) 1
 
Answer & Explanation Answer: C) 0.1

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Q:

If the vector sum of torques acting on a system is zero, then the object is in _______.

A) static equilibrium B) translatory equilibrium
C) linear equilibrium D) rotational equilibrium
 
Answer & Explanation Answer: D) rotational equilibrium

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