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Q:

A galvanometer can be converted into a voltmeter by connecting with it a

A) high resistance in parallel B) low resistance on parallel
C) high resistance on series D) low resistance in series
 
Answer & Explanation Answer: C) high resistance on series

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Q:

Weight (W) of a body can be given by the formula

A) W = mv B) W = mf
C) W = ms D) W = mg
 
Answer & Explanation Answer: D) W = mg

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Q:

Pressure cooker cooks rice faster because

A) it always lets the steam escape B) high pressure raises the boiling point of water
C) high pressure crushes the hard covering of rice grains D) it does not let the heat energy escape easily
 
Answer & Explanation Answer: B) high pressure raises the boiling point of water

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Q:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is half of that of earth and radius is same as that of earth is _________________.

 

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

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Q:

Sound travels at a speed of 333 m/s in the air, thus, in 1 s, a distance of 333 m is travelled by

A) source B) disturbace
C) particles D) receiver
 
Answer & Explanation Answer: B) disturbace

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Q:

The attenuation in optical fibre is mainly due to

A) Scattering B) Absorption
C) Both (a) and (b) D) Neither absorption nor scattering
 
Answer & Explanation Answer: A) Scattering

Explanation:

The reason for transmitting data over optical fibers, is because the speed of data transmission through optical wires are equal to the speed of light. The intense speed of data transfer speed, has lead to the use of optical fibers. The optical fiber uses the technology of transferring light beams, from one end to the other end of optical cables. The attenuation in optical fiber is due to Scattering. The reason why scattering is caused, due to the folding, in the wire.

 

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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:

HEPA filters are used to remove microbes from

A) human tissues B) air
C) medical instruments D) liquids
 
Answer & Explanation Answer: B) air

Explanation:

High-efficiency particulate air (HEPA), also known as high-efficiency particulate absorbing and high-efficiency particulate arrestance, is an efficiency standard of air filter.

hepa-filters1596516018.png image

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