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 Physics Questions

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Q:

Rotameter is used to measure

A) Vortex flow B) Density of fluids
C) Velocity of fluid in pipes D) Flow of fluids
 
Answer & Explanation Answer: D) Flow of fluids

Explanation:

A rotameter is a flow meter that measures volumetric flow of liquids and gases.

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Q:

If electric resistance is to be decreased, then the number of resistances should be connected in ________________

A) Series B) Parallel
C) Mixed arrangement D) None of these
 
Answer & Explanation Answer: B) Parallel

Explanation:
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Q:

Which among the following is a vector quantity?

A) Heat B) Angular momentum
C) Work D) Time
 
Answer & Explanation Answer: B) Angular momentum

Explanation:
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Q:

If the mass of an object is 60 kgs, what will be its weight on the moon? (N=Newton)

A) 60N B) 600N
C) 100N D) 10N
 
Answer & Explanation Answer: C) 100N

Explanation:
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Q:

Electrical Arcing occurs when

Answer

An electric arc is a visible plasma discharge between two electrodes that is caused by electrical current ionizing gasses in the air. Electric arcs occur in nature in the form of lightning.

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Q:

A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.

A) 2 B) 0.1
C) 4 D) 0.05
 
Answer & Explanation Answer: D) 0.05

Explanation:
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Q:

In the formula average velocity = (u + v) /2, u is the ___________.

A) Final velocity B) Initial displacement
C) Initial velocity D) Final displacement
 
Answer & Explanation Answer: C) Initial velocity

Explanation:
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Q:

Which of the following performs modulation and demodulation?

A) coaxial cable B) modem
C) fiber optic D) satellite
 
Answer & Explanation Answer: B) modem

Explanation:

A modem is a hardware device which performs both modulation and demodulation. MODEM means (Modulator-Demodulator).

 modem_1593758111.png image

 

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