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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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Q:

What is the unit of the physical quantity "Inductance"?

A) weber B) farad
C) henry D) tesla
 
Answer & Explanation Answer: C) henry

Explanation:
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Q:

Bending of light rays in denser medium is termed as:

A) Reflection B) Dispersion
C) Refraction D) Deflection
 
Answer & Explanation Answer: C) Refraction

Explanation:
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Q:

Which of the following is a device designed to protect electrical devices from voltage spikes?

A) Voltage unloader B) Surge protector
C) Heat protector D) Current unloader
 
Answer & Explanation Answer: B) Surge protector

Explanation:
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Q:

What is the unit of the physical quantity "Jerk"?

A) meter second B) meter per second cube
C) meter per second square D) meter per second
 
Answer & Explanation Answer: B) meter per second cube

Explanation:
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Q:

Temperature of distant luminous bodies can be determined by

A) Mercury thermometers B) Gas thermometers
C) Pyrometers D) Colour thermometers
 
Answer & Explanation Answer: C) Pyrometers

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Q:

For an ideal gas, which one of the following statements does not hold true?

A) The speed of all gas molecules is same B) The kinetic energies of all gas molecules are not same
C) The potential energy of the gas molecules is zero D) There is no interactive force between the molecules.
 
Answer & Explanation Answer: A) The speed of all gas molecules is same

Explanation:

In an ideal gas, at any particular time, different particles in the gas have different speeds and hence different kinetic energies. This assumption is reasonable because as the particles collide, we expect their speed to change. Even if initial speed of all the particles was same, the molecular collisions will disrupt this uniformity.Hence statement 1 is incorrect and 2 is correct.

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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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