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Q:

Assuming that the charge of an electron is 1.6 x 10-19 C, the number of electrons passing through a section of wire per second when the wire carries a current of 1 A is

 

 

 

A) 6.25 x 1018 C B) 1.6 x 10-19 C
C) 1.6 x 1019 C D) 0.625 x 1017 C
 
Answer & Explanation Answer: A) 6.25 x 1018 C

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Q:

The pitch of a sound depends on its ____.

A) frequency B) wavelength
C) amplitude D) timbre
 
Answer & Explanation Answer: A) frequency

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Q:

Which among the following is false about displacement?

A) It can be positive, negative or zero B) Displacement is never greater than Distance
C) Its SI unit is meter D) It is always positive
 
Answer & Explanation Answer: D) It is always positive

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Q:

Rate of work done is _______.

A) Energy B) Power
C) Momentum D) Impulse
 
Answer & Explanation Answer: B) Power

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Q:

A rocket is launched to travel vertically upward with a constant velocity of 20 m/s. After travelling for 35 seconds, the rocket develops a snag and its fuel supply is cut off. The rocket then travels like a free body. The height achieved by it is

A) 680 m B) 720 m
C) 800 m D) 700 m
 
Answer & Explanation Answer: B) 720 m

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Q:

What is the unit of electric resistance?

A) Dyne B) Pascal
C) Joule D) Ohms
 
Answer & Explanation Answer: D) Ohms

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Q:

What is the unit of calorific value?

A) kN/kg B) kJ/kg
C) kW/sec D) kCal/sec
 
Answer & Explanation Answer: B) kJ/kg

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Q:

Through which does light travel best?

A) water B) air
C) vacuum D) none
 
Answer & Explanation Answer: C) vacuum

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