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Q:

In a streamline flow, ________ at every point in the fluid remains same.

A) force B) pressure
C) pressure D) speed
 
Answer & Explanation Answer: C) pressure

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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:

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:

Air expands when it _______________.

A) is cooled B) is heated
C) is under pressure D) becomes more humid
 
Answer & Explanation Answer: B) is heated

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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:

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:

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:

Which  one  of  the following  is  the  value  of one nanometer?

A) 10-7 cm B) 10-6 cm
C) 10-4  cm D) 10-3  cm
 
Answer & Explanation Answer: A) 10-7 cm

Explanation:

1 nanometer (nm) of length

Equals: 0.00000010 centimetres (cm) in length.

This is equal to 10^-7 cm.

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