Physics Questions

Q:

Which of the following electromagnetic waves has minimum wavelength?

 

A) Alpha B) Gamma
C) Infrared D) X-rays
 
Answer & Explanation Answer: B) Gamma

Explanation:
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Q:

What is measured with the Nephometer?

 

A) volume of rainfall B) Cloud volume and speed
C) Salinity of Sea D) All options are correct.
 
Answer & Explanation Answer: B) Cloud volume and speed

Explanation:
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Q:

Any body kept in a fluid experiences an upward force called _____________.

 

A) torque B) moment
C) pressure D) upthrust
 
Answer & Explanation Answer: D) upthrust

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Q:

Generally atomic radius is measured in which unit?

 

A) Fermi B) Millimeter
C) Angstrom D) Micrometer
 
Answer & Explanation Answer: C) Angstrom

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Q:

Which of the following is not true about Frictional force?

 

A) Friction is the force which opposes the relative motion of two surfaces in contact B) The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction
C) Friction in machines wastes energy and also causes wear and tear D) Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction
 
Answer & Explanation Answer: D) Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction

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Q:

Which type of fault is under compression?

 

 

A) shear B) normal
C) reverse D) strike-slip
 
Answer & Explanation Answer: C) reverse

Explanation:

Reverse faults occur in areas undergoing compression. In a reverse fault, the block above the fault moves up relative to the block below the fault.

 

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Q:

A forensic tool used to identify the chemical makeup?

 

A) calibur B) lie detector
C) gas chromatograph D) ballistics
 
Answer & Explanation Answer: C) gas chromatograph

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Q:

Which of the following represents a relation for ‘heat lost = heat gained’?

 

A) Principle of thermal equilibrium B) Principle of colors
C) Principle of calorimetry D) Principle of vaporization
 
Answer & Explanation Answer: C) Principle of calorimetry

Explanation:

Heat lost by hot object = Heat gained by cold object

where we ignore heat gained or lost from/to the surroundings.

The study of heat gained and lost in this manner is often called Calorimetry.

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