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 Physics Questions

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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:

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 instrument is used to measure humidity?

 

A) Pyrometer B) Hydrometer
C) Hygrometer D) Calorimeter
 
Answer & Explanation Answer: C) Hygrometer

Explanation:

Hygrometer is used for measuring humidity of air.

 

 

 

 

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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 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:

Calculate the power (in W) of an engine if it can perform 120 J of work in 3 seconds.

 

A) 360 B) 80
C) 180 D) 40
 
Answer & Explanation Answer: D) 40

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Q:

____ is not a type of heat transfer.

 

A) Diffusion B) Reflection
C) Convection D) Radiation
 
Answer & Explanation Answer: B) Reflection

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