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 Physics Questions

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Q:

The angle between the __________and the incident ray is called the angle of incidence.

A) surface B) normal
C) tangent D) reflected ray
 
Answer & Explanation Answer: B) normal

Explanation:
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Q:

Which of the following describes an electric motor?

A) Is found in many appliances with moving parts, like a vacuum cleaner or a blender. B) Changes electric energy to mechanical energy.
C) Uses the interaction between a spinning coil of wire and magnet. D) Can be powered by a hand crank.
 
Answer & Explanation Answer: B) Changes electric energy to mechanical energy.

Explanation:

An electric motor is an electrical machine that converts electrical energy into mechanical energy.

                                   Which_of_the_following_describes_an_electric_motor1596165769.jpg image

Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. 

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Q:

Alternate freezing and thawing often leads to ______.

A) Creep B) Slumps
C) Mud flows D) Earth flows
 
Answer & Explanation Answer: A) Creep

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2 1755
Q:

When light passes from one medium to another, this phenomenon of change in its direction is called _____.

A) Refraction B) Diffraction
C) Propagation D) No option is correct
 
Answer & Explanation Answer: A) Refraction

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Q:

The absolute refractive index of any medium is always:

A) more than one B) 0
C) 1 D) less than one
 
Answer & Explanation Answer: A) more than one

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Q:

In which form is the supplied heat energy stored during change in temperature of substance?

A) Heat energy B) Kinetic energy
C) Potential energy D) Both kinetic and potential energy
 
Answer & Explanation Answer: B) Kinetic energy

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Q:

Heat flows as a result of difference of _____.

A) Temperature B) Density
C) mass D) Volume
 
Answer & Explanation Answer: A) Temperature

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Q:

A particle is thrown vertically upward. When it reaches the highest point, it has ____________

A) a downward acceleration B) an upward acceleration
C) a downward velocity D) a horizontal velocity
 
Answer & Explanation Answer: A) a downward acceleration

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