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Q:

If the frequency of a sound wave of given velocity is increased , how will it affect its wavelength?

A) Its wavelength will increase B) The wavelength will not be affected
C) Its wave length will decrease D) Wavelength will keep increasing and decreasing alternately
 
Answer & Explanation Answer: C) Its wave length will decrease

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Q:

Sound is a

A) Electromagnetic wave B) Surface wave
C) Mechanical wave D) Tidal wave
 
Answer & Explanation Answer: C) Mechanical wave

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Q:

Which of the following physical quantities changes or tends to change the state of rest or of uniform motion of a body in a straight line?

A) Force B) Mass
C) Momentum D) Inertia
 
Answer & Explanation Answer: A) Force

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Q:

Mechanical energy is equal to

A) Kinetic energy + Chemical energy B) Kinetic energy + Potential energy
C) Kinetic energy + Heat energy D) Kinetic energy + Electrical energy
 
Answer & Explanation Answer: B) Kinetic energy + Potential energy

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Q:

Why does a sprinter keep running even after crossing the finishing line?

A) He wants to make sure that he crosses the line B) Inertia of rest takes some time to make him stop
C) Inertia of motion keeps him moving D) Friction between his shoes and the ground causes him to move beyond the line
 
Answer & Explanation Answer: C) Inertia of motion keeps him moving

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Q:

An electric motor converts

A) Mechanical energy into electrical energy B) Thermal energy into electrical energy
C) Electrical energy into mechanical energy D) Radiant energy into electrical energy
 
Answer & Explanation Answer: C) Electrical energy into mechanical energy

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Q:

What is the Centre of Curvature of a spherical mirror?

A) It is the centre of a hollow sphere of which the spherical mirror is a part B) It is the midpoint of a spherical mirror
C) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection D) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror
 
Answer & Explanation Answer: A) It is the centre of a hollow sphere of which the spherical mirror is a part

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Q:

A source maintains a current I in a resistor of resistor of resistance R. If V is the potential difference across the resistor. The electrical energy dissipated in the resistor in time is given _____

 

A) VI2t B) V2It
C) IR2t D) VIt
 
Answer & Explanation Answer: D) VIt

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