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 Physics Questions

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Q:

If V/I is a constant, it is called:

 

A) Potential difference B) Current
C) Coulomb D) Resistance
 
Answer & Explanation Answer: D) Resistance

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Q:

Mechanical energy is the combination of kinetic energy and

 

A) Heat energy B) Chemical energy
C) Potential energy D) Nuclear energy
 
Answer & Explanation Answer: C) Potential energy

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Q:

Which of the following has highest penetration power?

 

A) α– radiations   B) β– radiations  
C) γ– radiations   D) All have same penetration power.  
 
Answer & Explanation Answer: C) γ– radiations  

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Q:

An air bubble in water will act like a

A) convex lens B) convex mirror
C) concave lens D) concave mirror
 
Answer & Explanation Answer: C) concave lens

Explanation:

An_air_bubble_in_water_will_act_like_a1557488532.jpg image

The lens which have atleast one inward curved surface is a concave lens. Concave ens is a diverging lens as it spreads out light rays that have been refracted through it.

A concave lens is thinner at its centre than at its edges.

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Q:

Which statement best describes the formation of diamonds?

 

A) Diamonds form in talc under very high pressure. B) Diamonds form in kimberlites under very high pressure.
C) Diamonds form in kimberlites under very low pressure. D) Diamonds form in talc under very low pressure.
 
Answer & Explanation Answer: B) Diamonds form in kimberlites under very high pressure.

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Q:

In which of the following examples will an athlete have maximum accelerated motion?

 

A) Running on an octagonal track B) Running on a hexagonal track
C) Running on a rectangular track D) Running on a circular track
 
Answer & Explanation Answer: D) Running on a circular track

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Q:

Light is a ______________ wave.

 

A) longitudinal B) elastic
C) transverse D) mechanical
 
Answer & Explanation Answer: C) transverse

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Q:

According to ohm's law, which of the following is true?

 

A) The current flowing through a wire is directly proportional to the Potential Difference applied across its ends B) The current flowing through a wire is directly proportional to its resistance
C) The current flowing through a wire is indirectly proportional to its length D) The current flowing through the wire is indirectly proportional to the Potential Difference applied across its ends  
 
Answer & Explanation Answer: A) The current flowing through a wire is directly proportional to the Potential Difference applied across its ends

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