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Q:

What is the type of Energy possessed by a stretched rubber band?

A) Potential energy B) Kinetic energy
C) Chemical energy D) Thermal energy
 
Answer & Explanation Answer: D) Thermal energy

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Q:

___ is a unit of length, roughly the distance from Earth to the Sun.

A) Light years B) Astronomical unit
C) Kelvin D) Joule
 
Answer & Explanation Answer: B) Astronomical unit

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Q:

If the resistance of a conductor is doubled, the current gets halved. This is because

A) I = V - R B) I = V/R
C) I = Rn/V D) I = VR
 
Answer & Explanation Answer: B) I = V/R

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Q:

What is the resistance (in Ω) of an electrical component if a current of 0.2 A passes through it on application of 8 V of potential difference across it?

 

A) 40   B) 1.6  
C) 80   D) 3.2
 
Answer & Explanation Answer: A) 40  

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Q:

If I is the current through a wire and e is the charge of an electron, then the number of electrons crossing in t seconds will be given by

A) e/It B) It/e
C) Ie/t D) Ite
 
Answer & Explanation Answer: B) It/e

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Q:

A ball is dropped from a height of 10 m. It strikes the ground and rebounds up to a height of 2. m. During the collision, the per cent loss in the kinetic energy is

A) 100% B) 25%
C) 50% D) 75%
 
Answer & Explanation Answer: D) 75%

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Q:

What is the principal focus of a spherical mirror?

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

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Q:

Mirages are formed primarily due to ___ of light.

A) Reflection B) Diffusion
C) Refraction D) Scattering
 
Answer & Explanation Answer: C) Refraction

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