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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:

The SI unit of weight is a

A) Kg B) Newton
C) Gram D) Dyne
 
Answer & Explanation Answer: B) Newton

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Q:

The energy released at the end of digestion is in the form of

A) thermal energy B) electric energy
C) kinetic energy D) chemical energy
 
Answer & Explanation Answer: D) chemical energy

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Q:

Which of the following does NOT contribute to sparkling of diamonds?

A) Total Internal Reflection B) High Refractive Index of Diamonds
C) Dispersion D) Low Refractive Index of Diamonds
 
Answer & Explanation Answer: D) Low Refractive Index of Diamonds

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Q:

Find the resistance (in mega Ω) of a wire of length 10 m, cross sectional area 1 cm2 and made of a material of resistivity 100 Ωm.

 

A) 1000   B) 20  
C)  500   D) 10
 
Answer & Explanation Answer: D) 10

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Q:

Sensitivity of potentiometer can be increased by

A) increasing the e.m.f. of the cell B) increasing the length of the potentiometer
C) decreasing the length of the potentiometer wire D) none of these
 
Answer & Explanation Answer: B) increasing the length of the potentiometer

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Q:

Sensitivity of potentiometer can be increased by

A) increasing the length of the potentiometer wire B) increasing the e.m.f of the cell
C) decreasing the length of the potentiometer wire D) none of these
 
Answer & Explanation Answer: A) increasing the length of the potentiometer wire

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Q:

What happens to the Potential and Kinetic energies of a body as it falls down from a height?

A) Its Potential energy decreases while its Kinetic energy increases B) There is no change in its Potential or Kinetic energy
C) Its Potential and Kinetic energies decrease D) Its Potential energy increases while its Kinetic energy decreases
 
Answer & Explanation Answer: A) Its Potential energy decreases while its Kinetic energy increases

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