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Q:

Reflection from a smooth surface like that of a mirror is called ___________ reflection.

A) regular B) irregular
C) diffused D) fused
 
Answer & Explanation Answer: A) regular

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Q:

Which phenomena shows the particle nature of light?

A) Diffraction B) Interference
C) Photoelectric effect D) Polarisation
 
Answer & Explanation Answer: C) Photoelectric effect

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Q:

Who discovered theory of relativity?

A) Isaac Newton B) Albert Einstein
C) Niel Bohr D) Michael Faraday
 
Answer & Explanation Answer: B) Albert Einstein

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Q:

Kinetic energy depends on

A) the velocity or speed of the moving body. B) the mass of the moving body
C) the pressure of the moving body D) both mass and velocity of the moving body
 
Answer & Explanation Answer: D) both mass and velocity of the moving body

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Q:

What type of force acts on a car moving around a curve?

A) Centrifugal force B) Cohesive force
C) Centripetal force D) Gravitational force
 
Answer & Explanation Answer: C) Centripetal force

Explanation:

It is a force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving is called as Centripetal force.

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Q:

If the velocity of a body is halved its kinetic energy ________________.

A) become 4 times B) becomes 1/4 th
C) is also doubled D) becomes half
 
Answer & Explanation Answer: B) becomes 1/4 th

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Q:

A   parallel-plate   capacitor,with   air   in between  the  plates,  has  capacitance  C. Now  the  space  between  the  two  plates  of the  capacitor  is  filled  with  a  dielectric  of dielectric constant 7. Then the value of the capacitance will become

A) C B) C/7
C) 7C D) 14C
 
Answer & Explanation Answer: C) 7C

Explanation:

As  the  capacitance  is  charged  by the  factor  equal  to  the  value  of dielectric constant, Hence, C’ = kC = 7C

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Q:

Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre?

A) -3.75 diopters B) -11.25 diopters
C) 3.75 diopters D) 11.25 diopters
 
Answer & Explanation Answer: D) 11.25 diopters

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