Reason for twinkling of stars is?

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• The reason for a swimming pool to appear less deep than the actual depth is?

  (A) Reflection
  (B) Interference
  (C) Light scattering
  (D) Refraction

  ►Correct Option
  
  Correct Option is: D
  

  Published on 16-04-2022

• Which one of the following lenses should be used to correct the defect of astigmatism?

  (A) Concave lens
  (B) Convex lens
  (C) Bifocal lens
  (D) Cylindrical lens

  ►Correct Option
  
  Correct Option is: D
  

  Published on 16-04-2022

• An air bubble in water behaves as a?

  (A) Convex lens
  (B) Concave lens
  (C) Convex mirror
  (D) Concave mirror

  ►Correct Option
  
  Correct Option is: B
  

  Published on 16-04-2022

• If the length of a simple pendulum is halved then its period of oscillation is?

  (A) Halved
  (B) Doubled
  (C) Increased by a factor √2
  (D) None of the above

  ►Correct Option
  
  Correct Option is: C
  

  Published on 16-04-2022

• The value of g is minimum at planet __ and maximum at planet __.

  (A) Mars, Saturn
  (B) Neptune, Mercury
  (C) Mercury, Jupiter
  (D) Venus, Saturn

  ►Correct Option
  
  Correct Option is: C
  

  Published on 16-04-2022

• The irregularity in the motion of star is called?

  (A) Bumping
  (B) Wobbling
  (C) Humping
  (D) Lumping

  ►Correct Option
  
  Correct Option is: B
  

  Published on 16-04-2022

• When a body is pushed or pulled by a force?

  (A) The work done is positive
  (B) The work done is negative
  (C) The work done is zero
  (D) None of the above

  ►Correct Option
  
  Correct Option is: A
  

  Published on 16-04-2022

• Which one of the following is non -renewable source of energy?

  (A) Natural gas
  (B) Bio gas
  (C) Tidal gas
  (D) Geothermal energy

  ►Correct Option
  
  Correct Option is: A
  

  Published on 16-04-2022