30000+ Important MCQs for POLICE SI

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Learn POLICE SI MCQs with answers [Page 18 of Department 70]

M

Mr. Dubey • 100.69K Points
Coach Physics

172) Which of the statement is incorrect about the simple microscope?

  • (A) Magnification of microscope is inversely proportional to the least distance of distinct vision.
  • (B) A convex lens of microscope with shorter focal length yields higher magnification.
  • (C) Biology students use to see the slides.
  • (D) It is not used for magnification of an object at far away from the observer.
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Correct Answer - Option (A)

Explanation :

Magnification of microscope is inversely proportional to the least distance of distinct vision.

M

Mr. Dubey • 100.69K Points
Coach Physics

173) Suppose you drive to Delhi (200 km away) at 400 km/hr and return at 200 km/hr. What is yours average speed for the entire trip?

  • (A) Zero
  • (B) 300 Km/hr
  • (C) Less than 300 Km/hr
  • (D) More than 300 Km/hr
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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

M

Mr. Dubey • 100.69K Points
Coach Physics

174) A system undergoes a reversible adiabatic process. The entropy of the system

  • (A) increases
  • (B) decreases
  • (C) remains constant
  • (D) may increase or may decrease
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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

M

Mr. Dubey • 100.69K Points
Coach Physics

175) A narrow white light beam fails to converge at a point after going through a converging lens. This defect is known as

  • (A) polarization
  • (B) spherical aberration
  • (C) chromatic aberration
  • (D) diffraction
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Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

M

Mr. Dubey • 100.69K Points
Coach Physics

176) In a room where the temperature is 30°C a body cools from 61°C to 59°C in 4 minutes. The time taken by the body to cool from 51°C to 49°C will be about

  • (A) 4 minutes
  • (B) 6 minutes
  • (C) 5 minutes
  • (D) 8 minutes
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Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

M

Mr. Dubey • 100.69K Points
Coach Physics

178) A particle is moving in translatory motion. If momentum of the particle decreases by 10%, kinetic energy will decrease by

  • (A) 20%
  • (B) 19%
  • (C) 10%
  • (D) 5%
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Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

G

Gaurav Lamba • 2.83K Points
Extraordinary Math

179) A shopkeeper marks his goods 20% above his cost price and gives 15% discount on the marked price. His gain percent is

  • (A) 1%
  • (B) 2%
  • (C) 5%
  • (D) 4%
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Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

G

Gaurav Lamba • 2.83K Points
Extraordinary Math

180) The marked price of a radio is Rs.4,800. The shopkeeper allows a discount of 10% and gains 8%. If no discount is allowed, his gain per cent will be

  • (A) 25%
  • (B) 22%
  • (C) 18%
  • (D) 20%
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Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

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