20000+ Important MCQs for AIR FORCE

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Learn AIR FORCE MCQs with answers [Page 15 of Department 75]

M

Madan • 7.44K Points
Tutor III Physics

141) Blotting paper absorbs ink due to

  • (A) Capillary action phenomenon
  • (B) Diffusion of ink through the blotting
  • (C) Siphon action
  • (D) Viscosity of ink
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Correct Answer - Option (A)

Explanation :

Blotting paper absorbs ink by the process of capillary action. The capillary action is based on the property of surface tension of liquid.

All unsized paper will absorb water. Blotting paper is not sized and made bulkier to provide capillary action for faster absorption of liquid.

Blotting paper has also been sold as a cosmetic to aid in the removal of skin oils and makeup.

L

Lalit Singh • 4.06K Points
Extraordinary History

144) First education minister of independent India?

  • (A) Indira Gandhi
  • (B) Durba Banerjee
  • (C) Maulana Abul Kalam Azad
  • (D) Sucheta Kripalani
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Correct Answer - Option (C)

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

L

Lalit Singh • 4.06K Points
Extraordinary History

145) Which of the following was most probably the first metal to be used in India?

  • (A) copper
  • (B) Gold
  • (C) Siver
  • (D) Iron
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Correct Answer - Option (A)

Explanation :

The earliest historic evidences of use of metal are of Chalcolithic Age or Stone-Copper Age, which covered the period from 1800 - 800 BC. This period was by the use of Copper as well as stone.
Hence, the first metal to be used in India is Copper.

L

Lalit Singh • 4.06K Points
Extraordinary History

146) The First Battle of panipat was fought between the forces of

  • (A) Akbar and Hemu
  • (B) Abdali and the Marathas
  • (C) Humayun and Sher Shah Suri
  • (D) Babar and Ibrahim Lodhi
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Correct Answer - Option (D)

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

R

Rohit Singh • 677 Points
Invincible Math

147) A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is

  • (A) 35.55 km/hr
  • (B) 36 km/hr
  • (C) 71.11 km/hr
  • (D) 71 km/hr
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Correct Answer - Option (C)

Explanation :

Total time taken = (160/64 + 160/8)hrs
= 9/2 hrs.
Average speed = (320 x 2/9) km.hr
= 71.11 km/hr.

R

Rohit Singh • 677 Points
Invincible Math

148) The salaries of A, B, and C are in the ratio of 1 : 2 : 3. The salary of B and C together is Rs. 6000. By what percent is the salary of C more than that of A?

  • (A) 100%
  • (B) 200%
  • (C) 300%
  • (D) 600%
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Correct Answer - Option (B)

Explanation :

Let the salaries of A, B, C be x, 2x and 3x respectively.

Then,2x + 3x = 6000 => x = 1200.

A's salary = Rs. 1200, B's salary = Rs. 2400, and Cs salary Rs. 3600.
Excess of C's salary over A's=[ (2400 /1200) x 100] = 200%.

R

Rohit Singh • 677 Points
Invincible Math

149) The average of 11 numbers is 10.9. If the average of the first six numbers is 10.5 and that of the last six numbers is 11.4, then the middle number is

  • (A) 10.5
  • (B) 11.5
  • (C) 12.5
  • (D) 13.5
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Correct Answer - Option (B)

Explanation :

Middle numbers = [(10.5 x 6 + 11.4 x 6) - 10.9 x 11] = (131.4 - 119-9) = 11.5.

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