20000+ Important MCQs for AIR FORCE

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Learn AIR FORCE MCQs with answers [Page 9 of Department 75]

R

Ram Sharma • 193.88K Points
Coach Physics

82) When two coherent waves interfere, there is

  • (A) Redistribution of energy, which does not change with time
  • (B) Loss in energy
  • (C) Redistribution of energy, which changes with time
  • (D) Gain in energy
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Correct Answer - Option (A)

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R

Ram Sharma • 193.88K Points
Coach Science

83) The water from a hand pump is warm in winter as

  • (A) The temperature inside the earth is higher than the atmospheric temperature
  • (B) Our body is cold in winter & the water seems to be warm
  • (C) The pumping process causes friction which warms up the water
  • (D) Inside water comes out & absorbs heat from the environment
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Correct Answer - Option (A)

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

R

Ram Sharma • 193.88K Points
Coach Physics

84) A sphere rolls down on two inclined planes of different angles but same height, it does so

  • (A) with the same speed
  • (B) in the same time with the same speed
  • (C) in the same time with the same kinetic energy
  • (D) in the same time
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Correct Answer - Option (A)

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

M

Madan • 7.44K Points
Tutor III Math

87) 2 men or 5 women or 7 boys can finish a work in 469 days, then the number of days taken by 7 men, 5 women and 2 boys to finish the work is

  • (A) 134
  • (B) 106
  • (C) 100
  • (D) 98
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Correct Answer - Option (D)

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M

Madan • 7.44K Points
Tutor III Math

88) If 2 men or 3 women or 4 boys can do a piece of work in 52 days. Then the same piece of work will be done by 1 man, 1 woman and 1 boy in ?

  • (A) 48 days
  • (B) 36 days
  • (C) 45 days
  • (D) none of these
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Correct Answer - Option (A)

Explanation :

Work done by 2 men = 3 woman = 4 boys
∴ 1 man = 2 boys
1 woman = 4/3 boys
∴ boys X days = 4 X 52 (boys - days)
Again 1 man + 1 woman + 1 boy = 2 + 4/3 + 1 = 13/3 boys
B1 x D1 = B2 x D2 B = boys, D = days
4 X 52 = 13/3 x D2
D2 = 48 days

M

Madan • 7.44K Points
Tutor III Math

89) A and B can do a piece of work in 6 days and A alone can do it in 9 days. The time taken by B alone to do the same work is ?

  • (A) 18 days
  • (B) 15 days
  • (C) 12 days
  • (D) 7.5 days
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Correct Answer - Option (A)

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

M

Madan • 7.44K Points
Tutor III Math

90) A and B can do a piece of work in 18 days, B and C in 24 days, A and C in 36 days. In what time can they do it all working together ?

  • (A) 12 days
  • (B) 13 days
  • (C) 16 days
  • (D) 26 days
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Correct Answer - Option (C)

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