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Which of the following statements is cor...

Which of the following statements is correct about friction?

A

It is a conservative force

B

It may cause the motion of body

C

It may oppose the motion of a moving body

D

Both (2) and (3)

Text Solution

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-MOCK TEST 7-Exercise
  1. Which of the following statements is correct about friction?

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  2. The r.m.s speed of the molecules of an ideal gas Is V0 If pressure of ...

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  3. One mole of monatomic gas [gamma =5/3]is mixed with two moles of polya...

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  4. E is the average rotational kinetic energy per mole of a diatomic gas ...

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  5. Internal energy of n moles of helium at temperature T1 K is equal to t...

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  6. The expansion of unit mass of a perfect gas at constant pressure as sh...

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  7. Volume versus temperature (V-T) graph of an ideal gas of equal number ...

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  8. The average kinetic energy per molecule of an ideal nonlinear polyatom...

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  9. If speeds of the four molecules of an ideal gas are v, 3v, 5v and 7v r...

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  10. An ideal gas is in a container of volume V0 at pressure P0 If the same...

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  11. If the intensity of sound increased by a factor of 20 then the sound l...

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  12. An open organ pipe of length L vibrates in its second harmonic mode. T...

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  13. The equation of standing wave in a stretched string is given by {y =2s...

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  14. Two plane progressive waves are given as (y1 = A1 sin) (Kx -omrga t) a...

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  15. Two coherent plane progressive waves are represented by [y1 = sin (200...

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  16. On the superposition of two waves [y1 = 3 sin (50 pi t - 20x)] and [y2...

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  17. The characteristics of sound with the help of which we can distinguish...

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  18. Doppler shift in frequency of sound is independent of (Source is movin...

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  19. The change in entropy of the melting ice of 1kg at 273 kelvin is (giv...

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  20. The apparent frequency of the whistle of an engine changes in the rati...

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  21. In determination of velocity of sound in air using resonance column tu...

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