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Aeroplanes are made to run on runway bef...

Aeroplanes are made to run on runway before take - off because it …………………. .

A

decreases friction

B

decrease viscous drag of air

C

decreases atmospheric pressure

D

provides required life to the aeroplane

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The correct Answer is:
D
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FULL MARKS-PROPERTIES OF MATTER-Additional Questions Solved - Choose the Correct Answers
  1. If a stream of air is blown under one of the pans of a physical balanc...

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  2. Water venturimeter works on the principle of ………… .

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  3. Aeroplanes are made to run on runway before take - off because it …………...

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  4. When the terminal velocity is reached, the acceleration of a body movi...

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  5. If a raindrop with a mass of 0.05 g falls with constant velocity, the ...

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  6. If temperature rises, the coefficient of viscosity of a liquid ……….. .

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  7. The velocity of a rain drop attains constant value because of ………….. .

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  8. With an increase in temperature, the viscosity of liquid and gas, resp...

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  9. Two small spheres of radii r and 2r fall through a viscous liquid with...

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  10. Viscosity is the property of liquids by virtue of which they ………….. .

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  11. Streamlined flow is more likely for liquids with ………….. .

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  12. The dimensional formula of coefficient of viscosity is …………… .

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  13. A good lubricant should have ………….. .

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  14. If a liquid wets a solid surface, the angle of contact is …………. .

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  15. When some detergent is added to water, the surface tension …………… .

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  16. Rain drops are spherical because of ………….. .

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  17. At critical temperature the surface tension of a liquid ………….. .

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  18. A liquid will not wet the surface of a solid if the angle of contact i...

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  19. The surface tensions of soap solution is 25 xx 10^(-3) Nm^(-1). The ex...

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  20. Surface tension does not depends on ……… .

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