Question :
A) sand is soft and concreter is hard
B) the friction between sand and feet is less than that between concrete and feet
C) the friction between sand and feet is more than that between concrete and feet
D) the sand is grainy but concrete is smooth
Answer : B
It is more difficult to walk on a sandy road than on a concrete road because
A) sand is soft and concreter is hard
B) the friction between sand and feet is less than that between concrete and feet
C) the friction between sand and feet is more than that between concrete and feet
D) the sand is grainy but concrete is smooth
Answer : B
Description :
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Of the following properties of a wave, the one that is independent of the other is its
A) amplitude
B) velocity
C) wavelength
D) frequency
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Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
A) will overflow
B) will not rise
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It is easier to roll a stone up a sloping road than to lift it vertical upwards because
A) work done in rolling is more than in lifting
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C) work done in both is same but the rate of doing work is less in rolling
D) work done in rolling a stone is less than in lifting it