The force of friction between two surfaces will increase if:
A. A layer of lubricant is kept between the two surfaces
B. The two surfaces are pressed harder
C. Air gap is created between the two surfaces
D. Irregularities on both the surfaces are removed
Answer: Option B
Solution(By Examveda Team)
The friction between two surfaces can be increased if the surfaces are pressed into each other with greater force. The harder the brakes are pushed, the harder the pads get pressed into the discs and the more friction is generated.Which of the following terms is not used in the field of physics?
A. Latent heat
B. Nuclear fusion
C. Refractive index
D. Stock value
Radiocarbon is produced in the atmosphere as a result of
A. Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
B. Action of ultraviolet light from the sun on atmospheric oxygen.
C. Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
D. Lightning discharge in atmosphere.
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.
B. Work done in lifting the stone is equal to rolling it.
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.
The absorption of ink by blotting paper involves:
A. Viscosity of ink
B. Capillary action phenomenon
C. Diffusion of ink through the blotting
D. Siphon action
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