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Physics

Physics
Which one of the following wavelengths of light is most effective in photosynthesis ?

Yellow
Blue
Green
Orange

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Physics
A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/s2) is:

5
6
7
3

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Physics
Vegetables are cooked in lesser time by adding a pinch of salt while cooking because

Boiling point of water increases
Latent heat of vaporization of water increases
Latent heat of vaporization of water decreases
Boiling point of water decreases

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Physics
In severe winter, in cold countries water pipes burst because

Contraction of water pipes
Water expands on freezing
Combined effect of all the above three
High atmospheric pressure

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Physics
Which law relates to the ideal gas law?

P1T1 = P2T2
T1/V1 = T2/V2
P1V1 = P2V2
P1/V1 = P2/V2

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Physics
A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?

Both reach at the same time
Disk
Depends on their masses
Sphere

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