Physics Test - 64

Because the refractive index of glass is highest, light travels slowly in Glass.

We know that the speed of light depends on the refraction index. The higher the index of refraction is, the slower the speed of light is.

R.I of air and vacuum = 0 (air is a teeny bit more but can be taken as 0)

R.I of water = 1.33

R.I of glass = 1.4.

Hence, Light travels slowest in Glass.

Pick out the only vector quantity impulse.

Sea appears blue in colour due to the scattering of the rays when they hit water molecules.

The absorption of ink by blotting paper involves capillary action phenomenon because the blotting paper is a thin and a smooth paper which allows a little thicker liquids like ink to absorb.

Scalar Quantities arephysical quantities which have magnitude only and no direction.

Doing more work in less time, results in an increase in power to do a work.

Force, impulse groups have quantities that do not have the same dimensions.

In case of uniform circular motion, the acceleration is variable in magnitude but constant in direction.

The size of the pupil of the automatically adjusts itself according to the intensity of light passing through it; if the intensity is more, the size is less, if less, it is more. So in our case the pupil should dilate i.e , increase in size to be able to see in the dark. This switchover takes some time. But here the entry into the dark room is immediate. So the eye has no time to adjust itself and hence is not able to see at all for a while.

Sound intensity is measured in decibels(db). Sound pollution above 120 db becomes more hazardous and have adverse affects on human life.