Physics Test - 60

In physics, we know that the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.

Hence, An object that has kinetic energy must be in motion i.e, moving.

The size of the pupil of the eye 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 sometime. 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.

Number of spectral lines from a state n to ground state is n(n-1)/2 = 6.

Weight is mass x g. Since mass is constant and g is only 1/6^thof that on the earth. The weight on the moon is only 1/6^th of that on the earth.

Therefore 2N i.e (b) is the answer.

Parasec is the unit of distance.

Here Oil is the most viscous liquid.

The liquid with the most intermolecular force is high viscous. viscosity is how smoothly a liquid flows and how hardly the liquid flows it is highly viscous.

Time does not depend on mass, else

$T\infty \sqrt{\left(1+\frac{k^2}{R^2}\right)}$

k²/R²=> is least for 'sphere' and

hence least time is taken by sphere.

The light from the sun takes about 8 minutes to reach the Earth after it has been emitted from the sun's surface.

The time it takes for light to reach planets in our Solar System varies from about 3 minutes for Mercury to about 5.3 hours for Pluto.

Flows out of Newton's first law of motion.

The inside of the bulb being a vacuum, the outside air rushes in when the bulb is broken. The vibrations of the rushing air molecules produce the sound.