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To evaporate the water that oozes out, heat is required. Part of this heat is taken from the water inside which therefore become cool. Therefore (C) is correct. Here evaporation is less, so cooling too is less.

The candela is the base unit of luminous intensity in the International System of Units
The lumen is the SI derived unit of luminous flux
The lux is the SI derived unit of illuminance and luminous emittance
The watt is the standard SI unit of power.

Before transferring the fish, the position is the man with the fish and the bucket of water.

After transferring the position is: the man without the fish, but the fish inside the water in the bucket.

Thus to know whether there is any change in weight, it is enough to consider whether there is any change in weight when the fish in air is transferred into the water.

The answer is there is no change as when in water though it loses weight due to upthrust of water on it, the level of water increases and exerts an equal force at the bottom.So, (c) is correct.

DescriptionThe light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres or 5.88 trillion miles. As defined by the International Astronomical Union, a light-year is the distance that light travels in vacuum in one Julian year.

If we connect bulb in series, then bulb with higher resistance will glow brighter than low resistance bulb.


If we connect bulb in parallel, then bulb with lower resistance will glow brighter than high resistance bulb.

The optical fibre is a device which works on the principle of total internal reflection by which light signals can be transmitted from one place to another with a negligible loss of energy.

Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So, by Newton’s first law, it continues its motion horizontally with that velocity. But then, it is also pulled down by earth’s gravity continuously. In this situation its horizontal motion gives way to the parabolic motion until it reaches the ground.

The water level remains the same when the ice cube melts. A floating object displaces an amount of water equal to its own weight. Since water expands when it freezes, one ounce of frozen water has a larger volume than one ounce of liquid water.

The normal force is equal to your apparent weight. So, you actually feel a little heavier than usual when the elevator accelerates upward, and lighter than usual when the acceleration is down.

It is clear that an angle of deviation has the minimum value ‘dm’ for only one value of the angle of incidence. The minimum value of the angle of deviation when a ray of light passes through a prism is called the angle of minimum deviation.

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