Question
Consider the following statements: Â Assertion
(A): During the winter season, a glass breaks when hot water it poured into it. Reason (R): The exterior surface of the glass material undergoes expansion when it comes in contact with the hot water.Solution
When during the winter season, hot water is poured in the glass, its inner surface undergoes expansion while the exterior surface which is in contact with cold atmosphere does not expand. This opposite interaction causes the glass surface to break. Thus, (A) is true, but (R) is false. Hence, the correct answer is (C).
Find the force exerted on a body of mass 2 kg moving with an acceleration of 3 m/s².
When heated from 0° to 10°C volume of a given mass of water will -
Half-life of a radioactive substance is 10 days. The time after which only 1/16th of it remains is:
A plane mirror is placed on a wall. A man walks directly toward the mirror at 2 m/s. The speed at which his image approaches him is:
Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 12 and the second has a voltage gain o...
A tuning fork of frequency 440 Hz resonates with a pipe closed at one end, vibrating in its second overtone . If the speed of sound in air is 330 m/s, w...
What is the rate of change of momentum called?
Pycnometer is an instrument used to measure the –
In which direction does torque act?
When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance?