MEDIUM
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What is the main agent responsible for chemical weathering in rocks?
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Important Questions on Limits and Derivatives
EASY
A copper rod of and an aluminum rod of unknown length have their increase in length independent of increase in temperature. The length of aluminum rod is
MEDIUM
A rod, of length at room temperature and uniform area of cross section is made of a metal having coefficient of linear expansion It is observed that an external compressive force is applied on each of its ends, prevents any change in the length of the rod when its temperature rises by Young's modulus, for this metal is:
EASY
If , then the derivative of at is:
MEDIUM
An ideal gas is expanding such that constant. The coefficient of volume expansion of the gas is
EASY
Two systems are in thermal equilibrium. The quantity which is common for them is
EASY
In an experiment, a sphere of aluminium of mass is heated up to . Immediately, it is put into water of volume at kept in a calorimeter of water equivalent to . The final temperature of the system is . The specific heat of the aluminium is(take )
MEDIUM
If where is a constant, when is stationary, is equal to -
EASY
State the unit and dimensions of coefficient of convection?
MEDIUM
It is hotter at the same distance over the top of a fire than it is on the side of it, mainly because :
EASY
Why convection cannot take place in a solid?
EASY
Explain why felt rather than air is used for thermal insulation even though the thermal conductivity of air is less than that of felt?
MEDIUM
Ventilators are provided in rooms just below the roof. Why?
EASY
An ordinary electric fan does not cool the air; still, it gives comfort in summer. Explain.
EASY
Which method of heat transfer depends on gravity?
EASY
In which of the following process, convection does not takes place primarily?
MEDIUM
A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is
EASY
Permanent winds blowing toward the equator are called _____.
EASY
Assertion: It is hotter over the top of fire than at the same distance on the sides.
Reason: Air surrounding the fire conducts more heat upwards.
MEDIUM
Trade wind is an example of which of these?
EASY
The equatorial and polar regions of the earth receive unequal solar heat. The convection current arising due to this is called:
