Advertisements
Advertisements
प्रश्न
If heat is supplied to a solid, its temperature
(a) must increase
(b) may increase
(c) may remain constant
(d) may decrease
Advertisements
उत्तर
(b) may increase
(c) may remain constant
When heat is supplied to a solid, it is used up either to increase the temperature of the body or to change its state from one form to another by breaking the bonds between the molecules (without raising the temperature).
When heat is supplied to the solid, the internal energy of the solid increases, so the temperature does not decrease.
APPEARS IN
संबंधित प्रश्न
A metal sphere cools at the rate of 4°C / min. when its temperature is 50°C. Find its rate of cooling at 45°C if the temperature of surroundings is 25°C.
The substance which allows heat radiations to pass through is _______.
(A) iron
(B) water vapour
(C) wood
(D) dry air
It is said that mercury is used in defining the temperature scale because it expands uniformly with temperature. If the temperature scale is not yet defined, is it logical to say that a substance expands uniformly with temperature?
The temperature of water at the surface of a deep lake is 2°C. The temperature expected at the bottom is
An aluminium sphere is dipped into water at 10°C. If the temperature is increased, the force of buoyancy
Is heat a conserved quantity?
The atmospheric temperature in the cities on sea-coast change very little. Explain
When a hot liquid is mixed with a cold liquid, the temperature of the mixture ____________ .
The temperature of a solid object is observed to be constant during a period. In this period
(a) heat may have been supplied to the body
(b) heat may have been extracted from the body
(c) no heat is supplied to the body
(d) no heat is extracted from the body
Heat and work are equivalent. This means, ____________ .
A pendulum clock shows correct time at 20°C at a place where g = 9.800 m s–2. The pendulum consists of a light steel rod connected to a heavy ball. It is taken to a different place where g = 9.788 m s–1. At what temperature will the clock show correct time? Coefficient of linear expansion of steel = 12 × 10–6 °C–1.
Answer the following question.
Clearly, state the difference between heat and temperature?
One day in 1922, the air temperature was measured at 59°C in the shade in Libya ______.
Heat is measured in Celsius or centigrade.
Give reasons for the following:
Hot metal ball of 80° C is dipped into water of 80°C. The ball will not contract.
What is the SI unit of heat?
The concept of thermal equilibrium, where heat flows between bodies until they reach the same temperature, is the basis of which law of thermodynamics?
