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Revision Quiz | Thermal Properties of Matter & KTG

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Question 1

If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be

Question 2

A body cools from 50 °C to 40 °C in 5 min. If temperature of the surroundings is 20 °C, the temperature of the body after 5 min would be–

Question 3

A block of steel heated to 100 °C is left in a room to cool. Which of the curves shown in fig., represents the correct behavior –

Question 4

Hot water cools from 60 ºC to 50 ºC in the first 10 minutes and to 42 ºC in the next 10 minutes. Then the temperature of the surroundings is

Question 5

A calorimeter (of water equivalent 50g) contains 250g of water and 50g of ice at 0 °C. 30 g of water at 80 °C is added to it. The final condition of the system will be –

Question 6

The accompanying graph shows the variation of temperature (T) of one kilogram material with Heat (Q) supplied to it. At O, the substance is in solid state. Which of the following interpretation from the graph is correct –

Question 7

The temperature of the water of pond is 0 °C and of the air above it -20°C . If the density of ice is ρ, coefficient of thermal conductivity is K and latent heat of melting is L, then the thickness Z of ice layer formed increases as function of time t as

Question 8

Three rods of equal length are joined to form an equilateral triangle ABC. D is midpoint of AB. The coefficient of linear expansion is α1 for AB, and α2 for AC and BC. If the distance DC remains constant for small changes in temperature-

Question 9

A metal sphere of radius r and specific heat s is rotated about an axis passing through its centre at a speed of n rotations per second. It is suddenly stopped and 50% of its energy is used in increasing its temperature. Then the rise in temperature of the sphere is

Question 10

A perfect gas at 27 ºC is heated at constant pressure so as to double its volume. The increase in temperature of the gas will be

Question 11

The temperature of an ideal gas is increased from 120 K to 480 K. If at 120 K, the root mean square speed of gas molecules is υ, then at 480 K it will be

Question 12

What will be the change in the internal energy of the 60 g of gas at 300 K temperature if the ratio of the specific heat of gas at constant volume and at constant pressure is 1/ γ and the volume changes from 3V to 5V at constant pressure?

Question 13

n molecules of an ideal gas are enclosed in cubical box at temperature T and pressure P. If the number of molecules in the box is tripled then new temperature and pressure become T ´ and P ´ respectively, but the total energy of gas system remains unchanged, then -

Question 14

Figure shows a parabolic graph between T and for a mixture of a gas undergoing an adiabatic process. What is the ratio of vrms and speed of sound in the mixture?

Question 15

The work of 146 kJ is performed in order to compress one kilo mole of a gas adiabatically and in this process the temperature of the gas increases by 7 ºC. The gas is ( R = 8.3 J mol-1 K –1)
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Jun 15JEE & BITSAT