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Class XI Physics Thermal Properties of Matter 2

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Question 1

Which of the following would raise the temperature of 20 g of water at 30 °C most, when added to water? (Specific heat of copper is 0.1 calg^–1 °C^–1)

Question 2

Two bars of equal length and the same cross-sectional area but of different thermal conductivities, k₁ and k₂, are joined end-to-end as shown in figure. One end of the composite bar is maintained at temperature T_h whereas the opposite end is held at T_c.

If there are no heat losses from the sides of the bars, the temperature T_j of the junction is given by

Question 3

If the temperature of a body (θ) is slightly more than the temperature of the surrounding (θ₀), then the rate of cooling is correctly represented by –

Question 4

One end of a thermally insulated rod is kept at a temperature T₁ and the other at T₂. The rod is composed of two sections of lengths l₁ and l₂ and thermal conductivities k₁ and k₂ respectively. The temperature at the interface of the two sections is

Question 5

The rate of cooling R with excess of temperature Δθ varies according to the graph-

Question 6

Assuming the Sun to be a spherical body of radius R at a temperature of T K, evaluate the total radiant power, incident on Earth, at a distance r from the Sun.
where r₀ is the radius of the Earth and σ is Stefan’s constant

Question 7

A liquid in a beaker has temperature θ (t) at time t and θ₀ is temperature of surroundings, then according to Newton’s law of cooling the correct graph between log_e (θ - θ₀) and t is

Question 8

A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be

. T is given by.
(Given: room temperature=30^oC, specific heat of copper

)

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Aug 5NEET & AIIMS