Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 77

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Weekly Quiz Competition

Question 1
4 / -1

A body cools in a surrounding which is at a constant temperature is θ₀. Assume that it obeys Newton\'s law of cooling. Its temperature θ is plotted against time t. Tangents are drawn to the curve at the points P(θ = θ₂) and Q(θ = θ₁). These tangents meet the time axis at angles of ϕ₂ and ϕ₁, as shown

A

B

C

D

Solution
Question 2
4 / -1

The spectrum of a black body at two temperatures 27^oC and 327^oC is shown in the figure. Let A₁ and A₂ be the areas under the two curves respectively. The value of A₂/A₁ is

A
1 : 16

B
4 : 1

C
2 : 1

D
16 : 1

Solution
Question 3
4 / -1

A block of metal is heated to a temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling?

A

B

C

D

Solution
Question 4
4 / -1

The energy distribution E with the wavelength (λ) for the black body radiation at temperature T kelvin is shown in the figure. As the temperature is increased the maxima will

A
Shift towards left and become higher

B
Rise high but will not shift

C
Shift towards right and become higher

D
Shift towards left and the curve will become broader

Solution
Question 5
4 / -1

For a small temperature difference between the body and the surroundings the relation between the rate of loss heat R and the temperature of the body is depicted by

A

B

C

D

Solution
Question 6
4 / -1

Heat is flowing through a conductor of length l from x = 0 to x = l. If its thermal resistance per unit length is uniform, which of the following graphs is correct?

A

B

C

D

Solution
Question 7
4 / -1

Radius of a conductor increases uniformly from left end to right end as shown fig.
Material of the conductor is isotropic and its curved surface is thermally insulated from surrounding. Its ends are maintained at temperature T₁ and T₂ (T₁ > T₂): If, in steady state, heat flow rate is equal to H, then which of the following graph is correct

A

B

C

D
Question 8
4 / -1

Which of the following graphs correctly represents the relation between ln E and ln T where E is the amount of radiation emitted per unit time from unit area of a body and T is the absolute temperature

A

B

C

D

Solution
Question 9
4 / -1

A hollow copper sphere S and a hollow copper cube C, both of negligible thin walls of same area, are filled with water at 90^oC and allowed to cool in the same environment. The graph that correctly represents their cooling is

A

B

C

D

Solution
Question 10
4 / -1

A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature θ along the length x of the bar from its hot end its best described by which of the following figures

A

B

C

D