Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 67

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Question 1
1 / -0

When a body is placed in surrounding at a constant temperature of $$20^\circ$$C, and heated by a $$10$$-W, heater, its temperature remains constant at $$40^\circ$$C. If the temperature

A
$$3000$$ J

B
$$3600$$ J

C
$$4500$$ J

D
$$5400$$ J

Solution
Question 2
1 / -0

In on heating liquid through $${80}^{o}C$$, the mass expelled is (1/100)th of mass still remaining, the coefficient of apparent expansion of liquid is:

A
$$1.25\times{10}^{-4}/^{o}C$$

B
$$12.5\times{10}^{-4}/^{o}C$$

C
$$1.25\times{10}^{-5}/^{o}C$$

D
None of these

Solution
Question 3
1 / -0

Find the temperature at which the thermometer reads correctly?

A
60C

B
40C

C
50C

D
55C
Question 4
1 / -0

At what temperature is the r.m.s velocity of a hydrogen molecule equal to that of an oxygen molecule at $${47}^{o}C$$?

A
$$80K$$

B
$$-73K$$

C
$$3K$$

D
$$20K$$

Solution
Question 5
1 / -0

Two metal cubes A and B of same size are arranged as shown in the figure. The extreme ends of the combination are maintained at the indicated temperatures. The arrangement is thermally insulated. The coefficients of thermal conductivity of A and B are 300 $$W/m^0C$$ and 200 $$W/m^0C$$, respectively. After steady state is reached, the temperature of the interface will be

A
$$45^0C$$

B
$$90^0C$$

C
$$30^0C$$

D
$$60^0C$$

Solution

Temperature of interface is given by : $$T=\dfrac{K_1\theta_1+K_2\theta_2}{K_1+K_2} $$ $$=\dfrac{300 \times 100+200 \times 0}{300+200}=60 ^\circ C$$
Question 6
1 / -0

Radius of the sun is $$7\times { 10 }^{ 8 }m$$ and the energy radiated by it is $$38\times { 10 }^{ 28 }W$$. Calculate the magnitude of energy propagation poynting vector (i.e., energy flowing per second per unit area) on the surface of sun:-

A
$$6.17\times { 10 }^{ 8 }W/{ m }^{ 2 }$$

B
$$6.17\times { 10 }^{ 9 }W/{ m }^{ 2 }$$

C
$$6.17\times { 10 }^{ 10 }W/{ m }^{ 2 }$$

D
$$6.17\times { 10 }^{ 11 }W/{ m }^{ 2 }$$

Solution
Question 7
1 / -0

Three rods AB,BC and AC having thermal resistances of 10 units, 10 units and 20 units, respectively, are connected as shown in the figure. Ends A and C are maintained at constant temperatures of $$100^{ \circ }C$$ and $$0^{ \circ }C,$$ respectively. The rate at which the heat is crossing junction B is:

A
5 units

B
10 units

C
20 units

D
7.5 units

Solution
Question 8
1 / -0

One end of a 0.25 m long metal bar is in steam and the other end is in contact with ice. If 12 g of ice melts per minute , What is the thermal conductivity of the metal ? Given cross-section of the bar$$=5\times { 10 }^{ -4 }{ m }^{ 2 }$$ and latent heat of ice is 80 cal/g

A
$$80cal/s-{ m- }^{ \circ }$$ C

B
$$90cal/s-{ m- }^{ \circ }$$ C

C
$$70cal/s-{ m- }^{ \circ }$$ C

D
$$60cal/s-{ m- }^{ \circ }$$ C

Solution
Question 9
1 / -0

The value of universal gas constant is $$R=8.3$$ J/K - mol. The value of $$R$$ in atmosphere litre per kelvin mol

A
$$8.12$$

B
$$0.00812$$

C
$$81.2$$

D
$$0.082$$

Solution
Question 10
1 / -0

If the system takes 100 cal. heat, and releases 80 cal to sink, if source temperature is $$127^oC$$ find the sink temperature :-

A
$$47^oC$$

B
$$127^oC$$

C
$$67^oC$$

D
$$107^oC$$