Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 61

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Question 1
4 / -1

The dimensions of thermal resistance are

A

B

C

D

Solution
Question 2
4 / -1

A piece of glass is heated to a high temperature and then allowed to cool. If it cracks, a probable reason for this is the following property of glass

A
Low thermal conductivity

B
High thermal conductivity

C
High specific heat

D
High melting point
Question 3
4 / -1

Two walls of thickness d₁ and d₂ and thermal conductivities k₁ and k₂ are in contact. In the steady state, if the temperature at the outer surfaces are T₁ and T₂, the temperature at the common wall is

A

B

C

D

Solution
Question 4
4 / -1

The temperature gradient in a rod of 0.5 m long is 80^oC/m. If the temperature of hotter end of the rod is 30^oC, then the temperature of the cooler end is

A
40^oC

B
–10^oC

C
10^oC

D
0^oC

Solution
Question 5
4 / -1

A wall has two layers A and B made of different materials. The thickness of both the layers is the same. The thermal conductivity of A and B are K_A and K_B such hat K_A = 3K_B. The temperature across the wall is 20^oC. In thermal equilibrium

A
The temperature difference across A = 15^oC

B
The temperature difference across A = 5^oC

C
The temperature difference across A = 10^oC

D
The rate of transfer of heat through A is more than that through B

Solution
Question 6
4 / -1

Ice formed over lakes has

A
Very high thermal conductivity and helps in further ice formation

B
Very low conductivity and retards further formation of ice

C
It permits quick convection and retards further formation of ice

D
It is very good radiator
Question 7
4 / -1

Two rods of same length and material transfer a given amount of heat in 12 sec, when they are joined end to end. But when they are joined lengthwise, then they will transfer same heat in same conditions in

A
24 s

B
3 s

C
1.5 s

D
48 s

Solution
Question 8
4 / -1

Wires A and B have identical lengths and have circular cross–sections. The radius of A is twice the radius of B i.e., r_A = 2r_B. For a given temperature difference between of two ends, both wires conduct heat at the same rate. The realtion between the thermal conductivities is given by

A
K_A = 4K_B

B
K_A = 2K_B

C
K_A = K_B/2

D
K_A = K_B/4

Solution
Question 9
4 / -1

Two identical plates of different metals are joined to form a single plate whose thickness is double the thickness of each plate. If the coefficients of conductivity of each plate are 2 and 3 respectively, then the conductivity of composite plate will be

A
5

B
2.4

C
1.5

D
1.2

Solution
Question 10
4 / -1

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^oC and 200W/m^oC, respectively. After steady state is reached, the temperature of the interface will be

A
45^oC

B
90^oC

C
30^oC

D
60^oC

Solution