Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 9

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Weekly Quiz Competition

Question 1
4 / -1

A, B and C are three identical conductors but made from different materials. They are kept in contact as shown. Their thermal conductivites are k, 2k and k/2. The fee and of A is at 100^oC and the free end of C is 0^oC. During steady state, the temperature of the junction of A and B is nearly

A
37°C

B
71°C

C
29°C

D
63°C
Question 2
4 / -1

A composite block is made of slabs A, B, C, D and E of different thermal conductivities (given in terms of a constant K) and sizes (given in terms of length L) as shown in the figure. All slabs are of same width. Heat Q flows only from left to right through the blocks. Then, in steady state

A
(a) heat flow through A and E slabs are same

B
(b) heat flow through slab E is maximum

C
(c) temperature difference across slab E is smallest

D
(d) heat flow through C = heat flow through B + heat flow through D
Question 3
4 / -1

Three identical rods A, B and C are placed end to end. A temperature difference is maintained between the free ends of A and C. The thermal conductivity of B is thrice that of C and half of that of A. The effective thermal conductivity of the system will be (K_A is the thermal conductivity of rod A)

A

B

C

D
Question 4
4 / -1

1.56 × 10⁵ J of heat is conducted through is 2 m² wall of 12 cm thick in one hour. Temperature difference between the two sides of the wall is 20°C. The thermal conductivity of the material of the wall is (in Wm^-1 K^-1)

A
0.11

B
0.13

C
0.15

D
1.2
Question 5
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 0 along the length x of the bar from its hot end is best described by which of the following figure?

A

B

C

D
Question 6
4 / -1

Two rods of equal lengths and areas of cross-section are kept parallel and hanged between temperatures 20°C and 80°C.The ratio of the effective thermal conductivity to that of the first rod is

A
7 : 4

B
7 : 6

C
4 : 7

D
7 : 8
Question 7
4 / -1

For an opaque body, coefficient of transmission is

A
zero

B
1

C
0.5

D
∞
Question 8
4 / -1

Two rods of the same length and diameter having thermal conductivities K₁ and K₂ are joined in parallel. The equivalent thermal conductivity of the combination is

A

B

C

D
Question 9
4 / -1

Two slabs A and B of equal surface area are placed one over the other such that their surfaces are completely in contact. The thickness of slab A is twice that of B. The coefficient of thermal conductivity of slab A is twice that of B. The first surface of slab A is maintained at 100°C, while the second surface of slab B is maintained at 25°C. The temperature at the contact of their surfaces is

A
62.5° C

B
45° C

C
55° C

D
85° C
Question 10
4 / -1

Which of the following circular rods (given radius r and length I), each made of the same material as whose ends are maintained at the same temperature will conduct most heat?

A
r = 2r₀, l = 2l₀

B
r = 2r₀, l = l₀

C
r = r₀, l = l₀

D
r = r₀, l = 2l₀