Thermodynamics-Measurement of Temperature (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 4 - 6 of 7

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Question number: 4

» Thermodynamics » Measurement of Temperature

MCQ▾

Question

Two rods, one made of Aluminum and the other copper of the same length and across sectional area are joined together. (The thermal conductivity of copper is 385Js1m1K1 and aluminum is 205Js1m1K1 ). If the copper end is held at 1300 C and the aluminum end is held at 50 C, what is the junction temperature (assuming no other heat losses)?

Choices

Choice (4) Response

a.

55.60 C

b.

86.60 C

c.

1000 C

d.

88.70 C

Question number: 5

» Thermodynamics » Measurement of Temperature

MCQ▾

Question

A steel rod (L1 = 10 cm, A1 = 0.02 m2 and k1 = 50 J s-1 m-1 K-1) is welded to a silver rod (L2 = 20 cm, A2 = 0.01 m2, k2 = 400 J s-1 m-1 K-1) as shown in figure below. The ends of the composite rod are maintained at 1500 C and 00 C. The rod is covered with an insulating material so that the heat loss from the sides is negligible. Compute the temperature of the steel-silver junction in the steady state.

Two rods of different metals welded

Two Rods of Different Metals Welded

In figure a steel rod is welded to a silver rod is shown. The ends of the composite rod are maintained at 200 (Degree) C and 0 (Degree) C.

Choices

Choice (4) Response

a.

700 C

b.

1500 C

c.

500 C

d.

1000 C

Question number: 6

» Thermodynamics » Measurement of Temperature

Appeared in Year: 2013

MCQ▾

Question

A metallic prong consists of 4 rods made of the same material, cross-section and same lengths as shown. The three forked ends are kept at 1000 C and the handle end is at 00C. The temperature of the junction is

A metallic prong consists of 4 rods

A Metallic Prong Consists of 4 Rods

In figure a metallic prong consists of 4 rods made of the same material, cross-section and same lengths.

Choices

Choice (4) Response

a.

500C

b.

250C

c.

750 C

d.

600 C

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