# Thermodynamics-Measurement of Temperature (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 1 - 3 of 7

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## Question number: 1

» Thermodynamics » Measurement of Temperature

Appeared in Year: 2011

MCQ▾

### Question

Two rods, one made of copper and the other steel of the same length and cross sectional area are joined together. (The thermal conductivity of copper is 385 J s–1 m –1 K-1 and steel is 50 J s–1 m –1K–1) If the copper end is held at 1000C and the steel end is held at 00C, what is the junction temperature (assuming no other heat losses)?

### Choices

Choice (4) Response

a.

880C

b.

120C

c.

500C

d.

730C

## Question number: 2

» Thermodynamics » Measurement of Temperature

Appeared in Year: 2012

MCQ▾

### Question

A cylindrical steel rod of length 0.10 m and thermal conductivity 50 Wm-1K-1 is welded end to end to copper rod of thermal conductivity 400 Wm-1K-1 and of the same area of cross section but 0.20 m long. The free end of the steel rod is maintained at 1000C and that of the copper rod at 00C. Assuming that the rods are perfectly insulated from the surrounding the temperature at the junction of the two rods is

### Choices

Choice (4) Response

a.

500 C

b.

200 C

c.

400 C

d.

300 C

## Question number: 3

» Thermodynamics » Measurement of Temperature

Appeared in Year: 2014

MCQ▾

### Question

Consider two thermometers T1 and T2 of equal length which can be used to measure temperature over the range θ1 to θ2. T1 contains mercury as the thermometric liquid while T2 contains bromine. The volumes of the two liquids are the same at the temperature θ1. The volumetric coefficients of expansion of mercury and bromine are 18 × 10–5 K–1 and 108 × 10–5 K–1, respectively. The increase in length of each liquid is the same for the same increase in temperature. If the diameters of the capillary tubes of the two thermometers are d1 and d2 respectively, then the ratio d1: d2 would be closest to –

### Choices

Choice (4) Response

a.

0.4

b.

2.5

c.

6.0

d.

0.6

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