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## A steel scale measure the length of a copper wire as 80.0 cm, when both are at 20°C (the calibration temperature for scale)….

Q: A steel scale measure the length of a copper wire as 80.0 cm, when both are at 20°C (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at 40°C? (Given αsteel = 11 × 10-6 per°C and αcopper = 17 × 10-6 per°C)

(a) 80.0096 cm

(b) 80.0272 cm

(c) 1 cm

(d) 25.2 cm

Ans: (a)

## A one litre flask contains certain quantity of mercury. If the volume of air inside the flask remains the same at all temperature…

Q: A one litre flask contains certain quantity of mercury. If the volume of air inside the flask remains the same at all temperature then the volume of mercury in the flask is (volume expansion coefficient of mercury is 20 times that of flask)

(a) 100 cc

(b) 50 cc

(c) 200 cc

(d) 150 cc

Ans: (b)

## If on heating liquid through 80°C, the mass expelled is (1/100)th of mass still remaining, the coefficient of apparent expansion of liquid is

Q: If on heating liquid through 80°C, the mass expelled is (1/100)th of mass still remaining, the coefficient of apparent expansion of liquid is

(a) 1.25 × 10-4/°C

(b) 12.5 × 10-4/°C

(c) 1.25 × 10-5

(d) none of these

Ans: (a)

## The real coefficient of volume expansion of glycerine is 0.000597 per°C and linear coefficient of expansion of glass is 0.000009 per°C…

Q: The real coefficient of volume expansion of glycerine is 0.000597 per°C and linear coefficient of expansion of glass is 0.000009 per°C. then the apparent volume coefficient of expansion of glycerine is

(a) 0.000558 per°C

(b) 0.00057 per°C

(c) 0.00027 per°C

(d) 0.00066 per°C

Ans: (b)

## The coefficient of apparent expansion of a liquid when determined using two different vessels A and B are γ1 and γ2 respectively…

Q: The coefficient of apparent expansion of a liquid when determined using two different vessels A and B are γ1 and γ2 respectively. If the coefficient of linear expansion of the vessel A is α , the coefficient of linear expansion of the vessel B is

(a) $\displaystyle \frac{\alpha \gamma_1 \gamma_2}{\gamma_1 + \gamma_2}$

(b) $\displaystyle \frac{\gamma_1 – \gamma_2}{2 \alpha}$

(c) $\displaystyle \frac{\gamma_1 – \gamma_2 + \alpha}{3}$

(d) $\displaystyle \frac{\gamma_1 – \gamma_2}{3} + \alpha$