Physics Practice Tests – Heat Energy and Measurement of Temperature

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A metal rod of length 50 cm is heated from 40oC to 50oC. If the linear expansivity of the material is ∝, calculate the increase in length of the rod (in metres) in terms of ∝.

A. 20 ∝     B. 200 ∝     C. 2000 ∝     D. 20000 ∝.

Which of the following values on the absolute scale of temperature is the ice point?

A. 0 K     B. 32 K     C. 100 K    D. 273 K

An electric drill rated 400 W is used to drill a hole in copper of mass 400 g in 20 s. Calculate the rise in temperature if all the heat produced is absorbed by the copper. [Specific heat capacity of copper = 400 Jkg-1K-1 ].

A. 100°C     B. 8.75°C      C. 50°C     D. 45°C

It takes a shorter time for a liquid to boil at the top of a mountain than at the base because at the top, the ______

A. temperature is higher
B. pressure is lower
C. humidity is higher
D. temperature a constant.

ln a thermos flask, heat loss by radiation is minimized by the ____

A. silvered surfaces.
B. vacuum within the double walls.
C. plastic stopper.
D. cork support.

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