Properties of Bulk Matter Test - 2

If the difference in temperature on the two sides of a wall increases from 100^oC to 200^oC, its thermal conductivity

A square wire frame of size L is dipped in a liquid. On taking it out, a membrane is formed. If the surface tension of the liquid is T, then the force acting on the frame will be

A wire of length 2 m is made from 10 cc of copper. A force F is applied so that its length increases by 2 mm. Another wire of length 8 m is made from the same volume of copper. If the force F is applied to it, its length will increase by

In which mode of transmission do heat waves travel along a straight line with the speed of light?

If a liquid does not wet a glass, then its angle of contact is

In the following question, a statement of assertion is given, followed by a corresponding statement of reason just below it. Mark the correct answer as

(a) if both assertion and reason are true, and the reason is the correct explanation of the assertion
(b) if both assertion and reason are true, but the reason is not the correct explanation of the assertion
(c) if assertion is true, but reason is false
(d) if both assertion and reason are false

Assertion: It is hotter over the top of fire than at the same distance on the sides.
Reason: Air surrounding the fire conducts more heat upwards.

A copper bar of length 1 m and cross-sectional area 10 x 10^-2 m² has its one end maintained at 100^oC by means of 0.4 kW electric heater. What is the temperature of the other end in steady state, given that the thermal conductivity of copper is 400 W/mK?

The ice and steam point have values 32 ∘F and 212 ∘F respectively, on the Fahrenheit scale. Corresponding values on the Centigrade scale are

In streamline flow of a liquid, the total energy of the liquid is constant at

Which of these materials has low coefficient of volume expansion α_V ?

If the radius of a soap bubble is four times that of another, then the ratio of their excess pressures will be

Two small drops of mercury, each of radius 'r', form a single large drop. The ratio of surface energy before and after this change will be

A spinner swings a cricket ball due to 

A beaker is completely filled with water at 4^oC. It will overflow if it is