Heat Test - 2...

The door of a running refrigerator inside a closed room was left open. Which of the following observations will be seen?

At what temperature do both the centigrade and fahrenheit thermometers show the same reading?

A liquid coefficient of volume expansion γ is filled in a container of a material having the coefficient of linear expansion α. If the liquid overflows on heating, then

A glass flask is filled up to a mark with 50 ccof mercury at \(18^{\circ} \mathrm{C}\). If the flask and content are heated to \(38^{\circ} \mathrm{C}\), how much mercury will be above the mark? ( \(\alpha\) for glass is \(9 \times 10^{-6} / C\) and coefficient of real expansion of mercury is \(180 \times 10^{-6} / C\)

Which of the following conditions enables heat to flow from one body to another identical body?

The coefficient of volume expansion of mercury is 20 times the coefficient of linear expansion of glass. If the volume of mercury that must be poured into a glass vessel of volume V so that the volume above mercury may remain constant at all temperature is $\frac{xV}{20}$. Find x.

A steel scale is correct at 0°C, the length of a brass tube measured by it at 40°C is 5m. The correct length of the tube at 0°C is (Coefficients of linear expansion of steel and brass are 11 × 10^-6 /°C and 19 × 10^-6/°C respectively).

The coefficient of linear expansion 'α' of a rod of length 2m varies with the distance x from the end of the rod as α = α₀ + α₁x where α₀ = 1.76 × 10^-5-1 and α₁ = 1.2 × 10^-6 m^-1-1. The increase in the length of the rod, when heated through 100 is :-

What is the range of a clinical thermometer?

Thermometer A and B have ice points marked at 15° and 25° and steam points at 75° and J 25° respecti vely. When thermometer A measures the temperature of a bath as 60°, the reading ofB for the same bath is

A black body is at \((727)^{0} C\). It emits energy at a rate which is proportional to:

A steel scale measures the length of a copper rod as \(l_{0}\) when both are at \(20^{\circ} C\), the calibration temperature for the scale. The scale reading when both are at \(40^{\circ} \mathrm{C}\), is

The volume of a metal sphere increases by 0.24%  when its temperature is raised by 40. The coefficient of linear expansion of the metal is:

If two identical spheres of same radii R out of which one is hollow containing air and the other is solid are heated through the same temperature range, then the change in dimensions of the spheres will be

A crystal has a coefficient .Of expansion 13 × 10^-7 in one direction and 231 × 10^-7 in every direction at right angles to it. Then the cubical coefficient of expansion is

The difference between the two temperatures in Celsius scale is 100°. Then the difference between their corresponding Fahrenheit scales is

How many parts does a Celsius scale have?

Two bars of same length and same cross-sectional area but of different thermal conductivities \(K_{1}\) and \(K_{2}\) are joined end to end as shown in the figure. One end of the compound bar is at temperature \(T_{1}\) and the opposite end at temperature \(t_{2}\) (where \(T_{1}>T_{2}\) ). the temperature of the junction is

Gaps are left between railway tracks because:

The time period of a pendulum is given by T = $2\mathrm{\pi }\sqrt{\frac{1}{\mathrm{g}}}$ if the temperature rises by △θ  and coefficient of linear expansion of the wire is α, find out the change in time period is: