Thermal properties of matter practice · Mixed difficulty

Can we boil water inside the earth satellite by convection

A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between each sphere and its surroundings is T, then

A solid copper sphere (density $\rho$ and specific heat capacity $c$) of radius $r$ at an initial temperature $200K$ is suspended inside a chamber whose walls are at almost $0K$ . The time required (in $\mu \,s$ ) for the temperature of the sphere to drop to $100\,K$ is

A liquid column of height 80cm at ${0^0}C$ balances the same liquid of height 80.4 cm at 1000C. ${r_R}$ is

Very low temperatures are measured by

A brass wire 1.8 m long at $27^\circ C$ is hold taut with little tension between two rigid supports. If the wire is curled to a temperature of $- 39^\circ C,$ then tension developed in the wire if its diameter is 2.0 mm? $\left( {{\alpha _{{\text{brass}}}} = 2 \times {{10}^{ - 5}}/^\circ C,\,\,{Y_{{\text{brass}}}} = 0.91 \times {{10}^{11}}\,\,{\text{Pa}}} \right)$

The temperature of hot and cold end of a $20cm$ long rod in thermal steady state are at ${100^0}C$ and ${20^0}C$ respectively. Temperature at the centre of the rod is

A faulty thermometer has its lower fixed point marked as $- {10^0}C$ and upper fixed point marked as ${110^0}C$. If the temperature of the body shown in this scale is ${62^0}C$, the temperature shown on the Celsius scale is

Absorption co-efficient of an open window is

On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that

A students performs cooling experiment with a solid sphere and hollow sphere of same material and size which are heated to the same temperature. If the temperature difference between each sphere and surroundings is around $30^{\circ} \mathrm{C}$, then -

A beaker contains 200 g of water. The heat capacity of the beaker is equal to that of 20 g of water. The initial temperature of water in the beaker is ${20^0}C$. If 440 g of hot water at ${92^0}C$ is poured in it, the final temperature (neglecting radiation loss) will be nearest to

Assertion: Liquids usually expand more than solids.
Reason: The intermolecular forces in liquids are weaker than in solids.

Recently, the phenomenon of superconductivity has been observed at $95\,\,K$. This temperature is nearly equal to

A wall has two layers $A$ and $B$, made of two different materials. The thermal conductivity of material $A$ is twice that of $B$. If the two layers have same thickness and under thermal equilibrium, the temperature difference across the wall is ${48^0}C$, the temperature difference across layer $B$ is

A beaker is completely filled with water at ${4^0}C$. It will overflow

A copper cube having a length of 10 cm each side is heated from ${10^ \circ }C$ to ${110^ \circ }C$. If $\alpha = 12 \times {10^{ - 6}}/\,{\,^ \circ }C$ change in volume in c.c. is

A steel ball initially at pressure of ${10^5}Pa$ is heated from ${30^ \circ }C$ to ${130^ \circ }C$ keeping it’s volume constant, the final pressure inside the ball is (coefficient of linear expansion of steel is $1.1 \times {10^{ - 5}}\,{\left( {{C^ \circ }} \right)^{ - 1}}$ and bulk modulus of a steel is $1.6 \times {10^{11}}\,N/{m^2}$)

Two identical vessels $A$ and $B$ with frictionless pistons conatin the same ideal gas at the same temperature and the same volume $V$. The masses of gas in $A$ and $B$ are ${m_A}\;\mathrm{and}\;{m_B}$ respectively. The gases are allowed to expand isothermally to same final volume $2\;V$. The change in pressures of the gas in $A$ and $B$ are found to be $\Delta p\;\mathrm{and}\;1.5\;\Delta p$ respectively. Then

A platinum resistance thermometer reads ${0^0}C$ when its resistance is 80 $\Omega$ and ${100^0}C$ when its resistance is 90$\Omega$. Find the temperature at the platinum scale at which the resistance is 86$\Omega$

The coefficient of superficial expansion of a solid is $2 \times {10^{ - 5}}/{}^ \circ C$. Its coefficient of linear expansion is

A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will

A cylindrical rod having temperature ${T_1}$ and ${T_2}$ at its ends. The rate of flow of heat is ${Q_1}\,\,cal/s$ . If all the linear dimensions are doubled keeping temperature constant then rate of flow of heat ${Q_2}$ will be

If between wavelength $\lambda$ and $\lambda + d\lambda ,{e_\lambda }$ and ${a_\lambda }$ be the emissive and absorptive powers of a body and ${E_\lambda }$ be the emissive power of a perfectly black body, then according to Kirchoff’s law, which is true

Assertion (A): Reading of temperature may be same on Fahrenheit and Kelvin scale.
Reason (R): Size of degree is equal on Fahrenheit and Kelvin scale.

A brass disc fits simply in a hole of a steel plate. The disc from the hole can be loosened if the system

On a hilly region, water boils at ${95^0}C$.The temperature expressed in Fahrenheit is

Statement 1: When two liquid samples of different masses with temperatures $T_1$ and $T_2 \,\left(T_1 < T_2\right)$ but same specific heats are mixed the equilibrium temperature of the mixture is $\frac{T_1+T_2}{2}$
Statement 2: The amount of heat lost by the hotter liquid is equal to the amount of heat absorbed by the cooler liquid.

Two temperature scales A and B are related by $\frac{{A - 42}}{{110}}$ = $\frac{{B - 72}}{{220}}$. At which temperature two scales have the same reading?

The temperature of the sun is measured with