Question 1 :
What is the name of the process of heat transfer using electromagnetic waves?
Question 2 :
When 60 calories of heat are supplied to 15 g of water, the rise in temperature is
Question 4 :
In experiment of convection heat transfer, water inside the pipe is heated by which of the following principles,
Question 5 :
The correct relation between the intensity of radiations ($l$) and distance ($d$) from the point source is<br/>
Question 8 :
State True or False :<br/>More we increase the temperature, more is the thermal expansion of solids.
Question 9 :
In which mode of transfer of heat molecules pass on heat energy to neighbouring molecules without actually moving from their positions?
Question 10 :
We consider the radiation emitted by the human body, which of the following statements is true?
Question 11 :
The amount of heat required to change $1$ gm of a substance at its melting point into liquid state without any rise in temperature is called :
Question 15 :
The mode of transfer of heat which requires no medium, is called as:
Question 16 :
Two metallic blocks $P$ and $Q$ of masses in ratio $2 : 1$ are given same amount of heat. If their temperature rise by same amount, compare their specific heat capacities.
Question 18 :
The thermos bottles have a highly polished interior made of stainless steel, which makes them almost unbreakable. These thermos bottles also covered with insulated material to keep substances hot by reducing heat loss. Identify which of the following mode of heat transfer is restricted by the insulated material ?
Question 19 :
A can is taken out from a refrigerator at $0^{\circ}C$. The atmospheric temperature is $25^{\circ}C$. If $t_{1}$ is the time taken to heat from $0^{\circ}C$ to $5^{\circ}$ and $t_{2}$ is the time taken from $10^{\circ}C$ to $15^{\circ}C$, then
Question 20 :
We have 20 Kg of a block of a substance at its melting point. The substance has a latent heat of fusion of 1500 Joules per kilogram and a specific heat at of 2500 Joules per kilogram degree Celcius. How much heat is needed to change the block entirely into a liquid?
Question 21 :
The rate of cooling at $600K$,if surrounding temperature is $300K$ is H. The rate of cooling at $900K$ is:
Question 22 :
The intensity of radiation emitted by the sun has its maximum value at a wavelength of $510$ nm and that emitted by the North star has the maximum value at $350$ nm. If these stars behave like black bodies, then the ratio of the surface temperatures of the sun and the north star is:
Question 23 :
There is the formation of the layer of snow x cm thick on water, when the temperature of the air is $-\theta ^\circ C$ (less than a freezing point). The thickness of the layer increases from x to y in the time t, then the value of t is given by 
Question 24 :
For an enclosure maintained at 1000K, the maximum radiation occurs at wavelength $\lambda  _{m}$. If the temperature is raised to 2000K, the peak will shift to :
Question 25 :
The pendulum of a clock is made of brass. If the clock keeps correct time at $20^{\circ}C$ .Calculate how many seconds per day will it loose at   $35^{\circ}C$ $(\alpha $ for brass =$2 \times$ <br> $10^{-5} $ <br> $^oC$)
Question 26 :
The rate of loss of heat by radiation from a body at $400^oC$ is $R$. The radiation from it when the temperature rises to $800^oC$ is<br/>
Question 27 :
Temperature of earth's atmosphere in absence of green house gases in it:
Question 29 :
2000 cal of heat is supplied to 200 g of water. Find the rise in temperature. (Specific heat of water $=1 cal g^{-1} {\;}^oC^{-1})$
Question 30 :
Two rods A and B of identical dimensions are at temperature $30^o$C. If A is heated upto $180^o$C and B upto $T^o$C, then the new lengths are the same. If the ratio of the coefficients of linear expansion of A and B is $4:3$, then the value of T is?
