Question 3 :
Suppose in a clinical thermometer, the difference between first and second bigger marks is $1^o$ and there are 5 small divisions between them theneach small division refers to the difference in scale of:

Question 4 :
In convection process rate of heat transfer is compared in the optionbetween gas and liquid,choose the correct statement

Question 5 :
In experiment of convection heat transfer water inside the pipe, completely gets heated (with the application of heat source) can be explained best by which of the following statements,

Question 7 :
Which of the following is not a valid reason for using cotton clothes in Summer ?

Question 9 :
Inside human body ,which of the following is responsible for heat transfer,

Question 11 :
Which of the following mode of heat transfer involves movement of particles?

Question 12 :
Two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness, because they :

Question 13 :
Which of the following is a wrong pair of clothes worn during a particular season ?

Question 14 :
__________thermometers include two different metals that are bonded together and expand at different rates as they warm up.

Question 15 :
Assertion: Air is a bad conductor of heat. Reason: It's molecules are in Brownian motion.

Question 16 :
Assertion: Snow is better insulator than ice. Reason: Snow contain air packet and air is good insulator of heat.

Question 17 :
In experiment of convection heat transfer, water inside the pipe can be convectively heated with higher rate by

Question 18 :
Assertion: Two thin blankets put together are warmer than a single blanket of double the thickness. Reason: Thickness increases because of air layer enclosed between the two blankets.

Question 20 :
Assertion: Two thin blankets put together are warmer than a single blanket of double the thickness. Reason: Air gets trapped between two blanket which is a bad conductor of heat.

Question 21 :
The  amount  of  heat  supplied  to 4 X ${ 10 }^{ -2 }$  kg  of nitrogen at room temperature to rise its temperature by  $50C$ at constant pressure is  (Molecular mass of nitrogen is $28$ and $R = 8.3 J$ ${ mol }^{ -1 } { K }^{ -1 })$

Question 23 :
Assertion: Temperatures near the sea coast are moderate. Reason: Water has a high thermal conductivity.

Question 25 :
A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile

Question 27 :
It is hotter over the top of a fire than at the same distance on the sides because of

Question 28 :
Assertion: A man would feel iron or wooden balls equally<br>hot at $98.4F$. Reason: At $98.4F$ both iron and wood have the same thermal<br>conductivity.

Question 31 :
Assertion: Though air is a bad conductor yet a body kept in air loses heat quickly.<br/> Reason: The heat loss is mainly due to radiation.

Question 32 :
The steam point and the ice point of a mercury thermometer are marked $80^0$ and $20^0.$&#160; what will be the temperature in centigrade mercury scale when this thermometer reads $32^0$

Question 33 :
Assertion: The equivalent thermal conductivity of two plates of same thickness in contact is less than the smaller value of thermal conductivity Reason: For two plates of equal thickness in contact the equivalent thermal conductivity is given by:<br><br>$\cfrac{1}{K}=\cfrac{1}{K}_{1}+\cfrac{1}{K}_{2}$

Question 34 :
a corked bottle full of water when frozen will break because.

Question 35 :
There are two hollow spheres made of different materials, one with double the radius and one fourth wall thickness of the other are filled with ice. If the time taken for melting the ice completely in larger sphere is $25$ minutes and that for smaller sphere is $16$ minutes, the ratio of the thermal conductivity of the larger sphere to the smaller sphere is :