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NEET Physics : Thermal Properties of Matter

Multiple Choice Questions

31.

The temperature of the black body increases from T to 2T. The factor by which the rate of emission will increase, is?

32.

Two rods of same material have same length and area. The heat ΔQ flows through them for 12 minutes when they are joint side by side. If now both the rods are joined in parallel, then the same amount of heat ΔQ will flow in :

24 min
3 min
12 min
6 min

33.

Which of the following circular rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?

r = 2r_o, l = 2l_o
r = 2r_o, l = l_o
r = r_o, l = l_o
r = r_o, l = l_o

34.

The temperature of inversion of a thermocouple is 620°C and the neutral temperature is 300^oC, what is the temperature of cold junction?

20^o C
320^o C
-20^o C
40^o C

35.

Mercury boils at 367^oC. However, mercury thermometers are made such that they can measure temperature upto 500^oC. This is done by

maintaining vacuum above mercury column in the stem of the thermometer
filling nitrogen gas at high pressure above the mercury column
filling oxygen gas at high pressure above the mercury column
filling nitrogen gas at low pressure above the mercury column

36.

Which of the following circular rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?

r = 2r_o ; l = 2 l_o
r = 2r_o ; l = l_o
r = r_o ; l = l_o
r = r_o ; l = l_o

37.

Consider a compound slab consisting of two different materials having equal lengths, thicknesses and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

$\sqrt{2} K$
3 K
$\frac{4}{3} K$
$\frac{2}{3} K$

38.

A black body has a wavelength of A at temperature 2000 K. Its corresponding wavelength at temperature 3000 K will be

$\frac{2 λ}{3}$
$\frac{3 λ}{2}$
$\frac{4 λ}{9}$
$\frac{9 λ}{4}$

39.

The temperature of the sun can be found out by using

Wien's displacement law
Kepler's law of motion
Stefan's Boltzmann law
Planck's law

40.

The thermo emf of a hypothetical thermocouple varies with the temperature θ of hot junction as E = $a θ + b θ^{2}$ in volts, where the ratio $\frac{a}{b}$ is 700^o C. If the cold junction is kept at 0^o C, then the neutral temperature is

700^o C
1400^o C
390^o C
no neutral temperature is possible for this thermocouple

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NEET Physics : Thermal Properties of Matter

Multiple Choice Questions