A thermometer has wrong calibration. It reads the melting point of ice as - 10o C, the temperature of boiling point of water on this scale is :
-20o C
-40o C
-10o C
-10.7o C
A piece of blue glass heated to a high temperature and a piece of red glass at room temperature, are taken inside a dimly lit room, then :
The blue piece will look blue and red will look as usual
Red looks brighter red and blue looks ordinary blue
Blue shines like brighter red compared to the red piece
Both the pieces will look equally red.
If boiling point of water is 95oF, what will be reading at Celsius scale ?
7oC
65oC
63oC
35oC
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 temperature of the sun and the North Star is :
1.46
0.69
1.21
0.83
The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by
Planck's law of radiation
Stefan's law of radiation
Rayleigh Jeans law
Wien's law
An ungraduated thermometer of uniform bore is attached to a centimetre scale and is found to read 10.3 cm in melting ice, 26.8 cm in boiling water and 6.5 cm. in freezing mixture. The temperature of the freezing mixture will be :
-23.003o C
-23.03o C
-23.3o C
-23.33o C
Which one of the following processdepends up on gravity ?
Conduction
Convection
Radiation
Accumulation
The temperature coefficient of resistance of a wire is 0.00125oC-1. At 300 K, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at which temperature ?
1,154 K
1,100 K
1,400 K
1,127 K
The unit of Stefan's constant :
Wm-2K-1
WmK-4
Wm-2K-4
Nm-2K-4
A black body at a temperature of 227oC radiates heat at the rate of 20 cal m-2s-1. When its temperature rises to 727oC, the rate of heat radiated will be :
40 cal m-2s-1
160 cal m-2s-1
320 cal m-2s-1
640 cal m-2s-1