A thermoelectric refrigerator works on
|
(a) Joule effect |
(b) Seeback effect |
(c) Peltier effect |
(d) Thermonic emission |
A thermoelectric refrigerator works on
|
(a) Joule effect |
(b) Seeback effect |
(c) Peltier effect |
(d) Thermonic emission |
(c) Peltier effect
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A light source approaches the observer with velocity 0.8 c. The doppler shift for the light of wavelength 5500 Å is
|
(a) 4400 Å |
(b) 1833 Å |
(c) 3167 Å |
(d) 7333 Å |
The ratio of secondary to the primary turns in a transformer is 3 : 2. If the power output be P, then the input power neglecting all loses must be equal to
|
(a) 5 P |
(b) 1.5 P |
(c) P |
(d) |
The relative permeability (
of a ferromagnetic substance varies with temperature (T) according to the curve

|
(a) A |
(b) B |
(c) C |
(d) D |
The refractive index of a prism for a monochromatic wave is and its refracting angle is 60°. For minimum deviation, the angle of incidence will be
|
(a) 30° |
(b) 45° |
(c) 60° |
(d) 75° |
One Tesla is equal to
|
(a) |
(b) |
(c) |
(d) |