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 charged particle of mass 0.003 gm is held stationary in space by placing it in a downward direction of electric field of 6 . Then the magnitude of the charge is
|
(a) 5 |
(b) 5 |
(c) -18 |
(d) -5 |
A plane mirror reflecting a ray of incident light is rotated through an angle θ about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then
|
(a) The reflected ray rotates through an angle 2θ |
| (b) The incident ray is fixed |
| (c) The reflected ray does not rotate |
| (d) a, b |
A thin lens made of glass of refractive index m = 1.5 has a focal length equal to 12 cm in air. It is now immersed in water Its new focal length is
|
(a) 48 cm |
(b) 36 cm |
(c) 24 cm |
(d) 12 cm |
A straight wire carrying a current 10 A is bent into a semicircular arc of radius 5 cm. The magnitude of magnetic field at the center is
|
(a) 1.5 |
(b) 3.14 |
(c) 6.28 |
(d) 19.6 |