- Aampere
- Bvolt
- Cjoule
- Delectron volt
Explanation:
Induced emf is potential difference only, hence its unit is volt only.
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A manufacturer uses a concave lens instead of a convex lens in a magnifying glass by mistake. What will be the effect on the working of the lens?
A convex mirror of focal length f forms an image which is
times the object. The distance of the object from the mirror is
|
(a) (n – 1)f |
(b) |
(c) |
(d) (n + 1)f |
If no external voltage is applied across P-N junction, there would be
|
(a) No electric field across the junction |
|
(b) An electric field pointing from N-type to P-type side across the junction |
|
(c) An electric field pointing from P-type to N-type side across the junction |
|
(d) A temporary electric field during formation of P-N junction that would subsequently disappear |
Two lenses of power +12 and – 2 diopters are placed in contact. What will the focal length of combination
|
(a) 10 cm |
(b) 12.5 cm |
(c) 16.6 cm |
(d) 8.33 cm |
An important spectral emission line has a wavelength of 21 cm. The corresponding photon energy is (h = 6.62 ![]()
|
(a) 5.9 |
(b) 5.9 |
(c) 5.9 |
(d) 11.8 |