- APlane
- BSpherical
- CCylindrical
- DParaboloidal
Explanation:
Wave front formed by the collimator of a spectrometer is a plane wave front, when r lit is in the focus.
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At a point 20 cm from the centre of a uniformly charged dielectric sphere of radius 10 cm, the electric field is 100 V/m. The electric field at 3 cm from the centre of the sphere will be
|
(a) 150 V/m |
(b) 125 V/m |
(c) 120 V/m |
(d) Zero |
The relaxation time in conductors
|
(a) Increases with the increase of temperature |
|
(b) Decreases with the increase of temperature |
|
(c) It does not depend on temperature |
|
(d) All of sudden changes at 400 K |
The wavelength of X-rays is of the order of
|
(a) Centimetre |
(b) Micron (10-6 m) |
(c) Angstrom (10-10 m) |
(d) Metre |
If the mass number of an atom is A = 40 and its electron configuration is
, the number of neutrons and protons in its nucleus will be
| (a) 22, 18 | (b) 18, 22 |
(c) 20, 20 |
(d) 18, 18 |
If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a
|
(a) Current drop |
(b) Potential drop |
(c) No current drop |
(d) No potential drop |