- ATroposphere
- BIonosphere
- CStratosphere
- DMesosphere
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X-rays are produced due to
| (a) Break up of molecules | (b) Changing in atomic energy level |
| (c) Changing in nuclear energy level | (d) Radioactive disintegration |
A straight wire of length ( metre is carrying a current of 2A and the magnetic field due to it is measured at a point distant 1 cm from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be
|
(a) 50 : 1 |
(b) 1 : 50 |
(c) 100 : 1 |
(d) 1 : 100 |
Calculate the equivalent resistance between A and B
|
(a) |
(b) 3 W |
(c) 6 W |
(d) |
A glass slab is placed in the path of beam of convergent light. The point of convergence of light:
The angle of polarisation for any medium is 60o, what will be critical angle for this
|
(a) |
(b) |
(c) |
(d) |
The lines of forces due to earth's horizontal component of magnetic field are
| (a) Parallel straight lines | (b) Concentric circles |
| (c) Elliptical | (d) Parabolic |
A uniform magnetic field acts at right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of the electrons is doubled, then the radius of the circular path will be
|
(a) 2.0 cm |
(b) 0.5 cm |
(c) 4.0 cm |
(d) 1.0 cm |
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 |