- ATelescope
- BMicroscope
- CElectroscope
- DNone of the above
Explanation:
Electroscope is a device that is used for detection and identification of charge on objects.
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The wavelength
of the
line of characteristic X-ray spectra varies with atomic number approximately
|
(a) |
(b) |
(c) |
(d) |
The tail of the comet is due to
|
(a) Vaporisation of water on the comet |
|
(b) Sublimation of vapour in the comet |
|
(c) Cooling of water in the comet |
|
(d) Vaporisation of heat in the comet |
Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

|
(a) |
(b) 4 |
(c) Zero |
(d) |
In the nuclear reaction is
|
(a) |
(b) |
(c) |
(d) |
A wave can transmit ...... from one place to another
|
(a) Energy |
(b) Amplitude |
(c) Wavelength |
(d) Matter |
A beam with wavelength falls on a stack of partially reflecting planes with separation d. The angle q that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n = 1, 2, ……)
|
(a) |
(b) |
(c) |
(d) |