A moving coil sensitive galvanometer gives at once much more deflection. To control its speed of deflection
|
(a) A high resistance is to be connected across its terminals |
|
(b) A magnet should be placed near the coil |
|
(c) A small copper wire should be connected across its terminals |
|
(d) The body of galvanometer should be earthed |
(b) A magnet should be placed near the coil
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An electric charge q is placed at the centre of a cube of side α. The electric flux on one of its faces will be
|
(a) |
(b) |
(c) |
(d) |
Venus appears brighter than other stars because
|
(a) It is heavier than other planets |
|
(b) Its density is more than other planets |
|
(c) It is nearer to earth in comparison to other planets |
|
(d) Nuclear fusion takes place at its surface |
A helium nucleus makes a full rotation in a circle of radius 0.8 metre in two seconds. The value of the magnetic field B at the centre of the circle will be
|
(a) |
(b) |
(c) 2 |
(d) |
In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following would be emitted in the decay process
|
(a) Proton |
(b) Neutron |
(c) Electron |
(d) Photon |
The X-ray wavelength of 
line of platinum (Z=78) is 1.30 
The X –ray wavelength of line of Molybdenum (Z = 42) is
|
(a) 5.41Å |
(b) 4.20Å |
(c) 2.70Å |
(d) 1.35 Å |
Electronic configuration of germanium is 2, 8, 18 and 4. To make it extrinsic semiconductor small quantity of antimony is added
|
(a) The material obtained will be N-type germanium in which electrons and holes are equal in number |
|
(b) The material obtained will be P-type germanium |
|
(c) The material obtained will be N-type germanium which has more electrons than holes at room temperature |
|
(d) The material obtained will be N-type germanium which has less electrons than holes at room temperature |
