The current inside a copper voltameter
|
(a) Is half the outside value |
(b) Is the same as the outside value |
|
(c) Is twice the outside value |
(d) Depends on the concentration of |
(b) Is the same as the outside value
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A step up transformer connected to a 220 V AC line is to supply 22 kV for a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 mA. The turn ratio of the transformer is
|
(a) 50 |
(b) 100 |
(c) 150 |
(d) 200 |
In hydrogen atom, the electron makes 6.6 
revolutions per second around the nucleus in an orbit of radius 0.5 
. It is equivalent to a current nearly
|
(a) 1 A |
(b) 1 mA |
(c) 1 μA |
(d) 1.6 |
Sum of the two binary numbers 
and 
is
|
(a) |
(b) |
(c) |
(d) |
The angle of dip at a place is 60°. At this place the total intensity of earth's magnetic field is 0.64 units. The horizontal intensity of earth's magnetic field at this place is
| (a) 1.28 units |
(b) 0.64 units |
(c) 0.16 units | (d) 0.32 units |
The essential distinction between X-rays and γ - rays is that
| (a) γ- rays have smaller wavelength than X-rays |
|
(b) γ - rays emanate from nucleus while X-rays emanate from outer part of the atom |
| (c) γ- rays have greater ionizing power than X-rays |
| (d) γ- rays are more penetrating than X-rays |
A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is
|
(a) |
(b) |
(c) |
(d) |
