If cathode rays are projected at right angles to a magnetic field, their trajectory is
|
(a) Ellipse |
(b) Circle |
(c) Parabola |
(d) None of these |
(b) Circle
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A 36 W galvanometer is shunted by resistance of 4W. The percentage of the total current, which passes through the galvanometer is
|
(a) 8 % |
(b) 9 % |
(c) 10 % |
(d) 91 % |
Atom bomb consists of two pieces of 
and a source of
|
(a) Proton |
(b) Neutron |
(c) Meson |
(d) Electron |
In a hydrogen atom, an electron moves in a circular orbit of radius 5.2 
and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be (Given 
|
(a) 6.53 |
(b) 13.25 |
|
(c) 9.6 |
(d) 1.04 |
The terminal potential difference of a cell when short-circuited is (E = E.M.F. of the cell)
|
(a) E |
(b) E/2 |
(c) Zero |
(d) E/3 |
Television signals broadcast from the moon can be received on the earth while the TV broadcast from Delhi cannot be received at places about 100 km distant from Delhi. This is because
|
(a) There is no atmosphere around the moon |
|
(b) Of strong gravity effect on TV signals |
|
(c) TV signals travel straight and cannot follow the curvature of the earth |
|
(d) There is atmosphere around the earth |
In a transistor circuit shown here the base current is 35 mA. The value of the resistor Rb is
| (a) 123.5 kW | (b) 257 kW | (c) 380.05 kW | (d) None of these |
Radius of central zone of circular zone plate is 2.3 mm. Wavelength of incident light is 5893
. Source is at a distance of 6m Then the distance of first image will be
|
(a) 9 m |
(b) 12 m
|
(c) 24 m |
(d) 36 m |
