Broadcasting antennas are generally
|
(a) Omnidirectional type |
(b) Vertical type |
(c) Horizontal type |
(d) None of these |
Broadcasting antennas are generally
|
(a) Omnidirectional type |
(b) Vertical type |
(c) Horizontal type |
(d) None of these |
(b) Vertical type
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$\frac{\lambda}{4}$
$\frac{\lambda}{3}$
$\frac{\lambda}{2}$
$\lambda.$
A circular coil of mean radius of 7 cm and having 4000 turns is rotated at the rate of 1800 revolutions per minute in the earth's magnetic field (B = 0.5 gauss), the maximum e.m.f. induced in coil will be
|
(a) 1.158 V |
(b) 0.58 V |
(c) 0.29 V |
(d) 5.8 V |
At the magnetic poles of the earth, a compass needle will be
|
(a) Vertical |
(b) Bent slightly |
|
(c) Horizontal |
(d) Inclined at 45o to the horizontal |
Two sources of equal emf are connected to an external resistance R. The internal resistances of the two sources are and
. If the potential difference across the source having internal resistance
is zero, then
|
(a) |
(b) |
|
(c) |
(d) |
A toroid has number of turns per unit length n, current i, then the magnetic field is
|
(a) |
(b) |
(c) |
(d) None of these |
A thin lens is made with a material having refractive index $\mu=1.5.$ Both the sides are convex. It is dipped in water $(\mu=1.33).$ It will behave like:
The line joining the pole and the centre of curvature of a mirror is called the: