If fa and ff represent the carrier wave frequencies for amplitude and frequency modulations respectively, then
|
(a) |
(b) |
(c) |
(d) |
If fa and ff represent the carrier wave frequencies for amplitude and frequency modulations respectively, then
|
(a) |
(b) |
(c) |
(d) |
(b)
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Two capacitors of equal capacity are first connected in parallel and then in series. The ratio of the total capacities in the two cases will be
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10–7 ohm–meter and the current passing through it is 0.1 ampere; cross-section of the wire is 10–6 m2. The potential gradient along the potentiometer wire is
|
(a) |
(b) |
(c) |
(d) |
A man with defective eyes cannot see distinctly object at the distance more than 60 cm from his eyes. The power of the lens to be used will be
|
(a) + 60 D |
(b) – 60 D |
(c) – 1.66 D |
(d) |
The clear sky appears blue because:
Two light sources are said to be coherent if they are obtained from
|
(a) Two independent point sources emitting light of the same wavelength |
|
(b) A single point source |
|
(c) A wide source |
|
(d) Two ordinary bulbs emitting light of different wavelengths |
In hydrogen atom, if the difference in the energy of the electron in n = 2 and n = 3 orbits is E, the ionization energy of hydrogen atom is
|
(a) 13.2 E |
(b) 7.2 E |
(c) 5.6 E |
(d) 3.2 E |
A point object is placed at the center of a glass sphere of radius 6 cm and refractive index 1.5. The distance of the virtual image from the surface of the sphere is
|
(a) 2 cm |
(b) 4 cm |
(c) 6 cm |
(d) 12 cm |