Question
If fa and ff represent the carrier wave frequencies for amplitude and frequency modulations respectively, then
|
(a) |
(b) |
(c) |
(d) |
✓
Answer
(b) 
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The distance CP is the:
Electric conduction in a semiconductor takes place due to:
Let Fpp' Fpn and Fnn fill denote the magnitudes of the nuclear force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively. When the separation is 1fm:
- Fpp > Fpn = Fnn
- Fpp = Fpn = Fnn
- Fpp > Fpn > Fnn
- Fpp < Fpn = Fnn
A candle placed 25 cm from a lens, forms an image on a screen placed 75 cm on the other end of the lens. The focal length and type of the lens should be
|
(a) + 18.75 cm and convex lens |
(b) – 18.75 cm and concave lens |
|
(c) + 20.25 cm and convex lens |
(d) – 20.25 cm and concave lens |
The brightness of a bulb will be reduced, if a resistance is connected in
|
(a) Series with it |
(b) Parallel with it |
|
(c) Series or parallel with it |
(d) Brightness of the bulb cannot be reduced |
A copper wire of length 1 m and radius 1 mm is joined in series with an iron wire of length 2 m and radius 3 mm and a current is passed through the wires. The ratio of the current density in the copper and iron wires is
|
(a) 18 : 1 |
(b) 9 : 1 |
(c) 6 : 1 |
(d) 2 : 3 |
In an elastic collision:
- The kinetic energy remains constant.
- The linear momentum remains constant.
- The final kinetic energy is equal to the initial kinetic energy.
- The final linear momentum is equal to the initial linear momentum.
Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is $0.5 \Omega$. The power loss in the wire is __________ .
→In Boolean algebra, A + B = Y implies that:
The rays of different colours fail to converge at a point after going through a converging lens. This defect is called: