- Asound waves only
- Blight waves only
- Cultrasonic waves only
- Dsound waves as well as light waves
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Four identical capacitors are connected as shown in diagram. When a battery of 6 V is connected between A and B, the charge stored is found to be 1.5. The value of
is
|
(a) 2.5 |
(b) 15 |
(c) 1.5 |
(d) 0.1 |

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is
|
(a) 0 V |
(b) 10 V |
|
(c) Same as at point 5 cm away from the surface |
(d) Same as at point 25 cm away from the surface |

“On flowing current in a conducting wire the magnetic field produces around it.” It is a law of
|
(a) Lenz |
(b) Ampere |
(c) Ohm |
(d) Maxwell |
If the decay or disintegration constant of a radioactive substance is λ, then its half life and mean life are respectively
|
(a) |
(b) |
(c) |
(d) |
The variation of magnetic susceptibility (x) with temperature for a diamagnetic substance is best represented by
|
(a)
|
(b)
|
(c)
|
(d)
|
If a number of sine waves with modulation indices n1, n2, n3 ........ modulate a carrier wave, then total modulation index (n) of the wave is
|
(a) n1 + n2 .... + 2(n1 + n2.....) |
(b) |
|
(c) |
(d) None of these |
The rays of different colors fail to converge at a point after going through a converging lens. This defect is called _________.
Which of the following radiations has the least wavelength
|
(a) g -rays |
(b) b-rays |
(c) a-rays |
(d) X-rays |