- AAmplitude is higher.
- BFrequency is higher.
- CWavelength is longer.
- DWavelength is shorter.
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If convex lens of focal length 80cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power
|
(a) + 6.5 D |
(b) – 6.5 D |
(c) + 7.5 D |
(d) – 0.75 D |

Watt-hour meter measures
|
(a) Electric energy |
(b) Current |
(c) Voltage |
(d) Power |
An electron passing through a potential difference of 4.9 V collides with a mercury atom and transfers it to the first excited state. What is the wavelength of a photon corresponding to the transition of the mercury atom to its normal state
|
(a) 2050 Å |
(b) 2240 Å |
(c) 2525 Å |
(d) 2935 Å |
A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is
|
(a) |
(b) |
(c) |
(d) |
AM is used for broadcasting because
|
(a) It is more noise immune than other modulation systems |
|
(b) It requires less transmitting power compared with other systems |
|
(c) Its use avoids receiver complexity |
|
(d) No other modulation system can provide the necessary bandwidth faithful transmission |
An atom of mass number 15 and atomic number 7 captures an α - particle and then emits a proton. The mass number and atomic number of the resulting product will respectively be
|
(a) 14 and 2 |
(b) 15 and 3 |
(c) 16 and 4 |
(d) 18 and 8 |