- AElectrostatic energy.
- BMagnetic energy.
- CLight energy.
- DHeat energy.
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A nucleus of
originally at rest emits a particle with speed v. What will be the recoil speed of the daughter nucleus
| (a) 4v/206 | (b) 4v/214 | (c) v/206 | (d) v/214 |
Fast neutrons can easily be slowed down by
|
(a) The use of lead shielding |
(b) Passing them through water |
|
(c) Elastic collisions with heavy nuclei |
(d) Applying a strong electric field |
The length of the compound microscope is 14 cm. The magnifying power for relaxed eye is 25. If the focal length of eye lens is 5 cm, then the object distance for objective lens will be
|
(a) 1.8 cm |
(b) 1.5 cm |
(c) 2.1 cm |
(d) 2.4 cm |
A rod of length 20 cm is rotating with angular speed of 100 rps in a magnetic field of strength 0.5 T about it’s one end. What is the potential difference between two ends of the rod
|
(a) 2.28 V |
(b) 4.28 V |
(c) 6.28 V |
(d) 2.5 V |

The line joining the pole and the centre of curvature of a mirror is called the:
An X-ray machine has an accelerating potential difference of 25,000 volts. By calculation the shortest wavelength will be obtained as (h = 6.63
; e =
coulomb)
|
(a) 0.25 Å |
(b) 0.50 Å |
(c) 1.00 Å |
(d) 2.50 Å |
Electroplating does not help in
|
(a) Fine finish to the surface |
(b) Shining appearance |
|
(c) Metals to become hard |
(d) Protect metal against corrosion |
Which of the following planets have rings around it
|
(a) Uranus |
(b) Mars |
(c) Jupiter |
(d) Saturn |