MCQ
One curie is equal to:
- A3.7 × 1010 Disintegration/ sec.
- B3.2 × 108 Disintegration/ sec.
- C2.8 × 1010 Disintegration/ sec.
- DNone of these.
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Potassium has a bcc structure with nearest neighbour distance 4.525 Å. Its molecular weight is 39. Its density in kg/m3 is
|
(a) 900 |
(b) 494 |
(c) 602 |
(d) 802 |
An electric bulb is rated 220 volt and 100 watt. Power consumed by it when operated on 110 volt is
|
(a) 50 watt |
(b) 75 watt |
(c) 90 watt |
(d) 25 watt |
The line joining the pole and the centre of curvature of a mirror is called the: