- AAbsorb excess neutrons.
- BAbsorb alpha particle.
- CSlow down the reaction.
- DSpeed up the reaction.
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The slopes of anode and mutual characteristics of a triode are 0.02 mA V–1 and 1 mA V–1 respectively. What is the amplification factor of the valve
|
(a) 5 |
(b) 50 |
(c) 500 |
(d) 0.5 |
The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength 4
, if rotated through 90o in 0.1 s, the average emf induced in the coil is
|
(a) 0.012 V |
(b) 0.05 V |
(c) 0.1 V |
(d) 0.2 V |
In a potentiometer experiment two cells of e.m.f. E1 and E2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E2 is reversed, then the balancing length becomes 29 cm. The ratio of the e.m.f. of the two cells is
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 3 : 1 |
(d) 4 : 1 |
A biconvex lens with equal radii curvature has refractive index 1.6 and focal length 10 cm. Its radius of curvature will be
|
(a) 20 cm |
(b) 16 cm |
(c) 10 cm |
(d) 12 cm |