- AAbsorb excess neutrons.
- BAbsorb alpha particle.
- CSlow down the reaction.
- DSpeed up the reaction.
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A achromatic combination is made with a lens of focal length f and dispersive power ω with a lens having dispersive power of 2ω. The focal length of second will be
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(a) 2f |
(b) f/2 |
(c) -f/2 |
(d) – 2 f |
As shown in the figure a metal rod makes contact and complete the circuit. The circuit is perpendicular to the magnetic field with B = 0.15 tesla. If the resistance is 3Ω, force needed to move the rod as indicated with a constant speed of 2m/sec is

|
(a) 3.75 |
(b) 3.75 |
(c) 3.75 |
(d) 3.75 |
The two bulbs as in the above question are connected in series to a 200 volt line. Then
|
(a) The potential drop across the two bulbs is the same |
|
(b) The potential drop across the 40 watt bulb is greater than the potential drop across the 100 watt bulb |
|
(c) The potential drop across the 100 W bulb is greater than the potential drop across the 40 W bulb |
|
(d) The potential drop across both the bulb is 200 volt |
