Nuclear fusion is common to the pair
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(a) Thermonuclear reactor, uranium based nuclear reactor |
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(b) Energy production in sun, uranium based nuclear reactor |
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(c) Energy production in sun, hydrogen bomb |
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(d) Disintegration of heavy nuclei, hydrogen bomb |
(c) Energy production in sun, hydrogen bomb
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
n equal resistors are first connected in series and then connected in parallel. What is the ratio of the maximum to the minimum resistance
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(a) n |
(b) |
(c) |
(d) |
Assertion : A loosely round helix made of stiff wire is suspended vertically with the lower end just touching a dish of mercury. When a current is passed through the wire, the helical wire executes oscillatory motion with the lower end jumping out of and inside of mercury.
Reason : When electric current is passed through helix, a magnetic field is produced both inside and outside the helix.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A nucleus of mass 218 amu in free state decays to emit an a-particle. Kinetic energy of the a-particle emitted is 6.7 MeV. The recoil energy (in MeV) of the daughter nucleus is
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(a) 1.0 |
(b) 0.5 |
(c) 0.25 |
(d) 0.125 |
The electric field E, current density J and conductivity s of a conductor are related as
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(a) σ = E/j |
(b) σ = j/E |
(c) σ = jE |
(d) σ = 1/jE |
A free neutron decays into a proton, an electron and
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(a) A neutrino |
(b) An antineutrino |
(c) An alpha particle |
(d) A beta particle |
