The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere/second, then the induced e.m.f. in the secondary is
|
(a) 12.5 V |
(b) 64.0 V |
(c) 0.016 V |
(d) 100.0 V |
(d) 100.0 V
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The mechanism of the hydrogen bomb is based on
|
(a) Fission of isotopes of hydrogen |
(b) Fusion of protons |
|
(c) Fusion of deutrium and tritium |
(d) Fusion of neutrons |
Amplification factor of a triode is 10. When the plate potential is 200 volt and grid potential is – 4 volt, then the plate current of 4mA is observed. If plate potential is changed to 160 volt and grid potential is kept at – 7 volt, then the plate current will be
|
(a) 1.69 mA |
(b) 3.95 mA |
(c) 2.87 mA |
(d) 7.02 mA |
The main source of solar energy is
|
(a) Fission reactions |
(b) Fusion reactions |
|
(c) Chemical reactions |
(d) Combustion reactions |
A circular coil of radius 5 cm has 500 turns of a wire. The approximate value of the coefficient of self induction of the coil will be
|
(a) 25 millihenry |
(b) 25 |
|
(c) 50 |
(d) 50 |
A gamma ray photon creates an electron- positron pair. If the rest mass energy of an electron is 0.5 MeV and the total K.E. of the electron- positron pair is 0.78 MeV, then the energy of the gamma ray photon must be
|
(a) 0.78 MeV |
(b) 1.78 MeV |
(c) 1.28 MeV |
(d) 0.28 MeV |
