Particles having positive charges occasionally come with high velocity from the sky towards the earth. On account of the magnetic field of earth, they would be deflected towards the
|
(a) North |
(b) South |
(c) East |
(d) West |
(c) East
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Assertion : Cyclotron is a device which is used to accelerate the positive ion.
Reason : Cyclotron frequency depends upon the velocity.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A coil of self inductance 50 henry is joined to the terminals of a battery of e.m.f. 2 volts through a resistance of 10 ohm and a steady current is flowing through the circuit. If the battery is now disconnected, the time in which the current will decay to 1/e of its steady value is
|
(a) 500 seconds |
(b) 50 seconds |
(c) 5 seconds |
(d) 0.5 seconds |
If the ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be
|
(a) 24.6 eV |
(b) 24.6 V |
(c) 13.6 V |
(d) 13.6 eV |
$\text{Mr}^2$
$\frac{1}{2}\text{Mr}^2$
$\frac{1}4{}\text{Mr}^2$
$\frac{2}{5}\text{Mr}^2$
If the binding energy of the deutrium is 2.23 MeV. The mass defect given in a.m.u. is
|
(a) – 0.0024 |
(b) – 0.0012 |
(c) 0.0012 |
(d) 0.0024 |
The momentum of a photon is 3.3 
m/sec. Its frequency will be
|
(a) 3 |
(b) 6 |
(c) 7.5 |
(d) 1.5 |
A storage cell is charged by 5 amp D.C. for 18 hours. Its strength after charging will be
|
(a) 18 AH |
(b) 5 AH |
(c) 90 AH |
(d) 15 AH |
