Assertion : Charge is quantized
Reason : Charge, which is less than 1 C is not possible
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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. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
(c) If assertion is true but reason is false.
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The wavelengths involved in the spectrum of deuterium 
are slightly different from that of hydrogen spectrum, because
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(a) The attraction between the electr on and the nucleus is different in the two cases |
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(b) The size of the two nuclei are different |
|
(c) The nuclear forces are different in the two cases |
|
(d) The masses of the two nuclei are different |
A laser beam is used for carrying out surgery because it
|
(a) Is highly monochromatic |
(b) Is highly coherent |
|
(c) Is highly directional |
(d) Can be sharply focussed |
The electric potential V at any point O (x, y, z all in metres) in space is given by 
. The electric field at the point (1m,0, 2m) in volt/metre is
|
(a) 8 along negative X - axis |
(b) 8 along positive X - axis |
|
(c) 16 along negative X - axis |
(d) 16 along positive Z - axis |
An electron moving with the speed 5 
per sec is shooted parallel to the electric field of intensity 1 
. Field is responsible for the retardation of motion of electron. Now evaluate the distance travelled by the electron before coming to rest for an instant (mass of e = 9 
. charge = 1.6 
)
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(a) 7 m |
(b) 0.7 mm |
(c) 7 cm |
(d) 0.7 cm |
What is the ratio of heat generated in R and 2R
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
|
(a) 0 eV |
(b) 1 eV |
(c) 2 eV |
(d) 10 eV |