Serious draw back of the semiconductor device is
|
(a) They cannot be used with high voltage |
|
(b) They pollute the environment |
|
(c) They are costly |
|
(d) They do not last for long time |
(a) They cannot be used with high voltage
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Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons
|
(a) Electrostatic and gravitational |
|
(b) Electrostatic and nuclear |
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(c) Gravitational and nuclear |
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(d) Some other forces like Vander Waals |
The figure shows a graph between ln
and ln|n|, where 
is the area enclosed by the nth orbit in a hydrogen like atom. The correct curve is
|
(a) 4 |
(b) 3 |
(c) 2 |
(d) 1 |
Assertion : The energy of charged particle moving in a uniform magnetic field does not change.
Reason : Work done by magnetic field on the charge is zero.
|
(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. |
|
(d) If the assertion and reason both are false. |
The radioactive decay of uranium into thorium is expressed by the equation 
where ‘X’ is
|
(a) An electron |
(b) A proton |
(c) A deuteron |
(d) An alpha particle |
A point source of light is placed in front of a plane mirror:
Albedo is maximum for
|
(a) Pluto |
(b) Venus |
(c) Earth |
(d) Mercury |