An interference pattern was made by using red light. If the red light changes with blue light, the fringes will become
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(a) Wider |
(b) Narrower |
(c) Fainter |
(d) Brighter |
(b) Narrower
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Assertion : Electron capture occurs more often than positron emission in heavy elements.
Reason : Heavy elements exhibit radioactivity.
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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. |
$\text{v}=\frac{\text{v}_1+\text{v}_2}{2}$
$\text{v}=\sqrt{\text{v}_1\text{v}_2}$
$\frac{2}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
$\frac{1}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
For a normal eye, the least distance of distinct vision is
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(a) 0.25 m |
(b) 0.50 m |
(c) 25 m |
(d) Infinite |
An electron of mass 
initially at rest moves through a certain distance in a uniform electric field in time 
. A proton of mass 
also initially at rest takes time 
to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio of 
is nearly equal to
|
(a) 1 |
(b) |
(c) |
(d) 1836 |
What physical quantities may X and Y represent ? (Y represents the first mentioned quantity)
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(a) Pressure v/s temperature of a given gas (constant volume) |
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(b) Kinetic energy v/s velocity of a particle |
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(c) Capacitance v/s charge to give a constant potential |
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(d) Potential v/s capacitance to give a constant charge |
Electric room radiator which operates at 225 volts has resistance of 50 ohms. Power of the radiator is approximately
|
(a) 100 W |
(b) 450 W |
(c) 750 W |
(d) 1000 W |
Current in the circuit will be
|
(a) |
(b) |
(c) |
(d) |
