- APurification
- BAmplification
- CRectification
- DCurrent Amplification
Explanation:
The process by which ac is converted into dc is known as "Rectification".
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The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be
| (a) 4 sec | (b) 2 sec | (c) 0.5 sec | (d) 0.25 sec |
If a ray of light goes from a rarer medium to a denser medium, will it bend towards the normal or away from it?
A slit of width a is illuminated by white light. For red light (λ = 6500 Å), the first minima is obtained at θ = 30°. Then the value of a will be
|
(a) 3250 Å |
(b) 6.5 |
(c) 1.24 microns |
(d) 2.6 |
Activity of radioactive element decreased to one third of original activity
in 9 years. After further 9 years, its activity will be
|
(a) |
(b) |
(c) |
(d) |
Assertion : Separation of isotope is possible because of the difference in electron numbers of isotope.
Reason : Isotope of an element can be separated by using a mass spectrometer.
|
(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 assertion is false but reason is true. |
In a semiconductor, the concentration of electrons is 8
and that of the holes is 5
The semiconductor is
|
(a) P-type |
(b) N-type |
(c) Intrinsic |
(d) PNP-type |