- APlane
- BSpherical
- CCylindrical
- DParaboloidal
Explanation:
Wave front formed by the collimator of a spectrometer is a plane wave front, when r lit is in the focus.
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Assertion : When a magnet is brought near iron nails, only translatory force act on it.
Reason : The field due to a magnet is generally uniform.
|
(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. |
In the context of Doppler effect in light, the term ‘red shift’ signifies
|
(a) Decrease in frequency |
(b) Increase in frequency |
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(c) Decrease in intensity |
(d) Increase in intensity |
Assertion : Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.
Reason : A charged particle produces a magnetic field.
|
(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. |
If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will
| (a) Become half |
(b) Become one-fourth |
(c) Remain unchanged | (d) Become double |
The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an ac supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are
|
(a) 240 V, 5 A |
(b) 240 V, 10 A |
(c) 60 V, 20 A |
(d) 120 V, 20 A |
Magnifying glass forms: