In a transistor configuration b-parameter is
|
(a) |
(b) |
(c) |
(d) |
In a transistor configuration b-parameter is
|
(a) |
(b) |
(c) |
(d) |
(b)
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A person wears glasses of power – 2.5 D. The defect of the eye and the far point of the person without the glasses are respectively
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(a) Farsightedness, 40 cm |
(b) Nearsightedness, 40 cm |
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(c) Astigmatism, 40 cm |
(d) Nearsightedness, 250 cm |
In the adjoining circuit, the e.m.f. of the cell is 2 volt and the internal resistance is negligible. The resistance of the voltmeter is 80 ohm. The reading of the voltmeter will be
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(a) 0.80 volt |
(b) 1.60 volt |
(c) 1.33 volt |
(d) 2.00 volt |
The continuous x-ray spectrum obtained from a Coolidge tube is of the form
|
(a)
|
(b)
|
(b)
|
(d)
|
A point charge is kept at the centre of a metallic insulated spherical shell. Then
|
(a) Electric field out side the sphere is zero |
(b) Electric field inside the sphere is zero |
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(c) Net induced charge on the sphere is zero |
(d) Electric potential inside the sphere is zero |
The sensation of vision in the retina is carried to the brain by
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(a) Ciliary muscles |
(b) Blind spot |
(c) Cylindrical lens |
(d) Optic nerve |
The focal length of the objective of a compound microscope if fo and its distance from the eyepiece is L. The object is placed at a distance u from the objective. For proper working of the instrument:
Which is the wrong statement in following sentences? A device in which P and N-type semiconductors are used is more useful then a vacuum type because
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(a) Power is not necessary to heat the filament |
|
(b) It is more stable |
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(c) Very less heat is produced in it |
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(d) Its efficiency is high due to a high voltage across the junction |