- A34
- B35.5
- C35
- DFind the accurate expressions.
Explanation:
Chlorine is a chemical element with the symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them.
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and
represents gravitational and electrostatic force respectively between electrons situated at a distance 10 cm. The ratio of
is of the order of
|
(a) |
(b) 10 |
(c) 1 |
(d) |
When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O-ray) and extra ordinary ray (E-ray) are produced. Then
|
(a) Both O-ray and E-ray are polarised perpendicular to the plane of incidence |
|
(b) Both O-ray and E-ray are polarised in the plane of incidence |
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(c) E-ray is polarised perpendicular to the plane of incidence and O-ray in the plane of incidence |
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(d) E-ray is polarised in the plane of incidence and O-ray perpendicular to the plane of incidence |
A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle
|
(a) 2θ |
(b) 0° |
(c) θ |
(d) 4θ |
A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell
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(a) Are one quarter as numerous |
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(b) Are half as numerous |
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(c) Each carry one quarter of their previous momentum |
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(d) Each carry one quarter of their previous energy |
When current flows through a conductor, then the order of drift velocity of electrons will be
|
(a) |
(b) |
(c) |
(d) |
Assertion : Gauss theorem is not applicable in magnetism.
Reason : Mono magnetic pole does not exist.
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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. |