MCQ
Cathode ray consists of:
- APhotons.
- BElectrons.
- CProtons.
- DA-particles.
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Lens used to remove long sightedness (hypermetropia) is
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(a) Concave lens |
(b) Plano-concave lens |
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(c) Convexo-concave lens |
(d) Convex lens |
A convex mirror has a focal length f. A real object is placed at a distance f in front of it from the pole produces an image at
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(a) Infinity |
(b) f |
(c) f/2 |
(d) 2f |
If there had been one eye of the man, then
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(a) Image of the object would have been inverted |
(b) Visible region would have decreased |
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(c) Image would have not been seen three dimensional |
(d) (b) and (c) both |
Hubble's law is related with
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(a) Comet |
(b) Speed of galaxy |
(c) Black hole |
(d) Planetary motion |
A diffraction is obtained by using a beam of red light. What will happen if the red light is replaced by the blue light
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(a) Bands will narrower and crowd full together |
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(b) Bands become broader and further apart |
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(c) No change will take place |
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(d) Bands disappear |
Assertion : 29 is the equivalent decimal number of binary number 11101.
Reason : (11101)2 = (1 × 24 + 1 × 23 + 1 × 22 + 0 × 21 + 1 × 20 )10 = (16 + 8 + 4 + 0 + 1)10 = (29)10
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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. |
Spherical aberration in a lens
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(a) Is minimum when most of the deviation is at the first surface |
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(b) Is minimum when most of the deviation is at the second surface |
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(c) Is minimum when the total deviation is equally distributed over the two surface |
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(d) Does not depend on the above consideration |
In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
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(a) 3 : 4 |
(b) 1 : 3 |
(c) 9 : 4 |
(d) None of these |