A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away
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(a) Concave lens of 20 cm focal length |
(b) Convex lens of 20 cm focal length |
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(c) Concave lens of 12 cm focal length |
(d) Convex lens of 12 cm focal length |
(a) Concave lens of 20 cm focal length
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Kinetic energy of emitted cathode rays is dependent on
|
(a) Only voltage |
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(b) Only work function |
|
(c) Both (a) and (b) |
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(d) It does not depend upon any physical quantity |
In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled
|
(a) x |
(b) x/4 |
(c) 4x |
(d) 2x |
A coil has 1,000 turns and 500 cm2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2
. The coil is rotated through 180° in 0.2 seconds. The average e.m.f. induced in the coil, in milli-volts, is
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(a) 5 |
(b) 10 |
(c) 15 |
(d) 20 |
Three bulbs of 40W, 60W and 100W are arranged in series with 220V. Which bulb has minimum resistance
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(a) 40W |
(b) 60W |
(c) 100W |
(d) Equal in all bulbs |
What will be the colour of sky as seen from the earth, if there were no atmosphere
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(a) Black |
(b) Blue |
(c) Orange |
(d) Red |
Electron volt is a unit of
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(a) Potential |
(b) Charge |
(c) Power |
(d) Energy |