Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32o. The second order diffraction will be seen at
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(a) 48o |
|
(b) 64o |
|
(c) 80o
|
|
(d) There is no second order diffraction in this case |
(d) There is no second order diffraction in this case
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A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across a 220 volt lines. Which electric bulb will glow more brightly
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(a) 25 watt bulb |
(b) 100 watt bulb |
|
(c) First 25 watt and then 100 watt |
(d) Both with same brightness |
In the circuit shown below the resistance of the galvanometer is 20 W. In which case of the following alternatives are the currents arranged strictly in the decreasing order
|
(a) i, i1, i2, ig |
(b) i, i2, i1, ig |
(c) i, i2, ig, i1 |
(d) i, i1, ig, i2 |
In a compound microscope, if the objective produces an image Io and the eye piece produces an image Ie, then
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(a) Io is virtual but Ie is real |
(b) Io is real but Ie is virtual |
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(c) Io and Ie are both real |
(d) Io and Ie are both virtual |
When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms–1)
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(a) 3 |
(b) |
(c) |
(d) 0.5 |
n electron is moving on a circular path of radius r with speed v in a transverse magnetic field B. e/m for it will be
|
(a) |
(b) |
(c) Bvr |
(d) |
How should people wearing spectacles work with a microscope?
