A light wave is incident normally over a slit of width 24 
. The angular position of second dark fringe from the central maxima is 30o. What is the wavelength of light
|
(a) 6000 Å |
(b) 5000 Å |
(c) 3000 Å |
(d) 1500 Å |
(a) 6000 Å
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The length of the compound microscope is 14 cm. The magnifying power for relaxed eye is 25. If the focal length of eye lens is 5 cm, then the object distance for objective lens will be
|
(a) 1.8 cm |
(b) 1.5 cm |
(c) 2.1 cm |
(d) 2.4 cm |
The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form helium atom, the energy released is
|
(a) 19.2 MeV |
(b) 23.6 MeV |
(c) 26.9 MeV |
(d) 13.9 MeV |
The time required to pass the light through a glass slab of 2 mm thick is (
)
|
(a) |
(b) |
(c) |
(d) |
In the circuit shown in figure, the heat produced in 5 ohm resistance is 10 calories per second. The heat produced in 4 resistance is
|
(a) 1 cal / sec |
(b) 2 cal/sec |
(c) 3 cal / sec |
(d) 4 cal/sec |
The resistance of a wire of iron is 10 ohms and temp. coefficient of resistivity is 5
. At 20
it carries 30 milliamperes of current. Keeping constant potential difference between its ends, the temperature of the wire is raised to 120. The current in milliamperes that flows in the wire is
|
(a) 20 |
(b) 15 |
(c) 10 |
(d) 40 |
By ammeter, which of the following can be measured
|
(a) Electric potential |
(b) Potential difference |
(c) Current |
(d) Resistance |
