Question
Atomic radius of fcc is
|
(a) |
(b) |
(c) |
(d) |
✓
Answer
(b) 
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Similar questions
In Young's double slit experiment, the slits are 0.5 mm apart and interference pattern is observed on a screen placed at a distance of 1.0 m from the plane containing the slits. If wavelength of the incident light is 6000 Å, then the separation between the third bright fringe and the central maxima is
|
(a) 4.0 mm |
(b) 3.5 mm |
(c) 3.0 mm |
(d) 2.5 mm |
Select the right option in the following
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(a) Christian Huygens a contemporary of Newton established the wave theory of light by assuming that light waves were transverse |
|
(b) Maxwell provided the compelling theoretical evidence that light is transverse wave |
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(c) Thomas Young experimentally proved the wave behaviour of light and Huygens assumption |
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(d) All the statements give above, correctly answers the question “what is light” |
A heater coil connected to a supply of a 220 V is dissipating some power 
The coil is cut into half and the two halves are connected in parallel. The heater now dissipates a power 
The ratio of power 
is
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(a) 2 : 1 |
(b) 1 : 2 |
(c) 1 : 4 |
(d) 4 : 1
|
Which among the following is true?
Two photons having:
- Equal wavelengths have equal linear momenta.
- Equal energies have equal linear momenta.
- Equal frequencies have equal linear momenta.
- Equal linear momenta have equal wavelengths.
In a nuclear reactor, the fuel is consumed at the rate of 1 mg/s. The power generated in kilowatt is
(a) 9 
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(b) 9 
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(c) 9
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(d) 9 
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The incorrect statement regarding the lines of force of the magnetic field B is
|
(a) Magnetic intensity is a measure of lines of force passing through unit area held normal to it |
|
(b) Magnetic lines of force form a close curve |
|
(c) Inside a magnet, its magnetic lines of force move from north pole of a magnet towards its south pole |
|
(d) Due to a magnet magnetic lines of force never cut each other |
The distance between the plates of a parallel plate condenser is 8mm and P.D. 120 volts. If a 6mm thick slab of dielectric constant 6 is introduced between its plates, then
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(a) The charge on the condenser will be doubled |
|
(b) The charge on the condenser will be reduced to half |
|
(c) The P.D. across the condenser will be 320 volts |
|
(d) The P.D. across the condenser will be 45 volts |
Electromagnets are made of soft iron because soft iron has:
Line spectrum was first of all theoretically explained by
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(a) Swan |
(b) Fraunhofer |
(c) Kirchoff |
(d) Bohr |