Resistance of semiconductor at 0 K is
|
(a) Zero |
(b) Infinite |
(c) Large |
(d) Small |
Resistance of semiconductor at 0 K is
|
(a) Zero |
(b) Infinite |
(c) Large |
(d) Small |
(b) Infinite
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The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 mT. What will be its value at the centre of the loop
|
(a) 250 m T |
(b) 150 m T |
(c) 125 m T |
(d) 75 m T |
If each of the resistance of the network shown in the figure is R, the equivalent resistance between A and B is
|
(a) 5 R |
(b) 3 R |
(c) R |
(d) R/2 |
Consider an electron in the nth orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of the de Broglie wavelength λ of that electron as
|
(a) (0.259)n λ |
(b) |
(c) (13.6) λ |
(d) n λ |
Compton effect is associated with
| (a) α - rays | (b) β - rays | (c) X-rays | (d) Positive rays |
In a good conductor the energy gap between the conduction band and the valence band is
|
(a) Infinite |
(b) Wide |
(c) Narrow |
(d) Zero |
A slit of width a is illuminated by white light. For red light (λ = 6500 Å), the first minima is obtained at θ = 30°. Then the value of a will be
|
(a) 3250 Å |
(b) 6.5 |
(c) 1.24 microns |
(d) 2.6 |
Solar energy is mainly caused due to
|
(a) Fission of uranium present in the sun |
|
(b) Fusion of protons during synthesis of heavier elements |
|
(c) Gravitational contraction |
|
(d) Burning of hydrogen in the oxygen |
One cannot see through fog because .......... :