Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of the lattice constant for this lattice is
|
(a) 1.27 Å |
(b) 5.08 Å |
(c) 2.54 Å |
(d) 3.59 Å |
(d) 3.59 Å
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An electron initially at rest, is accelerated through a potential difference of 200 volt, so that it acquires a velocity 8.4 
. The value of e/m of electron will be
|
(a) 2.76 |
(b) 1.76 |
(c) 0.76 |
(d) None of these |
Which of the following statement is wrong
|
(a) Infrared photon has more energy than the photon of visible light |
|
(b) Photographic plates are sensitive to ultraviolet rays |
|
(c) Photographic plates can be made sensitive to infrared rays |
|
(d) Infrared rays are invisible but can cast shadows like visible light rays |
For a material, the refractive indices for red, violet and yellow colour light are respectively 1.52, 1.64 and 1.60. The dispersive power of the material is
|
(a) 2 |
(b) 0.45 |
(c) 0.2 |
(d) 0.045 |
A 36 W galvanometer is shunted by resistance of 4W. The percentage of the total current, which passes through the galvanometer is
|
(a) 8 % |
(b) 9 % |
(c) 10 % |
(d) 91 % |
A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in figure, the loop will
| (a) Rotate about an axis parallel to the wire |
| (b) Move away from the wire or towards right |
| (c) Move towards the wire |
| (d) Remain stationary |
An electron and a proton are at a distance of 1
. The moment of this dipole will be (C X m)
|
(a) 1.6 |
(b) 1.6 |
(c) 3.2 |
(d) 3.2 |
Which one of the relation is correct between time period and number of orbits while an electron is revolving in a orbit
(a) 
|
(b) 
|
(c) 
|
(d) 
|
An electric motor operating on a 60 V dc supply draws a current of 10 A. If the efficiency of the motor is 50%, the resistance of its winding is
|
(a) 3Ω |
(b) 6 Ω |
(c) 15 Ω |
(d) 30 Ω |
Magnification of an optical instrument is expressed in:
