Two infinite plane parallel sheets separated by a distance d have equal and opposite uniform charge densities σ. Electric field at a point between the sheets is
|
(a) Zero |
(b) |
|
(c) |
(d) Depends upon the location of the point |
(b) 
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If a rod has resistance 4 W and if rod is turned as half cycle then the resistance along diameter
|
(a) 1.56 W |
(b) 2.44 W |
(c) 4 W |
(d) 2 W |
The mass number of a nucleus is
|
(a) Always less than its atomic number |
|
(b) Always more than its atomic number |
|
(c) Always equal to its atomic number |
|
(d) Sometimes more than and sometimes equal to its atomic number |
In a PN junction photo cell, the value of photo-electromotive force produced by monochromatic light is proportional to
|
(a) The voltage applied at the PN junction |
|
(b) The barrier voltage at the PN junction |
|
(c) The intensity of the light falling on the cell |
|
(d) The frequency of the light falling on the cell |
In a coil of area 
and 10 turns with a magnetic field directed perpendicular to the plane and is changing at the rate of 
gauss/second. The resistance of the coil is 20 ohm. The current in the coil will be
|
(a) 5 amp |
(b) 0.5 amp |
(c) 0.05 amp |
(d) 5 |
In a negative logic the following wave form corresponds to the
|
(a) 0000000000 |
(b) 0101101000 |
(c) 1111111111 |
(d) 1010010111 |
In Young's double slit experiment, the intensity on the screen at a point where path difference is l is K. What will be the intensity at the point where path difference is λ/4
|
(a) |
(b) |
(c) K |
(d) Zero |
Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio 1 : 2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is
|
(a) 1.1 |
(b) 1.2 |
(c) 1.3 |
(d) 1.4 |
