Two coherent sources of intensities, I1 and I2 produce an interference pattern. The maximum intensity in the interference pattern will be
|
(a) I1 + I2 |
(b) |
(c) (I1 + I2)2 |
(d) |
(d) 
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A current i ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is
|
(a) ∞ |
(b) Zero |
(c) |
(d) |
Lamps used for household lighting are connected in
|
(a) Series |
(b) Parallel |
(c) Mixed circuit |
(d) None of the above |
Which of the following particles are constituents of the nucleus
|
(a) Protons and electrons |
(b) Protons and neutrons |
|
(c) Neutrons and electrons |
(d) Neutrons and positrons |
A single slit of width a is illuminated by violet light of wavelength 400 nm and the width of the diffraction pattern is measured as y. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is
|
(a) The pattern vanishes and the width is zero |
(b) y / 3 |
|
(c) 3y |
(d) None of these |
In the case of bar magnet, lines of magnetic induction
|
(a) Start from the north pole and end at the south pole |
|
(b) Run continuously through the bar and outside |
|
(c) Emerge in circular paths from the middle of the bar |
|
(d) Are produced only at the north pole like rays of light from a bulb |
In terms of Rydberg's constant R, the wave number of the first Balmer line is
|
(a) R |
(b) 3R |
(c) |
(d) |
