For the sustained interference of light, the necessary condition is that the two sources should
|
(a) Have constant phase difference |
(b) Be narrow |
|
(c) Be close to each other |
(d) Of same amplitude |
(a) Have constant phase difference
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In the following circuit find I1 and I2
|
(a) 0, 0 |
(b) 5 mA, 5 mA |
(c) 5 mA, 0 |
(d) 0, 5 mA |
The image formed by a convex mirror of focal length 30 cm is a quarter of the size of the object. The distance of the object from the mirror is
|
(a) 30 cm |
(b) 90 cm |
(c) 120 cm |
(d) 60 cm |
The horizontal component of the earth's magnetic field is 0.22 Gauss and total magnetic field is 0.4 Gauss. The angle of dip. is
|
(a) |
(b) |
(c) |
(d) |
The curve between the activity A of a radioactive sample and the number of active atoms N is
|
(a)
|
(b)
|
(c)
|
(d)
|
$\frac{\text{k}_1}{\text{k}_2}$
$\sqrt{\frac{\text{k}_1}{\text{k}_2}}$
$\frac{\text{k}_2}{\text{k}_1}$
$\sqrt{\frac{\text{k}_2}{\text{k}^1}}$
Electromagnetic radiation of highest frequency is
|
(a) Infrared radiations |
(b) Visible radiation |
(c) Radio waves |
(d) g-rays |
Four capacitors are connected in a circuit as shown in the figure. The effective capacitance in μF between points A and B will be
|
(a) |
(b) 4 |
(c) 5 |
(d) 18 |
