Two waves have their amplitudes in the ratio 1 : 9. The maximum and minimum intensities when they interfere are in the ratio
|
(a) |
(b) |
(c) |
(d) |
(a) 
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A coin kept in a container and not visible can be viewed by pouring water into the container. It happens because of the:
Which of the following is vector quantity
|
(a) Current density |
(b) Current |
(c) Wattless current |
(d) Power |
Light appears to travel in straight lines since
|
(a) It is not absorbed by the atmosphere |
|
(b) It is reflected by the atmosphere |
|
(c) Its wavelength is very small |
|
(d) Its velocity is very large |
A normally incident ray reflected at an angle of 90°. The value of critical angle is
|
(a) 45° |
(b) 90° |
(c) 65° |
(d) 43.2° |
If an electron revolves in the path of a circle of radius of 0.5 
m at frequency of 5 × 1015 cycles/s the electric current in the circle is (Charge of an electron = 1.6 × 10–19 C )
|
(a) 0.4 mA |
(b) 0.8 mA |
(c) 1.2 mA |
(d) 1.6 mA |
The direction of induced e.m.f. during electromagnetic induction is given by
|
(a) Faraday's law |
(b) Lenz's law |
(c) Maxwell's law |
(d) Ampere's law |
Magnetic moments of two bar magnets may be compared with the help of
| (a) Deflection magnetometer | (b) Vibration magnetometer |
| (c) Both of the above | (d) None of the above |
At a place, the horizontal and vertical intensities of earth's magnetic field is 0.30 Gauss and 0.173 Gauss respectively. The angle of dip at this place is
| (a) 30° | (b) 90° | (c) 60° | (d) 45° |
