When a plane mirror is rotated through an angle θ then the reflected ray turns through the angle 2θ then the size of the image
| (a) Is doubled | (b) Is halved | (c) Remains the same | (d) Becomes infinite |
When a plane mirror is rotated through an angle θ then the reflected ray turns through the angle 2θ then the size of the image
| (a) Is doubled | (b) Is halved | (c) Remains the same | (d) Becomes infinite |
(c) Remains the same
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The maximum intensity of fringes in Young's experiment is I. If one of the slit is closed, then the intensity at that place becomes Io. Which of the following relation is true ?
|
(a) I = Io |
(b) I = 2Io |
|
(c) I = 4Io |
(d) There is no relation between I and Io |
A one metre long wire is lying at right angles to the magnetic field. A force of 1 kg wt. is acting on it in a magnetic field of 0.98 Tesla. The current flowing in it will be
|
(a) 100 A |
(b) 10 A |
(c) 1 A |
(d) Zero |
In the following circuit find I1 and I2
|
(a) 0, 0 |
(b) 5 mA, 5 mA |
(c) 5 mA, 0 |
(d) 0, 5 mA |
When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of
|
(a) X-rays |
(b) Radio wave |
(c) Infrared rays |
(d) Green house effect |