The phase difference between incident wave and reflected wave is 180° when light ray
|
(a) Enters into glass from air |
(b) Enters into air from glass |
|
(c) Enters into glass from diamond |
(d) Enters into water from glass |
(a) Enters into glass from air
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The dielectric constant k of an insulator cannot be
|
(a) 3 |
(b) 6 |
(c) 8 |
(d) ∞ |
In a hydrogen atom, an electron moves in a circular orbit of radius 5.2 
and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be (Given 
|
(a) 6.53 |
(b) 13.25 |
|
(c) 9.6 |
(d) 1.04 |
The relation between n1 and n2, if behaviour of light rays is as shown in figure is
|
(a) |
(b) |
(c) |
(d) |
A plano-convex lens is made of refractive index of 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
|
(a) 400 cm |
(b) 200 cm |
(c) 100 cm |
(d) 50 cm |
Assertion : Charge is quantized
Reason : Charge, which is less than 1 C is not possible
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Two charges + 5μC and +10 μC are placed 20 cm apart. The net electric field at the mid-Point between the two charges is
|
(a) 4.5 |
|
(b) 4.5 |
|
(c) 13.5 |
|
(d) 13.5 |
