A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of 45°. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value (s) of n from the following
|
(a) 1.5 |
(b) 1.6 |
(c) 1.3 |
(d) a, b |
(d) a, b
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The equivalent capacitance in the circuit between A and B will be
|
(a) 1 μF |
(b) 2 μF |
(c) 3 μF |
(d) |
The reading of the ammeter as per figure shown is
|
(a) |
(b) |
(c) |
(d) 2 A |
The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following condition is correct
|
(a) Lines of force minimum but induced e.m.f. is zero |
|
(b) Lines of force maximum but induced e.m.f. is zero |
|
(c) Lines of force maximum but induced e.m.f. is not zero |
|
(d) Lines of force maximum but induced e.m.f. is also maximum |
In the given circuit, it is observed that the current I is independent of the value of the resistance R6. Then the resistance values must satisfy
|
(a) |
(b) |
|
(c) |
(d) |
A solid that transmits light in visible region and has a very low melting point possesses
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(a) Metallic bonding |
(b) Ionic bonding |
|
(c) Covalent bonding |
(d) Vander Waal’s bonding |
A charged particle moving in a magnetic field experiences a resultant force
|
(a) In the direction of field |
|
(b) In the direction opposite to that field |
|
(c) In the direction perpendicular to both the field and its velocity |
|
(d) None of the above |
