In Young’s double slit experiment, the distance between the two slits is made half, then the fringe width will become
|
(a) Half |
(b) Double |
(c) One fourth |
(d) Unchanged |
(b) Double
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There is an air filled 1 pF parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increases to 2pF. The dielectric constant of wax is
|
(a) 2 |
(b) 4 |
(c) 6 |
(d) 8 |
A parallel plate condenser has a capacitance 50μF in air and 110μF when immersed in an oil. The dielectric constant ‘k’ of the oil is
|
(a) 0.45 |
(b) 0.55 |
(c) 1.10 |
(d) 2.20 |
If a rod has resistance 4 W and if rod is turned as half cycle then the resistance along diameter
|
(a) 1.56 W |
(b) 2.44 W |
(c) 4 W |
(d) 2 W |
A current carrying coil is placed with its axis perpendicular to N-S direction. Let horizontal component of earth's magnetic field be Ho and magnetic field inside the loop is H. If a magnet is suspended inside the loop, it makes angle θ with H. Then θ =
|
(a) |
(b) |
(c) |
(d) |
An object has image thrice of its original size when kept at 8 cm and 16 cm from a convex lens. Focal length of the lens is
|
(a) 8 cm |
(b) 16 cm |
|
(c) Between 8 cm and 16 cm |
(d) Less than 8 cm |
The photoelectric threshold wavelength for potassium (work function being 2eV ) is
|
(a) 310 nm |
(b) 620 nm |
(c) 1200 nm |
(d) 2100 nm |
