Electric Charges and Fields — Physics STD 12 Science — Question

Let V and E be the gravitational potential and gravitational field at a distance r from the centre of a uniform spherical shell. Consider the following two statements:

1. The plot of V against r is discontinuous.
2. The plot of E against r is discontinuous.

1. Both A and B are correct.
2. A is correct but B is wrong.
3. B is correct but A is wrong.
4. Both A and B are wrong.

The resultant capacitance  between A  and B  in the following figure is equal to

(a) 1 μF

(b) 3 μF

(c) 2 μF

(d) 1.5 μF

Gauss’s law is true for.

Photoelectric effect was successfully explained first by

(a) Planck

(b) Hallwash

(c) Hertz

(d) Einstein

When air in a capacitor is replaced by a medium of dielectric constant K, the capacity

In the Wheatstone's bridge shown, P = 2 Ω, Q = 3Ω, R = 6Ω and S = 8Ω. In order to obtain balance, shunt resistance across 'S' must be

(a) 2 Ω

(b) 3 Ω

(c) 6 Ω

(d) 8 Ω

A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 mm and refractive index 1.5 is introduced in the path of the upper beam. The location of the central maximum will

(a) Remain unshifted

(b) Shift downward by nearly two fringes

(c) Shift upward by nearly two fringes

(d) Shift downward by 10 fringes

A ray of light is incident on a transparent glass slab of refractive index 1.62.  The reflected and the refracted rays are mutually perpendicular. The angle of incidence is

(a) 58.3o

(b) 50o

(c) 35o

(d) 30o

The binding energy per nucleon of helium is :

If Young's double slit experiment is performed in water:

1. The fringe width will decrease.
2. The fringe width will increase.
3. The fringe width will remain unchanged.
4. There will be no fringe.