Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

A hemisphere is uniformely charged positively. The electric field at a point on a diameter away from the centre is directed.

Light is incident normally on a diffraction grating through which the first order diffraction is seen at 32^o. The second order diffraction will be seen at

(a) 48o

(b) 64o

(c) 80o

(d) There is no second order diffraction in this case

If one penetrates a uniformly charged spherical cloud, electric field strength:

Magnitude of current at half power point in a circuit is:

Principle of photoelectric effect was established by :

In an interference arrangement similar to Young's double slit experiment, the slits S₁ and S₂ are illuminated with coherent microwave sources each of frequency 10⁶ Hz. The sources are synchronized to have zero phase difference. The slits are separated by distance d = 150 m. The intensity I (𝜃) is measured as a function of q, where q is defined as shown. If I₀ is maximum intensity, then I(θ)  for 0 ≤ θ ≤ 90° is given by

(a) I(θ) =   for  θ = 0°	(b) I(θ) =   for θ = 30°
(c) I(θ) =    for θ =  90°	(d) a, b

Choose the correct option about light.

A capacitor of capacity  is charged to the potential of . On disconnecting with the battery, it is connected with a capacitor of capacity   as shown in the adjoining figure. The ratio of energies before and after the connection of switch  S will be

(a) (

(b)

(c)

(d)

Let I_A and I_B be moments of inertia of a body about two axes A and B respectively. The axis A passes through the centre of mass of the body but B does not:

1. I_A < I_B.
2. If I_A < I_B, the axes are parallel.
3. If the axes are parallel, I_A < I_B.
4. If the axes are not parallel I_A > I_B.