MARCH 2024 — Physics STD 12 Science — Question

A charge q  is placed at the centre of a cube. Then the flux passing through one face of cube will be

(a)

(b)

(c)

(d)

What is the valence electron in alkali metal?

The slope of frequency of incident light and stopping potential graph for  a given surface will be

(a) h

(b) h/e

(c) eh

(d) e

Three glass prisms A, B and C of same refractive index are placed in contact with each other as shown in figure, with no air gap between the prisms. Monochromatic ray of light OP passes through the prism assembly and emerges as QR. The conditions of minimum deviation is satisfied in the prisms

(a) A and C	(b) B and C
(c) A and B	(d) In all prisms A, B and C

Two circular loops of equal radii are placed coaxially at some separation. The first is cut and a battery is inserted in between to drive a current in it. The current c~anges slightly because of the variation in resistance with temperature. During this period, the two loops:

Energy of an electron in an excited hydrogen atom is – 3.4 eV. Its angular momentum will be: h = 6.626  

(a) 1.11

(b) 1.51

(c) 2.11

(d) 3.72

Assertion  :  Corpuscular theory fails in explaining the velocities of light in air and water.

Reason      : According to corpuscular theory, light should travel faster in denser medium than, in rarer medium.

(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.

Which of the following quantities related to a lens depend on the wavelength or wavelengths of the incident light?

1. Power.
2. Focal length.
3. Chromatic aberration.
4. Radii of curvature.