Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

To draw a maximum current from a combination of cells, how should the cells be grouped?

In the following star circuit diagram (figure), the equivalent resistance between the points A and H will be

(a) 1.944 r

(b) 0.973 r

(c) 0.486 r

(d) 0.243 r

The cathode of a photoelectric cell is changed such that the work function changes from W₁ to W₂ (W₂>W₁). If the current before and after change are I₁ and I₂, all other conditions remaining unchanged, then (assuming hn > W₂)

(a)

(b)

(c)

(d)

Light is:

In the process of fission, the binding energy per nucleon:

A source emits light of wavelength 4700Å, 5400 Å and 6500 Å. The light passes through red glass before being tested by a spectrometer. Which wavelength is seen in the spectrum

(a) 6500 Å

(b) 5400 Å

(c) 4700 Å

(d) All the above

Outside a nucleus           

(a) Neutron is stable

(b) Proton and neutron both are stable

(c) Neutron is unstable

(d) Neither neutron nor proton is stable

The momentum of a photon is 2  gm-cm/sec. Its energy is

(a) 0.61

(b) 2.0

(c) 6

(d) 6

When  ampere current is passed in a tangent galvanometer, there is a deflection of 30° in it. The deflection obtained when 3 amperes current is passed, is

(a) 30°

(b) 45°

(c) 60°

(d) 75°