Photo cells are used for the - Vidyadip

MCQ

Photo cells are used for the

A
Reproduction of pictures from the cinema film
✓
Reproduction of sound from the cinema film
C
Automatic switching of street light
D
$(b)$ and $(c)$ both

✓

Answer

Correct option: B.

Reproduction of sound from the cinema film

b
(d) Refer to the application of photo-cell.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 11. Dual nature of radiation and matter→11. Dual nature of radiation and matter — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The magnetic field in a plane electromagnetic wave is given by, $B=3.01 \times 10^{-7} \sin \left(6.28 \times 10^2 \times+2.2 \times 10^{10} t\right) \,T$. [where $x$ in $cm$ and $t$ in second]. The wavelength of the given wave is ....... $cm$

An astronaut is looking down on earth's surface from a space shuttle at an altitude of $400\,km.$ Assuming that the astronaut's pupil diameter is $5\,mm$ and the wavelength of visible light is $500\,nm.$ The astronaut will be able to resolve linear object of the size of about........$m$

The universal property of all substances is

The electric bulbs have tungsten filaments of same length. If one of them gives 60 watt and other 100 watt, then

In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistances are interchanged. The error so removed is

The increasing order of atomic radii of the following Group $13$ elements is

The impact of an image on the retina remains for......$sec$

Two coils have a mutual inductance 0.005 H. The current changes in the first coil according to equation $I = I _0 \sin$ $\Omega t$, where $I _0=10 A$ and $\omega=100 \pi rad s ^{-1}$. The maximum value of emf in the second coil is

The splitting of line into groups under the effect of electric or magnetic field is called

When an ac generator of $120\,V$ is connected in series with a capacitor and a resistor of $30\,\Omega $, the circuit carries a current $1·5\,A$. The potential difference across the capacitor will be.....$V$