MCQ
While using an electric bulb, the reflection for street lighting should be from
- AConcave mirror
- ✓Convex mirror
- CCylindrical mirror
- DParabolic mirror
✓
Answer
Correct option: B.
Convex mirror
b
( b)To make the light diverging as much as possible.
( b)To make the light diverging as much as possible.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Holes are charge carriers in
Assume that a neutron breaks into a proton and an electron. The energy released during this process is :............$MeV$ (mass of neutron $= 1.6725 \times 10^{-27}$ $kg$ mass of proton $= 1.6725 \times 10^{-27} $ $kg$ mass of electron = $9 \times 10^{-31} $ $kg$)
→A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called
A 36 W galvanometer is shunted by resistance of 4W. The percentage of the total current, which passes through the galvanometer is
The mass number of a nucleus is
The angular magnification of a simple microscope can be increased by increasing
In the circuit shown in the figure, the $ac$ source gives a voltage $V = 20\cos \,(2000\,t).$ Neglecting source resistance, the voltmeter and ammeter reading will be
→An electric field $\overrightarrow{\mathrm{E}}=(2 \mathrm{xi}) \mathrm{NC}^{-1}$ exists in space. $\mathrm{A}$ cube of side $2 \mathrm{~m}$ is placed in the space as per figure given below. The electric flux through the cube is .................. $\mathrm{Nm}^2 / \mathrm{C}$
→In photoelectric effect when photons of energy $h \nu$ fall on a photosensitive surface (work function $h v_0$ ) electrons are emitted from the metallic surface. It is possible to say that
→The number of turns in the coil of an ac generator is $5000$ and the area of the coil is $0.25\,{m^2}$. The coil is rotated at the rate of $100$ cycles/sec in a magnetic field of $0.2$ $W/{m^2}$. The peak value of the emf generated is nearly......$kV$
→