The working of optical instruments like camera, microscope, telescope, etc. having glass lenses is based on a phenomenon of light. Identify the phenomenon.
- AReflection
- BRefraction
- CDispersion
- DScattering
The working of optical instruments like camera, microscope, telescope, etc. having glass lenses is based on a phenomenon of light. Identify the phenomenon.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Bonding in a germanium crystal (semi- conductor) is
| (a) Metallic | (b) Ionic |
(c) Vander Waal's type |
(d) Covalent |
The potential gradient at which the dielectric of a condenser just gets punctured is called
|
(a) Dielectric constant |
(b) Dielectric strength |
(c) Dielectric resistance |
(d) Dielectric number |
An e.m.f. of 100 millivolts is induced in a coil when the current in another nearby coil becomes 10 ampere from zero in 0.1 second. The coefficient of mutual induction between the two coils will be
|
(a) 1 millihenry |
(b) 10 millihenry |
(c) 100 millihenry |
(d) 1000 millihenry |
Two ends of a conductor are at different temperatures the electromotive force generated between two ends is
|
(a) Seebeck electro motive force (e.m.f.) |
(b) Peltier electro motive force (e.m.f.) |
|
(c) Thomson electro motive force (e.m.f.) |
(d) None of these |
A potentiometer consists of a wire of length 4 m and resistance 10Ω. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be
|
(a) 0.5 V/m |
(b) 2 V/m |
(c) 5 V/m |
(d) 10 V/m |
In an interference experiment, third bright fringe is obtained at a point on the screen with a light of 700 nm. What should be the wavelength of the light source in order to obtain 5th bright fringe at the same point
|
(a) 500 nm |
(b) 630 nm |
(c) 750 nm |
(d) 420 nm |
The correct curve between voltage gain (
and load resistance (
is
(a)
|
(b)
|
(c)
|
(d)
|