MCQ

The working of optical instruments like camera, microscope, telescope, etc. having glass lenses is based on a phenomenon of light. Identify the phenomenon.

  • A
    Reflection
  • B
    Refraction
  • C
    Dispersion
  • D
    Scattering

Answer

  1. Reflection

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

Similar questions

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

Consider the following two statements regarding a linearly polarised, plane electromagnetic wave:
  1. The electric field and the magnetic field have equal average values.
  2. The electric energy and the magnetic energy have equal average values.
  1. Both A and B are true.
  2. A is false but B is true.
  3. B is false but A is true
  4. Both A and B are false.
An ice cube is suspended in vacuum in a gravity free hall. As the ice melts it.
  1. Will retain its cubical shape.
  2. Will change its shape to spherical.
  3. Will fall down on the floor of the hall.
  4. Will fly up.

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

A horse-shoe magnet is an example of ________.

The correct curve between voltage gain (  and load resistance (  is

(a)

(b)

(c)

(d)