MCQ

A point source of light is placed in front of a plane mirror:

  • A
    All the reflected rays meet at a point when produced backward.
  • B
    Only the reflected rays close to the normal meet at a point when produced backward.
  • C
    Only the reflected rays making a small angle with the mirror, meet at a point when produced backward.
  • D
    Light of different colours make different images.

Answer

  1. All the reflected rays meet at a point when produced backward.

Explanation:

​​​​​​​

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

A double convex lens has two surfaces of equal radii R and refractive index $\mu=1.5$ We have,

  1. $\text{f}=\frac{\text{R}}{2}$

  2. $\text{f}=\text{R}$

  3. $\text{f}=-\text{R}$

  4. $\text{f}=2\text{R}$

A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4D, the power of a cutlens will be:
  1. 2D
  2. 3D
  3. 4D
  4. 5D.

The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation

(a) The intensity increases

(b) The minimum wavelength increases

(c) The intensity decreases

(d) The minimum wavelength decreases

For moving ball of cricket, the correct statement about de-Broglie wavelength is

(a) It is not applicable for such big particle

(b)  

(c)

(d)

Force of attraction between two point charges Q and -Q separated by d metre is . When these charges are placed on two identical spheres of radius R = 0.3d whose centres are d metre apart, the force of attraction between them is

(a) Greater than  

(b) Equal to  

(c) Less than  

(d) Less than  

Consider the following two statements A and B, and identify the correct choice out of given answers

A. Thermo e.m.f. is minimum at neutral temperature of a thermocouple

B. When two junctions made of two different metallic wires are maintained at different temperatures, an electric current is generated in the circuit.

(a) A is false and B is true

(b) A is true and B is false

(c) Both A and B are false

(d) Both A and B are true

If A and B are two inputs in AND gate, then AND gate has an output of 1 when the values of A and B are

(a) A = 0, B = 0

(b) A = 1, B = 1

(c) A = 1, B = 0

(d) A = 0, B = 1

Assertion  :  The earth’s magnetic field does not affect the working of a moving coil galvanometer.

Reason     : Earth’s magnetic field is very weak.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Electromagnetic waves are transverse in nature is evident by

(a) Polarization

(b) Interference

(c) Reflection

(d) Diffraction

A small bar magnet has a magnetic moment 1.2 A-m2. The magnetic field at a distance 0.1 m on its axis will be : (m0 = 4p  × 10–7 T-m/A)

(a) 1.2 × 10–4 T

(b) 2.4 × 10–4 T   

(c) 2.4 × 104 T

(d) 1.2 × 104 T