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Questions Related to physics

Multiple choice physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

According to the laws of reflection, angle of incidence is equal to angle of reflection.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the laws of reflection, the angle of incidence made by the incident ray with the normal must be equal to the angle of reflection made by the reflected ray with the normal i.e.  $i=r$. So, the given statement is true.

Multiple choice physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

A light ray makes an angle of incidence $60^o$, when it falls on a plane reflecting sheet.
The angle of reflection will be.

  1. $60^o$
  2. $30^o$
  3. $45^o$
  4. $90^o$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to laws of reflection angle of incidence is equal to angle of reflection, hence of $60^{0}$ angle of incidence, angle of reflection is also $60^{0}$.

Multiple choice physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

Read the given statements and select the correct option.
Statement 1: When a ray of light passes from air into water, it will bent towards the normal.
Statement 2: When light travels from air into water, its speed increases.

  1. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

  2. Both statements 1 and 2 are true and statement 2 is not the correct explanation of statement 1.

  3. Statement 1 is true but statement 2 is false.

  4. Statement 1 is false but statement 2 is true.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When light travels from air Into water, Its speed decreases.

Multiple choice physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

Riya and Priya were sitting around a round table. They noticed that they could see their own and each other's image onto the table top. Then table top is made of

  1. Unpolished wood, covered with white cloth

  2. Polished glass of red colour

  3. Glass covered with cellophane paper

  4. Smoked glass covered with green colour cloth.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Polished glass of red colour reflects some of the light incident on it so images of the both persons are formed on it.

Multiple choice physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

A ball of $1\ g$ released down an inclined plane describes a circle of radius $10\ cm$ in the vertical plane on reaching the bottom. The minimum height of the inclined plane is 

  1. $10\ cm$
  2. $15\ cm$
  3. $20\ cm$
  4. $25\ cm$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To complete a vertical circle of radius r at the bottom of an inclined plane, the minimum velocity needed at the bottom is v = sqrt(5gr). Using conservation of mechanical energy, potential energy mgh at the top of the incline converts entirely to kinetic energy at the bottom, so mgh = (1/2)mv^2 = (5/2)mgr, giving h = 2.5r = 25 cm.

Multiple choice physics light, shadows and images introduction to reflection of light light and sight images in plane mirror

If a ray of light passes from a denser medium to a rarer medium in a straight line, the angle of incident must be _____

  1. $0^o$
  2. $30^o$
  3. $60^o$
  4. $90^o$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When light passes from one medium to another, it only continues in a straight line without refraction if the angle of incidence is 0 degrees (normal incidence).