Tag: physics

Questions Related to physics

If any two media are optically exactly the same then; when light passes from one medium to another then:

conditions for a light ray to pass undeviated refraction of light at plane surfaces physics

  1. No bending occurs

  2. Sometimes it can bend

  3. Compete bending occurs

  4. None

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Correct Option: A
Explanation:

Since, both media are optically same, there is no difference in the absolute refractive indices of the two media.

        Hence, light passes through them undeviated that is no bending occurs.

Answer-(A)

Light, which is travelling along a normal, is ............ refracted

conditions for a light ray to pass undeviated refraction of light at plane surfaces physics

  1. Partially

  2. Completely

  3. Not

  4. All

Show answer
Correct Option: C
Explanation:

The light travelling along normal don't get refracted and passes undeviated.


Answer-(C).

A vertical ray of light strikes the horizontal surface of water. What will be the angle of incidence?

conditions for a light ray to pass undeviated refraction of light at plane surfaces physics

  1. $90^{\circ}$

  2. $100^{\circ}$

  3. $180^{\circ}$

  4. $0^{\circ}$

Show answer
Correct Option: D
Explanation:

Angle of incidence$(i)$ is the angle between incident ray and normal.

Here, ray strikes the surface normally, hence $i=0^{o}$

Answer-(D).

Which of the instruments used in chandrayaan were not indegenously built?

physics universe and space science human beings in space our pride - iii our scientist

  1. HEX

  2. LLRI

  3. SIR-2

  4. MIP

Show answer
Correct Option: C
Explanation:

Spectrometer Infrared -2 (SIR-2) is an infrared spectrometer build for remote sensing of the lunar surface. SIR-2 represents german scientific contribution to the Indian chandrayaan lunar mission. The project is funded by the Max Planck society and partly by European space agency.

Among the following which is not the achievements of Chandrayaan-1.

physics universe and space science human beings in space our pride - iii our scientist

  1. The discovery of the wide-spread presence of water molecules in lunar soil.

  2. Chandrayaans Moon Mineralogy Mapper has confirmed that moon was once completely molten.

  3. It has provided high-resolution spectral data on the mineralogy of the moon.

  4. Chandrayaan-1 has discovered large caves on the Mars surface that can act as a human shelter on the Mars.

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Correct Option: D
Explanation:

Chandrayaan- 1 was first Indian Planetary mission to moon. So option D is incorrect as it says information about Mars Surface. Hence it is incorrect.

All the statements given in option A, B and C are correct.

You are given four sources of light each one providing a light of a single colour red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90. Which of the following statements is correct, if the source of yellow light is replaced with that of other lights without changing the angle of incidence?

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. The beam of red light would undergo total internal reflection.

  2. The beam of red light would bend towards normal while it gets refracted through the second medium.

  3. The beam of blue light would undergo total internal reflection.

  4. The beam of green light would bend away from the normal as it gets refracted through the second medium.

Show answer
Correct Option: C
Explanation:

For yellow light, r=90$^{\circ}$, when $i=c$ since $i$ is kept $c$ should be smaller for total reflection

$\mu = \cfrac{1}{\sin{c}}$ 
If $c$ is small, $\mu$ will be large.
$\therefore c $ will be smallest for this colour.
Hence, blue colour will undergo total internal reflection.

A real image is formed when two or more

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. reflected rays meet

  2. refracted rays meet

  3. reflected rays appear to meet

  4. rays actually meet

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Correct Option: A,B,D
Explanation:

the real image is formed when two or more reflected or refracted rays actually meet at a point.

Select the odd one out w.r.t. the type of reflection of incident light

(wood, steel, silver, mirror, graphite)

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. mirror

  2. wood

  3. silver

  4. steel

Show answer
Correct Option: A
Explanation:

Except mirror all other causes irregular reflection

State whether true or false.
Regular reflection takes place when the light beam falls on a highly polished surface.

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

A highly polished surface acts like a reflecting surface which allows regular reflection to take place.

State whether true or false.
Regular reflection is produced when light falls on the rough walls.

physics reflection of light and shadow regular and irregular reflection regular and diffused reflection laws of reflection

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Regular reflection is produced when light falls on highly polished surface.