ICS Part 1 Physics English Medium Chapter 9 Online Short Questions Test with Answers

Online Short Questions For Chapter 9 "ICS Part 1 Physics Chapter 9 Short Questions Test "

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Physics - ICS Part 1 Physics Chapter 9 Short Questions Test

Question # 1

Under what conditions two or more sources of light behave as coherent sources?

Ans 1: Toe or more sources of light behave as coherent sources if
1. They emit monochromatic wave.
2. They are phase coherent.

Question # 2

In Newton's rings, Why are the fringes circular?

Ans 1: The thickness of the air film between plano-convex lens and plane glass plate is almost zero at the point of contact "o" and gradually increases as we proceed towards the periphery of the lens. Thus, points where the thickness of air film is constant will lie on a circle with "o" as centre. That is why circular fringes are produced.

Question # 3

Why diffraction grating cannot be used for X-Rays diffraction?

Ans 1: In order to observe the effects of diffraction, the grating spacing must be of the order of wavelength of the incident light.
X-rays are of much shorter wavelength of the order of 10^-10 M
The regular array of atoms in a crystal forms a natural diffraction grating with spacing =10^-10 M.Which is not available in other diffraction grating.

Question # 4

Can you obtain plane polarized light from un-polarized light? If your answer is yes, write the name of two processes by which plane polarized light is obtained.

Ans 1: Yes , we can obtain plane polarized light from un-polarized light.
This can be achieved by processes such as
- Selective absorption
- Reflection from different surfaces

Question # 5

Why the polaroid sun glasses are better than ordinary sun glasses?

Ans 1: Polaroid sun glasses are better than ordinary sun glasses because they reduce the glare of light entering into the eye as a result of polarization.

Question # 6

In Newton's rings, Why are the fringes circular?

Ans 1: The thickness of the air film between plano-convex lens and plane glass plate is almost zero at the point of contact "o" and gradually increases as we proceed towards the periphery of the lens. Thus, points where the thickness of air film is constant will lie on a circle with "o" as centre. That is why circular fringes are produced.

Question # 7

Write two steps of Huygen's principle.

Ans 1:
1. Each point of a wave front may be considered as a source of secondary wavelets.
2. The new position of the wave front after a certain interval of time can be found by constructing a surface that touches all the secondary wavelets.

Question # 8

Define polarization of light.

Ans 1: The phenomenon in which the vibration of waves can be oriented to any one direction (plane), That may be vertical, horizontal or any other direction is called polarization of light.

Question # 9

Write down selective absorption method to obtain plane polarized light from ordinary light.

Ans 1: Selective Absorption: The selective absorption method is the most common method to obtain plane polarized light by using certain types of materials called dichroic substances. Theses materials transmit only those waves.Whose vibration are parallel to a particular direction and will absorb those waves vibrations are in other directions. One such commercial polarizing material is a polaroid.

Question # 10

If white light is incident on a film of irregular thickness at all possible angles,what will be the pattern of interference fringes? Explain your answer.

Ans 1: If white light is incident on a film of irregular thickness at all possible angles, we should consider the interference pattern due to each spectral colour separately. If at a certain place condition of destructive interference of one colour is satisfied then that portion of film will exhibit the remaining constituent colours of white light.

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Prepare Complete Set Wise Questions For Chapter 9 "ICS Part 1 Physics Chapter 9 Short Questions Test "

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ICS Part 1 Physics Chapter 9 Short Questions Test - Set 1

Question # 1

Under what conditions two or more sources of light behave as coherent sources?

Ans 1: Toe or more sources of light behave as coherent sources if
1. They emit monochromatic wave.
2. They are phase coherent.

Question # 2

In Newton's rings, Why are the fringes circular?

Ans 1: The thickness of the air film between plano-convex lens and plane glass plate is almost zero at the point of contact "o" and gradually increases as we proceed towards the periphery of the lens. Thus, points where the thickness of air film is constant will lie on a circle with "o" as centre. That is why circular fringes are produced.

Question # 3

Why diffraction grating cannot be used for X-Rays diffraction?

Ans 1: In order to observe the effects of diffraction, the grating spacing must be of the order of wavelength of the incident light.
X-rays are of much shorter wavelength of the order of 10^-10 M
The regular array of atoms in a crystal forms a natural diffraction grating with spacing =10^-10 M.Which is not available in other diffraction grating.

Question # 4

Can you obtain plane polarized light from un-polarized light? If your answer is yes, write the name of two processes by which plane polarized light is obtained.

Ans 1: Yes , we can obtain plane polarized light from un-polarized light.
This can be achieved by processes such as
- Selective absorption
- Reflection from different surfaces

Question # 5

Why the polaroid sun glasses are better than ordinary sun glasses?

Ans 1: Polaroid sun glasses are better than ordinary sun glasses because they reduce the glare of light entering into the eye as a result of polarization.

Question # 6

In Newton's rings, Why are the fringes circular?

Ans 1: The thickness of the air film between plano-convex lens and plane glass plate is almost zero at the point of contact "o" and gradually increases as we proceed towards the periphery of the lens. Thus, points where the thickness of air film is constant will lie on a circle with "o" as centre. That is why circular fringes are produced.

Question # 7

Write two steps of Huygen's principle.

Ans 1:
1. Each point of a wave front may be considered as a source of secondary wavelets.
2. The new position of the wave front after a certain interval of time can be found by constructing a surface that touches all the secondary wavelets.

Question # 8

Define polarization of light.

Ans 1: The phenomenon in which the vibration of waves can be oriented to any one direction (plane), That may be vertical, horizontal or any other direction is called polarization of light.

Question # 9

Write down selective absorption method to obtain plane polarized light from ordinary light.

Ans 1: Selective Absorption: The selective absorption method is the most common method to obtain plane polarized light by using certain types of materials called dichroic substances. Theses materials transmit only those waves.Whose vibration are parallel to a particular direction and will absorb those waves vibrations are in other directions. One such commercial polarizing material is a polaroid.

Question # 10

If white light is incident on a film of irregular thickness at all possible angles,what will be the pattern of interference fringes? Explain your answer.

Ans 1: If white light is incident on a film of irregular thickness at all possible angles, we should consider the interference pattern due to each spectral colour separately. If at a certain place condition of destructive interference of one colour is satisfied then that portion of film will exhibit the remaining constituent colours of white light.

Submit

ICS Part 1 Physics Chapter 9 Short Questions Test - Set 2

Question # 1

Give the list of two substance which shows optical rotation when they are in solution.

Ans 1: Sugar and tartaric acid show optical rotation when they are in solution.

Question # 2

What are Newton's rings?

Ans 1: When a plano-convex lens of long focal length is placed in contact with a plane glass plate, a thin air film is enclosed between them to form circular dark and bright fringes known as Newton's rings.

Question # 3

Write the names of any four processes to obtain plane polarized beam of light from un-polarized light.

Ans 1: This can be achieved by four processes such as
1. Selective absorption
2. Refraction throughout crystals
3. Reflection from different surfaces
4. Scattering by small particles.

Question # 4

What condition must be met by interfering beams to observe the phenomena of interference?

Ans 1: The following conditions must be met, in order to observe the phenomenon.
1. The interfering beams must be monochromatic, that is, of a single wavelength.
2. The interfering beams of light must be coherent.

Question # 5

If white light is incident on a film of irregular thickness at all possible angles,what will be the pattern of interference fringes? Explain your answer.

Ans 1: If white light is incident on a film of irregular thickness at all possible angles, we should consider the interference pattern due to each spectral colour separately. If at a certain place condition of destructive interference of one colour is satisfied then that portion of film will exhibit the remaining constituent colours of white light.

Question # 6

How would you manage to get more orders of spectra using a diffraction grating?

Ans 1:

Question # 7

Define optical rotation. Give its practical use.

Ans 1: When a plane polarized light is passed through certain crystals, they rotate the plane of polarization. It is called optical rotation.
Organic solutions such as sugar, tartaric acid etc., show optical rotation which is used to determine their concentration in the solutions.

Question # 8

What is difference between interference and diffraction fringes?

Ans 1: Interference Fringes: The superposition of two waves having same frequency and travelling in same direction results in bright and dark fringes is called interference fringes.

Diffraction Fringes: The fringes formed due to the bending of light around edges and corners are called diffraction fringes.

Question # 9

Can you obtain plane polarized light from un-polarized light? If your answer is yes, write the name of two processes by which plane polarized light is obtained.

Ans 1: Yes , we can obtain plane polarized light from un-polarized light.
This can be achieved by processes such as
- Selective absorption
- Reflection from different surfaces

Question # 10

What is Michelson's interferometer? Also write its working principle.

Ans 1: Michelson's interferometer is an instrument that is capable of measuring distance with extremely high precision.
Its working is based on interference. When light from a single source splits up into two parts and then interfere, it forms an interference pattern.

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ICS Part 1 Physics Chapter 9 Short Questions Test - Set 3

Question # 1

What is Michelson's interferometer? Also write its working principle.

Ans 1: Michelson's interferometer is an instrument that is capable of measuring distance with extremely high precision.
Its working is based on interference. When light from a single source splits up into two parts and then interfere, it forms an interference pattern.

Question # 2

In Newton's rings, Why are the fringes circular?

Ans 1: The thickness of the air film between plano-convex lens and plane glass plate is almost zero at the point of contact "o" and gradually increases as we proceed towards the periphery of the lens. Thus, points where the thickness of air film is constant will lie on a circle with "o" as centre. That is why circular fringes are produced.

Question # 3

What do you mean by coherent source ? Explain a common method for producing two coherent sources.

Ans 1: The monochromatic sources of light which emit waves, having a constant phase difference are called coherent sources.
A common method of producing two coherent light beams is to use a monochromatic source to illuminate a screen containing two small holes, usually in the shape of slits. The light emerging from the two slits is coherent because a single source produces the original beam and two slits serve only too split it into two parts.

Question # 4

Can you obtain plane polarized light from un-polarized light? If your answer is yes, write the name of two processes by which plane polarized light is obtained.

Ans 1: Yes , we can obtain plane polarized light from un-polarized light.
This can be achieved by processes such as
- Selective absorption
- Reflection from different surfaces

Question # 5

How will you increase the fringe width in young's double slit experiment?

Ans 1:

Question # 6

What is diffraction of light?

Ans 1: The slight bending of light as it passes around the edge of an object is called diffraction of light.

Question # 7

Why the polaroid sun glasses are better than ordinary sun glasses?

Ans 1: Polaroid sun glasses are better than ordinary sun glasses because they reduce the glare of light entering into the eye as a result of polarization.

Question # 8

What are Newton's rings?

Ans 1: When a plano-convex lens of long focal length is placed in contact with a plane glass plate, a thin air film is enclosed between them to form circular dark and bright fringes known as Newton's rings.

Question # 9

What condition must be met by interfering beams to observe the phenomena of interference?

Ans 1: The following conditions must be met, in order to observe the phenomenon.
1. The interfering beams must be monochromatic, that is, of a single wavelength.
2. The interfering beams of light must be coherent.

Question # 10

Write two steps of Huygen's principle.

Ans 1:
1. Each point of a wave front may be considered as a source of secondary wavelets.
2. The new position of the wave front after a certain interval of time can be found by constructing a surface that touches all the secondary wavelets.

Submit

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ICS Part 1 Physics Short Questions Test

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ICS Part 1 Physics English Medium Chapter 9 Online Short Questions Test with Answers

Online Short Questions For Chapter 9 "ICS Part 1 Physics Chapter 9 Short Questions Test "

Physics - ICS Part 1 Physics Chapter 9 Short Questions Test

Under what conditions two or more sources of light behave as coherent sources?

In Newton's rings, Why are the fringes circular?

Why diffraction grating cannot be used for X-Rays diffraction?

Can you obtain plane polarized light from un-polarized light? If your answer is yes, write the name of two processes by which plane polarized light is obtained.

Why the polaroid sun glasses are better than ordinary sun glasses?

In Newton's rings, Why are the fringes circular?

Write two steps of Huygen's principle.

Define polarization of light.

Write down selective absorption method to obtain plane polarized light from ordinary light.

If white light is incident on a film of irregular thickness at all possible angles,what will be the pattern of interference fringes? Explain your answer.

Prepare Complete Set Wise Questions For Chapter 9 "ICS Part 1 Physics Chapter 9 Short Questions Test "

Set 1

Set 2

Set 3

ICS Part 1 Physics Chapter 9 Short Questions Test - Set 1

Under what conditions two or more sources of light behave as coherent sources?

In Newton's rings, Why are the fringes circular?

Why diffraction grating cannot be used for X-Rays diffraction?

Can you obtain plane polarized light from un-polarized light? If your answer is yes, write the name of two processes by which plane polarized light is obtained.

Why the polaroid sun glasses are better than ordinary sun glasses?

In Newton's rings, Why are the fringes circular?

Write two steps of Huygen's principle.

Define polarization of light.

Write down selective absorption method to obtain plane polarized light from ordinary light.

If white light is incident on a film of irregular thickness at all possible angles,what will be the pattern of interference fringes? Explain your answer.

ICS Part 1 Physics Chapter 9 Short Questions Test - Set 2

Give the list of two substance which shows optical rotation when they are in solution.

What are Newton's rings?

Write the names of any four processes to obtain plane polarized beam of light from un-polarized light.

What condition must be met by interfering beams to observe the phenomena of interference?

If white light is incident on a film of irregular thickness at all possible angles,what will be the pattern of interference fringes? Explain your answer.

How would you manage to get more orders of spectra using a diffraction grating?

Define optical rotation. Give its practical use.

What is difference between interference and diffraction fringes?

Can you obtain plane polarized light from un-polarized light? If your answer is yes, write the name of two processes by which plane polarized light is obtained.

What is Michelson's interferometer? Also write its working principle.

ICS Part 1 Physics Chapter 9 Short Questions Test - Set 3

What is Michelson's interferometer? Also write its working principle.

In Newton's rings, Why are the fringes circular?

What do you mean by coherent source ? Explain a common method for producing two coherent sources.

Can you obtain plane polarized light from un-polarized light? If your answer is yes, write the name of two processes by which plane polarized light is obtained.

How will you increase the fringe width in young's double slit experiment?

What is diffraction of light?

Why the polaroid sun glasses are better than ordinary sun glasses?

What are Newton's rings?

What condition must be met by interfering beams to observe the phenomena of interference?

Write two steps of Huygen's principle.

ICS Part 1 Physics Short Questions Test

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