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

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

Ans 1:

Question # 2

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 # 3

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 # 4

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 # 5

Define wave front and spherical wave front.

Ans 1: Wave Front: Such a surface on which all the points have same phase of vibration is known as wavefront.

Spherical wave fronts: If a point source is sending out waves in three dimensions, the wave fronts are spheres centered on the source. Such wave fronts are called a spherical wave fronts.

Question # 6

What do you mean by the term wavefront and ray of light?

Ans 1: Such a surface on which all the points have same phase of vibration is known as wavefront.
A line normal to wavefront including the direction of motion is called a ray of light.

Question # 7

Explain whether the Young's experiment is an experiment for studying interference or diffraction effect of light.

Ans 1: Mainly, Young's experiment was performed to study the interference of light.However, it also involves diffraction.So diffraction can also be studied by this experiment because when light passes through the slit, it bends towards the corner.

Question # 8

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 # 9

In Young's experiment, one of the slits is covered with blue filter and other red filter, what would be the pattern of light intensity on the screen?

Ans 1: No interference pattern will be observed because blu and red lights are of different wavelengths. So the source of light will not be coherent

Question # 10

How would you distinguish between un-polarizedand plane polarized lights?

Ans 1: Un-Polarized lights: A beam of ordinary light consists of electric and magnetic vibrations which are perpendicular to the direction of propagation. It is called un-polarized light.

Plane Polarized lights: The beam of light in which all vibrations are confined to one plane of vibration is called plane polarized 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

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

Ans 1:

Question # 2

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 # 3

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 # 4

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 # 5

Define wave front and spherical wave front.

Ans 1: Wave Front: Such a surface on which all the points have same phase of vibration is known as wavefront.

Spherical wave fronts: If a point source is sending out waves in three dimensions, the wave fronts are spheres centered on the source. Such wave fronts are called a spherical wave fronts.

Question # 6

What do you mean by the term wavefront and ray of light?

Ans 1: Such a surface on which all the points have same phase of vibration is known as wavefront.
A line normal to wavefront including the direction of motion is called a ray of light.

Question # 7

Explain whether the Young's experiment is an experiment for studying interference or diffraction effect of light.

Ans 1: Mainly, Young's experiment was performed to study the interference of light.However, it also involves diffraction.So diffraction can also be studied by this experiment because when light passes through the slit, it bends towards the corner.

Question # 8

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 # 9

In Young's experiment, one of the slits is covered with blue filter and other red filter, what would be the pattern of light intensity on the screen?

Ans 1: No interference pattern will be observed because blu and red lights are of different wavelengths. So the source of light will not be coherent

Question # 10

How would you distinguish between un-polarizedand plane polarized lights?

Ans 1: Un-Polarized lights: A beam of ordinary light consists of electric and magnetic vibrations which are perpendicular to the direction of propagation. It is called un-polarized light.

Plane Polarized lights: The beam of light in which all vibrations are confined to one plane of vibration is called plane polarized light.

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

Question # 1

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 # 2

What do you mean by the term wavefront and ray of light?

Ans 1: Such a surface on which all the points have same phase of vibration is known as wavefront.
A line normal to wavefront including the direction of motion is called a ray of light.

Question # 3

How can the distance between interference fringes affect by the separation between the slits of young's experiment? Can fringes disappear?

Ans 1:

Question # 4

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

Ans 1:

Question # 5

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 # 6

Center of Newton ring is dark. Why? Although thickness of air film is zero.

Ans 1:

Question # 7

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 # 8

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 # 9

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 # 10

What is polarization of light?

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

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

Question # 1

What are conditions for detectable interference of light?

Ans 1: For detectable interference,light beam should be
- Monochromatic
- Coherent

Question # 2

How can the distance between interference fringes affect by the separation between the slits of young's experiment? Can fringes disappear?

Ans 1:

Question # 3

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 # 4

What is polarization of light?

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

Question # 5

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 # 6

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 # 7

Can visible light produce interference fringes? Explain.

Ans 1: Yes visible light or what light can produce interference fringes. But each color will produce its own interference fringe pattern. Theses patterns overlap to give rise to a resultant diffused coloured interference pattern.

Question # 8

What is the contribution of Michelson to measure the length of standard meter using interferometer?

Ans 1: Michelson measured the length of the standard meter in terms of wavelength of red cadmium light and showed that the standard meter is equal to 1553163.5 wavelengths of this light.

Question # 9

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 # 10

Center of Newton ring is dark. Why? Although thickness of air film is zero.

Ans 1:

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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

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

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.

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

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

Define wave front and spherical wave front.

What do you mean by the term wavefront and ray of light?

Explain whether the Young's experiment is an experiment for studying interference or diffraction effect of light.

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

In Young's experiment, one of the slits is covered with blue filter and other red filter, what would be the pattern of light intensity on the screen?

How would you distinguish between un-polarizedand plane polarized lights?

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

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

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.

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

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

Define wave front and spherical wave front.

What do you mean by the term wavefront and ray of light?

Explain whether the Young's experiment is an experiment for studying interference or diffraction effect of light.

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

In Young's experiment, one of the slits is covered with blue filter and other red filter, what would be the pattern of light intensity on the screen?

How would you distinguish between un-polarizedand plane polarized lights?

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

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

What do you mean by the term wavefront and ray of light?

How can the distance between interference fringes affect by the separation between the slits of young's experiment? Can fringes disappear?

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

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

Center of Newton ring is dark. Why? Although thickness of air film is zero.

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

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

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

What is polarization of light?

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

What are conditions for detectable interference of light?

How can the distance between interference fringes affect by the separation between the slits of young's experiment? Can fringes disappear?

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

What is polarization of light?

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.

Can visible light produce interference fringes? Explain.

What is the contribution of Michelson to measure the length of standard meter using interferometer?

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

Center of Newton ring is dark. Why? Although thickness of air film is zero.

ICS Part 1 Physics Short Questions Test

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