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

What is the usual way to obtain plane wavefront from a point source?

Ans 1: A usual way to obtain a plane wavefront is to place a point source of light at the focus of a convex lens. The rays coming out of the lens will constitute plane waves.

Question # 2

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 # 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

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 # 5

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 # 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

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 # 8

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 # 9

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 # 10

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

Ans 1:

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

Question # 1

What is the usual way to obtain plane wavefront from a point source?

Ans 1: A usual way to obtain a plane wavefront is to place a point source of light at the focus of a convex lens. The rays coming out of the lens will constitute plane waves.

Question # 2

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 # 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

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 # 5

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 # 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

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 # 8

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 # 9

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 # 10

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

Ans 1:

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

Question # 1

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 # 2

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 # 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

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 # 5

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 # 6

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 # 7

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.

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

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.

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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

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 # 3

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 # 4

Write two uses of X-rays diffraction by crystals.

Ans 1: X-ray diffraction has been very useful in determining the structure of biologically important molecules such as hemoglobin and double helix structure of DNA.

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

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 # 7

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 # 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

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.

Question # 10

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.

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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

What is the usual way to obtain plane wavefront from a point source?

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

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

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

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

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

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.

Define wave front and spherical wave front.

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

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

What is the usual way to obtain plane wavefront from a point source?

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

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

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

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

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

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.

Define wave front and spherical wave front.

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

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

Write two steps of Huygen's principle.

What is diffraction of light?

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

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

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

What is polarization of light?

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

Define polarization of light.

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

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

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

What are conditions for detectable interference of light?

What is difference between interference and diffraction fringes?

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

Write two uses of X-rays diffraction by crystals.

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 diffraction grating cannot be used for X-Rays diffraction?

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?

What are Newton's rings?

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

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

ICS Part 1 Physics Short Questions Test

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