Physics | Optics

Practice Physics | Optics on Bissoy — browse topics below and open any question.

Questions

Which among the following statements is correct?

ক

NaCl is a paramagnetic substance

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Paramagnetic substances behave like an insulator

গ

Cobalt is an Antiferromagnetic substance

ঘ

On heating, ferrimagnetic substanceslose ferrimagnetism

Which of the following cannot be used for making lenses?

ক

Plastic

খ

Soil

গ

Glass

ঘ

Water

Which one of the following is the correct sequence of passage of light in a compound microscope?

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Condenser -Objective lens -Eye -piece -Body tube

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Objective lens -Condenser -Body tube -Eye piece

গ

Condenser -Objective lens -Body tube -Eyepiece

ঘ

Eyepiece -Objective lens -Body tube -Mirror

What is the reason for formation of Mirage in desert?

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Refraction of light

খ

Reflection of light

গ

Total internal reflection of light

ঘ

Both Refraction and Total internal reflection of light

The side mirrors of vehicles are of which type of mirrors?

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Convex

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Concave

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Plane

ঘ

Inverted

Myopia is a defect of eyes which is also known as

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Far Sightedness

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Near Sightedness

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Astigmatism

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Night Blindness

Which glass is used to make spectacles?

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Crook's glass

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Potash glass

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Jena glass

ঘ

Soda glass

Find the position of the image formed by a concave mirror when the object is placed between P and F?

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At infinity

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Between F and C

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Behind the mirror

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Beyond C

What is the principal focus of a spherical mirror?

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It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror

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It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection or appear to be arising from this point on the principal axis

গ

It is the centre of a hollow sphere of which the spherical mirror is a part

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It is the midpoint of a spherical mirror

In a concave mirror when the object is placed at infinity which of the following applies to the image?

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Real, inverted, highly enlarged image at center of curvature (C)

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Real, inverted image of the same size at centre of curvature (C)

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Real, inverted, diminished image between centre of curvature (C) and principal focus (F)

ঘ

Real, inverted, highly diminished image at focus

Which combination of colour is the most convenient during day and night time?

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Orange and blue

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White and black

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Yellow and blue

ঘ

Red and green

Which one of the following reflects back more sunlight as compared to other three?

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Sand desert

খ

Paddy crop land

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Land covered with fresh snow

ঘ

Prairie land

Eclipses occur due to which optical phenomena?

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Reflection

খ

Refraction

গ

Rectilinear propagation

ঘ

Diffraction

The type of mirrors used in the headlamp of cars is

ক

Parabolic concave

খ

Plane

গ

Spherical convex

ঘ

Cylindrical concave

A star appears twinkling in the sky because of

ক

Scattering of light by atmosphere

খ

Reflection of light by atmosphere

গ

Refraction of light by atmosphere

ঘ

Diffraction of light by atmosphere

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