Class 10 physics Quiz

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Refraction

If an incident ray passes through the focus the reflected ray will *

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Pass through the pole

Be parallel to the principal axis

Retrace it's path

Pass through the centre of curvature

A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it *

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Goes straight into the second medium

Bends towards the normal

Bends away from the normal

Does not enter at all

When an object is placed between the pole and focus of a concave mirror the image formed is *

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Behind the mirror

Virtual and erect

Larger than the object or magnified

All the above

At 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of mirror . The focal length of this mirror is *

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-30 cm

-20 cm

-40 cm

-60 cm

In case of reflection of light , the angle of incidence (i) and the angle of reflection (r) are related as *

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i = r

i < r

i > r

No definite relation

The angle of refraction for the given ray diagram is *

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Name of student *

The angle between an incident ray and the plane mirror is 30°. The total angle between the incident ray and refracted ray will be *

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30°

60°

90°

120°

If a light ray is moving through two medium which different refractive indices , which of the factors remains constant? *

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Wavelength

Frequency

Speed

Both a and b

Band of seven colours is called *

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VIBGYOR

Spectrum

Dispersion

Reflection

Refractive index of material is greatest for *

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Red light

Green light

Violet light

Same for all colours

What is the velocity of light in a diamond if the refractive index of diamond with respect to vacuum is 2.5 ? *

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1.2 × 10^8 m/s

5 × 10^8 m/s

1.2 × 10^10 m/s

2.5 × 10^8 m/s

Class 10 A or B *

10 A

10 B

Light travels slower in glass than in air because *

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Refractive index of air is less than that of glass

Refractive index of air is greater than that of glass

Density of glass is greater than that of air

Density of glass is less than that of air

Magnification produced by a rear view mirror fitted in vehicles *

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Is less than one

Is more than one

Is equal to one

None of these

A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be *

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Greater than unity

Less than unity

Equal to unity

Zero

The refractive index of honey is 1.47 calculate the speed of light when it enters honey from air ?

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2.04×10^8 m/s

1.04×10^8 m/s

2.4×10^8 m/s

4.4×10^8 m/s

Clear selection

Beam of light striking the reflecting surface is called *

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Reflecting ray

Incident ray

Refracted ray

Normal ray

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