CBSE Class 10 - Science - Unit 10 - Online Tests - “Light Reflection and Refraction”

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CBSE Class 10 - Science - Unit 10 - Online Tests - “Light Reflection and Refraction”

Light with wavelength of 6000 A0 units has a frequency :

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5 x 10¹⁷ Hz

5 x 10¹⁶ Hz

5 x 10¹⁵ Hz

5 x 10¹⁴ Hz

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At what distance from a screen will a 27 Cd lamp provide the same illumination as a 75 Cd lamp 15 m from the screen ?

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9 m

6 m

3 m

1 m

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Monochromatic light of frequency 5 x 10⁴ Hz travelling in vacuum enters a medium of refractive index 1.5. Its wavelength in the medium is :

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5000 A0

4000 A0

5500 A0

6000 A0

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The focal length of a concave mirror is f and the distance of the object to the principal focus is p . Then the ratio of the size of the image to the size of the object is :

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p/p

p/f

(?pf)

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A blue object on a white background when seen through a blue filter will appear :

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Black on a blue background

Blue on a white background

Blue on a red background

Invisible

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In a photometer two sources of light when placed at 30 and 50 cm respectively produce shadow of equal intervals. Their candles are in the ratio of

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9/25

16/25

3/5

6/25

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Spherical air bubble in water will act as :

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A concave lens.

A convex lens

Plane-concave lens

Plane glass plate

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The number of images observable between two parallel mirrors is :

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Infinity

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Laser is :

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Coherent and monochromatic only

Intense and monochromatic only

Intense and coherent only

Intense coherent and monochromatic

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The focal length of a plano-convex lens having a radius of curvature of 10 cm for convex surface and a refractive index of 1.5 will be :

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20 cm

15 cm

10 cm

5 cm

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Total internal reflection of light is possible when light enters from :

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Water to air

Air to water

Vacuum to air

Air to glass

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When white light moves through vacuum :

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Violet has greater speed than red

Red has greater speed than violet

All colours have the same speed

Different colours have different random speeds

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A hole is made in a convex lens . Then :

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A hole appears in the image

Image size decreases

Image intensity decreases

No change

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Which of the given is not true of an image formed by a plane mirror ?

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It is erect

It is virtual

It is diminished

It is at the same distance as the object

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Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is :

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100 cm

25 cm

50 cm

30.3 cm

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What is the minimum distance between an object and its virtual image in case of a concave lens ?

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A parallel beam of light is incident on a converging lens parallel to its principal axis. As we move away from the lens on the other side on its principal axis the intensity of light

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Remains constant

Continuously increases

Continuously decreases

First increases and then decreases

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A convex lens of power P is immersed in a water . How will its power change ?

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Increases

Remain unchanged

Decreases

Increases for red colour and decreases for blue colour

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The focal length of the object of microscope is

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Greater than the focal length of eyepiece

Less than the focal length of eyepiece

Equal to the focal length of eyepiece

Arbitrary

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Light waves spreading from two sources produce interference only if they are :

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Coherent

Transverse

Longitudinal

None of these

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A lens has a power of +0.5D. It is:

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A concave lens of local length 5 m

A convex lens of focal length 2 m

A convex lens of focal length 5 m

A concave lens of focal length 2 m

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A hunter wants to shoot a fish whose image can be seen through clear water. It is to be aimed:

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Below the image of fish

Above the image of fish

Directly towards the image

In any direction

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Refractive index:

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Depends on the wavelength of light used to measure

Is actual property of the substance

Depends on the angle of incidence

None of these

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Which of the given is NOT paired correctly?

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Solar furnace-concave mirror

Rear -view mirror-convex mirror

Magnifying glass -convex lens

None of these

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A concave lens from the image of an object which is :

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Virtual inverted and diminished

Virtual upright and diminished

Virtual inverted and enlarged

Virtual upright and enlarged

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