Class 8 Practice – Level 1 – Light

Total questions: 40

What is light?

• A form of energy

• A solid object

• A type of gas

• A liquid

None

Which of the following is a source of light?

Moon

Star

Lamp

All of the above

None

Light travels in which direction?

In circles

In straight lines

In waves

In zigzag

None

What is the speed of light in a vacuum?

300,000 km/s

150,000 km/s

450,000 km/s

500,000 km/s

None

What do we call objects that do not produce their own light?

• Luminous objects

• Non-luminous objects

• Reflective objects

• Transparent objects

None

What phenomenon is observed when light bounces off a surface?

Refraction

Reflection

Diffraction

Dispersion

None

What is the angle of incidence?

• The angle between the incident ray and the normal

• The angle between the reflected ray and the surface

• The angle between the reflected ray and the normal

• The angle between the light source and the surface

None

Which type of mirror produces a virtual image?

• Concave mirror

• Convex mirror

• Plane mirror

• Both b and c

None

What is a plane mirror?

• A curved mirror

• A flat mirror

• A magnifying mirror

• An opaque mirror

None

10.

What happens to light when it hits a rough surface?

• It reflects evenly

• It scatters

• It passes through

• It disappears

None

11.

What is refraction?

• Bending of light when it passes from one medium to another

• Bouncing of light off a surface

• The spread of light in different directions

• The absorption of light by a material

None

12.

Which of the following is an example of refraction?

• A rainbow

• A mirror reflecting light

• A straw appearing bent in a glass of water

• A light bulb illuminating a room

None

13.

What is the critical angle?

• The angle of incidence that produces a 90-degree angle of refraction

• The maximum angle of incidence

• The angle where light is totally reflected

• The angle of reflection

None

14.

What type of lens converges light rays?

• Concave lens

• Convex lens

• Cylindrical lens

• Plano-convex lens

None

15.

Which lens is used in magnifying glasses?

• Concave lens

• Convex lens

• Plano-concave lens

• Bifocal lens

None

16.

What causes the rainbow?

• Reflection of light

• Refraction and dispersion of light

• Diffraction of light

• Total internal reflection

None

17.

Which color of light has the longest wavelength?

• Red

• Blue

• Green

• Violet

None

18.

What happens when white light passes through a prism?

• It scatters into different colors

• It disappears

• It changes speed

• It reflects completely

None

19.

Which color of light has the shortest wavelength?

• Red

• Yellow

• Blue

• Violet

None

20.

What is the order of colors in a rainbow?

• VIBGYOR

• RGBYOV

• ROYGBIV

• RGBYIV

None

21.

Which instrument is used to measure the angle of reflection?

• Goniometer

• Thermometer

• Barometer

• Micrometer

None

22.

Which type of mirror is commonly used in vehicles for a wider field of view?

• Concave mirror

• Plane mirror

• Convex mirror

• Flat mirror

None

23.

Which of the following is not a use of reflection?

• Looking in a mirror

• Camera

• Solar panel

• Periscope

None

24.

What type of lens is used in eyeglasses for nearsightedness?

• Convex lens

• Concave lens

• Bifocal lens

• Cylindrical lens

None

25.

What is the main function of optical fibers?

• To reflect light

• To refract light

• To transmit light

• To absorb light

None

26.

What is a shadow?

• A reflection of light

• An absence of light

• A color created by light

• A distorted image

None

27.

Which of the following can create a shadow?

• A transparent object

• A translucent object

• An opaque object

• Both b and c

None

28.

The size of a shadow depends on which factor?

• Distance from the light source

• Size of the object

• Angle of light

• All of the above

None

29.

What type of light source can create sharp shadows?

• Diffused light source

• Point light source

• Ambient light source

• Colored light source

None

30.

In which position will the shadow of a person be the longest?

• At noon

• Early morning

• Late afternoon

• At sunset

None

31.

What is the function of the cornea in the eye?

• To detect color

• To focus light

• To protect the eye

• To produce tears

None

32.

What part of the eye contains light-sensitive cells?

• Lens

• Retina

• Iris

• Cornea

None

33.

What does the lens of the eye do?

• Protects the eye

• Changes shape to focus light

• Detects light

• Produces tears

None

34.

Which part of the eye controls the amount of light entering?

• Retina

• Pupil

• Cornea

• Iris

None

35.

What is the primary function of the human eye?

• To hear

• To see

• To smell

• To taste

None

36.

Why is it important to wear sunglasses?

• To look stylish

• To block harmful UV rays

• To enhance vision

• To reduce glare

None

37.

Which light source is safer for the eyes?

• Incandescent bulbs

• Fluorescent bulbs

• LED lights

• Halogen lamps

None

38.

What should you avoid doing when looking at the sun?

• Using sunglasses

• Staring directly

• Using binoculars

• Looking away quickly

None

39.

What type of light is used in emergency exit signs?

• Incandescent light

• Fluorescent light

• Neon light

• LED light

None

40.

What is the purpose of a magnifying glass?

• To dim light

• To enlarge images

• To change color

• To absorb light

None

1 out of 40

Time's up

Class 8 Practice – Level 1 – Light

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