CLASS VII SCIENCE

CHAPTER XI: LIGHT: SHADOWS AND REFLECTIONS

Direct Questions Assertion / Reason Correct / Incorrect HOTS Challenging

DIRECT QUESTIONS

An object that gives out its own light is called a:

A. Luminous object

B. Non-luminous object

C. Transparent object

D. Opaque object

Answer: A. Luminous object

Which of the following is a non-luminous object?

A. Sun

B. Stars

C. Moon

D. Glowing bulb

Answer: C. Moon

Objects through which we cannot see at all are:

A. Transparent

B. Translucent

C. Opaque

D. Lustrous

Answer: C. Opaque

Materials that allow light to pass through them partially are called:

A. Transparent

B. Translucent

C. Opaque

D. Shiny

Answer: B. Translucent

Light travels in a:

A. Curved line

B. Straight line

C. Zig-zag line

D. Random manner

Answer: B. Straight line

A shadow is formed when:

A. An opaque object comes in the path of light

B. A transparent object comes in the path of light

C. Light passes through a lens

D. It is a very sunny day

Answer: A. An opaque object comes in the path of light

Which of the following is a transparent material?

A. Water

B. Wood

C. Rubber

D. Cardboard

Answer: A. Water

The dark patch formed behind an opaque object when placed in light is:

A. Image

B. Shadow

C. Reflection

D. Glow

Answer: B. Shadow

What is needed to see a shadow?

A. A source of light

B. An opaque object

C. A screen

D. All of the above

Answer: D. All of the above

A pinhole camera works on the principle that:

A. Light reflects from surfaces

B. Light travels in straight lines

C. Light is made of seven colors

D. Shadows are always black

Answer: B. Light travels in straight lines

The image formed in a pinhole camera is:

A. Erect and real

B. Inverted and real

C. Erect and virtual

D. Inverted and virtual

Answer: B. Inverted and real

Bouncing back of light from a shining surface is called:

A. Refraction

B. Reflection

C. Dispersion

D. Absorption

Answer: B. Reflection

A mirror ________ the direction of light that falls on it.

A. Stops

B. Changes

C. Absorbs

D. Refracts

Answer: B. Changes

The color of a shadow is always:

A. Same as the object

B. White

C. Black/Dark

D. Red

Answer: C. Black/Dark

A smooth and polished surface that reflects light is:

A. Wood

B. Mirror

C. Paper

D. Wall

Answer: B. Mirror

Which of the following will form a shadow?

A. Glass sheet

B. Clean air

C. A piece of rock

D. Clear water

Answer: C. A piece of rock

Shadows give us information about the ________ of the object.

A. Color

B. Shape

C. Weight

D. Texture

Answer: B. Shape

The shape and size of a shadow depend on:

A. The shape of the object

B. The position of the light source

C. The distance between the object and the screen

D. All of the above

Answer: D. All of the above

We can see objects because of:

A. Reflection

B. Shadows

C. Refraction

D. Darkness

Answer: A. Reflection

An example of a translucent object is:

A. Ground glass

B. Tracing paper

C. Frosted window

D. All of the above

Answer: D. All of the above

ASSERTION AND REASON

A. Both A and R are true and R is the correct explanation of A.

B. Both A and R are true but R is not the correct explanation of A.

C. A is true but R is false.

D. A is false but R is true.

Assertion (A): We cannot see a shadow in a dark room.

Reason (R): A source of light is required for the formation of a shadow.

Answer: A. Both A and R are true and R is the correct explanation of A.

Assertion (A): Clear glass is an opaque object.

Reason (R): Opaque objects do not allow light to pass through them.

Answer: D. A is false but R is true.

Assertion (A): The image in a pinhole camera is inverted.

Reason (R): Light travels in straight lines.

Answer: A. Both A and R are true and R is the correct explanation of A.

Assertion (A): A mirror changes the direction of light.

Reason (R): Reflection occurs when light hits a polished surface.

Answer: A. Both A and R are true and R is the correct explanation of A.

Assertion (A): Shadows are always the same size as the object.

Reason (R): The size of the shadow depends on the distance of the light source.

Answer: D. A is false but R is true.

CORRECT / INCORRECT STATEMENTS

Which of the following statements is INCORRECT?

A. Light travels in straight lines.

B. Transparent objects cast dark shadows.

C. A mirror reflects light.

D. Shadows are formed by opaque objects.

Answer: B. Transparent objects cast dark shadows.

Identify the CORRECT statement:

A. Moon is a luminous source of light.

B. Images are different from shadows.

C. Pinhole camera requires a lens to work.

D. Reflection cannot happen on a rough surface.

Answer: B. Images are different from shadows.

Which of the following about shadows is CORRECT?

A. They show the exact details of the object.

B. They are formed only on a screen.

C. They can be of different colors.

D. They do not require a light source.

Answer: B. They are formed only on a screen.

Find the INCORRECT statement:

A. Air and water are transparent.

B. Wood and metals are opaque.

C. Tracing paper is transparent.

D. Smoke is translucent.

Answer: C. Tracing paper is transparent.

HOTS (HIGHER ORDER THINKING SKILLS)

Why can we see our face in a shiny stainless steel plate but not on a wooden table?

A. Steel reflects light regularly while wood absorbs or scatters it.

B. Steel is colder than wood.

C. Wood is transparent.

D. Steel creates a shadow of our face.

Answer: A. Steel reflects light regularly while wood absorbs or scatters it.

If you are holding a mirror in your hand in a completely dark room, can you see your reflection?

A. Yes, because mirrors always reflect.

B. No, because there is no light to be reflected by the mirror.

C. Yes, if I look closely.

D. No, because the mirror turns opaque in the dark.

Answer: B. No, because there is no light to be reflected by the mirror.

How does a shadow change when the object is moved closer to the source of light?

A. It becomes smaller.

B. It becomes larger.

C. It disappears.

D. It stays the same size.

Answer: B. It becomes larger.

Why are shadows sometimes misleading?

A. They are always black.

B. They only show the outline and can make different objects look similar.

C. They move faster than the object.

D. They only appear at night.

Answer: B. They only show the outline and can make different objects look similar.

A bird flying high in the sky does not cast a shadow on the ground. Why?

A. Birds are transparent.

B. The bird is too far from the ground (the screen), so the shadow is too faint to be seen.

C. Light does not fall on birds.

D. Birds fly faster than light.

Answer: B. The bird is too far from the ground (the screen), so the shadow is too faint to be seen.

CHALLENGING QUESTIONS

Which of the following is a "natural" pinhole camera?

A. A mirror in a room.

B. Small patches of sunlight under a leafy tree.

C. A puddle of water.

D. A window with curtains.

Answer: B. Small patches of sunlight under a leafy tree.

What happens to the image in a pinhole camera if the hole is made very large?

A. The image becomes sharper.

B. The image becomes blurred and bright.

C. The image disappears.

D. The image remains the same.

Answer: B. The image becomes blurred and bright.

In a mirror reflection, if you raise your right hand, the image appears to raise its:

A. Right hand

B. Left hand

C. Both hands

D. No hands

Answer: B. Left hand (Lateral Inversion)

Which property of light is responsible for the formation of eclipses?

A. Reflection

B. Rectilinear propagation (traveling in straight lines)

C. Dispersion

D. Refraction

Answer: B. Rectilinear propagation (traveling in straight lines)

If an object is placed 2 meters in front of a plane mirror, the distance between the object and its image is:

A. 2 meters

B. 4 meters

C. 1 meter

D. 0 meters

Answer: B. 4 meters