Observe the picture given in the figure carefully.

A patch of light is obtained at B when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light?

1

(a)

A wooden board

(b)

A glass sheet

(c)

A mirror

(d)

A sheet of white paper

Paheli observed the shadow of a tree at 8:00 AM, 12:00 noon and 3:00 PM. Which of the following statements is closest to her observation about the shape and size of the shadow?

1

(a)

The shape of the shadow of the tree changes but the size remains the same.

(b)

The size of the shadow of the tree changes but the shape remains the same.

(c)

Both the size and shape of the shadow of the tree change.

(d)

Neither the shape nor the size of the shadow changes.

 Which one of the following is the natural source of light?

1

(a)

Sun

(b)

Tubelight

(c)

Electric bulb

(d)

None of these

In lateral inversion:

1

(a)

Image is upside down

(b)

Image bends laterally

(c)

Left of an object appears right of the image

(d)

Image gets inverted

Shadow of a red object will be:

1

(a)

Red

(b)

White

(c)

Yellow

(d)

Black

Pinhole camera forms_____________ image.

1

(a)

inverted

Shadows are formed by _________________object.

1

(a)

opaque

Rubber is _______________but glass is__________

1

(a)

opaque, transparent

Sun is a___________ object.

1

(a)

luminous

Light helps us to__________________objects.

1

(a)

see

Light is not a form of energy.

1

(a) True

(b) False

Light travels in the form of rectilinear propagation.

1

(a) False

(b) True

Non-luminous objects emit the light of their own.

1

(a) True

(b) False

Lateral inversion is a phenomenon of changing left to right and vice-versa.

1

(a) False

(b) True

Images are similar to shadows.

1

(a) True

(b) False

When does lunar eclipse occur ?

1

(a)

When earth comes between sun and moon

Can you form image in a transparent material?

1

(a)

No, clear image cannot be formed

What are transparent materials?

1

(a)

Materials that allow light to pass through them are called transparent materials. We can see clearly through them. For example. Glass.

Why can not we see upside down image of the sun?

1

(a)

     

Can you see a reflected light directly? If, no Why?

1

(a)

       

Mention the name of an object which partially allows the light to pass through it.

2

(a)

Briefly state that what a dark part of shadow is called as.

2

(a)

If an object is of two different colours, then what will be the colour of shadow?

2

(a)

In a complete dark room, we are not able to see our face. Why?

2

(a)

Give two effects of light on plants.

2

(a)

Distinguish between transparent and translucent object

2

(a)

On a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances, can we see their shadow on the ground?

3

(a)

Suggest a situation where we obtain more than one shadow of an object at a time.

3

(a)

A torch is placed at two different positions A and B one by one as shown in figure.The shape of the shadow obtained in two positions is shown in the given figure.
Match the position of the torch and shape of the shadow of the ball.

3

(a)

1. Differentiate between a shadow and an image.

   4

   (a)

2. Differentiate between a luminous and non-luminous objects.

   4

   (a)

Explain with the help of a diagram that how can we see an image behind wall using a periscope.

5

(a)

What is a shadow? Explain a simple process for shadow formation.

5

(a)