Light - shadow and light

A boy saw a butterfly when he turned on his lamp.

Which of the following shows how the path of light enabled the boy to see the butterfly?

• from lamp to butterfly to boy

• from lamp to boy to butterfly

• from boy to lamp to butterfly

• from boy to butterfly to lamp

A boy switched on the lamp of a room and looked under the bed for his cat. He was not able to see the cat even though the cat was right in front of him.

What was the reason?

• Bed did not allow light to reach the cat.

• The cat absorbed all the light.

• Light from the lamp did not reach the boy.

• Light from the boy is too weak to reach the cat.

In a dark room, a white light source shines a beam of light through a triangular hole to cast light on the screen.

There is a transparent blue glass block between the triangular hole and the screen.

Which of the following image will be shown on the screen?

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In a dark room, a white light source shines a beam of light through a red glass block to cast light on the screen.

There is a wooden sheet with a circular hole between the red glass plane and the screen.

Which of the following image will be shown on the screen?

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Bi Bin walked from position X to position Z directly.

The distance between position X and Y is equal to the distance between position Y to Z.

The graph below shows the variation of length of the shadow of Bi Bin on the floor against time.

Which statement below is correct?

• Bi Bin walked faster between XY than between YZ.

• Point Q represents a position between Y and Z.

• Bi Bin walked faster between YZ than between XY.

• Time taken to walk from X to Y and Y to Z is the same.

Bi Bin walked from position X to position Z.

The graph below shows the variation of length of the shadow of Bi Bin on the floor against time.

Which statement below is incorrect?

• Bi Bin is right under the lamp at point S.

• Bi Bin stopped moving between point Q and R.

• Bi Bin was at position X at point P and position Z at point T.

• Time to travel from X to Y is shorter than the time to travel from Y to Z.

Figure 1 shows light shining on three wooden objects of the same height, A, B and C.

Figure 2 shows the shadow which appears on the screen.

Which of the following is the correct arrangement of the three objects?

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Figure 1 shows light shining on three wooden objects of the same height, A, B and C.

Figure 2 shows the shadow which appears on the screen.

Which of the following is the correct arrangement of the three objects?

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Figure 1 shows light shining on three wooden objects A, B and C. The three wooden objects have different height and placed at different distances away from the torch.

Figure 2 shows the shadow formed on the screen.

Which of the following is the correct arrangement of the three objects?

• A : square 8 cm / B : circle 8 cm / C : vertical bar 8 cm

• A : square 4 cm / B : circle 6 cm / C : vertical bar 8 cm

• A : square 8 cm / B : circle 6 cm / C : vertical bar 4 cm

• A : vertical bar 4 cm / B : circle 2 cm / C : square 1 cm

Figure 1 shows light shining on three cards A, B and C. The cards are hung at different distances from the torch.

Figure 2 shows three different shapes of the same height cut off from the cards.

Which of the following is the possible shadow shown on the screen?

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