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Question (21)

QN00711

The patterns formed inside a kaleidoscope change when the tube is rotated because

(A) mirrors become curved
(B) coloured pieces move and reflect differently
(C) light stops travelling
(D) the tube becomes transparent

Correct Answer: B

Explanation:

Changing object positions changes reflections.

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Question (22)

QN00712

A student places dull mirrors inside a kaleidoscope. The patterns observed will most likely be

(A) brighter and sharper
(B) dim and unclear
(C) enlarged greatly
(D) invisible completely

Correct Answer: B

Explanation:

Dull mirrors reflect less light.

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Question (23)

QN00713

Which useful item below is based mainly on regular reflection?

(A) Kaleidoscope
(B) Periscope
(C) Both kaleidoscope and periscope
(D) Pinhole camera only

Correct Answer: C

Explanation:

Both use regular reflection from mirrors.

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Question (24)

QN00714

Why are coloured beads placed at one end of a kaleidoscope?

(A) To absorb light
(B) To create decorative reflected patterns
(C) To block reflection
(D) To enlarge images

Correct Answer: B

Explanation:

Reflections of coloured beads create patterns.

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Question (25)

QN00715

In a periscope, if one mirror is removed, the viewer will

(A) see brighter images
(B) not see the object properly
(C) observe magnified images
(D) get coloured patterns

Correct Answer: B

Explanation:

Both mirrors are necessary for reflection.

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Question (26)

QN00716

Which application of kaleidoscope is connected to art and design?

(A) Measuring sound
(B) Creating decorative pattern ideas
(C) Detecting underground water
(D) Producing electric current

Correct Answer: B

Explanation:

Designers use kaleidoscope patterns for decoration.

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Question (27)

QN00717

A student observes that a periscope image becomes dim. Which change can improve brightness?

(A) Use rough mirrors
(B) Use polished mirrors
(C) Use black paper only
(D) Increase cardboard thickness

Correct Answer: B

Explanation:

Polished mirrors reflect more light.

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Question (28)

QN00718

Which property of light allows a periscope to function correctly?

(A) Reflection from smooth surfaces
(B) Absorption by mirrors
(C) Refraction through cardboard
(D) Scattering by glass beads

Correct Answer: A

Explanation:

Smooth surfaces produce regular reflection.

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Question (29)

QN00719

Traditional Indian decorative crafts often use mirror patterns similar to kaleidoscope designs because of

(A) repeated symmetrical reflections
(B) magnetic attraction
(C) heat conduction
(D) sound reflection

Correct Answer: A

Explanation:

Repeated reflections create symmetrical designs.

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Question (30)

QN00720

A science exhibition model uses a periscope to demonstrate how light

(A) bends in water
(B) travels through vacuum only
(C) changes direction after reflection
(D) produces shadows in darkness

Correct Answer: C

Explanation:

Reflection changes the direction of light rays.

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Question (21)

The patterns formed inside a kaleidoscope change when the tube is rotated because

Explanation:

Link:

Question (22)

A student places dull mirrors inside a kaleidoscope. The patterns observed will most likely be

Explanation:

Link:

Question (23)

Which useful item below is based mainly on regular reflection?

Explanation:

Link:

Question (24)

Why are coloured beads placed at one end of a kaleidoscope?

Explanation:

Link:

Question (25)

In a periscope, if one mirror is removed, the viewer will

Explanation:

Link:

Question (26)

Which application of kaleidoscope is connected to art and design?

Explanation:

Link:

Question (27)

A student observes that a periscope image becomes dim. Which change can improve brightness?

Explanation:

Link:

Question (28)

Which property of light allows a periscope to function correctly?

Explanation:

Link:

Question (29)

Traditional Indian decorative crafts often use mirror patterns similar to kaleidoscope designs because of

Explanation:

Link:

Question (30)

A science exhibition model uses a periscope to demonstrate how light

Explanation:

Link:

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