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Question (11)

QN0033872

A student makes three spinners. - Spinner A – Circular, hole at the centre - Spinner B – Circular, hole near the edge - Spinner C – Circular, hole at the centre but with one side folded Which spinner is expected to spin the best?

(A) Spinner A
(B) Spinner B
(C) Spinner C
(D) All three equally well

Correct Answer: A

Explanation:

A circular spinner with the hole exactly at the centre and no imbalance spins the best.

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Question (12)

QN0033873

Meena places the following objects in water. - Empty plastic bottle with lid closed - Bottle completely filled with water and lid closed Which statement is most likely to be correct?

(A) Both will certainly float.
(B) Both will certainly sink.
(C) The empty bottle is more likely to float than the full bottle.
(D) The full bottle is more likely to float than the empty bottle.

Correct Answer: C

Explanation:

The empty bottle contains air, making it more likely to float.

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Question (13)

QN0033874

Which of the following observations suggests that an experiment has been carried out carefully?

(A) Guessing the result without testing
(B) Recording only successful results
(C) Predicting first, then observing and recording the actual result
(D) Copying another student's observations

Correct Answer: C

Explanation:

Scientific activities involve prediction, observation and recording of results.

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Question (14)

QN0033875

A group wants to make a paper boat that floats for a longer time. Which practice should they follow?

(A) Make holes in the boat.
(B) Fold the boat carefully so that it keeps its shape.
(C) Dip the paper in water before making the boat.
(D) Tear one side of the boat.

Correct Answer: B

Explanation:

A properly folded and balanced boat is more likely to float well.

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Question (15)

QN0033876

Which of the following objects from daily life mainly works because it spins?

(A) School bag
(B) Ceiling fan
(C) Notebook
(D) Lunch box

Correct Answer: B

Explanation:

A ceiling fan works by rotating its blades rapidly.

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Question (16)

QN0033877

A student says, "Every object made of metal will sink in water." Which example from the chapter proves that this statement is not always correct?

(A) Iron nail
(B) Empty steel bowl
(C) Stone
(D) Coin

Correct Answer: B

Explanation:

An empty steel bowl can float because of its shape.

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Question (17)

QN0033878

Four students suggest different ways to improve a spinner. P. Keep the toothpick at the centre. Q. Make the spinner balanced on all sides. R. Bend one side of the spinner downward. S. Fix the toothpick firmly. Which set of suggestions is correct?

(A) P and R only
(B) Q and R only
(C) P, Q and S only
(D) P, R and S only

Correct Answer: C

Explanation:

A balanced spinner with the toothpick fixed at the centre spins more smoothly.

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Question (18)

QN0033879

A child changes only the colour pattern on a spinner while keeping its size, shape and hole position unchanged. What is most likely to change?

(A) The spinner will stop spinning.
(B) The appearance of the colours while spinning.
(C) The material of the spinner.
(D) The weight of the toothpick.

Correct Answer: B

Explanation:

Different colour patterns create different visual effects during spinning.

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Question (19)

QN0033880

Which of the following best explains why students compare different boat designs after making them?

(A) To find whose boat looks the prettiest.
(B) To identify strengths, weaknesses and possible improvements.
(C) To decide whose paper is costlier.
(D) To colour all boats in the same way.

Correct Answer: B

Explanation:

Comparing designs helps students improve stability, strength and performance.

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Question (20)

QN0033881

Which statement correctly summarises an important idea learned from this chapter?

(A) Only light objects float in water.
(B) All round objects spin equally well.
(C) Careful observation, testing and changing designs help us understand how things work.
(D) Heavy objects can never float.

Correct Answer: C

Explanation:

The chapter encourages learning through observation, experimentation, comparison and improvement rather than memorising rules.

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Question (11)

A student makes three spinners. - Spinner A – Circular, hole at the centre - Spinner B – Circular, hole near the edge - Spinner C – Circular, hole at the centre but with one side folded Which spinner is expected to spin the best?

Explanation:

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Question (12)

Meena places the following objects in water. - Empty plastic bottle with lid closed - Bottle completely filled with water and lid closed Which statement is most likely to be correct?

Explanation:

Link:

Question (13)

Which of the following observations suggests that an experiment has been carried out carefully?

Explanation:

Link:

Question (14)

A group wants to make a paper boat that floats for a longer time. Which practice should they follow?

Explanation:

Link:

Question (15)

Which of the following objects from daily life mainly works because it spins?

Explanation:

Link:

Question (16)

A student says, "Every object made of metal will sink in water." Which example from the chapter proves that this statement is not always correct?

Explanation:

Link:

Question (17)

Four students suggest different ways to improve a spinner. P. Keep the toothpick at the centre. Q. Make the spinner balanced on all sides. R. Bend one side of the spinner downward. S. Fix the toothpick firmly. Which set of suggestions is correct?

Explanation:

Link:

Question (18)

A child changes only the colour pattern on a spinner while keeping its size, shape and hole position unchanged. What is most likely to change?

Explanation:

Link:

Question (19)

Which of the following best explains why students compare different boat designs after making them?

Explanation:

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Question (20)

Which statement correctly summarises an important idea learned from this chapter?

Explanation:

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