How Things Work
CBSE · Class 4 · EVS
Practice quiz for How Things Work — CBSE Class 4 EVS. MCQs and questions with answers to test your preparation.
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Quick Quiz: How Things Work
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Which of these objects can spin properly?
What happens to a coin when it spins and starts to slow down?
Which position of the toothpick hole makes a spinner work better?
What is a charkha used for?
Sample Questions
Which of these objects will float in water?
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Leaf
A leaf will float in water because it is light and has air trapped in it. Iron nails, stones, and coins are heavy and will sink.
What happens to an empty steel bowl when placed in water?
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It floats
An empty steel bowl floats because it traps air inside, making it lighter than the water it displaces. Even though steel is heavy, the air makes it float.
Which of these factors affect floating and sinking? (Select all correct answers)
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Weight of the object, Shape of the object
Both weight and shape affect whether an object floats or sinks. Light objects tend to float, and changing shape (like with aluminum foil) can make the same object float or sink. Color and container size don't affect floating or sinking.
What happens to aluminum foil when it is pressed tightly into a ball?
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It sinks
When aluminum foil is pressed tightly into a ball, it sinks because it becomes denser and traps less air. The same foil floats when spread out or made into a cup shape.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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