light-sound-heat-l2 MCQ — 10 अभ्यास प्रश्न उत्तर सहित

10 light-sound-heat-l2 बहुविकल्पीय प्रश्नों का अभ्यास करें, विस्तृत उत्तर और व्याख्या सहित। RAS/RPSC परीक्षा की तैयारी के लिए आदर्श।

10 प्रश्न mathematics-science-reet

Q1. Match the child observation with the concept: Asha sees a shadow; Imran sees same-size mirror image; Karan tightens a rubber band.

A Shadow-refraction; mirror image-convection; tight band-conduction.

B Shadow-noise; mirror image-temperature; tight band-evaporation.

C Shadow-blocked light; mirror image-reflection; tight band-higher pitch. Correct

D Shadow-radiation; mirror image-sublimation; tight band-condensation.

Explanation

The correct match keeps each child’s activity in its own concept family. Asha’s shadow comes from blocked light, Imran’s mirror observation from reflection, and Karan’s pitch change from vibration frequency.

Q2. Assertion: Curtains and soft boards may reduce classroom noise. Reason: Soft surfaces can absorb part of the sound energy instead of reflecting it strongly.

A Both are false.

B Both are true, and the reason explains the assertion. Correct

C The assertion is true, but the reason is about refraction of light.

D The assertion is false, but the reason is true for boiling water.

Explanation

The assertion and reason fit together. Devika’s suggestion of curtains or soft boards is a classroom application of reducing reflected sound and making group work easier.

Q3. Which option best distinguishes conduction, convection and radiation?

A Conduction uses contact, convection uses moving fluid, radiation can occur without a material medium. Correct

B Conduction is only for light, convection only for sound, radiation only for mirrors.

C All three require a steel rod and no temperature difference.

D All three mean the same thing at Class 6 level.

Explanation

This hard item is about mechanism, not memorised names. Conduction, convection and radiation are all heat transfer, but the route of transfer is different in each case.

Q4. Imran says a thermometer measures heat directly. What correction is most accurate?

A A thermometer measures the colour of a hot body.

B A thermometer measures temperature, a reliable measure of hotness or coldness. Correct

C A thermometer measures the loudness of boiling water.

D A thermometer measures only whether metal is a conductor.

Explanation

The correction is that a thermometer measures temperature. Imran’s misconception is common because heat and temperature are used loosely in daily speech, but science separates them.

Q5. Devika writes: “A convex mirror makes an erect and smaller image.” How should the teacher respond?

A Reject it because every mirror always gives same-size images.

B Accept it for a convex mirror and ask her to connect it with field of view. Correct

C Change it to echo because smaller image means softer sound.

D Call it evaporation because the image disappears.

Explanation

The teacher should accept Devika’s statement for a convex mirror and extend it to use, such as wider field of view. The distractors confuse plane mirrors, sound and phase change.

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Q6. Asha places cardboard between a torch and a wall. Which idea best explains the shadow?

A Cardboard blocks light travelling from the torch.

B Cardboard produces its own darkness like a source.

C The wall bends sound coming from the torch.

D The torch cools the wall and makes a patch.

Q7. A teacher wants a safe heat activity for Class 6. Which choice is best?

A Use boiling oil so students feel heat quickly.

B Ask children to touch a live electric heater.

C Skip activity and dictate the definition ten times.

D Use warm water with steel, wood and plastic under teacher supervision.

Q8. Which current NCERT science series title should be used for middle-stage source citations?

A Curiosity science series for Grades 6, 7 and 8.

B Any old Science title without edition note.

C Only senior-secondary Physics Part I.

D Only mathematics books because this paper also has mathematics.

Q9. Meena dips a steel spoon and a wooden stick into warm water. Which observation supports conduction?

A The wooden stick begins to shine brightly.

B Both objects produce echo at the same time.

C The plastic label becomes transparent immediately.

D The dry upper end of the steel spoon becomes warmer sooner.

Q10. Which statement pair is correct about sound?

A Sound travels through vacuum; vibration is optional.

B Sound needs only brightness; medium is irrelevant.

C Sound is produced by vibration; it needs a material medium to travel.

D Sound is always pleasant; unwanted sound is reflection.

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light-sound-heat-l2 MCQ — 10 अभ्यास प्रश्न उत्तर सहित

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light-sound-heat-l2 MCQ — 10 अभ्यास प्रश्न उत्तर सहित

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