MCQ
light-sound-heat-l2 MCQ - Practice Questions with Answers
Solve 30 light-sound-heat-l2 questions for RAS/RPSC preparation.
Practice questions
Q1Assertion: Curtains and soft boards may reduce classroom noise. Reason: Soft surfaces can absorb part of the sound energy instead of reflecting it strongly.
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.
Q2Which statement correctly describes reflection in a plane-mirror activity?
Reflection is the return of light from a surface into the same medium, as seen with a plane mirror. The exact misconception in the traps is light versus sound, while the other traps confuse reflection with refraction or with heat and temperature.
Q3Which current NCERT science series title should be used for middle-stage source citations?
The current NCERT middle-stage science textbook series is titled "Curiosity". The older title it replaced is not current.
Q4A student places a cardboard sheet between a torch and a wall, and a clear shadow forms on the wall. What is the best classification of cardboard in this situation?
An opaque material does not let light pass through it, so it can make a clear shadow. Transparent, luminous and heat-conducting are different ideas and do not explain why the torch light is blocked.
Q5How many of the following classroom conclusions are scientifically correct? 1. A thermometer gives a more reliable comparison of hotness than touch. 2. Heat flows from a hotter body to a colder body when there is contact or another transfer path. 3. A steel handle is safer than a wooden handle because steel is a poor conductor.
Statements I and II are correct because temperature is the reliable measure of hotness and heat transfer is driven by temperature difference. Statement III fails because steel is a good conductor; wood or plastic handles are safer for reducing conduction.
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More questions
6Which statement pair is correct about sound?
7How many of the following statements are correct? I. An opaque material can form a clear shadow. II. Sound needs a material medium to travel. III. Radiation needs a material medium. IV. A thermometer measures temperature, not heat.
8Which arrangement best shows that light travels in straight lines in a simple school experiment?
9A large arrow card points to the left. A student looks at its image in a plane mirror. What should the teacher expect the student to report?
10A teacher wants students to connect vibration with sound using a safe classroom activity. Which activity is most suitable?
11A student says, "The metal railing and the wooden bench have different temperatures because the metal feels colder." What should a teacher correct first?
12Match the child observation with the concept: Asha sees a shadow; Imran sees same-size mirror image; Karan tightens a rubber band.
13A child sees an upright image of a pencil in a plane mirror. Which property should also be expected in ordinary classroom observation?
14Devika writes: “A convex mirror makes an erect and smaller image.” How should the teacher respond?
15Imran says a thermometer measures heat directly. What correction is most accurate?