Important Questions: CBSE Class 6 Science Chapter 7 Temperature and its Measurement

Temperature and its Measurement is Chapter 7 in the NCERT Class 6 Science textbook and introduces the scientific method of quantifying how hot or cold an object is. While earlier classes relied on touch, this chapter formalises measurement using thermometers and the Celsius scale. In typical CBSE Class 6 Science term exams (80 marks, 3 hours for full syllabus or 40 marks, 90 minutes for half-yearly), this chapter contributes around 3-5 marks. The distribution usually includes one 1-mark MCQ or fill-in-the-blank, one 2-mark question on thermometer types or reading technique, and occasionally a 3-mark question linking temperature to daily life (like fever, weather, or cooking). Diagram-based questions — labelling parts of a clinical thermometer or showing how to read the mercury level — are extremely common. Schools often combine this chapter with Chapter 4 (Sorting Materials into Groups) or Chapter 8 (Winds, Storms and Cyclones) for integrated questions on physical properties. Understanding the exact range of clinical (35°C to 42°C) and laboratory thermometers (-10°C to 110°C) is non-negotiable for scoring full marks.

One-mark questions test recall of definitions, ranges, and quick identification of thermometer types. CBSE Class 6 Science papers typically include 10-15 MCQs across all chapters, so expect at least one from Temperature and its Measurement. These questions are straightforward if you have memorised the normal body temperature (37°C), the boiling point of water (100°C), freezing point (0°C), and the specific ranges of clinical and laboratory thermometers. Fill-in-the-blank and true/false variants also appear. The key is precision: writing '37 degrees' without the Celsius symbol or stating the clinical thermometer range as 35-45°C instead of 35-42°C will cost you the mark. Always use the degree Celsius symbol (°C) and exact NCERT values. CBSE mark schemes are strict on units and numerical accuracy at this level to build foundational scientific writing habits.

Two-mark questions require brief explanations, typically two distinct points or one point with an example. CBSE examiners look for clarity and correct terminology straight from the NCERT textbook. For instance, when asked why a clinical thermometer has a kink, students must mention that the kink prevents immediate backflow of mercury so the reading remains visible after removal from the body. Stating 'it stops the mercury' without explaining why is incomplete and fetches only 1 mark. Similarly, differentiating between clinical and laboratory thermometers demands mentioning both range and presence/absence of the kink. Always structure your answer in two clear sentences or bullet points. Avoid long paragraphs; examiners prefer point-wise brevity in 2-mark answers. Use the exact NCERT terms: 'bulb', 'stem', 'kink', 'Celsius scale', 'mercury thread'. Writing 'tube' instead of 'stem' or 'temperature line' instead of 'scale' can appear vague and lose marks for imprecision.

Three-mark questions test your ability to apply concepts to new situations or explain processes step-by-step. Expect questions like 'Describe the correct method to measure body temperature using a clinical thermometer' or 'Draw a labelled diagram of a clinical thermometer and explain the function of the kink'. CBSE awards 1 mark for the diagram (if neat and correctly labelled), 1 mark for naming parts (bulb, stem, kink, scale), and 1 mark for the explanation. When writing procedural answers, use numbered steps: this makes your answer easy to evaluate and less likely to miss a step. Always mention safety points where relevant — for example, never use a clinical thermometer to measure the temperature of boiling water as it will break. Conceptual questions might ask you to distinguish between heat and temperature: heat is a form of energy that flows from hotter to colder objects, while temperature is a measure of how hot or cold something is. Missing this distinction costs marks because CBSE specifically tests whether students grasp that heat and temperature are related but not identical.

Five-mark questions are rare in Class 6 but appear in some CBSE-affiliated schools' internal assessments and in integrated question papers. These typically combine diagram drawing, explanation, and application. A classic 5-mark question might provide a short paragraph about a child with fever and ask students to (a) identify the correct thermometer, (b) explain the measurement procedure, (c) state normal vs fever temperature, and (d) suggest why the kink is important in this context. Each sub-question carries 1-1.5 marks. Case-based questions test real-world literacy: for example, a passage describing how a doctor measures temperature in a clinic, followed by sub-questions on sterilisation, reading technique, and safety. When answering, divide your response into clearly labelled parts (a), (b), (c) matching the question structure. Write in complete sentences but stay concise — aim for 2-3 sentences per sub-part. Always relate your answer back to NCERT content; if the case mentions Fahrenheit, clarify that NCERT Class 6 focuses on Celsius, and conversion is beyond the syllabus. This shows the examiner you understand scope and avoids unnecessary confusion.

CBSE question-setters follow a predictable pattern for Temperature and its Measurement based on Bloom's Taxonomy levels. Knowledge and comprehension questions (MCQs, VSAs) test recall of definitions, ranges, and identification of thermometer types. Application-level questions ask students to choose the correct thermometer for a given scenario or describe measurement procedures. Analysis questions require comparison (clinical vs laboratory thermometer) or cause-and-effect reasoning (why mercury is used, why kink is present). Diagram-based questions are especially common because they simultaneously test drawing skills, labelling accuracy, and understanding of instrument structure. CBSE examiners also love 'precaution' and 'safety' questions: 'State two precautions while using a thermometer' or 'Why should we handle a thermometer carefully?'. These assess whether students appreciate the fragility of glass instruments and hygiene in body-temperature measurement. Starting 2023, some CBSE schools introduced competency-based questions with small real-life contexts, like reading a thermometer image or interpreting a temperature chart of a patient over three days. The mark scheme is strict: every stated fact must match NCERT terminology, diagrams must be neat with pencil, and numerical answers must include units.

Mistake 1: Forgetting to show the kink in clinical thermometer diagrams. Many students draw a straight tube without the constriction near the bulb; this costs the labelling mark. Always draw a small bend or constriction and label it 'kink'. Mistake 2: Confusing the ranges — writing that a laboratory thermometer measures 35°C to 42°C or a clinical thermometer measures up to 100°C. Memorise: clinical is 35-42°C, laboratory is -10 to 110°C. Mistake 3: In procedural answers, students write 'put thermometer in mouth' without mentioning washing, jerking to reset, waiting time, or eye-level reading. CBSE expects step-by-step completeness for full marks. Mistake 4: Using loose language like 'thermometer tube' instead of 'stem', or 'heat ball' instead of 'bulb'. Stick to NCERT terms. Mistake 5: Not writing units. If the answer is 37, always write 37°C; omitting °C may lose the mark. Mistake 6: Reading the thermometer at an angle instead of eye level, causing parallax error — this is a concept CBSE loves to test. Mistake 7: Stating that mercury is safe; actually, mercury is toxic if the thermometer breaks, which is why digital thermometers are replacing mercury ones. NCERT mentions mercury thermometers, so you write about them in exams, but always add a safety note if asked about handling.

Diagrams fetch easy marks if drawn neatly and labelled correctly. For the clinical thermometer, draw an elongated bulb at one end, a thin stem, a visible kink (small constriction) near the bulb, and a scale marked from 35°C to 42°C along the stem. Use a pencil and ruler for straight lines. Label: Bulb (where mercury is stored), Stem (the narrow glass tube), Kink (constriction that prevents backflow), Scale (Celsius markings from 35 to 42). Some schools ask for the direction of arrow showing increasing temperature; draw an arrow from 35 to 42. For the laboratory thermometer, draw a similar structure but without the kink and extend the scale from -10°C to 110°C. Label: Bulb, Stem, Scale. Avoid shading or colouring unless specifically asked. Keep the diagram at least 6-8 cm long so labels are readable. Examiners deduct marks for cramped, unlabelled, or incorrect diagrams. Practice drawing these at least five times before the exam so your hand is steady and labels are clear. If the question says 'draw and label', you must do both; just drawing without labels or labelling without drawing earns zero. If it says 'explain the function of any one labelled part', pick the kink for clinical or the bulb, write one clear sentence, and you secure that mark.

Use this checklist one day before your exam to ensure you have covered all testable points. First, can you define temperature in one sentence? (Temperature is the measure of how hot or cold an object is.) Second, do you know the ranges by heart? (Clinical: 35-42°C; Laboratory: -10 to 110°C.) Third, can you list three differences between clinical and laboratory thermometers without looking at your notes? (Range, presence of kink, usage context.) Fourth, can you draw both thermometers from memory and label all parts correctly? Fifth, do you remember key temperatures: normal body (37°C), freezing point of water (0°C), boiling point of water (100°C)? Sixth, can you write the step-by-step procedure to measure body temperature in four sentences? Seventh, do you understand why we cannot use a clinical thermometer for hot liquids? (Range limit, risk of breaking.) Eighth, can you explain what a kink does and why laboratory thermometers lack one? (Kink holds the reading; lab thermometers are read while in the substance, so no kink needed.) Ninth, do you know two precautions while using any thermometer? (Handle carefully to avoid breakage; read at eye level to avoid parallax.) Tenth, have you practised at least ten important questions with answers written out in full sentences? If yes to all ten, you are exam-ready.

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