Hard

Temperature and its Measurement — Hard

15 questions 18 min PYQ-grade reasoning

Q1. Consider the following statements about telling hot or cold by touch. I. In summer, tap water may feel hotter than water from a matka or refrigerator. II. The sense of touch always tells the correct temperature of water. III. Activity 7.1 shows that the same water can feel cool to one hand and warm to the other. Which statements are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q2. Consider the following statements about a laboratory thermometer. I. It consists of a long, narrow, uniform glass tube which is sealed. II. One end of the tube has a bulb that contains a liquid. III. Outside the bulb, a narrow column of liquid can be seen in the tube. Which of the statements is/are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q3. Asha is using a digital clinical thermometer to measure her own temperature. Arrange the following steps in the correct order. I. Reset the thermometer by pressing the reset button. II. Wash the tip with soap and water. III. Place the thermometer under the tongue and close the mouth. IV. Wait till the thermometer beeps or flashes a light.
- A. I, II, III, IV
- B. II, I, III, IV
- C. III, IV, II, I
- D. II, III, I, IV
Q4. Ravi has to measure a temperature of exactly 22.5 degrees C. He has three laboratory thermometers — (a) least count 1 degrees C, (b) least count 0.5 degrees C, (c) least count 2 degrees C. Which one should he use?
- A. Thermometer (a)
- B. Thermometer (b)
- C. Thermometer (c)
- D. Any of the three, because all have the same range
Q5. Vaishnavi is unwell. Her recorded body temperatures are: Day 1 at 7 pm — 40.0 degrees C; Day 2 at 10 am — 38.8 degrees C; Day 3 at 7 am — 37.6 degrees C and at 10 pm — 36.6 degrees C. What inference fits?
- A. Her temperature stayed almost constant for three days
- B. Her temperature was highest on Day 2 at 7 pm
- C. Her highest temperature was on Day 1 at 7 pm; by Day 3 her temperature returned to normal
- D. She had no fever on Day 1
Q6. Komal tells you, 'I have a fever of 101 degrees.' Without further information, on which scale does she most likely mean this value?
- A. Celsius scale
- B. Kelvin scale
- C. Fahrenheit scale
- D. Either scale would be reasonable for a human fever
Q7. Assertion (A): A clinical thermometer cannot be used to measure the temperature of boiling water or of ice. Reason (R): The temperatures of boiling water and of ice lie outside the range of a clinical thermometer.
- A. Both A and R are true, and R is the correct explanation of A.
- B. Both A and R are true, but R is NOT the correct explanation of A.
- C. A is true, R is false.
- D. A is false, R is true.
Q8. Assertion (A): In scientific work, temperature is usually expressed in kelvin. Reason (R): Kelvin is the SI unit of temperature.
- A. Both A and R are true, and R is the correct explanation of A.
- B. Both A and R are true, but R is NOT the correct explanation of A.
- C. A is true, R is false.
- D. A is false, R is true.
Q9. Assertion (A): During the COVID-19 pandemic, infrared (non-contact) thermometers were widely used at the entrance of public places. Reason (R): Non-contact thermometers can measure a person's temperature without touching the body and thus reduce the risk of spreading infection.
- A. Both A and R are true, and R is the correct explanation of A.
- B. Both A and R are true, but R is NOT the correct explanation of A.
- C. A is true, R is false.
- D. A is false, R is true.
Q10. A laboratory thermometer has 50 small divisions between 0 degrees C and 100 degrees C. What does each division of this thermometer measure?
- A. 0.5 degrees C
- B. 1.0 degrees C
- C. 2.0 degrees C
- D. 5.0 degrees C
Q11. Five students in Shillong measure the temperature of boiling water with the same setup and record 97.8, 98.0, 97.9, 98.0 and 98.1 degrees C. What is the most reasonable inference?
- A. All five thermometers were broken
- B. Boiling water does not have a fixed temperature
- C. All five students may not have followed the correct way of reading the thermometer
- D. Boiling water at Shillong always boils at 97.8 degrees C
Q12. Consider the following statements about human body temperature. I. The temperature of a healthy human body is taken to be 37.0 degrees C. II. Body temperature is influenced by age, time of the day and activity level. III. The temperature of human beings normally goes below 35 degrees C or above 42 degrees C. Which statements are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q13. Consider the following statements about writing temperature in English. I. The names of the scales — Celsius, Fahrenheit, Kelvin — start with a capital letter. II. The full word 'degree' in 'degree Celsius' starts with a small letter. III. The symbol K for kelvin is written with a degree sign (degrees K). Which statements are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q14. While measuring the temperature of warm water in a beaker, Asha notices that the liquid column in the laboratory thermometer begins to fall as soon as she lifts the thermometer out of the water. What does this tell her?
- A. The thermometer is faulty
- B. Warm water does not have a fixed temperature
- C. The temperature must be read while the thermometer is still immersed in the water
- D. The bulb has cracked from the inside
Q15. On a laboratory thermometer, bigger marks are every 5 degrees C and smaller marks every 1 degrees C. The top of the red column lies exactly midway between the 25 degrees C mark and the next bigger mark above. What temperature does it show?
- A. 25.0 degrees C
- B. 27.5 degrees C
- C. 28.0 degrees C
- D. 30.0 degrees C

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