MCQ
A and R
Short answers
Case Based
10
Which instrument is used to measure body temperature?
a) Laboratory thermometer
b) Clinical thermometer
c) Hygrometer
d) Barometer
b) Clinical thermometer
10
Assertion: Digital thermometers are replacing mercury thermometers
Reason: Temperature in digital thermometer is determined with the help of UV sensors
A is true but R is false
10
Why is alcohol preferred over mercury in some thermometers?
Safer than mercury, not toxic.
10
Arjun kept a glass of cold water in the sun. After some time, he measured the water temperature as 25°C. He also checked the outdoor temperature, which was 35°C.
1) Which thermometer should Arjun use to measure the water temperature?
Laboratory thermometer
10
The normal temperature of the human body is:
a) 35°C
b) 36°C
c) 37°C
d) 38°C
c) 37°C
10
Assertion: Air temperature is measured using room thermometers.
Reason: A room thermometer is designed to measure the temperature of the surrounding air.
A and R are true and R is correct explanation of A
10
Why should a clinical thermometer be shaken before use?
Clinical thermometer should be shaken before use so that level of mercury falls back to zero and we can measure temperature accurately.
10
2) What happens to the liquid inside a thermometer when temperature rises?
The liquid expands and rise up in the tube
10
The range of laboratory thermometer is from:
a)–20 °C to 100 °C.
b) –10 °C to 110 °C.
c) 10 °C to - 110 °C
d) 0 °C to 10 °C.
b) –10 °C to 110 °C.
10
Assertion: A clinical thermometer can be used for measuring the temperature of boiling water.
Reason: The temperatures of boiling water and ice are outside the range of a clinical thermometer.
A is false but R is true
10
Why must a laboratory thermometer be read while it is still immersed in the liquid, unlike a clinical thermometer?
1) It does not have a kink .
2) When it is taken out of the liquid, the mercury or alcohol level falls immediately as it cools down.
3) So, the correct temperature can only be read while it is still inside the liquid.
10
3) Convert 35°C into Kelvin.
K=35+273 K=308 K.
10
The correct way of measuring temperature using lab thermometer is:
a) Bulb of thermometer should touch bottom of beaker
b) Bulb should touch sides of beaker
c) Do not note temperature if thermometer is immersed in water.
d) Thermometer should be held vertically and not tilted.
d) Thermometer should be held vertically and not tilted.
10
Assertion: The temperature of every person may not be 37.0 °C.
Reason: The body temperature is influenced by several factors, such as age, time of the day and activity level.
A and R are true and R is correct explanation of A
10
If the temperature outside is 38°C, what would the corresponding temperature be in Kelvin?
Given:
Temperature in Celsius (°C) = 32°C
To Find:
Temperature in Kelvin (K) = ?
Formula:
K=°C+273K = °C + 273K=°C+273
Solution:
K=32+273 K = 305 K
Answer: The temperature in Kelvin is 305 K.
10
Why does the temperature of water increase when kept in the sun?
Because water absorbs sun heat