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Prepared by: learnloophq@gmail.com

Last edited 26 days ago by Learn LoopHQ.

Answer key

Chapter: 03. Physical Quantities And Measurement 2

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Physical Quantities and Measurement - 2: Practice Exam Paper

Instructions:

Read each question carefully.

Attempt all questions.

Write your answers clearly in the space provided.

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Section A: Multiple Choice Questions (5 Marks)

Choose the correct option for each question.

What is the standard unit of time in the SI system? a) minute b) hour c) second d) day

A clinical thermometer is typically marked with a temperature range from: a) 0° C to 100° C b) -10° C to 110° C c) 35° C to 42° C d) 30° C to 50° C

The slight bend or kink in a clinical thermometer, called a constriction, is there to: a) Make the thermometer stronger. b) Prevent the mercury from rising too high. c) Ensure the mercury level stays after taking the reading. d) Allow the thermometer to measure very low temperatures.

Which of the following is the most precise device for measuring time, based on atomic vibrations? a) Sundial b) Pendulum clock c) Digital watch d) Atomic clock

To record a very short time interval, like a runner’s sprint time in a race, which instrument is best used? a) Wall clock b) Stopwatch c) Sundial d) Hourglass

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Section B: Fill in the Blanks (5 Marks)

Complete the following sentences with the correct word(s).

Time is defined as the _ _ _ _ _ _ _ _ _ _ _ _ _ _ between two events.

A mean solar day is the time taken by the Earth to complete one _ _ _ _ _ _ _ _ _ _ _ _ _ _ about its own axis.

Temperature is the degree of _ _ _ _ _ _ _ _ _ _ _ _ _ _ or coldness of a body.

The normal human body temperature is _ _ _ _ _ _ _ _ _ _ _ _ _ _ or 98.6° F.

Heat transfer always takes place from a body with _ _ _ _ _ _ _ _ _ _ _ _ _ _ temperature to a body with _ _ _ _ _ _ _ _ _ _ _ _ _ _ temperature.

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Section C: True or False (5 Marks)

State whether the following statements are True (T) or False (F).

A clinical thermometer can be used to measure the temperature of boiling water. (T/F)

Electronic or digital watches are generally more accurate than old pendulum clocks. (T/F)

It is safe to throw mercury from a broken thermometer directly into the dustbin. (T/F)

The SI standard unit of temperature is Degree Celsius. (T/F)

Stopwatches are used to record the exact time an event starts and ends. (T/F)

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Section D: Short Answer Questions (10 Marks)

Answer the following questions in one or two sentences.

What is the purpose of measuring temperature in our daily life?

Give one reason why the 24-hour clock format is preferred in some professions.

What is a “parallax error” when reading a thermometer?

How can you tell if a person has a fever using a clinical thermometer?

Name one advantage of using a digital thermometer over a mercury clinical thermometer.

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Section E: Diagram-Based Questions (5 Marks)

Observe the image and answer the questions.

This is a diagram showing a thermometer with different parts labeled.

{

"image_description": "A clear, labeled diagram of a mercury-in-glass thermometer. Key parts are pointed out: 'Bulb' (bottom), 'Constriction' (just above bulb), 'Capillary tube' (narrow tube where mercury rises), and 'Scale' (markings along the stem). The mercury column is visible within the capillary tube.",

"style": "scientific illustration, clear lines",

"elements_to_include": ["Bulb", "Constriction", "Capillary tube", "Scale", "Mercury column"],

"keywords_for_ai_generator": ["thermometer diagram", "mercury thermometer", "clinical thermometer parts", "constriction", "capillary tube", "bulb", "temperature measurement"]

}

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Identify the part labeled ‘Constriction’ in the diagram.

What is the main function of the part labeled ‘Constriction’ in this type of thermometer?

What kind of thermometer is most likely represented in this diagram, based on the presence of the ‘Constriction’?

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Section F: Long Answer Questions (10 Marks)

Answer the following questions in 4-5 sentences.

Explain the key differences in construction and use between a laboratory thermometer and a clinical thermometer.

Differentiate between “heat” and “temperature” as physical quantities. How do they relate to each other in terms of energy transfer?

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