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Prepared by: learnloophq@gmail.com

Last edited 26 days ago by Learn LoopHQ.

Answer key

Chapter: 02. Physical Quantities And Measurement 1

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Physical Quantities and Measurement - 1: Practice Exam

Instructions: Read each question carefully and answer to the best of your ability.

Total Marks: XX (You can set a total mark based on how you score each question.) Time Limit: XX (You can set a time limit.)

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Section A: Multiple Choice Questions (MCQs)

Choose the correct option for each question.

Which of the following is an SI unit of length? a) Centimetre b) Kilogram c) Metre d) Second

If you want to measure the length of your pencil, which unit would be most suitable? a) Kilometre b) Metre c) Millimetre d) Quintal

What does the ‘Tare’ button on an electronic balance do? a) Turns off the balance b) Resets the reading to zero, ignoring the container’s weight c) Changes the unit of measurement d) Calibrates the balance for heavier objects

Which type of error occurs when you look at a measuring scale from an angle? a) Reading error b) Parallax error c) Calibration error d) Zero error

The space occupied by a flat surface is called its: a) Length b) Volume c) Mass d) Area

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Section B: Fill in the Blanks

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

Any quantity that can be measured is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.

The known fixed quantity used in measurement is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.

1 metre is equal to _ _ _ _ _ _ _ _ _ _ _ _ _ _ centimetres.

The standard unit of mass in the SI system is _ _ _ _ _ _ _ _ _ _ _ _ _ _.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ is the amount of space covered by a flat surface.

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Section C: True or False

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

The length of body parts like hand span were reliable for accurate measurements in earlier times. (T/F)

Mass and weight have the same meaning in physics. (T/F)

To convert grams to milligrams, you divide by 1000. (T/F)

Proper standard weights should have a lead seal stamped by the Weights and Measures Department. (T/F)

When measuring area using graph paper, squares less than half covered should be counted. (T/F)

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Section D: Short Answer Questions

Answer the following questions in 1-2 sentences.

What are the two parts that every measurement value consists of?

Name two instruments commonly used to measure length.

Why should you avoid placing an object on an uneven surface when measuring its length?

What is the SI unit of area?

What is the National Physical Laboratory (NPL) in New Delhi responsible for?

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Section E: Diagram-Based Questions

Observe the image and answer the questions that follow.

Image: An example of measuring length with a ruler.

{

"image_description": "A close-up view of a standard wooden ruler laid flat against a small, red rectangular block. Three different eye positions are indicated by arrows pointing towards the ruler's markings above the block's end. Eye position A is to the left, looking down at an angle; Eye position B is directly above the measurement mark; Eye position C is to the right, looking down at an angle. The block ends precisely at the 6.2 cm mark.",

"style": "photorealistic, clear, precise, educational diagram",

"elements_to_include": ["wooden ruler with cm markings", "red rectangular block", "three eye icons/arrows (A, B, C)", "annotations for measurement readings at each eye position (e.g., A=6.4cm, B=6.2cm, C=6.0cm)"],

"keywords_for_ai_generator": ["ruler measurement", "parallax error diagram", "correct eye position", "measurement accuracy", "physics education"]

}

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Based on the image, which eye position would give an incorrect measurement reading?

What is the correct length of the red block as indicated in the image?

What is the name given to the error caused by incorrect eye positioning during measurement?

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Section F: Long Answer Questions

Answer the following questions in 3-4 sentences.

Explain why the International System of Units (SI units) was introduced.

Differentiate between mass and weight, providing an example of why ‘mass’ is the more appropriate scientific term in a daily context.

Describe how you would measure the approximate area of an irregular leaf using graph paper.

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Section G: Identifying and Differentiating Concepts

Identify whether the following require measurement of Length or Mass: a) The amount of rice in a bag b) The height of your classroom door c) The thickness of a book d) The weight of a fruit

Explain the difference between a multiple and a submultiple of a standard unit, using metre as an example.

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Section H: Everyday Use and Awareness

Imagine you are buying vegetables at a local market. What two things related to the weighing scale and weights should you check to ensure you are getting the correct quantity?

Give two reasons why growing plants in a school garden is important, connecting it to environmental awareness.

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