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Answer key

Chapter: 01. Physical Quantities And Measurement

⁠

CLASS VII: SCIENCE

CHAPTER: PHYSICAL QUANTITIES AND MEASUREMENT

PRACTICE EXAM PAPER

Time Allowed: 1.5 Hours ​Maximum Marks: 50
⁠

SECTION A: MULTIPLE CHOICE QUESTIONS (MCQs)

[5 × 1 = 5 Marks]
Q1. What is the standard SI unit of volume?
a. Metre (m)
b. Square metre (m²)
c. Cubic metre (m³)
d. Litre (L)
Q2. Which of the following liquids forms a convex meniscus when poured into a measuring cylinder?
a. Water
b. Kerosene
c. Mercury
d. Alcohol
Q3. What is the density of aluminium in SI units (
⁠
)?
a. 1.20
b. 920
c. 2700
d. 19300
Q4. To find the volume of an irregular solid that dissolves in water (such as a lump of copper sulphate), which liquid should be used in the measuring cylinder?
a. Kerosene
b. Mercury
c. Water
d. Alcohol
Q5. When the temperature of a substance increases, its density decreases because:
a. Its mass decreases.
b. Its molecules get closer to each other.
c. Its volume decreases.
d. Its molecules speed up and spread apart, increasing its volume.
⁠

SECTION B: FILL IN THE BLANKS

[5 × 1 = 5 Marks]
Q1. The internal volume of a container is called its _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Q2. In CGS and SI units conversion,
⁠
is equal to _ _ _ _ _ _ _ _ _ _ _ _ _ _
⁠
.
Q3. The distance travelled by an object per unit time is known as the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the object.
Q4. To measure the volume of an irregular solid which is too large to be immersed in a measuring cylinder, an _ _ _ _ _ _ _ _ _ _ _ _ _ _ is used.
Q5. The approximate surface area of an irregular flat object, such as a leaf, can be estimated using a _ _ _ _ _ _ _ _ _ _ _ _ _ _.
⁠

SECTION C: TRUE OR FALSE

[5 × 1 = 5 Marks]
Q1. Equal volumes of two different substances will always have the exact same mass. ​Q2.
⁠
is exactly equal to
⁠
. ​Q3. A physical balance is used to directly measure the volume of an irregular solid. ​Q4. Water and kerosene form a concave meniscus when poured into a measuring cylinder. ​Q5.
⁠
of iron contains more matter than
⁠
of peas.
⁠

SECTION D: EXPLAIN THE TERMS

[3 × 2 = 6 Marks]
Q1. Unit Cube ​Q2. Meniscus ​Q3. Density
⁠

SECTION E: DIFFERENTIATE BETWEEN CONCEPTS

[2 × 3 = 6 Marks]
Q1. Concave Meniscus and Convex Meniscus (Give definition and one liquid example for each). ​Q2. Volume and Area (State definitions and their respective SI units).
⁠

SECTION F: DIAGRAM-BASED QUESTIONS

[1 × 4 = 4 Marks]
A transparent graduated cylinder showing a downward-curving liquid boundary inside.
⁠
⁠
⁠
Based on the diagram description above, answer the following questions:
Q1. Identify the type of meniscus formed by the liquid in the measuring cylinder. ​Q2. Name one liquid that would form this specific curve. ​Q3. According to the description, what is the correct volume reading of the liquid? ​Q4. Briefly state how the correct reading of such a meniscus should be taken.
⁠

SECTION G: SHORT ANSWER & NUMERICAL QUESTIONS

[4 × 3 = 12 Marks]
Q1. A measuring cylinder contains
⁠
of water. When a stone of mass
⁠
is lowered into the measuring cylinder, the water level rises to
⁠
. Calculate the density of the stone in
⁠
.
Q2. An aluminium block has a density of
⁠
and a mass of
⁠
. Calculate its volume in
⁠
. (Hint: Convert the density into SI units first).
Q3. A train takes 4 hours to travel from Delhi to Chandigarh. Assuming that the train is moving with a uniform speed of
⁠
, calculate the distance between Delhi and Chandigarh.
Q4. Why is it important for chemists, engineers, and architects to have an understanding of density?
⁠

SECTION H: LONG ANSWER & EVERYDAY USE QUESTIONS

[2 × 3.5 = 7 Marks]
Q1. Describe an activity to estimate the area of an irregular leaf using a graph paper. Explain if this method provides the exact surface area of the leaf.
Q2. A person is driving a car on a highway to reach their destination. Explain the term speed, state its SI unit, and list other commonly used units of speed. If the driver travels
⁠
in 2 hours, calculate the speed of the car.
⁠
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