Measurement

Samacheer Book Back Questions And Answers For Science Standard 7 Term 1 “Measurement“

I. Choose the appropriate answer:
1. Which of the following is a derived unit?
(a) Mass
(b) Time
(c) Area
(d) Length

2. Which of the following is correct?
(a) 1L= l cc
(b) 1L= 10 cc
(c) 1L= l00 cc
(d) 1L= l000 cc

3. SI unit of density is
(a) kg/m²
(b) kg/m³
(c) kg/m
(d) g/m³

4. Two spheres have equal mass and volume in the ratio 2:1. The ratio of their density is
(a) 1:2
(b) 2:1
(c) 4:1
(d) 1:4

5. Light year is the unit of
(a) Distance
(b) Time
(c) Density
(d) Both length and time

II. Fill in the blanks:
1. Volume of irregularly shaped objects are measured using the law of _____.
2. One cubic metre is equal to _____ cubic centimetre.
3. Density of mercury is _____.
4. One astronomical unit is equal to _____.
5. The area of a leaf can be measured using a _____.

Answers:
1. Archimedes
2. 10⁶
3. 13,600 kg/m³
4. 1.496×10¹¹m
5. Graph sheet

III. State whether the following statements are true or false:
1. The region covered by the boundary of the plane figure is called its volume.
2. Volume of liquids can be found using measuring containers.
3. Water is denser than kerosene.
4. A ball of iron floats in mercury.
5. A substance which contains less number of molecules per unit volume is said to be denser.

Answers:
1. False (The region covered by the boundary of plane figure is called its area)
2. True
3. True
4. True
5. False (A substance which contains more number of molecules per unit volume is said to be denser)

IV. (1) Match the items in column – I to the items in column – II:
Column -1       Column – II
1. Area             A. Light year
2. Distance       B. m³
3. Density        C. m²
4. Volume        D. kg
5. Mass            E. kg/m³

Answers:
1. C
2. A
3. E
4. B
5. D

(2) Match the items in column – I to the items in column – II:
Column -1        Column – II
1. Area             A. g/cm³
2. Length         B. Measuring jar
3. Density        C. Amount of a substance
4. Volume        D. Rope
5. Mass            E. Plane figures

Answers:
1. E
2. D
3. A
4. B
5. C

V. Arrange the following in correct sequence:
1. 1L, 100 cc, 10 L, 10 cc
2. Copper, Aluminium, Gold, Iron

Answers:
1. 10 cc, 100 cc, 1L, 10L
2. Aluminium, Iron, Copper, Gold

VI. Use the analogy to fill in the blank:
1. Area: m²:: Volume: _____.
2. Liquid: Litre:: Solid: _____.
3. Water: Kerosene:: ______ : Aluminium.

Answers:
1. m³
2. cm³
3. Iron

VII. Assertion and reason type questions:
Mark the correct choice as
(a) Both assertion and reason are true and reason is the correct explanation of assertion
(b) Both assertion and reason are true, but reason is not the correct explanation of assertion
(c) If assertion is true but reason is false
(d) Assertion is false but reason is true.

1. Assertion (A): Volume of a stone is found using a measuring cylinder.
Reason (R): Stone is an irregularly shaped object.
2. Assertion (A): Wood floats in water.
Reason (R): Water is a transparent liquid.
3. Assertion (A): Iron ball sinks in water.
Reason (R): Water is denser than iron.

Answers:
1. (a) If both assertion and reason are true and reason is the correct explanation of assertion
2. (b) If both assertion and reason are true, but reason is not the correct explanation of assertion
(Density of water is more than the density of wood)
3. (b) If both assertion and reason are true, but reason is not the correct explanation of assertion
(Density of iron is more than that of water)

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