Samacheer Kalvi 7th Science Term 1 Unit 1 Book Back Question and Answers:

Samacheer Kalvi 7th Standard Science Book Back 1 Mark and 2 Mark Question & Answers uploaded online and available PDF for free download. Class 7th New Syllabus Science Term 1 book back question & answer solutions guide available below for English Medium. Class Seventh Std Science English Medium Term 1 Unit 1 Measurement book back answers given below. Students looking for class 7th Term I Unit 1 Questions and Answers can check below.

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Samacheer Kalvi 7th Science Book Back Term I Unit 1 Solutions Guide PDF:

TN State Board Class 7th Science Subject Term 1 Unit 1 one mark and two mark solutions guide PDF available below.

Science – Term 1

Unit 1 Measurement

I. Choose the appropriate answer:

1. Which of the following is a derived unit?
(a) mass
(b) time
(c) area
(d) length
Answer:
(c) area

2. Which of the following is correct?
(a) 1L=lcc
(b) 1L= l0cc
(c) 1L= l00cc
(d) 1L= l000cc
Answer:
(d) 1L = 1000cc

3. SI unit of density is
(a) kg/m²
(b) kg/m³
(c) kg/m
(d) g/m³
Answer:
(b) kg/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
Answer:
(b) 2:1

5. Light year is the unit of
(a) Distance
(b) time
(c) density
(d) both length and time
Answer:
(a) Distance

II. Fill in the blanks:

1. The volume of irregularly shaped objects is measured using the law of ___________
2. One cubic metre is equal to ___________ cubic centimeter.
3. The density of mercury is ___________
4. One astronomical unit is equal to ___________
5. The area of a leaf can be measured using a ___________

Answer:

1. Archimedes
2. 10,00,000 or 106⁶
3. 13,600 kg/m³
4. 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.
Answer:
(False) Correct statement: The region covered by the boundary of the plane figure is called its area.

2. Volume of liquids can be found using measuring containers.
Answer:
True

3. Water is denser than kerosene.
Answer:
True

4. A ball of iron floats in mercury.
Answer:
True

5. A substance that contains less number of molecules per unit volume is said to be denser.
Answer:
False. Correct statement: A substance that contains more molecules per unit volume is said to be denser.

IV. Match the following items:

Answer:

1 – i; 2 – ii; 3 – iii; 4 – iv; 5 – v

Answer:

1 – i; 2 – ii; 3 – iii; 4 – iv; 5 – v

V. Arrange the following in the correct sequence :

1. 1L, 100 cc, 10 L, 10 cc
Answer:
10 cc, 100 cc, 1L, 10L

2. Copper, Aluminium, Gold, Iron
Answer:
Aluminium, Iron, Copper, Gold

VI. Use the analogy to fill in the blank:

1. Area: M² :: Volume : _________
Answer:
M³

2. Liquid : Litre :: Solid : _________
Answer:
cm³

3. Water: Kerosene :: ______ : Aluminium
Answer:
Iron

VII. Assertion and reason-type questions:
Mark the correct choice as

(a) Both assertion and reason are true and the reason is the correct explanation of the assertion
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion
(c) If the assertion is true but the reason is false
(d) Assertion is false but the reason is true.

1. Assertion (A): The volume of a stone is found using a measuring cylinder.
Reason (R): Stone is an irregularly shaped object.
Answer:
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion

2. Assertion (A): Wood floats in water.
Reason (R): Water is a transparent liquid.
Answer:
(b) If both assertion and reason are true, but the reason is not the correct explanation of the assertion
Correct explanation: The density of water is more than the density of the wood.

3. Assertion (A): Iron ball sinks in water.
Reason (R): Water is denser than iron.
Answer:
(b) If both assertion and reason are true, but the reason is not the correct explanation of the assertion
Correct explanation: The density of iron is more than that of water.

VIII. Answer very briefly: 

1. Name some of the derived quantities.
Answer:
Area, volume, density.

2. Give the value of one light year.
Answer:
One light year = 9.46 x 10¹⁵m

3. Write down the formula used to find the volume of a cylinder.
Answer:
Volume of a cylinder = πr² h

4. Give the formula to find the density of objects.
Answer:

5. Name the liquid in which an iron ball sinks.
Answer:
The iron ball sinks into the water. The density of an iron ball is more than that of water so it sinks in water.

6. Name the unit used to measure the distance between celestial objects.
Answer:
Astronomical units and light years are the units used to measure the distance between celestial objects.

7. What is the density of gold?
Answer:
The density of gold is 19,300 kg/m³

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