# Tamil Nadu Board Class 7 Science Chapter 1 Measurements

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Which of the following is a derived quantity?

• a) mass
• b) time
• c) area
• d) length

Which of the following is correct?

• a) 1L = 1cc
• b) 1L = 10 cc
• c) 1L = 100 cc
• d) 1L = 1000 cc

SI unit of density is………..

• a) kg/m2
• b) kg/m3
• c) kg/m
• d) g/m3

Two spheres have 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

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 ______________.[Archimedes]
2. One cubic metre is equal to _____________ cubic centimetre.[1,000,000]
3. Density of mercury is _______________.[13,600 kg/m3]
4. One astronomical unit is equal to _______.[149.6 million kilometers]
5. The area of a leaf can be measured using a ________________________.[graph sheet or by approximation]

[III] State true or false. If false, correct the statement.

1. The region covered by the boundary of a plane figure is called its volume.[False -Correction: The region covered by the boundary of a plane figure is called its area, not volume.]
2. Volume of liquids can be found using measuring containers.[True]
3. Water is denser than kerosene.{true]
4. A ball of iron floats in mercury.[False – A ball of iron sinks in mercury]
5. A substance which contains less number of molecules per unit volume is said to be denser.[False. Correction: A substance which contains more number of molecules per unit volume is said to be denser.]

[V] Arrange the following in correct sequence.

1. 1L, 100 cc, 10 L, 10 cc

10 cc, 100 cc, 1L, 10 L

1. Copper, Aluminium, Gold, Iron

Aluminium, Copper, Iron, Gold

[VI] Use the analogy to fill in the blank

1. Area : m2 :: Volume : _________[m^3]
2. Liquid : Litre :: Solid : _________[Cubic meter (m^3)]
3. Water : Kerosene :: _______ : Aluminium [copper]

[VII] Consider the following statements and choose the correct option.

1. Assertion: Volume of a stone is found using a measuring cylinder. –Reason: Stone is an irregularly shaped object.

False. The assertion is incorrect because while stones are irregularly shaped, their volume is typically measured using displacement method rather than a measuring cylinder.

1. Assertion: Wood floats in water. –Reason: Water is a transparent liquid.

False. The assertion is incorrect. Wood floats in water not because water is transparent, but because wood is less dense than water, allowing it to float.

1. Assertion: Iron ball sinks in water. Reason: Water is denser than iron.
1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Assertion is false but reason is true.

Both assertion and reason are true, but reason is not the correct explanation of assertion.

While it’s true that an iron ball sinks in water and water is denser than iron, the reason provided is not the correct explanation. The sinking of the iron ball is due to its higher density compared to water, which causes it to displace water and sink.

Name some of the derived quantities.

Some derived quantities include area, volume, density, speed, and acceleration.

Give the value of one light year.

One light year is approximately equal to 9.46 trillion kilometers, representing the distance light travels in vacuum over the span of one year.

Write down the formula used to find the volume of a cylinder.

The formula to find the volume of a cylinder is V = πr^2h, where V represents volume, r is the radius, and h is the height of the cylinder.

Give the formula to find the density of objects.

The formula to find the density of objects is Density (D) = Mass (M) / Volume (V).

Name the liquid in which iron ball sinks.

The liquid in which an iron ball sinks is water, due to water’s higher density compared to iron.

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