Measurement

Samacheer Book Back Questions And Answers For Science Standard 9 “Measurement“

I. Choose the correct answer:
1. Choose the correct one.
(a) mm < cm < m < km
(b) mm > cm > m > km
(c) km < m < cm < mm
(d) mm > m > cm > km

2. Rulers, measuring tapes and metre scales are used to measure
(a) mass
(b) weight
(c) time
(d) length

3. 1 metric ton is equal to
(a) 100 quintals
(b) 10 quintals
(c) 1/10 quintals
(d) 1/100 quintals

4. Which among the following is not a device to measure mass?
(a) Spring balance
(b) Beam balance
(c) Physical balance
(d) Digital balance

II. Fill in the blanks:
1. Metre is the unit of _____.
2. 1 kg of rice is weighed by _____.
3. Thickness of a cricket ball is measured by _____.
4. Radius of a thin wire is measured by _____.
5. A physical balance measures small differences in mass up to _____.

Answers:
1. length
2. beam balance
3. vernier calliper
4. screw gauge
5. 1 mg or less

III. State whether true or false. If false, correct the statement:
1. The SI unit of electric current is kilogram.
2. Kilometre is one of the SI units of measurement.
3. In everyday life, we use the term weight instead of mass.
4. A physical balance is more sensitive than a beam balance.
5. One Celsius degree is an interval of 1 K and zero degree Celsius is 273.15 K.
6. With the help of vernier calliper we can have an accuracy of 0.1 mm and with screw gauge we can have an accuracy of 0.01 mm.

Answers:
1. False (The SI unit of electric current is ampere)
2. True
3. True
4. True
5. True
6. True

IV (A) Match the following:
1. Length            A. kelvin
2. Mass               B. metre
3. Time               C. kilogram
4. Temperature   D. second

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

IV (B) Match the following:
1. Screw gauge        A. Vegetables
2. Vernier calliper     B. Coins
3. Beam balance       C. Gold ornaments
4. Digital balance     D. Cricket ball

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

V. Assertion and reason type questions:
1. Assertion (A): The scientifically correct expression is “The mass of the bag is 10 kg”
Reason (R): In everyday life, we use the term weight instead of mass.
(a) Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct reason.
(c) A is true but R is false.
(d) A is false but R is true

2. Assertion (A): 0°C = 273.16 K. For our convenience we take it as 273 K after rounding off the decimal.
Reason (R): To convert a temperature on the Celsius scale we have to add 273 to the given temperature.
(a) Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct reason.
(c) A is true but R is false.
(d) A is false but R is true

3. Assertion (A): Distance between two celestial bodies is measured in terms of light year.
Reason (R): The distance travelled by the light in one year is one light year.
(a) Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct reason.
(c) A is true but R is false.
(d) A is false but R is true

Answer:
Distance between two celestial bodies is measured in terms of astronomical unit.

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