Home | | Science 9th std | One Mark Questions Answers

## Chapter: 9th Science : Physics : Measurement

Science : Physics : Measurement : Book Back Important Questions, Answers, Solutions : I. Choose the correct answer, II. Fill in the blanks, III. State whether true or false. If false, correct the statement, IV. Match the following, V. Assertion and reason type questions

PHYSICS

MEASUREMENT

TEXT BOOK EXERCISES

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

[Answer: (a) mm < cm < m < 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 length .

2. 1 kg of rice is weighed by beam balance.

3. Thickness of a cricket ball is measured by vernier caliper.

4. Radius of a thin wire is measured by screw gauge.

5. A physical balance measures small differences in mass up to 1 mg or less.

III. State whether true or false. If false, correct the statement :

1. The SI unit of electric current is kilogram.

Correct statement: The SI unit of electric current is ampere.

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 caliper we can have an accuracy of 0.1 mm and with screw gauge we can have an accuracy of 0.01 mm.

IV. Match the following :

1.

Length - kelvin

Mass - metre

Time - kilogram

Temperature - second

Length - metre

Mass - kilogram

Time - second

Temperature - kelvin

2.

Screw gauge - Vegetables

Vernier caliper - Coins

Beam balance - Gold ornaments

Digital balance - Cricket ball

Screw gauge - Coins

Vernier caliper - Cricket ball

Beam balance - Vegetables

Digital balance - Gold ornaments

V. Assertion and reason type questions :

Mark the correct answer as :

(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

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

[Answer: (a) Both A and R are true but R is not the correct reason.]

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

[Answer: (b) Both A and R are true and R is the correct reason.]

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: (d) A is false but R is true]

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

Tags : Measurement | Physics | Science , 9th Science : Physics : Measurement
Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
9th Science : Physics : Measurement : One Mark Questions Answers | Measurement | Physics | Science