Measurements and Experimentation Exe-1A MCQs Concise Physics Solutions ICSE Class-9 Selina Publishers Ch-1 There is the solutions of short Answer type Questions of your latest textbook which is applicable in 2025-26 academic session. Visit official Website CISCE for detail information about ICSE Board Class-9.

Measurements and Experimentation Exe-1A MCQs Concise Physics Solutions ICSE Class-9 Selina Publishers Ch-1

Board	ICSE
Class	9
Subject	Physics
Writer / Publication	Concise selina Publishers
Chapter-1	Measurements and Experimentation
Exe – 1A	System of Unit
Topics	Solution of Exe-1(A) MCQs Type
Academic Session	2025-2026

A system of units are the complete set of units, both fundamental and derived, for all kinds of physical quantities.  In the system of units, the first three systems of units (CGS, SI, MKS systems) are the metric systems of units. FPS is not a metric system of units: it is a British system of units.

System of Unit

Measurements and Experimentation Exe-1A MCQs Concise Physics Solutions ICSE Class-9 Selina Publishers. Ch-1

Page 9

Que-1: The condition(s) essential for a unit to be accepted internationally :

(a) The unit should be of convenient size and without any ambiguity.
(b) The unit should be reproducible.
(c) The value of the unit should not change with space and time.
(d) All of the above.

Ans: (d) All of the above

Que-2: In mechanics, the three fundamental quantities are:

(a) Length, mass, velocity
(b) Mass, time, density
(c) Mass, time, pressure
(d) Length, mass, time

Ans: (d) Length, mass, time

Hint- In mechanics, length, mass and time are the three fundamental units. Unit of length is metre (m), unit of mass is kilogram (kg), unit of time is second (s).

Que-3: How many units are fundamental and complementary?

(a) 2 fundamental, 7 complementary
(b) 3 fundamental, 6 complementary
(c) 7 fundamental, 2 complementary
(d) 4 fundamental, 5 complementary

Ans: (c) 7 fundamental, 2 complementary

Hint- Fundamental and complementary units are as follows:

Fundamental Units	Unit	Symbol
Length	metre	m
Mass	kilogram	kg
Time	second	s
Temperature	kelvin	K
Luminous intensity	candela	cd
Electric current	ampere	A
Amount of substance	mole	mol

 

Complementary Units	Unit	Symbol
Angle	radian	rd
Solid angle	steradian	st-rd

 

Que-4: The fundamental unit is —

(a) newton
(b) pascal
(c) hertz
(d) second

Ans: (d) second

Hint- Out of the given units, only ‘second’ is a fundamental unit.

Que-5: Which of the following unit is not a fundamental unit:

(a) Metre
(b) Litre
(c) Second
(d) Kilogram

Ans: (b) Litre

Hint- Metre, second and kilogram are the fundamental units whereas litre is a derived unit.

Que-6: One millimeter is …………… part of a metre:

(a) One hundredth
(b) One thousandth
(c) One billionth
(d) One millionth

Ans: (b) One thousandth

Hint- One millimeter is one thousandth part of a metre.

1 mm = 1/1000 m = 10^-3 m = 1/10 cm

Que-7: One astronomical unit is equal to:

(a) 1.496 x 10¹¹ metre
(b) 1.596 x 10¹² metre
(c) 1.498 x 10¹⁰ metre
(d) 1.398 x 10¹¹ metre

Ans: (a) 1.496 x 10¹¹ metre

Hint- One astronomical unit is equal to the mean distance between the earth and the sun. i.e.,

1 A.U. = 1.496 x 10¹¹ metre

Que-8: The distance of stars from earth is generally measured in:

(a) Kilometre
(b) Light year
(c) Angstrom
(d) Fermi

Ans: (b) Light year

Hint- A light year is the distance travelled by light in vacuum, in one year.

Que-9: 1 Fermi is equal to:

(a) 10^-14 m
(b) 10^-10 m
(c) 10¹⁵ m
(d) 10^-15 m

Ans: (d) 10^-15 m

Hint- Fermi is 10^-15th part of a metre. i.e., 1 fermi = 10^-15 m

Que-10: The unit of time is:

(a) light year
(b) parsec
(c) leap year
(d) angstrom

Ans: (c) leap year

Hint- Leap year is the unit of time. Light year, parsec, angstrom are unit of distance. A leap year is the year in which the month of February is of 29 days.

Que-11: 1 Å is equal to:

(a) 0.1 nm
(b) 10^-10cm
(c) 10^-8m
(d) 10⁴µ

Ans: (a) 0.1 nm

Hint- 10 Å = 1nm
∴ 1 Å = 0.1nm

Que-12: One metric tonne is equal to :

(a) 10 quintal
(b) 100 quintal
(c) 1000 quintal
(d) 25 quintal

Ans: (a) 10 quintal

Hint- It is one thousand times a kilogram. i.e., 1 metric tonne = 1000 kg = 10 quintal.

Que-13: Light-year is the unit of:

(a) Time
(b) Length
(c) Mass
(d) none of these

Ans: (b) Length

Hint- A Light-year is the distance travelled by light in vacuum, in one year.

Que-14: One solar mass is equal to :

(a) 3 x 10²⁰ kg
(b) 2 x 10²⁷ kg
(c) 2 x 10³⁰kg
(d) 3 x 10³⁰ kg

Ans: (c) 2 x 10³⁰kg

Hint- The mass of large heavenly bodies is measured in terms of solar mass where 1 solar mass is the mass of the sun i.e., 1 solar mass = 2 x 10³⁰ kg

Que-15: One lunar cycle is nearly equal to:

(a) 28.5 days
(b) 29.5 days
(c) 30 days
(d) 30.5 days

Ans: (b) 29.5 days

Hint- One lunar cycle is the amount of time it takes for the Moon to complete one orbit around the Earth and it is nearly equal to 29.5 days.

Que-16: One shake is equal to:

(a) 10^-9s
(b) 10^-8 s
(c) 10^-10 s
(d) 10⁸ s

Ans: (b) 10^-8 s

Hint- Shake is a smaller unit of time where, 1 shake = 10-8 s and 1 nano shake = 10-9 s

Que-17: Which of the following unit is equivalent to watt?

(a) Volt x Ampere
(b) Volt/Ampere
(c) Ampere/Volt
(d) Ohm

Ans: (a) Volt x Ampere

Hint- watt is the unit of electrical power and is defined as potential x current = volt x ampere.

Que-18: Which one of the following is a derived unit?

(a) Metre
(b) Kelvin
(c) Metre³
(d) Mole

Ans: (b) Metre³

Hint- Volume is a derived unit. Its formula is:
Volume = length x breadth x height
= metre x metre x metre = metre³

Que-19: The S.I. unit of energy is:

(a) Joule
(b) Kg m²
(c) Kg m²s^-3
(d) Kg m²s^-1

Ans: (a) Joule

Hint- Work done or energy = force x displacement = kgm²s^-2 or J

Que-20: The S.I. unit of pressure is:

(a) Kg m^-2s^-2
(b) Kg m^-1s^-2
(c) Kg ms²
(d) Kg ms^-2

Ans: (b) Kg m^-1s^-2

Hint- Pressure = force/area = Kg m^-1s^-2

Que-21: Which of the following is the smallest unit?

(a) Millimetre
(b) Angstrom
(c) Fermi
(d) Metre

Ans: (c) Fermi

Hint- Fermi is 10^-15th part of a metre. i.e., 1 fermi = 10^-15 m, hence it is the smallest unit.

Angstrom = 10^-10th part of a metre.
Millimetre = 10^-3th part of a metre.

—  : End of Measurements and Experimentation Exe-1A MCQs Concise Physics ICSE Class-9 Selina Publishers Ch-1 Solutions :–

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