# Class 9 Physics Chapter 1

Updated: 08 Oct 2023

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Class 9 Physics Chapter 1 is about “Physical Quantities and Measurement”. This article includes topics such as Introduction to Physics, Muslim Scientists, Branches of Physics, Physical Quantities, International Systems of Units (* SI Units*), Scientific Notation, Prefixes to Power of Ten, Measuring Instruments

*and Significant Figures.*

**(Meter Rule, Vernier Caliper, Screw Gauge, Physical Balance, Stop Watch, Measuring Cylinder)**## Class 9 Physics Chapter 1 Notes

### Physical Quantities and Measurement

Physics Class 9 Chapter 1

Download Chapter 1### Class 9 Physics Chapter 1 SLO Based Notes

Class 9 Physics SLO Based Chapter 1

Download SLO based Notes## Physics Class 9 Chapter 1-MCQs

### Introduction to Physics

1 The study of physical properties of matter, energy and their interactions is called ……………..(a) Physics

(b) Chemistry

(c) Biology

(d) Mathematics

## Show Answer

**
Physics
**

2 Which of the following is the language of Physics?

(a) English

(b) Mathematics

(c) Latin

(d) Urdu

## Show Answer

**
Mathematics
**

3 Physics is a part of which broader field of study?

(a) Mathematics

(b) Biology

(c) Science

(d) Geography

## Show Answer

**
Science
**

### Muslim Scientists

4 Who is considered one of the early Muslim physicists?(a) Issac Newton

(b) Yaqub Kindi

(c) Galileo Galilei

(d) Albert Einstein

## Show Answer

**
YaqubKindi
**

5 Which Muslim physicist is often referred to as the “Father of optics”?

(a) Ibn al-Haytham

(b) Al-Beruni

(c) Muhammad Abdul Salam

(d) Abdul Qadeer Khan

## Show Answer

**
Ibn al-Haytham
**

6 Who wrote the book KITAB UL MANAZIR?

(a) Ibn al-Haytham

(b) Al-Beruni

(c) Muhammad Abdul Salam

(d) Abdul Qadeer Khan

## Show Answer

**
Ibn al-Haytham
**

7 The famous Pakistani physicist, Muhammad Abdul Salam, was awarded the Nobel Prize in which field?

(a) Medicine

(b) Physics

(c) Chemistry

(d) Biology

## Show Answer

**
Physics
**

**To Download Complete Notes of Physics Notes 9 Class, Click the link.**

### Branches of Physics

8 Which branch of physics deals with the study of motion and forces?(a) Optics

(b) Mechanics

(c) Heat and Thermodynamics

(d) Relativity

## Show Answer

**
Mechanics
**

9 What branch of physics studies the behavior of heat and its conversion to other forms of energy?

(a) Optics

(b) Mechanics

(c) Heat and Thermodynamics

(d) Relativity

## Show Answer

**
Heat and Thermodynamics
**

10 The study of waves and oscillations is a part of which branch of physics?

(a) Optics

(b) Mechanics

(c) Waves and Oscillation

(d) Magnetism

## Show Answer

**
Waves and Oscillation
**

11 What branch of physics deals with the study of light and its properties?

(a) Optics

(b) Mechanics

(c) Waves and Oscillation

(d) Magnetism

## Show Answer

**
Optics
**

12 Which branch of physics focuses on electrical and magnetic phenomena?

(a) Optics

(b) Mechanics

(c) Electricity and Magnetism

(d) Relativity

## Show Answer

**
Electricity and Magnetism
**

13 The study of the structure and behavior of atomic nuclei is part of which branch of physics?

(a) Quantum Physics

(b) Atomic and Nuclear Physics

(c) Electricity and Magnetism

(d) Relativity

## Show Answer

**
Atomic and Nuclear Physics
**

14 What branch of physics studies the relationship between space, time, and gravity?

(a) Quantum Physics

(b) Atomic and Nuclear Physic

(c) Electricity and Magnetism

(d) Relativity

## Show Answer

**
Relativity
**

15 Which field of physics deals with the study of subatomic particles and their interactions?

(a) Particle physics

(b) Atomic and Nuclear Physics

(c) Electricity and Magnetism

(d) Relativity

## Show Answer

**
Particle physics
**

16 The study of the universe as a whole, its origins, and its evolution is a part of which branch of physics?

(a) Quantum Physics

(b) Cosmology and Astrophysics

(c) Electricity and Magnetism

(d) Relativity

## Show Answer

**
Cosmology and Astrophysics
**

17 What field of physics applies principles of physics to living systems and medical technologies?

(a) Biophysics and Medical Physics

(b) Cosmology and Astrophysics

(c) Electricity and Magnetism

(d) Relativity

## Show Answer

**
Biophysics and Medical Physics
**

18 The study of matter and energy on the smallest scales, such as atoms and subatomic particles is called………

(a) Quantum Physics

(b) Cosmology and Astrophysics

(c) Electricity and Magnetism

(d) Relativity

## Show Answer

**
Quantum Physics
**

### Physical Quantities

19 The international system of units is abbreviated as:(a) IS

(b) SI

(c) ISU

(d) None of these

## Show Answer

**
SI
**

20 Which of the following is NOT a base quantity in the International System of Units (SI)?

(a) Time

(b) Mass

(c) Length

(d) Speed

## Show Answer

**
Speed
**

21 How many base physical quantities are there in the International System of Units (SI)?

(a) 5

(b) 7

(c) 9

(d) 12

## Show Answer

**
7
**

22 How many derived physical quantities are there in the International System of Units (SI)?

(a) 5

(b) 7

(c) 9

(d) Multiples

## Show Answer

**
Multiples
**

23 What are derived quantities in the International System of Units (SI)?

(a) Quantities that cannot be measured directly

(b) Quantities obtained from multiplication and division of base quantities

(c) Quantities obtained through complex calculations

(d) Quantities derived from non-SI units

## Show Answer

**
Quantities obtained from multiplication and division of base quantities
**

### International Systems of Units

24 What are the fundamental units in the SI system for length?(a) Meter

(b) Kilogram

(c) Second

(d) Ampere

## Show Answer

**
Meter
**

25 What are the fundamental units in the SI system for time?

(a) Meter

(b) Kilogram

(c) Second

(d) Ampere

## Show Answer

**
Second
**

26 What are the fundamental units in the SI system for mass?

(a) Meter

(b) Kilogram

(c) Second

(d) Ampere

## Show Answer

**
Kilogram
**

27 What are the fundamental units in the SI system for electric current?

(a) Meter

(b) Kilogram

(c) Second

(d) Ampere

## Show Answer

**
Ampere
**

28 What are the fundamental units in the SI system for temperature?

(a) Meter

(b) Kelvin

(c) Second

(d) Ampere

## Show Answer

**
Kelvin
**

29 What are the fundamental units in the SI system for amount of substance?

(a) Mole

(b) Kilogram

(c) Second

(d) Ampere

## Show Answer

**
Mole
**

30 What are the fundamental units in the SI system for luminous intensity?

(a) Meter

(b) Kilogram

(c) Candela

(d) Ampere

## Show Answer

**
Candela
**

31 Which of the following is a derived unit in the SI system?

(a) Kilogram

(b) Second

(c) Newton

(d) Ampere

## Show Answer

**
Newton
**

### Scientific Notation

32 Expressing a number in the form of a × 10^n is known as:(a) Exponential form

(b) Fractional form

(c) Scientific notation

(d) Decimal notation

## Show Answer

**
Scientific notation
**

33 How many seconds are in one hour?

(a) 36 seconds

(b) 3600 seconds

(c) 7200 seconds

(d) 600 seconds

## Show Answer

**
3600 seconds
**

### Prefixes to Power of Ten

34 The prefix “kilo-” represents a multiplication factor of:(a) 1000

(b) 100

(c) 10

(d) 0.1

## Show Answer

**
1000
**

35 One Femto is equal to

(a) 10^{15}

(b) 10^{-15}

(c) 10^{12}

(d) 10^{-12}

## Show Answer

**
10^{-15}
**

36 One Atto is equal to

(a) 10^{15}

(b) 10^{-15}

(c) 10^{-18}

(d) 10^{-12}

## Show Answer

**
10^{-18}
**

37 The symbol used for micro is

(a) m

(b) \mu

(c) M

(d) None of these

## Show Answer

**
\mu
**

38 One Nano is equal to

(a) 10^{15}

(b) 10^{-9}

(c) 10^{12}

(d) 10^{-12}

## Show Answer

**
10^{-9}
**

39 Which of the following prefixes represents a greater value in the SI system?

(a) Milli

(b) Kilo

(c) Centi

(d) Micro

## Show Answer

**
Kilo
**

40 Among the prefixes given below, which one denotes a smaller value?

(a) Giga

(b) Deca

(c) Tera

(d) Milli

## Show Answer

**
Milli
**

### Measuring Instruments

41 The smallest value that can be measured by an instrument is(a) Least count

(b) Pitch

(c) Error

(d) None of these

## Show Answer

**
Least count
**

#### Meter Rule

42 What is the least count of a standard meter rule?(a) 0.1 mm

(b) 1 mm

(c) 100 mm

(d) 1000 mm

## Show Answer

**
1 mm
**

43 How many meters are in 1 kilometer?

(a) 100 m

(b) 1000 m

(c) 10 m

(d) 10000 m

## Show Answer

**
1000 m
**

44 How many millimeters are in 1 meter?

(a) 100 mm

(b) 1000 mm

(c) 10000 mm

(d) 10 mm

## Show Answer

**
1000 mm
**

#### Vernier Caliper

45 Which instrument is used to measure the diameter of a small spherical object?(a) Vernier caliper

(b) Stop watch

(c) Physical balance

(d) Measuring cylinder

## Show Answer

**
Vernier caliper
**

46 What is the main purpose of Vernier caliper?

(a) Measuring weight

(b) Measuring temperature

(c) Measuring length

(d) Measuring current

## Show Answer

**
Measuring length
**

47 Which part of the Vernier caliper is used for making outside measurement?

(a) Upper jaws

(b) Lower jaws

(c) Depth probe

(d) Main scale

## Show Answer

**
Lower jaws
**

48 The least count of Vernier caliper is also known as

(a) Pitch

(b) Vernier constant

(c) Error

(d) None of these

## Show Answer

**
Vernier constant
**

49 Total length of Vernier scale is:

(a) 1 mm

(b) 5 mm

(c) 9 mm

(d) 10 mm

## Show Answer

**
9 mm
**

50 Number of division on the Vernier scale are:

(a) 5

(b) 10

(c) 15

(d) 20

## Show Answer

**
10
**

51 Smallest division on the main scale of Vernier Caliper is:

(a) 1 mm

(b) 5 mm

(c) 10 mm

(d) 100 mm

## Show Answer

**
1 mm
**

52 If zero of the Vernier Scales on the right side of the zero of the main scale then it is known as ………. Zero error.

(a) Positive

(b) Negative

(c) No error

(d) All of these

## Show Answer

**
Negative
**

53 If zero of the Vernier Scale is on the left side of the zero of the main scale then it is known as ………. Zero error.

(a) Positive

(b) Negative

(c) No error

(d) All of these

## Show Answer

**
Positive
**

54 Positive error of Vernier Caliper is to be:

(a) Added

(b) Subtracted

(c) Multiplied

(d) Divided

## Show Answer

**
Subtracted
**

55 Negative error of Vernier Caliper is to be:

(a) Added

(b) Subtracted

(c) Multiplied

(d) Divided

## Show Answer

**
Added
**

56 What is the least count of Vernier caliper that has 10 divisions on the Vernier scale and 1 mm on the main scale?

(a) 0.1 mm

(b) 0.01 mm

(c) 0.5 mm

(d) 0.001 mm

## Show Answer

**
0.1 mm
**

#### Screw Gauge

57 The screw gauge measures the dimensions of an object with high precision. Its least count is typically:(a) 0.1 mm

(b) 0.01 mm

(c) 0.5 mm

(d) 0.001 mm

## Show Answer

**
0.01 mm
**

58 What is the primary use of Screw Gauge?

(a) Measuring weight

(b) Measuring temperature

(c) Measuring length and diameter

(d) Measuring current

## Show Answer

**
Measuring length and diameter
**

59 Total number of divisions on the circular scale of Screw Gauge are:

(a) 20

(b) 30

(c) 50

(d) 70

## Show Answer

**
50
**

60 Pitch of Screw Gauge is:

(a) 0.5 mm

(b) 5 mm

(c) 25 mm

(d) 50 mm

## Show Answer

**
0.5 mm
**

61 If zero of circular scale is above the horizontal line then the zero error is to be:

(a) Positive

(b) Negative

(c) No error

(d) None of these

## Show Answer

**
Negative
**

62 If zero of circular scale is below the horizontal line then the zero error is to be:

(a) Positive

(b) Negative

(c) No error

(d) None of these

## Show Answer

**
Positive
**

63 Positive error of the Screw Gauge is to be:

(a) Added

(b) Subtracted

(c) Multiplied

(d) Divided

## Show Answer

**
Subtracted
**

64 Negative error of the Screw Gauge is to be:

(a) Added

(b) Subtracted

(c) Multiplied

(d) Divided

## Show Answer

**
Added
**

65 The distance covered by a circular scale on a main scale in one complete rotation is called

(a) Least count

(b) Pitch

(c) Error

(d) None of these

## Show Answer

**
Pitch
**

66 The zero error in a screw gauge occurs when the …………..

(a) Measurement is taken from the wrong end

(b) Reading is not zero when jaws are closed without object

(c) Spindle is not rotating smoothly

(d) None of these

## Show Answer

**
Reading is not zero when jaws are closed without object
**

#### Physical Balance

67 The physical balance is used to measure:(a) Length

(b) Volume

(c) Mass

(d) Time

## Show Answer

**
Mass
**

#### Stop Watch

68 What instrument is used to measure the time duration of an event?(a) Stop watch

(b) Measuring cylinder

(c) Physical balance

(d) Meter rule

## Show Answer

**
Stop watch
**

69 A stopwatch with hands to indicate the seconds and minutes is an example of:

(a) Digital stopwatch

(b) Analogue or Mechanical stopwatch

(c) Quantum stopwatch

(d) None of these

## Show Answer

**
Analogue or Mechanical stopwatch
**

70 What is the least count of analogue or mechanical stopwatch?

(a) 1 second

(b) 0.1 second

(c) 0.01 second

(d) 0.001 second

## Show Answer

**
0.1 second
**

71 What is the least count of digital stopwatch?

(a) 1 second

(b) 0.1 second

(c) 0.01 second

(d) 0.001 second

## Show Answer

**
0.01 second
**

#### Measuring Cylinder

72 The measuring cylinder is used to measure:(a) Length

(b) Volume

(c) Mass

(d) Time

## Show Answer

**
Volume
**

73 The SI unit of volume is:

(a) cm^3

(b) mm^3

(c) m^3

(d) None \ of \ these

## Show Answer

**
m^3
**

74 How many liters (L) are in 1 cubic meter (m^3) ?

(a) 10 L

(b) 100 L

(c) 1000 L

(d) 10000 L

## Show Answer

**
1000 L
**

75 How many mL are in 1 cm^3 ?

(a) 1 mL

(b) 10 mL

(c) 100 mL

(d) 1000 mL

## Show Answer

**
1mL
**

### Significant Figure

76 Calculate the volume of a cube with sides measuring 2.5 cm, rounded to the appropriate number of significant figures.(a) 15 \ cm^3

(b) 15.625 \ cm^3

(c) 15.6 \ cm^3

(d) 15.62 \ cm^3

## Show Answer

**
15.6 cm^3
**

77 The number of accurately known figures and the first doubtful figure are known as

(a) Standard notation

(b) Scientific notation

(c) Numbers

(d) Significant figures

## Show Answer

**
Significant figures
**

78 The zeros in between the digits are considered:

(a) Significant

(b) Not significant

(c) Constant

(d) All of these

## Show Answer

**
Significant
**

79 The number of significant figures in the value 0.0025 is:

(a) 5

(b) 4

(c) 3

(d) 2

## Show Answer

**
2
**

80 The number of significant figures in the value 0.40005 is:

(a) 5

(b) 4

(c) 3

(d) 2

## Show Answer

**
5
**

81 The number of significant figures in the value 5.023 \times 10^3 is:

(a) 5

(b) 4

(c) 3

(d) 2

## Show Answer

**
4
**

## Review Exercise Chapter 1

1. How many millimeters are there in 10 cm?(a) 100 mm

(b) 200 mm

(c) 50 mm

(d) 10 mm

## Show Answer

**
100 mm
**

2. Which of the following quantity can be measured using a micrometer?

(a) Current

(b) Force

(c) Length

(d) Mass

## Show Answer

**
Length
**

3. The instrument best measures the internal diameter of a pipe is

(a) Screw gauge

(b) Vernier caliper

(c) Meter rule

(d) Measuring tape

## Show Answer

**
Vernier caliper
**

4. Which prefix represents a largest value?

(a) mega

(b) giga

(c) peta

(d) exa

## Show Answer

**
exa
**

5. Which f the following is the smallest prefix?

(a) atto

(b) pico

(c) nano

(d) femto

## Show Answer

**
atto
**

6. Which of the following numbers shows one significant digit?

(a) 1.1

(b) 6.0

(c) 7.1

(d) 6 \times 10^2

## Show Answer

**
6 \times 10^2
**

7. Which of the following numbers show 4 significant digits?

(a) 9.008

(b) 4

(c) 5174.00

(d) 0.0002

## Show Answer

**
9.008
**

8. A light year is distance traveled by light in one year. It travels about 9.460 \times 10^{15} m . How many significant figures are in this number?

(a) 6

(b) 2

(c) 3

(d) 4

## Show Answer

**
4
**

9. 0.2 \ mm in units of meter is

(a) 0.0002 m

(b) 2 \times 10^{-4} m

(c) None

(d) Both \ (a) \ and \ (b)

## Show Answer

**
Both (a) & (b)
**

10. KITAB UL MANAZIR is the name of book written by

(a) Yaqub Kindi

(b) Ibnal Haitham

(c) Al Beruni

(d) None of these

## Show Answer

**
Ibnal Haitham
**

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