# 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 (Meter Rule, Vernier Caliper, Screw Gauge, Physical Balance, Stop Watch, Measuring Cylinder) and Significant Figures.

## Class 9 Physics Chapter 1 Notes

### Physical Quantities and Measurement

Physics Class 9 Chapter 1

### Class 9 Physics Chapter 1 SLO Based Notes

Class 9 Physics SLO Based Chapter 1

## 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

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### 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