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
Class 9 Physics Chapter 1 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
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Physics
2 Which of the following is the language of Physics?
(a) English
(b) Mathematics
(c) Latin
(d) Urdu
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Mathematics
3 Physics is a part of which broader field of study?
(a) Mathematics
(b) Biology
(c) Science
(d) Geography
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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
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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
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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
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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
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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
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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
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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
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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
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Optics
12 Which branch of physics focuses on electrical and magnetic phenomena?
(a) Optics
(b) Mechanics
(c) Electricity and Magnetism
(d) Relativity
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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
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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
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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
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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
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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
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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
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Quantum Physics
Physical Quantities
19 The international system of units is abbreviated as:(a) IS
(b) SI
(c) ISU
(d) None of these
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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
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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
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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
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Meter
25 What are the fundamental units in the SI system for time?
(a) Meter
(b) Kilogram
(c) Second
(d) Ampere
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Second
26 What are the fundamental units in the SI system for mass?
(a) Meter
(b) Kilogram
(c) Second
(d) Ampere
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Kilogram
27 What are the fundamental units in the SI system for electric current?
(a) Meter
(b) Kilogram
(c) Second
(d) Ampere
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Ampere
28 What are the fundamental units in the SI system for temperature?
(a) Meter
(b) Kelvin
(c) Second
(d) Ampere
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Kelvin
29 What are the fundamental units in the SI system for amount of substance?
(a) Mole
(b) Kilogram
(c) Second
(d) Ampere
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Mole
30 What are the fundamental units in the SI system for luminous intensity?
(a) Meter
(b) Kilogram
(c) Candela
(d) Ampere
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Candela
31 Which of the following is a derived unit in the SI system?
(a) Kilogram
(b) Second
(c) Newton
(d) Ampere
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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
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Scientific notation
33 How many seconds are in one hour?
(a) 36 seconds
(b) 3600 seconds
(c) 7200 seconds
(d) 600 seconds
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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
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1000
35 One Femto is equal to
(a) 10^{15}
(b) 10^{-15}
(c) 10^{12}
(d) 10^{-12}
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10^{-15}
36 One Atto is equal to
(a) 10^{15}
(b) 10^{-15}
(c) 10^{-18}
(d) 10^{-12}
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10^{-18}
37 The symbol used for micro is
(a) m
(b) \mu
(c) M
(d) None of these
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\mu
38 One Nano is equal to
(a) 10^{15}
(b) 10^{-9}
(c) 10^{12}
(d) 10^{-12}
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10^{-9}
39 Which of the following prefixes represents a greater value in the SI system?
(a) Milli
(b) Kilo
(c) Centi
(d) Micro
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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
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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
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1 mm
43 How many meters are in 1 kilometer?
(a) 100 m
(b) 1000 m
(c) 10 m
(d) 10000 m
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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
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Vernier caliper
46 What is the main purpose of Vernier caliper?
(a) Measuring weight
(b) Measuring temperature
(c) Measuring length
(d) Measuring current
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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
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Lower jaws
48 The least count of Vernier caliper is also known as
(a) Pitch
(b) Vernier constant
(c) Error
(d) None of these
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Vernier constant
49 Total length of Vernier scale is:
(a) 1 mm
(b) 5 mm
(c) 9 mm
(d) 10 mm
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9 mm
50 Number of division on the Vernier scale are:
(a) 5
(b) 10
(c) 15
(d) 20
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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
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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
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Positive
54 Positive error of Vernier Caliper is to be:
(a) Added
(b) Subtracted
(c) Multiplied
(d) Divided
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Subtracted
55 Negative error of Vernier Caliper is to be:
(a) Added
(b) Subtracted
(c) Multiplied
(d) Divided
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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
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Subtracted
64 Negative error of the Screw Gauge is to be:
(a) Added
(b) Subtracted
(c) Multiplied
(d) Divided
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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
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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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