Class 9 Physics Chapter 1
Updated: 04 Dec 2024
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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
Show Answer
(a) Physics
Explanation:
Definition of Physics:
Physics is a subject that deals with the study of physical properties of matter, energy, and their interactions.
It’s amazing how the laws of physics govern everything around us, from the smallest particles to the largest objects in the universe.
(2). Which of the following is the language of Physics?
(a) English
(b) Mathematics
(c) Latin
(d) Urdu
Show Answer
(b) Mathematics
Explanation: Mathematics is considered the language of physics because it provides the tools and language necessary to formulate physical laws and describe natural phenomena.
(3). Physics is a part of which broader field of study?
(a) Mathematics
(b) Biology
(c) Science
(d) Geography
Show Answer
(c) Science
Explanation: Physics is a part of the broader field of science, which includes various branches such as physics, chemistry, biology, and more.
Muslim Scientists
(4). Who is considered one of the early Muslim physicists?(a) Isaac Newton
(b) Yaqub Kindi
(c) Galileo Galilei
(d) Albert Einstein
Show Answer
(b) Yaqub Kindi
Explanation: Yaqub Kindi is considered one of the early Muslim physicists who made contributions to the field of physics.
(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
(a) Ibn Al-Haytham
Explanation: Ibn Al-Haytham, also known as Alhazen, is often referred to as the “Father of optics” for his significant contributions to the understanding of light and optics.
(6). Who wrote the book *Kitab al-Manazir*?
(a) Ibn Al-Haytham
(b) Al-Beruni
(c) Muhammad Abdul Salam
(d) Abdul Qadeer Khan
Show Answer
(a) Ibn Al-Haytham
Explanation: Ibn Al-Haytham wrote the book *Kitab al-Manazir*, which is known for its contributions to optics.
(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
(b) Physics
Explanation: Muhammad Abdul Salam was awarded the Nobel Prize in Physics for his contributions to electroweak unification, which is a fundamental theory in particle 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
(b) Mechanics
Explanation: Mechanics is the branch of physics that deals with the study of motion and forces.
(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
(c) Heat and Thermodynamics
Explanation: Heat and Thermodynamics is the branch of physics that studies the behavior of heat and its conversion to other forms of energy.
(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
(c) Waves and Oscillation
Explanation: The study of waves and oscillations is a part of the branch of physics known as 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
(a) Optics
Explanation: Optics is the branch of physics that deals with the study of light and its properties.
(12). Which branch of physics focuses on electrical and magnetic phenomena?
(a) Optics
(b) Mechanics
(c) Electricity and Magnetism
(d) Relativity
Show Answer
(c) Electricity and Magnetism
Explanation: Electricity and Magnetism is the branch of physics that focuses on electrical and magnetic phenomena.
(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
(b) Atomic and Nuclear Physics
Explanation: The study of the structure and behavior of atomic nuclei is part of Atomic and Nuclear Physics.
(14). What branch of physics studies the relationship between space, time, and gravity?
(a) Quantum Physics
(b) Atomic and Nuclear Physics
(c) Electricity and Magnetism
(d) Relativity
Show Answer
(d) Relativity
Explanation: Relativity is the branch of physics that studies the relationship between space, time, and gravity.
(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
(a) Particle Physics
Explanation: Particle Physics deals with the study of subatomic particles and their interactions.
(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
(b) Cosmology and Astrophysics
Explanation: Cosmology and Astrophysics is the branch of physics that studies the universe as a whole, its origins, and its evolution.
(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
(a) Biophysics and Medical Physics
Explanation: Biophysics and Medical Physics apply principles of physics to living systems and medical technologies.
(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
(a) Quantum Physics
Explanation: Quantum Physics is the branch of physics that studies matter and energy on the smallest scales, such as atoms and subatomic particles.
Physical Quantities
(19). The international system of units is abbreviated as:(a) IS
(b) SI
(c) ISU
(d) None of these
Show Answer
(b) SI
Explanation: The International System of Units is abbreviated as SI, which stands for “Système International d’Unités.”
(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
(d) Speed
Explanation: Speed is a derived quantity, not a base quantity, as it is defined as the ratio of distance to time.
(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
(b) 7
Explanation: There are 7 base physical quantities in the SI system: length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
(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
(d) Multiples
Explanation: There are multiples of derived physical quantities in the SI system, derived from combinations of the base quantities.
(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
(b) Quantities obtained from multiplication and division of base quantities
Explanation: Derived quantities are obtained by combining or manipulating the base quantities through mathematical operations like multiplication and division.
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
(a) Meter
Explanation: The fundamental unit in the SI system for length is the meter.
(25). What are the fundamental units in the SI system for time?
(a) Meter
(b) Kilogram
(c) Second
(d) Ampere
Show Answer
(c) Second
Explanation: The fundamental unit in the SI system for time is the second.
(26). What are the fundamental units in the SI system for mass?
(a) Meter
(b) Kilogram
(c) Second
(d) Ampere
Show Answer
(b) Kilogram
Explanation: The fundamental unit in the SI system for mass is the kilogram.
(27). What are the fundamental units in the SI system for electric current?
(a) Meter
(b) Kilogram
(c) Second
(d) Ampere
Show Answer
(d) Ampere
Explanation: The fundamental unit in the SI system for electric current is the ampere.
(28). What are the fundamental units in the SI system for temperature?
(a) Meter
(b) Kelvin
(c) Second
(d) Ampere
Show Answer
(b) Kelvin
Explanation: The fundamental unit in the SI system for temperature is the kelvin.
(29). What are the fundamental units in the SI system for the amount of substance?
(a) Mole
(b) Kilogram
(c) Second
(d) Ampere
Show Answer
(a) Mole
Explanation: The fundamental unit in the SI system for the amount of substance is the mole.
(30). What are the fundamental units in the SI system for luminous intensity?
(a) Meter
(b) Kilogram
(c) Candela
(d) Ampere
Show Answer
(c) Candela
Explanation: The fundamental unit in the SI system for luminous intensity is the candela.
(31). Which of the following is a derived unit in the SI system?
(a) Kilogram
(b) Second
(c) Newton
(d) Ampere
Show Answer
(c) Newton
Explanation: The Newton is a derived unit in the SI system, representing force.
The equation is F = ma.
Scientific Notation
(32). Expressing a number in the form of a \times 10^n is known as:(a) Exponential form
(b) Fractional form
(c) Scientific notation
(d) Decimal notation
Show Answer
(c) Scientific notation
Explanation: Expressing a number as a \times 10^n is known as scientific notation,
where “a” is a coefficient, and “n” is an exponent.
(33). How many seconds are in one hour?
(a) 36 seconds
(b) 3600 seconds
(c) 7200 seconds
(d) 600 seconds
Show Answer
(b) 3600 seconds
Explanation: There are 60 seconds in a minute and 60 minutes in an hour,
so the total seconds in an hour is 60 \times 60 = 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
(a) 1000
Explanation: The prefix “kilo-” represents a multiplication factor of 1000.
For example, 1 kilometer is equal to 1000 meters.
(35). One Femto is equal to:
(a) 10^{15}
(b) 10^{-15}
(c) 10^{12}
(d) 10^{-12}
Show Answer
(b) 10^{-15}
Explanation: One femto (f) is equal to 10^{-15} in the International System of Units (SI).
(36). One Atto is equal to:
(a) 10^{15}
(b) 10^{-15}
(c) 10^{-18}
(d) 10^{-12}
Show Answer
(c) 10^{-18}
Explanation: One Atto (a) is equal to 10^{-18} in the International System of Units (SI).
(37). The symbol used for micro is:
(a) m
(b) µ
(c) M
(d) None of these
Show Answer
(b) µ
Explanation: The symbol used for micro is the Greek letter mu (µ).
It represents 10^{-6}.
(38). One Nano is equal to:
(a) 10^{15}
(b) 10^{-9}
(c) 10^{12}
(d) 10^{-12}
Show Answer
(b) 10^{-9}
Explanation: One nano (n) is equal to 10^{-9} in the International System of Units (SI).
(39). Which of the following prefixes represents a greater value in the SI system?
(a) Milli
(b) Kilo
(c) Centi
(d) Micro
Show Answer
(b) Kilo
Explanation: Among the given prefixes, “kilo” represents a greater value,
i.e., “kilo” represents 10^3, which is larger compared to the other prefixes.
(40). Among the prefixes given below, which one denotes a smaller value?
(a) Giga
(b) Deca
(c) Tera
(d) Milli
Show Answer
(d) Milli
Explanation: Among the given prefixes, “milli” denotes a smaller value,
i.e., “milli” represents 10^{-3}, which is smaller compared to the other options.
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
(a) Least count
Explanation: The smallest value that can be measured by an instrument is known as the “least count” of the instrument.
Meter Rule
(42). What is the least count of a standard meter rule?(a) 0.1mm
(b) 1mm
(c) 100mm
(d) 1000mm
Show Answer
(b) 1mm
Explanation: The least count of a standard meter rule is the smallest measurement that can be made with the instrument. For a meter rule with millimeter divisions, the least count is 1mm.
(43). How many meters are in 1 kilometer?
(a) 100 m
(b) 1000 m
(c) 10 m
(d) 10000 m
Show Answer
(b) 1000 m
Explanation: There are 1000 meters in 1 kilometer.
The prefix “kilo-” represents a factor of 1000.
(44). How many millimeters are in 1 meter?
(a) 100 mm
(b) 1000 mm
(c) 10000 mm
(d) 10 mm
Show Answer
(b) 1000 mm
Explanation: There are 1000 millimeters in 1 meter.
The prefix “milli-” represents a factor of 0.001.
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
(a) Vernier caliper
Explanation: Vernier caliper is used for measuring dimensions such as length, diameter, and thickness of objects with high precision.
(46). What is the main purpose of Vernier caliper?
(a) Measuring weight
(b) Measuring temperature
(c) Measuring length
(d) Measuring current
Show Answer
(c) Measuring length
Explanation: The main purpose of a Vernier caliper is to measure the length of objects with high accuracy.
(47). Which part of the Vernier caliper is used for making outside measurements?
(a) Upper jaws
(b) Lower jaws
(c) Depth probe
(d) Main scale
Show Answer
(b) Lower jaws
Explanation: The lower jaws of the Vernier caliper are used for making outside measurements.
(48). The least count of Vernier caliper is also known as:
(a) Pitch
(b) Vernier constant
(c) Error
(d) None of these
Show Answer
(b) Vernier constant
Explanation: The least count of Vernier caliper is also known as the Vernier constant and represents the smallest measurement that can be made.
(49). Total length of Vernier scale is:
(a) 1 mm
(b) 5 mm
(c) 9 mm
(d) 10 mm
Show Answer
(c) 9 mm
Explanation: The total length of the Vernier scale is typically 9 mm.
(50). Number of divisions on the Vernier scale are:
(a) 5
(b) 10
(c) 15
(d) 20
Show Answer
(b) 10
Explanation: The Vernier scale typically has 10 divisions.
(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
(a) 1 mm
Explanation: The smallest division on the main scale of the Vernier caliper is typically 1 mm.
(52). If zero of the Vernier Scale is on the right side of the zero of the main scale, then the error is known as ………. Zero error:
(a) Positive
(b) Negative
(c) No error
(d) All of these
Show Answer
(a) Positive
Explanation: If the zero of the Vernier scale is to the right of the zero of the main scale, it is called a positive zero error.
(53). If zero of the Vernier Scale is on the left side of the zero of the main scale, then the error is known as ………. Zero error:
(a) Positive
(b) Negative
(c) No error
(d) All of these
Show Answer
(b) Negative
Explanation: If the zero of the Vernier scale is to the left of the zero of the main scale, it is called a negative zero error.
(54). Positive error of Vernier Caliper is to be:
(a) Added
(b) Subtracted
(c) Multiplied
(d) Divided
Show Answer
(b) Subtracted
Explanation: Positive error is subtracted from the observed measurement.
(55). Negative error of Vernier Caliper is to be:
(a) Added
(b) Subtracted
(c) Multiplied
(d) Divided
Show Answer
(a) Added
Explanation: Negative error is added to the observed measurement.
(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
(a) 0.1 mm
Explanation:
The least count is calculated as the difference between one main scale division and one Vernier scale division:
\text{Least Count} = \frac{\text{Value of one main scale division}}{\text{Number of divisions on the Vernier scale}}
\text{Least Count} = \frac{1 \, \text{mm}}{10} = 0.1 \, \text{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
(b) 0.01 mm
Explanation: The least count of a screw gauge is typically 0.01 mm, representing the smallest measurement that can be made.
(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
(c) Measuring length and diameter
Explanation: The primary use of a screw gauge is to measure the dimensions of objects, including length and diameter, with high precision.
(59). Total number of divisions on the circular scale of Screw Gauge are:
(a) 20
(b) 30
(c) 50
(d) 70
Show Answer
(c) 50
Explanation: The circular scale of a screw gauge typically has 50 divisions.
(60). Pitch of Screw Gauge is:
(a) 0.5 mm
(b) 5 mm
(c) 25 mm
(d) 50 mm
Show Answer
(a) 0.5 mm
Explanation: The pitch of a screw gauge is the distance moved by the spindle in one complete rotation, which is typically 0.5 mm.
(61). If zero of the 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
(b) Negative
Explanation: If the zero of the circular scale is above the horizontal line, it is considered a negative zero error.
(62). If zero of the 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
(a) Positive
Explanation: If the zero of the circular scale is below the horizontal line, it is considered a positive zero error.
(63). Positive error of the Screw Gauge is to be:
(a) Added
(b) Subtracted
(c) Multiplied
(d) Divided
Show Answer
(b) Subtracted
Explanation: Positive error is subtracted from the observed measurement.
(64). Negative error of the Screw Gauge is to be:
(a) Added
(b) Subtracted
(c) Multiplied
(d) Divided
Show Answer
(a) Added
Explanation: Negative error is added to the observed measurement.
(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
(b) Pitch
Explanation: The pitch of a screw gauge is the distance covered by the circular scale on the main scale in one complete rotation.
(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 an object
(c) Spindle is not rotating smoothly
(d) None of these
Show Answer
(b) Reading is not zero when jaws are closed without an object
Explanation: Zero error in a screw gauge occurs when the reading is not zero when the jaws are closed without any object.
Physical Balance
(67). The physical balance is used to measure:(a) Length
(b) Volume
(c) Mass
(d) Time
Show Answer
(c) Mass
Explanation: A physical balance is used to measure the mass of an object.
Stop Watch
(68). What instrument is used to measure the time duration of an event?(a) Stopwatch
(b) Measuring cylinder
(c) Physical balance
(d) Meter rule
Show Answer
(a) Stopwatch
Explanation: A stopwatch is used to measure the time duration of an event with high precision.
(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
(b) Analogue or Mechanical stopwatch
Explanation: An analogue or mechanical stopwatch has hands that move to indicate the seconds and minutes.
(70). What is the least count of an analogue or mechanical stopwatch?
(a) 1 second
(b) 0.1 second
(c) 0.01 second
(d) 0.001 second
Show Answer
(b) 0.1 second
Explanation: The least count of an analogue or mechanical stopwatch is typically 0.1 second.
(71). What is the least count of a digital stopwatch?
(a) 1 second
(b) 0.1 second
(c) 0.01 second
(d) 0.001 second
Show Answer
(c) 0.01 second
Explanation: The least count of a digital stopwatch is typically 0.01 second.
Measuring Cylinder
(72). The measuring cylinder is used to measure:(a) Length
(b) Volume
(c) Mass
(d) Time
Show Answer
(b) Volume
Explanation: A measuring cylinder is used to measure the volume of liquids.
(73). The SI unit of volume is:
(a) cm^3
(b) mm^3
(c) m^3
(d) None of these
Show Answer
(c) m^3
Explanation: The SI unit of volume is cubic meters 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
(c) 1000 L
Explanation: There are 1000 liters in 1 cubic meter.
(75). How many mL are in 1 cm^3?
(a) 1 mL
(b) 10 mL
(c) 100 mL
(d) 1000 mL
Show Answer
(a) 1 mL
Explanation: There is 1 milliliter in 1 cubic centimeter (cm^3).
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 \ m^3
Show Answer
(c) 15.6 \ cm^3
Explanation:
Volume = (2.5 \, \text{cm})^3
V = 2.5 \, \text{cm} \times 2.5 \, \text{cm} \times 2.5 \, \text{cm}
V = 15.625 \, \text{cm}^3
Rounded to the appropriate number of significant figures, it becomes 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
(d) Significant figures
Explanation: Significant figures include all accurately known figures and the first doubtful figure in a measurement.
(78). The zeros in between the digits are considered:
(a) Significant
(b) Not significant
(c) Constant
(d) All of these
Show Answer
(a) Significant
Explanation: Zeros between nonzero digits are considered significant. For example, in 105, there are three significant figures.
(79). The number of significant figures in the value 0.0025 is:
(a) 5
(b) 4
(c) 3
(d) 2
Show Answer
(d) 2
Explanation: In 0.0025, the zeros after the decimal point are not significant.
Therefore, there are two significant figures. Zeros only serve as placeholders for the decimal point.
(80). The number of significant figures in the value 0.40005 is:
(a) 5
(b) 4
(c) 3
(d) 2
Show Answer
(a) 5
Explanation: In 0.40005, all digits are considered significant, so there are five significant figures.
1. The nonzero digits (4, 5) are always significant.
2. Any zeros between nonzero digits are also significant.
3. Leading zeros (zeros to the left of the first nonzero digit) are not considered significant.
4. Trailing zeros in a decimal number are considered significant.
(a) 5
(b) 4
(c) 3
(d) 2
Show Answer
(b) 4
Explanation:
In the number 5.023 \times 10^3, there are four significant figures: 5, 0, 2, and 3.
The exponent 10^3 does not affect the count of significant figures; it simply indicates the power of 10 by which the number is multiplied.
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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