100 Important MCQs (Level -1) on Physical Quantities and Measurement, Physics (Unit-Wise MCQs Practice):
Whether you are preparing for board examinations, chapter tests, college assessments, or competitive entrance exams (MDCAT, ECAT, NUST, PIEAS, GIKI, UET, FAST, and other engineering or medical admission tests), this comprehensive MCQ collection is designed to help you master Physical Quantities and Measurement. The questions are arranged progressively—from basic concepts to advanced numerical problems and higher-order thinking—ensuring complete and systematic preparation for every type of examination.
This chapter-wise MCQ collection includes:
- 100 Basic MCQs (1 to 100) – Covering fundamental concepts, definitions, SI units, measuring instruments, scientific notation, and significant figures.
- 100 Advanced & Numerical MCQs (101 - 200) – Focusing on calculations, unit conversions, dimensional analysis, uncertainty, experimental errors, and practical applications.
- 50 Higher-Order Thinking Skills (HOTS) MCQs (201 - 250) – Designed to strengthen analytical reasoning, conceptual understanding, and problem-solving abilities.
- 50 Challenging MCQs Quiz with Answers (1–50) – Carefully selected conceptual, numerical, and HOTS questions to strengthen problem-solving skills and prepare for board and competitive examinations.
This MCQ collection covers:
- Fundamental and derived physical quantities
- SI units, prefixes, and standard scientific units
- Measuring instruments and their applications
- Least count, zero error, accuracy, precision, and uncertainty
- Significant figures and scientific notation
- Unit conversions and dimensional analysis
- Experimental errors and methods for improving measurements
- Density, pressure, force, work, and power calculations
- Practical laboratory measurements and instrument selection
- Real-life applications of physical quantities and measurement
Every MCQ includes the correct answer along with a clear, concept-based explanation to strengthen understanding, improve problem-solving skills, and reinforce key physics concepts.
This question bank helps students to:
- Build a strong conceptual foundation
- Master measurement techniques and SI units
- Improve numerical and analytical problem-solving skills
- Understand dimensional analysis and experimental errors
- Avoid common examination mistakes
- Increase speed, accuracy, and confidence in objective-type questions
- Prepare effectively for both board examinations and competitive entrance tests
With 250 carefully selected MCQs arranged into 100 Basic, 100 Advanced & Numerical, and 50 HOTS questions, this all-in-one MCQ bank provides complete preparation for Physical Quantities and Measurement. It is an excellent study resource for strengthening concepts, improving exam performance, and achieving success in both school and competitive physics examinations.
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Level-I – 100 Basic MCQs (MCQs 1–100)
MCQ No. 1
Physics is mainly concerned with the study of:
a. Living organisms
b. Matter and energy
c. Society and culture
d. Language
Correct Answer: b. Matter and energy
Explanation:
Physics is the branch of science that studies matter, energy, and the interactions between them.
MCQ No. 2
Which branch of physics deals with motion without considering its causes?
a. Dynamics
b. Kinematics
c. Thermodynamics
d. Optics
Correct Answer: b. Kinematics
Explanation:
Kinematics describes the motion of objects without considering the forces responsible for the motion.
MCQ No. 3
Which of the following is NOT a physical quantity?
a. Mass
b. Length
c. Beauty
d. Time
Correct Answer: c. Beauty
Explanation:
A physical quantity can be measured and expressed with a numerical value and a unit. Beauty cannot be measured scientifically.
MCQ No. 4
Which of the following is NOT a base quantity?
a. Length
b. Mass
c. Force
d. Time
Correct Answer: c. Force
Explanation:
Force is a derived quantity because it depends on mass and acceleration.
MCQ No. 5
Which of the following is a derived quantity?
a. Length
b. Time
c. Electric current
d. Pressure
Correct Answer: d. Pressure
Explanation:
Pressure is derived from force divided by area, so it is a derived physical quantity.
MCQ No. 6
Which of the following is a fundamental physical quantity?
a. Length
b. Energy
c. Force
d. Pressure
Correct Answer: a. Length
Explanation:
Length is one of the seven SI base quantities. Energy, force, and pressure are derived quantities.
MCQ No. 7
Which of the following is an SI base quantity?
a. Force
b. Energy
c. Time
d. Pressure
Correct Answer: c. Time
Explanation:
Time is one of the seven SI base quantities and its SI unit is the second (s).
MCQ No. 8
Which of the following is a base unit in SI?
a. Joule
b. Newton
c. Mole
d. Pascal
Correct Answer: c. Mole
Explanation:
The mole is the SI base unit for the amount of substance.
MCQ No. 9
Which of the following is a fundamental unit?
a. Newton
b. Watt
c. Ampere
d. Joule
Correct Answer: c. Ampere
Explanation:
Ampere is the SI base unit of electric current.
MCQ No. 10
Which of the following is NOT an SI base unit?
a. Ampere
b. Kelvin
c. Newton
d. Mole
Correct Answer: c. Newton
Explanation:
Newton is a derived SI unit of force. Ampere, Kelvin, and Mole are SI base units.
MCQ No. 11
The SI unit of luminous intensity is:
a. Lumen
b. Candela
c. Lux
d. Watt
Correct Answer: b. Candela
Explanation:
Candela (cd) is the SI base unit of luminous intensity.
MCQ No. 12
The SI unit of temperature is:
a. Celsius
b. Fahrenheit
c. Kelvin
d. Joule
Correct Answer: c. Kelvin
Explanation:
Kelvin (K) is the SI base unit of thermodynamic temperature.
MCQ No. 13
The SI unit of work is:
a. Watt
b. Newton
c. Joule
d. Pascal
Correct Answer: c. Joule
Explanation:
The joule (J) is the SI unit of both work and energy.
MCQ No. 14
The SI unit of power is:
a. Joule
b. Watt
c. Newton
d. Volt
Correct Answer: b. Watt
Explanation:
Power is the rate of doing work, and its SI unit is the watt (W).
MCQ No. 15
The SI unit of pressure is:
a. Pascal
b. Newton
c. Joule
d. Watt
Correct Answer: a. Pascal
Explanation:
Pressure is force acting per unit area. Its SI unit is the pascal (Pa).
MCQ No. 16
The SI unit of electric potential difference is:
a. Ohm
b. Volt
c. Ampere
d. Coulomb
Correct Answer: b. Volt
Explanation:
The volt (V) is the SI unit of electric potential difference.
MCQ No. 17
Which physical quantity is measured in coulomb?
a. Current
b. Voltage
c. Charge
d. Resistance
Correct Answer: c. Charge
Explanation:
The coulomb (C) is the SI unit of electric charge.
MCQ No. 18
The SI unit of resistance is:
a. Ampere
b. Volt
c. Ohm
d. Coulomb
Correct Answer: c. Ohm
Explanation:
Electrical resistance is measured in ohms (Ω).
MCQ No. 19
The SI unit of capacitance is:
a. Ohm
b. Farad
c. Tesla
d. Henry
Correct Answer: b. Farad
Explanation:
The farad (F) is the SI unit of capacitance.
MCQ No. 20
The SI unit of inductance is:
a. Farad
b. Henry
c. Tesla
d. Weber
Correct Answer: b. Henry
Explanation:
Inductance is measured in henry (H).
MCQ No. 21
The SI unit of magnetic flux is:
a. Tesla
b. Weber
c. Henry
d. Gauss
Correct Answer: b. Weber
Explanation:
The weber (Wb) is the SI unit of magnetic flux.
MCQ No. 22
The SI unit of magnetic field is:
a. Weber
b. Tesla
c. Henry
d. Gauss
Correct Answer: b. Tesla
Explanation:
The tesla (T) is the SI unit of magnetic flux density (magnetic field).
MCQ No. 23
The SI unit of frequency is:
a. Hertz
b. Joule
c. Watt
d. Newton
Correct Answer: a. Hertz
Explanation:
Frequency is the number of cycles completed per second. Its SI unit is hertz (Hz).
MCQ No. 24
The SI unit of density is:
a. kg/m
b. kg/m²
c. kg/m³
d. g/cm³
Correct Answer: c. kg/m³
Explanation:
Density is defined as mass per unit volume, so its SI unit is kilogram per cubic metre (kg/m³).
MCQ No. 25
Which of the following is a supplementary unit (as traditionally taught in many board syllabi)?
a. Meter
b. Second
c. Radian
d. Kilogram
Correct Answer: c. Radian
Explanation:
Radian is the SI unit of plane angle. Although the modern SI treats angles as dimensionless derived quantities, many board textbooks still refer to radian (and steradian) as supplementary units. For consistency with your syllabus, this terminology has been retained.
MCQ No. 26
The SI prefix deci represents:
a. 10⁻¹
b. 10⁻²
c. 10⁻³
d. 10⁻⁶
Correct Answer: a. 10⁻¹
Explanation:
The prefix deci (d) means one-tenth or .
MCQ No. 27
The SI prefix tera represents:
a. 10³
b. 10⁶
c. 10⁹
d. 10¹²
Correct Answer: d. 10¹²
Explanation:
The prefix tera (T) represents one trillion or .
MCQ No. 28
The SI prefix for 10⁶ is:
a. Kilo
b. Mega
c. Giga
d. Tera
Correct Answer: b. Mega
Explanation:
The prefix mega (M) denotes .
MCQ No. 29
The SI prefix for 10⁻³ is:
a. Milli
b. Micro
c. Nano
d. Pico
Correct Answer: a. Milli
Explanation:
The prefix milli (m) represents one-thousandth or .
MCQ No. 30
The SI prefix for 10⁻¹² is:
a. Nano
b. Pico
c. Micro
d. Femto
Correct Answer: b. Pico
Explanation:
The prefix pico (p) represents .
MCQ No. 31
The SI prefix for 10⁻¹⁵ is:
a. Pico
b. Femto
c. Nano
d. Atto
Correct Answer: b. Femto
Explanation:
The prefix femto (f) represents .
MCQ No. 32
Which of the following is the smallest SI submultiple?
a. Pico
b. Nano
c. Femto
d. Atto
Correct Answer: d. Atto
Explanation:
Among the given prefixes, atto (a) represents , the smallest value.
MCQ No. 33
Which is the correct SI notation?
a. Km
b. KM
c. km
d. kM
Correct Answer: c. km
Explanation:
The prefix kilo is written with lowercase k, while the symbol for metre is lowercase m.
MCQ No. 34
Which of the following is written correctly according to SI rules?
a. 10meter
b. 10 M
c. 10 m
d. 10m
Correct Answer: c. 10 m
Explanation:
According to SI conventions, a space is written between the numerical value and the unit symbol.
MCQ No. 35
Which of the following is written incorrectly according to SI notation?
a. 5 kg
b. 10 m
c. 20 Sec
d. 15 A
Correct Answer: c. 20 Sec
Explanation:
The SI symbol for second is s, not Sec.
MCQ No. 36
Which of the following is NOT an SI unit?
a. Newton
b. Joule
c. Dyne
d. Pascal
Correct Answer: c. Dyne
Explanation:
Dyne is the CGS unit of force, whereas Newton is the SI unit.
MCQ No. 37
Which of the following is a CGS unit of force?
a. Newton
b. Dyne
c. Joule
d. Watt
Correct Answer: b. Dyne
Explanation:
The dyne is the unit of force in the CGS system.
MCQ No. 38
Which of the following is a product of SI base units?
a. Newton
b. Kilogram
c. Second
d. Kelvin
Correct Answer: a. Newton
Explanation:
One newton is equal to kg·m·s⁻², which is expressed in SI base units.
MCQ No. 39
Which of the following is a derived SI unit?
a. Kelvin
b. Metre
c. Second
d. Volt
Correct Answer: d. Volt
Explanation:
Volt is a derived SI unit obtained from base units.
MCQ No. 40
Which of the following is NOT a derived unit?
a. Newton
b. Joule
c. Pascal
d. Second
Correct Answer: d. Second
Explanation:
Second is an SI base unit, while the others are derived units.
MCQ No. 41
Which of the following is a vector quantity?
a. Distance
b. Speed
c. Velocity
d. Energy
Correct Answer: c. Velocity
Explanation:
Velocity has both magnitude and direction, making it a vector quantity.
MCQ No. 42
Which of the following is a scalar quantity?
a. Displacement
b. Force
c. Energy
d. Acceleration
Correct Answer: c. Energy
Explanation:
Energy possesses magnitude only and has no direction.
MCQ No. 43
Which quantity has no unit?
a. Mass
b. Length
c. Strain
d. Time
Correct Answer: c. Strain
Explanation:
Strain is the ratio of two lengths. Therefore, it has neither units nor dimensions.
MCQ No. 44
Which quantity is dimensionless but has a unit?
a. Angle
b. Strain
c. Force
d. Energy
Correct Answer: a. Angle
Explanation:
Plane angle is dimensionless but is expressed in the unit radian (rad).
MCQ No. 45
Which of the following quantities is dimensionless?
a. Density
b. Velocity
c. Coefficient of friction
d. Force
Correct Answer: c. Coefficient of friction
Explanation:
The coefficient of friction is the ratio of two forces, so it has no dimensions or units.
MCQ No. 46
Which of the following is a dimensional constant?
a. Velocity of a car
b. Speed of light
c. Height of a building
d. Weight of a book
Correct Answer: b. Speed of light
Explanation:
The speed of light in vacuum is a universal physical constant with fixed value and dimensions.
MCQ No. 47
Which of the following is a dimensional variable?
a. Moment of inertia
b. π
c. Coefficient of friction
d. e
Correct Answer: a. Moment of inertia
Explanation:
Moment of inertia has dimensions and its value changes depending on the mass distribution of an object.
MCQ No. 48
Which of the following is a physical constant?
a. Length of a table
b. Mass of a book
c. Speed of light
d. Height of a student
Correct Answer: c. Speed of light
Explanation:
The speed of light in vacuum is a universal physical constant with a fixed value.
MCQ No. 49
Which of the following is a fundamental constant?
a. π
b. e
c. Speed of light
d. Length of a rod
Correct Answer: c. Speed of light
Explanation:
Unlike π and e, which are mathematical constants, the speed of light is a fundamental physical constant.
MCQ No. 50
Which of the following is used to express very large or very small numbers conveniently?
a. Prefix system
b. Dimensional analysis
c. Scientific notation
d. SI base units
Correct Answer: c. Scientific notation
Explanation:
Scientific notation expresses numbers in the form , where . It simplifies calculations involving extremely large or very small values.
MCQ No. 51
Significant figures indicate:
a. Instrument colour
b. Measurement uncertainty
c. Unit size
d. Instrument range
Correct Answer: b. Measurement uncertainty
Explanation:
Significant figures indicate the precision of a measurement and reflect the certainty of the measured value.
MCQ No. 52
How many significant figures are present in 0.00520?
a. 2
b. 3
c. 4
d. 5
Correct Answer: b. 3
Explanation:
Leading zeros are not significant, whereas the trailing zero after the decimal is significant. Therefore, the digits 5, 2, and 0 are significant.
MCQ No. 53
How many significant figures are present in 2.500?
a. 2
b. 3
c. 4
d. 5
Correct Answer: c. 4
Explanation:
Trailing zeros to the right of a decimal point are significant. Hence, 2.500 has four significant figures.
MCQ No. 54
How many significant figures are present in 0.00032?
a. 2
b. 3
c. 4
d. 5
Correct Answer: a. 2
Explanation:
Leading zeros are not significant. Only the digits 3 and 2 are significant.
MCQ No. 55
How many significant figures are present in 4.003?
a. 2
b. 3
c. 4
d. 5
Correct Answer: c. 4
Explanation:
Zeros between non-zero digits are always significant.
MCQ No. 56
How many significant figures are present in 0.00540?
a. 2
b. 3
c. 4
d. 5
Correct Answer: b. 3
Explanation:
Leading zeros are not significant, but the trailing zero after the decimal point is significant.
MCQ No. 57
Which statement about significant figures is correct?
a. All leading zeros are significant.
b. Zeros between non-zero digits are significant.
c. Trailing zeros without a decimal point are always significant.
d. All zeros are insignificant.
Correct Answer: b. Zeros between non-zero digits are significant.
Explanation:
Zeros enclosed between non-zero digits always count as significant figures.
MCQ No. 58
Which of the following is NOT a rule of significant figures?
a. All non-zero digits are significant.
b. Zeros between non-zero digits are significant.
c. Trailing zeros without a decimal point are always significant.
d. Leading zeros are not significant.
Correct Answer: c. Trailing zeros without a decimal point are always significant.
Explanation:
Trailing zeros without a decimal point are generally not considered significant unless specifically indicated.
MCQ No. 59
The number 0.004560 written in correct scientific notation is:
a. 4.56 × 10³
b. 4.560 × 10⁻³
c. 0.456 × 10⁻²
d. 45.6 × 10⁻⁴
Correct Answer: b. 4.560 × 10⁻³
Explanation:
In scientific notation, only one non-zero digit appears before the decimal point while preserving all significant figures.
MCQ No. 60
Scientific notation is mainly used to:
a. Measure temperature
b. Express very large or very small numbers
c. Measure force
d. Determine density
Correct Answer: b. Express very large or very small numbers
Explanation:
Scientific notation simplifies calculations involving extremely large or extremely small numbers.
MCQ No. 61
The smallest measurable division on an instrument scale is called:
a. Error
b. Precision
c. Least count
d. Accuracy
Correct Answer: c. Least count
Explanation:
Least count is the smallest measurement that an instrument can measure accurately.
MCQ No. 62
Accuracy refers to:
a. Repeated measurements
b. Closeness to the true value
c. Instrument range
d. Least count
Correct Answer: b. Closeness to the true value
Explanation:
Accuracy indicates how close a measured value is to the actual or accepted value.
MCQ No. 63
Precision refers to:
a. Closeness to the true value
b. Consistency of repeated measurements
c. Calibration of an instrument
d. Instrument sensitivity
Correct Answer: b. Consistency of repeated measurements
Explanation:
Precision shows how closely repeated measurements agree with each other.
MCQ No. 64
The least count mainly determines an instrument's:
a. Accuracy
b. Precision
c. Range
d. Zero error
Correct Answer: b. Precision
Explanation:
A smaller least count allows finer measurements, thereby improving precision.
MCQ No. 65
A zero error is an example of:
a. Random error
b. Systematic error
c. Human error
d. Gross error
Correct Answer: b. Systematic error
Explanation:
Zero error remains constant in repeated measurements and is therefore a systematic error.
MCQ No. 66
Which of the following is an example of a random error?
a. Faulty calibration
b. Zero error
c. Observer's reaction time
d. Incorrect scale marking
Correct Answer: c. Observer's reaction time
Explanation:
Human reaction time varies from one observation to another, producing random errors.
MCQ No. 67
Random errors can be reduced by:
a. Using defective instruments
b. Taking repeated measurements
c. Ignoring observations
d. Increasing least count
Correct Answer: b. Taking repeated measurements
Explanation:
The average of repeated observations reduces the effect of random errors.
MCQ No. 68
Systematic errors can be reduced by:
a. Taking average readings
b. Repeating measurements
c. Proper calibration of instruments
d. Guessing the reading
Correct Answer: c. Proper calibration of instruments
Explanation:
Systematic errors usually arise from faulty instruments and can be minimized through proper calibration.
MCQ No. 69
The maximum possible error in a measurement is generally equal to:
a. Least count
b. Half of the least count
c. Twice the least count
d. One-fourth of the least count
Correct Answer: b. Half of the least count
Explanation:
The maximum possible error of an instrument is approximately ±½ × least count.
MCQ No. 70
If the least count of a measuring instrument is 0.2 cm, the maximum possible error is:
a. 0.1 cm
b. 0.2 cm
c. 0.4 cm
d. 0.05 cm
Correct Answer: a. 0.1 cm
Explanation:
Maximum possible error = ½ × 0.2 cm = 0.1 cm.
MCQ No. 71
The least count of a standard micrometer screw gauge is usually:
a. 1 cm
b. 1 mm
c. 0.1 mm
d. 0.01 mm
Correct Answer: d. 0.01 mm
Explanation:
A standard micrometer screw gauge commonly has a least count of 0.01 mm.
MCQ No. 72
The least count of a vernier caliper depends upon:
a. Main scale only
b. Vernier scale only
c. Both the main scale and vernier scale
d. Zero error
Correct Answer: c. Both the main scale and vernier scale
Explanation:
Least count is determined by the value of one main scale division and the number of divisions on the vernier scale.
MCQ No. 73
The standard SI unit of length is:
a. Centimetre
b. Metre
c. Kilometre
d. Millimetre
Correct Answer: b. Metre
Explanation:
The metre (m) is the SI base unit of length.
MCQ No. 74
The standard SI unit of mass is:
a. Gram
b. Kilogram
c. Milligram
d. Tonne
Correct Answer: b. Kilogram
Explanation:
The kilogram (kg) is the SI base unit of mass.
MCQ No. 75
The standard SI unit of time is:
a. Minute
b. Hour
c. Second
d. Millisecond
Correct Answer: c. Second
Explanation:
The second (s) is the SI base unit of time.
MCQ No. 76
The dimensional formula of velocity is:
a. [M L T⁻¹]
b. [L T⁻¹]
c. [M L² T⁻²]
d. [L² T⁻²]
Correct Answer: b. [L T⁻¹]
Explanation:
Velocity is displacement per unit time. Therefore, its dimensional formula is [L T⁻¹].
MCQ No. 77
The dimensional formula of acceleration is:
a. [L T⁻¹]
b. [L T⁻²]
c. [M L T⁻²]
d. [M L² T⁻²]
Correct Answer: b. [L T⁻²]
Explanation:
Acceleration is the rate of change of velocity with time.
MCQ No. 78
The dimensional formula of force is:
a. [M L T⁻²]
b. [M L² T⁻²]
c. [M T⁻²]
d. [L T⁻²]
Correct Answer: a. [M L T⁻²]
Explanation:
Force = Mass × Acceleration = [M][L T⁻²] = [M L T⁻²].
MCQ No. 79
The dimensional formula of work is:
a. [M L² T⁻²]
b. [M L T⁻²]
c. [L² T⁻²]
d. [M T⁻²]
Correct Answer: a. [M L² T⁻²]
Explanation:
Work = Force × Distance.
MCQ No. 80
The dimensional formula of power is:
a. [M L² T⁻²]
b. [M L² T⁻³]
c. [M L T⁻²]
d. [L² T⁻²]
Correct Answer: b. [M L² T⁻³]
Explanation:
Power is the rate of doing work.
MCQ No. 81
The dimensional formula of pressure is:
a. [M L⁻¹ T⁻²]
b. [M L T⁻²]
c. [M L² T⁻²]
d. [L⁻¹ T⁻²]
Correct Answer: a. [M L⁻¹ T⁻²]
Explanation:
Pressure = Force/Area.
MCQ No. 82
The dimensional formula of density is:
a. [M L⁻³]
b. [M L³]
c. [M L⁻²]
d. [M L T⁻²]
Correct Answer: a. [M L⁻³]
Explanation:
Density = Mass/Volume.
MCQ No. 83
The dimensional formula of momentum is:
a. [M L T⁻¹]
b. [M L² T⁻²]
c. [M L T⁻²]
d. [L T⁻¹]
Correct Answer: a. [M L T⁻¹]
Explanation:
Momentum = Mass × Velocity.
MCQ No. 84
Which method is commonly used to check the correctness of a physical equation?
a. Scientific notation
b. Significant figures
c. Dimensional analysis
d. Graph plotting
Correct Answer: c. Dimensional analysis
Explanation:
A physical equation is dimensionally correct only if both sides have the same dimensions.
MCQ No. 85
Dimensional analysis cannot be used to:
a. Check dimensional consistency
b. Derive relationships between quantities
c. Convert units
d. Determine exact numerical constants
Correct Answer: d. Determine exact numerical constants
Explanation:
Dimensional analysis cannot determine dimensionless numerical constants such as 2, π, or ½.
MCQ No. 86
Which instrument is commonly used to measure the diameter of a wire accurately?
a. Meter rule
b. Measuring tape
c. Vernier caliper
d. Micrometer screw gauge
Correct Answer: d. Micrometer screw gauge
Explanation:
A micrometer screw gauge measures very small diameters with high precision.
MCQ No. 87
Which instrument is best suited for measuring the internal diameter of a hollow pipe?
a. Meter rule
b. Vernier caliper
c. Measuring tape
d. Stopwatch
Correct Answer: b. Vernier caliper
Explanation:
The inside jaws of a vernier caliper are designed for measuring internal diameters.
MCQ No. 88
Which instrument is used to measure time intervals accurately in laboratory experiments?
a. Thermometer
b. Stopwatch
c. Balance
d. Vernier caliper
Correct Answer: b. Stopwatch
Explanation:
A stopwatch is commonly used to measure short time intervals.
MCQ No. 89
Which instrument measures mass?
a. Spring balance
b. Beam balance
c. Stopwatch
d. Thermometer
Correct Answer: b. Beam balance
Explanation:
A beam balance compares an object's mass with standard masses.
MCQ No. 90
A spring balance measures:
a. Mass
b. Weight
c. Density
d. Pressure
Correct Answer: b. Weight
Explanation:
A spring balance measures force, which is the weight of an object.
MCQ No. 91
Which SI unit is named after a scientist?
a. Metre
b. Second
c. Newton
d. Kilogram
Correct Answer: c. Newton
Explanation:
The unit of force, newton (N), is named after Sir Isaac Newton.
MCQ No. 92
Which of the following is an example of a derived SI unit named after a scientist?
a. Metre
b. Kelvin
c. Pascal
d. Both b and c
Correct Answer: d. Both b and c
Explanation:
The kelvin (temperature) is named after Lord Kelvin, and the pascal (pressure) is named after Blaise Pascal.
MCQ No. 93
The SI system is based on how many base quantities?
a. Five
b. Six
c. Seven
d. Eight
Correct Answer: c. Seven
Explanation:
The International System of Units (SI) is built on seven base quantities.
MCQ No. 94
Which of the following is NOT one of the seven SI base quantities?
a. Amount of substance
b. Luminous intensity
c. Force
d. Electric current
Correct Answer: c. Force
Explanation:
Force is a derived quantity, not a base quantity.
MCQ No. 95
The SI base unit of amount of substance is:
a. Gram
b. Mole
c. Atom
d. Kilogram
Correct Answer: b. Mole
Explanation:
The mole (mol) is the SI base unit for the amount of substance.
MCQ No. 96
Which quantity is obtained by multiplying mass and acceleration?
a. Work
b. Momentum
c. Force
d. Pressure
Correct Answer: c. Force
Explanation:
According to Newton's Second Law, Force = Mass × Acceleration.
MCQ No. 97
Which quantity is equal to force multiplied by displacement?
a. Pressure
b. Energy (Work)
c. Power
d. Momentum
Correct Answer: b. Energy (Work)
Explanation:
Work is done when a force causes displacement in its direction.
MCQ No. 98
Which quantity is equal to work done per unit time?
a. Pressure
b. Velocity
c. Power
d. Energy
Correct Answer: c. Power
Explanation:
Power is defined as the rate of doing work.
MCQ No. 99
Which quantity is defined as mass per unit volume?
a. Pressure
b. Density
c. Force
d. Weight
Correct Answer: b. Density
Explanation:
Density is the ratio of mass to volume.
MCQ No. 100
Why is the International System of Units (SI) used worldwide?
a. It is the oldest system of measurement.
b. It provides a uniform and internationally accepted standard for measurements.
c. It uses only metric units.
d. It eliminates all measurement errors.
Correct Answer: b. It provides a uniform and internationally accepted standard for measurements.
Explanation:
The SI system ensures consistency, accuracy, and uniformity in scientific, engineering, industrial, and commercial measurements across the world.
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