Units and Measurements MCQs 2026

50 questions with detailed answers · 20 from past papers · 5 quiz batches available

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Page 1 of 1 Questions 1–10 of 50

Q1 medium

The unit used to express large astronomical distances, defined as the distance light travels in one year, is the
1. A Parsec
2. B Angstrom
3. C Light year
4. D Astronomical unit
💡 Explanation:
A light year is the distance light travels in vacuum in one year.
Q2 medium

The typical least count of a screw gauge is about
1. A 0.1 cm
2. B 0.01 cm
3. C 1 cm
4. D 0.001 cm
💡 Explanation:
A screw gauge commonly has a least count of about 0.001 cm (0.01 mm).
Q3 medium

An instrument more precise than the vernier caliper, used to measure the diameter of a thin wire, is the
1. A Vernier caliper
2. B Screw gauge
3. C Metre rule
4. D Spring balance
💡 Explanation:
The screw gauge (micrometer) has a smaller least count than the vernier caliper.
Q4 medium

The least count of a common vernier caliper with 10 vernier divisions is typically
1. A 0.01 cm
2. B 0.1 cm
3. C 0.001 cm
4. D 1 cm
💡 Explanation:
Least count equals one main scale division divided by the number of vernier divisions, usually 0.01 cm.
Q5 medium

An instrument commonly used to measure small lengths, such as the diameter of a rod, with a sliding scale is the
1. A Metre rule
2. B Measuring tape
3. C Vernier caliper
4. D Protractor
💡 Explanation:
A vernier caliper uses a main scale and a sliding vernier scale to measure small lengths precisely.
Q6 medium

The dimensional formula of density is
1. A [ML^3]
2. B [ML^-1]
3. C [MLT^-3]
4. D [ML^-3]
💡 Explanation:
Density is mass per unit volume, giving mass divided by length cubed.
Q7 medium

The dimensional formula of acceleration is
1. A [LT^-1]
2. B [LT^-2]
3. C [MLT^-2]
4. D [L^2T^-2]
💡 Explanation:
Acceleration is the rate of change of velocity, giving length divided by time squared.
Q8 medium

The dimensional formula of velocity is
1. A [LT^-1]
2. B [LT^-2]
3. C [MLT^-1]
4. D [L^2T^-1]
💡 Explanation:
Velocity is displacement per unit time, giving length divided by time.
Q9 hard

The dimensional formula of pressure is
1. A [MLT^-2]
2. B [ML^2T^-2]
3. C [ML^-1T^-2]
4. D [ML^-3]
💡 Explanation:
Pressure is force per unit area, giving mass, length^-1, and time^-2.
Q10 hard

The dimensional formula of power is
1. A [ML^2T^-2]
2. B [MLT^-2]
3. C [ML^-1T^-2]
4. D [ML^2T^-3]
💡 Explanation:
Power is work done per unit time, so its dimension is energy dimension divided by time.
Q11 hard

The dimensional formula of work and energy is
1. A [ML^2T^-2]
2. B [MLT^-2]
3. C [ML^2T^-3]
4. D [ML^-1T^-2]
💡 Explanation:
Work equals force times distance, giving mass, length squared, and time^-2.
Q12 medium

In significant figures, all non-zero digits and zeros between non-zero digits are considered
1. A Not significant
2. B Significant
3. C Approximate only
4. D Irrelevant
💡 Explanation:
Non-zero digits and zeros trapped between them always count as significant figures.
Q13 Past Paper · PPSC/FPSC/NTS easy

The SI unit of power is
1. A Watt
2. B Joule
3. C Newton
4. D Volt
💡 Explanation:
The watt equals one joule per second and is the SI unit of power.
Q14 easy

On the Kelvin scale, absolute zero is defined as
1. A 0 K
2. B 100 K
3. C 273 K
4. D -273 K
💡 Explanation:
The Kelvin scale is defined so that absolute zero is exactly 0 K.
Q15 Past Paper · PPSC/FPSC/NTS easy

The SI unit of electric potential is
1. A Ampere
2. B Volt
3. C Ohm
4. D Watt
💡 Explanation:
The volt is the SI unit of electric potential difference.
Q16 Past Paper · PPSC/FPSC/NTS easy

The SI unit of length is
1. A Foot
2. B Metre
3. C Yard
4. D Inch
💡 Explanation:
The metre is the SI base unit of length.
Q17 Past Paper · PPSC/FPSC/NTS easy

The SI unit of temperature is
1. A Celsius
2. B Fahrenheit
3. C Kelvin
4. D Rankine
💡 Explanation:
The kelvin is the SI base unit of thermodynamic temperature.
Q18 Past Paper · PPSC/FPSC/NTS easy

The SI unit of time is
1. A Second
2. B Minute
3. C Hour
4. D Day
💡 Explanation:
The second is the SI base unit of time.
Q19 Past Paper · PPSC/FPSC/NTS easy

The SI unit of electric current is
1. A Ampere
2. B Volt
3. C Ohm
4. D Watt
💡 Explanation:
The ampere is the SI base unit of electric current.
Q20 Past Paper · PPSC/FPSC/NTS easy

The SI unit of electrical resistance is
1. A Farad
2. B Henry
3. C Ohm
4. D Siemens
💡 Explanation:
The ohm is the SI unit of electrical resistance.
Q21 hard

The dimensional formula of force is
1. A [ML^2T^-2]
2. B [MLT^-2]
3. C [ML^-1T^-2]
4. D [MLT^-1]
💡 Explanation:
Force = mass x acceleration, giving dimensions of mass, length, and time^-2.
Q22 medium

The number of fundamental base quantities in the SI system is
1. A 5
2. B 6
3. C 7
4. D 8
💡 Explanation:
SI defines seven base quantities: length, mass, time, current, temperature, amount of substance, and luminous intensity.
Q23 Past Paper · PPSC/FPSC/NTS medium

The SI unit of inductance is
1. A Farad
2. B Weber
3. C Tesla
4. D Henry
💡 Explanation:
The henry is the SI unit of electrical inductance.
Q24 Past Paper · PPSC/FPSC/NTS medium

The SI unit of magnetic flux density is
1. A Weber
2. B Tesla
3. C Gauss
4. D Henry
💡 Explanation:
The tesla is the SI unit of magnetic flux density; gauss is the older CGS unit.
Q25 Past Paper · PPSC/FPSC/NTS medium

The SI unit of magnetic flux is
1. A Weber
2. B Tesla
3. C Henry
4. D Gauss
💡 Explanation:
The weber is the SI unit of magnetic flux.
Q26 easy

The metric prefix "milli" represents a factor of
1. A 10^-3
2. B 10^-6
3. C 10^3
4. D 10^-2
💡 Explanation:
Milli denotes a factor of one thousandth (10^-3).
Q27 easy

The metric prefix "mega" represents a factor of
1. A 10^3
2. B 10^6
3. C 10^9
4. D 10^-6
💡 Explanation:
Mega denotes a factor of one million (10^6).
Q28 Past Paper · PPSC/FPSC/NTS easy

The SI unit of capacitance is
1. A Henry
2. B Weber
3. C Tesla
4. D Farad
💡 Explanation:
The farad is the SI unit of electrical capacitance.
Q29 easy

The metric prefix "micro" represents a factor of
1. A 10^-3
2. B 10^-9
3. C 10^6
4. D 10^-6
💡 Explanation:
Micro denotes a factor of one millionth (10^-6).
Q30 easy

The metric prefix "giga" represents a factor of
1. A 10^6
2. B 10^12
3. C 10^9
4. D 10^-9
💡 Explanation:
Giga denotes a factor of one billion (10^9).
Q31 easy

The metric prefix "nano" represents a factor of
1. A 10^-9
2. B 10^-6
3. C 10^-12
4. D 10^9
💡 Explanation:
Nano denotes a factor of one billionth (10^-9).
Q32 medium

The metric prefix "tera" represents a factor of
1. A 10^9
2. B 10^12
3. C 10^15
4. D 10^6
💡 Explanation:
Tera denotes a factor of one trillion (10^12).
Q33 medium

The metric prefix "pico" represents a factor of
1. A 10^-9
2. B 10^-6
3. C 10^-3
4. D 10^-12
💡 Explanation:
Pico denotes a factor of one trillionth (10^-12).
Q34 easy

The CGS unit of force is the
1. A Newton
2. B Joule
3. C Dyne
4. D Erg
💡 Explanation:
The dyne is the unit of force in the CGS system.
Q35 easy

The CGS unit of energy is the
1. A Dyne
2. B Erg
3. C Joule
4. D Calorie
💡 Explanation:
The erg is the unit of energy in the CGS system.
Q36 medium

One newton is equal to
1. A 10^5 dynes
2. B 10^3 dynes
3. C 10^7 dynes
4. D 10^2 dynes
💡 Explanation:
Since 1 N = 1 kg.m/s^2 and 1 dyne = 1 g.cm/s^2, one newton equals 10^5 dynes.
Q37 medium

One joule is equal to
1. A 10^5 ergs
2. B 10^3 ergs
3. C 10^7 ergs
4. D 10^9 ergs
💡 Explanation:
Since 1 J = 1 kg.m^2/s^2 and 1 erg = 1 g.cm^2/s^2, one joule equals 10^7 ergs.
Q38 easy

The metric prefix "kilo" represents a factor of
1. A 10^2
2. B 10^-3
3. C 10^3
4. D 10^6
💡 Explanation:
Kilo denotes a multiplication factor of one thousand (10^3).
Q39 Past Paper · PPSC/FPSC/NTS easy

Absolute zero temperature corresponds to approximately
1. A 0 degrees Celsius
2. B 100 degrees Celsius
3. C -100 degrees Celsius
4. D -273.15 degrees Celsius
💡 Explanation:
Absolute zero, the lowest possible temperature, is -273.15 degrees Celsius.
Q40 easy

One nanometre is equal to
1. A 10^-6 metre
2. B 10^-12 metre
3. C 10^-10 metre
4. D 10^-9 metre
💡 Explanation:
A nanometre equals 10^-9 metre.
Q41 easy

One micron is equal to
1. A 10^-6 metre
2. B 10^-9 metre
3. C 10^-3 metre
4. D 10^-12 metre
💡 Explanation:
A micron (micrometre) equals 10^-6 metre.
Q42 medium

One angstrom, commonly used to measure atomic and molecular sizes, equals
1. A 10^-9 metre
2. B 10^-10 metre
3. C 10^-8 metre
4. D 10^-12 metre
💡 Explanation:
One angstrom equals 10^-10 metre.
Q43 Past Paper · PPSC/FPSC/NTS easy

The SI unit of force is
1. A Dyne
2. B Pascal
3. C Newton
4. D Joule
💡 Explanation:
The newton is the SI derived unit of force, defined as kg.m/s^2.
Q44 Past Paper · PPSC/FPSC/NTS easy

The SI unit of amount of substance is
1. A Molecule
2. B Molarity
3. C Litre
4. D Mole
💡 Explanation:
The mole is the SI base unit for amount of substance.
Q45 Past Paper · PPSC/FPSC/NTS easy

The SI unit of pressure is
1. A Newton
2. B Joule
3. C Bar
4. D Pascal
💡 Explanation:
The pascal is the SI derived unit of pressure, equal to one newton per square metre.
Q46 Past Paper · PPSC/FPSC/NTS easy

The SI unit of mass is
1. A Gram
2. B Pound
3. C Ounce
4. D Kilogram
💡 Explanation:
The kilogram is the SI base unit of mass.
Q47 Past Paper · PPSC/FPSC/NTS easy

The SI unit of electric charge is
1. A Coulomb
2. B Ampere
3. C Farad
4. D Ohm
💡 Explanation:
The coulomb is the SI unit of electric charge, equal to one ampere-second.
Q48 Past Paper · PPSC/FPSC/NTS easy

The SI unit of frequency is
1. A Watt
2. B Volt
3. C Hertz
4. D Tesla
💡 Explanation:
The hertz measures the number of cycles per second.
Q49 Past Paper · PPSC/FPSC/NTS easy

The SI unit of luminous intensity is
1. A Lumen
2. B Candela
3. C Lux
4. D Watt
💡 Explanation:
The candela is the SI base unit of luminous intensity.
Q50 Past Paper · PPSC/FPSC/NTS easy

The SI unit of work and energy is
1. A Watt
2. B Joule
3. C Newton
4. D Pascal
💡 Explanation:
The joule is the SI derived unit of work and energy.

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Units and Measurements MCQs 2026

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