NEET Physics: Units of measurements Practice Questions
15 free multiple-choice questions on Units of measurements (Physics and Measurement) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which of the following is a base SI unit for the physical quantity electric current?
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Correct answer: D — Ampere
The base SI unit for electric current is the Ampere (A). Volt is the unit for potential difference, Ohm is the unit for resistance, and Watt is the unit for power (derived unit).
Q2. If the unit of length is defined as the meter, what is the SI unit for electric current?
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Correct answer: B — Ampere
The SI unit for electric current is the Ampere (A). Volt is for potential difference, Ohm is for resistance, and Watt is for power.
Q3. Which of the following is a fundamental physical quantity in the SI system?
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Correct answer: D — Time
Time is a fundamental quantity, and its SI unit is the second (s). Force, velocity, and density are derived quantities.
Q4. What is the SI unit for measuring the physical quantity of time?
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Correct answer: D — second
The second (s) is the base SI unit for time.
Q5. The unit used to measure electric current in the SI system is the Ampere. This unit is considered a derived unit based on which fundamental quantities?
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Correct answer: B — Length and Time
Electric current (Ampere) is derived from the definitions of charge, current, and time. While Ampere is a base unit for current, its dimensional dependence (derived from base units like length, time, and mass/charge) makes it a derived unit in the context of dimensional analysis, though it is often treated as a base unit in specific contexts. For this level, understanding that derived units relate to base units is key.
Q6. If the mass of an object is measured in kilograms, the corresponding unit in the CGS system would be:
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Correct answer: C — Gram
The CGS system uses the gram (g) as its unit of mass. Therefore, 1 kg is equal to 1000 g.
Q7. The prefix used to denote 10⁻⁶ in the SI system is:
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Correct answer: A — Micro
The prefix for 10⁻⁶ is micro (μ). Kilo is 10³, Mega is 10⁶, and Nano is 10⁻⁹.
Q8. Which of the following pairs is not a pair of fundamental units in the SI system?
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Correct answer: C — ampere and mole
The fundamental units in the SI system are meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). The mole is a derived unit, not a base unit.
Q9. The SI unit for luminous intensity is the candela (cd). What is the SI unit for electric current?
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Correct answer: C — Ampere
The SI unit for electric current is the Ampere (A).
Q10. Which pair of units represents a derived quantity?
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Correct answer: A — force and pressure
Force and pressure are derived quantities, meaning they are expressed in terms of base units (like meter, kilogram, second) through multiplication or division.
Q11. Which of the following is the SI unit for luminous intensity?
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Correct answer: D — Candela
The SI unit for luminous intensity (which measures the intensity of light) is the Candela (cd).
Q12. If the base unit of length is the meter (m), what is the SI unit for measuring mass?
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Correct answer: B — kilogram
The SI unit for mass is the kilogram (kg).
Q13. The prefix 'micro' (μ) represents which factor when used in SI units?
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Correct answer: D — 10⁻⁹
The prefix micro (μ) represents 10⁻⁶. Therefore, a microgram is 10⁻⁶ grams.
Q14. Which of the following is a derived unit?
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Correct answer: B — Velocity
Velocity is a derived quantity (length/time), so its unit is derived from the base units meter and second. Meter, second, and kilogram are base units.
Q15. The prefix 'kilo' (k) represents which factor in the SI system?
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Correct answer: A — 10³
The prefix 'kilo' (k) means 1000. Therefore, one kilo unit is equal to 10³ of the base unit.
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