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mediumQ. No. 12081-which-option-correctly-matches-distance-electric-charge-electric-current-and-energy-with-their-si

Which option correctly matches distance, electric charge, electric current and energy with their SI units?

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Least count, zero error and calibration commonly appear in examination questions. Dimensional analysis helps check equations and convert units, although it cannot determine a dimensionless numerical constant. Learners should write the given quantity, convert all values to compatible units, apply the defining relation and attach the correct final unit. Common mistakes include confusing mass with weight, energy with power, pressure with force and scalar quantities with vectors. The correct option must match the quantity, standard unit and physical meaning together. Option B (“Distance-joule, charge-meter, current-coulomb, energy-ampere”) is incorrect because it represents a different unit, dimension, instrument, quantity or measurement relationship from the one asked.

ADistance-meter, charge-coulomb, current-ampere, energy-joule
BDistance-joule, charge-meter, current-coulomb, energy-ampere
CDistance-ampere, charge-joule, current-meter, energy-coulomb
DDistance-coulomb, charge-ampere, current-joule, energy-meter
Correct Answer: Distance-meter, charge-coulomb, current-ampere, energy-jouleYour Answer: A

Explanation

correct index and explanation fully aligned. These are the standard SI units of the given quantities. Option B (“Distance-joule, charge-meter, current-coulomb, energy-ampere”) is incorrect because it represents a different unit, dimension, instrument, quantity or measurement relationship from the one asked. Option C (“Distance-ampere, charge-joule, current-meter, energy-coulomb”) is incorrect because it represents a different unit, dimension, instrument, quantity or measurement relationship from the one asked. Option D (“Distance-coulomb, charge-ampere, current-joule, energy-meter”) is incorrect because it represents a different unit, dimension, instrument, quantity or measurement relationship from the one asked. Match the quantity with its definition, SI unit and dimension. This keeps the selected index, answer and explanation consistent., current-ampere, energy-joule — is correct. This answer matches the exact geographical clue in the question. Option B, “Distance-joule, charge-meter, current-coulomb, energy-ampere”, is incorrect for this question because it does not match the precise location, process, landform, climatic feature or geographical relationship identified by the evidence. Option C, “Distance-ampere, charge-joule, current-meter, energy-coulomb”, is incorrect for this question because it does not match the precise location, process, landform, climatic feature or geographical relationship identified by the evidence. Option D, “Distance-coulomb, charge-ampere, current-joule, energy-meter”, is incorrect for this question because it does not match the precise location, process, landform, climatic feature or geographical relationship identified by the evidence. The central concept is that geographical facts must be evaluated with their location, scale, process and time frame. This distinction removes the most common confusion and keeps the selected answer, correct index and explanation fully aligned.

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Units and Measurements FAQs

Common questions and clear answers for this topic.

What are Units and Measurements and which system is internationally accepted?

Units and Measurements involve quantifying physical quantities. The SI (Systeme International) is the internationally accepted system with 7 base units: metre (m) for length, kilogram (kg) for mass, second (s) for time, ampere (A) for electric current, kelvin (K) for temperature, mole (mol) for amount of substance, and candela (cd) for luminous intensity. Units and Measurements is an important Physics topic for SSC CGL, Railway, and UPSC.

What are the units of important physical quantities?

Important Physical Quantities and SI Units: Force - Newton (N), Pressure - Pascal (Pa), Energy/Work - Joule (J), Power - Watt (W), Electric charge - Coulomb (C), Electric potential - Volt (V), Resistance - Ohm, Capacitance - Farad (F), Frequency - Hertz (Hz), Temperature - Kelvin (K) or Celsius (C). These units are frequently asked in SSC CGL, Railway NTPC, and Physics GK sections.

What are the common unit conversions needed for competitive exams?

Important Unit Conversions: Length: 1 km = 1000 m, 1 m = 100 cm, 1 inch = 2.54 cm, 1 foot = 12 inches. Mass: 1 kg = 1000 g, 1 quintal = 100 kg, 1 metric ton = 1000 kg. Area: 1 hectare = 10,000 sq m, 1 acre = 4047 sq m. Speed: 1 km/hr = 5/18 m/s. Pressure: 1 atm = 101325 Pa = 760 mmHg. Temperature: C = (F-32) x 5/9, K = C + 273.15.

What is the difference between scalar and vector quantities?

Scalar quantities have only magnitude (no direction): mass, length, time, speed, temperature, energy, volume, density. Vector quantities have both magnitude and direction: displacement, velocity, acceleration, force, momentum, electric field. Speed (scalar) vs Velocity (vector): Speed is distance/time, Velocity is displacement/time. These distinctions are important for Physics questions in SSC CGL, NDA, and Railway exams.

What are the important measuring instruments and what they measure?

Important Measuring Instruments: Thermometer (temperature), Barometer (atmospheric pressure), Hygrometer (humidity), Lactometer (purity of milk), Seismograph (earthquakes), Speedometer (speed of vehicle), Altimeter (altitude), Ammeter (electric current), Voltmeter (voltage), Galvanometer (small current), Manometer (gas pressure), Anemometer (wind speed), Hydrometer (specific gravity of liquids).