विज्ञान
MediumQ. No. lumen-is-the-unit-of-which-quantity
ल्यूमेन किसका मात्रक है?
Last Updated:
Aज्योति तीव्रता
Bज्योति फ्लक्स
Cउपर्युक्त दोनों
Dइनमें से कोई नहीं
Correct Answer: ज्योति फ्लक्सYour Answer: B
Explanation
ल्यूमेन ज्योति फ्लक्स का SI मात्रक है।
Important Notes
- ज्योति फ्लक्स ko concept ke saath revise karein.
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यह सामग्री अभी उपलब्ध न...
विज्ञान
Answer
ज्योति फ्लक्स
Exam Info
- Asked in: SSC, Railway, Banking and other competitive exams.
- Also asked in: RRB NTPC, CHSL, State PCS and online mock tests.
- Topic: यह सामग्री अभी उपलब्ध नहीं है।
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FAQ
यह सामग्री अभी उपलब्ध नहीं है। 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).