Questions and Answers
What is the Ohm a unit of?
Which of the following is the SI unit of weight?
What is the SI unit of stress?
Which physical quantity uses the unit Pascal?
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What is the dimensional formula for weight?
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What is the traditional unit of radioactivity that measures the amount of radiation emitted by a radioactive material?
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What physical quantity is measured in joules?
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Which SI unit is defined as the amount of a radioactive substance showing one disintegration per second?
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What is the SI unit for magnetic flux?
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What is the SI unit of electrical resistance?
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Which of the following quantities is measured in Candela?
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Which of the following is not a unit of temperature?
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What is the primary reason for presbyopia?
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Which physical quantity does NOT have the unit of Joules?
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What is the SI unit of force?
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Which statement about a light-year is correct?
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Which unit was defined as the measurement of the total magnetic field passing through a given area?
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Which of these quantities is expressed in Joules?
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What is the SI unit of electrical resistivity?
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What is the SI unit of induced potential difference?
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The unit of force is derived from which of the following equations?
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How many watts are there in one horsepower?
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What is the electrical equivalent of 1 kilowatt?
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If 1 kWh equals 3.6 × 10^6 Joules, how much energy is in 5.5 kWh?
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Which unit represents the rate of electric charge flow per second?
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What is equivalent to one Pico meter?
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How much energy is represented by 5.6 kWh in Joules?
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Which of the following correctly defines the relationship between kilowatts and watts?
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What is 1 coulomb per second equivalent to?
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What does the unit of electric current, ampere, represent?
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Which unit measures the consumption of electricity when using 1000 Watts for one hour?
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What does the term 'coulomb per second' signify?
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What is equal to 746 watts?
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What unit is used to measure the intensity of illumination?
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What does the symbol 1 Q/s represent?
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What is the SI unit of resistance named after a physicist?
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What does 1 diopter measure?
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Study Notes
Power and Energy
- 1 horsepower is equivalent to 746 watts in the International System of Units (SI).
- A kilowatt (kW) represents 1,000 watts or Joules per second (1 kW = 1,000 J/s).
- Electric bills are charged based on energy consumption measured in kilowatt-hours (kWh); 1 kWh equals 3.6 million Joules (3.6 × 10^6 J).
- 5.5 kWh converts to 19.80 × 10^6 J, calculated as 5.5 × 3.6 × 10^6 J.
Units of Measurement
- SI unit of electrical resistivity is ohm-meter.
- The measurement of the electrical potential difference or induced emf is expressed in volts (V).
- The unit of force in SI is the Newton (N), which equals kg·m/s².
- Magnetic flux is measured in Webers (Wb), representing the total magnetic field passing through an area.
Measurement Conversion and Equivalents
- 1 coulomb per second is defined as 1 ampere (A), indicating the flow of electric charge.
- Power is expressed in watts (W) in the SI system, related to energy and work measured in Joules (J).
- 1 Pico meter is equal to 10⁻¹² meters, a unit of distance in scientific contexts.
Additional Physics Concepts
- Light-year is a unit of distance equal to the distance light travels in one year, approximately 9.461 × 10¹² kilometers.
- The Curie is a unit of radioactivity equivalent to 3.7 × 10¹⁰ disintegrations/second.
- Electrical resistance is a measure of opposition to current flow, with the SI unit being ohm (Ω).
Optical and Thermal Units
- 1 diopter refers to the optical power of a lens and is the reciprocal of the focal length in meters.
- Temperature units include Fahrenheit, Celsius, and Kelvin, with Pascal as a unit of pressure, differentiating it from temperature measurement.
General Physics Principles
- Work (W) is defined mathematically as W = F·S·cos(θ), where F is force and S is displacement.
- The unit of stress in SI is Pascal (Pa), representing force per unit area (N/m²).
- Momentum is measured in kg·m/s, establishing a connection between mass and velocity.
These notes encapsulate critical definitions, unit conversions, and important physics principles, aiding comprehension and retention of fundamental concepts in Physics.
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Description
Test your knowledge of power, energy, and measurement units in this comprehensive quiz. Learn about concepts like horsepower, kilowatt-hours, and the SI units for measuring electrical quantities. This quiz will cover essential conversions and help reinforce your understanding of fundamental physics concepts.
