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Questions and Answers
What is the Ohm a unit of?
What is the Ohm a unit of?
Which of the following is the SI unit of weight?
Which of the following is the SI unit of weight?
What is the SI unit of stress?
What is the SI unit of stress?
Which physical quantity uses the unit Pascal?
Which physical quantity uses the unit Pascal?
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What is the dimensional formula for weight?
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?
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?
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?
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?
What is the SI unit for magnetic flux?
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What is the SI unit of electrical resistance?
What is the SI unit of electrical resistance?
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Which of the following quantities is measured in Candela?
Which of the following quantities is measured in Candela?
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Which of the following is not a unit of temperature?
Which of the following is not a unit of temperature?
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What is the primary reason for presbyopia?
What is the primary reason for presbyopia?
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Which physical quantity does NOT have the unit of Joules?
Which physical quantity does NOT have the unit of Joules?
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What is the SI unit of force?
What is the SI unit of force?
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Which statement about a light-year is correct?
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?
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?
Which of these quantities is expressed in Joules?
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What is the SI unit of electrical resistivity?
What is the SI unit of electrical resistivity?
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What is the SI unit of induced potential difference?
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?
The unit of force is derived from which of the following equations?
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How many watts are there in one horsepower?
How many watts are there in one horsepower?
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What is the electrical equivalent of 1 kilowatt?
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?
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?
Which unit represents the rate of electric charge flow per second?
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What is equivalent to one Pico meter?
What is equivalent to one Pico meter?
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How much energy is represented by 5.6 kWh in Joules?
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?
Which of the following correctly defines the relationship between kilowatts and watts?
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What is 1 coulomb per second equivalent to?
What is 1 coulomb per second equivalent to?
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What does the unit of electric current, ampere, represent?
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?
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?
What does the term 'coulomb per second' signify?
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What is equal to 746 watts?
What is equal to 746 watts?
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What unit is used to measure the intensity of illumination?
What unit is used to measure the intensity of illumination?
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What does the symbol 1 Q/s represent?
What does the symbol 1 Q/s represent?
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What is the SI unit of resistance named after a physicist?
What is the SI unit of resistance named after a physicist?
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What does 1 diopter measure?
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.
