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Questions and Answers
What is the unit of work?
What is the unit of work?
What is the time it takes for the ultrasonic impulse to travel to the obstacle and back?
What is the time it takes for the ultrasonic impulse to travel to the obstacle and back?
What is the unit of specific heat of fusion?
What is the unit of specific heat of fusion?
What is the pressure at a depth of 70 meters in the Orlik Dam?
What is the pressure at a depth of 70 meters in the Orlik Dam?
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Which of the following pressure units are equal?
Which of the following pressure units are equal?
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What is the charge lost by the battery?
What is the charge lost by the battery?
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What happens to the gravitational force between two objects if the distance between them is quadrupled?
What happens to the gravitational force between two objects if the distance between them is quadrupled?
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Under what conditions does a convex lens produce a real, inverted, and magnified image?
Under what conditions does a convex lens produce a real, inverted, and magnified image?
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What happens to the frequency of light when it passes from a vacuum into an optical medium?
What happens to the frequency of light when it passes from a vacuum into an optical medium?
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What factors does the magnitude of the buoyant force acting on a fully submerged body depend on?
What factors does the magnitude of the buoyant force acting on a fully submerged body depend on?
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What type of particle is emitted when a radioactive element shifts one position to the left in the periodic table?
What type of particle is emitted when a radioactive element shifts one position to the left in the periodic table?
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What is the wavelength of the boundary between IR and visible light?
What is the wavelength of the boundary between IR and visible light?
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What is the efficiency of an electric machine given by?
What is the efficiency of an electric machine given by?
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What happens to the power radiated by a heating element when the voltage is halved?
What happens to the power radiated by a heating element when the voltage is halved?
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What is the unit of specific heat of fusion?
What is the unit of specific heat of fusion?
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What is the condition for the formation of vapor in a liquid?
What is the condition for the formation of vapor in a liquid?
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Study Notes
Units of Measurement
- The unit of work is Joules (J)
- The unit of energy is Joules (J)
- The unit of specific heat capacity is J/kg°C
- The unit of measurement for pressure is Pascals (Pa)
Ultrasonic Distance Measurement
- The time taken for the ultrasonic impulse to travel to the obstacle and back is 2 x distance / speed of sound
- In this case, the distance is 66 meters, and the time taken is 400 ms
Specific Latent Heat
- The specific latent heat of fusion is expressed in J/kg
- It is the amount of energy required to change the state of 1 kg of a substance from solid to liquid
Pressure in Orlicka Dam
- The maximum depth of the Orlicka Dam is 70 meters
- The pressure at this depth is equal to 700 kPa plus the atmospheric pressure
Barometric Pressure
- Barometric pressure can be expressed in different units
- 1 bar is equal to 100 kPa, and 760 Torr is equal to 760 mmHg
Electric Charge
- A fully charged battery with a capacity of 4 Ah is discharged to half its capacity with a constant current of 50 mA
- The amount of charge lost is 1440 C
Gravitational Force
- The gravitational force between two objects decreases with an increase in distance
- If the distance between the objects is quadrupled, the gravitational force decreases by a factor of 16
Image Formation by Lenses
- A convex lens can form a real, inverted, and magnified image when the object is placed between the focal length and the lens
- The object distance must be greater than the focal length of the lens for this to occur
Light and Optics
- When light transitions from a vacuum to an optical medium, its frequency remains unchanged.
- The speed of light changes when it enters an optical medium.
Fluid Dynamics
- The magnitude of the buoyant force acting on a fully submerged object depends on the object's volume and the density of the fluid.
- The buoyant force does not depend on the object's density.
Radioactivity
- When a radioactive element emits a particle, it shifts one place to the left in the periodic table.
- The emitted particle is not an electron or a helion.
Energy and Work
- The unit of work is not Watt (W).
- The unit of work can be Joule (J), Watt-second (Ws), or Newton-meter (Nm).
Electromagnetic Spectrum
- The boundary between infrared and visible light corresponds to a wavelength of 760 nm.
Efficiency of Machines
- The efficiency of an electrical machine is given by the ratio of output power to input power.
Heating and Temperature
- When a heating element is connected to a voltage that is half the original value, its power output will decrease by a factor of four.
- The efficiency of a heating element is not directly proportional to the voltage.
Thermodynamics
- The unit of specific latent heat of fusion is J/kg.
Energy and Kinematics
- The energy released when an object falls from a height of 20 m is equal to 1600 J.
- The mass of the object can be calculated from the energy released.
Phase Transitions
- Boiling of a liquid occurs when the pressure of the saturated vapor in the liquid equals the surrounding pressure.
Radioactive Decay
- The half-life of a short-lived isotope can be calculated from the decrease in activity over time.
- The activity of the isotope decreases by a factor of 2 every half-life.
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Description
Multiple choice questions covering physics concepts, including units, measurement, and thermodynamics.
