Podcast
Questions and Answers
Which of the following closely defines the SI unit of luminous intensity?
Which of the following closely defines the SI unit of luminous intensity?
Identify which of the following is not classified as a derived physical quantity.
Identify which of the following is not classified as a derived physical quantity.
What is the impact on the horizontal range of a projectile if its initial speed is doubled while keeping the projection angle constant?
What is the impact on the horizontal range of a projectile if its initial speed is doubled while keeping the projection angle constant?
What does the speedometer measure in a vehicle?
What does the speedometer measure in a vehicle?
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Which of the following represents the correct dimension formula of stress?
Which of the following represents the correct dimension formula of stress?
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What happens to the pressure in a liquid when air is pumped out of a closed jar containing the liquid?
What happens to the pressure in a liquid when air is pumped out of a closed jar containing the liquid?
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Which of the following substances exhibits the highest viscosity?
Which of the following substances exhibits the highest viscosity?
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When a metal bar heats up, which of the following factors contributes to a greater increase in its length?
When a metal bar heats up, which of the following factors contributes to a greater increase in its length?
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Wein's displacement law is primarily utilized to measure which characteristic of a star?
Wein's displacement law is primarily utilized to measure which characteristic of a star?
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What is the primary purpose of polishing a thermos flask?
What is the primary purpose of polishing a thermos flask?
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The SI unit of compressibility is measured in which units?
The SI unit of compressibility is measured in which units?
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As the temperature of a gas increases, what is the effect on its viscosity?
As the temperature of a gas increases, what is the effect on its viscosity?
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How does pressure at a point in a liquid vary with the depth of the point?
How does pressure at a point in a liquid vary with the depth of the point?
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Study Notes
SI Units
- The SI unit for luminous intensity is the candela (cd).
- Ampere (A), meter (m), and kilogram (kg) are SI units for electric current, length, and mass respectively.
- Derived physical quantities are units derived from the fundamental SI units.
- Speed, volume, and force are examples of derived quantities.
- Mass is a fundamental SI unit, not a derived quantity.
Rounding off to Significant Figures
- When rounding off to 3 significant figures:
- 2.745 rounds to 2.75
- 2.735 rounds to 2.74
Velocity-Time Graphs
- The slope of a velocity-time graph represents the acceleration of an object.
Speedometers
- A speedometer measures the instantaneous speed of a vehicle, which is the magnitude of its velocity at a specific moment in time, not the average speed or average velocity.
Vectors
- The angle between two equal vectors is 0°, 60°, or 120°.
Projectile Motion
- Doubling the initial speed of a projectile, while keeping the projection angle constant, quadruples the horizontal range.
Elasticity
- Steel is more elastic than rubber because, under the same deforming force, steel experiences a smaller deformation than rubber.
Stress
- The dimensional formula of stress is $ML^{-1}T^{-2}$.
Pressure in Liquids
- When air is pumped out of a closed jar containing a beaker of liquid, the pressure in the liquid near the bottom of the liquid:
- Initially decreases due to reduced atmospheric pressure.
- Then increases, because the liquid vapor pressure starts to contribute more significantly as the air pressure is reduced.
Viscosity
- Honey is more viscous than water.
Thermal Expansion
- The increase in length of a metal bar when heated is greater if:
- The bar is longer
- The temperature rise is larger.
Wein's Displacement Law
- Wein's displacement law can be used to determine the temperature of a star based on the wavelength at which it radiates the most energy.
Thermos Flasks
- A thermos flask is polished to reflect all radiation from outside, which helps minimize heat loss through radiation.
Supplementary SI Unit
- Steradian is a supplementary SI unit, used to measure solid angles.
Negative Acceleration
- Negative acceleration signifies a decrease in velocity.
Compressibility
- Per pascal is the SI unit of compressibility.
Viscosity and Temperature
- The viscosity of a gas increases as its temperature increases.
Thermal Conduction
- Solids are heated by the mode of conduction.
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Description
This quiz covers fundamental concepts in physics including SI units, significant figures, velocity-time graphs, and projectile motion. Test your knowledge of these key topics that form the foundation of understanding physical quantities and their applications.
