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Questions and Answers
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.
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?
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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?
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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?
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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?
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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?
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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.
