GS One‑Liners
high‑yield facts · smart revision
5107
facts
5107
results
Latest facts first
| # | Question & Answer |
|---|---|
| 4151 |
What is entropy?
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Measure of disorder or randomness in a system
|
| 4152 |
What is the Second Law of Thermodynamics (basic)?
-
Heat cannot spontaneously flow from a colder body to a hotter body; entropy of the universe always increases
|
| 4153 |
What is the First Law of Thermodynamics?
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Change in internal energy of a system equals heat added minus work done by the system, ΔU = Q – W
|
| 4154 |
What are the common phase changes?
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Melting, freezing, vaporization, condensation, sublimation
|
| 4155 |
What is latent heat?
-
Heat absorbed or released during a phase change without a change in temperature
|
| 4156 |
What is specific heat capacity?
-
Amount of heat required to raise the temperature of 1 kg of a substance by 1 K, c = Q/(mΔT)
|
| 4157 |
What is radiation?
-
Transfer of heat in the form of electromagnetic waves without the need for a medium
|
| 4158 |
What is convection?
-
Transfer of heat through the movement of fluid particles
|
| 4159 |
What is conduction?
-
Transfer of heat through a medium without the movement of the medium itself
|
| 4160 |
What is the SI unit of heat?
-
Joule (J)
|
| 4161 |
What is heat?
-
Energy transferred from one body to another due to temperature difference
|
| 4162 |
What are the common temperature scales?
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Celsius (°C), Fahrenheit (°F), and Kelvin (K)
|
| 4163 |
What is the SI unit of temperature?
-
Kelvin (K)
|
| 4164 |
What is temperature?
-
A measure of the average kinetic energy of the particles of a substance
|
| 4165 |
What is the role of plasma in daily life?
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Fluorescent lamps, plasma TVs, and fusion research
|
| 4166 |
How is relative density measured experimentally?
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Using a hydrometer or by comparing mass of equal volumes
|
| 4167 |
What is the difference between elastic and plastic deformation?
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Elastic returns to original shape; plastic causes permanent deformation
|
| 4168 |
Can solids also exhibit elasticity?
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Yes, as long as the stress is within the elastic limit
|
| 4169 |
How does viscosity affect fluid flow?
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Higher viscosity means slower flow and more resistance
|
| 4170 |
How does capillarity help plants?
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Draws water from roots to leaves through narrow xylem tubes
|
| 4171 |
How does surface tension affect liquid droplets?
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Causes them to form spherical shapes to minimize surface area
|
| 4172 |
What is the principle behind hydraulic lifts?
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Pascal’s Law, pressure applied at one point is transmitted to lift heavy loads
|
| 4173 |
What determines whether an object floats or sinks?
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Its density relative to the density of the fluid
|
| 4174 |
How does pressure vary with depth in a fluid?
-
Pressure increases with depth, P = P₀ + ρgh
|
| 4175 |
What is shear modulus?
-
Ratio of tangential stress to tangential strain
|