GK: Class 12 General Q&A · Page 117
3,658 free answers on GK (General) for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What is C in = mcΔt?
c (lowercase) represents specific heat capacity the amount of energy reuired to raise the temperature of 1 gram (or 1 kg) of a substance by 1°C. Different materials have different specific heat capacities: Water: 4.18 J/g°C (very high) Iron: 0.45 J/g°C Copper: 0.39 J/g°C Water's high specific heat capacity makes it excellent for temperature regulation.
- GeneralClass 12All
Is eual to C Delta T?
Almost the complete formula is = mcΔT. You can also write it as = CΔT, where capital C represents the total heat capacity (C = mc), combining mass and specific heat capacity into one value. This simplified version is useful when dealing with objects of known total heat capacity.
- GeneralClass 12All
What does mc ∆t stand for?
In the euation = mcΔt: = heat energy transferred (joules or calories) m = mass of the substance c = specific heat capacity (amount of energy needed to raise 1 gram by 1°C) Δt = change in temperature This euation calculates the thermal energy reuired to change a substance's temperature without changing its state.
- GeneralClass 12All
How to calculate temperature rise?
Temperature rise (ΔT) is calculated as: ΔT = Final Temperature - Initial Temperature If you know the heat added and want to find the temperature rise, rearrange = mcΔT to get: ΔT = /(mc), where is heat energy, m is mass, and c is specific heat capacity.
- GeneralClass 12All
What is the formula for MC Delta T?
The formula = mcΔT calculates heat energy transfer, where: = heat energy (joules or calories) m = mass of the substance (kg or g) c = specific heat capacity (J/g°C or cal/g°C) ΔT = temperature change (final temperature - initial temperature) This fundamental euation is used in chemistry, physics, and engineering to determine how much energy is needed to change a substance's temperature.
- GeneralClass 12All
What is 7 degrees temperature?
Without units, this is ambiguous: 7°C (44.6°F) is chilly but above freezing light jacket weather 7°F (-13.9°C) is very cold, well below freezing 7 K (-266.15°C) is extremely cold, near absolute zero Always specify the temperature scale for clarity.
- GeneralClass 12All
: Is 77 Fahrenheit hot?
77°F (25°C) is generally considered comfortable to slightly warm it's pleasant room temperature. Most people find this temperature comfortable for indoor spaces, though preferences vary based on humidity and personal comfort levels.
- GeneralClass 12All
: What is 1°C to 1°F?
A change of 1°C euals a change of 1.8°F (or 9/5°F). This means Celsius degrees are larger units—a 1-degree change on the Celsius scale represents a greater temperature difference than a 1-degree change on Fahrenheit.
- GeneralClass 12All
: Are 40°C and 40°F the same?
No, they're very different. 40°C euals 104°F (dangerously hot weather or high fever), while 40°F euals 4.4°C (cool but above freezing). The only temperature where Celsius and Fahrenheit are eual is -40° on both scales.
- GeneralClass 12All
: What is 22 in Fahrenheit?
22°C euals 71.6°F a mild, comfortable temperature. If you meant 22°F, that euals -5.6°C, which is below freezing.
- GeneralClass 12All
: Is 32 Celsius 100 Fahrenheit?
No, 32°C euals 89.6°F, not 100°F. Conversely, 100°F euals 37.8°C. The number 32 is significant in the opposite direction 32°F euals 0°C (water's freezing point).
- GeneralClass 12All
: How warm is 70°F in C?
70°F euals approximately 21.1°C. This is considered a comfortable indoor temperature for most people and represents mild, pleasant weather outdoors.
- GeneralClass 12All
What is 25°C and 373°C into Kelvin scale?
25°C = 298.15 K (approximately room temperature) 373°C = 646.15 K (very high temperature) Simply add 273.15 to any Celsius temperature to convert to Kelvin. Note that 373 K (not °C) is the boiling point of water.
- GeneralClass 12All
Which is warmer, 25°F or 25°C?
25°C is significantly warmer. 25°C euals 77°F (pleasant spring day), while 25°F euals -3.9°C (below freezing). Celsius degrees are larger than Fahrenheit degrees, and the scales have different zero points.
- GeneralClass 12All
What is 25 to 30°C in Fahrenheit?
25°C = 77°F (a comfortable room temperature) 30°C = 86°F (a warm day) To convert any temperature in this range, use the formula: °F = (°C × 1.8) + 32.
- GeneralClass 12All
What are the 4 types of temperature scales?
The four main temperature scales are: Celsius (°C) - Used globally, based on water's freezing (0°) and boiling (100°) points Fahrenheit (°F) - Commonly used in the U.S., freezing point at 32°, boiling at 212° Kelvin (K) - The SI unit, starts at absolute zero (-273.15°C) Rankine (°R) - Absolute scale using Fahrenheit-sized degrees, primarily used in e
- GeneralClass 12All
What is 32 in Celsius?
32°F euals 0°C. This is the freezing point of water at standard atmospheric pressure, making it one of the most important reference points in temperature conversion.
- GeneralClass 12All
What is the formula to find temperature?
Temperature itself isn't calculated by a single formula it's a measured property. However, you can convert between temperature scales using these formulas: Celsius to Fahrenheit: °F = (°C × 9/5) + 32 Fahrenheit to Celsius: °C = (°F - 32) × 5/9 Celsius to Kelvin: K = °C + 273.15
- GeneralClass 12All
How do you calculate C to F?
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8), then add 32. For example, 25°C = (25 × 9/5) + 32 = 77°F. This formula accounts for both the different size of the degrees and the different zero points on each scale.
- GeneralClass 12All
What is a Real Life Example of Snell's Law?
Several everyday examples include: Rainbow formation: Sunlight refracts when entering and exiting water droplets Eyeglasses: Lenses use refraction to correct vision Diamonds sparkling: Precise cuts create multiple refractions that maximize brilliance Fishing: Fish appear closer to the surface than they actually are Sunset colors: Atmospheric refraction be