Kundali IQHome › Exam notes › Railway RRB › Heat & Temperature
Heat & Temperature
General Science · Physics
Useful for: Railway RRB, OSSC RHT — Regular High School Teacher, OSEPA Upper Primary — Science, OSSC Science, OSSSC Govt TGT Science — PCM, SSB Lecturer (Degree Colleges), SSB TGT PCM
Overview
Heat is energy in transit; temperature measures how hot a body is. Heat moves by conduction, convection and radiation.
Key points
- K = °C + 273; °F = (9/5)°C + 32.
- Specific heat: heat needed to raise 1 kg by 1 °C; water has a high specific heat.
- Latent heat is absorbed or released during a change of state without temperature change.
- Conduction (solids), convection (fluids), radiation (no medium needed).
- Water is densest at 4 °C (anomalous expansion).
Explanation
- Normal body temperature ≈ 37 °C = 98.6 °F.
- −40 is the same on the Celsius and Fahrenheit scales.
- Sea breeze blows from sea to land in the day due to convection.
- Dark surfaces absorb and emit radiation better.
Step by step
- Identify the concept or law involved.
- Recall the definition, unit or formula.
- Check units and the direction of the effect before choosing.
Examples
- 100 °C = 373 K.
- 37 °C = (9/5 × 37) + 32 = 98.6 °F.
- −40 °C = −40 °F.
Traps and advanced points
- Trap: Saying temperature rises during melting.
- Trap: Thinking radiation needs a medium.
- Trap: Adding 32 before multiplying.
Quick revision
- K = °C + 273.
- °F = 1.8°C + 32.
- Water densest at 4 °C.
Practice MCQs
Vitamin B1 deficiency causes what?
- Scurvy
- Beriberi
- Rickets
- Pellagra
Read chapter notes · Similar questions
Show answer
Answer: (b) Beriberi. Vitamin B1 deficiency causes Beriberi.
What is the main acid present in vinegar?
- Sulfuric acid
- Hydrochloric acid
- Citric acid
- Acetic acid
Read chapter notes · Similar questions
Show answer
Answer: (d) Acetic acid. Acetic acid is the main acid present in vinegar.
Which law is expressed as V = IR?
- Boyle’s law
- Hooke’s law
- Ohm’s law
- Snell’s law
Read chapter notes · Similar questions
Show answer
Answer: (c) Ohm’s law. Ohm’s law is expressed as V = IR.
Isotopes of an element have the same number of protons but different numbers of what?
- Atomic numbers
- Neutrons
- Protons
- Chemical symbols
Read chapter notes · Similar questions
Show answer
Answer: (b) Neutrons. Isotopes of an element have the same number of protons but different numbers of Neutrons.
Revision question: Light travels fastest in which of these?
- Vacuum
- Glass
- Air at sea level
- Water
Read chapter notes · Similar questions
Show answer
Answer: (a) Vacuum. Revision question: Light travels fastest in Vacuum.
The pH of human blood is approximately?
- 7.4
- 6.4
- 7.0
- 8.4
Read chapter notes · Similar questions
Show answer
Answer: (a) 7.4. Human blood is slightly alkaline, with pH about 7.35–7.45.
Which option correctly answers this General Science check: instrument used to measure electric current?
- ammeter
- force per unit area
- ohm
- H₂O
Read chapter notes · Similar questions
Show answer
Answer: (a) ammeter. An ammeter is connected in series.
Which blood group is known as the universal donor?
- O negative
- B negative
- A positive
- AB positive
Read chapter notes · Similar questions
Show answer
Answer: (a) O negative. O negative red cells can be given to patients of any ABO/Rh group in emergencies; AB positive is the universal recipient.
100 °C in kelvin is —
- 273 K
- 373 K
- 473 K
- 173 K
Read chapter notes · Similar questions
Show answer
Answer: (b) 373 K. 100 + 273.
0 °C in Fahrenheit is —
- 32 °F
- 100 °F
- 212 °F
- 0 °F
Read chapter notes · Similar questions
Show answer
Answer: (a) 32 °F. °F = (9/5)°C + 32.
More topics in this chapter
Notes and questions are written by Kundali IQ for practice. They are not official papers; always check the latest official notification for the syllabus and pattern.