10th Samacheer Quiz

Q1. Which statement is most directly related to Unit 3: Thermal Physics?

Heat Cell wall Gravity Photosynthesis

Q2. A gas has volume 2 L at 3 atm. If pressure falls to 1 atm at constant temperature, what is the new volume?

6 L 2/3 L 1 L 3 L

Q3. Charles’ law relates:

Volume and absolute temperature Pressure and mass Mass and time Force and distance

Q4. Why do overhead electric wires sag more in summer?

They expand due to heat They cool Their mass increases Current becomes zero

Q5. Which equation represents Charles’ law?

V₁/T₁ = V₂/T₂ P₁V₁ = P₂V₂ P/T = constant Q = mcΔT

Q6. Why does food cook faster in a pressure cooker?

Pressure raises the boiling point of water Pressure lowers the boiling point No heat is needed Water mass becomes zero

Q7. What is the equation for latent heat?

Q = mL Q = mcΔT Q = m/L Q = m+c

Q8. What is 27°C in kelvin?

300 K 246 K 273 K 310 K

Q9. How much heat is needed to raise 2 kg of water by 10°C? c = 4200 J kg⁻¹ K⁻¹

84,000 J 8,400 J 42,000 J 4,200 J

Q10. Which relation converts Celsius temperature to Kelvin?

K = °C + 273 K = °C − 273 K = 273/°C K = 9°C/5