Q6. A steel plate has an area of \( 1.2 \, \text{m}^2 \) at \( 45^\circ \text{C} \). What is the decrease in area when cooled to \( 5^\circ \text{C} \)? (\( \alpha_l = 1.2 \times 10^{-5} \, \text{K}^{-1} \))A. 0.0011 m²B. 0.0012 m²C. 0.00115 m²D. 0.001152 m²
Q7. Which material is preferred as a coolant in radiators due to its high capacity to absorb heat?A. AlcoholB. WaterC. MercuryD. Oil
Q8. How much heat is required to raise \( 0.5 \, \text{kg} \) of water from \( 20^\circ \text{C} \) to \( 80^\circ \text{C} \) and then convert \( 0.2 \, \text{kg} \) of it to steam at \( 100^\circ \text{C} \)? (Specific heat of water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \), latent heat of vaporization = \( 2.256 \times 10^6 \, \text{J kg}^{-1} \))A. 615 kJB. 618.64 kJC. 620 kJD. 610 kJ
Q9. A gas at \( 300 \, \text{K} \) and \( 1 \, \text{atm} \) occupies \( 3 \, \text{L} \). If it is heated to \( 450 \, \text{K} \) while the volume is adjusted to \( 4.5 \, \text{L} \), what is the final pressure?A. 0.9 atmB. 1.1 atmC. 1 atmD. 1.2 atm
Q10. A gas at \( 2.8 \, \text{atm} \) and \( 97^\circ \text{C} \) occupies \( 3.8 \, \text{L} \). If the temperature is raised to \( 147^\circ \text{C} \) and volume reduced to \( 2.5 \, \text{L} \), what is the final pressure?A. 4.8 atmB. 4.9 atmC. 4.83 atmD. 4.7 atm
Q1.Which property of a material explains why sand heats up faster than water under the same sunlight?A.Specific heat capacityB.Latent heatC.DensityD.Thermal expansion
Q2.A copper cylinder has a volume of 500 cm3500 \, \text{cm}^3500cm3 at 50∘C50^\circ \text{C}50∘C. What temperature must it be cooled to for the volume to decrease by 0.85 cm30.85 \, \text{cm}^30.85cm3? (αl=1.7×10−5 K−1\alpha_l = 1.7 \times 10^{-5} \, \text{K}^{-1}αl=1.7×10−5K−1)A.16°CB.17°CC.16.5°CD.16.7°C
Q3.Which scale measures temperature relative to the freezing and boiling points of water with 180 intervals between them?A.KelvinB.CelsiusC.FahrenheitD.Centigrade
Q4.What is the primary factor affecting the volume expansion of a gas compared to solids and liquids?A.DensityB.Specific heatC.PressureD.Coefficient of volume expansion
Q5.A 0.45 kg0.45 \, \text{kg}0.45kg copper block at 200∘C200^\circ \text{C}200∘C is placed in 1.1 kg1.1 \, \text{kg}1.1kg water at 23∘C23^\circ \text{C}23∘C in a 0.2 kg0.2 \, \text{kg}0.2kg brass calorimeter at 23∘C23^\circ \text{C} 23∘C. What is the final temperature? (Specific heat of copper = 386 J kg−1K−1386 \, \text{J kg}^{-1} \text{K}^{-1} 386J kg−1K−1, water = 4186 J kg−1K−14186 \, \text{J kg}^{-1} \text{K}^{-1}4186J kg−1K−1, brass = 386 J kg−1K−1386 \, \text{J kg}^{-1} \text{K}^{-1}386J kg−1K−1)A.29.3°CB.29°CC.30°CD.28°C