Class: 11th Subject:
Physics
Chapter: Thermodynamics Total Marks: 21
- A one liter flask contains some mercury. It is found that at different temperatures, the volume of air inside the flask remains the same. What is the volume of mercury in the flask? Given the co-efficient of linear expansion of glass = 9 × 10-6 / 0C and co-efficient of volume expansion of mercury = 1.8 × 10-4 / 0C. (2)
- The resistance of certain platinum resistance thermometer is found to be 2.56 Ω at 00C and 3.56 Ω at 1000C. When the thermometer is immersed in a given liquid, its resistance is observed to be 5.06 Ω. Determine the temperature of liquid? (2)
- A ball is dropped on a floor from a height of 2cm. After the
collision, it rises up to a height of 1.5m. Assuming that 40% of
mechanical energy lost goes to thermal energy into the ball. Calculate the
rise in temperature of the ball in the collision. Specific heat capacity
of the ball is 800J/K. Take g = 10m/s2 (2)
- What is critical temperature? How will you differentiate between a gas and a vapour depending on critical temperature? (2)
- A 50g lead bullet, specific heat 0.02 cal/g/0C is initially at 300C. It is fixed vertically upward
with a speed of 840m/s and on returning to the starting level strikes a cake
of ice at 00C.
How much ice is melted? Assume that all energy is spent in melting ice
only? (2)
- The tile floor feels colder than the wooden floor even though both
floor materials are at same temperature. Why? (2)
- How does second law of thermodynamics explain expansion of gas? (2)
- One kilogram molecule of a gas at 400K expands isothermally until
its volume is doubled. Find the amount of work done and heat produced? (2)
- Why does absolute zero not correspond to zero energy? (2)
- Calculate the work done during the isothermal Process? (3)
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