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11th Physics Weekly Test - 1 ( Heat and Thermodynamics )

MABS Institution

11th Physics Weekly Test - 1 ( Heat and Thermodynamics )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

First law of thermodynamics corresponds to

conservation of energy
heat flow from hotter to cooler body
law of conservation of angular momentum
Newton's law of cooling

C_v & C_P denote the molar specific heat capacities of a gas at constant volume and constant pressure then

C_p - C_v is larger for a diatomic ideal gas than for a monoatomic ideal gas
C_p, + C_v is larger for a diatomic ideal gas than for a monoatomic ideal gas
C_p, / C_v is larger for a diatomic ideal gas than for a monoatomic ideal gas
C_p, x C_v is lesser for a diatomic ideal gas than for a monoatomic ideal gas

In an adiabatic system which is true?

\({ P }^{ \gamma }{ T }^{ \gamma -1 }\) = Constant
\({ P }^{ \gamma }{ T }^{ 1-\gamma }\) = Constant
\({ PT }^{ \gamma }\) = Constant
\({ P }^{ 1-\gamma }{ T }^{ \gamma }\) = Constant

A carnot engine takes heat from a reservoir at 627°C and rejects heat to a sink at 27°C. Its efficiency is

3/5
1/3
2/3
200/209

In an isothermal process

there is no change in internal energy
there is no change in temperature
there is no change in enthalpy
all the above

An ideal gas heat engine operators in a carnot's cycle between 227°C and 127°C. It absorbs 6 x 10⁴J at high temperature. The amount of heat converted into work is ________.

2.4 x 10⁴J
4.8 x 10⁴J
1.2 x 10⁴J
6 x 10⁴J

the given (V- T) diagram, what is the relation between pressures P₁ and P₂?

P₁=P₂
P₁>P₂
P₁<P₂
cannot be predicted

The difference between volume and pressure coefficients of an ideal gas is ___________

\(\frac{1}{273}\)
273
\(\frac{2}{273}\)
zero

The graph between volume and temperature in Charles’ law is

an ellipse
a circle
a straight line
a parabola

A hot cup of coff ee is kept on the table. Aft er some time it attains a thermal equilibrium with the surroundings. By considering the air molecules in the room as a thermodynamic system, which of the following is true

ΔU > 0, Q = 0
ΔU > 0, W < 0
ΔU > 0, Q > 0
ΔU = 0, Q > 0

Part - B

Generic 2 - Answer All Question

What is Thermodynamics?

Apply first law for (a) an isothermal (b) adiabatic (c) isobaric processes.

A carnot engine, having efficiency of \(\eta =\cfrac { 1 }{ 10 } \) as heat engine, is used as a refrigerator. If the work done on the system is 10 J, then find the amount of energy absorbed from the reservoir at lower temperature.
What are the different types of thermodynamic systems?

Define one mole.

Part - C

Generic 3 - Answer All Question

Describe some applications of thermal conversion.

Write the main features of the prevost theory?

If I is the moment of inertia of a distance about an axis passing through its centre, the find the change in moment of inertia due to small change in its temperature \(\triangle\)t \(\alpha\) is the Coefficient of linear expansion of distance.

When 0.45 kg of ice of 0°Cmixed with 0.9 kg of water at 55°C in a container, the resulting temperature is 10°C. Calculate the heat of fusion of ice.
Draw and explain the distribution of radiation intensity.

Part - D

Generic 5 - Answer All Question

Derive the work done in an isothermal process.

Explain Wien’s law and why our eyes are sensitive only to visible rays?

Explain Calorimetry and derive an expression for final temperature when two thermodynamic systems are mixed.

Eiffel tower is made up of iron and its height is roughly 300 m. During winter season (January) in France the temperature is 2°C and in hot summer its average temperature 25°C. Calculate the change in height of Eiffel tower between summer and winter. The linear thermal expansion coefficient for iron α = 10 ×10-⁶per °C.
Distinguish between isothermal and adiabatlc process.

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