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11th Physics Monthly Test - 2 ( Heat and Thermodynamics )

MABS Institution

11th Physics Monthly Test - 2 ( Heat and Thermodynamics )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The coefficient of volume expansion of a solid is x times the coefficient of superficial. expansion. Then x is

1.5
2
2.5
3

An iron tyre is to be fitted on a wooden wheel O.lm in diameter. The diameter of the tyre is 6 mm smaller than that of the wheel. The tyre should be heated by a temperature of (coefficient of volume expansion of iron is 3.6 x 10^-5/°C) ________

167°C
334°C
500^oC
1000^oC

For a certain gas the ratio of specific heats is given to be y = 1.5. For this gas __________.

C_v = 3R
C_p= 3R
C_v= 5R
C_p= 5R

One kg of a diatomic gas is at a pressure of 8 x 10⁴ Nm^-2 the density of the gas is 4kglm^g What is the energy of the gas due to its thermal mole

3 x 10⁴ J
5. x 10⁴ J
6 x 10⁴ J
7 x 10⁴ J

In an isochoric process, we have

W = 0
Q = 0
ΔU = 0
ΔT = 0

The mechanical equivalent of heat J is:

a constant
a physical quantity
a conversion factor
none of the above

Graph of specific heat at constant volume for a mono atomic gas is

A gas receives an amount of heat equal to 110 joules and performs 40 joules of work. The change in the internal energy of the gas is _______.

70 J
150 J
110 J
40 J

A closed bottle containing water at room temperature is taken to the moon and then the lid is opened. The water will______.

freeze
boil
decompose into hydrogen and oxygen
not change at all.

The absolute zero temperature is transmission as

273 K
-273 K
-273⁰ C
273⁰C

Part - B

Generic 2 - Answer All Question

What is meant by 'chemical equilibrium'?

‘An object contains more heat’- is it a right statement? If not why?

State Clausius form of the second law of thermodynamics

What is a isochoric process?
In the planet Mars, the average temperature is around -53°C and atmospheric pressure is 0.9 kPa. Calculate the number of moles of the molecules in unit volume in the planet Mars? Is this greater than that in earth?

What is meant by Radiation? Give example.

Can we measure the temperature of the object by touching it?

Part - C

Generic 3 - Answer All Question

A cylinder with a movable piston contains 3 moles of hydrogen at constant temperature and pressure. The walls of. a cylinder are made up of a heat insulator, and the piston is insulated by having a pile of sand on it. By what factor does the pressure of a gas increases if the gas is compressed to half its original volume?

Refrigerator is to maintain eatables kept inside at 9°C. If room temperature is 36°C. Calculate the co efficient of performance.

The temperature - entropy diagram of a reversible engine cycle is given in figure. Calculate its efficiency.

Write the important properties of thermal radiations.

How does the internal energy of a thermodynamic system change?
Calculate the heat required to convert 0.6 kg of ice at - 20°C, kept in a calorimeter to steam at 100°C atmospheric pressure, Given the specific heat capacity (L_ice) of lee= 2100 Jkg^-1K^-1.

Describe an analytical method for determining the work done during the expansion of gas.

Part - D

Generic 5 - Answer All Question

The PV diagrams for a thermodynamical system is given in the figure below. Calculate the total work done in each of the cyclic processes shown.

Explain the isobaric process and derive the work done in this process

Explain Joule’s Experiment of the mechanical equivalent of heat.

Give some examples of irreversible processes.

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

A gas expands from volume 1m³to 2m³ at constant atmospheric pressure.
(a) Calculate the work done by the gas.
(b) Represent the work done in PV diagram

Distinguish between isothermal and adiabatlc process.

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