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Hassan
1.The thermal capacity of 40g of aluminium (specific heat = 0.2 cal°g-1 C-1) is?
A. 40cal°C-1
B. 160 cal°C-1
C. 200 cal°C-1
D. 40cal°C-1
2.80g of water at 30°C is poured on a large block of ice which is at 0°C. The mass of ice that melts is?
A. 30g
B. 80g
C. 150g
D. 30g
3.At which temperature, the centigrade and Fahrenheit scales are equally?
A. 40°
B. -40°
C. 37°
D. 40°
4.The volume of a gas at 20°C is 100cm3 at normal pressure. If it is heated to 100°C, its volume becomes 125cm3 at the same pressure, then volume coefficients of the gas (at normal pressure) is?
A. 0.0033/°C
B. 0.0025/°C
C. 0.0030/°C
D. 0.0033/°C
5.Density of substance at 0°C is g/cc and 100°C, its density is 9.7g/cc. The coefficient of linear expansion of the substance is?
A. 10-1
B. 10-2
C. 10-3
D. 10-1
6.Amount of heat required to raise the temperature of a body through 1K is called?
A. Specific heat
B. Thermal capacity
C. Water equivalent
D. Specific heat
7.If the temperature of a rod is increased by 10°C, its length increases by 1%. What is the percentage change in volume of the body of the same material for 10°C increase in temperature?
A. 9%
B. 1%
C. 5%
D. 9%
8.In order that the heat flows from one part of a solid to another part, what is required?
A. Uniform density
B. Temperature gradient
C. Density gradient
D. Uniform density
9.Mud houses are cooler in summer and warmer in winter because?
A. Mud is a good conductor of heat
B. Mud is a superconductor of heat
C. Mud is a bad conductor of heat
D. Mud is a good conductor of heat
10.A perfectly black body is one whose?
A. Absorptive power is 1
B. Absorptive power is 0
C. Emissive power is 1
D. Absorptive power is 1
11. A black body at 200 K is found to emit maximum energy at a wavelength 14μm. When its temperature is raised to 1000K, then wavelength at which maximum energy emitted it?
A. 14mm
B. 7μm
C. 2.8μm
D. 14mm
12.The triple point of water is?
A. 273.16°C
B. 273.16K
C. 273.16°F
D. 273.16°C
13.During constant temperature, we feel colder on the day when the humidity is?
A. 85%
B. 40%
C. 60%
D. 85%
14.A system, after passing through different states returns back to its original state, is called?
A. Cyclic process
B. Isothermal process
C. Adiabatic process
D. Cyclic process
15.Which of the following parameters does not characterize the thermodynamic state of matter?
A. Temperature
B. Pressure
C. Work
D. Temperature
16.Calculate the work done if temperature is changes from 0°C to 200°C at one atmosphere.
A. 100 cal
B. 200 cal
C. 400 cal
D. 100 cal
17.Which of the following is not a state function?
A. Work done at constant pressure
B. Enthalpy
C. Work done by conservative force
D. Work done at constant pressure
18.The door of a domestic refrigerator is kept open while the switch is on. Then the room will?
A. Get heated
B. Ger neither heated nor cooled
C. Gets cooled
D. Get heated
19.A Carnot engine working between 300 K and 600 K has a work output of 800 J per cycle. The amount of heat energy supplied to the engine from source per cycle is?
A. 1200J
B. 1600J
C. 2400J
D. 1200J
20.Heat capacity of a substance is infinite. It means?
A. Heat is given out
B. Heat is taken out
C. No change in temperature
D. Heat is given out
21.In a given process of an ideal gas, dW=0 and the dQ<0. Then for the gas?
A. The temperature will decreases
B. The temperature will increase
C. The pressure will remain constant
D. The temperature will decreases
22.The temperature of reservoir of Carnot’s engine operating with an efficiency of 70% is 1000K. What is the temperature of source?
A. 300K
B. 400K
C. 500K
D. 300K
23.The temperature of sink of Carnot engine is 27°C. Efficiency is 25%. Then?
A. 227°C
B. 327°C
C. 127°C
D. 227°C
24.The freezer in a refrigerator is located at the top section so that?
A. The entire chamber of the refrigerator is cooled quickly due to convection
B. The motor is not heated
C. The heat gained from the environment is high
D. The entire chamber of the refrigerator is cooled quickly due to convection
25.Which of the following is not a thermodynamics co-ordinate?
A. P
B. T
C. V
D. P
26.A perfect gas is contained in a cylinder kept in vacuum. If the cylinder suddenly bursts, then the temperature of the gas?
A. Becomes zero K
B. Is decreased
C. In increased
D. Becomes zero K
27.The increase in internal energy of a system is equal to the work done in the system. Which process does the system undergo?
A. Isochoric
B. Adiabatic
C. Isobaric
D. Isochoric
28.If the temperature of the source is increased, the efficiency of a Carnot engine?
A. Increases
B. Decreases
C. Remains constant
D. Increases
29.The efficiency of Carnot’s engine operating between reservoirs, maintained at temperature 27°C and -123°C is?
A. 50%
B. 24%
C. 0.75%
D. 50%
30.The temperature of sink of Carnot’s engine is 27°C. If the efficiency of the engine is 25%, then the temperature of source must be?
A. 27°C
B. 127°C
C. 227°C
D. 27°C
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