Heat Thermodynamics Test

Result

Heat Thermodynamics Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

During the adiabatic expansion of 2 moles of a gas, the internal energy was found to have decreased by 100 J. The work done by the gas in this process is

A
zero

B
-100 J

C
200 J

D
100 J

Solution

dU = -100 J
dQ = dU + dW
dQ = 0 (Adiabatic process)
dW = -dU = +100 J
Question 2
1 / -0

For a diatomic gas, change in internal energy for a unit change in temperature for constant pressure and constant volume is U₁ and U₂, respectively. What is the ratio of U₁ to U₂?

A
5 : 3

B
3 : 5

C
1 : 1

D
5 : 7

Solution

In case of the diatomic gas the internal energy is given by U = 5/2 nRT
As the temperature of the both gases is same.
Hence U₁ : U₂ :: 1 : 1
Question 3
1 / -0

Find the actual mechanical advantage of a machine, which has a velocity ratio of 3.2 and efficiency 75%.

A
2.4

B
3.6

C
2.8

D
3.9

Solution

Ideal mechanical advantage (IMA) = Velocity ratio = 3.2 and Efficiency = Actual mechanical advantage (AMA) / Ideal mechanical advantage(IMA) => 75/100 = AMA / 3.2 ∴ AMA = 2.4