Physics Test 119

Result

Physics Test 119

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Question 1
4 / -1

The variation of lengths of two metal rods A and B with change in temperature are shown in figure. The ratio of is

A
3/2

B
2/3

C
4/3

D
3/4
Question 2
4 / -1

The temperature (θ) versus heat transfer (Q) plot for two substances A and B is given in the figure. If some quantity of substance A in liquid phase at temperature 30°C is mixed with substance B at 20°C then the temperature of the mixture will be. (Given that boiling point for substance A is more than 30°C) (Assume no change in phase of both liquids)

A
22.5°C

B
27.5°C

C
25°C

D
20°C

Solution
Question 3
4 / -1

Three conducting rods of same material and cross-section are shown in figure. Temperatures of A, D and C are maintained at 20°C, 90°C and 0°C. The ratio of lengths of BD and BC if there is no heat flow in AB is :

A
2 / 7

B
7 / 2

C
9 / 2

D
2 / 9
Question 4
4 / -1

One mole of a diatomic gas undergoes a process where P₀, V₀ are constants. The translational kinetic energy of the gas when V = V₀ is given by :

A

B

C

D
Question 5
4 / -1

In which of following processes, net heat is absorbed by the gas (P = Pressure, V = Volume, T = Temperature, ρ = density)

A

B

C

D
All are correct

Solution

(A) W = +ve ΔU = +ve ⇒ Q = +ve

(B)

(C)
Question 6
4 / -1

Five moles of helium are mixed with two moles of hydrogen to form a mixture. Take molar mass of helium M₁ = 4g and that of hydrogen M₂ = 2g

A
The equivalent molar mass of the mixture is

B
The equivalent degree of freedom f of the mixture is 5

C
If the internal energy of He sample is 100J and that of the hydrogen sample is 200J, then the internal energy of the mixture is 300 J

D
All are correct

Solution
Question 7
4 / -1

Two moles of helium gas are taken over the cycle ABCDA, as shown in the P – T diagram.

(Use : ln2 = 0.7)

A
The work done by the gas from A to B is 600R

B
The work done by the gas from B to C is 840R

C
The net work done by the gas in the cycle ABCDA is 276R

D
option 1 and option 2 are correct

Solution
Question 8
4 / -1

Radius of a metallic rod varies with x (distance from end A) as r = (x + 1)^3/2 m. End A and B of rod are maintain at 100°C and 0°C respectively. Thermal conductivity and length of rod are 3/π W/m-K and 2 m respectively. Assume steady state flow of heat in rod and rod is covered with adiabatic coating :-

A
Rate of heat flow through the rod is 600 W

B
Temperature is approximately 15.6°C at x = 1 m

C
Ratio of thermal resistance of rod between (x = 0 & x = 1) and (x = 1 & x = 2) is 27/5

D
option 2 and option 3 are correct

Solution
Question 9
4 / -1

An Ideal gas sample is taken through process A → B → C → A. It absorb 360 J of Heat in A → B & rejects 56 J of Heat in C → A.

What is degree of freedom of gas ?

A
3

B
5

C
6

D
None of these
Question 10
4 / -1

An Ideal gas sample is taken through process A → B → C → A. It absorb 360 J of Heat in A → B & rejects 56 J of Heat in C → A.

What is heat rejected by Gas in process B → C ?

A
220 J

B
260 J

C
280 J

D
300 J

Solution