Carnot Cycle

Q. If a refrigerator's door is opened, then we get

1. No effect on room
2. Room cooled
3. More amount of heat is passed out
4. Room heated

Q.

What is a fusion tube? Is fusion tube same as test tube?

Q. A certain engine which operates in a Carnot cycle absorbs 3.347 kJ at ${400}^{\circ }C,$ how much work is done by the engine per cycle? The temperature of sink is ${100}^{\circ }C.$

1. 1.49 kJ
2. 2.98 kJ
3. 1.85 kJ
4. 2.51 kJ

Q. $\alpha ,v\text{and}u$ represent most probable velocity, average velocity and root mean square velocity of a gas at a particular temperature. Which one of the following relationship is correct?

1. $\alpha >u>v$
   
2. $v>u>\alpha$
   
3. $u>\alpha >v$
   
4. $u>v>\alpha$

Q.

The cooling in the refrigerator is due to?

1. The reaction of the refrigerator gas

2. Expansion of ice

3. The expansion of the gas in the refrigerator

4. The work of the compressor

Q. A carnot engine operating between temperature $T_1$ and $T_2$ has the efficiency of $\frac{1}{6}$. When the temperature $T_2$ is lowered by 62K, it efficiency becomes $\frac{1}{3}$, Then temperature $T_1$ and $T_2$ respectively are

1. $T_1=310K,T_2=248K$
2. $T_1=372K,T_2=310K$
3. $T_1=370K,T_2=330K$
4. $T_1=330K,T_2=268K$

Q.

The coefficient of expansion of mercury is less than that of glass

1. True
2. False

Q. Which of the following solution has maximumvapour pressure :(1) 1 N KNO(3) 1 N AL, (SO, ) (4) IN TiNO)(2) 1 N Ba(NO, )3/24 3374

Q.

List some advantages of the expansion of matter on heating.

Q. A system absorb 20KJ heat and does 10KJ work then internal energy of system will be (1) decreases by 10 kJ (2) increases by 10 KJ (3) decreases by 30 KJ (4) increases by 30 KJ

Q.

Which is the most efficient cycle?

Q. Carnot Cycle is a engine.

1. four stroke
2. two stroke
3. six stroke
4. eight stroke

Q. The limitation of the first law of Thermodynamics is that it cannot tell us the direction of the process.

1. True
2. False

Q. The efficiency of the Carnot engine is 1/6. On decreasing the temperature of the sink by 65K, the efficiency increases to 1/3. Find the temperature of the sink and the source respectively.

1. 325 K and 390 K
2. 320 K and 390K
3. 325 K and 395K
4. 320 K and 380 K

Q. A family consumes 12 kg of LPG in 30 days. Calculate the average energy consumed per day if the calorific value of LPG is 50 kJ/kg.

1. 10, 000 J/day
2. 15, 000 J/day
3. 20, 000 J/day
4. 25, 000 J/day

Q. A refrigerator causes cooling because

1. Work done by the gas is converted into heat
2. Heat of the gas is lost as work is done by the gas
3. Heat release by gas is spread over a larger space
4. None of the above

Q. A certain engine which operates in a Carnot cycle absorbs 3.347 kJ at ${400}^{\circ }C,$ how much work is done by the engine per cycle? The temperature of sink is ${100}^{\circ }C.$

1. 1.49 kJ
2. 2.51 kJ
3. 1.85 kJ
4. 2.98 kJ

Q. The efficiency of the Carnot engine is $1/6$. On decreasing the temperature of the sink by $65\text{K}$, the efficiency increases to $1/3$. Find the temperature of the source and the sink.

1. $T_1=496\text{K},T_2=325\text{K}$
2. $T_1=390\text{K},T_2=325\text{K}$
   
3. $T_1=390\text{K},T_2=425\text{K}$
4. $T_1=325\text{K},T_2=390\text{K}$

Q. The efficiency of the Carnot engine is 1/6. On decreasing the temperature of the sink by 65K, the efficiency increases to 1/3. Find the temperature of the sink and the source respectively.

1. 325 K and 390 K
2. 320 K and 390K
3. 320 K and 380 K
4. 325 K and 395K

Q. Carnot Cycle is a engine.

1. four stroke
2. two stroke
3. six stroke
4. eight stroke

Q. In the photoelectric effect, the slope of the straight-line graph between stopping potential (V${}_0$) and the frequency of incident light (v) gives :

1. charge on electron
2. work function of emitter
3. plank's constant
4. ratio of Planks's constant to charge on electron

Q. The cooling in refrigerator is due to

1. Reaction of the refrigerator gas
2. Expansion of ice

3. The expansion of the gas in the refrigerator

4. The work of the compressor

Q. A refrigerator causes cooling because

1. work done by the gas is converted into heat
2. heat of the gas is lost as work is done by the gas
3. heat released by gas is spread over a larger space
4. None of the above

Q. What is the coefficient of ${CO}_2$ in the given reaction?

1. 2
2. 10
3. 4
4. 8
5. 13

Q. 57 Assuming ideal gas cvm will be temprature independent for O3 N2 Co2 He

Q. The value of $K_w$ in $0.1MNaOH$ and $0.1MNaCl$ are

1. same
2. different
3. same only at ${25}^{o}C$
4. None of these

Q. What are the characteristics of entropy(s)?

Q. Why is entropy of the universe increasing ?

Q. The author uses the automobile (lines 45-46) to represent equations that.

1. Demand a professionals attention
2. Do not work together effectively
3. Are intrinsically unreliable
4. Can be easily adjusted if necessary
5. Are based on dated mathematics

Q. During an isothermal expansion of an ideal gas, its:

1. enthalpy reduces to zero
2. enthalpy decreases
3. internal energy remains unaffected
4. internal energy increases