Assertion: When a bottle of cold carbonated drink is op

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

171.

Assertion:  When a glass of hot milk is placed in a room and allowed to cool, its entropy decreases. 

Reason:  Allowing hot object to cool does not violate the second law of thermodynamics.

  • If both assertion and reason are true and reason is the correct explanation of the assertion

  • If both assertion and reason are true but reason is not the correct explanation of the assertion

  • If assertion is true, but reason is false

  • Both assertion and reason are false statement


172.

Assertion: Reversible systems are difficult to find in real world. 

Reason : Most processes are dissipative in nature.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


173.

Assertion: Air quickly leaking out of a balloon becomes cooler

Reason: The leaking air undergoes adiabatic expansion

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


174.

Assertion:  In pressure-temperature (P-T) phase diagram of water, the slope of the melting curve is found to be negative. 

Reason:  Ice contracts on melting to water

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


Advertisement
175.

N  moles of a monoatomic gas is carried round the reversible rectangular cycle ABCDA as shown in the diagram. The temperature at A  is To. The thermodynamic efficiency of the cycle is

    

  • 15 %

  • 50 %

  • 20 %

  • 25 %


176.

Assertion: Thermodynamic process in nature are irreversible.

Reason: Dissipative effects cannot be eliminated.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


Advertisement

177.

Assertion: When a bottle of cold carbonated drink is opened, a slight fog forms around the opening. 

Reason:  Adiabatic expansion of the gas causes lowering of temperature and condensation of water vapours.

  • if both assertion and reason are true and the reason is the correct explanation of the assertion.

  • if both assertion and reason are true and the reason is not  the correct explanation  of the assertion.

  • if assertion is true but reason is false

  • if both assertion and reason are false statements


A.

if both assertion and reason are true and the reason is the correct explanation of the assertion.

Cold drinks are produced by injecting carbon dioxide into the drink at several atmospheres. Carbon dioxide dissolves readily even at normal atmospheric pressure. When the pressure is released (that is bottle is opened) carbon dioxide comes out of solution forming numerous bubbles and releasing the carbon dioxide back into the atmosphere. Also, in. "this process no heat is lost or gained, hence it is an adiabatic expansion.


Advertisement
178.

The density of a substance  at  0°C  is 10 g/cc and at  100° C, its density is  9.7  g/cc. The coefficient of linear expansion of the substance is

  • 10-4

  • 102

  • 10-3

  • 102


Advertisement
179.

The latent heat of vapourisation of water is  2240. If the work done in the process of vapourisation of 1 g is 168 J, then increase in internal energy is

  • 2408 J

  • 2072 J

  • 2240 J

  • 1904 J


180.

An engine is working. It takes 100 calories of heat from source and leaves 80 calories of heat to sink. If the temperature of source is 127°C, then temperature of sink is

  • 147°C

  • 47°C

  • 100°C

  • 47 K


Advertisement