MCQOPTIONS
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MCQOPTIONS
This section includes 47 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which one of the following is used as a moderator in the nuclear reactor ? |
| A. | Thorium |
| B. | Graphite |
| C. | Radium |
| D. | Ordinary water |
| Answer» C. Radium | |
| 2. |
A gas which burns with blue flame is ? |
| A. | CO |
| B. | O |
| C. | N |
| D. | CO |
| Answer» E. | |
| 3. |
For the process CO2 (s) CO2 (g) |
| A. | Both H and S are positive |
| B. | H is negative and S is positive |
| C. | H is positive and S is negative |
| D. | Both H and S are negative |
| Answer» B. H is negative and S is positive | |
| 4. |
The molar heat capacity of water is |
| A. | 4.184 JK |
| B. | 75.3 JK |
| C. | 185 JK |
| D. | 1 JK |
| Answer» C. 185 JK | |
| 5. |
Vibrational energy can be said as |
| A. | only potential |
| B. | only kinetic |
| C. | (a) & (b) both partially |
| D. | None of these |
| Answer» D. None of these | |
| 6. |
The law of Lavoisier and Laplace illustrates |
| A. | The principle of conservation |
| B. | Equivalence of mechanical and thermal energy |
| C. | The principle of conservation of matter |
| D. | Equivalence of mechanical and chemical energy |
| Answer» B. Equivalence of mechanical and thermal energy | |
| 7. |
A mixture of carbon monoxide and nitrogen is called |
| A. | Natural gas |
| B. | Water gas |
| C. | Producer gas |
| D. | None |
| Answer» D. None | |
| 8. |
During isothermal expansion of an ideal gas, its |
| A. | Internal energy increases |
| B. | Enthalpy decreases |
| C. | Enthalpy remains unaffected |
| D. | Enthalpy reduces to zero |
| Answer» D. Enthalpy reduces to zero | |
| 9. |
For an endothermic reaction to be spontaneous |
| A. | S must be positive |
| B. | S must be negative |
| C. | S must be zero |
| D. | G must be positive |
| Answer» B. S must be negative | |
| 10. |
An ideal fuel should have |
| A. | High calorific value |
| B. | Low ignition temperature |
| C. | Regulated and controlled |
| D. | All of the above |
| Answer» E. | |
| 11. |
For the process CO |
| A. | Both H and S are positive |
| B. | H is negative and S is positive |
| C. | H is positive and S is negative |
| D. | Both H and S are negative |
| Answer» B. H is negative and S is positive | |
| 12. |
A mixture of carbon monoxide and hydrogen is called |
| A. | Producer gas |
| B. | Water gas |
| C. | Natural gas |
| D. | None |
| Answer» C. Natural gas | |
| 13. |
In which of the following, the entropy decreases ? |
| A. | Crystallisation of sucrose from solution |
| B. | Rusting of iron |
| C. | Melting of ice |
| D. | Vaporization of comphor |
| Answer» B. Rusting of iron | |
| 14. |
Which law of thermodynamics introduces the concept of entropy ? |
| A. | First law |
| B. | Zeroth law |
| C. | Third law |
| D. | Second law |
| Answer» E. | |
| 15. |
For which one of the following elements, the standard enthalpy is not zero ? |
| A. | C (Diamond) |
| B. | C (Graphic) |
| C. | Liquid mercury |
| D. | Rhombic sulpur |
| Answer» B. C (Graphic) | |
| 16. |
In which type of coal percentage of carbon is the highest ? |
| A. | Peat |
| B. | Lignite |
| C. | Bituminous |
| D. | Anthracite |
| Answer» E. | |
| 17. |
When ice melts into water, which type of change occurs in entropy ? |
| A. | increases |
| B. | decreases |
| C. | becomes zero |
| D. | remains unchanged |
| Answer» B. decreases | |
| 18. |
Which one of the following has maximum colorific value ? |
| A. | Water gas |
| B. | Producer gas |
| C. | Oil gas |
| D. | Coal gas |
| Answer» D. Coal gas | |
| 19. |
The ratio of for inert gases is |
| A. | 1.33 |
| B. | 1.66 |
| C. | 2.13 |
| D. | 1.99 |
| Answer» C. 2.13 | |
| 20. |
When ammonium chloride is dissolved in water, the solution becomes cold. The change is |
| A. | Endothermic |
| B. | Exothermic |
| C. | Supercooling |
| D. | None of these |
| Answer» B. Exothermic | |
| 21. |
Entropy change of a system and its surroundings in equilibrium |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Either increases of decreases |
| Answer» D. Either increases of decreases | |
| 22. |
The compound with negative heat of formation is known as |
| A. | Endothermic conpound |
| B. | Exothermic compound |
| C. | Ecdoergonic compound |
| D. | None of the above |
| Answer» C. Ecdoergonic compound | |
| 23. |
According to latests sign conventions, the correct expression representing the first law of thermodynamics |
| A. | U = q + w |
| B. | U = H + pV |
| C. | U = q - w |
| D. | All the ecpressions are correct |
| Answer» B. U = H + pV | |
| 24. |
If system A is in thermal equilibrium with B and B is in thermal equilibrium with C, then A and C are in equilibrium with each other. "This is a statement of |
| A. | Cyclic rute |
| B. | Zeroth law of thermodynamics |
| C. | First law of thermodynamics |
| D. | Second law of thermodynamics |
| Answer» C. First law of thermodynamics | |
| 25. |
A substance that can supply energy either along or by reacting with another substance is known as |
| A. | Rayon |
| B. | Fibres |
| C. | Fuels |
| D. | Thiokol |
| Answer» D. Thiokol | |
| 26. |
Octane number of fuel can be increased by |
| A. | Isomerisaiton |
| B. | Alkylation |
| C. | Reforming |
| D. | All of these |
| Answer» E. | |
| 27. |
Which among the following is an extensive property of the system |
| A. | Temperature |
| B. | Volume |
| C. | Refractive index |
| D. | Viscosity |
| Answer» C. Refractive index | |
| 28. |
A gas expands isothermally and reversible. The work done by the gas is |
| A. | Zero |
| B. | Maximum |
| C. | Minimum |
| D. | Cannot be determined |
| Answer» C. Minimum | |
| 29. |
During isothermal expansion of an ideal gas, its internal energy |
| A. | decreases |
| B. | increases |
| C. | may increase or decrease |
| D. | remains unchanged |
| Answer» E. | |
| 30. |
Which of the following is a closed system ? |
| A. | Jet engine |
| B. | Tea placed in steel kettle |
| C. | Pressure cooker |
| D. | Rocket engine during propulsion |
| Answer» C. Pressure cooker | |
| 31. |
The information not conveyed by thermodynamics is about |
| A. | spontaneity of a reaction |
| B. | yields of the products formed |
| C. | rates of reactions |
| D. | all the three above |
| Answer» D. all the three above | |
| 32. |
The standard heat of formation of diamond is |
| A. | Same as that of graphite |
| B. | Greater than of graphite |
| C. | Less than that of graphite |
| D. | taken as zero |
| Answer» C. Less than that of graphite | |
| 33. |
The calorific value of fat is |
| A. | less than that of carbohydrates and protein |
| B. | less than that of protein but more than carbohydrates |
| C. | less than that of carbohydrate but more than that of protein |
| D. | more than that of carbohydrate and protein |
| Answer» E. | |
| 34. |
What happens when the door of a refrigerator is kept open ? |
| A. | Room cooled |
| B. | Room heated |
| C. | Room chilled |
| D. | None of these |
| Answer» C. Room chilled | |
| 35. |
Born-Haber cycle is used to determine |
| A. | Electronegativity |
| B. | Lattice energy |
| C. | Both |
| D. | None |
| Answer» C. Both | |
| 36. |
The second law of thermodynamics introduced the concept of |
| A. | Electrical energy |
| B. | Entropy |
| C. | Thermal energy |
| D. | None of these |
| Answer» C. Thermal energy | |
| 37. |
In any natural process |
| A. | The entropy of universe remains constant |
| B. | The entropy of universe tends towards maximum |
| C. | The entropy of universe towards minimum |
| D. | Any of the above can happen |
| Answer» C. The entropy of universe towards minimum | |
| 38. |
If a refrigerator's door is kept open, then |
| A. | room will be cooled |
| B. | room will be heated |
| C. | may get cooled or heated depending upon the weather |
| D. | no effect on room |
| Answer» C. may get cooled or heated depending upon the weather | |
| 39. |
A system which can exchange energy with the surrondings but no matter is called |
| A. | a heterogeneous system |
| B. | an open system |
| C. | a closed system |
| D. | an isolated system |
| Answer» D. an isolated system | |
| 40. |
Which has maximum calorific value ? |
| A. | Fat |
| B. | Protein |
| C. | Carbohydrate |
| D. | Amino acid |
| Answer» B. Protein | |
| 41. |
Which fuel has the maximum calorific value ? |
| A. | Charcoal |
| B. | Kerosene |
| C. | Wood |
| D. | Cow-dung |
| Answer» C. Wood | |
| 42. |
The standard state in chemical energetics implies |
| A. | 1 atm pressure at 273 K |
| B. | 1 atm pressure at 297 K |
| C. | 1 bar pressure at 298 K |
| D. | 1 bar pressure at specified temperature |
| Answer» E. | |
| 43. |
An intensive property in thermodynamics means a property which depends |
| A. | on the amount of the substance only |
| B. | on the nature of the substance only |
| C. | both on the amount as well as nature of the substance |
| D. | neither on the amount nor on the nature |
| Answer» C. both on the amount as well as nature of the substance | |
| 44. |
The order of apperance of the following with increasing temperature during the refining of crude oil is |
| A. | Kerosene, gasoline, diesel |
| B. | Diesel, kerosene, diesel |
| C. | Gasoline, kerosene, diesel |
| D. | Gasoline, diesel, kerosene |
| Answer» D. Gasoline, diesel, kerosene | |
| 45. |
The efficiency of a heat engine is maximum when |
| A. | temperature of source is greater than that of sink |
| B. | temperature of sink is greater than that of source |
| C. | temperature difference of source and sink is minimum |
| D. | temperature difference of source and sink is maximum |
| Answer» E. | |
| 46. |
During the evaporation of a liquid |
| A. | the enthalpy decreases |
| B. | the enthalpy increases |
| C. | the enthalpy remains unchanged |
| D. | the internal energy decreases |
| Answer» C. the enthalpy remains unchanged | |
| 47. |
Which one of the following is used as a |
| A. | Thorium |
| B. | Graphite |
| C. | Radium |
| D. | Ordinary water |
| Answer» C. Radium | |