MCQOPTIONS
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MCQOPTIONS
This section includes 51 Mcqs, each offering curated multiple-choice questions to sharpen your SRMJEEE knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
At constant temperature, when pressure is decreased average kinetic energy of gas molecules |
| A. | decreases |
| B. | remains unchanged |
| C. | decreases |
| D. | becomes two fold |
| Answer» C. decreases | |
| 2. |
Force exerted by a gas on unit area of container is called |
| A. | effusion |
| B. | diffusion |
| C. | mobility |
| D. | pressure |
| Answer» E. | |
| 3. |
Escape of gas molecules from a small hole one after other is called |
| A. | diffusion |
| B. | effusion |
| C. | concentration |
| D. | mobility |
| Answer» C. concentration | |
| 4. |
An ordered, repeating three dimensional arrangement of particles makes up a |
| A. | crystalline solid |
| B. | amorphous solid |
| C. | can be both A and B |
| D. | none of above |
| Answer» B. amorphous solid | |
| 5. |
If temperature of any gas is increased its volume |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of above |
| Answer» B. decreases | |
| 6. |
In pressure cooker pressure applied is |
| A. | 1 atm |
| B. | 2 atm |
| C. | 3 atm |
| D. | 4 atm |
| Answer» C. 3 atm | |
| 7. |
Boiling point is temperature at which |
| A. | vapor pressure is more than external pressure |
| B. | Vapor pressure is less than external pressure |
| C. | Vapor pressure is not related to external pressure |
| D. | Vapor pressure is equal to external pressure |
| Answer» E. | |
| 8. |
On applying pressure volume of gas |
| A. | increases |
| B. | remains same |
| C. | becomes double |
| D. | decreases |
| Answer» E. | |
| 9. |
Position of liquid molecules are |
| A. | fixed |
| B. | not fixed |
| C. | not sliding |
| D. | none of above |
| Answer» C. not sliding | |
| 10. |
As molecular mass of gasses increases their density |
| A. | decreases |
| B. | increases |
| C. | remains unchanged |
| D. | none of above |
| Answer» B. increases | |
| 11. |
In graphite carbon atoms are arranged in layers of |
| A. | pentagonal arrays |
| B. | heptagonal arrays |
| C. | octagonal arrays |
| D. | hexagonal arrays |
| Answer» E. | |
| 12. |
1 atmospheric pressure is equal to |
| A. | 100.345 Pa |
| B. | 760 kPa |
| C. | 101.325 kPa |
| D. | 1.01325 mmHg |
| Answer» D. 1.01325 mmHg | |
| 13. |
Process in which vapor molecules are recaptured by molecules at liquid surface is called |
| A. | evaporation |
| B. | sublimation |
| C. | condensation |
| D. | boiling |
| Answer» D. boiling | |
| 14. |
Solids whose atoms arrange themselves in different forms are |
| A. | isotopes |
| B. | crystals |
| C. | allotropes |
| D. | amorphous |
| Answer» D. amorphous | |
| 15. |
If liquid is heated to increase kinetic energy then liquid will |
| A. | evaporate slowly |
| B. | evaporate faster |
| C. | will not evaporate |
| D. | boil |
| Answer» C. will not evaporate | |
| 16. |
Melting and freezing of a substance occurs as |
| A. | same temperature |
| B. | more than melting point |
| C. | more than freezing point |
| D. | less than boiling point |
| Answer» B. more than melting point | |
| 17. |
Barometer is invented by |
| A. | Galileo |
| B. | Robert Boyle |
| C. | Charles |
| D. | Torricelli |
| Answer» E. | |
| 18. |
At mount Everest water boils at |
| A. | 100°C |
| B. | 90°C |
| C. | 80°C |
| D. | 70°C |
| Answer» E. | |
| 19. |
Movement of molecules from higher concentration to lower concentration is called |
| A. | diffusion |
| B. | concentration |
| C. | effusion |
| D. | mobility |
| Answer» B. concentration | |
| 20. |
On increasing temperature of amorphous solid they |
| A. | melt at specific temperature |
| B. | soften gradually |
| C. | break at specific temperature |
| D. | boil at specific temperature |
| Answer» C. break at specific temperature | |
| 21. |
Pressure that vapors apply on surface of liquid at equilibrium is called |
| A. | torr |
| B. | vapor pressure |
| C. | liquid pressure |
| D. | condensation |
| Answer» C. liquid pressure | |
| 22. |
Molecules of liquid which escape first have |
| A. | highest kinetic energy |
| B. | lowest kinetic energy |
| C. | moderate kinetic energy |
| D. | infinite kinetic energy |
| Answer» B. lowest kinetic energy | |
| 23. |
Mathematical expression that describes Boyle's law is |
| A. | PV = constant |
| B. | V * constant = P |
| C. | P * constant = V |
| D. | V ⁄ P = constant |
| Answer» B. V * constant = P | |
| 24. |
At constant pressure average kinetic energy of gas molecules increases 2 times if |
| A. | temperature is increased by 2 times |
| B. | temperature is halved |
| C. | no change in temperature |
| D. | none of above |
| Answer» B. temperature is halved | |
| 25. |
Temperature at which solid starts melting is called |
| A. | boiling point |
| B. | freezing point |
| C. | melting point |
| D. | none of above |
| Answer» D. none of above | |
| 26. |
Conversion of a liquid to a gas at all temperatures is called |
| A. | sublimation |
| B. | evaporation |
| C. | condensation |
| D. | boiling |
| Answer» C. condensation | |
| 27. |
Process in which solid changes directly in to vapors without changing in liquid state is called |
| A. | condensation |
| B. | evaporation |
| C. | boiling |
| D. | sublimation |
| Answer» E. | |
| 28. |
Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas? |
| A. | The most probable speed increases |
| B. | The fraction of the molecules with the most probable speed increases |
| C. | The distribution becomes broader |
| D. | The area under the distribution curve remains the same as under the lower temperature |
| Answer» C. The distribution becomes broader | |
| 29. |
In two vessels of 1 L each at the same temperature 1 g of H2 and 1 g of CH4 are taken, for these |
| A. | Vrms values will be same |
| B. | kinetic energy per/mol will be same |
| C. | total kinetic energy will same |
| D. | pressure will be same |
| Answer» C. total kinetic energy will same | |
| 30. |
In the equation of state of an ideal gas PV = n RT, the value of the universal gas constant would depend only on |
| A. | the nature of the gas |
| B. | the pressure of the gas |
| C. | the units of the measurement |
| D. | None of the above |
| Answer» D. None of the above | |
| 31. |
In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1 dm3 at 273K? |
| A. | 0.071 g |
| B. | 0.0355 g |
| C. | 0.02 mole |
| D. | 6.023 × 1021 molecules |
| Answer» C. 0.02 mole | |
| 32. |
In order to increase the volume of a gas by 10%, the pressure of the gas should be |
| A. | increased by 10% |
| B. | increased by 1% |
| C. | decreased by 10% |
| D. | decreased by 1% |
| Answer» D. decreased by 1% | |
| 33. |
In a flask of ‘V’ litres, 0.2 moles of O2, 0.4 moles of N2, 0.1 moles of NH3 and 0.3 moles of He gases are present at 27°C. If total pressure exerted by these non-reacting gases is 1 atm, the partial pressure exerted by N2 gas is |
| A. | 0.4 atm |
| B. | 0.3 atm |
| C. | 0.2 atm |
| D. | 0.1 atm |
| Answer» B. 0.3 atm | |
| 34. |
If a gas expands at constant temperature, it indicates that: |
| A. | Number of the molecules of gas increases |
| B. | Kinetic energy of molecules decreases |
| C. | Pressure of the gas increases |
| D. | Kinetic energy of molecules remains the same |
| Answer» B. Kinetic energy of molecules decreases | |
| 35. |
A gas deviates from ideal behaviour at a high pressure because its molecules |
| A. | attract one another |
| B. | show the Tyndall effect |
| C. | have kinetic energy |
| D. | are bound by covalent bonds |
| Answer» B. show the Tyndall effect | |
| 36. |
A certain mass of a gas occupies a volume of 2 litres at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant? |
| A. | 100 k |
| B. | 273 k |
| C. | 273°C |
| D. | 546°C |
| Answer» D. 546°C | |
| 37. |
A and B are ideal. The molecular weights of A and B are in the ratio of 1:4. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture? |
| A. | P/2.5 |
| B. | P/2 |
| C. | P/5 |
| D. | 3P/4 |
| Answer» D. 3P/4 | |
| 38. |
7.5 grams of a gas occupy 5.6 litres of volume at STP. The gas is (Atomic weights of C, N and O are 12, 14 and respectively) |
| A. | NO |
| B. | N2O |
| C. | CO |
| D. | CO2 |
| Answer» B. N2O | |
| 39. |
4 gms of an ideal gas occupies 5.6035 liters of volume at 546K and 2atm pressure. What is its molecular weight? |
| A. | 4 |
| B. | 16 |
| C. | 32 |
| D. | 64 |
| Answer» C. 32 | |
| 40. |
138 grams of ethyl alcohol is mixed with 72 grams of water. The ratio of mole fraction of alcohol to water is |
| A. | 3 : 4 |
| B. | 1 : 2 |
| C. | 1 : 4 |
| D. | 1 : 1 |
| Answer» B. 1 : 2 | |
| 41. |
10g each of CH4 and O2 are kept in cylinders of same volume under same temperatures, give the pressure ratio of two gases. |
| A. | 2 : 1 |
| B. | 1 : 4 |
| C. | 2 : 3 |
| D. | 3 : 4 |
| Answer» B. 1 : 4 | |
| 42. |
‘n’ mole of an ideal gas at temperature T (in Kelvin) occupy “V” litres of volume, exerting a pressure of ‘P’ atmospheres. What is its concentration (in mole.lit)? (R = gas constant) |
| A. | P/RT |
| B. | PT/R |
| C. | RT/P |
| D. | R/PT |
| Answer» B. PT/R | |
| 43. |
Hydrogen diffuses six times faster than gas A. The molar mass of gas A is: |
| A. | 24 |
| B. | 36 |
| C. | 72 |
| D. | 96 |
| Answer» D. 96 | |
| 44. |
For one mole of an ideal gas, increasing the temperature from 10°C to 20°C ______. |
| A. | increases the rms velocity by √2 times. |
| B. | increases the average kinetic energy by two times. |
| C. | increases both the average kinetic energy and rms velocity, but not significantly. |
| D. | increases the rms velocity by two times. |
| Answer» D. increases the rms velocity by two times. | |
| 45. |
Equal masses of ethane and hydrogen are mixed in any empty container at 25°C. The fraction of total pressure exerted by hydrogen is |
| A. | 1: 2 |
| B. | 1 : 1 |
| C. | 1 : 16 |
| D. | 15: 16 |
| Answer» E. | |
| 46. |
By what ratio the average velocity of the molecule in gas change when the temperature is raised from 50 to 200°C? |
| A. | 1.21/1 |
| B. | 1.46/1 |
| C. | 1.14/1 |
| D. | 4/1 |
| Answer» D. 4/1 | |
| 47. |
At 400K temperature and 0.0821 Pressure the density of Carbon dioxide is (gm/lit) |
| A. | 0.01 |
| B. | 0.11 |
| C. | 2.5 |
| D. | 4.4 |
| Answer» C. 2.5 | |
| 48. |
At 400 K, the root mean square (rms) speed of a gas X (molecular weight = 40) is equal to the most probable speed of gas Y at 60 K. The molecular weight of the gas Y is |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 10 |
| Answer» B. 6 | |
| 49. |
At 100K r.m.s velocity of a gas is 104 cm/sec hence at what temperature r.m.s velocity becomes 3 ×104cm/sec |
| A. | 900°C |
| B. | 327°C |
| C. | 627°C |
| D. | 127°C |
| Answer» D. 127°C | |
| 50. |
According to the kinetic theory of gases, in an ideal gas, between two successive collisions a gas molecule travels |
| A. | in a wavy path |
| B. | in a straight line path |
| C. | with an accelerated velocity |
| D. | in a circular path |
| Answer» C. with an accelerated velocity | |