MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The process which does not evolve CO2 in air is |
| A. | urning |
| B. | reathing |
| C. | rganic delay |
| D. | hotosynthesis |
| Answer» E. | |
| 2. |
Which gas is used as fire extinguisher ? |
| A. | arbon dioxide |
| B. | arbon monoxide |
| C. | arbon suboxide |
| D. | ulphur dioxide |
| Answer» B. arbon monoxide | |
| 3. |
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of |
| A. | O2 |
| B. | O |
| C. | nburnt petrol |
| D. | O2 |
| Answer» C. nburnt petrol | |
| 4. |
Man dies in the atmosphere of CO, because it |
| A. | ries up the blood |
| B. | ombines with O2 present in the body |
| C. | educes the organic matter of tissues |
| D. | ombines with the haemoglobin of blood, thereby making the later incapable of absorbing O2 |
| Answer» E. | |
| 5. |
Which one is the purest form of carbon? |
| A. | oal |
| B. | raphite |
| C. | iamond |
| D. | ron |
| Answer» D. ron | |
| 6. |
Which one is not a pure form of carbon? |
| A. | oal |
| B. | raphite |
| C. | iamond |
| D. | old |
| Answer» E. | |
| 7. |
The gas that causes suffocation and death when coal or coke is burnt in a closed room is |
| A. | ethane |
| B. | thane |
| C. | arbon monoxide |
| D. | arbon dioxide |
| Answer» D. arbon dioxide | |
| 8. |
Water gas is the combination of |
| A. | O and H2 |
| B. | O2and H2 |
| C. | O and H2O |
| D. | O2 and CO |
| Answer» B. O2and H2 | |
| 9. |
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is |
| A. | O2 |
| B. | 3 |
| C. | O |
| D. | ll of these |
| Answer» D. ll of these | |
| 10. |
Diamond is lustrous because |
| A. | t is colourless |
| B. | t is hard |
| C. | t is pure |
| D. | ts refractive index is high |
| Answer» E. | |
| 11. |
Hardest allotrope of carbon is |
| A. | iamond |
| B. | raphite |
| C. | oke |
| D. | amp black |
| Answer» B. raphite | |
| 12. |
Which among the following coal contains 90 per cent of carbon? |
| A. | nthracite |
| B. | itumen |
| C. | ignite |
| D. | eat |
| Answer» B. itumen | |
| 13. |
The gas used to extinguish fire is |
| A. | eon |
| B. | itrogen |
| C. | arbon dioxide |
| D. | arbon monoxide |
| Answer» D. arbon monoxide | |
| 14. |
Diamond is harder than graphite because of : |
| A. | ifference in layers of atoms |
| B. | etrahedral structure of diamond |
| C. | ifference of crystalline structures |
| D. | one of these |
| Answer» B. etrahedral structure of diamond | |
| 15. |
If lime water is kept in the air, it turns milky due to presence of : |
| A. | arbon dioxide |
| B. | itrogen |
| C. | xygen |
| D. | ulphurdioxide |
| Answer» B. itrogen | |
| 16. |
Diamonds are glittering and attractive because light incident on them undergoes |
| A. | ighest refraction |
| B. | ultiple internal reflections |
| C. | ultiple surface reflections |
| D. | undred percent transmission |
| Answer» C. ultiple surface reflections | |
| 17. |
The main source of carbon monoxide is |
| A. | ndustrial process |
| B. | uel combustion |
| C. | ransportation |
| D. | olid waste disposal |
| Answer» D. olid waste disposal | |
| 18. |
If we burn graphite, |
| A. | esidue will be left |
| B. | o residue will be left |
| C. | t will not burn |
| D. | t will change into diamond |
| Answer» C. t will not burn | |
| 19. |
The percentage of oxygen in air is approximately |
| A. | 00% |
| B. | % |
| C. | 8% |
| D. | 1% |
| Answer» E. | |
| 20. |
The most abundant constituent of atmospheric air is : |
| A. | arbon |
| B. | ydrogen |
| C. | xygen |
| D. | itrogen |
| Answer» E. | |
| 21. |
Air shows the property of |
| A. | 2 |
| B. | 2 |
| C. | oth A and B |
| D. | one of these |
| Answer» D. one of these | |
| 22. |
Ozone layer of atmosphere absorbs: |
| A. | ltraviolet rays |
| B. | nfra-red rays |
| C. | ll radiations of Light |
| D. | osmic rays. |
| Answer» B. nfra-red rays | |
| 23. |
Dry ice is the solid form of : |
| A. | ir |
| B. | arbon dioxide |
| C. | itrogen |
| D. | ater |
| Answer» C. itrogen | |
| 24. |
Dry powder fire extinguishers contain |
| A. | and |
| B. | and and sodium carbonate |
| C. | and and potassium carbonate |
| D. | and and sodium bicarbonate |
| Answer» E. | |
| 25. |
For extinguishing fire, we use |
| A. | ydrogen |
| B. | arbon Monoxide |
| C. | arbon Dioxide |
| D. | arsh gas |
| Answer» D. arsh gas | |
| 26. |
Air is said to be saturated when : |
| A. | t contains maximum content of water vapour |
| B. | ts pressure is minimum |
| C. | ts thickness is maximum |
| D. | t blows over the barren land |
| Answer» B. ts pressure is minimum | |
| 27. |
The inert gases are ____ in water. |
| A. | paringly soluble |
| B. | nsoluble |
| C. | oluble |
| D. | one of these |
| Answer» B. nsoluble | |
| 28. |
Candle is a mixture of |
| A. | araffin was and stearic acid |
| B. | ees wax and stearic acid |
| C. | igher fatty acids and stearic acid |
| D. | ees wax and paraffin wax |
| Answer» B. ees wax and stearic acid | |
| 29. |
Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ? |
| A. | ethane |
| B. | thane |
| C. | ropane |
| D. | utane |
| Answer» E. | |
| 30. |
Combustion of a candle is a/an |
| A. | hotochemical reaction |
| B. | hysical change |
| C. | ndothermic reaction |
| D. | xothermic reaction |
| Answer» E. | |
| 31. |
Rusting of iron takes place due to |
| A. | xidation |
| B. | arbonation |
| C. | xfoliation |
| D. | orrosion |
| Answer» B. arbonation | |
| 32. |
The working of a dry cell is based on |
| A. | ecomposition reaction |
| B. | pontaneous oxidation-reduction reaction |
| C. | ombination reaction |
| D. | lectrolysis |
| Answer» E. | |
| 33. |
Galvanization of iron is carried out using |
| A. | inc |
| B. | in |
| C. | opper |
| D. | hromium |
| Answer» B. in | |
| 34. |
The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called : |
| A. | inc plating |
| B. | lloy formation |
| C. | ulcanization |
| D. | alvanization |
| Answer» E. | |
| 35. |
When a spoon is to be electroplated with nickel the spoon is |
| A. | ipped in a nickel sulphate solution |
| B. | ade anode and a pure nickel rod, the cathode |
| C. | ade cathode and a pure nickel red, the anode |
| D. | oated with nickel sulphate and dried |
| Answer» D. oated with nickel sulphate and dried | |
| 36. |
The process of improving the quality of rubber by heating it with sulphur is called |
| A. | ulcanization |
| B. | cceleration |
| C. | ulphonation |
| D. | alvanization |
| Answer» B. cceleration | |
| 37. |
In galvanization, iron is coated with |
| A. | opper |
| B. | inc |
| C. | in |
| D. | ickel |
| Answer» C. in | |
| 38. |
An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a : |
| A. | ower transmittor |
| B. | attery |
| C. | ninterrupted power supply (UPS) |
| D. | enerator |
| Answer» C. ninterrupted power supply (UPS) | |
| 39. |
A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed? |
| A. | rom brown to blue-black |
| B. | rom brown to orange-red |
| C. | rom blue to pink |
| D. | rom pink to blue-green |
| Answer» B. rom brown to orange-red | |
| 40. |
The anode of a dry cell is made up of |
| A. | ron |
| B. | admium |
| C. | inc |
| D. | ead |
| Answer» D. ead | |
| 41. |
A non-electronic conductor is |
| A. | ron |
| B. | as Carbon |
| C. | opper Sulphate |
| D. | one of these |
| Answer» E. | |
| 42. |
Which one of the following metals is used to galvanise iron ? |
| A. | opper |
| B. | ead |
| C. | inc |
| D. | ercury |
| Answer» D. ercury | |
| 43. |
Galvanization is the : |
| A. | eposition of zinc on iron |
| B. | eposition of tin on iron |
| C. | eposition of copper on iron |
| D. | eposition of aluminium on iron |
| Answer» B. eposition of tin on iron | |
| 44. |
The anode in a dry cell consists of |
| A. | opper |
| B. | inc |
| C. | admium |
| D. | raphite |
| Answer» C. admium | |
| 45. |
The metal chiefly used for galvanising iron is : |
| A. | inc |
| B. | ercury |
| C. | admium |
| D. | in |
| Answer» B. ercury | |
| 46. |
An electric iron has a heating element made of : |
| A. | opper |
| B. | ungsten |
| C. | ichrome |
| D. | inc |
| Answer» D. inc | |
| 47. |
Iron is prevented from rusting by coating with zinc. This process is called as |
| A. | alvanisation |
| B. | orrosion |
| C. | ublimation |
| D. | eduction |
| Answer» B. orrosion | |
| 48. |
The metalused to galvanise iron to protect it from rusting is |
| A. | inc |
| B. | hromium |
| C. | ead |
| D. | ntimony |
| Answer» B. hromium | |
| 49. |
Silicone is a polymer of |
| A. | etraalkyl silane |
| B. | ilicon tetrachloride |
| C. | ialkyl dichloro silane |
| D. | ilane |
| Answer» D. ilane | |
| 50. |
The polymer obtained by the condensation of hexamethylene diamine and adipic acid is : |
| A. | ylon 66 |
| B. | erylene |
| C. | ollen's |
| D. | akelite |
| Answer» B. erylene | |