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. |
Brass is a solution of molten copper in |
| A. | olid zinc |
| B. | olten zinc |
| C. | aseous zinc |
| D. | olten tin |
| Answer» C. aseous zinc | |
| 2. |
The percentage of carbon in cast iron is : |
| A. | .01 to 0.25 |
| B. | .5 to 1.5 |
| C. | to 8 |
| D. | to 5 |
| Answer» E. | |
| 3. |
Food cans are coated with tin and not with zinc because |
| A. | inc is costlier than tin |
| B. | inc has a higher melting point than tin |
| C. | inc is more reactive than tin |
| D. | inc is less reactive than tin |
| Answer» D. inc is less reactive than tin | |
| 4. |
In which of the following states maximum iron ore is found ? |
| A. | eCO3 |
| B. | e2O3 |
| C. | e3O4 |
| D. | eS2 |
| Answer» C. e3O4 | |
| 5. |
Magnalium is an alloy of |
| A. | luminium and Magnesium |
| B. | agnesium and Tin |
| C. | luminium and Zinc |
| D. | anganese and Magnesium |
| Answer» B. agnesium and Tin | |
| 6. |
Which of the following is a metallic ore ? |
| A. | ica |
| B. | uartz |
| C. | eldspar |
| D. | alena |
| Answer» E. | |
| 7. |
Which mineral is the ore of aluminium ? |
| A. | aematite |
| B. | auxite |
| C. | agnetite |
| D. | iderite |
| Answer» C. agnetite | |
| 8. |
Which one of the following mineral does not contain oxygen ? |
| A. | aematite |
| B. | auxite |
| C. | ryolite |
| D. | alcite |
| Answer» D. alcite | |
| 9. |
Iron is extracted from |
| A. | innabar |
| B. | aematite |
| C. | auxite |
| D. | olomite |
| Answer» C. auxite | |
| 10. |
Which one of the following contains maximum percentage of carbon ? |
| A. | ast iron |
| B. | tainless steel |
| C. | rought iron |
| D. | igh speed steel |
| Answer» B. tainless steel | |
| 11. |
The purest form of Iron is : |
| A. | ast iron |
| B. | teel |
| C. | ig iron |
| D. | rought iron |
| Answer» E. | |
| 12. |
Hard steel contains |
| A. | to 5 per cent carbon |
| B. | .5 to 1.5 per cent carbon |
| C. | .1 to 0.4 per cent carbon |
| D. | .01 to 0.04 per cent carbon |
| Answer» C. .1 to 0.4 per cent carbon | |
| 13. |
Bauxite is an alloy of which of the following metals ? |
| A. | luminium |
| B. | ilver |
| C. | in |
| D. | ron |
| Answer» B. ilver | |
| 14. |
The iron ore which contains 72% of iron is : |
| A. | agnetite |
| B. | imonite |
| C. | aematite |
| D. | iderite |
| Answer» B. imonite | |
| 15. |
Galena is a mineral of |
| A. | ron |
| B. | old |
| C. | ead |
| D. | alcium |
| Answer» D. alcium | |
| 16. |
Which one of the following is not a characteristic feature of alloys? |
| A. | ompounds |
| B. | ixtures |
| C. | olutions |
| D. | omogeneous systems |
| Answer» E. | |
| 17. |
In which of the following substances all carbon atoms are quaternary in nature ? |
| A. | raphite |
| B. | iamond |
| C. | eflon |
| D. | apthalene |
| Answer» C. eflon | |
| 18. |
Which one of the following is used for dating very old objects of archaeological importance? |
| A. | hosphorus-31 |
| B. | ritium |
| C. | adium |
| D. | arbon-14 |
| Answer» E. | |
| 19. |
One property of ammonia is |
| A. | t is insoluble in water |
| B. | t is a odourless gas |
| C. | t is a yellowish gas |
| D. | ts aqueous solution turns red litmus blue |
| Answer» E. | |
| 20. |
Which of the following acts as promoter for iron in Haber's process? |
| A. | n |
| B. | o |
| C. | g |
| Answer» C. g | |
| 21. |
The gas dissolved in water that makes it basic is : |
| A. | mmonia |
| B. | ulphur dioxide |
| C. | ydrogen |
| D. | arbon dioxide |
| Answer» B. ulphur dioxide | |
| 22. |
Among the following iron ores, the highest percentage of iron content is found in– |
| A. | aemetite |
| B. | agnetite |
| C. | imnonite |
| D. | one of these |
| Answer» B. agnetite | |
| 23. |
The metal extracted from Bauxite is : |
| A. | ilver |
| B. | opper |
| C. | anganese |
| D. | luminium |
| Answer» E. | |
| 24. |
Epsom salt is used |
| A. | s purgative |
| B. | n softening water |
| C. | n paper industry |
| D. | n making tooth paste |
| Answer» B. n softening water | |
| 25. |
Chemical name of Gammaxane is |
| A. | oluene |
| B. | hloro benzene |
| C. | niline |
| D. | enzene hexachloride |
| Answer» C. niline | |
| 26. |
Froth floatation process to concentrate the minerals is applicable to |
| A. | alamine |
| B. | halcopyrites |
| C. | auxite |
| D. | aematite |
| Answer» C. auxite | |
| 27. |
The compound used in prickly heat powder to prevent excessive sweating is |
| A. | oric acid |
| B. | hosphoric acid |
| C. | arbonic acid |
| D. | ulphuric acid |
| Answer» B. hosphoric acid | |
| 28. |
Milk tastes sour when it is left in open for some time. This happens due to the formation of |
| A. | actic acid |
| B. | itric acid |
| C. | cetic acid |
| D. | arbonic acid |
| Answer» B. itric acid | |
| 29. |
Which acid is used in Lead storage battery? |
| A. | ulphuric acid |
| B. | itric acid |
| C. | ydrochloric acid |
| D. | cetic acid |
| Answer» B. itric acid | |
| 30. |
Muscle fatigue is caused by the accumulation of : |
| A. | yruvic acid |
| B. | actic acid |
| C. | xalacetic acid |
| D. | ric acid |
| Answer» C. xalacetic acid | |
| 31. |
Drinking soda is |
| A. | lkaline |
| B. | cidic |
| C. | eutral |
| D. | xidant |
| Answer» C. eutral | |
| 32. |
Curd is sour due to presence of |
| A. | artaric acid |
| B. | actic acid |
| C. | cetic acid |
| D. | xalic acid |
| Answer» C. cetic acid | |
| 33. |
The substance most commonly used as a food preservative is |
| A. | odium carbonate |
| B. | artaric acid |
| C. | cetic acid |
| D. | odium salt of benzoic acid |
| Answer» E. | |
| 34. |
Citric acid is present in free form in |
| A. | amarind |
| B. | ilk |
| C. | pple |
| D. | emon |
| Answer» E. | |
| 35. |
Which of the following acids serves as an electrolyte in a lead storage battery? |
| A. | ulphuric acid |
| B. | actic acid |
| C. | ydrochloric acid |
| D. | itric acid |
| Answer» B. actic acid | |
| 36. |
Which of the following is the strongest base in aqueous solution ? |
| A. | iethylamine |
| B. | riethylamine |
| C. | mmonia |
| D. | thylamine |
| Answer» B. riethylamine | |
| 37. |
Which one of the following acids is used in battery ? |
| A. | ydrochloric acid |
| B. | ydrofluoric acid |
| C. | ulphuric acid |
| D. | ulphurous acid |
| Answer» D. ulphurous acid | |
| 38. |
Surface water is a better source of drinking water because it is poor in |
| A. | ust |
| B. | acteria |
| C. | rsenic |
| D. | lgae |
| Answer» D. lgae | |
| 39. |
Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water. |
| A. | agnesium |
| B. | alcium |
| C. | anganese |
| D. | one of these |
| Answer» E. | |
| 40. |
In chemical terms, what are alums used for purifying water for drinking purposes ? |
| A. | ydrated chlorides |
| B. | ouble nitrate |
| C. | ouble sulphates |
| D. | itrates of aluminium |
| Answer» D. itrates of aluminium | |
| 41. |
Where does the oxygen that keeps us alive come from? |
| A. | arbon dioxide |
| B. | arbonates absorbed from soil |
| C. | xides of minerals |
| D. | ater |
| Answer» E. | |
| 42. |
Sweat contains water and ________ |
| A. | itric acid |
| B. | actic acid |
| C. | alt |
| D. | inegar |
| Answer» D. inegar | |
| 43. |
Bee sting contains |
| A. | n acidic liquid |
| B. | salt solution |
| C. | n alkaline liquid |
| D. | corrosive liquid |
| Answer» B. salt solution | |
| 44. |
The acid present in red ants is |
| A. | cetic acid |
| B. | utyric acid |
| C. | aproic acid |
| D. | ormic acid |
| Answer» E. | |
| 45. |
An acid having basicity one is |
| A. | odium dihydrogen phosphate |
| B. | isodium hydrogen phosphate |
| C. | odium phosphate |
| D. | hosphoric acid |
| Answer» C. odium phosphate | |
| 46. |
Sour taste of ‘Coca Cola’ is due to the presence of |
| A. | cetic acid |
| B. | hosphoric acid |
| C. | ydrochloric acid |
| D. | ormic acid |
| Answer» C. ydrochloric acid | |
| 47. |
Assertion (A) : Synthetic detergents can lather when in hard water.Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water. |
| A. | oth A and R is true and R is the correct explanation of A |
| B. | oth A and R is true but R is not a correct explanation of A |
| C. | is true but R is false |
| D. | is false but R is true |
| Answer» B. oth A and R is true but R is not a correct explanation of A | |
| 48. |
Which one of the following is extensively used for sterilizing water ? |
| A. | leaching powder |
| B. | lum |
| C. | orax powder |
| D. | oda powder |
| Answer» B. lum | |
| 49. |
Maximum permissible concentration of total hardness in drinking water is |
| A. | 0 |
| B. | 00 |
| C. | 00 |
| D. | 00 |
| Answer» D. 00 | |
| 50. |
The amount of chlorine available in water after disinfection is called as |
| A. | ree chlorine |
| B. | esidual chlorine |
| C. | ree available chlorine |
| D. | ombined available chlorine |
| Answer» C. ree available chlorine | |