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MCQOPTIONS
This section includes 1489 Mcqs, each offering curated multiple-choice questions to sharpen your 8th Class knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
The non metal that can conduct electricity is: |
| A. | Carbon |
| B. | Graphite |
| C. | Diamond |
| D. | None |
| Answer» C. Diamond | |
| 402. |
The process of coating iron sheets with a thin layer of zinc is called |
| A. | Hibernation |
| B. | Electroplating |
| C. | Galvanisation |
| D. | None |
| Answer» D. None | |
| 403. |
Chromium & Nickel metals are used for |
| A. | Stainless steel |
| B. | Electro plating |
| C. | Galvanisation |
| D. | None |
| Answer» C. Galvanisation | |
| 404. |
Painting keeps away __ and __ from steel structures and prevents rusting of it |
| A. | Oxides and chlorides |
| B. | Air and moisture |
| C. | Nitrogen and Oxygen |
| D. | None |
| Answer» C. Nitrogen and Oxygen | |
| 405. |
Sulphur is used in volcanisation of ____ |
| A. | Tyre |
| B. | Rubber |
| C. | Polymer |
| D. | None |
| Answer» B. Rubber | |
| 406. |
(P) Duralumin - (Al = 95%, Cu = 4%, Mn = 0.5%, Mg=0.5%) (Q) Solder- (Sn = 50% to 60% Pb = 50% to 40%) (R) Brass- (Cu = 60% to 80% Sn = 0% to 40%) |
| A. | (P) (Q) (R) False True False |
| B. | (P) (Q) (R) True False True |
| C. | (P) (Q) (R) False True False |
| D. | (P) (Q) (R) True False False |
| Answer» C. (P) (Q) (R) False True False | |
| 407. |
(P) German silver is used in decorating sweets (Q) Ornamental gold is an alloy of gold and silver R) Coins are made up of pure metals |
| A. | (P) (Q) (R) False True False |
| B. | (P) (Q) (R) True False True |
| C. | (P) (Q) (R) False True True |
| D. | (P) (Q) (R) True False False |
| Answer» D. (P) (Q) (R) True False False | |
| 408. |
(P) Stain less steel is an alloy of iron and copper (Q) Ainico can also be called as magnetic steel (R) German silver is an alloy of silver and nickel (S) Bell metal and gun metal are Iron-carbon alloys. 3 |
| A. | (P) (Q) (R) (S) False True False False |
| B. | (P) (Q) (R) (S) False True False False |
| C. | (P) (Q) (R) (S) False True False True |
| D. | (P) (Q) (R) (S) True False False True |
| Answer» C. (P) (Q) (R) (S) False True False True | |
| 409. |
Common brass is an alloy of |
| A. | Cu and Tin |
| B. | Tin and Zinc |
| C. | Copper and zinc |
| D. | Bronze and lead |
| Answer» D. Bronze and lead | |
| 410. |
Chrome tungsten steel is used in making |
| A. | Drilling tool |
| B. | Ridged wheel |
| C. | Amalgam |
| D. | Solder |
| Answer» B. Ridged wheel | |
| 411. |
The non-metal which exist in liquid state at room temperature is: |
| A. | Diamond |
| B. | Graphite |
| C. | Carbon |
| D. | Bromine |
| Answer» E. | |
| 412. |
Among the following groups of oxides, the group that cannot be reduced by carbon to give the respective metals is |
| A. | \[C{{u}_{2}}O,{{K}_{2}}O\] |
| B. | \[F{{e}_{2}}{{O}_{3}},ZnO\] |
| C. | \[CaO,{{K}_{2}}O\] |
| D. | \[PbO,F{{e}_{3}}{{O}_{4}}\] |
| Answer» D. \[PbO,F{{e}_{3}}{{O}_{4}}\] | |
| 413. |
Which of the following reacts most vigorously with water? |
| A. | Na |
| B. | K |
| C. | Cs |
| D. | Rb |
| Answer» D. Rb | |
| 414. |
Which of the following is not found in free state? |
| A. | Cu |
| B. | Na |
| C. | Au |
| D. | Ag |
| Answer» C. Au | |
| 415. |
The most abundant element on earth's crust is |
| A. | Hydrogen |
| B. | Oxygen |
| C. | Silicon |
| D. | Carbon |
| Answer» C. Silicon | |
| 416. |
Ornaments are usually made up of____ gold. |
| A. | 24 Carat |
| B. | 22 carat |
| C. | 28 carat |
| D. | None |
| Answer» C. 28 carat | |
| 417. |
P. Metals are good conductors of electricity. Q. Metals are lustrous. R. Metals are generally soft. S. Metals are bad conductors of heat. |
| A. | (P) (Q) (R) (S) False False False True |
| B. | (P) (Q) (R) (S) True True False False |
| C. | (P) (Q) (R) (S) True False True False |
| D. | (P) (Q) (R) (S) True True True True |
| Answer» C. (P) (Q) (R) (S) True False True False | |
| 418. |
Column-A Column-B (i) Ductile (p) The property of making resonating sound. (ii) Malleable (q) A substance can be drawn into wires. (iii) Sonority (r) The substance can be beaten into thin sheets. (iv) Tensile strength (s) Ability to withstand the longitudinal pull. Choose the right match |
| A. | \[i\to p,ii\to q,iii\to r,iv\to s\] |
| B. | \[\text{i}\to q,ii\to r,iii\to p,iv\to s\] |
| C. | \[i\to s,ii\to p,iii\to q,iv\to r\] |
| D. | \[i\to r,ii\to s,iii\to p,iv\to q\] |
| Answer» C. \[i\to s,ii\to p,iii\to q,iv\to r\] | |
| 419. |
Which of the following can be beaten into thin sheets? |
| A. | Zinc |
| B. | Phosphorus |
| C. | Sulphur |
| D. | Oxygen |
| Answer» C. Sulphur | |
| 420. |
Assertion: Metals are sonorous. Reason: They are generally brittle in the solid state, they break into pieces when hammered. |
| A. | Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. |
| B. | Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. |
| C. | Assertion is correct and Reason is incorrect. |
| D. | Assertion is incorrect and Reason is correct |
| Answer» D. Assertion is incorrect and Reason is correct | |
| 421. |
The most common form of ___ is sand. |
| A. | Carbon |
| B. | Nitrogen |
| C. | Silica |
| D. | Sodium |
| E. | None of these |
| Answer» D. Sodium | |
| 422. |
Which one of the following is a property of plastics? |
| A. | Good Conductors of electricity. |
| B. | Good conductors of heat. |
| C. | Insoluble in water |
| D. | All the above |
| E. | None of these |
| Answer» D. All the above | |
| 423. |
Plastic buckets are preferred over iron buckets as they are: |
| A. | Light weight |
| B. | Non-reactive |
| C. | Resistant to corrosion |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 424. |
Which one of the following is also known as polytetrafluoroethylene? |
| A. | Bakelite |
| B. | Perspex |
| C. | Teflon |
| D. | Melamine |
| E. | None of these |
| Answer» D. Melamine | |
| 425. |
Which of the following metals reacts with cold water vigorously? |
| A. | Magnesium |
| B. | Silver |
| C. | Sodium |
| D. | Sulphur |
| E. | None of these |
| Answer» D. Sulphur | |
| 426. |
How well the substance can be hammered into sheets describes its: |
| A. | Ductility |
| B. | Luster |
| C. | Malleability |
| D. | Conductivity |
| E. | None of these |
| Answer» D. Conductivity | |
| 427. |
Aluminum can displace __ from its salt solution. |
| A. | Magnesium |
| B. | Sodium |
| C. | Calcium |
| D. | Copper |
| E. | None of these |
| Answer» E. None of these | |
| 428. |
A non-metal which is a good conductor of electricity. |
| A. | Hydrogen |
| B. | Sulphur |
| C. | Graphite |
| D. | Phosphorus |
| E. | None of these |
| Answer» D. Phosphorus | |
| 429. |
A non-metal which catches fire on being exposed to air is: |
| A. | Mercury |
| B. | Magnesium |
| C. | Calcium |
| D. | Phosphorus |
| E. | None of these |
| Answer» E. None of these | |
| 430. |
Oxides of non-metals: |
| A. | Turn Red litmus to blue. |
| B. | Turn Blue litmus to red. |
| C. | Brings no change to the litmus paper. |
| D. | Turn lime water milky. |
| E. | None of these |
| Answer» C. Brings no change to the litmus paper. | |
| 431. |
Which one of the chemical reactions is incorrect? (i) \[Fe\,S{{O}_{4}}+Zn\to Zn\,S{{O}_{4}}+Fe\] (ii) \[Zn\,S{{O}_{4}}+Fe\to Fe\,S{{O}_{4}}+Zn\] (iii) \[2Au+2HCl\to 2Au\,\,Cl+{{H}_{2}}\] (iv) \[Mg+Cu\,S{{O}_{4}}\to Mg\,S{{O}_{4}}+Cu\] |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (iii) and (iv) |
| D. | (i) and (iv) |
| E. | None of these |
| Answer» C. (iii) and (iv) | |
| 432. |
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife? |
| A. | Iron |
| B. | Sodium |
| C. | Gold |
| D. | Magnesium |
| E. | None of these |
| Answer» C. Gold | |
| 433. |
____: hard non-metal : : _____ : soft metal. |
| A. | Graphite, Copper |
| B. | Diamond, Potassium |
| C. | Diamond, Sulphur |
| D. | Enamel, Sodium |
| E. | None of these |
| Answer» C. Diamond, Sulphur | |
| 434. |
Which one of the following statements is correct? (i) A more reactive metal can displace a less reactive metal from its salt solution. (ii) Copper can displace magnesium from its salt solution. (iii) Magnesium can displace copper from its salt solution, (iv) A less reactive metal can displace a more reactive metal from its salt solution. |
| A. | (i) and (ii) |
| B. | (ii) and (iv) |
| C. | (i) and (iii) |
| D. | (iii) and (iv) |
| E. | None of these |
| Answer» D. (iii) and (iv) | |
| 435. |
Which one of the following is a thermosetting plastic? |
| A. | Teflon |
| B. | Melamine |
| C. | PVC |
| D. | Polyethene |
| E. | None of these |
| Answer» C. PVC | |
| 436. |
Which one of the following is used for making insulation for electric wires? |
| A. | Polythene |
| B. | PVC |
| C. | Teflon |
| D. | Melamine |
| E. | None of these |
| Answer» C. Teflon | |
| 437. |
Which one of the following can displace magnesium from magnesium sulphate solution? |
| A. | Aluminium |
| B. | Zinc |
| C. | Iron |
| D. | Copper |
| E. | None of these |
| Answer» F. | |
| 438. |
In which of the following chemical reactions hydrogen gas will not produce? |
| A. | When sodium reacts with water. |
| B. | When zinc reacts with dilute hydrochloric acid. |
| C. | When copper reacts with dilute sulphuric acid. |
| D. | When aluminum reacts with sodium hydroxide. |
| E. | None of these |
| Answer» D. When aluminum reacts with sodium hydroxide. | |
| 439. |
Rust is a/an: |
| A. | Acidic oxide |
| B. | Basic oxide |
| C. | Neutral oxide |
| D. | Basic nitrate |
| E. | None of these |
| Answer» C. Neutral oxide | |
| 440. |
Which two fibres combine to form terrycot? |
| A. | Nylon and Rayon |
| B. | Terylene and Terene |
| C. | Terylene and cotton |
| D. | Acrylic and cotton |
| E. | None of these |
| Answer» D. Acrylic and cotton | |
| 441. |
Which one of the following groups is completely made of chemicals? |
| A. | Silk, Rayon, PVC |
| B. | Nylon, Wool, Acrylic |
| C. | Acrylic, Polyethene, Teflon |
| D. | PVC, Silk, Nylon |
| E. | None of these |
| Answer» D. PVC, Silk, Nylon | |
| 442. |
The substance that will be flattened on beating with a hammer is: |
| A. | Crystal of iodine |
| B. | Lump of sulphur |
| C. | Piece of coal |
| D. | Zinc granule |
| E. | None of these |
| Answer» E. None of these | |
| 443. |
Which one of the following is correct about nylon fibres? |
| A. | Nylon fibres are very strong. |
| B. | NyIon fibres absorb very little water. |
| C. | NyIon fibres are fairly elastic. |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 444. |
The gas produced when a metal reacts with dilute hydrochloric acid and burnt by producing a popping sound. |
| A. | Oxygen |
| B. | Carbon dioxide |
| C. | Hydrogen |
| D. | Nitrogen |
| E. | None of these |
| Answer» D. Nitrogen | |
| 445. |
Choose the correct sequence of the metals in the increasing order of their reactivity. |
| A. | Cu < Pb < Ag < Na < K |
| B. | Ag < Pb < Cu < Na < K |
| C. | Ag < Cu < Pb < K < Na |
| D. | Ag < Cu < Pb < Na < K |
| E. | None of these |
| Answer» E. None of these | |
| 446. |
When acidic oxide of sulphur reacts with water it forms: |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Sulphurous |
| D. | Sulphur dioxide |
| E. | None of these |
| Answer» D. Sulphur dioxide | |
| 447. |
Rahul wants to gift a glass ? painting to Ankita. The packaging of glass painting should be made of: |
| A. | Teflon |
| B. | PVC |
| C. | Polystyrene |
| D. | Melamine |
| E. | None of these |
| Answer» D. Melamine | |
| 448. |
Which one of the following will not react with dilute hydrochloric acid? |
| A. | Aluminum |
| B. | Sodium |
| C. | Iron |
| D. | Silver |
| E. | None of these |
| Answer» E. None of these | |
| 449. |
Sulphur burns in air to make____. |
| A. | Basic oxide |
| B. | Acidic oxide |
| C. | Neutral oxide |
| D. | Acidic nitrate |
| E. | None of these |
| Answer» C. Neutral oxide | |
| 450. |
Which one of the following is a metal? |
| A. | A graphite pencil lead |
| B. | A diamond ring |
| C. | A Carbon rod |
| D. | A silver coin |
| E. | None of these |
| Answer» E. None of these | |