MCQOPTIONS
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MCQOPTIONS
This section includes 6820 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 1601. |
The weight of iron on rusting iron - |
| A. | becomes more |
| B. | becomes less |
| C. | remains the same |
| D. | not sure |
| Answer» B. becomes less | |
| 1602. |
Deficiency of which metal causes ascratch on the skinappearance? |
| A. | Gold |
| B. | Iron |
| C. | silver |
| D. | Such as |
| Answer» E. | |
| 1603. |
The scientist who discovered radium? |
| A. | benjamin franklin |
| B. | madam curie |
| C. | Irene Curie |
| D. | John Dalton |
| Answer» C. Irene Curie | |
| 1604. |
What is hematite ore? |
| A. | of aluminum |
| B. | of copper |
| C. | of iron |
| D. | none of these |
| Answer» D. none of these | |
| 1605. |
Which of the following chemical compound is used in photography? |
| A. | aluminum hydroxide |
| B. | silver bromide |
| C. | potassium nitrate |
| D. | Sodium chloride |
| Answer» C. potassium nitrate | |
| 1606. |
What is the trade name of lead oxide? |
| A. | Litharge |
| B. | gallon |
| C. | Cinebar |
| D. | rutile |
| Answer» B. gallon | |
| 1607. |
Which metal is used in conductor batteries? |
| A. | copper |
| B. | lead |
| C. | aluminum |
| D. | Such as |
| Answer» C. aluminum | |
| 1608. |
Bleaching powder? |
| A. | CaOCl |
| B. | CaOCl₂ |
| C. | CaOCl₃ |
| D. | CaOCl₄ |
| Answer» C. CaOCl₃ | |
| 1609. |
What is the fuel used in a nuclear reactor? |
| A. | Coal |
| B. | uranium |
| C. | radium |
| D. | diesel |
| Answer» C. radium | |
| 1610. |
Which of the following is increased in order to impart hardness to steel? |
| A. | Carbon |
| B. | manganese |
| C. | Chromium |
| D. | silicone |
| Answer» C. Chromium | |
| 1611. |
used in solar cells? |
| A. | silicone |
| B. | Titanium |
| C. | caesian |
| D. | Such as |
| Answer» D. Such as | |
| 1612. |
Where is iron found in abundance? |
| A. | in milk |
| B. | in the egg |
| C. | in juicy fruits |
| D. | in green vegetables |
| Answer» E. | |
| 1613. |
Ruby and Sapphire are the oxides of? |
| A. | Copper |
| B. | tin |
| C. | Iron |
| D. | aluminum |
| Answer» E. | |
| 1614. |
The salts of which of the following elements give colors in fireworks? |
| A. | Zn व S |
| B. | K व Hg |
| C. | Sr व Ba |
| D. | Cr व Ni |
| Answer» D. Cr व Ni | |
| 1615. |
Although the amount of aluminum in the crust is higher than that of iron, aluminum is still costlier than iron because |
| A. | Aluminum is used more than iron |
| B. | Aluminum forms more alloys than iron |
| C. | The demand for aluminum fabricated equipment exceeds that of wrought iron equipment. |
| D. | Metallic methods of producing aluminum are more expensive than iron. |
| Answer» E. | |
| 1616. |
Which material is used to make coil of electric heater? |
| A. | Copper |
| B. | Iron |
| C. | silver |
| D. | nichrome |
| Answer» E. | |
| 1617. |
Calcium fluoride is added to calcium chloride in the extract of calcium metal, because |
| A. | It lowers the melting point. |
| B. | It acts as a water absorber. |
| C. | it acts as an oxidizer |
| D. | Makes calcium chloride an electrolyte. |
| Answer» B. It acts as a water absorber. | |
| 1618. |
The minimum standards required for setting up an aluminum enterprise in India are bauxite and . . . is available? |
| A. | Coal |
| B. | Electricity |
| C. | labor |
| D. | ready market |
| Answer» C. labor | |
| 1619. |
The alloy made from which metal is used to make parts in airplanes and railway coaches. |
| A. | copper |
| B. | Iron |
| C. | aluminum |
| D. | none of these |
| Answer» D. none of these | |
| 1620. |
What is the chemical formula of gypsum? |
| A. | 2CaSO₄ - H₂O |
| B. | CaSO₄ - 2H₂O |
| C. | CaSO₄ - 5H₂O |
| D. | MgSO₄ - 7H₂O |
| Answer» C. CaSO₄ - 5H₂O | |
| 1621. |
What is the chemical formula of borax salt? |
| A. | Na₂B₄O₇ - 10H₂O |
| B. | Na₂SO₄ --10H₂O |
| C. | Na₂CO₃ - 10H₂O |
| D. | NaHCO₃ |
| Answer» B. Na₂SO₄ --10H₂O | |
| 1622. |
What is the chemical formula of plaster of paris? |
| A. | CaSO₄ - 5H₂O |
| B. | 2CaSO₄ - H₂O |
| C. | (CaSO₄) ₂ - 2H₂O |
| D. | CaSO₄ - MgO |
| Answer» C. (CaSO₄) ₂ - 2H₂O | |
| 1623. |
What is the chemical form of plaster of paris? |
| A. | calcium sulfate |
| B. | calcium carbonate |
| C. | calcium oxide |
| D. | calcium oxalate |
| Answer» B. calcium carbonate | |
| 1624. |
What is the chemical formula of limestone? |
| A. | calcium chloride |
| B. | calcium oxide |
| C. | calcium carbonate |
| D. | calcium sulfate |
| Answer» D. calcium sulfate | |
| 1625. |
What is the chemical formula of dolomite? |
| A. | CaCO₃ |
| B. | CaSO₄ |
| C. | MgCO₃ |
| D. | CaCO₃ - MgCO₃ |
| Answer» E. | |
| 1626. |
On which products the hallmark mark is applied? |
| A. | food ingredient |
| B. | gold jewelery |
| C. | Petroleum products |
| D. | eco friendly products |
| Answer» C. Petroleum products | |
| 1627. |
What is the chemical composition of pearls? |
| A. | calcium carbonate |
| B. | calcium carbonate and magnesium carbonate |
| C. | calcium chloride |
| D. | calcium sulfate |
| Answer» B. calcium carbonate and magnesium carbonate | |
| 1628. |
What is the chemical name of lunar caustics? |
| A. | Sodium sulphate |
| B. | silver nitrate |
| C. | calcium carbonate |
| D. | mercuric chloride |
| Answer» C. calcium carbonate | |
| 1629. |
What is the chemical formula of Epsom salt? |
| A. | ZnSO₄ - 7H₂O |
| B. | Na₂SO₄ --10H₂O |
| C. | Na₂CO₃ - 10H₂O |
| D. | MgSO₄ - 7H₂O |
| Answer» E. | |
| 1630. |
Lives in iodized salts? |
| A. | free iodine |
| B. | calcium iodide |
| C. | magnesium iodide |
| D. | potassium iodide |
| Answer» E. | |
| 1631. |
With which chemical is human blood kept in blood cells? |
| A. | Sodium nitrate and dextrate |
| B. | sodium and oxygen |
| C. | oxygen and chlorine |
| D. | Potassium and calcium chloride |
| Answer» B. sodium and oxygen | |
| 1632. |
What is the chemical name of galena? |
| A. | lead sulfate |
| B. | lead oxide |
| C. | lead sulfide |
| D. | calcium sulfate |
| Answer» D. calcium sulfate | |
| 1633. |
Zinc sulphate is commonly used for? |
| A. | as a fungicide |
| B. | as an herbicide |
| C. | as a rodenticide |
| D. | as a deodorant |
| Answer» B. as an herbicide | |
| 1634. |
Enriched uranium is? |
| A. | Uranium rods kept in a special shell. |
| B. | Natural uranium in which the component of the radioactive U isotope is artificially increased. |
| C. | A mixture of natural uranium and thorium |
| D. | Uranium rods coated with chromium. |
| Answer» C. A mixture of natural uranium and thorium | |
| 1635. |
Which is used to remove acidity of stomach? |
| A. | magnesium chloride |
| B. | magnesium hydroxide |
| C. | magnesium sulfate |
| D. | magnesium acetate |
| Answer» C. magnesium sulfate | |
| 1636. |
What is Emery called? |
| A. | sodium hydroxide |
| B. | impure alumina |
| C. | potassium nitrate |
| D. | ammonium chloride |
| Answer» C. potassium nitrate | |
| 1637. |
Metals are good conductors because . . |
| A. | they have free electrons |
| B. | Their molecules are adjacent to each other. |
| C. | Their molecules collide freely. |
| D. | Their surface is reflective. |
| Answer» B. Their molecules are adjacent to each other. | |
| 1638. |
The wire used for installing a safe fuse is usually made of which material? |
| A. | tin |
| B. | lead |
| C. | Nickel |
| D. | tin and lead alloy |
| Answer» E. | |
| 1639. |
What is the baking powder used for making bread? |
| A. | sodium carbonate |
| B. | sodium bicarbonate |
| C. | Sodium sulphate |
| D. | Sodium chloride |
| Answer» C. Sodium sulphate | |
| 1640. |
What is the chemical formula of cinnabar? |
| A. | HgS |
| B. | PbS |
| C. | CuO |
| D. | MgSO₄ |
| Answer» B. PbS | |
| 1641. |
Is it normal alum? |
| A. | K₂SO₄ - Al₂ ( SO₄ ) ₃ - 24H₂O |
| B. | K₂SO₄ - Al₂ (SO₄) ₃ - 21H₂O |
| C. | K₂SO₄ - Al₂ (SO₄) ₃ - 18H₂O |
| D. | K₂SO₄ - Fe₂ ( SO₄ ) ₃ - 24H₂O |
| Answer» B. K₂SO₄ - Al₂ (SO₄) ₃ - 21H₂O | |
| 1642. |
What is the chemical formula of washing soda? |
| A. | NaOH |
| B. | Na₂CO₃ - 10H₂O |
| C. | NaHCO₃ |
| D. | Ca ( OH ) ₂ |
| Answer» C. NaHCO₃ | |
| 1643. |
Can gold be mixed? |
| A. | in sulfuric acid |
| B. | in nitric acid |
| C. | In a mixture of sulfuric acid and nitric acid |
| D. | In a mixture of nitric acid and hydrochloric acid |
| Answer» E. | |
| 1644. |
What is sodalime a mixture of? |
| A. | KOH+CaO |
| B. | NaOH+CaO |
| C. | Na₂CO₃+CaO |
| D. | CaCO₃+NaOH |
| Answer» C. Na₂CO₃+CaO | |
| 1645. |
Which element is essential in amalgam? |
| A. | Mercury |
| B. | magnesium |
| C. | manganese |
| D. | Iron |
| Answer» B. magnesium | |
| 1646. |
When kept in air for a while, a layer of green basic carbonate gets deposited on top of a metal. is that metal? |
| A. | copper |
| B. | silver |
| C. | Nickel |
| D. | Such as |
| Answer» B. silver | |
| 1647. |
What is the chemical name of bauxite? |
| A. | aluminum oxide |
| B. | aluminum chloride |
| C. | aluminum sulfate |
| D. | hydrated alumina |
| Answer» E. | |
| 1648. |
What is the chemical formula of hypo? |
| A. | Na₂S₂O₃ - 5H₂O |
| B. | NA₂S₂O₃ - 3H₂O |
| C. | NA₂S₂O₃ - 2H₂O |
| D. | NA₂S₂O₃ - 10H₂O |
| Answer» B. NA₂S₂O₃ - 3H₂O | |
| 1649. |
The salts of which of the following elements scatter color in firecrackers? |
| A. | Zinc and sulfur |
| B. | potassium and mercury |
| C. | strontium and barium |
| D. | chromium and nickel |
| Answer» D. chromium and nickel | |
| 1650. |
What is the chemical formula of banking soda? |
| A. | Na₂CO₃ |
| B. | Na₂CO₃ - H₂O |
| C. | Na₂CO₃ - 10H₂O |
| D. | NaHCO₃ |
| Answer» E. | |