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MCQOPTIONS
This section includes 2539 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1651. |
After a hot sunny day, people sprinkle water on the roof-top because: |
| A. | water helps air around the roof-top to absorb the heat instantly. |
| B. | water has a lower specific heat capacity. |
| C. | water is easily available. |
| D. | water has a large latent heat of vaporization. |
| Answer» E. | |
| 1652. |
__________is not related to gases. |
| A. | Boyle’s Law |
| B. | Joule’s Law |
| C. | Avogadro’s Law |
| D. | Charles’s law |
| Answer» C. Avogadro’s Law | |
| 1653. |
Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vapour pressures of pure A and pure B are 7 × 103 Pa and 12 × 103 Pa, respectively. The composition of the vapour in equilibrium with a solution containing 40 mole percent of A at this temperature is |
| A. | xA = 0.76; xB = 0.24 |
| B. | xA = 0.28; xB = 0.72 |
| C. | xA = 0.4; xB = 0.6 |
| D. | xA = 0.37; xB = 0.63 |
| Answer» C. xA = 0.4; xB = 0.6 | |
| 1654. |
Proton has _______ charge. |
| A. | Negative |
| B. | Infinite |
| C. | Positive |
| D. | Neutral |
| Answer» D. Neutral | |
| 1655. |
Name the reducing agent used in the reaction to join railway tracks? |
| A. | Aluminium |
| B. | Nitrogen |
| C. | Carbon |
| D. | Carbon dioxide |
| Answer» B. Nitrogen | |
| 1656. |
At zero Kelvin temperature, Silicon is a/an ________. |
| A. | Conductor |
| B. | Semiconductor |
| C. | Superconductor |
| D. | Insulator |
| Answer» E. | |
| 1657. |
An atom can achieve octet by ______.I. Sharing electronII. Gaining electronIII. Losing electron |
| A. | Only I and II |
| B. | Only I and III |
| C. | Only II and III |
| D. | All I, II and III |
| Answer» E. | |
| 1658. |
A double bond between two carbon atoms is formed by ______. |
| A. | the transfer of two protons from one carbon atom to the other |
| B. | the transfer of one electron from one carbon atom to the other |
| C. | two shared electron pairs |
| D. | the sharing of two protons |
| Answer» D. the sharing of two protons | |
| 1659. |
Of the species O2, O2+ , O2-, O22- , which would have the shortest bond length ? |
| A. | O2- |
| B. | O2 |
| C. | O2+ |
| D. | O22- |
| Answer» D. O22- | |
| 1660. |
In the Modern Periodic Table, period ____and ____ contain two metalloids each. |
| A. | 4, 5 |
| B. | 3, 4 |
| C. | 5, 6 |
| D. | 6, 7 |
| Answer» B. 3, 4 | |
| 1661. |
Chemical formula for Laughing Gas is ____? |
| A. | N2O |
| B. | NO |
| C. | NO2 |
| D. | N2O3 |
| Answer» B. NO | |
| 1662. |
Ice floats on water because its density is _______. |
| A. | more than water |
| B. | zero |
| C. | same as water |
| D. | less than water |
| Answer» E. | |
| 1663. |
Natural gas mainly contains of ________. |
| A. | Ethane |
| B. | Propene |
| C. | Methane |
| D. | Butane |
| Answer» D. Butane | |
| 1664. |
In pressure vs temperature (Kelvin) graph at constant molar volume, the lines of graph are known as: |
| A. | isobar |
| B. | isochore |
| C. | isotherm |
| D. | isotone |
| Answer» C. isotherm | |
| 1665. |
Chemical formula for sulfurous acid is ________. |
| A. | \({H_2}S{O_4}\) |
| B. | \({H_2}S{O_3}\) |
| C. | \({H_3}S{O_3}\) |
| D. | \({H_3}S{O_4}\) |
| Answer» C. \({H_3}S{O_3}\) | |
| 1666. |
A milkman adds a small amount of baking soda to fresh milk: |
| A. | To improve taste of milk |
| B. | To increase the cream in the milk |
| C. | To prevent acidification of milk |
| D. | To improve the consistency of milk |
| Answer» D. To improve the consistency of milk | |
| 1667. |
Poisonous mustard gas is a |
| A. | Gas |
| B. | Liquid |
| C. | Solid |
| D. | None of the above |
| Answer» C. Solid | |
| 1668. |
A _________ thread is actually stronger than a steel wire. |
| A. | wool |
| B. | cotton |
| C. | jute |
| D. | nylon |
| Answer» E. | |
| 1669. |
In a titration of aqueous solution of borax with HCl, indicator used will be |
| A. | Phenolphthalein |
| B. | Xylenol Blue |
| C. | Methyl red |
| D. | Erichrome black T |
| Answer» B. Xylenol Blue | |
| 1670. |
LNG stands for : |
| A. | Liquid Nitrogen Gas |
| B. | Liquefied Nitrogen Gas |
| C. | Liquid Neon Gas |
| D. | Liquefied Natural Gas |
| Answer» E. | |
| 1671. |
Among the following one which does not exist is |
| A. | NF5 |
| B. | SbF5 |
| C. | PF5 |
| D. | AsF5 |
| Answer» B. SbF5 | |
| 1672. |
Haber’s process is used for the synthesis of ________. |
| A. | H2SO4 |
| B. | HNO3 |
| C. | NH3 |
| D. | None of these |
| Answer» D. None of these | |
| 1673. |
Based on the periodic trends for ionization energy, which element has the highest ionization energy? |
| A. | Bromine |
| B. | Fluorine |
| C. | Helium |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
| 1674. |
Mg2+ is isoelectronic with |
| A. | Ca2+ |
| B. | Na+ |
| C. | Zn2+ |
| D. | Cu+ |
| Answer» C. Zn2+ | |
| 1675. |
'At constant temperature, the solubility of a gas in a liquid is proportional to the partial pressure of the gas collected above the surface of the liquid or solution'. What is this rule? |
| A. | Henry's law |
| B. | Boyle's law |
| C. | Charles' law |
| D. | Newton's law |
| Answer» B. Boyle's law | |
| 1676. |
Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ________. |
| A. | Copper |
| B. | Zinc |
| C. | Silver |
| D. | Aluminium |
| Answer» C. Silver | |
| 1677. |
Isotopes are atoms showing same _____? |
| A. | Atomic Number |
| B. | Atomic Mass |
| C. | Mass Number |
| D. | Number of Neutrons |
| Answer» B. Atomic Mass | |
| 1678. |
For silver, Cp (JK-1 mol-1) = 23 + 0.01T. If the temperature (T) of 3 moles of silver is raised from 300 K to 1000 K at 1 atm pressure, the value of ΔH will be close to: |
| A. | 62 kJ |
| B. | 16 kJ |
| C. | 21 kJ |
| D. | 13 kJ |
| Answer» B. 16 kJ | |
| 1679. |
A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 mL of CO2 at T = 2981.5 K and p = 1 bar. If molar volume of CO2 is 25.0 L under such condition, what is the percentage of sodium bicarbonate in each tablet? [Molar mass of NaHCO3 = 84 gmol-1] |
| A. | 8.4 |
| B. | 0.84 |
| C. | 16.8 |
| D. | 33.6 |
| Answer» B. 0.84 | |
| 1680. |
5 moles of AB2 weigh 125 × 10-3 kg and 10 moles of A2 B2 weigh 300 × 10-3 kg. The molar mass of A (MA) and molar mass of B (MB) in Kg mol-1 are: |
| A. | MA = 10 × 10-3 and MB = 5 × 10-3 |
| B. | MA = 50 × 10-3 and MB = 25 × 10-3 |
| C. | MA = 25 × 10-3 and MB = 50 × 10-3 |
| D. | MA = 5 × 10-3 and MB = 10 × 10-3 |
| Answer» E. | |
| 1681. |
How many moles of hydrogen atom are present in one mole of Aluminium hydroxide? |
| A. | One mole |
| B. | Two moles |
| C. | Three moles |
| D. | Four moles |
| Answer» D. Four moles | |
| 1682. |
Lemon juice tastes sour because it contains _________. |
| A. | Bases |
| B. | Acids |
| C. | Salts |
| D. | Minerals |
| Answer» C. Salts | |
| 1683. |
Metallurgy is the process of ______. |
| A. | Extracting metals from the Ore |
| B. | Roasting the Ore |
| C. | Liquefaction of metals |
| D. | Adding metal to the Ore in blast furnace |
| Answer» B. Roasting the Ore | |
| 1684. |
Aqua regia is a mixture of concentrated HNO3 and concentrated HCl in the ratio ________. |
| A. | 3 : 1 |
| B. | 2 : 3 |
| C. | 1 : 2 |
| D. | 1 : 3 |
| Answer» E. | |
| 1685. |
Match the following items of column (A) with column (B). Column A Column BI.Carbon1.In making electric wireII.Copper2.As fuelIII.Iron3.In wrapping food itemsIV.Aluminium4.For machinery |
| A. | I – 2, II – 1, III – 4, IV – 3 |
| B. | I – 3, II – 1, III – 2, IV – 4 |
| C. | I – 1, II – 2, III – 3, IV – 4 |
| D. | I – 4, II – 3, III – 2, IV – 1 |
| Answer» B. I – 3, II – 1, III – 2, IV – 4 | |
| 1686. |
Name the compound represented by the formula Al2(SO4)3. |
| A. | Aluminium sulphite |
| B. | Aluminium sulphide |
| C. | Aluminium sulphuroxide |
| D. | Aluminium sulphate |
| Answer» E. | |
| 1687. |
A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation\(\frac{x}{m} = {\rm{k}}{{\rm{p}}^{0.5}}\)Adsorption of the gas increases with: |
| A. | Decrease in p and increase in T |
| B. | Decrease in p and decrease in T |
| C. | Increase in p and decrease in T |
| D. | Increase in p and increase in T |
| Answer» D. Increase in p and increase in T | |
| 1688. |
Presence of which among the following is essential for rusting?I. Water (or water vapour)II. Oxygen |
| A. | Only I |
| B. | Only II |
| C. | Both I and II |
| D. | Neither I nor II |
| Answer» D. Neither I nor II | |
| 1689. |
Alkaline medium inhibits the rusting of iron, because: |
| A. | OH- are produced |
| B. | Non availability of H+ ions which reduces oxidation of Fe to Fe+2 ions |
| C. | OH- ions are not produced |
| D. | Rate of oxidation of iron is high |
| Answer» C. OH- ions are not produced | |
| 1690. |
Liquefied Petroleum Gas (LPG) is mainly a mixture of: |
| A. | Butane and Isobutane |
| B. | Propane and Isobutane |
| C. | Propane and Butane |
| D. | Propane and Tetralin |
| Answer» D. Propane and Tetralin | |
| 1691. |
LPG used as domestic fuel chiefly contains |
| A. | Methane |
| B. | Propane |
| C. | Ethylene |
| D. | Butane |
| E. | None of the above/More than one of the above |
| Answer» F. | |
| 1692. |
Calculate the number of Mg ions present in 0.019 g of magnesium chloride. [atomic mass of Mg = 24] |
| A. | 1.144 × 1022 |
| B. | 1.20 × 1023 |
| C. | 1.20 × 1020 |
| D. | 6.022 × 1023 |
| Answer» D. 6.022 × 1023 | |
| 1693. |
During Galvanization, which metal is used for coating iron and steel objects, preventing them from rusting? |
| A. | Zinc |
| B. | Copper |
| C. | Aluminium |
| D. | Bronze |
| Answer» B. Copper | |
| 1694. |
Essential component of an amalgam is ________. |
| A. | an acid |
| B. | mercury |
| C. | a base |
| D. | a non-metal |
| Answer» C. a base | |
| 1695. |
Eka-silicon is known as ________. |
| A. | Germanium |
| B. | Silicon |
| C. | Gallium |
| D. | Aluminium |
| Answer» B. Silicon | |
| 1696. |
In 23.3 g of zinc, the number of moles is: |
| A. | 0.53 |
| B. | 0.35 |
| C. | 0.37 |
| D. | 0.25 |
| Answer» C. 0.37 | |
| 1697. |
LPG (Liquified Petroleum Gas) is a mixture of |
| A. | methane and propane |
| B. | ethane and propane |
| C. | butane and propane |
| D. | propane and hexane |
| Answer» D. propane and hexane | |
| 1698. |
Lead nitrate on heating gives |
| A. | PbO2 and N02 |
| B. | PbO and N02 |
| C. | PbO and NO |
| D. | Pb02 and NO |
| Answer» C. PbO and NO | |
| 1699. |
Batteries used in mobile and smart phones are ___________. |
| A. | Dry cell |
| B. | Mercury cell |
| C. | Lithium-ion battery |
| D. | Lead storage battery |
| Answer» D. Lead storage battery | |
| 1700. |
On coming down, the group in periodic table.A. The value of electronegativity decreases.B. Atomic radius increasesC. The value of ionisation enthalpy decreases |
| A. | Only B |
| B. | Only C |
| C. | A, B and C |
| D. | Only A |
| Answer» D. Only A | |