MCQOPTIONS
Saved Bookmarks
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.
| 1551. |
At 100℃, copper (Cu) has FCC unit cell structure with cell edge length of x Å. What is the approximate density of Cu (in g m-3) at this temperature?[Atomic Mass of Cu = 63.55 u] |
| A. | \({\rm{\;}}\frac{{205}}{{{x^3}}}\) |
| B. | \({\rm{\;}}\frac{{105}}{{{x^3}}}\) |
| C. | \({\rm{\;}}\frac{{211}}{{{x^3}}}\) |
| D. | \({\rm{\;}}\frac{{422}}{{{x^3}}}\) |
| Answer» E. | |
| 1552. |
Baking soda is |
| A. | Na2CO3 |
| B. | NaHCO3 6H2O |
| C. | NaHCO3 |
| D. | NaCO3 10H2O |
| Answer» D. NaCO3 10H2O | |
| 1553. |
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change? |
| A. | Ammonium hydroxide solution |
| B. | Lime |
| C. | Hydrochloric acid |
| D. | Baking powder |
| Answer» D. Baking powder | |
| 1554. |
On placing an inverted tumbler over a burning candle, the candle flame extinguishes after a sometime. This is because of: |
| A. | Ignition temperature being low |
| B. | Non-availability of wax in the candle |
| C. | Non-availability of carbon dioxide |
| D. | Non-availability of oxygen |
| Answer» E. | |
| 1555. |
Calculate the standard cell potential (in V) of the cell in which following reaction takes place:Fe2+ (aq) + Ag+ (aq) → Fe3+ (aq) + Ag(s)Given that\({E^0}_{A{g^ + }/Ag} = x{\rm{\;}}V\)\({E^0}_{F{e^{2 + }}/Fe} = y{\rm{\;}}V\)\({E^0}_{F{{\rm{e}}^{3 + }}/Fe} = z{\rm{\;}}V\) |
| A. | x - z |
| B. | x - y |
| C. | x + 2y - 3z |
| D. | x + y - z |
| Answer» D. x + y - z | |
| 1556. |
Pyrolusite is an ore of: |
| A. | manganese |
| B. | chromium |
| C. | Aluminum |
| D. | Lead |
| Answer» B. chromium | |
| 1557. |
______ is a highly reactive halogen. |
| A. | Fluorine |
| B. | Chlorine |
| C. | Bromine |
| D. | Iodine |
| Answer» B. Chlorine | |
| 1558. |
According to Newlands’ Law of Octaves, how many elements exist in nature? |
| A. | 56 |
| B. | 66 |
| C. | 55 |
| D. | 65 |
| Answer» B. 66 | |
| 1559. |
Match List-I with List-II and select the correct answer using the code given below the Lists:List – I(Compound)List- II(Type of polymer)A. Melamine1. LinearB. Polyvinyl chloride2. CondensationC. Terylene3. NaturalD. Cellulose4. Cross-linked |
| A. | A-3, B-2, C-1, D-4 |
| B. | A-4, B-1, C-2, D-3 |
| C. | A-3, B-1, C-2, D-4 |
| D. | A-4, B-2, C-1, D-3 |
| Answer» C. A-3, B-1, C-2, D-4 | |
| 1560. |
Identify the correct pair of elements among the following which are liquid at room temperature and standard pressure. |
| A. | Bromine and fluorine |
| B. | Mercury and rubidium |
| C. | Bromine and thallium |
| D. | Bromine and mercury |
| Answer» E. | |
| 1561. |
Atomic number of which of the following elements is greater than that of Silicon ________ |
| A. | Aluminium |
| B. | Sulphur |
| C. | Magnesium |
| D. | Sodium |
| Answer» C. Magnesium | |
| 1562. |
In a molecule of water, hydrogen and oxygen are present in the ratio H : O = ________ |
| A. | 3 : 1 |
| B. | 2 : 1 |
| C. | 1 : 3 |
| D. | 1 : 2 |
| Answer» C. 1 : 3 | |
| 1563. |
Galvanization refers to ________. |
| A. | coating surface of metal with zinc |
| B. | mixing of metals |
| C. | coating a metal with oxide |
| D. | painting a metal |
| Answer» B. mixing of metals | |
| 1564. |
Halogens contains______. |
| A. | 2 gases, two liquids and 1 solid |
| B. | 2 gases and 3 solids |
| C. | 2 gases, one liquid and 2 solids |
| D. | 3 gases and 3 solids |
| Answer» D. 3 gases and 3 solids | |
| 1565. |
Calcium oxide reacts vigorously with water to produce slaked lime whose solution is used for white-washing walls. This slaked lime reacts with component (A) in air to form a thin layer of component (B) to give a shiny finish. What are the components (A) and (B) ? |
| A. | A - O2; B - CaCO3 |
| B. | A - CO2; B - Ca(OH)2 |
| C. | A - O2; Ca(OH)2 |
| D. | A - CO2; B - CaCO3 |
| Answer» E. | |
| 1566. |
________ is the major component of natural gas. |
| A. | Acetone |
| B. | Methane |
| C. | Chlorine |
| D. | Hexane |
| Answer» C. Chlorine | |
| 1567. |
Elements in a period have same ________. |
| A. | Number of valence electrons |
| B. | Valency |
| C. | Number of shells |
| D. | Volume |
| Answer» D. Volume | |
| 1568. |
How many groups and periods are present in the Modem Periodic Table? |
| A. | 9 groups, 9 periods |
| B. | 7 groups, 8 periods |
| C. | 18 groups, 7 periods |
| D. | 8 groups, 7 periods |
| Answer» D. 8 groups, 7 periods | |
| 1569. |
On heating crystalline magnesium sulfate loses mass and the remaining mass is 24% of its original mass. The mass of water (in grams) present in the salt is: |
| A. | 180 |
| B. | 7 |
| C. | 126 |
| D. | 48.76 |
| Answer» D. 48.76 | |
| 1570. |
Match List - I with List-II and select the correct answer from the codes given below the lists:List - I(Element)List – II(Application)A. Isotope of Uranium1. Treatment of cancerB. Isotope of Cobalt2. Treatment of goitreC. Isotope of Iodine3. Treatment of secondary cancerD. Isotope of Radium4. Nuclear fuel |
| A. | A - 3, B - 2, C - 1, D - 4 |
| B. | A - 4, B - 2, C - 1, D - 3 |
| C. | A - 4, B - 1, C - 2, D - 3 |
| D. | A - 3, B - 1, C - 2, D - 4 |
| Answer» D. A - 3, B - 1, C - 2, D - 4 | |
| 1571. |
Metallurgy is the process of: |
| A. | rusting of iron. |
| B. | distillation. |
| C. | extracting metals from ore. |
| D. | galvanization of ores. |
| Answer» D. galvanization of ores. | |
| 1572. |
Bhopal Gas Tragedy was caused due to the leakage of: |
| A. | Methyl Isocyanate |
| B. | Nitrogen dioxide |
| C. | Sulphur dioxide |
| D. | Carbon monoxide |
| Answer» B. Nitrogen dioxide | |
| 1573. |
Copper Sulphate solution cannot be stored in an Iron container because |
| A. | Iron dissolves in copper sulphate solution |
| B. | Iron crystallizes as ferrous sulphate |
| C. | Iron forms Ferric sulphate and forms a suspension |
| D. | Copper is more reactive than iron |
| Answer» B. Iron crystallizes as ferrous sulphate | |
| 1574. |
Match the following:List - IList - II(a) Aspirine(i) Cyclotrunethylene trinitamine(b) Muriatic acid(ii) Acetylsalicylic acid(c) Ibuprofen(iii) Hydrochloric acid(d) R.D.X(iv) Aryl methyl acetic acid |
| A. | (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i) |
| B. | (a) - (iv), (b) - (ii), (c) - (iii), (d) - (i) |
| C. | (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) |
| D. | (a) - (ii), (b) - (iii), (c) - (i), (d) - (iv) |
| Answer» D. (a) - (ii), (b) - (iii), (c) - (i), (d) - (iv) | |
| 1575. |
Brass contains ____? |
| A. | Copper and Tin |
| B. | Copper an Silver |
| C. | Copper and Nickel |
| D. | Copper and Zinc |
| Answer» E. | |
| 1576. |
Non metals are non conductors of- |
| A. | Heat |
| B. | Electricity |
| C. | Both (a) & (b) |
| D. | None of these |
| Answer» D. None of these | |
| 1577. |
In Haber process, bonds between ammonia and iron surface weaken and break during |
| A. | adsorption |
| B. | chemisorption |
| C. | both (A) and (B) |
| D. | desorption |
| Answer» E. | |
| 1578. |
Identify the odd man from among the below options. |
| A. | Ice |
| B. | Water |
| C. | Juice |
| D. | Petrol |
| Answer» B. Water | |
| 1579. |
Atoms of the same element or of different elements can join together to form- |
| A. | Elements |
| B. | Molecules |
| C. | Ions |
| D. | Alloys |
| Answer» C. Ions | |
| 1580. |
Name the sugars present in honey _________. |
| A. | Levulose |
| B. | Maltose |
| C. | Dextrose |
| D. | All of these |
| Answer» E. | |
| 1581. |
In the nth orbit of an atom the maximum number of electron is |
| A. | n2 |
| B. | 2n2 |
| C. | n + 2 |
| D. | n - 2 |
| Answer» C. n + 2 | |
| 1582. |
A molecule of Oxygen has ________. |
| A. | a double covalent bond |
| B. | an electrovalent bond |
| C. | a triple covalent bond |
| D. | a single covalent bond |
| Answer» B. an electrovalent bond | |
| 1583. |
"Acid rain" is caused by the presence of oxides of X and Y in air. X and Y are respectively |
| A. | Nitrogen, Sulphur |
| B. | Sulphur, Lead |
| C. | Lead, Mercury |
| D. | Nitrogen, Lead |
| Answer» B. Sulphur, Lead | |
| 1584. |
Arrange the following compounds in the increasing order of their carbon bond length:Ethene, Ethyne, Ethane. |
| A. | Ethene, Ethyne, Ethane |
| B. | Ethyne, Ethene, Ethane |
| C. | Ethane, Ethene, Ethyne |
| D. | Ethane, Ethyne, Ethene |
| Answer» C. Ethane, Ethene, Ethyne | |
| 1585. |
In 1934 who invented the cyclotron? A cyclotron is a type of particle accelerator in which charged particles accelerate outwards from the centre along a spiral path? |
| A. | Enrico Fermi |
| B. | J. J. Thomson |
| C. | Ernest Rutherford |
| D. | Ernest O. Lawrence |
| Answer» E. | |
| 1586. |
12 g of oxygen contains _________ mole. |
| A. | 0.4 |
| B. | 0.375 |
| C. | 0.5 |
| D. | 3.75 |
| Answer» C. 0.5 | |
| 1587. |
A heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium is known as- |
| A. | Saturated solution |
| B. | Suspension |
| C. | Unsaturated solution |
| D. | Colloids |
| Answer» C. Unsaturated solution | |
| 1588. |
'Laughing Gas' is: |
| A. | Hydrogen Peroxide |
| B. | Nitrous Oxide |
| C. | Carbon Monoxide |
| D. | Sulphur Dioxide |
| Answer» C. Carbon Monoxide | |
| 1589. |
Glucose and Galactose are having identical configuration in all the positions except position: |
| A. | C-3 |
| B. | C-4 |
| C. | C-2 |
| D. | C-5 |
| Answer» C. C-2 | |
| 1590. |
Baking powder contains _______. |
| A. | calcium chloride |
| B. | sodium bicarbonate |
| C. | magnesium sulfate |
| D. | sodium chloride |
| Answer» C. magnesium sulfate | |
| 1591. |
A biochemical compound is any ________. |
| A. | carbon-based compound found in living things |
| B. | hydrogen-based compound found in living things |
| C. | mineral-based compound found in living things |
| D. | sulfur-based compound found in living things |
| Answer» B. hydrogen-based compound found in living things | |
| 1592. |
________is the process of absorption of moisture from air. |
| A. | Deliquescence |
| B. | Capillary action |
| C. | Absorption |
| D. | Osmosis |
| Answer» B. Capillary action | |
| 1593. |
Borosilicate glassware is used in the microwave oven becauseA. It is not brittleB. It is highly heat resistantC. It cooks faster than any other vesselD. It is energy efficient |
| A. | D |
| B. | C |
| C. | B |
| D. | A |
| Answer» D. A | |
| 1594. |
Naturally occuring acid present in tamarind is ___________. |
| A. | Oxalic acid |
| B. | Ascorbic acid |
| C. | Tartaric acid |
| D. | Tannic acid |
| Answer» D. Tannic acid | |
| 1595. |
A mixture of 100 mmol of Ca(OH)2 and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of OH- in resulting solution, respectively, are:(Molar mass of Ca(OH)2, Na2 SO4, and CaSO4 are 74, 143, and 136 g mol-1 respectively; Ksp of Ca(OH)2 is 5.5 × 10-6) |
| A. | 13.6 g, 0.28 mol L-1 |
| B. | 1.9 g, 0.28 mol L-1 |
| C. | 13.6 g, 0.14 mol L-1 |
| D. | 1.9 g, 0.14 mol L-1 |
| Answer» C. 13.6 g, 0.14 mol L-1 | |
| 1596. |
Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as below. The radius of atom B is twice that of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficiency in solid 2? |
| A. | 45% |
| B. | 75% |
| C. | 90% |
| D. | 65% |
| Answer» D. 65% | |
| 1597. |
________ elements are present in the sixth period of the modern periodic table. |
| A. | 33 |
| B. | 18 |
| C. | 32 |
| D. | 8 |
| Answer» D. 8 | |
| 1598. |
Law of Triad was proposed by ________. |
| A. | Newland |
| B. | Rutherford |
| C. | Mendeleev |
| D. | Dobereiner |
| Answer» E. | |
| 1599. |
Match the following List - I List -IIA) PyrolusiteI) SulphideB) Horn silverII) SulphateC) CinnabarIII) SilicateD) GypsumIV) Oxide V) Halide |
| A. | A-V, B-IV, C-III, D-I |
| B. | A-IV, B- V, C-I, D-II |
| C. | A-IV, B-II, C-I, D-V |
| D. | A-II, B-III, C-IV, D-I |
| Answer» C. A-IV, B-II, C-I, D-V | |
| 1600. |
5.1 g NH4SH is introduced in 3.0L evacuated flask at 327°C. 30% of the solid NH4 SH decomposed to NH3 and H2 S as gases. The Kp of the reaction at 327°C is (R = 0.082 atm mol-1 K-1, molar mass of S = 32 g mol-1, molar mass of N = 14 g mol-1) |
| A. | 0.242 × 10-4) atm2 |
| B. | 0.242 atm2 |
| C. | 4.9 × 10-3 atm2 |
| D. | 1 × 10-4 atm2 |
| Answer» C. 4.9 × 10-3 atm2 | |