MCQOPTIONS
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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.
| 801. |
_______ is one of the most important technique for the separation of a mixture by passing it in solution or suspension through a medium in which the components move at different rates. |
| A. | Filtration |
| B. | Distillation |
| C. | Evaporation |
| D. | Chromatography |
| Answer» E. | |
| 802. |
In a reaction, what is the loss of hydrogen by substance called as? |
| A. | Reduction |
| B. | Oxidation |
| C. | Hydronization |
| D. | Both reduction and Hydronization |
| Answer» C. Hydronization | |
| 803. |
Not servicing the vehicles results in incomplete combustion of carbonaceous matter in automobile engine which generates: _________. |
| A. | Carbon monoxide |
| B. | Carbon dioxide |
| C. | Nitrous oxide |
| D. | Nitrogen dioxide |
| Answer» B. Carbon dioxide | |
| 804. |
An ‘Assertion’ and a ‘Reason’ are given below. Choose the correct answer from the following options:Assertion (A): Vinyl halides do not undergo nucleophilic substitution easily.Reason (R): Even though the intermediate carbocation is stabilized by loosely held π-electron, the cleavage is difficult because of strong bonding. |
| A. | Both (A) and (R) are wrong statement. |
| B. | Both (A) and (R) are correct statement and (R) is the correct explanation of (A) |
| C. | Both (A) and (R) are correct statement but (R) is not the correct explanation of (A) |
| D. | (A) is a correct statement but (R) is a wrong statement |
| Answer» E. | |
| 805. |
Which of the following may be a possible pH value of an acidic solution? |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 9 |
| Answer» B. 7 | |
| 806. |
In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic? |
| A. | NO → NO+ |
| B. | N2 → N2+ |
| C. | O2 → O2+ |
| D. | O2 → O22- |
| Answer» B. N2 → N2+ | |
| 807. |
How many electrons are there in the last orbit of Chlorine? |
| A. | 7 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» B. 1 | |
| 808. |
Cooking gas (LPG) mainly consists of- |
| A. | Ethene |
| B. | Ethyne |
| C. | Propene |
| D. | Propane and Butane |
| Answer» E. | |
| 809. |
Amylopectin is composed of: |
| A. | α-D-glucose, C1 – C4 and C1 – C6 linkage |
| B. | β-D-glucose, C1 – C4 and C2 – C6 linkage |
| C. | β-D-glucose, C1 – C4 and C1 – C6 linkage |
| D. | α-D-glucose, C1 – C4 and C2 – C6 linkage |
| Answer» B. β-D-glucose, C1 – C4 and C2 – C6 linkage | |
| 810. |
Lower amines can be prepared from amines through |
| A. | Wurtz reaction |
| B. | Schmidt reaction |
| C. | Hofmann bromamide reaction |
| D. | Mannich reaction |
| Answer» D. Mannich reaction | |
| 811. |
In the modern periodic table, elements having atomic numbers 19 to 36 are placed in the period _________. |
| A. | 4 |
| B. | 6 |
| C. | 5 |
| D. | 3 |
| Answer» B. 6 | |
| 812. |
Match List-I with List-II and select the correct answer using the code given below the Lists:List - I (Compound) List-II (Use)A. Boric acid1. AntisepticB. Citric acid2. Food PreservativeC. Magnesium hydroxide3. AntacidD. Acetic acid4. PickleCode: |
| A. | A-1, B-2, C-3, D-4 |
| B. | A-1, B-3, C-2, D-4 |
| C. | A-4, B-3, C-2, D-1 |
| D. | A-4, B-2, C-3, D-1 |
| Answer» B. A-1, B-3, C-2, D-4 | |
| 813. |
Chlorofluorocarbons which degrade ozone layer are used in which of the following? |
| A. | Antifreeze |
| B. | Antioxidant |
| C. | Refrigerants |
| D. | Reducing agent |
| Answer» D. Reducing agent | |
| 814. |
Fructose and glucose can be distinguished by: |
| A. | Benedict's test |
| B. | Fehling's test |
| C. | Barfoed's test |
| D. | Seliwanoff's test |
| Answer» E. | |
| 815. |
NaH is an example of |
| A. | Metallic hydride |
| B. | Electron-rich hydride |
| C. | Saline hydride |
| D. | Molecular hydride |
| Answer» D. Molecular hydride | |
| 816. |
Alcoholic Drink contains ? |
| A. | Methyl Alcohol |
| B. | Ethyl Alcohol |
| C. | Propyl Alcohol |
| D. | Butyl Alcohol |
| Answer» C. Propyl Alcohol | |
| 817. |
Match the ores (Column A) with the metals (Column B)Column AOresColumn BMetalsA. SideriteP. ZincB KaoliniteQ. CopperC. MalachiteR. IronD. CalamineS. Aluminium |
| A. | A → P; B → Q; C → R; D → S |
| B. | A → R; B → S; C → P; D → Q |
| C. | A → Q; B → R; C → S; D→ P |
| D. | A → R; B → S; C → Q; D → P |
| Answer» E. | |
| 818. |
'Malleable' refers to the property of ________.A. Non-metalB. MetalC. GasD. Non-metal compounds |
| A. | A |
| B. | D |
| C. | C |
| D. | B |
| Answer» E. | |
| 819. |
In a chemical reaction, \(A\:+2B \overset{k}{\rightleftharpoons} 2C\:+D\), the initial concentration of B was 1.5 times of the concentration of A, but the equilibrium concentrations of A and B were found to be equal. The equilibrium constant (K) for the aforesaid chemical reaction is |
| A. | \(\frac{1}{4}\) |
| B. | 16 |
| C. | 1 |
| D. | 4 |
| Answer» E. | |
| 820. |
An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centers of two nearest tetrahedral voids in the lattice is: |
| A. | \(\sqrt 2 {\rm{a}}\) |
| B. | a |
| C. | \(\frac{a}{2}\) |
| D. | \(\frac{3}{2}{\rm{a}}\) |
| Answer» D. \(\frac{3}{2}{\rm{a}}\) | |
| 821. |
On continuous exposure to air, sodium finally changes to |
| A. | NaCl |
| B. | Na2CO3 |
| C. | Na2O |
| D. | Na2O2 |
| Answer» D. Na2O2 | |
| 822. |
Cinnabar (HgS) is an ore of which metal? |
| A. | Aluminum |
| B. | Mercury |
| C. | Gold |
| D. | Silver |
| Answer» C. Gold | |
| 823. |
Pick out the non metal which is a liquid at room temperature ? |
| A. | Phosphorous |
| B. | Bromine |
| C. | Iodine |
| D. | Carbon |
| Answer» C. Iodine | |
| 824. |
ΔH of adsorption is always: |
| A. | zero |
| B. | negative |
| C. | positive |
| D. | infinite |
| Answer» C. positive | |
| 825. |
Atoms of the same element or of different elements can join together to form a/an ________. |
| A. | Electron |
| B. | Proton |
| C. | Molecule |
| D. | Ion |
| Answer» D. Ion | |
| 826. |
A chemical reaction in which heat is generated is called a/an ________. |
| A. | endothermic reaction |
| B. | exothermic reaction |
| C. | combustion reaction |
| D. | displacement reaction |
| Answer» C. combustion reaction | |
| 827. |
In ethane, each carbon atom is bonded to _______ hydrogen atoms.: |
| A. | One |
| B. | Three |
| C. | Five |
| D. | Four |
| Answer» C. Five | |
| 828. |
Correct electronic configuration of chromium (Cr) is - |
| A. | 3d44s2 |
| B. | 3d54s1 |
| C. | 3d34s2 |
| D. | 3d44s1 |
| Answer» C. 3d34s2 | |
| 829. |
______ element has three orbits with 8 electrons in the outer shell. |
| A. | Xe |
| B. | Kr |
| C. | Ar |
| D. | Ne |
| Answer» D. Ne | |
| 830. |
In the modern periodic table, when we go from left to right in a particular period, the size of atoms generally |
| A. | Decreases |
| B. | Increases |
| C. | Either decreases or increases |
| D. | Does not change |
| Answer» B. Increases | |
| 831. |
Elements A, B and C occur as Dobereiner’s triads. If the atomic mass of A is 40 and that of C is 137, what will be the atomic mass of B? |
| A. | 35 |
| B. | 120 |
| C. | 88 |
| D. | 74 |
| Answer» D. 74 | |
| 832. |
A stain of curry on a white cloth become reddish brown when soap is used because the soap is: |
| A. | Neutral in nature |
| B. | Acidic in nature |
| C. | Basic in nature |
| D. | None of these |
| Answer» D. None of these | |
| 833. |
Air is a _______A. Pure compound.B. Mixture of only compounds.C. Mixture of only elements.D. Mixture of both elements and compounds. |
| A. | D |
| B. | A |
| C. | B |
| D. | C |
| Answer» B. A | |
| 834. |
Consider the following reversible chemical reactions:\({A_2}\left( g \right)\; + \;{B_2}\left( g \right)\begin{array}{*{20}{c}}{{K_1}}\\ \rightleftharpoons\end{array}\;2AB\left( g \right)\) …. (1)\(6AB\left( g \right)\;\begin{array}{*{20}{c}}{{K_2}}\\ \rightleftharpoons\end{array}3{A_2}\left( g \right) + 3{B_2}\left( g \right)\) …. (2)The relation between K1 and K2 is: |
| A. | \({K_1}{K_2} = \frac{1}{3}\) |
| B. | \({\rm{\;}}{K_2} = K_1^3\) |
| C. | \({\rm{\;}}{K_2} = K_1^{ - 3}\) |
| D. | K1 K2 = 3 |
| Answer» D. K1 K2 = 3 | |
| 835. |
It would be less safe to fill a gas balloon with the following gas: |
| A. | Nitrogen |
| B. | Air |
| C. | Hydrogen |
| D. | Helium |
| Answer» D. Helium | |
| 836. |
A mixture of sodium chloride (salt) and ammonium chloride can be separated by _________. |
| A. | sublimation |
| B. | filtration |
| C. | chromatography |
| D. | distillation |
| Answer» B. filtration | |
| 837. |
Carborundum is used as an abrasive, because it |
| A. | has high thermal conductivity |
| B. | has low coefficient of expansion |
| C. | has high chemical stability |
| D. | is extremely hard |
| Answer» E. | |
| 838. |
In view of environmental problems, the use of which insecticide has been reduced ? |
| A. | Gammexane |
| B. | Endosulfan |
| C. | Mancozeb |
| D. | Phorate |
| Answer» B. Endosulfan | |
| 839. |
Radioactive disintegration of uranium ultimately results in formation of |
| A. | Radium |
| B. | Thorium |
| C. | Polonium |
| D. | Lead |
| Answer» B. Thorium | |
| 840. |
3.7 kg of a fuel is completely burnt to give off 1.665 × 108 joules of energy. The calorific value of the fuel in standard unit is |
| A. | 45000 |
| B. | 22222 |
| C. | 61605 |
| D. | 25000 |
| Answer» B. 22222 | |
| 841. |
Match the following: SlNatureSlSubstance1AcidicaDistill water2BasicbCarbonated drink3NeutralcSoap |
| A. | 1 – a, 2 – c, 3 – b |
| B. | 1 – b, 2 – c, 3 – a |
| C. | 1 – a, 2 – b, 3 – c |
| D. | 1 – c, 2 – a, 3 – b |
| Answer» C. 1 – a, 2 – b, 3 – c | |
| 842. |
Process of Coating of iron with zinc to protect it from rusting is known as ______. |
| A. | Sedimentation |
| B. | Neutralisation |
| C. | Galvanisation |
| D. | Salinization |
| Answer» D. Salinization | |
| 843. |
‘God Particle’ is |
| A. | Neutrino |
| B. | Higgs Boson |
| C. | Meson |
| D. | Positron |
| E. | None of the above/More than one of the above |
| Answer» C. Meson | |
| 844. |
A very large volume of hydrogen can be accommodated by making__________. |
| A. | non-metallic hydrides |
| B. | hydrogen peroxide |
| C. | non-stoichiometric hydrides |
| D. | alkali metal hydrides |
| Answer» D. alkali metal hydrides | |
| 845. |
Oxalic acid is found in which of the following? |
| A. | Amla |
| B. | Lemon |
| C. | Spinach |
| D. | Tamarind |
| Answer» D. Tamarind | |
| 846. |
Calcium sulphate dihydrate is commonly known as ________. |
| A. | glass |
| B. | asbestos |
| C. | limestone |
| D. | gypsum |
| Answer» E. | |
| 847. |
Acids that contain Hydrogen and other non-metallic elements, except Oxygen, are called: |
| A. | Strong acids |
| B. | Weak acids |
| C. | Hydracids |
| D. | Dilute acids |
| Answer» D. Dilute acids | |
| 848. |
In water molecule oxygen is |
| A. | sp-hybridized |
| B. | sp2-hybridized |
| C. | sp3-hybridized |
| D. | Not hybridized |
| Answer» D. Not hybridized | |
| 849. |
A colourless poisonous gas, which develops during bluming of coal, is _____? |
| A. | Methane |
| B. | Nitrogen |
| C. | Carbon Dioxide |
| D. | Carbon Monoxide |
| Answer» E. | |
| 850. |
pH of the human blood is ________. |
| A. | Slightly Acidic |
| B. | Highly Acidic |
| C. | Slightly Basic |
| D. | Highly Basic |
| Answer» D. Highly Basic | |