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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.
| 1101. |
C60, an allotrope of carbon contains: |
| A. | 12 hexagons and 20 pentagons |
| B. | 18 hexagons and 14 pentagons |
| C. | 16 hexagons and 16 pentagons |
| D. | 20 hexagons and 12 pentagons |
| Answer» E. | |
| 1102. |
In the following reaction,\({\rm{Aldehyde\;}} + {\rm{\;Alcohol\;}}\mathop \to \limits^{{\rm{HCl}}} {\rm{\;Acetal\;}}\)Aldehyde AlcoholHCHO tBuOHCH3CHO MeOHThe best combination is |
| A. | CH3CHO and MeOH |
| B. | CH3CHO and tBuOH |
| C. | HCHO and MeOH |
| D. | HCHO and tBuOH |
| Answer» D. HCHO and tBuOH | |
| 1103. |
Ammonium nitrate, on thermal decomposition, produces: |
| A. | NH3 and NO |
| B. | N2O and H2O |
| C. | N2 and H2O |
| D. | NH3 and NO2 |
| Answer» C. N2 and H2O | |
| 1104. |
Magnesium hydroxide [Mg (OH)2] is used as— |
| A. | oxidizing agent |
| B. | reducing agent |
| C. | anti-acid |
| D. | fermentation agent |
| Answer» D. fermentation agent | |
| 1105. |
Blackening of silver articles is an example of _______. |
| A. | thermal decomposition |
| B. | corrosion |
| C. | rancidity |
| D. | combustion |
| Answer» C. rancidity | |
| 1106. |
In a combination reaction there can be ______.I. two or more than two reactantsII. two or more than two productsIII. only one product |
| A. | Only I |
| B. | Only I and III |
| C. | Only I and II |
| D. | Only II |
| Answer» C. Only I and II | |
| 1107. |
Metals can displace each other according to their ________. |
| A. | Conductivity |
| B. | Resistivity |
| C. | Testability |
| D. | Reactivity |
| Answer» E. | |
| 1108. |
Number of Neutrons in heavy hydrogen atom are ________. |
| A. | 0 |
| B. | 3 |
| C. | 1 |
| D. | 2 |
| Answer» D. 2 | |
| 1109. |
Match the following items of column (A) to items of column (B).Column AColumn B I. Polyester 1. Fabrics do not wrinkle easily II. Teflon 2. Used for making parachutes III. Rayon 3. Prepared by using wood pulp IV. Nylon 4. For non-stick coating on cook |
| A. | I – 2, II – 3, III – 1, IV – 4 |
| B. | I – 3, II – 1, III – 4, IV – 2 |
| C. | I – 2, II – 4, III – 1, IV – 3 |
| D. | I – 1, II – 4, III – 3, IV – 2 |
| Answer» E. | |
| 1110. |
Electroplating does not help ______. |
| A. | In giving shining appearance |
| B. | In protecting the metal against corrosion |
| C. | In making the metal hard |
| D. | In giving fine finish to the surface |
| Answer» D. In giving fine finish to the surface | |
| 1111. |
In the Hall-Heroult process, aluminum is formed at the cathode. The cathode is made out of |
| A. | Platinum |
| B. | Carbon |
| C. | Pure aluminum |
| D. | Copper |
| Answer» C. Pure aluminum | |
| 1112. |
Among the following, the molecule expected to be stabilized by anion formation is:C2, O2, NO, F2 |
| A. | C2 |
| B. | F2 |
| C. | NO |
| D. | O2 |
| Answer» B. F2 | |
| 1113. |
According to Mendeleev's periodic law, the physical and chemical properties of elements are periodic functions of their |
| A. | Atomic numbers |
| B. | Atomic weights |
| C. | Number of electrons |
| D. | Number of protons |
| Answer» C. Number of electrons | |
| 1114. |
An element has the electronic configuration 1s2, 2s22p6, 3s23p2. The number of its valence electron is- |
| A. | 4 |
| B. | 6 |
| C. | 2 |
| D. | 3 |
| Answer» B. 6 | |
| 1115. |
______ is used as a catalyst in the hydrogenation of vegetable oil. |
| A. | Lead |
| B. | Nickel |
| C. | Helium |
| D. | Hydrogen |
| Answer» C. Helium | |
| 1116. |
An atmospheric oxide of a metalloid present in 15th group. The possible electronic configuration of that metalloid is |
| A. | [Ar]3d10 4s24p3 |
| B. | [He] 2s22p3 |
| C. | [Ne] 3s2p3 |
| D. | [Xe] 4f14 5d10 6s2 6p3 |
| Answer» B. [He] 2s22p3 | |
| 1117. |
In the following reaction, which specifies is undergoing reduction?\(\rm 2C_2O_{(s)} + Cu_2S_{(s)} \xrightarrow{ \ \ \ \ \ \ \ \ } 6Cu_{(s)}+ SO_2\) |
| A. | Copper |
| B. | Sulphur |
| C. | Oxygen |
| D. | Sulphur di oxide |
| Answer» B. Sulphur | |
| 1118. |
_____ is not acidic. |
| A. | SbCl4 |
| B. | CCl4 |
| C. | PCl4 |
| D. | PCl3 |
| Answer» C. PCl4 | |
| 1119. |
An organic compound 'X' showing the following solubility profile is: |
| A. | o-Toluidine |
| B. | Oleic acid |
| C. | m-Cresol |
| D. | Benzamide |
| Answer» D. Benzamide | |
| 1120. |
Ostwald dilution law is applicable |
| A. | Only to weak electrolytes |
| B. | Only to strong electrolytes |
| C. | To all electrolytes |
| D. | To all acids and bases |
| Answer» B. Only to strong electrolytes | |
| 1121. |
______ is the formula for rust. |
| A. | Fe2OH xH2O |
| B. | FeO2 xH2O |
| C. | Fe2O3 xH2O |
| D. | Fe2O xH2O |
| Answer» D. Fe2O xH2O | |
| 1122. |
In chemistry, the carbonyl group is a functional group in which a carbon atom is _____ |
| A. | single-bonded to an oxygen atom |
| B. | single-bonded to a hydrogen atom |
| C. | double-bonded to a hydrogen atom |
| D. | double-bonded to an oxygen atom |
| Answer» E. | |
| 1123. |
______ is called quick lime. |
| A. | Calcium carbonate |
| B. | Calcium chloride |
| C. | Calcium hydroxide |
| D. | Calcium oxide |
| Answer» E. | |
| 1124. |
For the reaction,2SO2 (g) + O2 (g) ⇌ 2SO3 (g)ΔH = -57.2 kJmol-1 and Kc = 1.7 × 1016Which of the following statement is INCORRECT? |
| A. | The equilibrium constant is large suggestive of reaction going to completion and so no catalyst is required. |
| B. | The equilibrium will shift in forward direction as the pressure increases. |
| C. | The equilibrium constant decreases as the temperature increases. |
| D. | The addition of inert gas at constant volume will not affect the equilibrium constant. |
| Answer» B. The equilibrium will shift in forward direction as the pressure increases. | |
| 1125. |
Atoms of the same element having different mass numbers are called ________. |
| A. | Isotopes |
| B. | Nucleons |
| C. | Neutrons |
| D. | Transmutation |
| Answer» B. Nucleons | |
| 1126. |
Food is cooked faster in a pressure cooker because? |
| A. | Steam is hotter than the boiling water |
| B. | In the cooker water starts boiling at a lower temperature |
| C. | Heat cannot escape from the cooker |
| D. | Due to high pressure the boiling point of water is raised |
| Answer» E. | |
| 1127. |
______ is the only non-metal placed with alkali metals. |
| A. | Francium |
| B. | Hydrogen |
| C. | Rubidum |
| D. | Caesium |
| Answer» C. Rubidum | |
| 1128. |
How many atoms will one mole of Carbon (C – 12) contain? |
| A. | 6.02 × 1026 |
| B. | 60.20 × 1026 |
| C. | 8.06 × 1020 |
| D. | 6.02 × 1023 |
| Answer» E. | |
| 1129. |
________ elements have the largest atoms. |
| A. | F |
| B. | O |
| C. | H |
| D. | Li |
| Answer» E. | |
| 1130. |
L.P.G. is a hydrocarbon consisting of a minute of _____? |
| A. | Ethane and Propane |
| B. | Methane and Butane |
| C. | Ethane and Butane |
| D. | Propane and Butane |
| Answer» E. | |
| 1131. |
Elevation in the boiling point for 1 molal solution of glucose is 2K. The depression in the freezing point for 2 molal solution of glucose in the same solvent is 2K. The relation between Kb and Kf is |
| A. | Kb = 1.5 Kf |
| B. | Kb = 0.5Kf |
| C. | Kb = Kf |
| D. | Kb = 2Kf |
| Answer» E. | |
| 1132. |
A change of state directly from solid to gas without changing into liquid state is called |
| A. | Fusion |
| B. | Sublimation |
| C. | Diffusion |
| D. | Emulsion |
| Answer» C. Diffusion | |
| 1133. |
Opium is of which category medicine? |
| A. | Depressant |
| B. | Stimulant |
| C. | Hallucinogenic |
| D. | None of the above |
| Answer» B. Stimulant | |
| 1134. |
Equal volumes of all gases under the same conditions of temperature and pressure contain an equal number of molecules, This is |
| A. | Dalton's law |
| B. | Boyle's law |
| C. | Charles' law |
| D. | Avogadro's law |
| Answer» E. | |
| 1135. |
Consider the following pairs. Which one is correct?Name: Formula1 EthanolC2H6O2ButanolCH3 - O - CH2 - CH2 - OCH331 BromopropaneCH3CH2CH2Br41,2 DimethoxyethaneCH3 - CH(OH) - CH2 - CH3 |
| A. | 1 and 3 only |
| B. | 1 and 4 only |
| C. | 2 and 3 only |
| D. | 2, 3 and 4 only |
| Answer» B. 1 and 4 only | |
| 1136. |
Hard substance producing one non-metal and one soft metal respectively are |
| A. | C and Fe |
| B. | S and Na |
| C. | I and Pb |
| D. | C and Na |
| Answer» E. | |
| 1137. |
________ compound is used as a drying agent. |
| A. | Calcium oxide |
| B. | Calcium carbide |
| C. | Gypsum |
| D. | Calcium carbonate |
| Answer» B. Calcium carbide | |
| 1138. |
From the options given below, identify the substance which are sweet smelling ? |
| A. | Ketones |
| B. | Alcohols |
| C. | Esters |
| D. | Carboxylic acids |
| Answer» D. Carboxylic acids | |
| 1139. |
0.27 g of a long chain fatty acid was dissolved in 100 cm3 of hexane. 10 mL of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is 10 cm. What is the height of the monolayer?[Density of fatty acid = 0.9 g cm-3, π = 3] |
| A. | 10-6 m |
| B. | 10-8 m |
| C. | 10-2 m |
| D. | 10 -4 m |
| Answer» B. 10-8 m | |
| 1140. |
Match List - I with List-II and select the correct answer from the codes given below the lists:List - I(Compound)List – II(Colour)A. Urea1. BlueB. Hydrous copper sulphate2. WhiteC. Lead sulphide3. Pinkish purpleD. Potassium permanganate4. Black Code: |
| A. | A-2, B-1, C-4, D-3 |
| B. | A-2, B-4, C-1, D-3 |
| C. | A-3, B-4, C-1, D-2 |
| D. | A-3, B-1, C-4, D-2 |
| Answer» B. A-2, B-4, C-1, D-3 | |
| 1141. |
Methane is a colourless, odourless, non-toxic but flammable gas. What is its common name? |
| A. | Laughing gas |
| B. | Blue vitriol |
| C. | Heating gas |
| D. | Marsh gas |
| Answer» E. | |
| 1142. |
Malachite is an ore of - |
| A. | Manganese |
| B. | Magnesium |
| C. | Mercury |
| D. | Copper |
| Answer» E. | |
| 1143. |
95 °F = ____ °C |
| A. | 45 |
| B. | 35 |
| C. | 25 |
| D. | 15 |
| Answer» C. 25 | |
| 1144. |
Given,Gas: H2, CH4, CO2, SO2.Critical temperature/K: 33, 190, 304, 630.On the basis of data given above, predict which of the following gases shows the least adsorption on a definite amount of charcoal? |
| A. | CH4 |
| B. | SO2 |
| C. | CO2 |
| D. | H2 |
| Answer» E. | |
| 1145. |
Points I, II and III in the following plot respectively correspond to(Vmp: most probable velocity) |
| A. | Vmp of N2 (300 K); Vmp of O2 (400 K); Vmp of H2 (300 K) |
| B. | Vmp of O2 (400 K); Vmp of N2 (300 K); Vmp of H2 (300 K) |
| C. | Vmp of N2 (300 K); Vmp of H2 (300 K); Vmp of O2 (400 K) |
| D. | Vmp of H2 (300 K); Vmp of N2 (300 K); Vmp of O2 (400 K) |
| Answer» C. Vmp of N2 (300 K); Vmp of H2 (300 K); Vmp of O2 (400 K) | |
| 1146. |
Among the 4 common type of refrigerants which has the highest ozone depletion potential? |
| A. | CFCs |
| B. | HCFCs |
| C. | HFCs |
| D. | LTCs |
| Answer» B. HCFCs | |
| 1147. |
________ is used to control the fission reaction rate in a nuclear reactor as it absorbs neutron without itself getting into fissioning.A. Heavy waterB. GraphiteC. WaterD. Boron |
| A. | A |
| B. | D |
| C. | B |
| D. | C |
| Answer» C. B | |
| 1148. |
______ is known as Universal Solvent. |
| A. | Kerosene |
| B. | Alcohol |
| C. | Acetone |
| D. | Water |
| Answer» E. | |
| 1149. |
How many hydrogen atoms are there in a molecule of methane? |
| A. | 2 |
| B. | 6 |
| C. | 4 |
| D. | 3 |
| Answer» D. 3 | |
| 1150. |
Hinsberg’s reagent is: |
| A. | C6 H5 COCl |
| B. | SOCl2 |
| C. | C6 H5 SO2 Cl |
| D. | COCl2 |
| Answer» D. COCl2 | |