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.
| 1001. |
220 g of carbon dioxide contains _______ moles of co2. |
| A. | 5 |
| B. | 6 |
| C. | 3 |
| D. | 4 |
| Answer» B. 6 | |
| 1002. |
An element which is stored in water is: |
| A. | Phosphorus |
| B. | Zinc |
| C. | Sodium |
| D. | Potassium |
| Answer» B. Zinc | |
| 1003. |
Bauxite ore is concentrated by which of the following methods? |
| A. | Froth flotation |
| B. | Electromagnetic separation |
| C. | Hydraulic washing |
| D. | Leaching |
| Answer» E. | |
| 1004. |
Directions: The following 05 (Five) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the answers to these items using the code given below:Statement I: Petroleum is a mixture of many different hydrocarbons of different densities.Statement II: The grade of petroleum depends mainly on the relative proportion of the different hydrocarbons. |
| A. | Both the Statements are individually true and Statement II is the correct explanation of Statement I. |
| B. | Both the Statements are individually true but Statement II is not the correct explanation of Statement I. |
| C. | Statement I is true but Statement II is false. |
| D. | Statement I is false but Statement II is true. |
| Answer» B. Both the Statements are individually true but Statement II is not the correct explanation of Statement I. | |
| 1005. |
Among the following, whose calorific value is the highest? |
| A. | Biogas |
| B. | Hydrogen |
| C. | Methane |
| D. | LPG |
| Answer» C. Methane | |
| 1006. |
Choose the correct method which can be used to decompose water into its constituent elements. |
| A. | Sublimation |
| B. | Fractional distillation |
| C. | Electrolysis |
| D. | Distillation |
| Answer» D. Distillation | |
| 1007. |
Li shows diagonal relationship with- |
| A. | Na |
| B. | K |
| C. | Al |
| D. | Mg |
| Answer» E. | |
| 1008. |
An acid is a substance which:I. is sour in tasteII. turns red litmus paper into blue |
| A. | Only I is correct |
| B. | Only II is correct |
| C. | Both I and II |
| D. | None of these is correct |
| Answer» B. Only II is correct | |
| 1009. |
Hybridization of C2 and C3 of\({C^1}{H_3} - {C^2}H{ - ^3}C - {C^4}H - {C^5}{H_3}\) are |
| A. | sp sp3 |
| B. | sp2 sp |
| C. | sp2 sp2 |
| D. | sp sp |
| Answer» C. sp2 sp2 | |
| 1010. |
How many hydrogen atoms are there in a molecule of acetylene? |
| A. | 2 |
| B. | 4 |
| C. | 1 |
| D. | 3 |
| Answer» B. 4 | |
| 1011. |
Match List - I with List-II and select the correct Ans using the codes given below the lists:List-I[Applications]List-II[Substances](a) Aspartame(1) Synthetic rubber(b) Freon(2) Anti-histamine(c) Neoprene(3) Artificial Sweetener(d) Benadryl(4) Refrigerant |
| A. | a-1, b-3, c-4, d-2 |
| B. | a-2, b-4, c-1, d-3 |
| C. | a-3, b-4, c-1, d-2 |
| D. | a-3, b-1, c-2, d-4 |
| E. | None of the above/More than one of the above |
| Answer» D. a-3, b-1, c-2, d-4 | |
| 1012. |
.......... is a chemical process or a reaction between fuel (hydrocarbon) and oxygen producing heat and light energy resulting in a flame. |
| A. | Convection |
| B. | Carbonisation |
| C. | Combustion |
| D. | Conduction |
| Answer» D. Conduction | |
| 1013. |
In some machines, why is using oil as a lubricant not advisable? |
| A. | Oil makes the machine parts and the whole place dirty |
| B. | Oil sometimes increases friction |
| C. | Sometimes oil leaks into the parts of the machine causing undesirable obstruction of working |
| D. | Oil makes the movement of the parts tough |
| Answer» D. Oil makes the movement of the parts tough | |
| 1014. |
Quartz used in clocks is ________. |
| A. | Nitrogen silicate |
| B. | Silicon dioxide |
| C. | Sodium silicate |
| D. | Calcium silicate |
| Answer» C. Sodium silicate | |
| 1015. |
Atomic number of which of the following elements is greater than that of Barium. |
| A. | Iodine |
| B. | Silver |
| C. | Bromine |
| D. | Gold |
| Answer» E. | |
| 1016. |
Newlands’s law of octaves was applicable only up to _____. |
| A. | Potassium |
| B. | Calcium |
| C. | Chlorine |
| D. | Sulphur |
| Answer» C. Chlorine | |
| 1017. |
In the modern periodic table, elements having atomic numbers 11 to 18 are placed in the period: |
| A. | 2 |
| B. | 1 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 1018. |
Chemical formula of Plaster of Paris is - |
| A. | CaSO4 . 2H2O |
| B. | \(\left( {{\rm{CaS}}{{\rm{O}}_4}} \right).\frac{1}{2}{{\rm{H}}_2}{\rm{O}}\) |
| C. | Ca(NO3)2 |
| D. | Ca3(PO4)2 |
| Answer» C. Ca(NO3)2 | |
| 1019. |
Maximum co-valency of Sulphur is _____. |
| A. | 6 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» B. 2 | |
| 1020. |
Ethanoic Acid is commonly called ______ Acid. |
| A. | Citric |
| B. | Hydrochloric |
| C. | Acetic |
| D. | Nitric |
| Answer» D. Nitric | |
| 1021. |
Choose INCORRECT one for Aldehydes. |
| A. | C3H7COH → butanal → butyraldehyde |
| B. | CH3COH → ethanal → acetaldehyde |
| C. | C2H5COH → propanal → propionaldehyde |
| D. | CH2COH → methanol → formaldehyde |
| Answer» E. | |
| 1022. |
Bleaching powder is |
| A. | CaOCl |
| B. | CaOCl3 |
| C. | CaO2Cl |
| D. | CaO2Cl2 |
| Answer» E. | |
| 1023. |
A reaction of cobalt (III) chloride and ethylene diamine in a 1 : 2 mole ratio generates two isomeric products A (violet colored) and B (green colored). A can show optical activity, but B is optically inactive. What type of isomers does A and B represent? |
| A. | Ionization isomers |
| B. | Coordination isomers |
| C. | Geometrical isomers |
| D. | Linkage isomers |
| Answer» D. Linkage isomers | |
| 1024. |
At the end of the chemical reaction the catalyst remains |
| A. | Unchanged in quantity but changed in composition |
| B. | Unchanged in quantity and composition |
| C. | Unchanged in composition but changed in quantity |
| D. | Changed in quantity and composition |
| Answer» C. Unchanged in composition but changed in quantity | |
| 1025. |
By green chemistry, we mean |
| A. | Producing chemicals of our daily use from greenhouse gases |
| B. | Performing chemical processes which green plants |
| C. | Performing only those reactions which are of biological origin |
| D. | The use of non-toxic reagents and solvents to produce environmentally-friendly products |
| Answer» E. | |
| 1026. |
________ is the technique used for separating colours. |
| A. | Chromatography |
| B. | Sublimation |
| C. | Filtration |
| D. | Evaporation |
| Answer» B. Sublimation | |
| 1027. |
________ can be used as an olfactory indicator. |
| A. | Tamarind |
| B. | Amla |
| C. | Alum |
| D. | Vanilla |
| Answer» E. | |
| 1028. |
Air expands when it ______. |
| A. | is cooled |
| B. | is heated |
| C. | is under pressure |
| D. | becomes more humid |
| Answer» C. is under pressure | |
| 1029. |
Iodine test is used to check the presence of |
| A. | Cholesterol |
| B. | Fat |
| C. | Protein |
| D. | Carbohydrate |
| Answer» E. | |
| 1030. |
Molecular mass of Sulphurous acid is: |
| A. | 96.04 |
| B. | 98.07 |
| C. | 87.06 |
| D. | 82.07 |
| Answer» E. | |
| 1031. |
Mendeleev could not assign a correct position to which of the following elements in his tables? |
| A. | Lithium |
| B. | Potassium |
| C. | Hydrogen |
| D. | Helium |
| Answer» D. Helium | |
| 1032. |
In Modern Periodic Table, there is an anomaly when it comes to the position of ________ because it can be placed either in group 1 or group 17 in the first period. |
| A. | He |
| B. | H |
| C. | Li |
| D. | Be |
| Answer» C. Li | |
| 1033. |
If the de-Broglie wavelength of the electron in nth Bohr orbit in a hydrogenic atom is equal to 1.5πa0 (a0 is Bohr radius), then the value of n/Z is |
| A. | 1.0 |
| B. | 0.75 |
| C. | 0.40 |
| D. | 1.50 |
| Answer» C. 0.40 | |
| 1034. |
In the following compound, the favorable site/s for protonation is/are |
| A. | (a) and (e) |
| B. | (b), (c) and (d) |
| C. | (a) and (d) |
| D. | (a) |
| Answer» C. (a) and (d) | |
| 1035. |
Consider the following reaction:\(CH_4(g) + H_2O(g) \xrightarrow{1270 K} CO(g) + 3H_2(g)\)In the reaction given above, the mixture of CO ad H2 is: |
| A. | natural gas |
| B. | water gas |
| C. | producer gas |
| D. | industrial gas |
| Answer» C. producer gas | |
| 1036. |
Hydrogen bomb is based on |
| A. | Nuclear Fission |
| B. | Nuclear Fusion |
| C. | Decomposition |
| D. | Chemical Blast |
| Answer» C. Decomposition | |
| 1037. |
'Laughing gas' is chemically |
| A. | carbon dioxide |
| B. | nitrous oxide |
| C. | nitric oxide |
| D. | sulphur dioxide |
| Answer» C. nitric oxide | |
| 1038. |
Foam is used as fire extinguishers in the case of a |
| A. | Class A fire |
| B. | Class B fire |
| C. | Class C fire |
| D. | Ordinary fire |
| Answer» C. Class C fire | |
| 1039. |
How to express 20 g of CO2 in moles. (Atomic mass C = 12, O = 16) |
| A. | 4 mole |
| B. | 2 mole |
| C. | 1 mole |
| D. | 0.45 moles |
| Answer» E. | |
| 1040. |
Match the following.A. Dalton1. Hydrogen atomB. 10-10 m2. Latin name for potassiumC. Kalium3. First user of symbol for elements |
| A. | A - 3, B - 2, C - 1 |
| B. | A - 1, B - 2, C - 3 |
| C. | A - 3, B - 1, C - 2 |
| D. | A - 2, B - 3, C - 1 |
| Answer» D. A - 2, B - 3, C - 1 | |
| 1041. |
Elements on the right side of the Periodic Table are ____________? |
| A. | Semi Metals |
| B. | Metals |
| C. | Transition Metals |
| D. | Non Metals |
| Answer» E. | |
| 1042. |
Edible oil is extracted from which of the following? |
| A. | Cannabis |
| B. | Cotton |
| C. | Mustard |
| D. | Ratanjot |
| Answer» D. Ratanjot | |
| 1043. |
Gunpowder mainly contains________.A. Calcium sulfateB. Potassium nitrateC. Lead sulfideD. Zinc sulfide |
| A. | A |
| B. | B |
| C. | D |
| D. | C |
| Answer» C. D | |
| 1044. |
Blister copper is |
| A. | Pure copper |
| B. | Ore of copper |
| C. | Alloy of copper |
| D. | Copper with 2% impurities |
| Answer» E. | |
| 1045. |
25 g of an unknown hydrocarbon upon burning produces 88 g of CO2 and 9 g of H2O. This unknown hydrocarbon contains: |
| A. | 20 g of carbon and 5 g of hydrogen |
| B. | 22 g of carbon and 3 g of hydrogen |
| C. | 24 g of carbon and 1g of hydrogen |
| D. | 18 g of carbon and 7g of hydrogen |
| Answer» D. 18 g of carbon and 7g of hydrogen | |
| 1046. |
L.P.G is a mixture of |
| A. | methane and butane |
| B. | propane and butane |
| C. | ethane and propane |
| D. | ethane and butane |
| Answer» C. ethane and propane | |
| 1047. |
A crystalline hydrated salt on heating gives a residue 44.1% of its mass. The formula of that salt is: |
| A. | Na2SO4.7H2 O |
| B. | Na2SO4.10H2O |
| C. | Na2SO4.2H2O |
| D. | Na2SO4.5H2O |
| Answer» C. Na2SO4.2H2O | |
| 1048. |
Most of the explosions in mines occur due to the mixing of |
| A. | Hydrogen with oxygen |
| B. | Oxygen with acetylene |
| C. | Methane with air |
| D. | Carbon dioxide with ethane |
| Answer» D. Carbon dioxide with ethane | |
| 1049. |
Metal M can be displaced by metal N, but metal N cannot displace metal O from its salt solution. This means that the increasing order of their reactivity is |
| A. | O>M>N |
| B. | N< b> |
| C. | M< b> |
| D. | O< b> |
| Answer» D. O< b> | |
| 1050. |
How many molecules are present in one mole of water? |
| A. | 6.02 × 1026 molecules |
| B. | 7.02 × 1023 molecules |
| C. | 8.02 × 1022 molecules |
| D. | 6.02 × 1023 molecules |
| Answer» E. | |