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.
| 1901. |
A sample of 'soft soap' contains |
| A. | Caesium |
| B. | Potassium |
| C. | Calcium |
| D. | Magnesium |
| Answer» C. Calcium | |
| 1902. |
During compression of a spring the work done is 10 KJ and 2 KJ escaped to the surrounding as heat. The change in internal energy, ∆U (in KJ) is: |
| A. | -12 |
| B. | -8 |
| C. | 8 |
| D. | 12 |
| Answer» D. 12 | |
| 1903. |
Pencil 'lead' is called ________. |
| A. | Charcoal |
| B. | Graphite |
| C. | Manganese |
| D. | Lampblack |
| Answer» C. Manganese | |
| 1904. |
In which one of the following reactions, the maximum quantity of H2 gas is produced by the decomposition of 1 g of compound by H2O/O2? |
| A. | CH4 + H2O → CO + 3H2 |
| B. | CO + H2O → CO2 + H2 |
| C. | \(C{H_4} + \frac{1}{2}{O_2} \to CO + 2{H_2}\) |
| D. | C12H24 + 6O2 → 12CO + 12H2 |
| Answer» B. CO + H2O → CO2 + H2 | |
| 1905. |
Match the following and select the correct code.A) Quick limeP) Co(NH2)2B) Slaked limeQ) Na2CO3C) UreaR) CaOD) Washing sodaS) Ca(OH)2 A. A-S, B-R, C-P, D-QB. A-R, B-S, C-Q, D-PC. A-R, B-S, C-P, D-QD. A-S, B-R, C-Q, D-P |
| A. | C |
| B. | B |
| C. | A |
| D. | D |
| Answer» B. B | |
| 1906. |
Identify the correct statement for metals |
| A. | Metals produce basic oxides when dissolved in water. |
| B. | Metals and non-metals produce acidic oxides when dissolved in water. |
| C. | Metals produce acidic oxides when dissolved in water. |
| D. | Non-metals produce basic oxides when dissolved in water. |
| Answer» B. Metals and non-metals produce acidic oxides when dissolved in water. | |
| 1907. |
Glucose is converted to ethyl alcohol by the enzyme |
| A. | maltase |
| B. | invertase |
| C. | zymase |
| D. | diastase |
| E. | None of the above / More than one of the above |
| Answer» D. diastase | |
| 1908. |
For the equilibrium2H2O ⇌ H3O+ + OH-, the value of ΔG° at 298K is approximately |
| A. | -80 kJ mol-1 |
| B. | 100 kJ mol-1 |
| C. | 80 kJ mol-1 |
| D. | -100 kJ mol-1 |
| Answer» D. -100 kJ mol-1 | |
| 1909. |
Amongst the following elements which have the largest atomic size? |
| A. | Magnesium |
| B. | Phosphorus |
| C. | Lithium |
| D. | Sodium |
| Answer» E. | |
| 1910. |
According to Rutherford the radius of the nucleus is about ________ than the radius of the atom. |
| A. | 105 times greater |
| B. | 105 times lesser |
| C. | 109 times greater |
| D. | 107 times greater |
| Answer» C. 109 times greater | |
| 1911. |
A process has ΔH = 200 Jmol-1 and ΔS = 40 JK-1 mol-1. Out of the values given below, choose the minimum temperature above which the process will be spontaneous |
| A. | 20 K |
| B. | 4 K |
| C. | 5 K |
| D. | 12 K |
| Answer» D. 12 K | |
| 1912. |
A/an ________ flame is produced when the oxygen supply is sufficient. |
| A. | Orange |
| B. | Red |
| C. | Green |
| D. | Blue |
| Answer» E. | |
| 1913. |
In O2F2 the oxidation number of oxygen is: |
| A. | -2 |
| B. | +1 |
| C. | +2 |
| D. | -1 |
| Answer» C. +2 | |
| 1914. |
Malachite is an ore of copper. Its composition is - Identify |
| A. | CuCO3 |
| B. | CuCl2.CuCO3 |
| C. | CuCO3.Cu(OH)2 |
| D. | Cu(OH)2 |
| Answer» D. Cu(OH)2 | |
| 1915. |
Metals have __________. |
| A. | High melting and boiling point |
| B. | Low melting and boiling point |
| C. | High melting and low boiling point |
| D. | Low melting and high boiling point |
| Answer» B. Low melting and boiling point | |
| 1916. |
For the following reaction, the mass of water produced from 445 g of C57 H10 O6 (g) is2C57 H110 O6 (s) + 163O2 (g) → 114CO2 (g) + 110H2O (l) |
| A. | 490 g |
| B. | 445 g |
| C. | 495 g |
| D. | 890 g |
| Answer» D. 890 g | |
| 1917. |
Phosphorus is stored in which among the following to prevent its contact from atmospheric oxygen? |
| A. | Kerosene |
| B. | Petroleum |
| C. | Water |
| D. | Aqua Regia |
| Answer» D. Aqua Regia | |
| 1918. |
In an alloy of German silver, the ratio of copper to zinc was 21 : 16 while that of nickel to zinc was 7 : 24 What was the ratio of copper to zinc to nickel in the alloy? |
| A. | 21 : 16 : 7 |
| B. | 17 : 21 : 4 |
| C. | 63 : 48 : 14 |
| D. | 68 : 28 : 21 |
| Answer» D. 68 : 28 : 21 | |
| 1919. |
Calcium has 20 electrons and 20 neutrons and Argon has 18 protons and 22 neutrons. What is similar between them? |
| A. | Mass number |
| B. | Number of valence electrons |
| C. | Atomic number |
| D. | Atomic mass |
| Answer» B. Number of valence electrons | |
| 1920. |
Matter around us can exist in three different stats, namely, solid, liquid and gas. The correct order of their compressibility is |
| A. | Liquid < Gas < Solid |
| B. | Solid < Liquid < Gas |
| C. | Gas < Liquid < Solid |
| D. | Solid < Gas < Liquid |
| Answer» C. Gas < Liquid < Solid | |
| 1921. |
Carnotite is an ore/mineral of ______. |
| A. | Beryllium |
| B. | Chromium |
| C. | Uranium |
| D. | Copper |
| Answer» D. Copper | |
| 1922. |
According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______. |
| A. | molecule |
| B. | atom |
| C. | compound |
| D. | element |
| Answer» C. compound | |
| 1923. |
Nitrous Oxide is the chemical name of ________. |
| A. | Mosquito Repellent |
| B. | Fire Extinguisher |
| C. | Laughing Gas |
| D. | Tear Gas |
| Answer» D. Tear Gas | |
| 1924. |
On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compound? |
| A. | Copper carbonate |
| B. | Copper oxide |
| C. | Copper sulphate |
| D. | Copper nitrate |
| Answer» B. Copper oxide | |
| 1925. |
Ethane and Ethyne may be distinguished by |
| A. | Bavers reagent |
| B. | Fehlings solution |
| C. | Tollen's reagent |
| D. | Alkaline water |
| Answer» D. Alkaline water | |
| 1926. |
Modern periodic law was given by- |
| A. | Dalton |
| B. | Mendeleev |
| C. | Dobereiner |
| D. | Mosley |
| Answer» E. | |
| 1927. |
In the process of _______, the iron is protected by a coating of zinc. |
| A. | Greasing |
| B. | Alloying |
| C. | Galvanization |
| D. | Anodising |
| Answer» D. Anodising | |
| 1928. |
Diborane (B2H6) reacts independently with O2 and H2O to produce, respectively: |
| A. | B2O3 and H3BO3 |
| B. | B2O3 and [BH4]– |
| C. | H3BO3 and B2O3 |
| D. | HBO2 and H3BO3 |
| Answer» B. B2O3 and [BH4]– | |
| 1929. |
Atomic numbers of Actinoides are from _____. |
| A. | 57 - 70 |
| B. | 58 - 71 |
| C. | 89 - 103 |
| D. | 89 - 102 |
| Answer» D. 89 - 102 | |
| 1930. |
68 degree Fahrenheit is equal to how many degrees Centigrade? |
| A. | 16 |
| B. | 20 |
| C. | 24 |
| D. | 10 |
| Answer» C. 24 | |
| 1931. |
Clothes are not washed well in hard water because- |
| A. | Water is hard to touch. |
| B. | Hard water contains insufficient salts that speed up the cleansing process. |
| C. | The soap reacts to salts and form scum instead of attacking to dirt particle. |
| D. | Hard water is heavy |
| Answer» D. Hard water is heavy | |
| 1932. |
Electronic configuration of hydrogen resembles that of ________. |
| A. | Halogens |
| B. | Alkali metals |
| C. | Alkaline earth metals |
| D. | Inert gases |
| Answer» C. Alkaline earth metals | |
| 1933. |
_______ is one of the liquids commonly used in liquid-in-glass thermometers. |
| A. | Liquid hydrogen |
| B. | Liquid nitrogen |
| C. | Alcohol |
| D. | Water |
| Answer» D. Water | |
| 1934. |
Litmus solution is a violet dye, which is extracted from ______. |
| A. | Rixia |
| B. | Moss |
| C. | Lichen |
| D. | Spirogyra |
| Answer» D. Spirogyra | |
| 1935. |
Aqua regia is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid. What is the ratio of this mixture? |
| A. | 2 : 1 |
| B. | 2 : 3 |
| C. | 2 : 2 |
| D. | 3 : 1 |
| Answer» E. | |
| 1936. |
Cinnabar is an ore of ______. |
| A. | Pb |
| B. | Sn |
| C. | Hg |
| D. | Ag |
| Answer» D. Ag | |
| 1937. |
Food containing oil and fat, when kept for a longer time, causes a change in its taste and smell due to the process of __________. |
| A. | decomposition |
| B. | fermentation |
| C. | rancidity |
| D. | substitution |
| Answer» D. substitution | |
| 1938. |
A ion, atom or a molecule capable of functioning as an electron donor is called as ________. |
| A. | chelates |
| B. | ligand |
| C. | complex ion |
| D. | central metal atom |
| Answer» C. complex ion | |
| 1939. |
5 Moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If Cv = 28 JK-1 mol-1, calculate ∆U and ∆pV for this process. (R = 8.0 JK-1 mol-1) |
| A. | ∆U = 14 kJ; ∆(pV) = 18 kJ |
| B. | ∆U = 14 J; ∆(pV) = 0.8 J |
| C. | ∆U = 14 kJ; ∆(pV) = 4 kJ |
| D. | ∆U = 28 kJ; ∆(pV) = 0.8 kJ |
| Answer» D. ∆U = 28 kJ; ∆(pV) = 0.8 kJ | |
| 1940. |
Oxygen is absent in |
| A. | kerosene |
| B. | glass |
| C. | soil |
| D. | cement |
| E. | None of the above / More than one of the above |
| Answer» B. glass | |
| 1941. |
A given mass of water has its maximum density at |
| A. | 0° C |
| B. | 0 K |
| C. | 4 °C |
| D. | 4 K |
| Answer» D. 4 K | |
| 1942. |
Iso-electronic ions among the following. |
| A. | N3-, O2-, F- |
| B. | N3-, O2-, Ca2+ |
| C. | N3-, S2-, Br- |
| D. | S2-, N3-, Cl- |
| Answer» B. N3-, O2-, Ca2+ | |
| 1943. |
Acids are NOT ______. |
| A. | electrolytes |
| B. | soapy to touch |
| C. | commonly used |
| D. | sour to taste |
| Answer» C. commonly used | |
| 1944. |
How much CO2 is produced on heating of 1 kg of carbon? |
| A. | 11/3 kg |
| B. | 3/11 kg |
| C. | 4/3 kg |
| D. | 3/4 kg |
| Answer» B. 3/11 kg | |
| 1945. |
An element has an atomic number of 20 with which of the following elements will it show similar chemical properties. |
| A. | Be(4) |
| B. | Fe(26) |
| C. | Sc(21) |
| D. | B(5) |
| Answer» B. Fe(26) | |
| 1946. |
Blue litmus when added to an acidic solution changes to- |
| A. | Red |
| B. | White |
| C. | Violet |
| D. | Green |
| Answer» B. White | |
| 1947. |
Given below are two statements, one is labelled as Assertion (A) and other as Reason (R):Assertion (A): Invert sugar is more sweeter than sucrose.Reason (R): Invert sugar is obtained by the hydrolysis of sucrose.Select the correct answer from the codes given below. |
| A. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| B. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
| C. | (A) is true but (R) is false |
| D. | (A) is false but (R) is true |
| Answer» C. (A) is true but (R) is false | |
| 1948. |
Among the following which of the following elements has the lowest melting point |
| A. | Bromine |
| B. | Zinc |
| C. | Lead |
| D. | Calcium |
| Answer» B. Zinc | |
| 1949. |
Lime water becomes milky due to which of the following gases? |
| A. | CO2 |
| B. | O2 |
| C. | NO2 |
| D. | N2 |
| Answer» B. O2 | |
| 1950. |
_____________ solutions has two components. |
| A. | Binary |
| B. | Ternary |
| C. | Super |
| D. | Bromine |
| Answer» B. Ternary | |