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.
| 1701. |
Out of the allotropes of which element one is an insulator second one is a poor conductor and third one is a super conductor of electricity ? |
| A. | C |
| B. | P |
| C. | As |
| D. | Sb |
| Answer» B. P | |
| 1702. |
In any atom, the number of electrons in the last orbit (valence orbit) is limited to |
| A. | 12 |
| B. | 10 |
| C. | 8 |
| D. | 4 |
| Answer» D. 4 | |
| 1703. |
Formation of which compound makes lime water milky when carbon dioxide is passed through it? |
| A. | Calcium bicarbonate |
| B. | Calcium oxide |
| C. | calcium sulphate |
| D. | Calcium carbonate |
| Answer» C. calcium sulphate | |
| 1704. |
Among the following, the energy of 2s orbital is lowest in: |
| A. | K |
| B. | H |
| C. | Li |
| D. | Na |
| Answer» B. H | |
| 1705. |
In CO2, C and O2 are present in the ratio ______ by mass |
| A. | 1 : 8 |
| B. | 8 : 1 |
| C. | 8 : 3 |
| D. | 3 : 8 |
| Answer» E. | |
| 1706. |
Liquid water is denser than ice due to |
| A. | higher surface tension |
| B. | hydrogen bonding |
| C. | van der Waals forces |
| D. | covalent bonding |
| Answer» C. van der Waals forces | |
| 1707. |
Daniel cell consists of |
| A. | Zn and Cu as electrodes |
| B. | Zn and Fe as electrodes |
| C. | An and Si as electrodes |
| D. | An and Ag as electrodes |
| Answer» B. Zn and Fe as electrodes | |
| 1708. |
Drug which reduce fever is known as |
| A. | Barbiturates |
| B. | Antiseptic |
| C. | Antipyretic |
| D. | Antibiotic |
| Answer» D. Antibiotic | |
| 1709. |
In which of the following compounds, the oxidation number of oxygen is +2? |
| A. | OF2 |
| B. | Na2O |
| C. | NaO2 |
| D. | NaO3 |
| Answer» B. Na2O | |
| 1710. |
Aqua Regia is a mixture of |
| A. | Three parts of concentrated nitric acid and two parts of concentrated hydrochloric acid |
| B. | Three parts of concentrated hydrochloric acid and one part of concentrated nitric acid |
| C. | Three parts of dilute hydrochloric acid and one part of dilute nitric acid |
| D. | Three parts of dilute nitric acid and one part of dilute hydrochloric acid |
| Answer» C. Three parts of dilute hydrochloric acid and one part of dilute nitric acid | |
| 1711. |
How many atoms does a molecule of oxygen contain? |
| A. | 3 |
| B. | 4 |
| C. | 2 |
| D. | 5 |
| Answer» D. 5 | |
| 1712. |
Pyrrhotite is an ore/mineral of |
| A. | Lead |
| B. | Nickel |
| C. | Gold |
| D. | Tin |
| Answer» C. Gold | |
| 1713. |
Bleaching action of Chlorine is due to which reaction? |
| A. | Oxidation |
| B. | Hydrolysis |
| C. | Redox |
| D. | Decomposition |
| Answer» B. Hydrolysis | |
| 1714. |
An ionic bond is formed by ______. |
| A. | Attraction of oppositely charged ions |
| B. | The combining atoms lose electrons |
| C. | Two metallic elements react |
| D. | Sharing of electrons takes place |
| Answer» B. The combining atoms lose electrons | |
| 1715. |
In _____, the connective electrons of the elements increase when going from one side to the other. |
| A. | Class |
| B. | Line |
| C. | Period |
| D. | Group |
| Answer» E. | |
| 1716. |
Fill in the blank with the most appropriate option.Ethanol is denatured to ______. |
| A. | Make it unsuitable for drinking |
| B. | Make it suitable as an antiseptic |
| C. | Make it suitable for drinking |
| D. | Increase its stability |
| Answer» B. Make it suitable as an antiseptic | |
| 1717. |
Match the correct pair/pairs:PollutantIndustryI. Tertiary ammonium saltSoap IndustryII. Bleaching liquorPaper and Pulp IndustryIII. Cellulose fibresPharmaceuticals Industry |
| A. | Only I |
| B. | Only II |
| C. | Only III |
| D. | Both I and II |
| Answer» E. | |
| 1718. |
In the modern periodic table while going from top to bottom in a group ______. |
| A. | the size of an atom increases |
| B. | the size of an atom decreases |
| C. | ionisation energy of an atom increases |
| D. | size and ionisation energy of an atom increases |
| Answer» B. the size of an atom decreases | |
| 1719. |
If the total energy of the reactants is more than the products of the reaction, heat is released and the reaction is said to be a/an ____ reaction. |
| A. | exothermic |
| B. | potential |
| C. | endothermic |
| D. | work |
| Answer» D. work | |
| 1720. |
Brass gets discoloured because of the presence of which of the following gases in air? |
| A. | Oxygen |
| B. | Hydrogen sulphide |
| C. | Carbon dioxide |
| D. | Nitrogen |
| Answer» C. Carbon dioxide | |
| 1721. |
At nearly 70°C, sodium bicarbonate shows the property of gradually decomposing, which makes it usable in bakery products. The product of decomposition responsible for this use of sodium bicarbonate is |
| A. | Carbon dioxide |
| B. | Hydrogen |
| C. | Water vapour |
| D. | Oxygen |
| Answer» B. Hydrogen | |
| 1722. |
Bakelite is what type of polymer? |
| A. | Thermosetting polymer |
| B. | Thermoplastic polymer |
| C. | Fibre |
| D. | Elastomer |
| Answer» B. Thermoplastic polymer | |
| 1723. |
Match List-I and List-II and select the correct answer using the code given below the Lists:List-I (Element) List-II (Property/Use)A.Mg1. Gives red colour to a flame.B.Ca2. Sulphate compound used in medicine to examine the alimentary canal of a patient.C.Sr3. Traps the energy of sunlight photosynthesis.D.Ba4. Control of muscle contraction. |
| A. | A-2, B-4, C-1, D-3 |
| B. | A-2, B-1, C-4, D-3 |
| C. | A-3, B-4, C-1, D-2 |
| D. | A-3, B-1, C-4, D-2 |
| Answer» D. A-3, B-1, C-4, D-2 | |
| 1724. |
_______ is the tissue consisting mainly of fat cells. |
| A. | Cardiac tissue |
| B. | Reticular tissue |
| C. | Epithelial tissue |
| D. | Adipose tissue |
| Answer» E. | |
| 1725. |
________ kills the germs present in the water. |
| A. | Evaporation |
| B. | Rehydration |
| C. | Boiling |
| D. | Desiccation |
| Answer» D. Desiccation | |
| 1726. |
A positive catalyst is a substance that ______ the rate of chemical reactions. |
| A. | first increases, but decreases later |
| B. | increases |
| C. | decreases |
| D. | keeps remain unchanged |
| Answer» C. decreases | |
| 1727. |
Out of all known elements, the minimum number is of _________ in the periodic table. |
| A. | Metals |
| B. | Non-metals |
| C. | Metalloids |
| D. | No option is correct. |
| Answer» D. No option is correct. | |
| 1728. |
______ is the metal used for making filaments of electric bulbs. |
| A. | Iron |
| B. | Tungsten |
| C. | Silver |
| D. | Nickel |
| Answer» C. Silver | |
| 1729. |
________ is the best conductor of heat |
| A. | Lead |
| B. | Mercury |
| C. | Silver |
| D. | Stainless steel |
| Answer» D. Stainless steel | |
| 1730. |
Micelles in the aqueous solution above critical micelle concentration are formed by _____. |
| A. | (NH2)2 CO |
| B. | C17H35COONa |
| C. | HOCH2 – CH2OH |
| D. | C12H22O11 |
| Answer» C. HOCH2 – CH2OH | |
| 1731. |
Food cans are coated with tin and NOT zinc because ________. |
| A. | Zinc is less reactive than tin |
| B. | Zinc has higher melting point than tin |
| C. | Zinc is costlier than tin |
| D. | Zinc is more reactive than tin |
| Answer» E. | |
| 1732. |
If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength λ, then for 1.5 p momentum of the photoelectron, the wavelength of the light should be:(Assume kinetic energy of ejected photoelectron to be very high in comparison to work function): |
| A. | \(\frac{3}{4}\lambda \) |
| B. | \(\frac{1}{2}\lambda \) |
| C. | \(\frac{2}{3}\lambda \) |
| D. | \(\frac{4}{9}\lambda \) |
| Answer» E. | |
| 1733. |
Ionic compounds _________.I. have high boiling pointII. have high melting pointIII. conduct electricity in solution |
| A. | Only I and II |
| B. | Only I and III |
| C. | Only II and III |
| D. | All I, II and III |
| Answer» E. | |
| 1734. |
If the egg shell is treated with solution A and the gas that is evolved turns limewater milky. The solution A is: |
| A. | HCl |
| B. | H2S |
| C. | KCl |
| D. | HNO3 |
| Answer» B. H2S | |
| 1735. |
If h is the Hydrogen ion concentration in gm/l, the pH value is given as: |
| A. | log h |
| B. | −log h |
| C. | log (1 + h) |
| D. | \(\log \frac{1}{\left( 1+h \right)}\) |
| Answer» C. log (1 + h) | |
| 1736. |
Modern periodic table has: |
| A. | 18 groups and 7 periods |
| B. | 8 periods 7 groups |
| C. | 7 periods 8 groups |
| D. | 7 groups and 18 periods |
| Answer» B. 8 periods 7 groups | |
| 1737. |
Mark incorrect statement |
| A. | CNG can be transported easily through pipelines |
| B. | CNG burns easily |
| C. | CNG is cleaner fuel |
| D. | CNG gives very less heat energy. |
| Answer» E. | |
| 1738. |
People prefer to wear cotton clothes in the summer season. This is due to the fact that cotton clothes are |
| A. | good absorbers of water |
| B. | good conveyors of heat |
| C. | good radiators of heat |
| D. | good absorbers of heat |
| Answer» B. good conveyors of heat | |
| 1739. |
Choose the INCORRECT statement about the characteristics of a chemical change. |
| A. | Properties of the products are different from that of reactants. |
| B. | New substances are formed. |
| C. | Produces heat during the reaction. |
| D. | Results in the energy change in most of the reactions |
| Answer» D. Results in the energy change in most of the reactions | |
| 1740. |
Consider the following statements:1. Radon is the heaviest gas.2. Astatine is a rarer element on Earth.3. Graphite is an allotrope of carbon.Which among the above statement(s) is/are correct? |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | Only 3 |
| D. | All of the above |
| Answer» E. | |
| 1741. |
20 mL of 0.1 MH2SO4 solution is added to 30 mL of 0.2 M NH4OH solution. The pH of the resultant mixture is: [pKb of NH4OH = 4.7]. |
| A. | 9.4 |
| B. | 5.0 |
| C. | 9.0 |
| D. | 5.2 |
| Answer» B. 5.0 | |
| 1742. |
For \(Z = \frac {PV}{nRT},\) Z is known as: |
| A. | Probability factor |
| B. | Collision factor |
| C. | Compressibility factor |
| D. | Boyle point |
| Answer» D. Boyle point | |
| 1743. |
Beryllium is very similar to ________. |
| A. | Aluminium |
| B. | Zinc |
| C. | Radon |
| D. | Lithium |
| Answer» B. Zinc | |
| 1744. |
Given:Co3+ + e- → CO2+; E° = +1.81 VPb4+ + 2e- → Pb2+; E° = +1.67 VCe4+ + e- → Ce3+; E° = +1.61 VBi3+ + 3e- → Bi; E° = +0.20 VOxidizing power of the species will increase in the order: |
| A. | Ce4+ < Pb4+ < Bi3+ < Co3+ |
| B. | Bi3+ < Ce4+ < Pb4+ < Co3+ |
| C. | Co3+ < Ce4+ < Bi3+< Pb4+ |
| D. | Co3+< Pb4+ < Ce4+ < Bi3+ |
| Answer» C. Co3+ < Ce4+ < Bi3+< Pb4+ | |
| 1745. |
________ is the most metallic element in the fifth period |
| A. | Rubidium |
| B. | Calcium |
| C. | Gold |
| D. | Platinum |
| Answer» B. Calcium | |
| 1746. |
______ metal is neither malleable nor ductile. |
| A. | Platinum |
| B. | Aluminum |
| C. | Zinc |
| D. | copper |
| Answer» D. copper | |
| 1747. |
A chemical reaction is called ______ reaction when heat is given out. |
| A. | exothermic |
| B. | combination |
| C. | endothermic |
| D. | decomposition |
| Answer» B. combination | |
| 1748. |
In which year Dalton's atomic theory was proposed by John Dalton? |
| A. | 1806 |
| B. | 1808 |
| C. | 1812 |
| D. | 1816 |
| Answer» C. 1812 | |
| 1749. |
Brass gets discolored in air due to the presence of |
| A. | oxygen |
| B. | hydrogen sulphide |
| C. | carbon dioxide |
| D. | nitrogen |
| Answer» C. carbon dioxide | |
| 1750. |
Blue litmus paper turns __________ on contact with an acidic solution. |
| A. | yellow |
| B. | brown |
| C. | green |
| D. | red |
| Answer» E. | |