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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.
| 751. |
Heat treatment of muscular pain involves radiation of wavelength of about 900nm. Which spectral line of H -atom is suitable for this purpose? [RH = 1 × 105 cm-1, h = 6.6 × 10-34 Js, c = 3 × 108 ms-1] |
| A. | Paschen, 5 → 3 |
| B. | Paschen, ∞ → 3 |
| C. | Lyman, ∞ → 1 |
| D. | Balmer, ∞ → 2 |
| Answer» C. Lyman, ∞ → 1 | |
| 752. |
Aluminium metal is extracted only by: |
| A. | Electrolysis |
| B. | Calcination |
| C. | Reduction |
| D. | Oxidation |
| Answer» B. Calcination | |
| 753. |
Impossible orbitals among the following is |
| A. | 2s |
| B. | 2p |
| C. | 3f |
| D. | 4d |
| Answer» D. 4d | |
| 754. |
Oxides of carbon, nitrogen, and sulfur released while burning fossil fuels are ______ oxides. |
| A. | Amphoteric |
| B. | Acidic |
| C. | Alkaline |
| D. | Neutral |
| Answer» C. Alkaline | |
| 755. |
_____ is not a subatomic particle of an atom. |
| A. | Neutron |
| B. | Electron |
| C. | Xenon |
| D. | Proton |
| Answer» D. Proton | |
| 756. |
C2H5Br reacts with CH3Br in presence of Na and dry ether gives: |
| A. | C3H8 |
| B. | C4H10 |
| C. | C2H6 |
| D. | C2H6, C3H8, C4H10 |
| Answer» E. | |
| 757. |
'Plaster of Paris' is made up of |
| A. | Marble |
| B. | Cement |
| C. | Gypsum |
| D. | Limestone |
| Answer» D. Limestone | |
| 758. |
Aromatic hydrocarbons contain at least ________ benzene like ring in their molecules. |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» B. Two | |
| 759. |
Heera is a strict form ofA. OxygenB. NitrogenC. MercuryD. Carbon |
| A. | C |
| B. | A |
| C. | B |
| D. | D |
| Answer» E. | |
| 760. |
In the water cycle, snow and ice get directly converted into vapours. This process is called: |
| A. | Evaporation |
| B. | Sublimation |
| C. | Boiling |
| D. | Transpiration |
| Answer» C. Boiling | |
| 761. |
In 2018 - Aug, an American Court fined $289 million to Monsanto for its product _______. because it causes cancer among humans. |
| A. | A herbicide (weed-killer) made from Glyphosate |
| B. | Bt-brinjal |
| C. | Bt-mustard |
| D. | Bt-cotton |
| Answer» B. Bt-brinjal | |
| 762. |
Ajay wanted to prepare lemon juice for his friend. His first dissolved 50 g of sugar in 150 g of water before adding the lemon extract. What is the concentration of sugar in the solution in terms of its mass percentage? |
| A. | 40% |
| B. | 50% |
| C. | 25% |
| D. | 33.3% |
| Answer» D. 33.3% | |
| 763. |
Buckminsterfullerence is an example of _______ of carbon. |
| A. | an isomer |
| B. | an isotope |
| C. | an allotrope |
| D. | a functional group |
| Answer» D. a functional group | |
| 764. |
A solution that obeys the Raoult's law is |
| A. | salt solution |
| B. | saturated solution |
| C. | colloidal solution |
| D. | ideal solution |
| Answer» E. | |
| 765. |
A drop of food colouring spreading out in a cup of water is an example of: |
| A. | Effusion |
| B. | Diffusion |
| C. | Vapour pressure |
| D. | Osmosis |
| Answer» C. Vapour pressure | |
| 766. |
Francium is highly radioactive; its longest-lived [isotope] 223Fr87 has a half-life of only _________. |
| A. | 2.1 seconds |
| B. | 21 seconds |
| C. | 2.1 minutes |
| D. | 21 minutes |
| Answer» E. | |
| 767. |
Identify the x, y, z in the following reaction after balancing.xMnO-4 + yFe3O4 + H2 O → xMnO2 + ZFe2 O3 + xOH |
| A. | 3, 4, 6 |
| B. | 2, 6, 9 |
| C. | 3, 6, 4 |
| D. | 2, 9, 6 |
| Answer» C. 3, 6, 4 | |
| 768. |
Name the process in which a metal is attacked by substances around it such as moisture and acids etc. |
| A. | Oxidation |
| B. | Corrosion |
| C. | Rancidity |
| D. | Reduction |
| Answer» C. Rancidity | |
| 769. |
Choose the correct order of electrical resistivity of metals. |
| A. | Ag> W> Ni> Hg |
| B. | Hg> Ni> W> Ag |
| C. | Ag> Ni> Hg> W |
| D. | Ag> W> Hg> Ni |
| Answer» C. Ag> Ni> Hg> W | |
| 770. |
In Mendeleev’s periodic table, the properties of the elements are considered a periodic function of their: |
| A. | Atomic number |
| B. | Atomic mass |
| C. | Ionization enthalpy |
| D. | Atomic size |
| Answer» C. Ionization enthalpy | |
| 771. |
Electronegativity is the measure of the capacity of an atom to- |
| A. | Repel protons |
| B. | Repel electrons |
| C. | Attract electrons |
| D. | Attract protons |
| Answer» D. Attract protons | |
| 772. |
Boric acid is an acid because its molecule: |
| A. | accepts OH- from water releasing proton |
| B. | combines with proton from water molecule |
| C. | contains replaceable H+ ion |
| D. | gives up a proton |
| Answer» B. combines with proton from water molecule | |
| 773. |
Blood plasma has a pH of |
| A. | 7.4 |
| B. | 7.8 |
| C. | 6.9 |
| D. | 6.3 |
| Answer» B. 7.8 | |
| 774. |
How many oxygen atoms are there in one molecule of ethyl alcohol? |
| A. | 1 |
| B. | 6 |
| C. | 2 |
| D. | 3 |
| Answer» B. 6 | |
| 775. |
Calculate the relative molecular mass of water (H2O). |
| A. | 18 u |
| B. | 1.8 u |
| C. | 2.0 u |
| D. | 20 u |
| Answer» B. 1.8 u | |
| 776. |
Process of losing electrons is known as _______. |
| A. | oxidation |
| B. | reduction |
| C. | radiation |
| D. | both oxidation and reduction |
| Answer» B. reduction | |
| 777. |
In hospitals, the oxygen tubes for respiration contain oxygen and? |
| A. | Argon |
| B. | Carbon dioxide |
| C. | Helium |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
| 778. |
Iodoform reaction is a confirmatory test for compound having |
| A. | -COH3 |
| B. | -CH3 |
| C. | -CONH2 |
| D. | -COOH |
| Answer» B. -CH3 | |
| 779. |
Noble gases belong to which of the following groups of the periodic table? |
| A. | 15 |
| B. | 18 |
| C. | 13 |
| D. | 16 |
| Answer» C. 13 | |
| 780. |
Gold is the most ______ metal. |
| A. | combustible |
| B. | reactive |
| C. | hard |
| D. | ductile |
| Answer» E. | |
| 781. |
Joule-Thomson process is extremely useful and economical for attaining low temperature. The process can be categorized as |
| A. | Isobaric process |
| B. | Isenthalpic process |
| C. | Adiabatic process |
| D. | Isochoric process |
| Answer» C. Adiabatic process | |
| 782. |
If the uncertainty in the Position of electron is zero, the uncertainty in its momentum would be- |
| A. | Zero |
| B. | Greater than \(\frac{h}{4\pi}\) |
| C. | Less than \(\frac{h}{4\pi}\) |
| D. | Infinite |
| Answer» E. | |
| 783. |
Consider the given plot of enthalpy of the following reaction between A and B.A + B → C + DIdentify the incorrect statement. |
| A. | Activation enthalpy to form C is 5KJ mol-1 less than that to form D |
| B. | C is the thermodynamically stable product. |
| C. | D is kinetically stable product |
| D. | Formation of A and B from C has highest enthalpy of activation. |
| Answer» B. C is the thermodynamically stable product. | |
| 784. |
Ammonia is a compound with the molecular formula of: |
| A. | N2O |
| B. | NaHCO3 |
| C. | NaOH |
| D. | NH3 |
| Answer» E. | |
| 785. |
Henry’s law is not applicable if: |
| A. | Pressure of the gas is high |
| B. | Gas does not react with solvent |
| C. | The gas does not undergo dissociation or association |
| D. | Temperature is high |
| Answer» B. Gas does not react with solvent | |
| 786. |
According to molecular orbital theory, which of the following is true with respect to \(Li_2^ +\) and \(Li_2^ -\)? |
| A. | Both are unstable |
| B. | \(Li_2^ + {\rm{\;is\;unstable\;and\;}}Li_2^ - \) is stable |
| C. | \(Li_2^ + {\rm{\;is\;stable\;and\;}}Li_2^ -\) is unstable |
| D. | Both are stable |
| Answer» E. | |
| 787. |
Metals react with acids to give: |
| A. | Salt and chlorine |
| B. | A salt and base |
| C. | A salt and hydrogen |
| D. | Salt and water |
| Answer» D. Salt and water | |
| 788. |
In which of the following options is the chemical compound and its common name INCORRECTLY matched? |
| A. | Sodium Bicarbonate - Baking Soda |
| B. | Nitrous Oxide - Laughing gas |
| C. | Calcium Carbonate - Limestone |
| D. | Sodium Hydroxide - Washing Soda |
| Answer» E. | |
| 789. |
Oxides of metals are basic in nature, that is, they combine with acids to form salt and water. Select the odd metal oxide from the following ones. |
| A. | MgO |
| B. | Na2O |
| C. | CaO |
| D. | Al2O3 |
| Answer» E. | |
| 790. |
________ is least reactive element belonging to group 17. |
| A. | Bromine |
| B. | Iodine |
| C. | chlorine |
| D. | Fluorine |
| Answer» C. chlorine | |
| 791. |
Isotopes are atoms of the same element with different number of |
| A. | Protons |
| B. | Electrons |
| C. | Neutrons |
| D. | Positrons |
| Answer» D. Positrons | |
| 792. |
Basing on science content which one is different from the other three? |
| A. | Isotope |
| B. | Allotrope |
| C. | Isobar |
| D. | Isomar |
| Answer» E. | |
| 793. |
Enthaply of sublimation of iodine is 24 cal g-1 at 200°C. If specific heat of I2(s) and I2(vap) are 0.055 and 0.031 cal g-1K-1 respectively, then enthalpy of sublimation of iodine at 250°C in cal g-1 is: |
| A. | 2.85 |
| B. | 5.7 |
| C. | 22.8 |
| D. | 11.4 |
| Answer» D. 11.4 | |
| 794. |
In liquids London forces are found in |
| A. | Polar molecules |
| B. | Non-polar molecules |
| C. | Hydrogen bonded molecules |
| D. | None of the above |
| Answer» C. Hydrogen bonded molecules | |
| 795. |
A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Identify M. |
| A. | Na |
| B. | Mg |
| C. | Cu |
| D. | Ca |
| Answer» D. Ca | |
| 796. |
Hydrochloric acid is made up of the elements hydrogen and? |
| A. | Carbon |
| B. | Chlorine |
| C. | Iron |
| D. | Sulphur |
| Answer» C. Iron | |
| 797. |
Cannot be prepared by |
| A. | CH3 CH2 COCH3 + PhMgX |
| B. | PhCOCH3 + CH3 CH2 MgX |
| C. | PhCOCH2 CH3 + CH3 MgX |
| D. | HCHO + PhCH(CH3)CH2 MgX |
| Answer» E. | |
| 798. |
All of the following alloying elements of steel increase hardness but sacrifice ductility, except |
| A. | Nickel |
| B. | Vanadium |
| C. | Molybdenum |
| D. | Chromium |
| Answer» B. Vanadium | |
| 799. |
Name the densest stable element known on earth. |
| A. | Osmium |
| B. | Tungsten |
| C. | Aluminium |
| D. | Rhodium |
| Answer» B. Tungsten | |
| 800. |
Methane an air pollutant is produced ________. |
| A. | by the action of ultraviolet light on nitrogenous compounds |
| B. | as a by-product of manufacturing ammoniacal fertilizers |
| C. | by burning of coal in insufficient air |
| D. | by digestion of food by animals |
| Answer» E. | |