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.
| 1501. |
Heavy water is made by ________ |
| A. | Dissolving salts of heavy metals in distilled water |
| B. | Repeated distillation and condensation of water |
| C. | Burning deuterium in oxygen |
| D. | By burning the heavier isotope of oxygen in hydrogen |
| Answer» D. By burning the heavier isotope of oxygen in hydrogen | |
| 1502. |
Mass number is always equal to ________. |
| A. | number of protons |
| B. | number of neutrons |
| C. | sum of number of protons and number of electrons |
| D. | sum of number of protons and number of neutrons |
| Answer» E. | |
| 1503. |
Petrochemicals are used in the manufacture of________. |
| A. | Detergent |
| B. | Biogas |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» B. Biogas | |
| 1504. |
Excessive consumption of alcoholic drinks causes damage to the |
| A. | Lungs |
| B. | Kidney |
| C. | Liver |
| D. | Heart |
| Answer» D. Heart | |
| 1505. |
Calculate the formula unit mass of Na2CO3.10 H2O. [Given atomic mass: Na = 23.0 u, C = 12.0 u, O = 16.0 u, and H = 1.0 u] |
| A. | 124 u |
| B. | 286 u |
| C. | 426 u |
| D. | 254 u |
| Answer» C. 426 u | |
| 1506. |
How are 'anions' formed? |
| A. | Addition of electron |
| B. | Removal of electron |
| C. | Addition of proton |
| D. | Removal of proton |
| Answer» B. Removal of electron | |
| 1507. |
______ is the most electropositive element among the given alternatives. |
| A. | S |
| B. | Cl |
| C. | Mg |
| D. | Al |
| Answer» D. Al | |
| 1508. |
Avogadro number is represented by ______. |
| A. | Av |
| B. | AN |
| C. | N0 |
| D. | |
| Answer» E. | |
| 1509. |
Boric acid is a/an? |
| A. | Germicide |
| B. | Antibiotic |
| C. | Strong antiseptic |
| D. | Mild antiseptic |
| Answer» E. | |
| 1510. |
Element X forms an oxide with the formula X2O3. The element X would most likely be in the same group of the periodic table as ________. |
| A. | magnetiium |
| B. | silicon |
| C. | aluminium |
| D. | sodium |
| Answer» D. sodium | |
| 1511. |
In a period, elements are arranged in the order of- |
| A. | Equal charges in the nucleus |
| B. | Constant charges in the nucleus |
| C. | Decreasing charges in the nucleus |
| D. | Increasing charges in the nucleus |
| Answer» E. | |
| 1512. |
In computers, chip is made up of: |
| A. | A thin layer of cobalt. |
| B. | A thin layer of silicon. |
| C. | A thin layer of silver |
| D. | A thin layer of copper |
| Answer» C. A thin layer of silver | |
| 1513. |
A solution turns blue litmus to red, its pH is likely to be _____. |
| A. | 9 |
| B. | 8 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 1514. |
Human respiration releasesA. Mixture of gasesB. Carbon monoxideC. OxygenD. Carbon dioxide |
| A. | C |
| B. | D |
| C. | B |
| D. | A |
| Answer» C. B | |
| 1515. |
In the reaction between hydrogen sulphate ion and water\({\rm{HSO}}_4^ - {\rm{\;}} + {\rm{\;}}{{\rm{H}}_2}0 \to {\rm{\;}} - {\rm{\gg \;}}{{\rm{H}}_3}{0^ + } + {\rm{SO}}_4^{2 - }\)the water acts as: |
| A. | an acid |
| B. | a base |
| C. | a salt |
| D. | an inert medium |
| Answer» C. a salt | |
| 1516. |
Ionic compounds dissolve in |
| A. | Polar solvents |
| B. | Non-polar solvents |
| C. | Organic solvents |
| D. | Non-aqueous |
| Answer» B. Non-polar solvents | |
| 1517. |
Each letter of which letter-trio is a symbol of an element? |
| A. | V, X, Z |
| B. | W, X, Y |
| C. | V, W, Y |
| D. | V, Y, Z |
| Answer» D. V, Y, Z | |
| 1518. |
71g of CI2 contains atoms: |
| A. | 1.205 × 1021 |
| B. | 1.205 × 1024 |
| C. | 1.205 × 1023 |
| D. | 1.205 × 1022 |
| Answer» C. 1.205 × 1023 | |
| 1519. |
Protium, deuterium, and tritium are ______ of hydrogen. |
| A. | Isobar |
| B. | Ideotype |
| C. | Isotopes |
| D. | Isotrope |
| Answer» D. Isotrope | |
| 1520. |
NO2 required for a reaction is produced by the decomposition of N2O5 in CCl4 as per the equation,2N2O5 (g) → 4NO2 (g) + O2The initial concentration of N2O5 is 3.00 mol L-1 and it is 2.75 mol L-1 after 30 minutes. The rate of formation of NO2 is: |
| A. | 4.167 × 10-3 mol L-1 min-1 |
| B. | 1.667 × 10-2 mol L-1 min-1 |
| C. | 8.333 × 10-3 mol L-1 min-1 |
| D. | 2.083 × 10-3 mol L-1 min-1 |
| Answer» C. 8.333 × 10-3 mol L-1 min-1 | |
| 1521. |
Dry powder extinguishers contain ____________. |
| A. | Sand + washing soda |
| B. | Sand + Na2CO3 |
| C. | Sand + baking soda |
| D. | Sand + K2CO3 |
| Answer» D. Sand + K2CO3 | |
| 1522. |
How many moles are present in 36 gm of water? |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» C. 4 | |
| 1523. |
In terms of ionisation enthalpy, H resembles which of the group’s elements more? |
| A. | 17th group |
| B. | 1st group |
| C. | Both 1st and 17th group |
| D. | Neither 1st group nor 17th group |
| Answer» B. 1st group | |
| 1524. |
Homoleptic octahedral complexes of a metal ion 'M3+' with three monodentate ligands L1, L2 and L3 absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is |
| A. | L1 < L2 < L3 |
| B. | L2 < L1 < L3 |
| C. | L3 < L1 < L2 |
| D. | L3 < L2 < L1 |
| Answer» D. L3 < L2 < L1 | |
| 1525. |
How many molecules of water are present in one molecule of copper sulphate? |
| A. | 4 |
| B. | 3 |
| C. | 6 |
| D. | 5 |
| Answer» E. | |
| 1526. |
In a Silicon oxidation model, if hG is the gas phase mass transfer co-efficient, CG is the oxidant concentration in the bulk of the gas and CS is the oxidant concentration adjacent to the oxide surface, then for steady-state, the gas phase flux can be expressed as:a) \(\frac{\left( {{C}_{S}}-{{C}_{G}} \right)}{{{h}_{G}}}\)b) \(\frac{\left( {{C}_{G}}-{{C}_{S}} \right)}{{{h}_{G}}}\)c) hG (CG - CS)d) hG (CS - CG)of these statements. |
| A. | (a) and (c) are correct |
| B. | (b) is correct but (d) is wrong |
| C. | (c) is correct but (a) is wrong |
| D. | (a), (b) and (c) are correct but (d) is wrong |
| Answer» D. (a), (b) and (c) are correct but (d) is wrong | |
| 1527. |
Constantan is alloyed from ____ metals. |
| A. | Ni, Ti, Fe, Cr |
| B. | Cu, Ni, Mn |
| C. | Ni, Cr, Mn, Fe |
| D. | Cu, Ni |
| Answer» E. | |
| 1528. |
Natural rubber is polymer of(a) Ethene(b) Isoprene(c) Acetylene |
| A. | (b) only |
| B. | (c) only |
| C. | (a), (b), (c) |
| D. | (a) only |
| Answer» B. (c) only | |
| 1529. |
Bhopal Gas Tragedy of 1984 took place because methyl isocyanide reacted with |
| A. | nitrogen |
| B. | water |
| C. | carbon dioxide |
| D. | All of the above |
| Answer» C. carbon dioxide | |
| 1530. |
100 mL of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO3 is: (Molar mass of calcium bicarbonate is 162 g.mol-1 and magnesium bicarbonate is 146 g.mol-1) |
| A. | 5,000 ppm |
| B. | 1,000 ppm |
| C. | 100 ppm |
| D. | 10,000 ppm |
| Answer» E. | |
| 1531. |
Artificial rain is produced by seeding clouds with |
| A. | Silver Iodide |
| B. | Potassium Nitrate |
| C. | Copper Sulphate |
| D. | Silver Nitrate |
| Answer» B. Potassium Nitrate | |
| 1532. |
Atomic number of which of the following elements is greater than that of Aluminium? |
| A. | Phosphorus |
| B. | Neon |
| C. | Magnesium |
| D. | Sodium |
| Answer» B. Neon | |
| 1533. |
______ are homogeneous mixtures of two or more components. |
| A. | Emulsions |
| B. | Enzymes |
| C. | Solutions |
| D. | Amalgams |
| Answer» D. Amalgams | |
| 1534. |
Each water molecule, contains _______ hydrogen atoms and one Oxygen atom. |
| A. | Two |
| B. | Three |
| C. | One |
| D. | Four |
| Answer» B. Three | |
| 1535. |
Galvanized iron sheets are coated with __________. |
| A. | Tin |
| B. | Lead |
| C. | Zinc |
| D. | Copper |
| Answer» D. Copper | |
| 1536. |
Isotopes have _______.I. Similar physical quantities and different chemical propertiesII. Different physical propertiesIII. Similar chemical properties |
| A. | Only I and II |
| B. | Only I and III |
| C. | Only II and III |
| D. | All I, II and III |
| Answer» D. All I, II and III | |
| 1537. |
Copper consists of two isotopes A and B, whose atomic masses are 62.93 amu and 64.93 amu respectively. The atomic mass of copper is 63.55 amu. Calculate the percentage of the isotopes A and B. |
| A. | A (51%) & B (49 %) |
| B. | A (60%) & B (40 %) |
| C. | A (69%) & B (31%) |
| D. | A (1%) & B (99 %) |
| Answer» D. A (1%) & B (99 %) | |
| 1538. |
For the cell, Zn (s) |Zn2+) (aq)||Mx+)(aq)|M(s), different half cells and their standard electrode potentials are given below.Mx+(aq)/M(s)Au3+(aq)/Au(s)Ag+(aq) /Ag(s)Fe3+(aq)/Fe2+ (s)Fe2+(aq) /Fe(s)\({E^o}_{{M^{{\rm{x}} + }}/M}/V\)1.400.800.77-0.44If \(E{^\circ _{Z{n^{2 + }}/Zn\;}} - 0.76V\), which cathode will give a maximum value of \(E{^\circ _{cell}}\;\) per electron transferred? |
| A. | \(\frac{{A{g^ + }}}{{Ag}}\) |
| B. | \(\frac{{F{e^ + }}}{{Fe}}\) |
| C. | \(\frac{{A{u^{3 + }}}}{{Au}}\) |
| D. | \(\frac{{F{e^{3 + }}}}{{F{e^{2 + }}}}\) |
| Answer» D. \(\frac{{F{e^{3 + }}}}{{F{e^{2 + }}}}\) | |
| 1539. |
Isobars are atoms of different chemical elements that have ________. |
| A. | Same atomic number but different mass number |
| B. | Same mass number but different atomic number |
| C. | Same mass number and same atomic number |
| D. | Different mass number and different atomic number |
| Answer» C. Same mass number and same atomic number | |
| 1540. |
Consider the following statements:1. The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction.2. In a nuclear reactor, the reaction is controlled, while in nuclear bombs, the reaction is uncontrolled.3. In a nuclear reactor, all operating reactors are ‘critical’, while there is no question of ‘criticality’ in case of a nuclear bomb.4. Nuclear reactors do not use moderators, while nuclear bombs use them.Which of the above statements about operational principles of a nuclear reactor and a nuclear bomb is / are correct? |
| A. | 1 and 3 |
| B. | 2 and 3 |
| C. | 4 only |
| D. | 1 and 4 |
| Answer» C. 4 only | |
| 1541. |
If a solution turns blue litmus red, its pH is likely to be: |
| A. | 9 |
| B. | 8 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 1542. |
Burning Magnesium ribbon produce white ash, which dissolves in water to form _____. |
| A. | Magnesium Hydroxide |
| B. | Magnesium Oxide |
| C. | Magnesium Halides |
| D. | Magnesium Sulphate |
| Answer» B. Magnesium Oxide | |
| 1543. |
Isotopes have ___________.I. similar physical quantities and different chemical propertiesII. different physical propertiesIII. similar chemical properties |
| A. | Only I and II |
| B. | Only I and III |
| C. | Only II and III |
| D. | All I, II and III |
| Answer» D. All I, II and III | |
| 1544. |
Notice the equation PbO + HCl → PbCl2 + H2O.The balance of the above equation requires _______ moles of HCl. |
| A. | 1 |
| B. | 4 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 1545. |
According to World Health Organization, the soft water has 0 to _____ milligram per litre as CaCO3. |
| A. | 30 |
| B. | 60 |
| C. | 90 |
| D. | 120 |
| Answer» C. 90 | |
| 1546. |
______ is an active ingredient in all the alcoholic drinks. |
| A. | Pentane |
| B. | Ethanol |
| C. | Butane |
| D. | Propane |
| Answer» C. Butane | |
| 1547. |
Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to: |
| A. | Lanthanoid contraction |
| B. | Lattice effect |
| C. | Diagonal relationship |
| D. | Inert pair effect |
| Answer» E. | |
| 1548. |
A strong acid has conjugate |
| A. | Strong base |
| B. | Weak base |
| C. | Strong acid |
| D. | Weak acid |
| Answer» C. Strong acid | |
| 1549. |
________ on mixing with water changes to gypsum. |
| A. | Calcium Phosphte |
| B. | Sodium Hydrogen Carbonate |
| C. | Calcium Phosphate Hemihydrate |
| D. | Calcium Sulphate Hemihydrate |
| Answer» E. | |
| 1550. |
How many atoms are present in one mole of copper? |
| A. | 6.022 × 1024 |
| B. | 6.022 × 1025 |
| C. | 6.022 × 1022 |
| D. | 6.022 × 1023 |
| Answer» E. | |