MCQOPTIONS
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MCQOPTIONS
This section includes 200950 Mcqs, each offering curated multiple-choice questions to sharpen your General Knowledge knowledge and support exam preparation. Choose a topic below to get started.
| 2501. |
War has been, throughout history, the chief _________ of social cohesion; and since science began, it has been the strongest ________ to technical progress. |
| A. | Reason, encouragement |
| B. | origin, boost |
| C. | cause, provocation |
| D. | source, incentive |
| Answer» E. | |
| 2502. |
An electron is moving in Bohr's fourth orbit. Its de Broglie wavelength is λ . What is the circumference of the fourth orbit? |
| A. | 2/λ |
| B. | 2λ |
| C. | 4λ |
| D. | -4/λ |
| Answer» D. -4/λ | |
| 2503. |
Part of the confusion in our societies _______ from our pursuit of efficiency and economic growth, in the __________ that these are the necessary ingredients of progress. |
| A. | sterns, conviction |
| B. | derives, evaluation |
| C. | emerges, consideration |
| D. | extends, planning |
| Answer» D. extends, planning | |
| 2504. |
Seeing the pictures of our old home made me feel ________ and nostalgic. |
| A. | Fastidious |
| B. | Indignant |
| C. | Wistful |
| D. | conciliatory |
| Answer» D. conciliatory | |
| 2505. |
The frequency of light emitted for the transition n=4 to n=2 of He is equal to the transition in H atom corresponding to which of the following? |
| A. | n=2 to n=1 |
| B. | n=3 to n=2 |
| C. | n=4 to n=3 |
| D. | n=3 to n=1 |
| Answer» C. n=4 to n=3 | |
| 2506. |
Book publishing has long been _______ profession, partly because, for younger editors, the best way to win a raise or a promotion was to move on to another publishing house. |
| A. | an innovative |
| B. | a prestigious |
| C. | an itinerant |
| D. | a rewarding |
| Answer» D. a rewarding | |
| 2507. |
The Hα spectral line in Lyman series of hydrogen atomic spectrum is formed due to an electronic transition in hydrogen atom. The energies associated with the electron in each of the orbits involved in the transition (in kCal mol-1) are |
| A. | -313.6, –34.84 |
| B. | -313.6, -78.4 |
| C. | -78.4, -34.84 |
| D. | -78.4, -19.6 |
| Answer» C. -78.4, -34.84 | |
| 2508. |
According to Bohr’s theory, which one of the following values of angular momentum of hydrogen atom is not permitted ? |
| A. | 0.5h/π |
| B. | 1.25h/π |
| C. | h/π |
| D. | 1.5h/π |
| Answer» C. h/π | |
| 2509. |
The radial probability distribution curve obtained for an orbital wave function (Ψ) has 3 peaks and 2 radial nodes. The valence electron of which one of the following metals does this wave function (Ψ) correspond to ? |
| A. | Cu |
| B. | Li |
| C. | K |
| D. | Na |
| Answer» E. | |
| 2510. |
The correct order of radii is? |
| A. | N u003c Be u003c B |
| B. | F- u003c O2- u003c N3- |
| C. | Na u003c Li u003c K |
| D. | Fe3+ u003c Fe2+ u003c Fe4 |
| Answer» B. F- u003c O2- u003c N3- | |
| 2511. |
The radius of Bohr’s first orbit in Li2 is? |
| A. | 0.0587 pm |
| B. | 17.63 pm |
| C. | 176.3 pm |
| D. | 0.529 pm |
| Answer» B. 17.63 pm | |
| 2512. |
The ratio of radii of first three orbits in hydrogen atom is? |
| A. | 1 : 4 : 9 |
| B. | 1 : 2 : 3 |
| C. | 1 : 2 : 4 |
| D. | 9 : 4 : 1 |
| Answer» B. 1 : 2 : 3 | |
| 2513. |
The set representing correct order of first ionization potential is? |
| A. | K u003e Na u003e Li |
| B. | Be u003e Mg u003e Ca |
| C. | B u003e C u003e N |
| D. | Ge u003e Si u003e C |
| Answer» C. B u003e C u003e N | |
| 2514. |
The first ionization potentials of Na, Mg, Al and Si are in the order? |
| A. | Na u003c Mg u003e Al u003c Si |
| B. | Na u003c Mg u003c Al u003e Si |
| C. | Na u003e Mg u003e Al u003e Si |
| D. | Na u003e Mg u003e Al u003c Si |
| Answer» B. Na u003c Mg u003c Al u003e Si | |
| 2515. |
The electron configuration of elements A, B and C are [He]2s1,[Ne]3s1 and [Ar]4s1 respectively. Which one of the following order is correct for the first ionization potentials (in kJ mol–1) of A, B and C? |
| A. | A u003e B u003e C |
| B. | C u003e B u003e A |
| C. | B u003e C u003eA |
| D. | C u003e A u003e C |
| Answer» B. C u003e B u003e A | |
| 2516. |
The incorrect statement among the following is? |
| A. | The first ionization potential of Al is less than the first ionization potential of Mg. |
| B. | The second ionization potential of Mg is greater than the second ionization potential Na. |
| C. | The first ionization potential of Na is less than the first ionization potential of Mg. |
| D. | The third ionization potential of Mg is greater than that of Al. |
| Answer» C. The first ionization potential of Na is less than the first ionization potential of Mg. | |
| 2517. |
The correct order of second ionization energies of C, N, O and F is? |
| A. | C u003e N u003e O u003e F |
| B. | O u003e N u003e F u003e C |
| C. | O u003e F u003e N u003e C |
| D. | F u003e O u003e N u003e C |
| Answer» D. F u003e O u003e N u003e C | |
| 2518. |
Which of the following order is correct for the first ionization energies of their elements? |
| A. | B u003c Be u003c N u003c O |
| B. | Be u003c B u003c N u003c O |
| C. | B u003c Be u003c O u003c N |
| D. | B u003c O u003c Be u003c N |
| Answer» D. B u003c O u003c Be u003c N | |
| 2519. |
The first ionization potential of four consecutive elements, present in the second period of the periodic table are 8.3, 11.3, 14.5 and 13.6 eV respectively. Which one of the following is the first ionization potential (inneV) of nitrogen? |
| A. | 13.6 |
| B. | 11.3 |
| C. | 8.3 |
| D. | 14.5 |
| Answer» E. | |
| 2520. |
In an alkaline medium, glycine predominantly exists as a /an____. |
| A. | anion |
| B. | cation |
| C. | covalent form |
| D. | zwitterions |
| Answer» B. cation | |
| 2521. |
In chromite ore, the oxidation number iron and chromium are respectively ______. |
| A. | +3, +6 |
| B. | +3, +2 |
| C. | +2, +3 |
| D. | +2, +6 |
| Answer» D. +2, +6 | |
| 2522. |
H2S is passed into one dm3 of a solution containing 0.1 mole of Zn2 and 0.01 mole of Cu2 till the sulphide ion concentration reaches 8.1 ´10–19 moles. Which one of the following statements is true? [Ksp of ZnS and CuS are 3]´ a Both CuS and ZnS precipitate b Only ZnS precipitates c No precipitation occurs d Only CuS precipitates Both CuS and ZnS precipitate |
| A. | Both CuS and ZnS precipitate |
| B. | Only ZnS precipitates |
| C. | No precipitation occurs |
| D. | Only CuS precipitates |
| Answer» B. Only ZnS precipitates | |
| 2523. |
Identify B and D is the following sequence of reactions.? |
| A. | Ethyl hydrogen sulphate andalcoholic KOH |
| B. | Methanol and bromoethane |
| C. | Ethanol and alcoholic KOH |
| D. | Ethyl hydrogen sulphate and aqueous KOH |
| Answer» D. Ethyl hydrogen sulphate and aqueous KOH | |
| 2524. |
If the energies of the two photons are in the ratio of 3: 2, their wavelengths will be in the ratio of? |
| A. | 2: 3 |
| B. | 9: 4 |
| C. | 3: 2 |
| D. | 1: 2 |
| Answer» B. 9: 4 | |
| 2525. |
Generally, the first ionization energy increases along a period. But there are some exceptions. The one which is NOT an exception is ______. |
| A. | Be and B |
| B. | Na and Mg |
| C. | Mg and Al |
| D. | N and O |
| Answer» C. Mg and Al | |
| 2526. |
For the reversible reaction, A(s) B(g) ⇌ C(g) D(g) ΔG° = -350 kJ, which one of the following statements is true? |
| A. | The entropy change is negative |
| B. | The reaction is thermodynamically nonfeasible |
| C. | The reaction should be instantaneous |
| D. | Equilibrium constant is greater then one. |
| Answer» E. | |
| 2527. |
Formic acid is a stronger acid than acetic acid. This can be explained using? |
| A. | –I effect |
| B. | +M effect |
| C. | –M effect |
| D. | +I effect |
| Answer» E. | |
| 2528. |
Ethyl benzene can't be prepared by ______. |
| A. | Wurtz-Fittig reaction |
| B. | Wurtz reaction |
| C. | Clemmensen reduction |
| D. | Friedel-Crafts reaction |
| Answer» C. Clemmensen reduction | |
| 2529. |
During the adsorption of Krypton on activated charcoal at low temperature; ______. |
| A. | ΔH u003e 0 and ΔS u003c 0 |
| B. | ΔH u003c 0 and ΔS u003c 0 |
| C. | ΔH u003c 0 and ΔS u003e 0 |
| D. | ΔH u003e 0 and ΔS u003e 0 |
| Answer» C. ΔH u003c 0 and ΔS u003e 0 | |
| 2530. |
E1, E2 and E3 are the emfs of the following three galvanic cells respectively:(i) Zn (s) | Zn2 (0.1 M) || Cu2 (1M) | Cu (s)(ii) Zn (s) | Zn2 (1 M) || Cu2 a E1 u003e E2 u003e E3 b E2 u003e E1 u003e E3 c E3 u003e E2 u003e E1 d E3 u003e E1 u003e E2 E1 u003e E2 u003e E3 See Answer Next Question Skip Share this Question View on App Suggest Correction × Suggest correction Your name: Your Email: Correction suggested: Submit |
| A. | E1 u003e E2 u003e E3 |
| B. | E2 u003e E1 u003e E3 |
| C. | E3 u003e E2 u003e E1 |
| D. | E3 u003e E1 u003e E2 |
| Answer» B. E2 u003e E1 u003e E3 | |
| 2531. |
Carbon cannot reduce Fe2O3 to Fe at a temperature below 983 K because ______. |
| A. | CO is thermodynamically more stable then Fe2O3 |
| B. | free energy change for the formation of CO is more negative then that of Fe2O3 |
| C. | iron has higher affinity towards oxygen then carbon |
| D. | carbon has higher affinity towards oxygen then iron |
| Answer» D. carbon has higher affinity towards oxygen then iron | |
| 2532. |
50 cm3 of 0.2 N HCl is titrated against 0.1 N NaOH solution. The titration was discontinued after adding 50 cm3 of NaOH. The remaining titration is completed by adding 0.5 N KOH. The volume of KOH required for completing the titration is? |
| A. | 12 cm3 |
| B. | 10 cm3 |
| C. | 21.0 cm3 |
| D. | 16.2 cm3 |
| Answer» C. 21.0 cm3 | |
| 2533. |
A buffer solution contains 0.1 mole of sodium acetate dissolved in 1000 cm3 of 0.1 M acetic acid. To the above buffer solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is ______. |
| A. | pKa + 1 |
| B. | pKa |
| C. | pKa + Log 2 |
| D. | pKa = Log 2 |
| Answer» D. pKa = Log 2 | |
| 2534. |
A solution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows? |
| A. | Positive deviation from Raoult's law |
| B. | Negative deviation from Raoult's law |
| C. | Positive or negative deviation from Raoult's law depending upon the composition |
| D. | No deviation from Raoult's law |
| Answer» C. Positive or negative deviation from Raoult's law depending upon the composition | |
| 2535. |
A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the calcium ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is[Atomic mass of Ca =40] |
| A. | 75 |
| B. | 31.5 |
| C. | 40.2 |
| D. | 25 |
| Answer» B. 31.5 | |
| 2536. |
a-maltose consists of |
| A. | two -D-glucopyranose units with 1-2 glycosidic linkage |
| B. | one -D-glucopyranose units and one -D-glucopyranose unit with 1-2 glycosidic linkage |
| C. | two -D-glucopyranose units with 1-4 glycosidic linkage |
| D. | two -D-glucopyranose units with 1-4 glycosidic linkage |
| Answer» D. two -D-glucopyranose units with 1-4 glycosidic linkage | |
| 2537. |
1.2 g of organic compound on Kjeldahilization liberates ammonia which consumes 30 cm3 of 1 N HCl. The percentage of nitrogen in the organic compound is ______. |
| A. | 35 |
| B. | 30 |
| C. | 20.8 |
| D. | 40 |
| Answer» B. 30 | |
| 2538. |
When conc. H2SO4 is heated with P2 05 , the acid is converted into? |
| A. | sulphur |
| B. | sulphur dioxide |
| C. | sulphur trioxide |
| D. | a mixture of sulphur dioxide and sulphur trioxide |
| Answer» D. a mixture of sulphur dioxide and sulphur trioxide | |
| 2539. |
An amount of money is to be distributed among F, Q and R in the ratio 3 : 5 : 7. If Q's share is Rs. 1500, what is the difference between P's and R's shares? . |
| A. | Rs. 1200 |
| B. | Rs. 1600 |
| C. | Rs, 1500 |
| D. | Rs. 1900 |
| Answer» B. Rs. 1600 | |
| 2540. |
If 7 : x = 17.5 : 22.5 , then the value of x is:. |
| A. | 9 |
| B. | 6 |
| C. | 7.5 |
| D. | 5.5 |
| Answer» B. 6 | |
| 2541. |
Pencils, Pens and Exercise books in a shop are in the ratio of 10: 2 : 3. If there are 120 pencils, the number of exercise books in the shop is:. |
| A. | 36 |
| B. | 72 |
| C. | 48 |
| D. | 400 |
| Answer» B. 72 | |
| 2542. |
X, Y and Z share a sum of money in the ratio 7 : 8 : 16. If Z receives Rs. 27 more than X, then the total money shared was ? |
| A. | Rs. 48 |
| B. | Rs. 279 |
| C. | Rs. 93 |
| D. | Rs. 558 |
| Answer» D. Rs. 558 | |
| 2543. |
If a + b : b + c : c + a = 6 : 7 : 8 and a + b + c = 14, then the value of c is ? |
| A. | 6 |
| B. | 8 |
| C. | 7 |
| D. | 14 |
| Answer» B. 8 | |
| 2544. |
If 15% of x is the same as 20% of y, then x : y is ? |
| A. | 3 : 4 |
| B. | 17 : 16 |
| C. | 4 : 3 |
| D. | 16 : 17 |
| Answer» D. 16 : 17 | |
| 2545. |
A profit of Rs. 30000 is to be distributed among A, B, C in the proportion 3 : 5 : 7. What will be the difference between B’s and C’s shares?. |
| A. | Rs. 2000 |
| B. | Rs. 10000 |
| C. | Rs. 4000 |
| D. | Rs. 14000 |
| Answer» D. Rs. 14000 | |
| 2546. |
If p : q = 3 : 4 and q : r= 8 : 9, then p : r is ? |
| A. | 1: 3 |
| B. | 2 : 3 |
| C. | 3 : 2 |
| D. | 1: 2 |
| Answer» C. 3 : 2 | |
| 2547. |
The compounded ratio of (2 : 3), (6: 11) and (11 :2) is. |
| A. | 1: 2 |
| B. | 11: 24 |
| C. | 2: 1 |
| D. | 36: 121 |
| Answer» D. 36: 121 | |
| 2548. |
The ratio of income of A to that of B is 5 : 4 and the expenditure of A to that of B is 3: 2. If at the end of the year, each saves Rs, 800, the income of A is ? . |
| A. | Rs. 1600 |
| B. | Rs. 2000 |
| C. | Rs. 1800 |
| D. | Rs. 2200 |
| Answer» C. Rs. 1800 | |
| 2549. |
What number should be added to each of the numbers 8, 21, 13 and 31 so that the resulting numbers, in this order form a proportion?. |
| A. | 2 |
| B. | 5 |
| C. | 3 |
| D. | 7 |
| Answer» C. 3 | |
| 2550. |
What number should be subtracted from both the terms of the ratio 15 : 19 so as to make it as 3 : 4 ? |
| A. | 3 |
| B. | 6 |
| C. | 5 |
| D. | 9 |
| Answer» B. 6 | |