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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The atomic number of vanadium `(V)`, chromium `(Cr)`, manganese `(Mn)` and iron `(Fe)` are respectively `23,24,25,26`. Which out of these may be expected to have the jump in second ionisation enthalpy?A. (a)`Mn`B. (b)`Fe`C. (c )`V`D. (d)`Cr` |
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Answer» Correct Answer - D `Cr` has `3d^(5), 4s^(1)` configuration and thus second electron is removed from 3d-subshell. Rest all from 4s-subshell. |
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| 2. |
Calculate the value of `Z_("eff")` for 3d electron of `._(21)Sc`.A. `18.69`B. `21.69`C. `3.69`D. `3.00` |
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Answer» Correct Answer - D `Sc : (1s^(2)) (2s^(2) 2p^(6)) (3s^(2) 3p^(6)) underset(n^(th))(3d^(1))` `sigma_(3d) = (0 xx 0.35) + 18 xx 1.00` `= 18.0` `Z_("eff") = Z - sigma` `= 21 - 18.0 = 3.0` |
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| 3. |
Identify the correct order of conductivity in an aqueous solution. [Where M is the d-block metal]A. `[M (H_(2)O)_(x)]^(+2) gt [M(H_(2)O)_(y)]^(+4)`B. `[M(H_(2)O)_(x)]^(+2) gt [M(H_(2)O)_(y)]^(+4)`C. `[M(H_(2)O)_(x)] = [M(H_(2)O)_(y)]^(+4)`D. we can not predict |
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Answer» Correct Answer - A Conductivity `prop` change on ion `prop` no. of ions produced in aq. Solution |
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| 4. |
The atomic numbers of vanasium (V) Chormium (Cr), manganese (Mn) and iron (Fe) respectively `23, 24, 25` and 26.which one of these may be expected to have the higher seconds ionization enthalpy ?A. CrB. MnC. FeD. V |
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Answer» Correct Answer - A `underset(3d^(3) 4s^(2))(V)" " underset(3d^(5)4s^(1))(Cr)" "underset(3d^(5)4s^(2))(Mn)" " underset(3d^(6)4s^(2))(Fe)` In case of Chrominum, the second electron will be removed from extra stable half filled configuration `Cr^(+) = 3d^(5) 4s^(0)` |
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| 5. |
To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? Illustrate youranswer with examples. |
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Answer» The elements in the first-half of the transition series exhibit many oxidation states with Mn |
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| 6. |
The ore having two different metal atoms isA. HaematiteB. GalenaC. MagnetiteD. Copper pyrites |
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Answer» Correct Answer - D Copper pyrites : `CuFeS_(2)`, i.e. contains `Cu` and `Fe`. |
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| 7. |
Assertion : Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason : Copper is extracted by hydrometallurgy.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If the assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - B Only low garde copper is extracted by hydrometallurgy. |
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| 8. |
`DeltaG^(Ө)` vs T plot in Ellingham diagram slopes downward for the reaction .A. `Mg + (1)/(2) O_(2) rarr MgO`B. `2Ag + (1)/(2) O_(2) rarr Ag_(2) O`C. `C + (1)/(2) O_(2) rarr CO`D. `CO + (1)/(2) O_(2) rarr CO_(2)` |
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Answer» Correct Answer - C `C(s) + (1)/(2) O_(2(g)) rarr CO_((g)) , Delta S` increase. Hence, as the temperature increases, `T Delta S` increases and hence `Delta G(Delta H - T Delta S)` decreases. In other words. The slope of the curve for formation of `CO` decreases. Howeve, for all other oxides, it increases. |
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| 9. |
Assuming complete recovery of metal, which of the following ores would yield a greater quantity of copper ? (a) An ore azurite `(Cu(OH)_(2).2CuCO_(3))` containing 3.30% (by mass) (b) An ore chalcopyrite `CuFeS_(2)` containing 4.95% (by mass). |
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Answer» (a) `Cu(OH)_(2).2CuCO_(3)=3` `3xx63.5+2+12+8xx16+2xx13xx63.5=190.5g`. =344.5 g 344.5 g of ore contain Cu =190.5g 0.033 g of ore contains `Cu=((190.5g))/((344.5g))xx(0.033g)=0.0182g` (b) `CuFeS_(2)-=Cu` `63.5+56+2xx32=63.5g` 0.0495g of ore contains `Cu=((63.5g))/((183.5g))xx(0.0495g)=0.171 g` The ore azurite contains greater amount of copper. |
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| 10. |
`2CuCO_(3).Cu(OH)_(2)` is the formula ofA. ChalcopyriteB. malachiteC. SideriteD. Arzurite |
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Answer» Correct Answer - D It is netural basic copper `(II)` carbonate `2CuCO_(3).Cu(OH)`. Having an intense blue colour it is used as gemstone. |
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| 11. |
The most important copper oxide containing minerals are azurite `{Cu_(3)(OH)_(2)(CO_(3))_(2)}`, malachite `{Cu_(2)(OH)_(2)(CO_(3))}`, cuprite `(Cu_(2)O)`, tenorite `(CuO)`. Extraction of copper from these low grade ores involves leaching followed by reduction `"Azurite" overset(H_(2)SO_(4)(aq))rarrunderset((A))("solution") overset(KCN)rarrpptooverset(KCN)underset((excess))rarrunderset((B))("solution ")` Select the INCORRECT statement:A. Solution (A) contains coloured speciesB. Solution (B) contains paramgnetic speciesC. Solution (B) contains colcurless speciesD. Solution (B) contains c0-ordination species |
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Answer» Correct Answer - B `Cu_(2)(OH)_(2)(CO_(3))+2H_(2)SO_(4)rarr2underset((A))(CuSO_(4))+CO_(2)+H_(2)O` `CuSO_(4)+2KCNrarrK_(2)SO_(4)+Cu underset((yellow))((CN)_(2))darr` `Cu(CN)_(2)rarrCuCNdarr+(CN)_(2)uarr` `CuCN+.^(-)CNrarr[Cu underset((B))((CN)_(4))]^(3-)` |
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| 12. |
The most important copper oxide containing minerals are azurite `{Cu_(3)(OH)_(2)(CO_(3))_(2)}`, malachite `{Cu_(2)(OH)_(2)(CO_(3))}`, cuprite `(Cu_(2)O)`, tenorite `(CuO)`. Extraction of copper from these low grade ores involves leaching followed by reduction Malachite `("leached")/("with bacteria") ("solution")` `Cu` can be extracted from solution on treatment with:A. `Ag`B. `FeO`C. `H_(2)`D. `H_(2)SO_(4)` |
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Answer» Correct Answer - C ` Cu^(+2)(aq.)+H_(2)rarrCu+2H^(+)` |
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| 13. |
The most important copper oxide containing minerals are azurite `{Cu_(3)(OH)_(2)(CO_(3))_(2)}`, malachite `{Cu_(2)(OH)_(2)(CO_(3))}`, cuprite `(Cu_(2)O)`, tenorite `(CuO)`. Extraction of copper from these low grade ores involves leaching followed by reduction. Some `Cu` is obtained just on leaching by dil `H_(2)SO_(4)` in :A. MalachiteB. TenoriteC. CupriteD. Azurite |
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Answer» Correct Answer - C `Cu_(3)(OH)_(2)(CO_(3))_(2)+3H_(2)SO_(4)rarr3CuSO_(4)+2CO_(2)+4H_(2)O` `CuO+H_(2)SO_(4)rarrCuSO_(4)+H_(2)O` `Cu_(2)O+H_(2)SO_(4)rarrCu+CuSO_(4)+H_(2)O` `[Cu^(+)(aq) "disproportionates in aq. Solution" (Cu^(+)(aq.)rarrCu+Cu^(+2))|` |
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| 14. |
`x,y` and `z` in the following processes are respectively: (i) `P_(2)O_(5)+……..x…………rarrCa_(3)(PO_(4))_(2)` (ii) `2Cu_(2)O +Cu_(2)Srarr…….y………+SO_(2)uarr` (iii) `Fe_(2)O_(3) +3COrarr…….z……..+3CO_(2)uarr`A. `3Ca,CuSO_(4),Fe`B. `3Ca(OH)_(2),6Cu, FeO`C. `3CaO,6Cu,2Fe`D. `3CaO_(2),CuS,FeO` |
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Answer» Correct Answer - C `{:((i)P_2O_5+3Ca(OH)_2,,rarr,,Ca_3underset((X))((PO_4)_2)),((ii)2Cu_2O+Cu_2S,,rarr,,6Cu+underset((Y))(SO_2uarr)),((iii)Fe_2O_3+3CO,,rarr,,FeO+underset((Z))(3CO_2uarr)):}` |
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| 15. |
Malachite on calcination gives `rarr ‘A’ +CO_(2) +H_(2)O`. Compound `‘A’` on reduction with carbon gives `rarr CO+ ‘B’`. Here ‘A’ and ‘B’are:A. `Fe_(2),O_(3),Fe`B. `CuO,Cu`C. `CuCO_(3),CuO`D. `MgO,Mg` |
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Answer» Correct Answer - B `Cu(OH)_(2).CuCO_(3)rarr CUOunderset((a))+CO_(2) +H_(2)O` `CUOunderset((b))+CrarrCO+Cu` |
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| 16. |
Haryana comes second after ______ in cattle breeding in India.1. Karnataka2. Punjab3. Gujarat4. Tamil Nadu |
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Answer» Correct Answer - Option 3 : Gujarat The correct answer is Gujarat.
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| 17. |
When secretory activity in the thyroid gland increases A. The gland takes up iodide from the blood at a faster rate. B. Its follicles enlarge and fill with colloid. C. The follicular cells become more columnar. D. The follicular cells ingest colloid by endocytosis. E. The blood level of thyrotropin (TSH) increases. |
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Answer» A. True Iodide uptake is an index of activity. B. False The follicles shrink as the colloid content falls. C. True They change from cuboidal to columnar as their activity increases. D. True Reabsorption lacunae form as thyroglobulin is broken down to release hormones. E. False Negative feedback causes TSH levels to fall. |
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| 18. |
Removal of the thyroid gland (without replacement therapy) leads to an increased A. Blood TSH level. B. Blood cholesterol level. C. Blood glucose level during an oral glucose tolerance test. D. Response time for tendon reflexes. E. Tremor of the fingers. |
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Answer» A. True Due to loss of negative feedback to the pituitary. B. True Due mainly to a reduction in cholesterol excretion. C. False The curve is flattened due to slow absorption of glucose. D. True The ‘hung up’ ankle jerk is a good example. E. False Tremor is a feature of hyperthyroidism. |
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| 19. |
Formation of silicon oxide during hot rolling of TRIP steel, ______ surface finish a. increases b. decreases c. does not affect d. exponentially improves |
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Answer» Formation of silicon oxide during hot rolling of TRIP decreases steel surface finish. |
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| 20. |
Copper Matte is extracted from copper pyrites ore by heating it in blast furnace. The method is based on the principle that:A. copper has more affinity for oxygen than for sulphur at high temperatureB. iron has less affinity for oxygen than for sulphur at high temperatureC. sulphur has less affinity for oxygen at high temperatureD. copper has less affinity for oxygen than for sulphur at high temperature. |
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Answer» Correct Answer - A Extraction of copper from copper pyrites ore `(Cu_(2)S)` is based on the fact that copper has more affinity for oxygen than for sulphur at high temperature. |
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| 21. |
Copper Matte is extracted from copper pyrites ore by heating it in blast furnace. The method is based on the principle that:A. copper has more affinity for oxygen than sulphur at high temperatureB. iron has less affinity for oxygen than sulphur at high temperatureC. sulphur has less affinity for oxygen at high temperatureD. copper has less affinity for oxygen than sulphur at high temperature |
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Answer» Correct Answer - D `2CuFeS_(2) +O_(2) rarr Cu_(2)S +2FeS +SO_(2)` `FeS +(3)/(2)O_(2) rarr FeO +SO_(2)uarr` `FeO +SiO_(2)rarr FeSiO_(3)` (Remain `Cu_(2)S` is called mette) |
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| 22. |
Discuss the various techniques adopted in cattle breeding? |
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Answer» Methods of Animal breeding: There are two methods of animal breeding, namely inbreeding and outbreeding 1. Inbreeding: Breeding between animals of the same breed for 4-6 generations is called inbreeding. Inbreeding increases homozygosity and exposes the harmful recessive genes. Continuous inbreeding reduces fertility and even productivity, resulting in “inbreeding depression”. This can be avoided by breeding selected animals of the breeding population and they should be mated with superior animals of the same breed but unrelated to the breeding population. It helps to restore fertility and yield. 2. Outbreeding: The breeding between unrelated animals is called outbreeding. Individuals produced do not have common ancestors for 4-6 generations. Outbreeding helps to produce new and favourable traits, to produce hybrids with superior qualities and helps to create new breeds. New and favourable genes can be introduced into a population through outbreeding. (I) Out crossing: It is the breeding between unrelated animals of the same breed but having no common ancestry. The offspring of such a cross is called outcross. This method is suitable for breeding animals that are below average in productivity. (II) Cross breeding: Breeding between a superior male of one breed with a superior female of another breed. The cross bred progeny has superior traits (hybrid vigour or heterosis.) (III) Interspecific hybridization: In this method of breeding mating is between male and female of two different species. The progeny obtained from such crosses are different from their parents, and may possess the desirable traits of the parents. Mule was produced by the process of interspecific hybridization between a male donkey and a female horse. |
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| 23. |
Thyroid-stimulating hormone (TSH) secretion is increased A. After partial removal of the thyroid gland. B. In infants born without a thyroid gland. C. When metabolic rate falls. D. In starvation. E. When the diet is deficient in iodine. |
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Answer» A. True Due to a reduction in pituitary inhibition by circulating thyroxine. B. True Due to absence of the normal pituitary inhibition by circulating thyroxine. C. False TSH and thyroxine influence metabolic rate, not vice versa. D. False The level falls, which tends to conserve energy. E. True Due to inadequate manufacture of thyroxine, pituitary inhibition is reduced. |
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| 24. |
Free carbon in iron makes the metal A. Soft and gives a coarse grained crystalline structure B. Soft and gives a fine grained crystalline structure C. Hard and gives a coarse grained crystalline structure D. Hard and gives a fine grained crystalline structure |
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Answer» A. Soft and gives a coarse grained crystalline structure |
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| 25. |
Write a detailed account of gastro intestinal tract hormones? |
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Answer» Group of specialized endocrine cells present in gastro – intestinal tract secretes hormones such as gastrin, cholecystokinin (CCK), secretin and gastric inhibitory peptides (GIP). Gastrin acts on the gastric glands and stimulates the secretion of HCl and pepsinogen. Cholecystokinin (CCK) is secreted by duodenum in response to the presence of fat and acid in the diet. It acts on the gall bladder to release bile into duodenum and stimulates the secretion of pancreatic enzymes and its discharge. Secretin acts on acini cells of pancreas to secrete bicarbonate ions and water to neutralize the acidity. Gastric inhibitory peptide (GIP) inhibits gastric secretion and motility. |
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| 26. |
The product from blast furnace is called A. Cast Iron B. Wrought Iron C. Pig Iron D. Steel |
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Answer» The product from blast furnace is called Pig Iron. |
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| 27. |
For a coordination number of four, anion sits at the center of where corners are occupied by cations (a) Tetrahedron (b) Cube (c) Octahedron (d) Triangle |
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Answer» (a) Tetrahedron |
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| 28. |
The room temperature stress-strain curve of martensite phase of shape memory alloy looks like that of a. ceramic b. elastomer c. glass d. tungsten |
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Answer» b. elastomer |
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| 29. |
According to TTT diagram of γ transformation, all the γ is transformed into martensite at (a) Subcritical temperature(b) Slow cooling rate (c) Critical cooling rate (d) Lower than critical cooling rate |
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Answer» (c) Critical cooling rate |
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| 30. |
Strain induced martensite transformation occurs at high strains to ______ necking instability a. Increase b. decrease c. not to affect d. exponentially increase |
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Answer» Strain induced martensite transformation occurs at high strains to decrease necking instability. |
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| 31. |
In which of the following methods, surface of a steel component becomes hard due to phase transformation of austenite to martensite? A. Carbonitriding B. Flame hardening C. Induction hardening D. Cyaniding |
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Answer» B. Flame hardening |
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| 32. |
During austenite to martensite transformation of shape memory alloys, a. Chemical composition changes b. composition does not change c.slip occurs d. dislocation movement occurs |
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Answer» b. composition does not change |
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| 33. |
During subcritical isothermal treatment of TRIP steel, carbon content in ferrite a. increases b. decreases c. not affected d. none of the above |
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Answer» b. decreases |
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| 34. |
Dual phase steel consists only of a. Ferrite+austenite b. Ferrite+bainite c. bainte+austenite d. ferrite + martensite |
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Answer» d. ferrite + martensite |
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| 35. |
Which of the following processes permit the transformation of austenite to martensite, throughout the cross-section of a component without cracking or distortion? A. Martempering B. Marquenching C. Austempering D. Martempering and Marquenching |
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Answer» D. Martempering and Marquenching |
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| 36. |
During subcritical isothermal treatment of TRIP steel, carbon content in austenite a. increases b. decreases c. not affected d. none of the above |
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Answer» a. increases |
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| 37. |
Austenite phase in Iron-Carbon equilibrium diagramA. Is face centered cubic structure B. Has magnetic phase C. Exists below 727°C D. Has body centered cubic structure |
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Answer» A. Is face centered cubic structure |
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| 38. |
As the carbon content in austenite increases, the martensite start temperature a. increases b. decreases c. not affected d. none of the above |
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Answer» b. decreases |
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| 39. |
Austenite is transformed between 500 and 300 °C to (a) Coarse pearlite (b) Martensite (c) Bainite (d) Retain austenite only |
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Answer» (c) Bainite . |
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| 40. |
Maximum percentage of carbon in austenite is A. 0.025% B. 0.8%C. 1.25% D. 1.7% |
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Answer» Maximum percentage of carbon in austenite is 1.7%. |
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| 41. |
Pearlite is a combination of A. Ferrite and cementite B. Ferrite and austenite C. Ferrite and iron graphite D. Pearlite and ferrite |
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Answer» A. Ferrite and cementite |
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| 42. |
Austenite is a combination of A. Ferrite and cementite B. Cementite and gamma iron C. Ferrite and austenite D. Pearlite and ferrite |
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Answer» B. Cementite and gamma iron |
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| 43. |
Peritectic reaction is A. Solid ⇔ Liquid + Solid B. Liquid + Solid1⇔ Solid2 C. Solid1⇔ Solid2 + Solid3 D. Liquid ⇔ Solid1 + Solid2 |
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Answer» B. Liquid + Solid1⇔ Solid2 |
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| 44. |
0.5 % C steel is called A. Hypoeutectoid steel B. Hyper eutectoid steel C. Eutectoid steel D. Eutectic steel |
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Answer» A. Hypoeutectoid steel |
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| 45. |
The enzyme catalyzing conversion of androstenedione to testosterone is a (A) Oxygenase (B) Dehydrogenase (C) Isomerase (D) Decarboxylase |
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Answer» (C) Isomerase |
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| 46. |
An androgen which is more powerful than testosterone is (A) Androstenedione (B) Dihydrotestosterone (C) Androsterone (D) Epiandrosterone |
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Answer» (B) Dihydrotestosterone |
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| 47. |
Urinary 17 ketosteroids(A) Are not found in women (B) Reflect the total production of androgenic substances (C) Indicate the total production of sex hormone (D) Are highly active androgens |
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Answer» (B) Reflect the total production of androgenic substances |
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| 48. |
PTH causes all of the following except (A) Increased intestinal absorption of calcium (B) Increased intestinal absorption of phosphate (C) Increased tubular reabsorption of calcium (D) Increased tubular reabsorption of phosphate |
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Answer» (D) Increased tubular reabsorption of phosphate |
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| 49. |
When iodine supplies are sufficient the T3 and T4 ratio in thyroglobulin is (A) 1 : 2 (B) 1 : 4 (C) 1 : 7 (D) 1 : 10 |
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Answer» Correct option (D) 1 : 10 |
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| 50. |
The metabolites of androgens are (A) 17-Hydroxysteroids (B) 17-Ketosteroids (C) 11-Hydroxysteroids (D) 11-Ketosteroids |
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Answer» (B) 17-Ketosteroids |
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