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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. |
Which of the following is ferrous alloy?A. InvarB. SolderC. MagnaliumD. Type metal |
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Answer» Correct Answer - A Invar `Fe = 64%` and `Ni = 36%` |
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| 2. |
Heating with carbon in absence of air is known asA. ReductionB. Carbon-reductionC. SmeltingD. Roasting |
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Answer» Correct Answer - B Heating with carbon in absence of air is known as carbon reduction. This is used in Iron metallurgy. `Fe_(2)O_(3) +C overset(("in bla st furnace"))rarr Fe` |
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| 3. |
Explain in brief how ozone layer is getting depleted. |
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Answer» • This layer is established due to an equilibrium between photo dissociation of ozone by UV – radiations and regeneration of ozone. O2 O + O O + O2 O3 (Ozone) But some chemicals / Pollutant react with it and degrade the layer. • Main chemicals to be responsible for destruction of ozone layer are : chlorofluorocarbons (CFCs), halogens (used in fire extinguishers), methane and nitrous oxide. • Out of these, most damaging is the effect of CFCs which are a group of synthetic chemicals and are used as coolants in refrigerators and air conditioners; as cleaning solvents, propellants and sterilant etc. • These CFCs produce “active chlorine” (Cl and ClO radicals) in the presence of UV–radiations. These active chlorine radicals catalytically destroy ozone and convert it into oxygen. As show |
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| 4. |
Self-reduction of `Cu_(2)S` to `Cu` can be carried out in.A. Bessemer converterB. blast furnaceC. both `(a)` and `(b)`D. none of these |
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Answer» Correct Answer - A Matte is obtained in blast furnace and that contains mostly `Cu_(2)S` and `FeS`. It is transferred to Bessemer converter where self-reduction takes place according to the following reactions. `2Cu_(2)S + 3O_(2) rarr 2Cu_(2)O +2SO_(2)`, `2Cu_(2) +Cu_(2)S rarr 6Cu+SO2`. |
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| 5. |
Cyanide proces is used for the extraction ofA. `Au`B. `Cu`C. `Zn`D. `Fe` |
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Answer» Correct Answer - A Gold is leached by cyanide solution |
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| 6. |
In extraction of copper, we useA. `Cu_(2)S`B. PyritesC. Silver argentocyanideD. `CuFeS_(2)` |
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Answer» Correct Answer - D Copper pyrite `CuFeS_(2)`(Chalcopyrite) |
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| 7. |
Aluminothermic process is used for metallurgy ofA. PbB. AgC. AlD. None of these |
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Answer» Correct Answer - D Thermite process is not used for the metallurgy of Pb, Al and Ag . |
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| 8. |
Which of the following metal is obtained by electrolytic reduction process ?A. FeB. CuC. AgD. Al |
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Answer» Correct Answer - D Electrolytic reduction method is used for the highly electropositive elements such as alkali metals, alkaline earth metals and aluminium cannot be extracted by carbon reduction . They are extracted by electrolysis of fused salts . |
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| 9. |
Cyanide proces is used for the extraction ofA. `Au`B. `Ag`C. both `(a)` and `(b)`D. `Cu` |
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Answer» Correct Answer - C Cyanide process is used in the extraction of both silver and gold because these from complex salts with `CN` ion due to presence of line pair of electrons on nitrogen atom. |
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| 10. |
Which one of the following reactions is an example of auto-reduction?A. `Fe_(2)O_(4) to 3Fe+4CO_(2)`B. `Cu_(2)O+ C to 2Cu +CO `C. `Cu^(2+)(aq)+Fe(s) to Cu(s)+Fe^(2+)(aq)`D. `Cu_(2)O+(1)/(2)Cu_(2)S to 3Cu+(1)/(2)SO_(2)` |
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Answer» Correct Answer - D `Cu_(2)O+(1)/(2)Cu_(2) to 3Cu+(1)/(2)SO_(2)` |
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| 11. |
Cryolite is:A. `Na_(3)A1F_(6)`and is used in the electroysis of alumina for decreasing electrial conductivity.B. `Na_(3)A1F_(6)` and is used in the electroysis of alumina for lowering the melting point of alumina.C. `Na_(3)A1F_(6)`and is used in the electroytic purification of alumina.D. `Na_(3)A1F_(6)`and is used in the electroysis of alumina for increasing the melting point and electrical conductivity. |
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Answer» Correct Answer - B Cryolite is `Na_(3)A1F_(6)` and is used in the electroysis of alumina. It reduces the melting point of alumina and increase the electrical conductivity of electrolyte. |
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| 12. |
Select correct matchingA. Pyrometallurgy: Extraction of `Fe`B. Electrometallurgy: Extraction of `A1`C. Hydrometallurgy: Extraction of `Au`D. All of the above are correct |
| Answer» Correct Answer - D | |
| 13. |
Which one of the following reactions is an example of auto-reduction?A. `Fe_(3)O_(4)+4CO to 3Fe+4CO_(2)`B. `Cu_(2)O+C to 2Cu+ CO `C. `Cu^(2+)(aq)+Fe(s) to Cu(s)+Fe^(2+)(aq)`D. `Cu_(2)O+(1)/(2)Cu_(2)S to 3Cu+(1)/(2)SO_(2)` |
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Answer» Correct Answer - D Auto-reduction is also known as self-reduction . This is used when no external reducing agent is required. The sulphide ores of less electropositive metal like Hg, Pb, Cu etc., are heated in air to convert a part of the ore into oxide or sulphide which then reacts with the remaining sulphide ore to given the metal and sulphur dioxide , e.g., `Cu_(2)O+(1)/(2)Cu_(2)S to 3Cu+(1)/(2)SO_(2)` |
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| 14. |
Bauxite ore is concentrated byA. Froth flotationB. Electromagntic separationC. Chemical separationD. Hydraulic separation |
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Answer» Correct Answer - C Chemical separation of Leaching. In this powdered ore is treated with a suitable regent which can dissolve the ore but not the impurities. |
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| 15. |
Magnetite is concentrated byA. gravity methodB. froth floatation processC. electromagnetic methodD. All of the above |
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Answer» Correct Answer - C Magnetite `(Fe_(3)O_(4))` being a magnetic ore of iron can be concentrated by electromagnetic separation. |
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| 16. |
Bauxite ore is concentrated byA. froth floatationB. electromagnetic separationC. chemical separationD. hydraulic separation |
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Answer» Correct Answer - C Bauxite ore is concentrated by chemiccal separation or leaching . In this , powdered ore is treated with a suitable reagent which can dissolved the ore not the impurities. |
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| 17. |
How much energy is given to each coulomb of charge passing through a 6 V battery? |
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Answer» V = W/q W = qV = 1 x 6 = 6 J |
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| 18. |
Under what condition lactic acid is produced in the muscle cells? |
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Answer» Lactic acid is produced when there is lack of oxygen in the muscle cells. |
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| 19. |
What is Tyndall effect? |
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Answer» The phenomenon of scattering of light by the colloidal particles gives rise to tyndall effect. |
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| 20. |
The functions of hormones are given in Column-A and the names of the hormones are given in Column-B. Match them and write the answer along with its letters:Column – AColumn – B(A) Prepares the body to deal with the situation(i) Growth hormone(B) Regulates metabolism for body growth(ii) Testosterone(C) Regulates blood sugar levels(iii) Adrenaline(D) Regulates the growth and development of the body(iv) Progesterone(v) Insulin(vi) Thyroxine(vii) Oestrogen |
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Answer» (A) – (iii) Adrenaline |
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| 21. |
Observe the given figure. Name the eye defect indicated in the figure and also mention the lens used to correct this defect. |
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Answer» (i) Myopia (ii) Concave lens |
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| 22. |
Name the acid present in the stinging hairs of nettle leaves. |
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Answer» Methanoic acid. |
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| 23. |
The roasting reaction in the metallurgy of Cu isA. `CuFeS_(2) to CuO+ Fe_(2)O_(3) +SO_(2)`B. `2CuFeS_(2)+O_(2) to Cu_(2)S+2FeS+O_(2)`C. `CuFeS_(2) to Cu_(2)O +Fe_(2)O_(3) +SO_(2)`D. None of the above |
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Answer» Correct Answer - B `2CuFeS_(2) +4O_(2) overset (5[O])to Cu_(2)S+2FeS+SO_(2)` is the roasting reaction in Cu metallugy . |
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| 24. |
A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of electric charge that flows through the circuit. |
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Answer» Given I = 0.5 A, t = 10 min. = 10 x 60 = 600 sec As we know, I = Q/t Q = It = 0.5 x 10 x 60 = 300C |
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| 25. |
What is roasting in metallurgy? |
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Answer» The sulphide ores are converted into oxides by heating strongly in the presence of excess air. |
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| 26. |
Meat is easier to digest as compared to grass. Why? |
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Answer» It is easier to digest meat because our digestive juices contain enzymes which can easily digest meat but our body does not digest cellulose which is main component of grass. |
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| 27. |
Convex mirror is commonly used as rear – view mirror in vehicles. Why? |
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Answer» (i) They always give an erect diminished image. (ii) Also they have a wider field of view as they are curved outwards. |
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| 28. |
Convex mirror is commonly used as rear view mirror in vehicles. Why? |
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Answer» (i) They always give an erect diminished image. (ii) Also they have a wider field of view as they are curved outwards. |
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| 29. |
Define accommodation of an eye? |
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Answer» The ability of the eye to focus both near and distant objects by adjusting the focal length is called accommodation of the eye. |
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| 30. |
What is Hardy- Weinberg law. |
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Answer» Hardy–Weinberg Law States that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences. These influences include genetic drift, mate choice, assortative mating, natural selection, sexual selection, mutation, gene flow, meiotic drive, genetic hitchhiking, population bottleneck, founder effect and inbreeding. |
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| 31. |
What happens if fallopian tube is blocked? |
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Answer» If fallopian tube is blocked the egg will not be able to reach the uterus in such case fertilization will not take place. |
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| 32. |
The heart of fish is said to be a venous heart, whether your heart is a venous one or not? Justify. |
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Answer» The heart of fish is a venous heart, because it is a 2 chambered heart and only deoxygenated blood flows through the heart chambers. Human heart is four chambered heart and carry both oxygenated and deoxygenated blood. So human heart is not a venous heart. |
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| 33. |
During a clinical check-up doctor diagnosed that the patient’s heart murmurs. 1. What are murmurs? 2. Why does a heart murmur?3. The heart sound ‘dub’ is caused by the closure of AV valve. Do you agree with this statement? |
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Answer» 1. Due to the abnormalities in chambers or valves of the heart, some abnormal sounds may be audible in addition to normal heart sound. These are called murmurs. 2. Heart may murmur due to valvular damage. 3. The statement is incorrect because ‘dub’ is caused by the sudden closure of semilunar valve. |
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| 34. |
Observe the diagram1. Identify the blood cell A and B.2. How can they differentiate? 3. What are their function? |
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Answer» 1. The blood cells A and B
2. They can be differentiated in two ways
3. Their functions
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| 35. |
Observe the diagram given below and answer the questions. 1. Identify the type of circulation. 2. Prepare a ow chart showing the above circulation. 3. Write the purpose of this circulation. |
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Answer» 1. Pulmonary circulation 2. Right, ventricle → Pulmonary artery → lungs → Pulmonary vein → Left auricle 3. Oxygenation of blood |
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| 36. |
A. Trichoderma sp. against certain plant pathogensB. Nucleopolyhedrvirus against white rustC. Bt-cotton to improve yieldD. none |
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Answer» Correct answer is option (A) i.e Trichoderma sp. against certain plants pathogens Explanation: A biological control being developed for use in the treatment of plant disease is the fungus Trichoderma. Trichoderma species are free living fungi that are very common in the root ecosystems. They are effective biocontrol agents of several plant pathogens. Nucleopolyhedrovirus are also used as biocontrol agent but not against white rust of Brassica. |
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| 37. |
Leukocytes are the soldiers of the body. Justify? |
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Answer» Leukocytes provides defence mechanism to the body against infection. For example Neutrophils and monocytes are phagocytic cells which destroy foreign organisms entering the body. Basophils secrete histamine, heparin etc. and are involved in inflammatory reactions. Eosinophils resist infections and are also associated with allergic reactions. Lymphocytes are responsible for immune responses of the body. |
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| 38. |
Why do we consider blood as a connective tissue? |
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Answer» Blood is considered a connective tissue for two basic reasons: 1. embryologically, it has the same origin (mesodermal) as do the other connective tissue types and 2. Blood connects the body systems together bringing the needed oxygen, nutrients, hormones and other signaling molecules, and removing the wastes. |
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| 39. |
Sino-atrial node is called the pacemaker of our heart. Why? |
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Answer» Sino-atrial node is a bundle of nerves which initiates the conduction of heartbeat. So, this is also called the pacemaker of our heart. |
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| 40. |
What is the significance of atrioventricular node and atrioventricular bundle in the functioning of heart? |
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Answer» AV Node and atrioventricular bundles are responsible for conduction of cardiac beat cycle to further parts of heart. |
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| 41. |
A female undergoing IVF treatment has blocked fallopian tubes. The technique by which the embryo with more than 8 blastomeres will be transferred into the female for further development is A. ZIFT B. GIFT C. IUT D. AI |
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Answer» Correct option is B. GIFT |
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| 42. |
The mode of action of the copper ions in an IUD is to A. increase the movement of sperms. B. decrease the movement of the sperms. C. make the uterus unsuitable for implantation. D. make the cervix hostile to the sperms. |
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Answer» Correct option is B. decrease the movement of the sperms |
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| 43. |
To produce 400 seeds, the number of meiotic divisions required will be A. 400 B. 200 C. 500 D. 800 |
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Answer» Correct option is C. 500 |
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| 44. |
A cross is made between tall pea plants having green pods and dwarf pea plants having yellow pods. In the F2 generation, out of 80 plants how many are likely to be tall plants? A. 15 B. 20 C. 45 D. 60 |
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Answer» Correct option is D. 60 Out of 9:3:3:1 = 16 9+3 will be tall. Therefore, 12/16 x 80 = 60. |
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| 45. |
In Antirrhinum, RR is phenotypically red flowers, rr is white and Rr is pink. Select the correct phenotypic ratio in F1 generation when a cross is performed between RR X Rr: A. 1 red: 2 Pink: 1 white B. 2 Pink: 1 white C. 2 Red: 2 Pink D. All Pink |
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Answer» Correct option is C.2 Red: 2 Pink |
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| 46. |
What would be the genotype of the parents if the offspring have the phenotypes in 1:1 proportion? A. Aa X Aa B. AA X AA C. Aa X AA D. Aa x aa |
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Answer» Correct option is D. Aa x aa |
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| 47. |
What is the pattern of inheritance in the above pedigree chart? A. Autosomal dominant B. Autosomal recessive C. Sex -linked dominant D. Sex -linked recessive |
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Answer» Correct option is B. Autosomal recessive |
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| 48. |
What are mini satellites? A. 10-40 bp sized small sequences within the genes B. Short coding repetitive region on the eukaryotic genome C. Short non-coding repetitive sequence forming large portion of eukaryotic genome D. Regions of coding strands of the DNA |
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Answer» Correct option is C. Short non-coding repetitive sequence forming large portion of eukaryotic genome |
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| 49. |
A couple has two daughters. What is the probability that the third child will also be a female? A. 25% B. 50% C. 75% D. 100% |
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Answer» Correct option is B. 50% |
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| 50. |
Genotypic ratio of 1:2:1 is obtained in a cross between A. AB X AB B. Ab X Ab C. Ab X ab D. ab X ab |
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Answer» Correct option is B. Ab X Ab |
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