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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. |
Consider the following satements : `S_(1): ` Generally square planare complexes show geometrical isomerism but do not exhibit optical isomerism because thy do not possess plane of symmetry . `S_(2): Delta_(t)=(4)/(9)Delta_(0)` `S_(3)`: In octahedral complexes each electron entering teh `t_(2g)` orbitals stabilizes the complex ion by 0.4 `Delta_(0)` and each electron entering teh `e_(g)` orbital destabilizes the complex by an amount of 0.6 `Delta_(0)` Select the correct statement from the codes given below.A. F T TB. F F TC. T F TD. T T F |
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Answer» Correct Answer - A `S_1`:has plane of symmetry, therefore, does not show optical isomerism. `S_2` and `S_3` are correct statements. |
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| 2. |
Describe the importance of the following: (a) limestone, (b) cement and ( c) plaster of Paris. |
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Answer» a. Limestone: Specially precipitated `CaCO_(3)` is extensively used in the manufacture of high quality paper. It is also used as an antacid, mild abrasive in toothpaste, a constituent of chewing gum and as a filler in cosmetics. Cement: It is an important building material. It is used in concreate and reinforced concerte, in plastering and in the construction of bridges, dams and buildings. c. Plaster of Paris: It is extensively used in the building industry as well as in plasters. It is used in dentistry, in ornamental work and for taking the casts of statues and busts. It is also used for immobilising the affected part of organ where there is bone fracture or sprain. |
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| 3. |
Sulfide ores are common for the metals.A. `Ag,Cu` and `Pb`B. `Ag,Cu` and `Sn`C. `Ag,Mg` and `Pb`D. `Al,Cu` and `Pb` |
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Answer» Correct Answer - A Sulphide ores of `Ag,Pb` and `Cu` are, respectively, argentite `(Ag_(2)S)`, galena `(PbS)` and copper glance `(Cu_(2)S)`. |
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| 4. |
The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of megnesium and calcium are sparingly soluble in water. Explain. |
| Answer» Due to larger size of `Na` and `K` as compared to that of `Mg` and `Ca`,the lattice enthalpies of hydroxides and carbonates of sodium and potassium are much lower than those of the hydroxides and carbonates of magnesium and calcium. As a result, the hydroxides of `Na` and `K` are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly in water. | |
| 5. |
A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong? |
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Answer» An n-type semiconductor conducts because of the presence of extra electrons. Therefore, a group 14 element can be converted to n-type semiconductor by doping it with a group 15 element. |
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| 6. |
Non-stoichiometric cuprous oxide. `Cu_(2)O` can be perpared in laboratory. In this oxide, copper-to-oxygen ratio is slightly less than 2 : 1. can you account for the fact that this substance is a p-type semiconductors? |
| Answer» `Cu_(2) O` is a non-stoichimetric oxide in which the mole of `Cu` are less than 2, i.e., there is metal deficiency which create hole. Such hole can move through crystals like a positive charge giving rise to electrical conductivity. The direction of motion of the holes in an electric field is opposite to that of the electron. This behaves like p-type smiconductor in which group-13-doped crystals is silicon are called p-type semiconductors since holes (positive in charge) appear to be responsible for the semiconductors properties. | |
| 7. |
Select the correct statement, for non stoichiometric cuprous oxide `Cu_(1.8)O`.A. `%` of `Cu^(2+)` in total copper is `11.11%`B. `%` of `Cu^(1+)` in total copper is `11.11%`C. It behaves like `p`-type semiconductorD. Defect is metal deficiency defect |
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Answer» Correct Answer - A::C::D Say, number of `Cu^(2+)` ions `=x` Number of `Cu^(+)` ions `=1.8-x` `:.x xx 2+ (1.8-x)xx1=1xx2` `x+1.8-x=2` `=x=2-1.8` `x=0.2` `%` of `Cu^(2+)=0.2/1.8xx100=11.11` `%` of `Cu^(1+)=88.89` |
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| 8. |
Identify Z in the following reaction sequence. `CH_(3)Iunderset("Ether")overset(Mg)rarrXunderset(H_(3)O^(+))overset("Dry ice")rarr Y underset("Red P")overset(Cl_(2))rarrZ`A. `CH_(3)COOH`B. `CH_(3)Mgl`C. `CH_(3)COCl`D. `ClCH_(2)COOH` |
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Answer» Correct Answer - 4 `CH_(3)I underset("Ether")overset(Mg)rarrCH_(3)MgI underset(H_(2)O^(+))overset("Dry ice")rarrCH_(3)COOHunderset("Red P")overset(Cl_(2))rarrunderset((alpha-"halogenation"))(Cl-CH_(2)-COOH)` |
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| 9. |
Why do aldehydes and ketones have lower boiling point than alcohols ? |
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Answer» Due to presence of associated molecules with H-bonding in alcohols. |
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| 10. |
Absolute alcohol cannot be obtained by simple fractional distillation because: (1) Pure C2H5OH is unstable (2) C2H5OH forms hydrogen bonding with water (3) Boiling point of C2H5OH is very close to that of water (4) Constant boiling point azeotropic mixture is formed with water |
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Answer» Absolute alcohol cannot be obtained by simple fractional distillation because Constant boiling point azeotropic mixture is formed with water |
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| 11. |
A compound (X) of the formula C3H8O yields a compound C3H6O on oxidation. To which of the following class of compounds could (X) belong? (1) Aldehyde (2) Secondary alcohol (3) Alkene (4) Tertiary alcohol |
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Answer» (2) Secondary alcohol |
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| 12. |
Vitamin A, D, E and K are fat soluble vitamins. Write the deficiency diseases and resources of these vitamins in a tabular form. |
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| 13. |
Which of the following is not correct?(a) Robert Brown discovered the cell.(b) Schleiden and Schwann formulated the cell theory.(c) Virchow explained that cells are formed from pre-existing cells.(d) A unicellular organism carries out its life activities within a single cell. |
| Answer» (a) Robert Brown did not discover the cell. The cell was discovered by Robert Hook. | |
| 14. |
Which of the following is correct:(a) Cells of all living organisms have a nucleus.(b) Both animal and plant cells have a well defined cell wall.(c) In prokaryotes, there are no membrane bound organelles.(d) Cells are formed de novo from abiotic materials. |
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Answer» (c) Membrane-bound organelles are organelles surrounded by a double membrane. Nucleus, mitochondria, chloroplasts, etc., are examples of such organelles. These cell organelles are absent from prokaryotes. |
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| 15. |
New cells generate from(a) bacterial fermentation (b) regeneration of old cells(c) pre-existing cells (d) abiotic materials |
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Answer» (c) According to the biogenic theory, new cells can only arise from pre-existing cells.Only complete cells, in favourable conditions, can give rise to new cells. |
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| 16. |
What are epitope and paratope? |
| Answer» Epitope is antigenic determinant which is present on the antigens and paratrope is antigen binding site that is present on the antibodies. | |
| 17. |
A person is infected by HIV. How will you diagnose for AIDS? |
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Answer» A simple blood test is available that can determine whether the person has been infected with HIV. The ELISA test (Enzyme Linked Immunosorbent Assay) detects the presence of HIV antibodies. It is a preliminary test. Western blot test is more reliable and a confirmatory test. It detects the viral core proteins. If both tests detect the presence of the antibodies, the person is considered to be HIV positive. |
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| 18. |
Where is the headquaters of SWIFT (society of worldwide Interbank Financial Telecommunication) located?A. Vienna, AustriaB. Brussels, BelgiumC. Montreal, CanadaD. Durban, South Africa |
| Answer» Correct Answer - B | |
| 19. |
Select the followoing statements which is not correct about Society for Worldwide Interbank Financial Telecommunication(SWIFT)A. It facilitates network for financial institutionsB. It also facilitates funds transferC. The majority of international interbank messages use this networkD. SWIFT was founded in Brussels in 1973 |
| Answer» Correct Answer - B | |
| 20. |
Explain in brief the role of animal husbandry in human welfare. |
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Answer» Animal husbandry deals with the scientific management of livestock. It includes various aspects such as feeding, breeding, and control diseases to raise the population of animal livestock. Animal husbandry usually includes animals such as cattle, pig, sheep, poultry, and fish which are useful for humans in various ways. These animals are managed for the production of commercially important products such as milk, meat, wool, egg, honey, silk, etc. The increase in human population has increased the demand of these products. Hence, it is necessary to improve the management of livestock scientifically. |
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| 21. |
In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided? |
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Answer» Many factors are responsible for motivating youngsters towards alcohol or drugs. Curiosity, need for adventure and excitement, experimentation are the initial causes of motivation. Some youngsters start consuming drugs and alcohol in order to overcome negative emotions (such as stress, pressure, depression, frustration) and to excel in various fields. Several mediums like television, internet, newspaper, movies etc. are also responsible for promoting the idea of alcohol to the younger generation. Amongst these factors, reasons such as unstable and unsupportive family structures and peer pressure can also lead an individual to be dependent on drugs and alcohol.
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| 22. |
(a) Write the scientific names of the source plants from where opioids and cannabinoids are extracted. (b) Write their receptor sites in the human body. How do these drugs affect the human beings? |
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Answer» (a). Opioids are obtained from Papaver sominiferum. Cannabinoids are obtained from Cannabis sativa. (b). The receptors of opioids present in our central nervous system and gastro- intestinal tract. The receptors of cannabinoids principally present in the brain They also effect on the cardiovascular system. |
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| 23. |
Here are the terms of different kinds of vessels: yacht, boat, canoe, ship, steamer, schooner. Think of similar terms in your language. |
| Answer» „Naav‟, „Nauka‟, „Jahaaz‟ and „Kishti‟ are some of the various words used in Hindi for the word „boat‟. | |
| 24. |
A sea voyage for pleasure is ______. A) by sea B) ship C) seashore D) cruise E) sea steamer |
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Answer» Correct option is D) cruise |
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| 25. |
PCR proceeds in three distinct steps governed by temperature, they are in order of ________. (a) Denaturation, Annealing, Synthesis (b) Synthesis, Annealing, Denaturation (c) Annealing, Synthesis, Denaturation (d) Denaturation, Synthesis, Annealing |
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Answer» PCR proceeds in three distinct steps governed by temperature, they are in order of Denaturation, Annealing, Synthesis. |
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| 26. |
A disease that can be transmitted by an infectious agent from one individual to another was called a. Epidemic b. Pandemic c. Communicable d. Comma |
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Answer» c. Communicable |
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| 27. |
The formation spindle fibres in the process of cell division is prevented by a. Corchicine b. ATP c. Hydrazine d. All of these |
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Answer» c. Hydrazine |
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| 28. |
A mutation causing a substitution of one amino acid is called a. Point mutation b. Silent mutation c. Missence mutation d. None of these |
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Answer» c. Missence mutation |
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| 29. |
Which of these is a trace element for bacteria? a. Mg+2 b. Na+ c. Ca+2 d. Mn+2 |
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Answer» Na+ is a trace element for bacteria. |
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| 30. |
A cell becomes flaccid when placed in a a. Isotonic solution b. Hypertonic solution c. Hypotonic solution d. Normal solution |
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Answer» A cell becomes flaccid when placed in a Hypertonic solution. |
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| 31. |
The prote inaceous compound are converted to ammonia by a. Putrification bacteriab. Ammonifiaction bacteria c. Nitrification bacteria d. Denitrifying bacteria |
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Answer» b. Ammonifiaction bacteria |
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| 32. |
Cell cycle regulated by a. Cyclins b. Cdks c. Cyclins and Cd ksd. None of these |
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Answer» c. Cyclins and Cd ks |
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| 33. |
Virulent factor in pneumococcus is a. Cell wall b. Capsule c. Mesosomes d. Emdotoxins |
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Answer» d. Emdotoxins |
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| 34. |
Most bacteria require vitamins as a. Growth Factors b. Sources of energy c. Sources of carbon d. Sources of electron donars |
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Answer» a. Growth Factors |
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| 35. |
The primary mode of transmission of poliomyelitis is a. Oral route b. Blood c. Milk d. Person to person |
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Answer» The primary mode of transmission of poliomyelitis is Milk. |
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| 36. |
Ergot disease is caused by a. Puccinia b. Rhizopus c. Claveceps d. Penicillium |
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Answer» c. Claveceps |
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| 37. |
Cerebral malaria is caused by a. Plasmodium vivox b. P.ovale c. P.falsiparum d. P.malaria |
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Answer» c. P.falsiparum |
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| 38. |
Co-ordination is (A) Voluntary (B) Necessary (C) Unnecessary (D) Wastage of time |
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Answer» (B) Necessary |
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| 39. |
The appearance of recombination nodules on chromosomes meiosis homologous during characterizes:(1) Bivalent(2) Sites at which crossing over occurs(3) Terminalization(4) Synaptonemal complex |
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Answer» Correct option is (2) Sites at which crossing over occurs |
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| 40. |
Regarding Meiosis, which of the statements is incorrect?(1) DNA replication occurs in S phase of Meiosis-II (2) Pairing of homologous chromosomes and recombination occurs in Meiosis-I(3) Four haploid cells are formed at the end of Meiosis-II(4) There are two stages in Meiosis, Meiosis-I and II |
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Answer» (1) DNA replication occurs in S phase of Meiosis-II |
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| 41. |
Identify the incorrect statement related to Pollination:(1) Pollination by wind is more common amongst abiotic pollination(2) Flowers produce foul odours to attract flies and beetles to get pollinated(3) Moths and butterflies are the most dominant pollinating agents among insects(4) Pollination by water is quite rare in flowering plants |
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Answer» Correct option is (3) Moths and butterflies are the most dominant pollinating agents among insects |
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| 42. |
Select the incorrect statement regarding synapses:(1) Electrical current can flow directly from one neuron into the other across the electrical synapse.(2) Chemical synapses use neurotransmitters(3) Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.(4) The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse. |
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Answer» (3) Impulse transmission across a chemical synapse is always faster than that across an electrical synapse. option 3 is incorrect.. because electrical synapses is always faster than chemical.. |
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| 43. |
Which one of the following statement is not true regarding gel electrophoresis technique?(1) The separated DNA fragments are stained by using ethidium bromide.(2) The presence of chromogenic substrate gives blue coloured DNA bands on the gel.(3) Bright orange coloured bands of DNA can be observed in the gel when exposed to UV light.(4) The process of extraction of separated DNA strands from gel is called elution. |
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Answer» (2) The presence of chromogenic substrate gives blue coloured DNA bands on the gel. |
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| 44. |
Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants:(1) Gibberellin(2) Ethylene(3) Cytokinin(4) ABA |
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Answer» Correct option is (2) Ethylene |
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| 45. |
Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for:(1) Competition(2) Biodiversity loss(3) Natality(4) Population explosion |
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Answer» Correct option is (2) Biodiversity loss |
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| 46. |
Lyme disease is caused by a. Bacteria b. Fungi c. Spirochaete d. Virus |
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Answer» Lyme disease is caused by Spirochaete. |
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| 47. |
Match the following terms with their respective effects A to E:1. Brucella melitensisA. Causes trachoma, conjunctivitis and nongonococcal gamets2. Flavobacterium species B. Causes influenza like fever3. Chlamydia trachomatis C. Causes Malta fever in goats4. Leptospira icterohaemorrhagiaeD. Contaminates pharmaceutical productsE. Weil’s disease (jaundice) |
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Answer» 1.c,2.b,3.a,4.e |
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| 48. |
Match the following aggresins with their respective modes of action from A to E: 1. HyaluronidaseA. Destroys RBC’s and other tissues2. Haemolysis B. Breaks down connective tissues, increases permeability of tissue space3. StreptokinaseC. Causes lysis of RBC’s and other tissues4. LecithinaseD. Digest the fibrin of bloodE. Dissolves collagen |
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Answer» 1.b, 2.a, 3.d, 4.c |
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| 49. |
Match the following antibiotics with respective strains A to E used for their production : 1. TetracyclinA. Streptomyces erythreus2. ChloramphenicolB. Streptomyces garyphalous3. ErythromycinC. Streptomyces niveus 4. Cycloserine D. Streptomyces viridifaciens E. Streptomyces venezuelae |
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Answer» 1.d, 2.e, 3.a, 4.b |
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| 50. |
Geraman measles is also known asa. Rubella / 2-day measles b. Rubella / 3-day measles c. Rubella / 4-day measles d. Rubella / 1-day measles |
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Answer» b. Rubella / 3-day measles |
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