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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
Electron gain enthalpy is greater than zero forA. `Na`B. `Mg`C. `A1`D. `Sn` |
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Answer» Correct Answer - B The outermost shell electron configuration of the alkaline earth metals is `ns^(@)`. For the process `M(g) +e^(-)rarr M^(-)(g)` where `M` denotes a member of group `2` family, the extra electron must enter the `np` subshell, which is effectively shielded by the two `ns` electron (the `np` electrons are farther away from the nucleus than the `ns` eletrons) and the inner electrons. consequently, alkaline earth metals such as `Mg` have no natural tendecy to pick up an extra electrons as they from unstable anions. An atom that forms an ustable anion on addition of an eletron has a positive value of `Delta_(eg)H`. |
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| 902. |
Which of the following pairs of elements have similar atpmic radii?A. `P, S`B. `As, Se`C. `N, O`D. `Sb, Te` |
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Answer» Correct Answer - C Though one expects `O` to be smaller than `N`, but in case of `O`, the interelectronic repulsion outweights the effect of increased nuclear charge and hence, both `N` and `O` have similar convalent radii. The effect of interelectronic repulsions dies out on moving down the group due to increased nuclear charge. |
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| 903. |
Which one of the following sets of ions represents the collection of isoelectronic species?A. `Na^(+), Mg^(2+), A1^(3+), C1^(-)`B. `K^(+),Ca^(2+), Sc^(3+), C1^(-)`C. `Na^(+), Ca^(2+), Sc^(3+), F^(-)`D. `K^(+), C1^(-), Mg^(2+), Sc^(3+)` |
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Answer» Correct Answer - B Isolectronic species are characterized by identical electronic configuration. `K^(+),Ca^(2+),Sc^(3+)`, and `C1^(-)`, all have the same electron configuration: `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)` |
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| 904. |
In which one of the following pairs is the radius of the second species greater than that of the first?A. `Na, Mg`B. `Ba^(2+), Sr^(2+)`C. `O^(2-), N^(3-)`D. `Li^(+),Be^(2+)` |
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Answer» Correct Answer - C Both `O^(2-)`and `N^(3-)`are isoelectronic. For such species, size increases with increase of negative charge. Moreover the nuclear charge of `N^(3-)` is less than that of `O^(2-)`. |
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| 905. |
Which has the largest first ionisation energy ?A. `Na`B. `K`C. `Rb`D. `Li` |
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Answer» Correct Answer - D `IE_(1)` dereases down the group `1` elements. So `IE_(1)` of `Li` is high in group `1` elements. |
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| 906. |
Which one of the following elements has the highest ionisation energy?A. `[Ne] 3s^(2)3p^(1)`B. `[Ne]3s^(2)3p^(3)`C. `[Ne]3s^(2)3p^(2)`D. `[Ar] 3d^(10) 4s^(2) 4p^(2)` |
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Answer» Correct Answer - B Half - filled orbitals have stable configuration and thus required high `IE`. |
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| 907. |
Which one of the following statements is incorrect in relation to ionisation enthalpy?A. Ionisation enthalpy increases for each successive electron.B. The greatest increase in ionisation enthalpy is experienced on removal of electron from core noble gas configuration.C. End of valence electrons is marked by a big jump in ionisation enthalpy.D. Removal of electron from orbitals bearing lower `n` value is easier than from orbitals having higher than `n` value. |
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Answer» Correct Answer - D As the value of n increases, the nuclear attraction over the outermost shell decreases, therefore removal of an electron will be easier. |
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| 908. |
Lather Meyer drew a graph showing the relation between atomic `"_____"` and atomic `"____"` . |
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Answer» Correct Answer - Mass, volume Mass, volume |
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| 909. |
Which of the following relation is/are correct?A. Covalent character `prop` Pseudo inert configurationB. Ionic character `prop` Inert configurationC. Covalent character `prop (1)/("Dipole moment")`D. Ionic character `prop (1)/("Dipole moment")` |
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Answer» Correct Answer - A::B::C a. Pseudo inert gas configuration has more `Z_("eff")`. b. A stable ion must have inert gas configuration. c. Covalent is inversely proportional to dipole moment. d. Ionic character is directly proportional to dipole moment. |
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| 910. |
Which of the following are correct?A. `As^(5+)` salts are better oxidising agentsB. `Tl^(3+)` salts are better oxidising agentsC. `Ga^(o+)` salts are better oxidising agentsD. `Pb^(4+)` salts are better oxidising agents |
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Answer» Correct Answer - B::C::D a. `As^(5+)` is stable, but `Sb^(3+)` `Bi^(3+)` are more stable than `+5 OS`. b. Due to inert pair effect, `Ti^(o+)` (reduction acts as oxidising agent) Hence, `Ti^(3+)` acts as oxidising agent. c. For the same reason `Ga^(3+)` is more stable than `Ga^(o+)`. d. `Pb^(2+)` is more stable than `Pb^(4+)`, due to inert pair effect. So, `Pb^(4+)` salts are better oxidising agents. |
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| 911. |
Beryllium and aluminimum exhibit many properties which are similar . But, the two elements differ inA. Forming covalent halidesB. Forming covalent hydridesC. Exhibiting maximum covalency in compoundsD. Exhibiting amphoteric nature in their oxides |
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Answer» Correct Answer - C Both `Be` and `Al` show different maximum covalency in compounds. Maximum covalency of `Be = 4` (due to absence of d-orbitals). Maximum covalency of `Al = 6` (due to presence of d-orbitals). |
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| 912. |
Morels and truffles are groups of fungi classified underA. PhycomycetesB. DeuteromycetesC. BasidiomycetesD. Ascomycetes |
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Answer» Correct Answer - D Morels and Buffles (now truffles) group of fungi are classified under ascomyctes. |
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| 913. |
Mathc the column I with column II and select the correct option from the given codes. `{:("Column I","Column II"),("Edible delicacies",(i)"Sac fungi"),("Ascomycetes",(ii)"Algal fungi"),("Basidiomycetes",(iii)"Fungi imperfecti"),("Duteromycetes",(iv)"Club fungi"):}`A. ii,i,iv,iiiB. ii,iv,i,iiiC. iv,i,ii,iiiD. iv,iii,ii,i |
| Answer» Correct Answer - A | |
| 914. |
Can we cultivate edible mushrooms at home? |
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Answer» Yes, you can cultivate edible button mushrooms (Agaricus bisporus) at home provided you have enough space, facilities and skill. Mushrooms cultivation is a complex process which completes in there phases - (i) Obtaining the Spawn, (ii) Composting and (iii) Growing of fruiting bodies. (i) Obtaining the spawn : Get the spawn (or seeds) of edible mushrooms from recognised mushrooms growers or obtain spawn bottle from a laboratory or commercial centre. (ii) Composting : Mix cow dung manure and wheat straw in the ratio of 3 : 1. Soak with water and keep the mixture in wet condition for few weeks. Add a small amount of gypsum. (iii) Growing of fruiting bodies : Fill the thoroughly composted mixture of cow dung and wheat straw in the beds or wooden trays. Pasteurize it by slowly raising its temperature upto `130- 140^(@)F` and maintain this temperature for 24-48 hours. Cool down the temperature of mixture to `75 - 80^(@)F`. Now mix the spawn and keep the trays at a temperature of `75^(@)F` and `80-90%` humidity for about three weeks. Button shaped fruiting bodies of mushroom will crop up in three weeks time and will continue to appear for about five to six weeks. |
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| 915. |
The guts of cow and buffalo possessA. MethanogensB. CyanobacteriaC. Fucus spp.D. Chlorella spp. |
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Answer» Correct Answer - A The guts of cow and buffalo possess Methanogens. |
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| 916. |
What are viroids? |
| Answer» Viroids are infectious agents comprising of small single stranded molecule of RNA. | |
| 917. |
Viroids haveA. single stranded RNA not enclosed by protein coatB. single stranded DNA not enclosed by protein coatC. double stranded DNA enclosed by protein coatD. double stranded RNA enclosed by protein coat |
| Answer» Correct Answer - A | |
| 918. |
How can you differentiate between exonucleases and endo nucleases ? |
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Answer»
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| 919. |
What is E CORI ? How does it function ? |
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Answer» E CORI is a restriction enzyme obtained from Escherichia coli. Escherichia coli. It specifically recognises GAA sites on the DNA and cuts it between G and A. |
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| 920. |
Give one example for each of transgenic plants which are suitable for food processing and those with improved nutritional quality. |
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Answer» 'Flavr Savr'- tomato, Golden Rice from Taipei is rich in vitamin A and prevent blindness. |
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| 921. |
Why has the Indian Parliament cleared the second amendment of the country's patents bill ? |
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Answer» It takes some issues into consideration, Including patent terms, Emergency provisions and research and development initiatives. |
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| 922. |
Acidity of pentoxides in `VA` groupA. DecreasesB. IncreasesC. Remains sameD. None |
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Answer» Correct Answer - A Basic or metallic character of pentaoxides in `VA` group increases down the group. Hence acidity decreases. |
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| 923. |
Distinguish between (a) Plant viruses and animal viruses on the basis of genetic material. (b) Plant viruses and bacteriophages on the basis of genetic material (c) Plant viruses and animal viruses on the basis of the symptoms of diseases caused by them. |
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Answer» (a) Plant viruses have single stranded RNA whereas animal viruses have either single or double stranded RNA or double stranded DNA. (b) Plant viruses have single stranded RNA whereas bacteriophages have double stranded DNA. (c) Animal viruses cause diseases like mumps, small pox, herpes, influenza and AIDS whereas plant viruses cause mosaic, mottling, leaf roll, leaf curl, chlorosis and dwarfing in plants. |
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| 924. |
(a) Name an organism that is made up two components which live together in symbiotic association. Also name the two components. (b) Give the function of each component. (c) What is their ecological significance ? |
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Answer» (a) The organism is Lichen. Lichen thalli are made of two components - phycobiont and mycobiont which live in symbiotic association. (b) The plycobiont prepares food and the mycobiont provides shelter, absorbs minerals and water for its partner. (c) The lichens are very good pollution indicators. |
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| 925. |
Write the colour code of a carbon resistor of resistance 23 kilo ohms. |
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Answer» Color code of a carbon resistor of 23 Kilo Ohms (= 23 × 103Ω) are Red, Orange, Orange [∵ Sequence number 2 for Red, 3 for orange, multiplication factor 103 for orange] |
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| 926. |
Define systematics. |
| Answer» Arrangement of organisms into an appropriate system. | |
| 927. |
The diagram shows the structure of a fungal cell with different parts labelled as A,B,C and D. Which of the following statements are true with regard to the fungal cell structive? (i) A contains mucopolysaccharides which are also present in exoskeleton of insects and crustaceans. (ii) D are usually more than one in number in case of aseptate hyphae. (iii) Carotenes and xanthophylls are present in C, which harvest light energy for photosynthesis. (iv) B is the reverse food material, usually stored in the form of starch and oil.A. i and iiB. iii and ivC. i,ii and ivD. ii,iii and iv |
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Answer» Correct Answer - A In the given structure of fungal cell, A is the cell wall.Fungal cell wall contains chitin along with other polysaccharides, proteins, etc. Chitin is a mucopolysaccharide and is also present in exoskeleton of insects and arthropods.In fungi, the reserve food material is present in the form of glycogen (shown by B) and oils.C represents mitochondrion.Fungi are achlorophyllous organisms and lack chloroplasts and photosynthetic pigments D represents nucleus.Septate hyphae may be uni-or multi-nucleate and aseptate hyphae are usually multinucleate (= coenocytic). |
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| 928. |
Name the group of fungi which is commonly called the sac fungi. |
| Answer» Correct Answer - Ascomycetes. | |
| 929. |
Give one example each of Amoeboid protozoans, Ciliated protozoans and sporozoans. Which one of them causes malaria in human beings ? |
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Answer» Amoeboid protozoan : Amoeba Flagellated protozoan : Trypanosoma Ciliated protozoan : Paramoecium Sporozoan : Plasmodium Plasmodium is called malarial parasite and causes malaria in human beings. |
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| 930. |
Which of the following are called acellular organisms ?A. Viruses and viroidsB. Viroids and lichensC. Lichens and virusesD. Viruses, viroids and lichens |
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Answer» Correct Answer - A Viruses and viroids are called acellular organisms. |
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| 931. |
In which of the following options, all the members do not belong to same class.A. Bread mould, Mucor, Parasitic fungi on MustardB. Claviceps, Neurospora, Aspergillus, morels,truffles and puffballsC. Rust, smut, mushrooms, bracket fungiD. Colletotrichum, Alternaria and Trichoderma |
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Answer» Correct Answer - B Claviceps, Neurospora, Aspergillus, morels, truffles-Ascomycetes, Puff balls-Basidiomycetes |
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| 932. |
One basic difference between bacteria and archaebacteria has led the latter to survive under extreme conditions. What is that difference ? |
| Answer» Archaebacteria differ from other bacteria in having a different cell wall structure. | |
| 933. |
Asseration : Archaebacteria are able to survive in harsh habitats. Reason : Presence of peptidogly cen in wall help archaebacteria to survive in extreme conditions.A. If both assertion and reason and true and reason is the correct explanation of assertion.B. If both assertion and reason and true and reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - C Archaebacteria are special since they live in some of the most harsh habitats such as extreme salty areas (halophiles), hot springs (thermoacidphiles) and marshy bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions. Archaebacteria are characterised by absence of peptidoglycan in their cell walls. Instead cell wall contains protein and non cellulosic polysaccharide. |
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| 934. |
Asseration : Methanogens are present in the gut of several ruminant animals. Reason : Methanogens help in the production of methane from dung of ruminants.A. If both assertion and reason and true and reason is the correct explanation of assertion.B. If both assertion and reason and true and reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - B Methanogens occur in marshy areas where they converts formic acid and carbon dioxide into methane with the help of hydrogen. Some of hte methanogen archaebacteria live as symbionts (e.g. Methanobacterium) inside rumen or first chamber in the stomach of herbivorous animals that chew their cud (ruminants, e.g. cow, buffalo) and they help in production of methane from dung of these animals. These archaebacteria are helpful to the ruminants in fermentation of cellulose. |
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| 935. |
The heterotrophic mode of nutrition is found inA. MoneraB. FungiC. AnimaliaD. All of the above |
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Answer» Correct Answer - D The heterotrophic mode of nutrition is found in Monera, Fungi and Animalia. |
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| 936. |
Viruses cause several diseases in plants and animals. In plants, the symptoms can beA. Mosaic formation, dwarfing and stunted growthB. Leaf rolling and curlingC. Yellowing and vein clearingD. All of the above |
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Answer» Correct Answer - D Viruses cause several diseases in plants and animals. In plants, the symptom can be mosaic formation, dwarfing, stunted growth, leaf rolling and curling and yellowing and vein clearing. |
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| 937. |
In fungi, heterotrophic nutrition may beA. SymbioticB. ParasiticC. SaprophyticD. All of the above |
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Answer» Correct Answer - D In fungi, heterotrophic nutrition may be Symbiotic, Parasitic or Saprophytic. |
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| 938. |
Viruses that cause infections in plants do not haveA. ss RNAB. ds RNAC. ds DNAD. ss DNA |
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Answer» Correct Answer - D Vixuses that cuases infection in plants do not have ssDNA. |
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| 939. |
A dikaryon is formed whenA. meiosis is arrestedB. the two haploid cells do not fuse immediatelyC. cytoplasm does not fuseD. None of the above |
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Answer» Correct Answer - B Dikaryon is a cell containing two nucleus. This results when two somatic cells fuse but their nucleus does not fuse immediately. Meiosis does not result in such conditions. |
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| 940. |
A dikaryon is formed whenA. meiosis is arrestedB. the two haploid cells do not fuse immediatelyC. cytoplasm does not fuseD. none of above. |
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Answer» Correct Answer - D Dikaryon is a stage/phase of a cell, in which, there are two nuclei.This condition arises, if fusion of cytoplasm (plasmogamy) is not immediately followed by fusion of nuclei (karyogamy), i.e., there is a delay between them.Such cells are called dikaryotic cells.This condition is found in higher fungi where karyogamy is delayed (with respect to plasmogamy) and is called dikaryophase. |
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| 941. |
Contagium vivum fluidum was proposed byA. D.J. IvanowskyB. M.W. BeijerinekC. StanleyD. Robert Hook |
| Answer» Correct Answer - B | |
| 942. |
Write a short note on lymph. |
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Answer» Lymph : Lymph is a colourless fluid. It lacks RBC, platelets and large plasma proteins, but has more number of leucocytes. It is chiefly composed of plasma and lymphocytes. When compared to the tissue fluid, it contains very small amounts of nutrients and oxygen, but has abundant CO2 and other metabolites. The most important site of formation of lymph is interstitial space. As blood passes through the blood capillaries, some portion of blood that includes water, solutes and proteins of low molecular weight passes through the walls of capillaries, into the interstitial spaces due to hydrostatic pressure at the arteriolar ends. This fluid forms the interstitial fluid (tissue fluid). Most of the interstitial fluid is returned directly to the capillaries due to osmotic pressure at the venular ends. Little amount of this tissue fluid passes through a system of lymphatic capillaries (lymph capillaries of the intestinal villi are called 'lacteals'), vessels, ducts and finally reach the blood through the subclavian veins. The extracellular 'tissue fluid' that passes into the lymph capillaries and lymph vessels is called 'lymph'. Lymphatic system represents an 'accessory route' by which interstitial fluid flows from tissue spaces into blood. |
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| 943. |
What are the salient features of the echinoids ? |
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Answer» (1) It includes sea urchins, heart urchins, sand dollars etc. The body is avoid or discoidal and covered by movable spines. (2) Arms are absent, tube feet are arranged in five bands and bear suckers. (3) Ossicles of the body unity to form a rigid test or corona or case. (4) Pedicellaria are "three jawed". (5) Anus and madreporite are aboral in position. (6) Ambulacral grooves are closed. (7) A complex five jawed masticatory apparatus called Aristotle's lantern is present just inside the mouth. It is absent in heart urchins. (8) Life history includes larval form called echinopluteus. (9) Specialized gills called peristomial gills occurs in sea urchins. Eg: Salmacis (sea urchins), Echino cardium (heart orchins) clypeastoer (cake urchins). |
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| 944. |
What are the modifications that are observed in birds that help them in flight ? |
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Answer» So many modifications are observed in birds that help them in flight. (1) Exo and endo skeletons and body structure features might have contributed for their successful arieal mode of life. (2) Exoskeleton consists of epidermal feathers. Feathers are unique to birds. They are useful for flight, particularly the Quill feathers help in flight. (3) Body is boat-shaped and streamlined. (4) Fourlimbs are modified into wings. (5) Many bones are neumatic with extensions of air sacs. (6) All modern flying birds are provided with powerfull breast muscles (flight muscles) chiefly the pectoralis major and pectoralis minor. (7) Lungs are associated with air scas. |
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| 945. |
Spliceosomes are not found in cell ofA. fungiB. animalsC. bacteriaD. Plants |
| Answer» Correct Answer - C | |
| 946. |
Which among the following is not a prokaryoteA. SaccharomycesB. MycobacteriumC. NostocD. Oscillatoria |
| Answer» Correct Answer - A | |
| 947. |
Assertion: The ionic size of `O^(2-)` is bigger than that of `F^(-)` ions. Reason: `O^(2-)` and `F^(-)` are isoelectronic ions.A. If both assertion and reason are true and reason is the correct explanation of assertionB. If the assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - B Correct explanation `O^(2-)` has higer negative charge than `F^(-)` . |
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| 948. |
Which one of the following sets of ions represents the collection of isoelectronic species?A. `K^(+),Cl^(-),Mg^(2+),Sc^(3+)`B. `K^(+),Ca^(2+),Sc^(3+),Cl^(-)`C. `Na^(+),Ca^(2+),Sc^(3+),F`D. `Na^(+),Mg^(2+),Al^(3+),Cl` |
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Answer» Correct Answer - C Isoelectronic species are those which have same electrons. `K^(+)=19-1=18, Ca^(+2)=20-2=18` `Sc^(+3)=121-3=18, Cl^(-)=17+1=18` |
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| 949. |
Chloride ion and potassium ion are isoelectronic. ThenA. Potassium ion is relatively biggerB. Depends on the other cation and anionC. Their size are sameD. Chloride ion is bigger than potassium ion |
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Answer» Correct Answer - D Chloride ion and potassium ion are isoelectonic isoelectronic ions are those ions having same number of electrons . `K=2,8,8,1" " K^(+)=2,8,8` `Cl=2,8,7" " Cl^(-) = 2,8,8`. |
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| 950. |
Which of ions are isoelectronic?A. `Be^(2+), Mg^(2+), Al^(3+)`B. `Al^(3+), Ca^(2+), Sr^(2+)`C. `Ca^(2+), K^(+), S^(2-)`D. `K^(+), Na^(+), Li^(+)` |
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Answer» Correct Answer - C `K^(+),S^(2-),Ca^(2+)` all are isoelectronic with 18 electrons. |
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