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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. |
In `triangle ABC` , with the usual notations , prove that `2{a sin^(2).(C)/(2)+csin^2.(A)/(2)}=a+c-b` |
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Answer» L.H.S.= `2{asin^(2).(C)/(2)+csin^(2).(A)/(2)}` `=a{2sin^(2).(C)/(2)}+c{2sin^(2).(A)/(2)}` `=a(1-cos C)+c(1-cosA)` `=a[1-(a^(2)+b^(2)-c^(2))/(2ab)]+c[1-(b^(2)+c^(2)-a^(2))/(2bc)]` `=a[(2ab-a^(@)-b^(2)+c^(2))/(2ab)]+c[(2bc-b^(2)-c^(2)+a^(2))/(2bc)]` `=(2ab-a^(2)-b^(2)+c^(2)+2ab-b^(2)-c^(2)+a^(2))/(2b)` `=(2ab+2bc-2b^(2))/(2b)` `=(2b(a+c-b))/(2b)=a+c-b=R.H.S.` |
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| 2. |
Classify the following ligands into monodentate and polydentate : (a) Ammonia (b ) Carbon monoxide (c ) Ethylene diamine (d ) Ethylene diamine tetra 0 acetate ion |
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Answer» Monodentate ligands are : Ammonia Carbon monoxide Polydenatate ligands are : Ethylene diamine Ethylene diamine tetra - acetate ion. |
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| 3. |
Write four characteristics of co - ordinate complex ions. |
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Answer» The four characteristics of the co- ordinate complex ions are : (a) The complex ion has different characterstic properties than metal ions or ligands . For example , the properties of ` [ Cu (NH_(3))_(4)]^(2+)` are different than `CU^(2+)` ions or `NH_(3)` molecules . (b ) Complex ions retain identify in the solution , through they dissociate to a very small extent . (c) The net charge of a complex ion is equal to algebraic sum of the change on the central metal ion and on ligands . (d) A chelate complex formed by polydentate ligands is more stable than the non - chelate complex , For example , ` [ Zn(en)_(2)]^(2+)` is more stable than ` [ Zn (NH_(3))_(6)^(2+)]` |
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| 4. |
Write any two uses of terylene. |
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Answer» The two uses of Terylene are : (a) Terylene is used for shaping the sails of boats These sails are light strong and do not get streched and rot in the contact of water . (b ) Aprons and other protecting clothings of terylene are used in industries and laboratories . These are resistant to action of chemical stc . The four physical methods for the preservation food ,aterials are : |
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| 5. |
Explain physical methods for preservation of food. |
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Answer» (i) By removal of heat (By cooling) : Refrigeration, freezing preservation, dehydrofreezing , preservation or carbonation such processes are involved in this method . Cooling leads to lowering of temperature which prevents the growth of micro - organisms Example : Fresh fruit , vegetables are preserved by this method . (ii) By addition of heat : It involves methods like pasteurization or sterilization , it also called as camnning or heat processing . By this method solid liquid foods are preserved on a large scale , as heating kills the microorganisms . Example : Milk is pasteurized for its preservation . (iii) By removal of water (Dehydration ) : In this method , water is removed by sun - drying , low temperature evaporation , freeze drying or puff drying . The growth of micro - organisms is prohibited as all the water is removed . Example : Various vegetables , fruit and foodgrains are preserved by this method (iv) By irradiation : UV or ionzing radiation is used to preserve food . The irradiation controls the growth of microorganisms . High energy eletro magnetic radiation produces desired effects without inducing radioactivity in food . Example : Bakery products are preserved by irradiation . |
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| 6. |
Describe the cross between a homozygous tall round- seeded pea plant and a dwarf, wrinkled-seeded pea plant. What will be the types of progeny in the `F_(2)` generation of this cross and in what proportion will it be? Name and state the law which is explained by this example. |
| Answer» The law explained by this example is known as Law of Independent Assortment. | |
| 7. |
It is paradoxical that ___________ average consumer cannot decide which technology will offer him _______ highest standards of water purification [ Fill in the blanks with appropriate articles.] |
| Answer» (i) It is paradoxical that an average consumer cannot decide which technology will after him the highest standards at water purification. | |
| 8. |
Gemmule formation takes place in ..............A. HydraB. SpongillaC. PlanariaD. Human being |
| Answer» Correct Answer - D | |
| 9. |
I tramped back to the farm , drenched ,shamed furious and picked the soggy bundle from the ash can . I dried it in the kitchen oven .Then I flung it on the table and set to work again with a kind of frantic desperation .I lost myself in the ferociousness of my purpose I would not be beaten , I would not given in . I wrote harder than ever . At least ,towards the end to the third month , I wrote finish. The relief, the sense of emancipation ,was unbelievable . I had kept my word .I had created a book . Whether it was good ,bad or indifferent I did not care. I chose a publisher by the simple expedient of closing my eyes and pricking a catalogue with a pin . I s dispatched the completed manuscript and promptly forgot about it. In the days which followed I gradually regained my health ,and I began to chafe at idleness .I wanted to be back in harness. At last the date of my deliverance drew near . I went around the village saying good -bye to the simple folk who had become my friends .As I entered the post office ,the post master presented me with a tetegram - an urgent invitation to meet the publisher . I took it straight away and showed it , without a word ,to John Angus. The novel I had thrown away was chosen by the Book Society ,dramatized and serialized ,translated into 19 languages, bought by Hollywood .It has sold millions of copies. Rewrite the following sentences in the ways instructed: (i) I flung it on the table and set to work asgain .(Make it a simple sentence) (ii) I had created a book. (Rewrite it using the Present Perfect Continuous tense) (iii) I went around the village saying good -bye to my friends. (Rewrite it using the infinitive form of the underlined word.) |
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Answer» (i) Flinging it on the table, I started working again. (ii) I have been creating a book. (iii) I went around the village to say good - bye to my friends. |
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| 10. |
How much electricity in terms of Faraday is required to produce. `a.` `20.0g` fo `Ca` from molten `CaCl_(2)` `b.` `40g` of `Al` from molten `Al_(2)O_(3)` |
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Answer» (a) `Ca^(2+)+2e^(-) to Ca` , 1 mol Ca is produced from 2 mole or 40 g Ca is produced from 2 F . ` :. ` 20 g of Ca is produced from 1 F of electricity . Thus , 1 faraday of electricity will be required to produce `20*0` g of Ca from molten `CaCl_(2)` . ,brgt (b) `al^(3+)+3e^(-) to Al` 27 g Al is produced from 3 F ` :. " 20 g of Al requires " = 3/27 xx 40 = 4 * 44 ` F `4*44 ` F of electricity . Hence, `4*44` faraday of electricity will be required to produced `40*0` g Al from molten `Al_(2)O_(3)` |
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