100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	Arrange the following in correct order of their basic strength (I) \( OH ^{-} \) (II) \( CH _{3} COO ^{-} \) (III) \( Cl ^{-} \) a) \( III > Il > I \) b) \( I > II > III \) c) \( I > III > II \) d) \( I I>I I I>I \)
Answer» Correct option is (b) CH₃COO^- As we know that stronger the base, weaker the its conjugate acid. The conjugate acids \(\bar O\)H \(\longrightarrow\) H₂O CH₃COO^-\(\longrightarrow\) CH₃COOH Cl^- \(\longrightarrow\) Hcl As we know , HCl is stronger acid than H₂O and CH₃COOH,. CH₃COOH is stronger acid than H₂O Therefore the order of basic strength of \(\bar O\)H, CH₃COO^-and Cl^-will be \(\bar O\)H > CH₃COO^- > Cl^-

1.

Arrange the following in correct order of their basic strength (I) \( OH ^{-} \) (II) \( CH _{3} COO ^{-} \) (III) \( Cl ^{-} \) a) \( III > Il > I \) b) \( I > II > III \) c) \( I > III > II \) d) \( I I>I I I>I \)

Answer»

Correct option is (b) CH₃COO^-

As we know that stronger the base, weaker the its conjugate acid.

The conjugate acids

\(\bar O\)H \(\longrightarrow\) H₂O

CH₃COO^-\(\longrightarrow\) CH₃COOH

Cl^- \(\longrightarrow\) Hcl

As we know , HCl is stronger acid than H₂O and CH₃COOH,. CH₃COOH is stronger acid than H₂O

Therefore the order of basic strength of \(\bar O\)H, CH₃COO^-and Cl^-will be

\(\bar O\)H > CH₃COO^- > Cl^-

Discussion

2.	Arrange the following in their nucleophilicity order :A. C6H5O- B. C6H5S- C. C6H5C-H2 D. CH3COC-H21. B>C>D>A. 2. A>D>B>C3. B>D>C>A. 4. C>D>A>B
Answer» Ans.3।।।।।।।।।।।It due to surrounding by solvent molecules to the electron rich species which makes it less mobile to reach the electrophile and and imparts steric hinderance

Discussion

3.	19. Arrange the following in correct order of their basic strength(I) \( OH ^{-} \)(II) \( CH _{3} COO ^{-} \)(III) \( Cl ^{-} \)a) \( III > Il > I \)b) \( I > II > III \)c) \( I > III > II \)d) \( I I>I I I>I \)
Answer» ans would be B here according to conjugate acid base concept, conjugate base of strongest acid will be the weakest base.

Discussion

4.	The chemical that initiates electrolysis in Halls process isA. `Na_(3)AlF_(6)`B. `Al_(2)O_(3)`C. `Al(OH)_(3)`D. `AlF_(3)`
Answer» Correct Answer - A `Na_(3) AlF_(6) hArr 2NaF+AlF_(3) ` and `AlF_(3) hArr Al^(3+) + 3F^(-)` `Al_(2)O_(3) + 6F_(2) to 4AlF_(3)+……………….`

Discussion

5.	Write an application to the D.S.O. to issue a permit for 75 kg. sugar for the marriage of your sister.OrWrite an application to the District Supply Officer of your district requesting him to grant you a permit for ten litres of kerosene oil which will help you in your study as there is frequent powercut in your area.
Answer» TO, THE DISTRICT SUPPLY OFFICER, Bareilly. Sir, Most respectfully, it is stated that I need 75 kg. of sugar for the marriage of my sister to be performed on May 12th, 20……. I, therefore, request you to issue me a permit for 75 kg. sugar and oblige. Thanking you. Yours faithfully, ABC Dated : May I st, 20….. Address ……………..

5.

Write an application to the D.S.O. to issue a permit for 75 kg. sugar for the marriage of your sister.OrWrite an application to the District Supply Officer of your district requesting him to grant you a permit for ten litres of kerosene oil which will help you in your study as there is frequent powercut in your area.

Answer»

TO,
THE DISTRICT SUPPLY OFFICER,
Bareilly.

Sir,

Most respectfully, it is stated that I need 75 kg. of sugar for the marriage of my sister to be performed on May 12th, 20……. I, therefore, request you to issue me a permit for 75 kg. sugar and oblige. Thanking you.

Yours faithfully,
ABC

Dated : May I st, 20…..
Address ……………..

Discussion

6.	Which of the following writs may be issued to enforce a Fundamental Right?(a) Habeas Corpus(b) Mandamus(c) Prohibition(d) Certiorari
Answer» Habeas Corpus may be issued to enforce a Fundamental Right.

Discussion

7.	Which of the following is not an ore of lead?A. GalenaB. CassiteriteC. AnglesiteD. Cerussite
Answer» Correct Answer - B Galena : `PbS`, Cassiterite : `SnO_(2)` Anglesite : `PbSO_(4)` , Cerussite : `PbCO_(3)`.

Discussion

8.	Flux is used to removeA. acidic impuritiesB. basic impuritiesC. all impurities form oresD. both`(a)`and`(b)
Answer» Correct Answer - D Flux is used to fuse non-fusible impurities present in ore.

Discussion

9.	Which of the following is a carbonate ore?A. PyrolusiteB. MalachiteC. DiasporeD. Cassiterite
Answer» Correct Answer - B Malachite `-CuCO_(3).Cu(OH)_(2)` Pyrolusite`-MnO` Diaspore`-A1_(2)O_(3).H_(2)O` Cassiterite`-SnO_(2)`

Discussion

10.	Calcination is used in matallurgy for removal ofA. water and sulphideB. water and `CO_(2)`C. `CO_(2)`and `H_(2)S`D. `H_(2)O`and `H_(2)S`
Answer» Correct Answer - B `ZnCO_(3)rarrZnO +CO_(2)` In calcination ore is heated in absence of air in a reverberatory furnace to remove mositure and `CO_(2)`.

Discussion

11.	Lepidolite is an ore ofA. KB. NaC. LiD. All of these
Answer» Correct Answer - D Lepidolite : `(Li,Na,K)_(2) , Al_(2) (SiO_(3))_(2), (F, OH)_(2)`.

Discussion

12.	How many molecules of ammonia are required to form 8 molecules of ureaA. 24B. 8C. 16D. 4
Answer» Correct Answer - C Sixteen molecules of ammonia are required to form 8 molecules of urea.

Discussion

13.	Which of the following is not an ore of IronA. MagnetiteB. HaematiteC. LimoniteD. Cuprite
Answer» Correct Answer - A Magnetite : `Fe_(3) O_(4)` , Haematite : `Fe_(2)O_(3)` Limonite : `Fe_(2)O_(3).3H_(2) O` , Cuprite : `Cu_(2) O`.

Discussion

14.	Pb and Sn are extracted from their chief ore by `:`A. Carbon reduction, self-reductionB. Self-reduction, carbon reductionC. Electrolytic reduction, cyanide processD. Cyanide process, electrolytic reduction
Answer» Correct Answer - B `PbS + 2PbO rarr 3Pb + SO_(2)` (self-reduction) `SnO + C rarr Sn + CO` (Carbon reduction).

Discussion

15.	Blood of human beings containA. FeB. MgC. CoD. Al
Answer» Correct Answer - A Haemoglobin contains `Fe`.

Discussion

16.	The substance not likely to contain `CaCO_(3)` is:A. Sea shellsB. DolomiteC. Marble statueD. Calcined gypsum
Answer» Correct Answer - D Gypsum is `CaSO_(4).2H_(2) O`.

Discussion

17.	(b) Platinum, indium etc. are known as noble metals because they are ____towards many common reagents.
Answer» Correct Answer - Inert Inert

Discussion

18.	( c) ____iron is the purest form of iron.A. SteelB. Wrought ironC. Cast ironD. Pig iron
Answer» Correct Answer - b Wrought iron is the perest of iron (and thus has highest melting point) while can is the implest form of iron and then has iron and has lower melting point carbon of steel is in between that lower of cast of pig iron and wrong ht iron .The increasing order of implarty is Winoght iron lt and lt pig iron cast iron. The molten metel obtained from the blast furnace is known as pig iron. It contains up to `4.3%` carbon and possible other impurities such as `Si,P, S` and `Mn` , The non-metallic other impurities must be removed to redcue the brittlensess. The souce of the impurities in pig iron are as follows : `C` arises from the coke used in the blast furnace `Si, P and S` originate form the reduction by `C` of silicates, phosphates or sulphates present in the ore, or from `S` in the coke. Small amounts of `Mn` are often found in iron ore, but for most purpose this is beneficial rather than harmful. Cast irons (which contain as high as `4.5%` carbon) is made by igniting a minuts of pig iron scrrap iron and coke in cuipole farance by a blast of jhot air .The remethed non is present into moduls to make article such as mathols covers gatting reachinary frames and draimpipes cast iron example slightly on solusiying and therefore farthfully reproductes the slight on the moudle ,it is extremely hard , but unifortanatelly is very bettle and will fraction if struch by a sharp blow . The imprtities in cast iron lower the melting point from `1538^(@)C` for pure iron to appoximatelly `1200^(@)C`. Wrough iron is made by heating impure iron (pig iron or cast iron) with bacamatile so that impurities are oxidired carbon is converted tyo carbon monoxide while silicon and manganece to a slag `Fe_(2)O_(3)(s) + 3C(s) rarr 2Fe(1) + 2CO(g)` `2Fe_(2)O_(3)(s) + 3Si(s) rarr 4Fe(1) + 3SiO_(2)` `Fe_(2)O_(3)(s)+3Mn(s)rarr2Fe(1)+3 MnO` ` MnO + SiO(2)tounderset(slag)(MnSiO_(3))` As the impurities are removed , the melting point of the iron rises to about `1500^(@)C` and the pasty mass is removed from the furance as balls and worked under a hammer to squezze out the slag. Wrought iron is tough mallcable , railway carriage coupling and ormamebtal gates etc wronght iron , which is ressistant to rusting and corrosion due to the presence of `MnSiO_(2)` and `FePO_(4)` slag etc wrong iron used to present partly as iron , (pig iron cast iron) is too britle for most perpose and is converted into steel by removing practically all the `S,Si and P` impurities. The carbon content of impure iron, which may be a high as `4.5%_(0)`, is reduced to between `0.1` and `2.0` percent depending on the type of steel required.

Discussion

19.	Sandstone in some iron ores is removed byA. Carbon filtersB. Compressesd airC. LimestoneD. Sulphuric acid
Answer» Correct Answer - C Limestone `(CaCO_(3))` acts as basic flux for sandstone `(SiO_(2))` and they react to form `CaSiO_(3)` and `CO_(2)` gas is evolved. `CaCO_(3) + SiO_(2) rarr CaSiO_(3) + CO_(2) uarr`.

Discussion

20.	( c) ____iron is the purest form of iron.
Answer» Correct Answer - Wrought Wrought

Discussion

21.	Which is not a silver ore ?A. ArgentiteB. SideriteC. Horn silverD. Ruby silver
Answer» Correct Answer - B Siderite : `FeCO_(3)`, Horn silver : `AgCl` Argenitite : `Ag_(2) S` , ruby silver : `3 Ag_(2) S. Sb_(2) S_(2)`.

Discussion

22.	The chemical composition of slag formed during the smelting process in the extraction of copper isA. `Cu_(2) O + FeS`B. `FeSiO_(3)`C. `CuFeS_(2)`D. `Cu_(2)S + FeO`
Answer» Correct Answer - B The none-fusible basic gangue `FeO` is removed by acidic flux `SiO_(2)` in form of slag `FeSiO_(3)`.

Discussion

23.	(d) Passivity of iron is due to the formation of thin film of ____on its surface.
Answer» Correct Answer - Oxide Oxide

Discussion

24.	Calcination of ores involves heating the ore below its fusion temperature inA. presence of superheated steamB. absence of air or limited supply of airC. an atmosphare of nirogenD. presence of air
Answer» Correct Answer - b Because metals in their combined forms always have positive oxidation number, the production of a free metal is always a reduction process, Preliminary operation may be necessery to convert the ore to a chemical state more suitable for reduction , for example ,an ore may be calcined (i.e. strongly heated in absences of air or luimited apply of air)to drive off volatile impurities and or the sametime to convert the carbonates to the corresponding oxide, which can be reduced more conveminaly to yied the pure metals `CaCO_(2) (s) overset (Delta) To CaO(s) + CO_(2)(g)`

Discussion

25.	By which of the following processes is an oxide ore readuced to the free metal ?A. CalcinationB. LeachingC. SmeltingD. Roasting
Answer» Correct Answer - c The process of extracting the metal by heating the metal oxide with a suitable reducing agent is called smehing it is one of the steps involved in protonetallergy .The method used for depends on how strongly the metal ions are bonded to unitens .When the holding is string more energy is ewquired to reduces the metal.This metals reduction more exprensive to reduced the most active metals usually have the string holding . The most reactive metals `(Au, A,Pt,etc)` occure in the free state and thus requite no reduction.This is why prehistoric times. Some less active jmetals such as `Hg` .can be obtained directly from their sulphides ores by readuced metal inos to th efree metals by oxidetion of the sulphide ions `underset("Cinnabar")(HgS (s)) + underset("from air")(O_(2)(g)) overset(Delta)(to) SO_(2)(g) + underset({:("obtained as vapour"),("later condensed"):})(Hg(g))` Roasting sulphides of the more active metals produces metal oxides , but no free metals `2NS(s) + 3O_(2)(g) overset(Delta) To 2NiO(s) + 2SO_(2)(g)` The resulting metals oxide are then reducing to free metals with coke or `CO`if `C` most be arosided, amother roducting agent , such as `H_(2),F_(2) , or Al` is used `SaO_(2)(s) + 2C(s) overset (Delta) To Sa(1) + 2CO_(g)` `WO_(3)(s) + 3H_(2)(g) overset(Delta) To W(s) + 2H_(2)O(g)` THe very active metaqls such as `Al` and ` Na` are reduced electrochemically usually from their anlydrous moleten salts if `H_(2)O` is present , it is reduced of the more active metals

Discussion

26.	( e) Phenimenon of removing layers of basic oxides from metals before electroplating is called _____.
Answer» Correct Answer - Pickling Pickling

Discussion

27.	Roasting of ores is done inA. Presence of an execess of air or oxygenB. Presence of superheated steamC. Absence of airD. Presence of a limited supply of air
Answer» Correct Answer - a Once n ore is concentrated, it may be neccessry to convent the mineral to a compound more suitable the reduction. Reasting is the process of heating a comecetrated ore below its melting point in the pressence of execes of air to obtain the oxide . Sulphide minerals such as zinc ore (containing the minerals aphalterite `ZnS` are usually roasted befor reducing them to the metal). `2ZnS(s) + 3O_(2)(g) overset (heat) To 2 ZnO(s) + 2SO_(2)(g)` `Delta H = - 684 kJ mol^(-1)`

Discussion

28.	Which does not contain aluminium ?A. BauxiteB. CorundumC. DiasporeD. Dolomite
Answer» Correct Answer - D Dolomite : `CaCO_(3).MgCO_(3)`, Bauxite: `Al_(2) O_(3) .2H_(2)O`, Corundum : `Al_(2)O_(3)` , Diaspore : `Al_(2)O_(3).H_(2) O`.

Discussion

29.	The metal that cannot obtained by electrolysis of an aqueous solution of its salts is `:`A. AgB. MgC. CuD. Cr
Answer» Correct Answer - B `Mg^(2+)` ions are not discharged, rather `H^(oplus)` ions are discharged at cathode.

Discussion

30.	Ferric oxide blast furnace is reduced byA. CB. COC. `H_(2)`D. `CO_(2)`
Answer» Correct Answer - B `FeO + CO overset(1000^@ C)rarr Fe + CO_(2)`.

Discussion

31.	Electric furnaces are lined with magnesia becauseA. It melts at a very high temperatureB. It is not affected by acidsC. It has no effect of electricityD. It liberated oxygen on heating
Answer» Correct Answer - A Hence, furnace material can withstand high temperature.

Discussion

32.	Rutile is an ore ofA. TiB. MnC. CaD. Mg
Answer» Correct Answer - A Rutle is `TiO_(2)`.

Discussion

33.	Roasting of ores is done inA. moisture is removedB. non-metals as their volatile oxide are removedC. ore become porocus.D. all the above.
Answer» Correct Answer - D Roasting removes easily oxidisable volatile impurities like aresenic `(As_(2)O_(3))`, sulphur (as `SO_(2)`, phosphorus (as`P_(4)O_(10))` and antimony (as `Sb_(2)O_(3))`. `4M(M = As, Sb) +3O_(2)rarr 2M_(2)O_(3)` `S+O_(2)rarr SO_(2), P_(4) +4O_(2) rarr P_(4)O_(10)` Organic matter moisture if present in the ore, also get expelled and the ore becomes porous.

Discussion

34.

What is the key difference between primary and secondary sewage treatment?

Answer»

Primary sewage treatment	Secondary sewage treatment
It is a mechanical process involving the removal of coarse solid materials.	It is a biological process involving the action of microbes.
It is inexpensive and relatively less complicated	It is a very expensive and complicated process.

Discussion

35.	What is sewage? In which way can sewage be harmful to us?
Answer» Sewage is the municipal waste matter that is carried away in sewers and drains. It includes both liquid and solid wastes, rich in organic matter and microbes. Many of these microbes are pathogenic and can cause several water- borne diseases. Sewage water is a major cause of polluting drinking water. Hence, it is essential that sewage water is properly collected, treated, and disposed.

Discussion

36.

Name any two species of fungus, which are used in the production of the antibiotics.

Answer»

Antibiotics are medicines that are produced by certain micro-organisms to kill other disease-causing micro-organisms. These medicines are commonly obtained from bacteria and fungi.
The species of fungus used in the production of antibiotics are:

Antibiotic	Fungus source
Penicillin	Penicillium notatum
Cephalosporin	Cephalosporium acremonium

Discussion

37.	The fertilized egg or the zygote gets implanted in the (a) fallopian tube (b) ovary (c) uterus (d) vagina
Answer» (c) The fertilized egg or zygote gets implanted in the uterus after the process of fertilization. The uterus is a bag like structure that holds the embryo till the birth of the child.

Discussion

38.	The rules of heredity determine the process by which ________ and _________ are reliably inherited. (a) shape and size (b) traits and characteristics (c) Both (1) and (2) (d) Neither (1) nor (2)
Answer» (b) Reproductive processes generate individuals of similar design so, the rules of heredity determine the process by which traits and characteristics are reliably inherited.

Discussion

39.	Molecular movements are needed for life (a) for repairing and maintaining structures (b) for nutrition (c) for respiration (d) for repairing only
Answer» (a) The process of repairing and maintaining requires molecular movements in life. When there is a bleeding from the cut finger, these molecular movements not only helps to stop the bleeding but also helps in healing the wounds.

Discussion

40.	Selection of variants by environmental factors (a) forms the basis of evolutionary processes (b) forms the basis of reproduction (c) cause inheritance of traits (d) have different kind of advantages
Answer» (a) Variants by environmental factors like temperature form the basis of evolutionary processes.

Discussion

41.	The communication between CNS and other parts of the body is facilitated by (a) peripheral nervous system (b) brain (c) spinal cord (d) reflexes
Answer» (a) The peripheral nervous system is part of the nervous system, and consists of the nerves and neurons that reside or extend outside the central nervous system (the brain and spinal cord) to serve the limbs and organs, for example.

Discussion

42.	Enzymes are (a) vitamins (b) proteins (c) carbohydrates (d) fats
Answer» (b) Enzymes are proteins that catalyze chemical reactions. Almost all processes in a biological cell need enzymes in order to occur at significant rates. The set of enzymes made in a cell determines which metabolic pathways occur in that cell.

Discussion

43.	Binomial system of a nomenclature means that every organism has (a) two names, one scientific and one popular. (b) one scientific name consisting of a generic and a specific part. (c) one name given by two scientists. (d) two names, one denoting the latinised name of the place and the other of the person, who determined it.
Answer» (b) one scientific name consisting of a generic and a specific part.

Discussion

44.	Plants that grow in the desert are called (a) hydrophytes (b) mesophytes (c) xerophytes (d) epiphytes
Answer» (c) xerophytes

Discussion

45.	Choose the forms in which most plants absorb nitrogen (i) Proteins (ii) Nitrates and Nitrites (iii) Urea (iv) Atmospheric nitrogen (a) (i) and (iii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)
Answer» (b) (ii) and (iii)

Discussion

46.	The waste materials in plants are stored in the form of (a) water (b) gums and resins (c) minerals (d) sugar
Answer» (b) Resin is a hydrocarbon secretion of many plants, particularly coniferous trees, valued for its chemical constituents and uses such as varnishes, adhesives, as an important source of raw materials for organic synthesis, or for incense and perfume. Gum is also a byproduct produced and is sent out through the bark of the tree.

Discussion

47.	The main effect of cytokinin in plants is to (a) improve the quality of fruits (b) prevent the growth of lateral buds (c) regulate opening and closing of stomata (d) stimulate cell division
Answer» (d) stimulate cell division

Discussion

48.	(a). Taking one example each of habitat loss and fragmentation, explain how the two are responsible for biodiversity loss. (b). Explain two different ways of biodiversity conservation?
Answer» (a). Habitat loss and fragmentation It is the primary cause for extinction. The tropical rain forests initially covered 14% of the land surface of the earth, but now they cover only 6% of land area. Total loss of a habitat deprives many animals and plants of their homes and they face extinction. When a large habitat becomes fragmented, animals requiring large territories and those with certain migratory habits start decreasing. (b). Ex- situ and In-situ are two different ways of biodiversity conservation: 1. Ex- situ conservation:- When there are situations where an animal or plant is endangered or threatened and needs urgent measures to save it from extinction, ex-situ (off-site) conservation is the desirable approach. Example - zoological parks, botanical garden and wildlife safaris. 2. In-situ conservation:- When we conserve and protect the whole ecosystem, its biodiversity at all levels is protected. We save the entire forest to save the tiger. This approach is called in-situ (on-site) conservation. Example -biosphere reserves, national parks, and biodiversity hotspots

48.

(a). Taking one example each of habitat loss and fragmentation, explain how the two are responsible for biodiversity loss. (b). Explain two different ways of biodiversity conservation?

Answer»

(a). Habitat loss and fragmentation

It is the primary cause for extinction.
The tropical rain forests initially covered 14% of the land surface of the earth, but now they cover only 6% of land area.
Total loss of a habitat deprives many animals and plants of their homes and they face extinction.
When a large habitat becomes fragmented, animals requiring large territories and those with certain migratory habits start decreasing.

(b). Ex- situ and In-situ are two different ways of biodiversity conservation:

1. Ex- situ conservation:- When there are situations where an animal or plant is endangered or threatened and needs urgent measures to save it from extinction, ex-situ (off-site) conservation is the desirable approach. Example - zoological parks, botanical garden and wildlife safaris.

2. In-situ conservation:- When we conserve and protect the whole ecosystem, its biodiversity at all levels is protected. We save the entire forest to save the tiger. This approach is called in-situ (on-site) conservation. Example -biosphere reserves, national parks, and biodiversity hotspots

Discussion

49.	The flowers are Zygomorphic in:(a) Mustard(b) Gulmohar(c) Cassia(d) Datura(e) ChillyChoose the correct answer from the options given below:(1) (b), (c) Only(2) (d), (e) Only(3) (c), (d), (e) Only(4) (a), (b), (c) Only
Answer» Correct option is (1) (b), (c) Only

Discussion

50.	Which tissue lacks blood supply and heals slowly? (a) Nervous (b) Muscle (c) Cartilage (d) Bone
Answer» (c) Cartilage

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Arrange the following in correct order of their basic strength (I) \( OH ^{-} \) (II) \( CH _{3} COO ^{-} \) (III) \( Cl ^{-} \) a) \( III &gt; Il &gt; I \) b) \( I &gt; II &gt; III \) c) \( I &gt; III &gt; II \) d) \( I I&gt;I I I&gt;I \)

Arrange the following in their nucleophilicity order :A. C6H5O- B. C6H5S- C. C6H5C-H2 D. CH3COC-H21. B&gt;C&gt;D&gt;A. 2. A&gt;D&gt;B&gt;C3. B&gt;D&gt;C&gt;A. 4. C&gt;D&gt;A&gt;B

19. Arrange the following in correct order of their basic strength(I) \( OH ^{-} \)(II) \( CH _{3} COO ^{-} \)(III) \( Cl ^{-} \)a) \( III > Il > I \)b) \( I > II > III \)c) \( I > III > II \)d) \( I I>I I I>I \)

The chemical that initiates electrolysis in Halls process isA. `Na_(3)AlF_(6)`B. `Al_(2)O_(3)`C. `Al(OH)_(3)`D. `AlF_(3)`

Which of the following writs may be issued to enforce a Fundamental Right?(a) Habeas Corpus(b) Mandamus(c) Prohibition(d) Certiorari

Which of the following is not an ore of lead?A. GalenaB. CassiteriteC. AnglesiteD. Cerussite

Flux is used to removeA. acidic impuritiesB. basic impuritiesC. all impurities form oresD. both`(a)`and`(b)

Which of the following is a carbonate ore?A. PyrolusiteB. MalachiteC. DiasporeD. Cassiterite

Calcination is used in matallurgy for removal ofA. water and sulphideB. water and `CO_(2)`C. `CO_(2)`and `H_(2)S`D. `H_(2)O`and `H_(2)S`

Lepidolite is an ore ofA. KB. NaC. LiD. All of these

How many molecules of ammonia are required to form 8 molecules of ureaA. 24B. 8C. 16D. 4

Which of the following is not an ore of IronA. MagnetiteB. HaematiteC. LimoniteD. Cuprite

Pb and Sn are extracted from their chief ore by `:`A. Carbon reduction, self-reductionB. Self-reduction, carbon reductionC. Electrolytic reduction, cyanide processD. Cyanide process, electrolytic reduction

Blood of human beings containA. FeB. MgC. CoD. Al

The substance not likely to contain `CaCO_(3)` is:A. Sea shellsB. DolomiteC. Marble statueD. Calcined gypsum

(b) Platinum, indium etc. are known as noble metals because they are ____towards many common reagents.

( c) ____iron is the purest form of iron.A. SteelB. Wrought ironC. Cast ironD. Pig iron

Sandstone in some iron ores is removed byA. Carbon filtersB. Compressesd airC. LimestoneD. Sulphuric acid

( c) ____iron is the purest form of iron.

Which is not a silver ore ?A. ArgentiteB. SideriteC. Horn silverD. Ruby silver

The chemical composition of slag formed during the smelting process in the extraction of copper isA. `Cu_(2) O + FeS`B. `FeSiO_(3)`C. `CuFeS_(2)`D. `Cu_(2)S + FeO`

(d) Passivity of iron is due to the formation of thin film of ____on its surface.

Calcination of ores involves heating the ore below its fusion temperature inA. presence of superheated steamB. absence of air or limited supply of airC. an atmosphare of nirogenD. presence of air

By which of the following processes is an oxide ore readuced to the free metal ?A. CalcinationB. LeachingC. SmeltingD. Roasting

( e) Phenimenon of removing layers of basic oxides from metals before electroplating is called _____.

Roasting of ores is done inA. Presence of an execess of air or oxygenB. Presence of superheated steamC. Absence of airD. Presence of a limited supply of air

Which does not contain aluminium ?A. BauxiteB. CorundumC. DiasporeD. Dolomite

The metal that cannot obtained by electrolysis of an aqueous solution of its salts is `:`A. AgB. MgC. CuD. Cr

Ferric oxide blast furnace is reduced byA. CB. COC. `H_(2)`D. `CO_(2)`

Electric furnaces are lined with magnesia becauseA. It melts at a very high temperatureB. It is not affected by acidsC. It has no effect of electricityD. It liberated oxygen on heating

Rutile is an ore ofA. TiB. MnC. CaD. Mg

Roasting of ores is done inA. moisture is removedB. non-metals as their volatile oxide are removedC. ore become porocus.D. all the above.

What is the key difference between primary and secondary sewage treatment?

What is sewage? In which way can sewage be harmful to us?

Name any two species of fungus, which are used in the production of the antibiotics.

The fertilized egg or the zygote gets implanted in the (a) fallopian tube (b) ovary (c) uterus (d) vagina

The rules of heredity determine the process by which ________ and _________ are reliably inherited. (a) shape and size (b) traits and characteristics (c) Both (1) and (2) (d) Neither (1) nor (2)

Molecular movements are needed for life (a) for repairing and maintaining structures (b) for nutrition (c) for respiration (d) for repairing only

Selection of variants by environmental factors (a) forms the basis of evolutionary processes (b) forms the basis of reproduction (c) cause inheritance of traits (d) have different kind of advantages

The communication between CNS and other parts of the body is facilitated by (a) peripheral nervous system (b) brain (c) spinal cord (d) reflexes

Enzymes are (a) vitamins (b) proteins (c) carbohydrates (d) fats

Plants that grow in the desert are called (a) hydrophytes (b) mesophytes (c) xerophytes (d) epiphytes

Choose the forms in which most plants absorb nitrogen (i) Proteins (ii) Nitrates and Nitrites (iii) Urea (iv) Atmospheric nitrogen (a) (i) and (iii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)

The waste materials in plants are stored in the form of (a) water (b) gums and resins (c) minerals (d) sugar

The main effect of cytokinin in plants is to (a) improve the quality of fruits (b) prevent the growth of lateral buds (c) regulate opening and closing of stomata (d) stimulate cell division

(a). Taking one example each of habitat loss and fragmentation, explain how the two are responsible for biodiversity loss. (b). Explain two different ways of biodiversity conservation?

The flowers are Zygomorphic in:(a) Mustard(b) Gulmohar(c) Cassia(d) Datura(e) ChillyChoose the correct answer from the options given below:(1) (b), (c) Only(2) (d), (e) Only(3) (c), (d), (e) Only(4) (a), (b), (c) Only

Which tissue lacks blood supply and heals slowly? (a) Nervous (b) Muscle (c) Cartilage (d) Bone

Arrange the following in correct order of their basic strength (I) \( OH ^{-} \) (II) \( CH _{3} COO ^{-} \) (III) \( Cl ^{-} \) a) \( III > Il > I \) b) \( I > II > III \) c) \( I > III > II \) d) \( I I>I I I>I \)

Arrange the following in their nucleophilicity order :A. C6H5O- B. C6H5S- C. C6H5C-H2 D. CH3COC-H21. B>C>D>A. 2. A>D>B>C3. B>D>C>A. 4. C>D>A>B

The rules of heredity determine the process by which and _ are reliably inherited. (a) shape and size (b) traits and characteristics (c) Both (1) and (2) (d) Neither (1) nor (2)