Explore topic-wise InterviewSolutions in Current Affairs.

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.	But-1-ene is formed in reaction (more than one correct options)
Answer» SOLUTION :

2.	Burning of fossil fuels is the main source of pollution due to :
Answer» nitrogenoxide nitric oxide nitrous oxide sulphur dioxide Answer :D

3.	Burning of coal is reprsented as C_((s))+O_(2(g))toCO_(2(g)). The rate of this reaction is increased by
Answer» decrease in the CONCENTRATION of OXYGEN Powdering the lumps of coal decreasing the TEMPERATURE of coal Providing inert atmosphere Answer :B

4.	Burning offossilshouldhave BODvalue :
Answer» NITROGEN OXIDE Nitricoxide Nitrousoxide SULPHUR DIOXIDE ANSWER :D

5.	Buna-S rubber is which of the following of 1-3-butadiene and tyrene
Answer» POLYMERS COPOLYMER ADDITION Condensation polymer Solution :Buna-S is a copolymer of 1,3-butadiene and styrene

6.	Buna -S is prepare from
Answer» 1,3-butadiene and VINYL CYANIDE 1,3-butadiene and STYRENE 1,2-butadiene and vinyl cyanide 1,2 -butadieneand styrene ANSWER :B

7.	The monomers of Buna -S rubber are
Answer» chloroprene Styrene ACRYLONITRILE ADIPIC acid Answer :B

8.	Buna-S is formed by the condensation of
Answer» SODIUM and STYRENE styrene and ethene sodium and BUTADIENE butadiene and styrene Solution :butadiene and styrene

9.	Buna-S, is obtained by copolymerization of ...................with ...................
Answer» ANSWER :STYRENE , 1,3-butadiene

10.	Buna-S is a polymer of :
Answer» BUTADIENE only Butadiene & STYRENE Styrene only Butadiene & NITRYL SOLUTION :

11.	Which of the following is a copolymer ?
Answer» ANSWER :1

12.	Buna-S is a copolymer of butadiene and styrene.(T/F)
Answer» ANSWER :1

13.	Buna -S is a copolymer of:
Answer» STYRENE and 1,3-butadine Styrene and ethylene 1,3-butadiene and ethylene None Answer :A

14.	Buna rubber is a polymer of
Answer» 1,3-butadiene Vinyl acetate Styrene None of these Answer :A

15.	Buna rubber is a polymer of :
Answer» 1,3-butadiene Vinyl acetate Styrene None ANSWER :A

16.	Buna - N synthetic rubber is a copolymer of
Answer» `CH_2=CH-CNand H_2C=CH-UNDERSET(CH_3)underset(\|)C=CH_2` `H_2C=CH-OVERSET(CL)overset(\|)C=CH_2 and H_2C=CH-CH=CH_2` `H_2C=CH-CH=CH_2and H_5C_6-CH=CH_2` `H_2C=CH-CHand H_2C=CH-CH=CH_2` ANSWER :D

17.	Buna -N synthetic rubber is a copolymer of :
Answer» ` H_2C =CH-CH=CH_2 and H_5 C_6 -CH =CH_2` ` H_2C =CH -CN and H_2C =CH -CH =CH_2` ` H_2C =CH-CN and H_2C =CH -C =underset( CH_3) underset(\|)CH_2` ` H_2C =CH -overset( CL) overset( \| )C= CH_2 and H_2C =CH -CH =CH_2` Answer :B

18.	Buna-N synthetic rubber is a copolymer of:
Answer» `H_2C=CH-CH=CH_2` and `H_5C_6-CH=CH_2` `H_2C=CH-CN` and `H_2C=CH-CH=CH_2` `H_2C=CH-CN` and `H_2C=CH-underset(CH_3)underset(\|)C=CH_2` `H_2C=CH-overset(Cl)overset\|C=CH_2` and `H_2C=CH-CH=CH_2` SOLUTION :Buna-N is a COPOLYMER of butadiene `(CH_2=CH-CH=CH_2)` and ACRYLONITRILE `(CH_2=CHCN)`.

19.	Buna-N is used in making oil seals and tank linings, etc. because
Answer» it is resistant to the ACTION of lubricating OIL and organic sovlents it is more ELASTIC than natural rubber it can be stretchedtwice its length . it does not melt at HIGH TEMPERATURES. Answer :A

20.	Buna -N is polymer of
Answer» 1,3 -butadiene and ACRYLONITRILE 1,3-butadiene and styrene acrylonutrile and vinyl CHLORIDE 1,3-butadiene and isoprene ANSWER :D

21.	Buna-N is a polymer of:
Answer» 1,3-butadiene and acrylonrile Acrylonitrile Styrene None of these Answer :A

22.	BuNa - N is a polymer of
Answer» BUTADIENE Butadiene and SODIUM ACETANILIDE Butadiene and styrene Butadiene and VINYL cyanide Answer :D

23.	Buna -N is
Answer» FIBRES elastomer THERMOSETTING polymer THERMOPLASTIC polymer Answer :B

24.	Buna-N and Buna-S are examples of elastomers/ thermoplastics.
Answer» SOLUTION :ELASTOMERS

25.	Buna-S is a :
Answer» NATURAL POLYMER Synthetic polymer Sulphur polymer NONE of these Answer :B

26.	Bullet proof helmets are made from
Answer» Lexan Saran Glyptal Thiokol SOLUTION :Lexn is USED for making BULLET PROOF helmets.

27.	Buffer solution is prepared by mixing
Answer» STRONG ACID + its SALT of strong base WEAK acid + its salt of weak base Strong acid + its salt of weak base Weak acid + its salt of strong base Answer :D

28.	Buffer solution can be obtained by mixing aqueous solution of
Answer» `CH_3 COONa and` EXCESS `HCI` `CH_3 COONa and CH_3 COOH` `NaOHand NaCI` `CH_3 COOH and` exces `NAOH` SOLUTION :`CH_3 COONa and CH_3 COOH`

29.	Bufferis a solutionwhosepH doesnot changesignificantlyon addition of a small amountof acidoraikali or no dilution . Answerthefollowingquestions : The ratio of pH(approximately ) of aolution(I) containing 1 moleof CH_(3)COONaand 1moleof HCl nd solution(II) containing1 moleof CH_(3)COONaand 1 moleof aceticacidin one litreis :
Answer» `1:2` `2:1` `1:3` `3:1` SOLUTION :Solution (I) `to {:(CH_(3)COONa,+,HCL,to,CH_(3)COOH,+,NaCl),(1,,1,,0,,0),(0,,0,,1,,1):}` ` :. [CH_(3)COOH]= ("No of moles ")/("Volume of solution ") = 1/1= 1 ` ` [H^(+)]= C propsqrt((K_(a))/C ) = SQRT(K_(a)C) = sqrt(K_(a))` i.e`pH_(1) = -1/2 logK_(a) = 1/2 pK_(a)` SLOUTION `to{:(CH_(3)COONa,+,CH_(3)COOH),(1,,1):}` `pH_(2) =pK_(a) +log. 1/1` `pH_(2) = pK_(a)` ` :. (pH_(1))/(pH_(2)) = 1/2`

30.	Buffer solutions have constant acidity and alkalinity because
Answer» These give unionized acid or base on reaction with added acid or alkali Acids and alkalies in these SOLUTIONS are shielded from ATTACK by other ions They have large excess of `H^(+)` or `OH^(-)` ions They have fixed value of pH Solution :On adding SMALL AMOUNT of acid `(H^(+))` and base `(OH^(-))`, weak acid or weak base will be form respectively.

31.	Buff colour is produced by the reaction of neutral FeCl_3 with:
Answer» OXALIC ACID Acetic acid Benzoic acid SALICYLIC acid. Answer :C

32.	Bu-C=CHoverset(LiNH_2)toAunderset((ii)H_2O)overset((i)PhCHO)toBoverset(MnO_2)toC Compound C of the above reaction cannot be :
Answer» SOLUTION :

33.	Brvicomin, the aggregation pheromone of the western pine bark beetle, contains a bicylic bridged ring system. Brevicomin is prepared by the acid catalyzed cyclization of 6,7-dihydroxy-2-nonanone. (i) Suggest a structure for brevicomin. (ii) Devise a synthesis of 6,7-dihydroxy-2-nonamone from 6-bromo-2-hexanone. You may also use three carbon alcohols and any required organic or inorganic reagents.
Answer» SOLUTION :ACID catalyzed acetal formation will LEAD to formation of Brevicomin.

34.	Brufen is used to relieve
Answer» PAIN constipation Fungal INFECTION BACTERIAL infection Answer :A

35.	Brownian movement is mainly is due to
Answer» Attraction between dispersion MEDIUM and DISPERSED phase particles Unbalanced impact of the dispersion medium on COLLOIDAL particles Scattering of light on sol particles Repulsion of colloidal particles by protective colloids Answer :B

36.	Brownian movement of colloidal particles is a______ property.
Answer» Kinetic Electrical Optical Magnetic Answer :A

37.	Brownian motion shown by colloidal particle is its ________ property
Answer» Optical Electrical Kinetic Chemical Answer :C

38.	Brown SnO is
Answer» an ACIDIC oxide basic oxide neutral oxide AMPHOTERIC oxide SOLUTION :Its is an acidic oxide.

39.	Brown ring tests is used for detection of nitrate (NO_(3)^(-)) radical.
Answer» Solution :Brown ring TEST isused for DETECTION of NITRATE `(NO_(3)^(-))` radical.

40.	Brown ring test s performed for which ion?
Answer» `NO_2^-` `NO_3^-` `HO^-` `H_2N^-` ANSWER :B

41.	Brown ring test is for
Answer» `NO_(3)^(-)` `Cl^(-)` I `Br^(-)` Solution :`NO_(3)^(-)+H_(2)SO_(4) to HSO_(4)^(-) + HNO_(3)` `6H_(2)SO_(4)+2HNO_(3)+3H_(2)SO_(4) to 3FE(SO_(4))_(3)+4H_(2)O+2NO` `[FE(H_(2)O)_(6)]SO_(4). H_(2)O+NO to underset("Brown ring")([Fe(H_(2)O)_(5)(NO)]SO_(4))+2H_(2)O`

42.	Brown ppt ,of MnO(OH) on boilingwith PbO_(2) andcone HNO_(3)yields a pinkcolourationondilutiondue to theformation of
Answer» `HMnO_(4)` `H_(2)MnO_(4)` `Pb(MnO_(4))_(2)` `PbMnO_(3)` ANSWER :a

43.	(brown fumes & Pugent smell)(Explosive Product intermediate) Identify the missing compounds. Give the equation from A to B and A to C
Answer» SOLUTION :N//A

44.	Brown colour of the complex [Fe(H_(2)O)_(5)(NO)]SO_(4) is due to C. T. spectrum which causes momentary change in oxidation state. Find out oxidation state of Fe in this complex.
Answer» ANSWER :1

45.	Brown colour of HNO_3 can be removed by....
Answer» ADDING MG powder. PASSING AIR through warm ACID. passing `NH_3` through acid. boiling the acid Solution :passing air through warm acid.

46.	Broverset((i)Mg," ether")underset((ii)CO_(2))rarr Aoverset(H_(3)O^(+))rarrB'B' is ………….
Answer» SOLUTION :

47.	Brown colour in HNO_3 can be removed by
Answer» adding Mg powder boiling the ACID PASSING `NH_3` through acid passing AIR through warm acid SOLUTION :Colour is due to presence of `NO_2` in the solution. Removed by passing air . `NO_2` gets removed ALONG with air.

48.	Bronze is often used to make statues and medals whereas brass is used in making utensils , scientific apparatus and cartridges . Both brass and bronze are copper containing alloys , yet they differ in their chemical composition for additionally containing
Answer» zinc in brass and TIN in BRONZE chromium in brass and NICKEL inbronze nickel in brass and tin in bronze IRON in brass and nickel in bronze Solution :Brass is CU(80%) + Zn(20%) and bronze is Cu (90%) + Sn(10%)

49.	Bronze is mixture of ………. metals.
Answer» CU, SN Cu, Zn Zn, Sn Cu, Pb Answer :A

50.	Bronze is an alloy of
Answer» CU + SN Cu + ZN PB + Sn + Zn Pb + Zn Solution :Cu + Sn