Explore topic-wise InterviewSolutions in Current Affairs.

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1.

Nuclides

Answer»

Have specific ATOMIC NUMBER
Have same number of protons
Have specific atomic number and mass numbers
Are ISOTOPES

Solution :The isotopes of an element is REPRESENTED by writing the SYMBOL of the element and representing the atomic number and mass number as subscript and superscript respectively are called nuclides
2.

Nuclic acids are called acids mainly because of the presence of

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`-COOH` group
`-OH` group of SUGAR unit
`-OH` group of the HETEROCYCLIC base
`-OH` group of PHOSPHATE unit 

Answer :D
3.

Nucleus of an element contains 9 protons Its valency would be :

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1
2
3
5

Answer :A
4.

Nucleus of deuterium contains:

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ONE PROTON and One neutron
One proton and one electron
Two PROTONS
Two protons and one neutron

Answer :A
5.

Nucleus model of the atom was proposed by:

Answer»

Thomson
Neil Bohr
Mosley
Rutherford

Answer :D
6.

Nucleosides are joined together by phosphodiester linkage between 5' and 3' carbon atoms of pentose sugar.

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ANSWER :FALSE
7.

Nucleotides and nucleosides mainly differ from each other in :

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PRESENCE of PHOSPHATE units
Presence of BASE units
Presence of NUCLEIC acids
None

ANSWER :A
8.

Nucleoside on hydrolysis gives

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PENTOSE SUGAR and PURINE base
Pentose sugar, phosphoric ACID, purine or pyrimidine base
Pentose sugar and a heterocyclic base
Heterocyclic base and phosphoric acid 

Answer :C
9.

Nucleoside on hyd rolysis gives

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an ALDOPENTOSE and HETEROCYCLIC BASE
an aldopentose and PHOSPHORIC acid
an a ldopentose , heterocyclic base and phosphoric acid
heterocyclic base and phosphoric acid

Answer :A
10.

Nucleoside of DNA contain

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`BETA`-D-ribose SUGAR and PHOSPHORIC ACID
`beta`-D-ribose sugar and hetrocyclic BAES
`beta` -D 2-deoxyribose sugar and phosphoric acid
`beta`D 2-deoxyribose sugar and hetrocyclic baes

Answer :D
11.

Nucleoside is composed of…………………….

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SUGAR+ BASE + PHOSPHATE
Base + Sugar
Phosphate + Sugar
Phosphate + Base

SOLUTION :Base + Sugar
12.

Nucleoside involvesthecombination of

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SUGAR + BASE +`H_3PO_4`
Sugar + base
Sugar + ACID
None

Answer :B
13.

Nucleoside consist of

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SUGAR and `H_3PO_4`
sugar and BASE
`H_3PO_4` and base
only PENTOSE sugar unit

Answer :B
14.

Nucleoprotein is a _____ type protein.

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ANSWER :CONJUGATED
15.

Nucleophilicity order is correctly represented by

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`CH_(3)^(-) lt NH_(2)^(-) lt HO^(-) lt F^(-)`
`NH_(2)^(-) gt HO^(-) F^(-) gt CH_(3)^(-)`
`CH_(3)^(-) gt NH_(2)^(-) gt HO^(-) gt F^(-)`
`NH_(2)^(-) gt F^(-) gt HO^(-) gt CH_(3)^(-)`

SOLUTION :As the electronegativity of the atom DECREASES, its nucleophilicity increases. Thus, option () is correct
16.

Nucleophilic substitution of primary alkyl chlorides with sodium acetate is catalysed by sodium iodide. Discuss

Answer»

Solution :Primary lakyl chlorides `(R-CH_(2)-Cl)` are less reactive towards nucleophilic substitution as compared to primary alkyl IODIDES `(R-CH_(2)-I)` because C-I bond can cleave moreasily that `C-Cl` bond o accout of less bond dissociation enthalpy. Therefore, the catalyst sodium iodide CONVERTS alkyl chloride to alkyl iodide by finkelstin REACTION. the latter react with sodium acetate to form ester.
`UNDERSET("ETHYL chloride")(CH_(3)-CH_(2)-)Cl+NaItounderset("Ethyl iodide")(CH_(3)-CH_(2)-)I+NaCl`
`underset("Ethyl iodide")(CH_(3)-CH_(2)I+CH_(3)COONa)tounderset("Ethyl acetate")(CH_(3)COOC_(2)H_(5)+NaI`
17.

Nucleophilic substitution reaction of optically active halide, PIC is accompanied by

Answer»

INVERSION of configuration
Retention of configuration
Racemisation
Both (1) and (3)

ANSWER :C
18.

Nucleophilic attack on carbonyl carbon changed its hydridisation from

Answer»

SP to `sp^(2)`
`sp^(2) " to "sp^(3)`
`sp^(3) " to " sp^(2)`
sp to `sp^(3)`

ANSWER :B
19.

Nucleophilic substitution in aryl halides is facilitated by electron withdrawing groups while electrophilic substitution is facilitated by electron releasing groups. Why?

Answer»

Solution :Nucleophilic substitution in aryl halides takes place VIA carbanion as intermediate, which are stabilised by electron WITHDRAWING groups. Electrophilic substitution takes place through carbocations as intermediates, which are stabilised by electron releasing groups. The rate of the REACTION INCREASES if the intermediate INVOLVED in this reaction is stabilised.
20.

Nucleophilic Aromatic substitution (SN_(Ar)): A substituted benzene derivative containing - NO_(2) and Cl group at p-position is subjected to Nu- substitution The cumulative effect of their fluorine active the rings of penta and hexa fluorobenzene toward nucleophilic aromatic substitution. What is compound X in the following synthesis ?

Answer»




SOLUTION :BASIC`S_(N)AR`
21.

Nucleophilic Aromatic substitution (SN_(Ar)): A substituted benzene derivative containing - NO_(2) and Cl group at p-position is subjected to Nu- substitution Which is the best route for the synthesis of Strating from benzen of ?

Answer»

`underset(FeBr_(3))overset(Br_(2))rarr underset(H_(2)SO_(4))overset(HNO_(3))rarr underset(H_(2)SO_(4))overset(HNO_(3))rarr underset(CH_(3)OH)overset(NaOCH_(3))rarr`<BR>`underset(H_(2)SO_(4))overset(HNO_(3))rarr underset(H_(2)SO_(4))overset(HNO_(3))rarr underset(FeBr_(3))overset(Br_(2))rarr underset(CH_(3)OH)overset(NaOCH_(3))rarr`
`underset(H_(2)SO_(4))overset(HNO_(3))rarr underset(FeBr_(3))overset(Br_(2))rarr underset(H_(2)SO_(4))overset(HNO_(3))rarr underset(CH_(3)OH)overset(NaOCH_(3))rarr`
`underset(H_(2)SO_(4))overset(HNO_(3))rarr underset(FeBr_(3))overset(Br_(2))rarr underset(CH_(3)OH)overset(NaOCH_(3))rarr underset(H_(2)SO_(4))overset(HNO_(3))rarr`

Solution :Basic `S_(N)Ar`
22.

Nucleophilic Aromatic substitution (SN_(Ar)): A substituted benzene derivative containing - NO_(2) and Cl group at p-position is subjected to Nu- substitution , Product (A) is:

Answer»

<P>


Solution :o, p LEAVING group REPLACE in `S_(N)AR`
23.

Nucleophilic Aromatic substitution (SN_(Ar)): A substituted benzene derivative containing - NO_(2) and Cl group at p-position is subjected to Nu- substitution , Product (B) is:

Answer»




SOLUTION :
24.

Nucleophilic Aromatic substitution (SN_(Ar)): A substituted benzene derivative containing - NO_(2) and Cl group at p-position is subjected to Nu- substitution Which of the following is most reactive towards SN_(Ar)

Answer»

<P>


SOLUTION :`RARR` More `NO_(2)` GROUP at o, p
25.

Nucleophilic Aromatic substitution (SN_(Ar)): A substituted benzene derivative containing - NO_(2) and Cl group at p-position is subjected to Nu- substitution Match the column I and II {:(,"Column (I)",,"Column (II)",),(,X = "halogen",,"relative reactivity toward" (SN_(Ar)),),((a),-F,(p),312,),((b),-Cl,(q),1,),((c),-Br,(r),0.8,),((d),-I,(s),0.6,):}

Answer»


SOLUTION :`rArr` Mesenhemier COMPLEX is more STABLE by stron `-I` GROUP.
26.

Nucleophilic Aromatic substitution (SN_(Ar)): A substituted benzene derivative containing - NO_(2) and Cl group at p-position is subjected to Nu- substitution If step -2 were rate determining step, which halogen of aryl halide is most reactive towards SN_(Ar).

Answer»

Fluoride
Chloride
Bromide
Iodide

Solution :`RARR` GOOD LEAVING GROUP
27.

Nucleophilic addition of Grignard reagent to aldehydes/ketones take place in the presence of ……………………. followed by acid hydrolysis gives …………………...

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SOLUTION :DRY ETHER, ALCOHOL
28.

Nucleophilic addition reaction is mostfavored in

Answer»




ANSWER :D
29.

Nucleophiles are:

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ELECTRON loving
Electron hating
Nucleus loving
Nucleus hating

Answer :C
30.

Nucleophiles are

Answer»

`H_(2)` O
I
NH_(3)
`BF_(3)`

Solution :(a,b,C): A SPECIES having -ve CHARGE or LONE pair of electrons are nucleophile. H
31.

Nucleic acids were first discovered by

Answer»

Altman
FLEMING
Meischer
KOCH

Solution :NUCLEIC ACIDS were FIRST discovered by meischer.
32.

Nucleic acids contain _____ sugar.

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ANSWER :PENTOSE or 5-carbon
33.

Nucleic acids are the polymers of ............

Answer»

Nucleotides
Nucleotides
BASES
SUGARS

ANSWER :B
34.

Nucleic acids contain :

Answer»

4 purine bases
4 PYRIMIDINE bases
2 purine bases and 3 pyrimidine bases
4 pyrimidine bases and one purine base

Answer :C
35.

Nucleic acids are the polymers of

Answer»

nucleosides
nucleotides
bases
sugars

Solution :Nucleic acids are LONG chain POLYMERS of nucleotides HENCE they are also CALLED polynucleotides.
36.

Nucleic acids are the polymers of ………..

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NUCLEOSIDES
NUCLEOTIDES
BASES
SUGARS

SOLUTION :Nucleotides
37.

Nucleic acid is made up of _______.

Answer»

an ORGANIC BASE
a SUGAR unit
PHOSPHORIC acid
all of these

Solution :all of these
38.

Nucleic acid is a polymer of…………. .

Answer»

NUCLEOSIDES
`ALPHA`-aminoacids
nucleotides
glucose

ANSWER :C
39.

Nuclei of isotopes differ in

Answer»

The NUMBER of protons
The number of NEUTRONS
The number of protons and neutrons both
None of these

Solution :ISOTOPES DIFFER in number of neutrons but have same number of protons.
40.

Nuclei of a radioactive element 'A' are being produced at a constant rate alpha the element has a decay constant lambda At time t=0 there are N_(0) nuclei of the element If alpha = 4N_(0) lambda the number of nuclei of A when A has reached steady state:

Answer»

0
`4N_(0)`
`2N_(0)`
`N_(0)`

ANSWER :B
41.

Nuclei of a radioactive element 'A' are being produced at a constant rate alpha the element has a decay constant lambda At time t=0 there are N_(0) nuclei of the element If alpha=2N_(0)lambdathe number of nuclei of A afterundergone radioactivity decay till time t=(l n2) / lambda:

Answer»

`0.5N_(0)`
`1.5N_(0)`
`((4 l n2-1)N_(0))/2`
`((4L n2-3)N_(0))/2`

ANSWER :C
42.

Nuclei of a radioactive element 'A' are being produced at a constant rate alpha the element has a decay constant lambda At time t=0 there are N_(0) nuclei of the element The number of nuclei of A at time 't' is

Answer»

`(ALPHA)/(lambda)(1-e^(-lambdat))`
`N_(0) e^(-lambdat)`
`1/(lambda)[alpha-(alpha- lambda N_(0))e^(-lambdat]`
`(N_(0).alpha)/lambda[1-((1-(lambda)/alpha))e^(-lambdat)]`

Answer :C
43.

Nuclei of a radioactive element 'A' are being produced at a constant rate alpha the element has a decay constant lambda At time t=0 there are N_(0) nuclei of the element If alpha=2N_(0)lambdathe number of nuclei of A after t=(l n2)/lambda will become:

Answer»

ZERO
`2N_(0)`
`1.5 N_(0)`
`0.5 N_(0)`

ANSWER :C
44.

Nuclear types of proteins based on molecular shape .

Answer»

1
2.
3

ANSWER :C
45.

Nuclear theory of the atom was put forward by:

Answer»

RUTHERFORD
ASTON
NEILS Bohr
J.J. Thomson

ANSWER :A
46.

Nuclear theory of the atom was put forward by

Answer»

RUTHERFORD
Aston
Neils BOHR
 J.J. THOMSON

ANSWER :A
47.

Nuclear reactivity of Na and Na^(+) is same because both have

Answer»

Same ELECTRON and proton
Same proton and same neutron
Different electron and proton
Different proton and neutron

Solution :Nuclear REACTIVITY DEPENDS UPON the NUMBER of protons and neutrons
48.

Nuclear reactions accompanied with emission of neutron (s) are

Answer»

`._(13)^(27)Al + ._(2)He^(4) rarr ._(15)^(30)P`
`._(6)^(12)C + ._(1)^(1)H rarr ._(7)^(13)N`
`._(15)^(30)P rarr ._(14)^(30)Si + ._(1)^(0)e`
`._(96)^(241)Am + ._(2)^(4) He rarr ._(97)^(244)Bk + ._(1)^(0)e`

Solution :(a) `._(13)Al^(27) + ._(2)He^(4) rarr._(15)P^(30) + ._(0)n^(1)`,
(b) `._(96)Am^(241) + ._(2)He^(4) rarr ._(97)BK^(244) + ._(1)e^(0) + ._(0)n^(1)`
49.

Nuclear reactions accompared with emission of neutron are :

Answer»

`""_(13)^(27) Al + ""_(2)^(4) He to ""_(15)^(30) P`
`""_(6)^(12)C + ""_(1)^(1) H to ""_(7)^(13) N`
`""_(15)^(30) P to ""_(14) ^(30) Si + ""_(+1)^(0)e`
`""_(96)^(243) Am + ""_(2)^(4) He to ""_(97)^(244) Bk + ""_(1)^(1) H`

Solution :`""_(13) Al^(27) + (""_(2) He^(4)) to ""_(15) Si^(30) + ""_(0) n^(1) , (B) ""_(0) r^(0) , (c) 0 , (d) ""_(0) n^(1)`
50.

Nuclear reactions accompained with emission of neutron(s) are

Answer»

`""_(13)^(27)Al + ""_(2)^(4)He to ""_(15)^(30)P`
`""_(6)^(12)C+ ""_(1)^(1)H to ""_(7)^(13)N`
`""_(15)^(30)P + ""_(-1)^(0)e to ""_(14)^(30)Si`
`""_(96)^(241)Cm + ""_(2)^(4)He to ""_(97)^(244)Bk + ""_(-1)^(0)e`

Solution :`""_(13)^(27)Al + ""_(2)^(4)He to ""_(15)^(30)P + ""_(0)^(1)n`
`""_(96)^(241)Cm + ""_(2)^(4)He to ""_(97)^(244)Bk + ""_(+1)^(0)e + ""_(0)^(1)n`.