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.

Mass defect in the nuclear reactions may be expressed in terms of the atomic masses of the parent and daughter nuclides in place of their nuclear masses. The mass defect of the nuclear reaction: ._(5)B^(8) rarr ._(4)Be^(8)+e^(+) is

Answer»

`Deltam=at` mass of `._(5)B^(8)-at` mass of `._(4)Be^(8)`
`Deltam=at` mass of `._(5)B^(8)-at` mass of `._(4 )Be^(8)-` mass of one ELECTRON
`Deltam=at` mass of `._(5)B^(8)-at` mass of `._(4)Be^(8)+` mass of one electron
`Deltam=at` mass of `._(5)B^(8)-at` mass of `._(4)Be^(8)-` mass of TWO electrons

Answer :D
Discussion
2.

Mass and energy are conserved. It is demonstrated by ___________ .

Answer»

FIRST LAW of thermodynamics
law of CONSERVATION of energy
law of conservation of mass
modified FORM of `1^(st)` law of thermodynamics

Answer :D
Discussion
3.

Mass and energy are conserved is demonstrated by

Answer»

first law of thermodynamics
law of CONSERVATION of energy
law of conservation of MASS
modified form of Ist law of thermodynamics

Solution :In modified form of Ist law of thermodynamics, mass and energy both are CONSERVED.
Discussion
4.

Marshall's acid overset(H_(2)O) to A+B Aoverset(H_(2)O)toB+C If P and Q represent maximum number of atoms that can lie in a plane of compound A and C respectively. Then, find out value of (P-Q).

Answer»


Solution :`UNDERSET("Marshall's acid")(H_(2)S_(2)O_(8))+H_(2)O to underset((A))(H_(2)SO_(5))+underset((B))(H_(2)SO_(4))`
`underset((A))(H_(2)SO_(5))+H_(2)O to underset((C))(H_(2)O_(2))+underset((B))(H_(2)SO_(4))`

P=5
Q=3
P-Q=5-3=2
Discussion
5.

Marshall's acid (H_(2)S_(2)O_(8)) or peroxodisulphuric acid is prepared by the electrolytic oxidation of mmolH_(2)SO_(4) as : 2H_(2)SO_(4) rarr H_(2)S_(2)O_(8)+2H^(o+)+2e^(-) O_(2)(g) and H_(2)(g) are obtained as byproducts. In such electrolysis 4.48L of H_(2)(g) and 1.12L or O_(2)(g) were produced at STP. The weight of H_(2)S_(2)O_(8) formed is a. 9.7g""b.19.4g""c.14.5g""d.29.1g

Answer»

Solution :`b.` Refer Section `(point h)`.
Aqueous `UNDERSET((dil or conc))(H_(2)SO_(4)) overset(El ectrolysis)rarr2H^(o+)+SO_(4)^(2-)`
At anode, two reactions are COMPETING `:`
`i. 2SO_(4)^(2-) rarr S_(2)O_(8)^(2-)+2e^(-)`
`ii. H_(2)O rarr (1)/(2)O_(2)+2H^(o+)+2e^(-)`
At cathode, only one reaction occurs `:`
`2H^(o+) (` from `H_(2)SO_(4)) +2e^(-) rarr H_(2)(g)`
SINCE onereaction at cathode and two reactions at anode are taking place, therefore, the EQUIVALENT of `H_(2)(g)` produced at cathode at cathode should be equal to the equibalent of `O_(2)(g)` produced `+` equivalent of `H_(2)S_(2)O_(8)` formed.
`:.` Equivalent of `H_(2)=`Equivalent of `O_(2)+` Equivalent of `H_(2)S_(2)O_(8)`
`(4.48)/(22.4//2)=(1.12)/(22.4//4)+(W_(H_(2)S_(2)O_(8)))/(194//2)`
`0.4=0.2+(W)/(97)`
`:. W_(H_(2)S_(2)O_(8)=19.4g`
Discussion
6.

Marshall's acid is used for laboratory preporations of :

Answer»

`H_2O `
` D_2O `
`D_2O_2`
HDO

ANSWER :C
Discussion
7.

Marshall.s acid is,

Answer»

`H_2S_2O_5`
`H_2S_2O_8`
`H_2SO_3`
`H_2SO_5`

ANSWER :B
Discussion
8.

Marsh test is applied for the detection of

Answer»

N
P
As
S

Answer :C
Discussion
9.

Marsh gasmainlycontains :

Answer»

`C_(2)H_(2)`
`CH_(4)`
`H_(2)S`
CO

Answer :B
Discussion
10.

Markownikoff's rule provides guidance of addition of HX on

Answer»

`CH_(2)=CH_(2)`
`CH_(3)CH=CHCH_(3)`
`CH_(3)CH=CH_(2)`
`CH_(2)CHO`

Solution :Markownifkoffs RULE takes place inasymmetrical compound COMPOUNDS (C) is asymmetrical compound.
Discussion
11.

Marsh gas mainly contains _____ . (H_2S, CO, C_2H_2, CH_4)

Answer»

METHANE
Ethane
Propane
Butane

Answer :A::C::D
Discussion
12.

Markownikoff's rule governs the addition of

Answer»

ASYMMETRICAL reagent to symmetrical alkenes
symmetrical reagent to asymmetrical alkenes
asymmetrical reagent to asymmetricalalkenes
symmetrical REAGNET to symmetrical alkenes

ANSWER :C
Discussion
13.

Markownikoff rule provides guidance of addition of HBr

Answer»

`CH_2=CH_2`
`CH_3-CH_2-CH_3`
`CH_3CH=CHCH_3`
`CH_2=CHBr`

Solution :
According to MARKOWNIKOFF's rule H atom or POSITIVE part GOES to that CARBON atom which more hydrogenated
Discussion
14.

Markovnikov's rule governs the addition of

Answer»

UNSYMMETRICAL REAGENTS to SYMMETRICAL ALKENES
symmetrical reagents to unsymmetrical alkenes
unsymmetrical reagents to unsymmetrical alkenes
symmetrical reagents to symmetrical alkenes.

Answer :C
Discussion
15.

Mark the wrong statement. Carbon differs from other elements due to :

Answer»

its ABILITY to form multiple bonds
its TENDENCY to catenation
its ability to extend its octet.
its tendency to form ring compounds.

Answer :A
Discussion
16.

Mark the wrong statement. Halogens are all coloured

Answer»

This is DUE to absorbption of visible light by their molecules resulting in the excitation of outer electrons to higher ENRGY levels.
The small `F_2` molecules ABSORBS high energy violet radiations and appear light yellow in colour
The small `F_2`molecule absorb low energy yellow and green radiations and appear violet in colour
The excitation energy required by the small fluroine ATOMS is SMALLER than required by the large iodine atom

Answer :D
Discussion
17.

Mark the wrong statement about H_2SO_4 .

Answer»

It acts as a reducing agent
It acts as a OXIDISING agent
It acts as dehydrating agent
It is less VISCOUS than WATER.

Solution :It acts as a reducing agent
It is less viscous than water.
Discussion
18.

Mark the wrong statement among the following. The iron ore after washing is roasted with a little coal in excess of air. During roasting

Answer»

moisture is REMOVED
S and As are removed in the form of their volatile oxides
Any ferrous oxide is oxidised to femric wride
The mass becomes compact and THUS MAKES it suitable for READY REDACTION to metallic iron.

Answer :D
Discussion
19.

Mark the wrong statement about enzymes

Answer»

Enzymes are highly specific both in BINDING chiral substrates and in catalysing their reactions
Each enzyme can catalyse a number of SIMILAR reactions.
Enzymes catalyse chemical reaction by lowering the energy of activation
Enzymes are NEEDED only in very small amounts for their ACTION.

ANSWER :B
Discussion
20.

Mark the wrong statement about denaturation of proteins

Answer»

The primary structure of the protein does not change
Globular proteins are CONVERTED into fibrous proteins
Fibrous proteins are converted into globular
The BIOLOGICAL ACTIVITY of the protein is cancelled

Answer :D
Discussion
21.

Mark the wrong staement among the following. The iron ore after washing is roasted witha little coasl in excess of air. During roasting

Answer»

Moistuyre is removed
As and S are removed in the form of their VOLATILE oxides
Any FERROUS oide is oxidised to ferric oxide.
The MASS becomes compact and THUS makes it sutiable for ready REDUCTION to metallic iron.

Answer :D
Discussion
22.

Mark the variety of iron which has highest melting point

Answer»

PIG iron
Cast iron
Wrought iron
Steel

Answer :C
Discussion
23.

Mark the strongest acid

Answer»

HF
HCl
HBr
Hl

Solution :HI is STRONGEST acid because H-I bond is WEAKEST AMONG HALOGEN acids.
Discussion
24.

Markthe incorrentstatements.

Answer»

Catalyst PROVIDES an alternative pathway to REACTION mechanism
Catalyst raise theactivationenergy
Catalyst lowersthe activation ENERGY
Catalyst alters enthalpy CHANGE of thereaction

Solution :Function of Catalyst As the catalyst is added to the reaction medium rate of reation increases by decreasing activation energy of molecule. Hence, it follows an alternative pathway.
Catalyst does not change the enthalpy change of reaction. Energy of reactant and product remain same in both catalysed and UNCATALYSED reaction.
Hence, (a) and (d) are incorrect statements.
Discussion
25.

Mark the steel in which carbon % is highest

Answer»

MILD steel
Hard steel
Alloy steel
None of these

Answer :B
Discussion
26.

Mark the incorrect statements:

Answer»

CATALYST provides an alternative pathway to reaction mechanism.
Catalyst RAISES the activation energy.
Catalyst lowers the activation energy.
Catalyst ALTERS ENTHALPY change of the reaction.

ANSWER :C::D
Discussion
27.

Mark the incorrect used of the polymer.

Answer»

HIGH density POLYTHENE - Buckets , pipes
Nylon 6,6 -Ropes , bristles for BRUSHES
Orlon - Synthetic WOOL , carpets
Glyptal -Electrical switches , combs

Solution :Glyptal is USED in manufacture of paints and lacquers.
Discussion
28.

Mark the incorrect statements.

Answer»

Catalyst provides an ALTERNATIVE PATHWAY to reaction MECHANISM.
Catalyst raises the activation ENERGY.
Catalyst lowers the activation energy.
Catalyst not alters ENTHALPY change of the reaction.

Answer :A
Discussion
29.

Mark the incorrect statement (s).

Answer»

Potassium dichromateoxidises a secondaryalcoholinto a ketone .
Potassium permangante is a weaker oxidisingagent than potassiumdichromate.
Potassiumdichromateoxidises a secondary alcohol intoaldehyde.
Alkaline `KMnO_(4)` SOLUTION oxidises tertiaryalcohol to a mixture of a ketoneand an acid.

Solution :In acidie medium , ` KMnO_(4)`gives 5 oxygenwhileacidic ` K_(2)Cr_(2)O_(7) ` gives 3 oxygen. `K_(2)Cr_(2)O_(7)`oxidisessecondaryalcohols to KETONES.
Tertiary alcohols are resistanceto oxidation in NEUTRAL or alkaline`KMnO_(4)`solutionbut are readilyoxidisedin acidic solution ` (KMnO_(4)//H_(2)SO_(4))` to a mixtureof a ketoneand an acid eachcontaininglessernumber of carbonatomsthan theoriginalalcohol.
Discussion
30.

Markthe incorrect statement (s) for fuel cell

Answer»

it is USED in pollo space programme and for drinking water supply for astronauts
gydrogen and oxygen are bubbled through porous carbon electrode
catalyst like FINELY DIVIDED pt or pd are incorporated in to electrode
anode reaction is
`O_(2)2H_(2)O(l)+4e^(-)rarr4OH^(-)(aq)`

Solution :`H_(2)-O_(2)`fuel cell is usedover ordinary cell becausethey do not cause any pollutionand have high efficiencyof 60 - 70 %
Discussion
31.

Mark the incorrect pair from the following.

Answer»

Schottky defect- Equal number of cations and anions are missing
Frenkel defect - Dislocation of cation from its normal site to an interstitial site
Impurity defect- `CdCl_2` in AgCl CRYSTAL to create CATIONIC vacancy
METAL EXCESS defect - `Fe_(0.93)O`

Answer :D
Discussion
32.

Mark the incorrect example.

Answer»

KERATIN and myosin-Fibrous PROTEINS
Insulin and albumins -GLOBULAR proteins
Glycylalanine-Dipeptide
ENZYMES and haemoglobin -Derived proteins

Solution :Enzymes and haemoglobin are the examples of globular proteins.
Discussion
33.

Mark the incorrect statement.

Answer»

Copper is EXTRACTED by SMELTING in a reverberatory furnace.
Zinc is extracted by reduction of OXIDE with aluminium .
Aluminium is extracted by electrolysis of its oxide.
Iron is extracted by reduction of its oxide in BLAST furnace.

Solution :ZICE is extracted by reduction of oxide with coke.
Discussion
34.

Mark the gas which turns lime water milky

Answer»

`H_(2)S`
`SO_(2)`
`Cl_(2)`
`CO_(2)`

SOLUTION :`CO_(2) and SO_(2)` turns LIME WATER milky, as
`Ca(OH)_(2)(aq.)+CO_(2)tounderset(("milky"))(CaCO_(3))darr+H_(2)O`
`Ca(OH)_(2)+SO_(2)tounderset(("milky"))(CaSO_(3))darr+H_(2)O`
Discussion
35.

Mark the halogen which shows electropositive character:

Answer»

F
Cl
Br
I

Answer :D
Discussion
36.

Mark the element which shows only one oxidation state

Answer»

F <BR>CL
Br
I

ANSWER :A
Discussion
37.

Mark the correct statement (s). (1) Manganese exhibits +7 oxidation state (2) Zinc forms coloured ions (3)[CoF_(6)]^(3-) is diamagnetic (4) Sc forms +4 oxidation state (5) Zn exhibits only +2 oxidation state.

Answer»

1 and 2
1 and 5
2 and 4
3 and 4

Solution :Both these STATEMENTS are correct
Discussion
38.

Mark the correct statements out of the following

Answer»

He has highest `IE_(1)` in the periodic table.
CL has the highest EA out of all ELEMENTS in the periodic table.
Hg and Br are LIQUID at room temperature.
In any period, the atomic RADIUS of the NOBLE gas is lowest.

Answer :A::B::C
Discussion
39.

Mark the correct statements about halogens.

Answer»

Electron AFFINITY of halogens is in the order `F gt Clgt Brgt I`.
HF is the STRONGEST hydrohalic acid.
`F_(2)` has lower bond dissociation energy than `Cl_(2)`
All halogens show VARIABLE OXIDATION states.

Solution :`F_(2)` has lower bond dissociation energy than `Cl_(2)` due to its SMALL size which results in interelectronic repulsion.
Discussion
40.

Mark the correct statements out of the following:

Answer»

`He` and the highest `I.E_(1)` in the periodic table
`Cl` has the highest `E.A.` out of all the elements in the periodic table
`Hg` and `Br` are LIQUID at room temperature
In anyperiod, the ATOMIC radius of the NOBLE gas is lowest

Solution :Elements (a), (b) and (C) are correct. Statement (d) is incorrect as in any period, the atomic radius of the noble gas is largest.
Discussion
41.

Mark the correct statements(s) (1) Manganeses exhibits +7 oxidation state (2) Zinc forms coloured ions (3) [CoF_(6)]^(3-) is diamagnetic (4) Sc forms +4 oxidation state (5) Zn exhibits only +2 oxidation state

Answer»

(i) and (II)
(ii) and (IV)
(III) and (iv)
(i) and (V)

ANSWER :D
Discussion
42.

Mark the correct statements:

Answer»

Hg forms an AMALGAM with iron
Hg vapour is non-poisonous
Hg is MONO atomic and MONOVALENT in mercurous compound
Oxysalts of MERCURY are thermally unstable

Answer :D
Discussion
43.

Mark the correct statement about thiokol rubber .

Answer»

It is a SYNTHETIC POLYSULPHIDE RUBBER
It is OBTAINED by condensation of ethylene chloride with sodium tetrasulphide
It is resistant to oils and abrasion
All are CORRECT

Solution :Properties of thiokol rubber .
Discussion
44.

Mark the correctstatement

Answer»

METHYL AMINE isslightlyacidic
methyl amineisless basicthanammonia
methylamineis morebasicthanammonia
methyl amineformsaltwithalkalies

ANSWER :C
Discussion
45.

Mark the correct statement

Answer»

Methyl amine is slightly acidic
Methyl amine is LESS basic than `NH_(3)`
Methyl amine is stronger base than `NH_(3)`
Methyl amine FORMS salts with alkalies

Solution :Presence of ALKYL group INCREASE electron density on nitrogen atom due to +I effect. Thus basic nature increases.
Discussion
46.

Mark the correct relationship between the boiling points of very dilute solutions of BaCl_(2)(t_(1)) and LCl(t_(2)) ,having the same molarity

Answer»

`t_(1)=t_(2)`
`t_(1)gt t_(2)`
`t_(2)gt t_(1)`
`t_(2)` is approximately EQUAL to `t_(1)`

Solution :`BaCl_(2)` furnishes more ions than KCL and thus shows higher BOILING point `T_(1)gt T_(2)`.
Discussion
47.

Mark the compound which turns black with NH_(4)OH

Answer»

Lead chloride
Mercurous chloride
Mercuric chloride
Silver chloride

Solution :`Hg_(2)Cl_(2)+2NH_(2)OH to NH_(2)-Hg-CL+underset(("BLACK ppt"))(Hg)`
Discussion
48.

Mark the compound which turns black with NH_4 OH

Answer»

LEAD CHLORIDE
mercurous chloride
MERCURIC chloride
silver chloride

Solution :
Discussion
49.

Mark the axymmetric carbon atoms and give the number of optical isomers in the following compounds: (i) CH_(3)-(CHOH)_(2)-COOH (ii) HOCH_(2)-(CHOH)_(4)-CHO (iii) HOCH_(2)-(CHOH)_(4)-CH_(2)OH

Answer»

Solution :
the compound cannot be divided into equal HALVES and it consists of two ASYMMETRIC carbon atoms
Hence, the NUMBER of d- and il-(optically active ) isomers,
`a=2^(n)=2^(2)=4`
and Number of meso forms, m=0
So, Total optical isomers `=a+m-4+0=4`


Where, `n=4,a=2((4-1))-2^(3)=8,m=2^((4//2-1))=2^((2-1))=2`.
`r=(8)/(2)=4`
So, Total optical isomers =8+2=10
Discussion
50.

Mark the compound which gives carbon with conc. H_(2)SO_(4):

Answer»

formic acid
succinic acid
oxalic acid
SUGAR

Solution :`C_(12)H_(22)O_(11)overset("CON. "H_(2)SO_(4))to 12C+11H_(2)O`
Discussion