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.

Which of the following is the graph between the frequency (v) of the incident radiations and the stopping potential ?

Answer»




ANSWER :C
Discussion
2.

To make pastries like edible food light and porous ......... is added to it.

Answer»

`NaHCO_(3)`
`Na_(2)CO_(3)`
`Na_(2)CO_(3)*10H_(2)O`
`KHCO_(3)`

ANSWER :A
Discussion
3.

What is not correct at normal temperature and pressure ?

Answer»

`P_4O_10` is a WHITE solid
`SO_2`is a colorless gas
`SO_3` is a colorless gas
`NO_2` is a brown COLORED gas

ANSWER :C
Discussion
4.

Which of the following compounds is used to remove water hardens

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`Ca_(3)(PO_(4))_(2)`
`Na_(3)PO_(4)`
`Na_(6)P_(6)O_(18)`
`Na_(2)HPO_(4)`

Solution :`Na_(6)P_(6)O_(18)` (sodium METAPHOSPHATE) known as calgon is used for water softening
Discussion
5.

Which one of the folowing has highest bond order? N_(2),N_(2)^(+)orN_(2)^(-) ?

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Solution :Bond ORDER=`3,B.O=(N_(b)-N_(a))/(2)=(10-4)/(2)=3`
`N_(2)^(+)` (13 electrons)
Bond order=`2.5,B.O=(N_(b)-N_(a))/(2)=(9-4)/(2)=2.5`
`N_(2)^(-)` (15 electrons)
Bond order=`2.5,B.O=(N_(b)-N_(a))/(2)=(10-5)/(2)=2.5`
So`N_(2)` has the HIGHEST bond order.
Discussion
6.

Which is not responsible for environmental pollution

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INDUSTRIALISATION
DEFORESTATION
Increase in POPULATION
Photosynthesis

Answer :D
Discussion
7.

Which of the following compounds is efflorescent ?

Answer»

A. `Na_2CO_3`
B.`Na_2CO_3 . 10H_2O`
C.`Na_2CO_3 . H_2O`
D.`NaHCO_3`

SOLUTION :`Na_2CO_3 . 10H_2O`
Discussion
8.

Which of the following is incorrect relation

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ANSWER :B
Discussion
9.

the total number of possible alkenes in this elimination reaction is :

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ANSWER :C
Discussion
10.

What is the de Broglie wavelength (in cum) of a 160g cricket ball travelling at 140 Km hr^(-1).

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Solution :160g=.0.16kg.
v=velocity of the criket ball=`140Km HR^(-10)`
`=(140xx5)/(18)=38.88ms^(-1)`
de Broglie equation=gamma=`h/(MV)`
h=planck.s constant=`6.626xx10^(34)kgm^(2)s^(-1)`
de Broglie wavelength `=6.626xx10^(-34)cancel(kg m^(2) s^(-1))/(cancel(0.16kgxx38.88)cancel(ms^(-1)))`
`gamma=6.626xx(10^(-34))/(6.2208)`
`gamma=1.065xx10^(-34)m`
wavelength in cum`=1.065xx10^(-34)XX100`
`=1.065xx10^(32)cm(or) 1.065xx10^(-34)m`
Discussion
11.

Which of the following is not a general characteristic of equilibria involving physical processes?

Answer»

EQUILIBRIUM is POSSIBLE only in a close system at a given temperature
All measurable properties of the system REMAIN constant
All the PHYSICAL processes stop at equilibrium
The opposing processes occur at the same rate and there is dynamic but stable condition

Solution :All the physical processes stop at equilibrium
Discussion
12.

Which product is given by sulphur trioxide on dissolution in to a sulphuric acid ?

Answer»

`H_2SO_3`
`H_2SO_5`
`H_2S_2O_7`
`H_2S_2O_8`

ANSWER :C
Discussion
13.

Which of the following compounds are not arranged in correct order as indicated?

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`SrCL_(2) lt CaCl_(2) lt MgCl_(2) lt BeCl_(2)` (INCREASING of HYDROLYSIS)
`SrCl_(2)lt CaCl_(2) lt MgCl_(2) lt BeCl_(2) ` (increasing lattice energy)
`CaSO_(4) lt MgSO_(4) lt BeSO_(4)` (increasing STABILITY)
`Be(OH)_(2) lt Mg(OH)_(2) lt Ca(OH)_(2)` (increasing solubility)

Answer :C
Discussion
14.

Which molecules represented by the bold atoms show their highest oxidation state?

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`F_2ulO`
`H_(2)ulS`
`ulPH_3`
`UL(N_2)H_4`

Solution :The LOWEST oxidation state is given by (gp.number -8 ) EXCEPT METALS.
Discussion
15.

Which one of the following is positively charged electrophiles?

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`CO_2`
`AlCl_3`
`BF_3`
`RX`

SOLUTION :RX
Discussion
16.

The value of n in the molecular formula Be_(n)I_(2)Si_(6)O_(18 is

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Solution :Since netcharge on the neutral molecule is zero therefore for the given molecule `Be_(N)"AII"_(2)Si_(6)O_(18)`
`n(+2)+2(+3)+6(+4)+18(-2)=0`
or 2n+6+24-36=0 or 2n=6
n=3
Discussion
17.

What is the half life of Fr?

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21 minute
21 Seconds
2.1 minute
12 minute

Answer :A
Discussion
18.

Write the conditions which proves exceptional stability of bezene.

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Solution :The following conditions proves the excepetional stability of BENZENE.
(i) Benzene resist the addition reaction with respect to ALKENE.
(ii) Although having LESS amount of `PI` -bond and Hydrogen atom, benzene easily gives substitution reaction.
(iii) Benzene possess neither 154 pm length for C-C single bond length nor 133 pm length for C=C but it possess 139 pm intermediate bond length.
(iv) Benzene has least hydrogenation ENTHALPY, only `36 K Cal mol^(-1)` respect to cyclohexatriene. Resonance energy of benzene is `36 K cal mol^(-1)`.
(v) Benzene is stable due to its aromatic character.
Discussion
19.

Which one of the following does not have sp^(2) hybridized carbon ?

Answer»

Acetone
Acetic ACID
Acetonitrile
ACETAMIDE

Solution :`underset("Acetone")(overset(sp^(3))(CH_(3))-overset(sp^(2))(CO)-CH_(3))"",""underset("Acetic Acid")(overset(sp^(3))(CH_(3))-overset(sp^(2))(C)OOH)`
`underset("Acetonitrile")(overset(sp^(3))(CH_(3))-overset(sp)(C)-=)N,""underset("Acetamide")(overset(sp^(3))(CH_(3))-overset(sp^(2))(C)ONH_(2))`
Discussion
20.

Which of the following represents the given sequence of hybridisation of carbon atoms from left to right sp^(2),sp^(2),sp,sp?

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`CH -= C - C -= CH`
`CH_2 = CH - C -= CH`
`CH_2 = CH - CH = CH_2`
`CH_3 - CH = CH - CH_3`

ANSWER :B
Discussion
21.

What effect does branching of an alkane chain has on its melting point?

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Solution :As branching increases AMONG isomeric alkanes, BOILING point decreases. As branching increases, the molecule attains the shape of a sphere. This decreases the surface AREA and RESULTS in weaker VAN der Waal's forces. This reduce the boiling poin.
Discussion
22.

Which expression gives the fraction by mass of nitrogen in ammonium dihydrogen phosphate?

Answer»

`(11/115)`
`(28/(115)`
`(28/132)`
`(28/133)`

ANSWER :A
Discussion
23.

'X' overset(Ag//Delta)to 'Y' where if 'Y' is ethyne, X is.

Answer»

`CH_3Cl`
`CH_2Cl_2`
`CHCl_3`
`C Cl_4`

SOLUTION :
Discussion
24.

What type of defect can arise when a solid is heated ? Which physical property is affected by it and in what way?

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Solution :When a solid is heated, vacancy defect is produced in the CRYSTAL. This is because on HEATING, some atoms or ions leave the lattice SITE completely, ie, some lattice sites become vacant As a result of this defect, the density of the substance DECREASES because some atoms/ions leave the crystal completely
Discussion
25.

Which of the following ion is paramagnetic

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`LA^(3+)(Z=57)`
`Lu^(3+)(Z=71)`
`Yb^(2+)(Z=70)`
`SM^(3+)(Z=62)`

ANSWER :D
Discussion
26.

Which of the following has maximum number of hyper conjugative structures?

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ISOPROPYL CARBONIUM ION
Tertiary butyl carbonium ion
n-propyl carbonium
Benzyl carbonium ion

Solution :Among the given the hyper conjugative structures are more for `3^(@)`-butyl carbonium ion due to `3-alpha-C` & `9-alpha-H` atoms.
Discussion
27.

What will be the heat change at constant volume for the reaction whose heat change at constant pressure is -560 kcal at 27^(@)C? The reaction is C_(8)H_(16) + 12O_(2) to 8CO_(2) + 8H_(2)O (Given R = 2 cal mol^(-1)K^(-1))

Answer»

`-557600` calories
`442800` calories
`-561800` calories
`368240` calories

Solution :`DeltaH = -560 kcal, DELTAU = ?`
`C_(8)H_(16)(l) + 12O_(2)(g) to 8CO_(2)(g) + 8H_(2)O(l)`
`DeltaH = DeltaU + Deltan_(g) RT`
`Deltan_(g) = 8 -12 = -4`
`-560000 = DeltaU + (-4) xx 2 xx 300`
= `-557600`.
Discussion
28.

Using stock notation represent HAuCI_(4).

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Solution :The oxidation NUMBER of the metallic element Au in `HAuCl_(4)` is `+3`. HENCE, the COMPOUND is represented as `HAU(III)Cl_(4)`
Discussion
29.

Which of the following compound(s) fail in Friedel-Crafts alkylation reaction?

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Solution :Friedel-craft alkylation, in general, a very slow REACTION, fail to occur at STRONGLY deactivated ring like nitrobenzene. In case of aniline. LEWIS acid REACTS with `-NH_2` forming a salt which is HIGHLY deactivated.
Discussion
30.

What are diathermic and adiabaticcontainers?

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Solution :The CONTAINERS that permit exchange of energy with the SURROUNDINGS are called DIATHERMIC while those which do not allow are called ADIABATIC.
Discussion
31.

Which of the following molecules is least resonance stabilised ?

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Solution :Aromatic COMPOUNDS are RESONANCE STABILISED. ALTHOUGH compound (b) is also resonance stabilized but it less resonance stabilized than aromatic compounds.
Discussion
32.

Which one has highest pH from the following ?

Answer»

`NaNO_3`
`CH_3COOK`
`NH_4Cl`
`Na_2CO_3`

SOLUTION :
`Na_2CO_3` is comperatively most BASIC . The POH of `Na_2CO_3` is MINIMUM and `p^H` is MAXIMUM.
Discussion
33.

What type of compounds are purified by sublimation ?

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Solution :Substances whose vapour PRESSURE become EQUAL to the atmospheric pressure much below their melting points. For EXAMPLE, NAPHTHALENE, benzoic ACID, camphor, iodine, etc.
Discussion
34.

What is meant bythe conjugate acid-base pair ? Find the conjugate acid/base for the secies : HNO_(2), CN^(-), HClO_(4),F^(-),OH^(-),CO_(3)^(2-) and S^(2-)

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SOLUTION :An acid-BASE pair which differ by a proton is calledconjugate acid base pair .
`NO_(2)^(-), HCN, ClO_(4)^(-) , HF, H_(2)O ` (acid) or `O^(2-) ` (base), `HCO_(3)^(-) and HS^(-)`.
Discussion
35.

Which of the following represent correct product formation.

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SOLUTION :is FORMED DUE to RING EXPANSION.
Discussion
36.

Three different gases x, y, z of molecular masses 2, 16 and 64 were enclosed in a vessel at a constant temperature is correct

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Gas `z` will be at the top of the vessel
Gas `y` will be at the bottom and x will be at the top
Gas `x` will be at the bottom and y will be at the top
Gases will form a homogeneous mixture

Solution :As the VOLUME of the bubble at the SURFACE BECOMES 8 times, PRESSURE at the bottom of the lake is 8 times the pressure at the surface. As pressure on the surface = 1 atm, pressure at the bottom = 8 atm.
Thus, pressure due to the depth of the lake = 7 atm = 70 m of water.
Discussion
37.

Which of the following hydids are generally nonstoichiometric in nature

Answer»

IONIC hydrogen
Molecular HYDRIDES
INTERSTITIAL hydrides
All of these

Solution :Interstitial Hydrides are NON- stoichiousetric
Discussion
38.

Whichof the following species have same shape/same bond order ? N_(3)^(-) , NO_(2)^(-), CO_(2), O_(3)

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SOLUTION :Isoelectonic species have same shape/same BOND order. The NUMBER of OUTER electrons is same in `CO_(2)`
and ` N_(3)^(-)`and same in `O_(3) and NO_(2)^(-)`.
Discussion
39.

Which of the following is NOT a postulate of the kinetic molecular theory of gases ?

Answer»

The MOLECULES possess a volume that is negligibly samll compared o the container 
The pressue and volume of a gas are inversely related 
Gases consist of DISCRETE particles that are in constant chaotic MOTION 
The average kinetic energy of the molecules is DIRECTLY proportional to the temperature.

Solution :Kinetic THEORY does not relate P,V.
Discussion
40.

The total number of cyclic isomers possible for a hydrocarbon with the molecular formula C_(4)H_6 is

Answer»

2
5
6
8

Answer :B
Discussion
41.

Which one of the following statements is incorrect in the case of Heterogenous catalysis

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The CATALYST LOWERS the energy of activation
The catalyst ACTUALLY FORMS a intermediate COMPOUND with the reactant
The surface of the catalyst plays a very important role
There is no change in the energy of activation

Answer :D
Discussion
42.

Which compound is formed when calcium carbide reacts with heavy water?

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`C_(2)D_(2)`
`CaD_(2)`
`CD_(2)`
`Ca_(2)D_(2)`

Solution :`CaC_(2)+2D_(2)O to C_(2)D_(2)+Ca(OD)_(2)`
Discussion
43.

When rain is accompanied by a thunderstorm, the collected rain water will have pH value

Answer»

slightlyhiger than thatwhen thethunder stormis not there
uninfluenced by thethunder storm
which depends on the amount of DUST in air
slightly LOWER than that of RAIN water without thunder storm

Answer :A::C::D
Discussion
44.

Units of K_c for xA_((g)) harr yB_((g)) is lit^2-mol^(-2), then the values of x & y cannot be

Answer»

1,2
3,2
2,3
All

Solution :`K_(c)=("MOLE" // "LIT")^(Delta n_(g))`
Discussion
45.

When washing soda is heated

Answer»

`CO` is RELEASED
`CO+CO_(2)` is released
`CO_(2)` is released
water VAPOUR is released

Answer :D
Discussion
46.

Which oxide cannot be reduced by H_(2)?

Answer»

`Al_2O_3`
`CUO`
`ZNO`
All of these

Solution :ALKALI and Alkaine EARTH METALS are not reduced by `H_2` due to high electro positivity.
Discussion
47.

Which of the following volume (V)-temperature (T) plotsrepresents the behaviour of one mole of an ideal gas at one atmospheric pressure ?

Answer»




Solution :VOLUME of 1 MOLE of an ideal GAS at 273 K and atm is 22.4 L. Volume at 373 K and 1 atm pressure
`V=(RT)/(P)=(0.082xx373)/(1)=30.58" L"~~30.6" L"`
Discussion
48.

Which of the following reaction do you think will result in the absorption of heat ?

Answer»

CARBON burning in air
IRON reacting with sulphur to form iron SULPHIDE
Formation of water GAS from steam and COKE
Formation of producer gas

Answer :C
Discussion
49.

Which of the following is more stable

Answer»

`PB^(4+)`
`Sn^(4+)`
`Ge^(4+)`
`Ge^(2+)`

Solution :Highest oxidation STATE more stable in top of the group due to LESS inert pair effect
Discussion
50.

Which form of based on physical characteristics posses neither definite volume nor definite shape ?

Answer»

SOLIDS
Liquids
Gases
Both (a) and (B)

ANSWER :A
Discussion