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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
The electrophile, `E^((o+))` attacks the benzene ring to generate the intermediate `sigma`-complex. Of the following which `sigma`-complex is of lowest energy?A. B. C. D. |
| Answer» Correct Answer - B | |
| 652. |
The surface of a metal illuminated with the light of `400 nm`. The kinetic energy of the ejected photoelectrons was found to be `1.68 eV`. The work function of the metal is : `(hc=1240 eV.nm)`A. `3.09 eV`B. `1.41 eV`C. `151eV`D. `1.68 eV` |
| Answer» Correct Answer - B | |
| 653. |
Two points P and Q are maintained at the potentials of 10V and -4V, respectively. The work done in moving 100 electrons from P to Q is:A. `-19 xx 10^(-17) J`B. `9.60 xx 10^(-17) J`C. `-2.24 xx 10^(-16) J`D. `2.24 xx 10^(-16) J` |
| Answer» Correct Answer - D | |
| 654. |
For the reaction : `N_(2(g))+3H_(2(g))hArr2NH_(3(g))`, `DeltaH=-ve`, the correct statement is :A. `DeltaH=DeltaU=0`B. `|DeltaH| lt |DeltaU|`C. `|DeltaH| gt |DeltaU|`D. `DeltaH = DeltaU ne 0` |
| Answer» Correct Answer - C | |
| 655. |
The number of different possible orders of matrices having 12 identical elements is: (A) 3 (B) 1 (C) 6 (D) none of these |
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Answer» (1,12),(2,6),(3,4(,(4,3),(6,2),(12,1) 6 different matrics. |
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| 656. |
Let ` A= [[5,5alpha,alpha],[0,alpha,5alpha],[0,0,5]]` .` If A^2 = 25,` then `alpha` equals to: |
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Answer» `|A|=(25alpha+0+0)-[0+0+0]=25alpha` `|A^2|=25` `25alpha*25alpha=25` `625alpha^2=25` `alpha^2=1/25` `alpha=pm1/5`. |
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| 657. |
The hydrocarbon, which can react with sodium in liquid ammonia isA. `CH_(3)CH_(2)CH_(2)C -= C CH_(2) CH_(2)CH_(3)`B. `CH_(3)CH_(2)C -= CH`C. `CH_(3)CH = CHCH_(3)`D. `CH_(3)CH_(2)C -= C CH_(2) CH_(3)` |
| Answer» Correct Answer - B | |
| 658. |
Gold numbers of protective colloids `A,B,C` and `D` are `0.5,0.01,0.10` and `0.005` respectivaly. The correct order of their protective power isA. `D lt A lt C lt B`B. `C lt B lt D lt A`C. `A lt C lt B lt D`D. `B lt D lt A lt C` |
| Answer» Correct Answer - C | |
| 659. |
Which type of linkage is present in amylopectin?A. `alpha-D` glucose, `C_(1)-C_(4)&C_(2)-C_(6)`B. `alpha-D` glucose, `C_(1)-C_(4)&C_(1)-C_(6)`C. `beta-D` glucose, `C_(1)-C_(4)&C_(2)-C_(6)`D. `beta-D` glucose, `C_(1)-C_(4)&C_(1)C_(6)` |
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Answer» Correct Answer - B |
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| 660. |
The vapour pressure of pure liquid `M & N` are `700mm` of `Hg` and `450mm` of `Hg` respectively. Which of the following option is correct ? Given : `X_(N),X_(M)=` mole fraction of `N & M` in liquid phase `Y_(N),Y_(M)=` mole fraction of `N & M` in vapour phaseA. `X_(M)-X_(N)gtY_(M)-Y_(N)`B. `(X_(M))/(X_(N))gt(Y_(M))/(Y_(N))`C. `(X_(M))/(X_(N))lt(Y_(M))/(Y_(N))`D. `(X_(M))/(X_(N))-(Y_(M))/(Y_(N))` |
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Answer» Correct Answer - C |
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| 661. |
A screw gauge with a pitch of 0.5 mm and a circular scale with 50 division is used to measure the thickness of a thin sheet of aluminium. Before starting the measurement, it is found that when the two jaws of the screw are brought in constant, 45th division coincides with the main scale line and that the zero of main scale line and that the zero of main scale is barely visible. What is the thickness of the sheet, if the main scale reading is 0.5 mm and 25th division coincides with the main scalel line ?A. `0.80` mmB. `0.70` mmC. `0.50` mmD. `0.75` mm |
| Answer» Correct Answer - A | |
| 662. |
A signal of frequency 20 kHz and peak voltage of 5 volt is used to modulate a carrier wave of frequency 1.2 MHz and peak voltage 25 volts. Choose the correct statement.A. Modulation index = 5, side frequency bands are at 1400 kHz and 1000 kHzB. Modulation index = 0.8, side frequency bands are at 1180 kHz and 1220 kHzC. Modulation index = 0.2, side frequency bands are at 1200 kHz and 1180 kHzD. Modulation index = 5, side frequency bands are at 21/2 kHz and 18.8 kHz |
| Answer» Correct Answer - C | |
| 663. |
Calcualte the enthalpy change on freezing of 1.0 mole of water at `10.0^(@)C` to ice at `-10^(@)`C. `Delta_(fs)H=6.03 kJ mol^(-1)` at `0^(@)C`. `C_(p)[H_(2)O(l)] = 75.3 J mol^(-1) K^(-1), C_(P)[H_(2)O(s)] = 36.8 Jmol^(-1)K^(-1)`A. `6.00 kJ "mol"^(-1)`B. `5.81 kJ "mol"^(-1)`C. `5.44 kJ "mol"^(-1)`D. `6.56 kJ "mol"^(-1)` |
| Answer» Correct Answer - D | |
| 664. |
If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution , the change in freezing point of water `(DeltaT_(f))` when `0.01` mole of sodium sulphate is dissociated in 1 kg of water is : (`K_(f) = 1.86` K kg `mol^(-1)`)A. 0.0372 KB. 0.0558 KC. 0.0744 KD. 0.0186 K |
| Answer» Correct Answer - B | |
| 665. |
For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point ?A. `[Co(H_(2)O)_(3) Cl_(3)].3H_(2)O`B. `[Co(H_(2)O)_(6)] Cl_(3)`C. `[Co(H_(2)O)_(5)Cl]Cl_(2).H_(2)O`D. `[Co(H_(2)O)_(4)Cl_(2)]Cl.H_(2)O` |
| Answer» Correct Answer - A | |
| 666. |
The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature isA. `-COOH, -SO_(3)H, -CONH_(2), -CHO`B. `-SO_(3)H, -COOH, -CONH_(2), -CHO`C. `-CHO, -COOH, -SO_(3)H, -CONH_(2)`D. `-CONH_(2), -CHO, -SO_(3)H, -COOH` |
| Answer» Correct Answer - B | |
| 667. |
Which of the following compounds is not yellow coloured ?A. `K_(3)[Co(NO_(2))_(6)]`B. `(NH_(4))_(3)["As"(Mo_(3)O_(10))_(4)]`C. `BaCrO_(4)`D. `Zn_(2)[Fe(CN)_(6)]` |
| Answer» Correct Answer - D | |
| 668. |
In Carius method of estimation of halogens `250 mg` of an organic compound gave `141 mg` of `AgBr`. The percentage of bromine in the compound is (atomic mass `Ag = 108, Br = 80`)A. 36B. 48C. 60D. 24 |
| Answer» Correct Answer - D | |
| 669. |
Which of the following compounds will exhibit geometrical isomerism?A. 3 - Phenyl - 1 - buteneB. 2 - Phenyl - 1 - buteneC. 1, 1 - Diphenyl - 1- propaneD. 1 - Phenyl - 2 - butene |
| Answer» Correct Answer - D | |
| 670. |
Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Ã…. The radius of sodium atom is approximately :A. 3.22 ÅB. 5.72 ÅC. 0.93 ÅD. 1.86 Å |
| Answer» Correct Answer - D | |
| 671. |
For gaseous state, if most probable speed is denoted by `C^(**)` average speed by `barC` and root square speed by `C`, then for a large number of molecules, the ratios of these speeds areA. `C^(**):barC:C=1.128 : 1. 225 : 1`B. `C^(**):barC:C=1:1. 128:1.225`C. `C^(**):barC:C=1:1.125:1.128`D. `C^(**):barC:C=1.225:1.128.1` |
| Answer» Correct Answer - B | |
| 672. |
lf `(3a)^log3= (4b)^log4` and `4^loga=3^logb` ,then a+b= |
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Answer» `(3a)^(log3)=(4b)^(log4)` `log[log(3a)]=log4[log(4b)]` `log3[log3+loga]+log4[log4+logb]-(1)` `4^(loga)=3^(logb)` `logalog4=logblog3` `loga=(logblog3)/(log4)-(2)` `log3[log3+(logblog3)/(log4)]=log4[log4+logb]` `(log3)^2[1+(logb)/(loga)]=log4[log4+logb]` `(log)^3(log4+logb)=(log4)^2[log4+logb]` `log4+logb=0` `b=1/4` `loga=(log(1/4)log3)/(log4)` `=(-log4log3)/(log4)` `a=1/3` `a+b=1/3+1/4=(4+3)/12=7/12`. |
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| 673. |
A uniform wire of resistance `=3Omega` and length `l` is stretched to double its length. Now it is bent to form a circular loop and two point `P & Q` lies on the loop such that they subtend `60^(@)` angle at centre. The equivalent resistance between two point P & Q is:A. `(5)/(3)Omega`B. `12Omega`C. `(3)/(5)Omega`D. `(1)/(12)Omega` |
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Answer» Correct Answer - A |
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| 674. |
When an electric current is passed through acidified water, `112ml` of `H_(2)` gas at `NTP` is collected at the cathode is `965` seconds. The current passed in amperes isA. 0.5B. 0.1C. 1D. 2 |
| Answer» Correct Answer - C | |
| 675. |
The percentage of p character of hybrid orbitals in graphite and diamond are respectivelyA. 33 and 25B. 33 and 75C. 67 and 75D. 67 and 75 |
| Answer» Correct Answer - C | |
| 676. |
The bond dissociation energy of `-F` in `BF_(3)` is `646 kJ mol^(-1)` whereas that of `C-F` in `CF_(4)` is `515kJ mol^(-1)`. The correct reason for higher `B-F` bond dissociation energy as compared to that of `C-F` isA. smaller size of B-atom as compared to that C -atomB. stronger `sigma` bond between B and F in `BF_(3)` as compared to that between C and F in `CF_(4)`C. significant `p pi - p pi` interaction between B and F in `BF_(3)` whereas there is no possibility of such interaction between C and F in `CF_(4)`D. lower degree of `p pi - p pi` interaction between B and F in `BF_(3)` than that between C and F in `CF_(4)` |
| Answer» Correct Answer - C | |
| 677. |
The hydrogen azide molecules has a bent geometery .The bond angle `H-N-N` isA. `{:("(I)",(II)),(gt2,lt2):}`B. `{:("(I)",(II)),(lt2,gt2):}`C. `{:("(I)",(II)),(gt2,gt2):}`D. `{:("(I)",(II)),(lt2,gt2):}` |
| Answer» Correct Answer - D | |
| 678. |
The decreasing order oof bond angles in `BF_(2), NH_(3), PF_(3)` and `I_(3)^(-)` is:A. `I_(3)^(-) gtNH_(3) gtPF_(3) gtBF_(3)`B. `BF_(3) gt I_(3)^(-)gt PF_(3) gt NH_(3)`C. `BF_(3) gt NH_(3) gtPF_(3) gt I_(3)^(-)`D. `I_(3)^(-) gt BF_(3) gtNH_(3) gt PF_(3)` |
| Answer» Correct Answer - D | |
| 679. |
Which one of the following constitutes a group of the isoelectronic species ?A. `C_(2)^(2-), O_(2)^(-), CO, NO`B. `NO^(+), C_(2)^(2-), CN^(-), N_(2)`C. `CN^(-), N_(2), O_(2)^(2-), C_(2)^(2-)`D. `N_(2), O_(2)^(-), NO^(+), CO` |
| Answer» Correct Answer - B | |
| 680. |
The temperature dependence of resistance of Cu and undoped Si in the temperature range `300 -400 K, ` is best described by :A. Linear increase for Cu, exponential increase for Si.B. Linear increase for Cu, exponential decrease for Si.C. Linear decrease for Cu, linear decrease for Si.D. Linear increase for Cu, linear increase for Si. |
| Answer» Correct Answer - B | |
| 681. |
Statement-1: The temperature dependence of resistance is usually given as `R=R_0(1+alphaDeltaT)`. The resistance of a wire changes from `100Omega to 150Omega` when its temperature is increased from `27^@C to 227^@C`. This implies that `alpha=2.5xx10^-3//^@C`. Statement 2: `R=R_0(1+alphaDeltaT)` is valid only when the change in the temperature `DeltaT` is small and `DeltaR=(R-R_0) lt ltR_0`.A. Statement-1 is true, Statement-2 is falseB. Statement-1 is true, Statement-2 is true, Statement-2 is the correct explaination of Statement-1C. Statement-1 is true, Statement-2 is true, Statement-2 is not the correct explanation of Statement-1D. Statement-1 is false, Statement-2 is true |
| Answer» Correct Answer - A | |
| 682. |
Which of the following lines correctly show the temperature dependence of equilibrium constant K, for an exothermic reaction? A. A and DB. A and BC. B and CD. C and D |
| Answer» Correct Answer - B | |
| 683. |
Which of the following are Lewis acids?A. `BCl_(3)` and `AICl_(3)`B. `PH_(3)` and `BCl_(3)`C. `AlCl_(3)` and `SiCl_(4)`D. `PH_(3)` and `SiCl_(4)` |
| Answer» Correct Answer - A::C | |
| 684. |
In aqueous solution the ionization constants for carbonic acid are: `K_(1)=4.2xx10^(-7)and K_(2)=4.8xx10^(-11)` Select the correct statement for a saturated `0.034M` solution of the carbonic acid.A. The concentration of `CO_(3)^(2-)` is 0.034 M.B. The cocentration of `CO_(3)^(-)` is greater than that of `HCO_(3)^(-).`C. The concentration of `H^(+)` and `HCO_(3)^(-)` are approximately equal.D. The concentration of `H^(+)` is double that of `CO_(3)^(2-)`. |
| Answer» Correct Answer - C | |
| 685. |
A long solenoid of radius R carries a time dependent current `I = I_(0) t(1 – t)`. A ring of radius 2R is placed coaxially near its centre. During the time interval`0 le t le 1`, the induced current `I_(R)` and the induced emf VR in the ring vary as:A. current will change its direction and its emf will be zero at t = 0.25sec.B. current will not change its direction & emf will be maximum at t = 0.5secC. current will not change direction and emf will be zero at 0.25sec.D. current will change its direction and its emf will be zero at t = 0.5sec. |
| Answer» Correct Answer - D | |
| 686. |
Moment of inertia of an equilateral triangular lamina ABC, about the axis passing through its centre O and perpendicular to its plane is `I_(0)` as shown in the figure. A cavithy DEF is cut out from the lamina, where D,E,F are the mid points of the sides. Moment of inertia of the remaining part of lamina about the same axis is - A. `(15)/(16)I_(0)`B. `(3I_(0))/(4)`C. `(7)/(8)I_(0)`D. `(31I_(0))/(32)` |
| Answer» Correct Answer - A | |
| 687. |
In the circuit diagram of zener diode as shown in figure, when the value of `V_(0)` is `8` volt, the current through zener diode is `i_(1)` and when `V_(0)` is `16` volt, the corresponding current is `i_(2)`. Find the value of `(i_(2)-i_(1))`. (Zener breakdown voltage `V_(2)=6V)` A. ZeroB. `5.0mA`C. `1.5mA`D. `8 mA` |
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Answer» Correct Answer - D |
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| 688. |
An aqueous solution contains `0.10 M H_(2)S` and 0.20 M HCl. If the equilibrium constants for the formation of `HS^(–)` from `H_(2)S` is `1.0xx10^(–7)` and that of `S^(2-)` from `HS^(–)` ions is `1.2xx10^(–13)` then the concentration of `S^(2-)` ions in aqueous solution isA. `5xx10^(-19)`B. `5xx10^(-8)`C. `3xx10^(-20)`D. `6xx10^(-21)` |
| Answer» Correct Answer - C | |
| 689. |
Total number of lone pair of electrons in 3 `I_(3)^(-)` ion isA. 12B. 3C. 6D. 9 |
| Answer» Correct Answer - D | |
| 690. |
The compound that does not produce nitrogen gas by the thermal decomposition isA. `(NH_(4))_(2).SO_(4)`B. `Ba(N_(3))_(2)`C. `(NH_(4))_(2)Cr_(2)O_(7)`D. `NH_(4)NO_(2)` |
| Answer» Correct Answer - A | |
| 691. |
Which of the following salts is the most basic in aqueous solution?A. `Pb(CH_(3)COO)_(2)`B. `Al(CN)_(3)`C. `CH_(3)COOK`D. `FeCl_(3)` |
| Answer» Correct Answer - C | |
| 692. |
In the hofmann-bromamide degradation reaction, the number of moles of NaOH and `Br_(2)` used per mole of amine produced areA. Four moles of NaOH and two moles of `Br_(2)`.B. Two moles of NaOH and two moles of `Br_(2)`.C. Four moles of NaOH and one mole of `Br_(2)`.D. One mole of NaOH and one mole of `Br_(2)`. |
| Answer» Correct Answer - C | |
| 693. |
Consider the following reaction and statements: `[Co(NH_(3))_(4)Br_(2)]^(+)+Br^(-) to [Co(NH_(3))_(3)Br_(3)]+NH_(3)` Two isomers are produced if the reactant complex ion is a cis-isomer Two isomers are produced if the reactant complex ion is a trans-isomer Only one isomer is produced if the reactant complex ion is a trans-isomer Only one isomer is produced if the reactant complex ion is a cis – isomer The correct statements areA. (II) and (IV)B. (I) and (II)C. (I) and (III)D. (III) and (IV) |
| Answer» Correct Answer - C | |
| 694. |
How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane? (Atomic weight of B = 10.8 u)A. 1.6 hoursB. 6.4 hoursC. 0.8 hoursD. 3.2 hours |
| Answer» Correct Answer - D | |
| 695. |
If the source of power` 4 kW` product`10^(20)` photons //second , the radiation belongs to a part spectrum calledA. X-raysB. ultraviolet raysC. microwavesD. `gamma`rays |
| Answer» Correct Answer - A | |
| 696. |
The maximum kinetic energy of electron if wavelenght of incident electromagnetic wave is `260 nm` and cut-off wvelenght is `380 nm` given `hc-1237nm-eV` isA. `1.5eV`B. `6.4eV`C. `10eV`D. `None of these |
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Answer» Correct Answer - A |
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| 697. |
The moment of inertia of a rigid body is `1.5 kgxxm//s^(2)` and its initial angular velocity is zero. It start rotating with uniform angular acceleration `alpha=20rad//sec^(2))` to achieve a rotational `KE=1200J` find the time requried for this:A. 20 secB. 200 secC. 2 secD. 0.2 sec |
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Answer» Correct Answer - C |
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| 698. |
A particle start from rest, with uniform acceleration at time `t`, choose the correct optionA. B. C. D. |
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Answer» Correct Answer - C |
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| 699. |
The reading of the ammeter for a silicon diode in the given circuit is : A. `13.5" mA"`B. 0C. 15 mAD. `11.5" mA"` |
| Answer» Correct Answer - D | |
| 700. |
If potential gradient on wire `PQ` is `0.01 V//m` then the reading of voltmeter is : A. `3mV`B. `5mV`C. `7mV`D. `9mV` |
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Answer» Correct Answer - B |
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