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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 not correct regarding the diagonal relationship between `Al` and `Be`A. Oxides of both are amphoteric in natureB. Carbides of both produce same gas an hydrolysisC. Hydrides of both are electron deficient covalent compoundsD. Both show `+2` oxidation states in their compounds |
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Answer» Correct Answer - D Aluminium is trivalent & `Be` is divalent |
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| 2. |
The final product obtained from the electrolysis of `50% H_(2)SO_(4)` with high current density has:A. `S-O-O-S` linkageB. `S=S` linkageC. `S-S` linkageD. `S-O-S` linkage |
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Answer» Correct Answer - A `H_(2)SO_(4)` on electrolysis froms `H_(2)S_(2)O_(8)` `H-O-underset(O)underset(||)overset(O)overset(||)S-O-O-underset(O)underset(||)overset(O)overset(||)S-O-H` |
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| 3. |
The gradual decrease in atomic radius for lanthanoids element in not obeyed byA. `Eu` onlyB. `Yb` onlyC. Both `Eu` & `Yb`D. None of these |
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Answer» Correct Answer - C Atomic radii increases for `Eu` & `4b` in lanthanoids series. |
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| 4. |
`CdO` has `NaCl` like structure with density `8.27g//c c`. If the ionic radius of `O^(2-)` is `1.24A^(@)` determine the ionic radius of `Cd^(2+)`:A. `1.5 A^(@)`B. `1.1 A^(@)`C. `1.9 A^(@)`D. `1.5 A^(@)` |
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Answer» Correct Answer - B `rho = (Z xx M)/(N_(A) xx alpha^(3)) rArr alpha = (r_(Cd^(2)) + r_(O^(2-)))` |
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| 5. |
Fixed mass of an ideal gas collected in a 24.64 litre sealed rigid vessel at 10 atm is heated from `-73^(@)C` to `27^(@)C` calculate change in gibbs free energy if entropy of gas is a function of temperature as `S=2+10^(-2)T(J//K)(1l atm=0.1kJ)`A. `123.5J`B. `1281.5J`C. `781.5J`D. 0 |
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Answer» Correct Answer - C At constant volume `(p_(1))/(T_(1)) = (p_(2))/(T_(2)) rArr p_(2) = p_(1) (T_(2))/(T_(1)) = (3)/(2)` `rArr dG = V dp - S dT` `= V deltap- underset(200k)overset(300k)int 2 + 10^(-T) T dT` |
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| 6. |
The dissociation constant of n-butyric acid is `1.6 xx 10^(-5)` and the molar conductivity at infinite dilution is `380 xx 10^(-4) Sm^(2) mol^(-1)`. The specific conductance of the `0.01M` acid solution isA. `1.52 xx 10^(-5) S`B. `1.52 S`C. `1.52 xx 10^(-3) S`D. `1.52 xx10^(-4) S` |
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Answer» Correct Answer - B `alpha = sqrt(K_(alpha))/(C ) = sqrt(1.6 xx10^(-5))/(0.01)` `lambda_(m) = alphal lambda_(m)^(@) = (K xx 1000)/("molarity")` when `lambda_(m)` is in `S cm^(2)mol^(-1)` `G = (K)/("cell constant")` |
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| 7. |
Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO_(4).5H_(2)O)`, atacanite `[Cu_(2)Cl(OH)_(3)]`, cuprite `(Cu_(2)O)`, copper glance `(Cu_(2)S)`, and malachite `[Cu_(2)(OH)_(2)CO_(3)]`. However, `80 %` of the world copper production comes from the ore chalcopyrite `(CuFeS_(2))`. The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. Iron is removed from chalcopyrite as.A. `FeO`B. `FeS`C. `Fe_(2) O_(3)`D. `FeSiO_(3)` |
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Answer» Correct Answer - D The partically roasted ore is mixed with silica and little coke and then is heated in a blast furance when `FeO`, which is present as impurity is removed as ferrous silicate slag. `FeO SiO_(2) rarr FeSiO_(3) darr`. |
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| 8. |
Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO_(4).5H_(2)O)`, atacanite `[Cu_(2)Cl(OH)_(3)]`, cuprite `(Cu_(2)O)`, copper glance `(Cu_(2)S)`, and malachite `[Cu_(2)(OH)_(2)CO_(3)]`. However, `80 %` of the world copper production comes from the ore chalcopyrite `(CuFeS_(2))`. The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. Partial roasting of chalcopyrite producesA. `Cu_(2) S` and `FeO`B. `Cu_(2) O` and `FeO`C. `Cu_(2) O` and `Fe_(2) O_(3)`D. `CuS` and `Fe_(2) O_(3)`. |
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Answer» Correct Answer - A During partial roasting, `CuFeS_(2)` is first converted to `Cu_(2)S` and `FeS`. Further, as iron is more reactive than copper, `FeS` is preferentially oxidised to `FeO`. This partial roasting of chalcopyrite produces `Cu_(2)S` and `FeO`. `CuFeS_(2) + O_(2) overset (Delta)rarr Cu_(2)S + 2FeS + So_(2)` `2FeS + O_(2) overset (Delta)rarr Cu_(2)S + 2FeS + SO_(2)`. |
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| 9. |
Which of the following is not a mineral of iron?A. MagnetiteB. SideriteC. SmithsoniteD. Limonite |
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Answer» Correct Answer - C Magnetite `(Fe_(3)O_(4))` Siderite `(FeCO_(3))`, Limonite `(Fe_(2)O_(3).3H_(2)O)` and Haematite `(Fe_(2)O_(3))` are ores of Iron. Only Smithsonite is not an ore of Iron. |
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| 10. |
Corundum is an ore of aluminium.A. CopperB. BoronC. AluminiumD. Sodium |
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Answer» Correct Answer - C Corundum `(Ag_(2)C1)` is an ore of `A1`. |
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| 11. |
Magnetic separation is used for increasing concentration of the followingA. Horn silverB. CalciteC. HaematiteD. Magnesite |
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Answer» Correct Answer - C Haemitite `(Fe_(2)O_(2))` |
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| 12. |
Explain why can alkali and alkaline earth metals not be obtained by chemical reduction methods? |
| Answer» Alkali and alkaline earth metals are themselves strong reducing agents better than them are not available. Therefore, These metals cannot be obtained by reaction of their oxides or chlorides. | |
| 13. |
if `|{:(a^(2)+lamda^(2),ab+clamda,ca-blamda),(ab-clamda,b^(2)+lamda^(2),bc+alamda),(ca+blamda,-bc+alamda,c^(2)+lamda^(2)):}||{:(lamda,c,-b),(-c,lamda,a),(b,-a,lamda):}|=(1+a^(2)+b^(2)+c^(2))^(3)`, then find the value of `lamda` |
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Answer» Correct Answer - A We observe that the elements in the prefactor are the confactors of the correspoinding elements of the post factor. Hence, `L.H.S=|{:(lamda,c,-b),(-c,lamda,a),(b,-a,lamda):}|^(3)=[lamda(lamda^(2)+a^(2)+b^(2)+c^(2))]^(3)=(1+a^(2)+b^(2)+c^(2))^(3)implieslamda=1` |
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| 14. |
If `|(a^(2)+lamda^(2),ab+clamda,ca-blamda),(ab-clamda,b^(2)+lamda^(2),bc+alamda),(ca+blamda,-bc+alamda, c^(2)+lamda^(2))||(lamda,c,-b),(-c,lamda,a),(b,-a,lamda)|=(1+a^(2)+b^(2)+c^(2))^(3)`, then find the value of `lamda`. |
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Answer» Correct Answer - 1 We observe that the elements in the prefactor are the cofactors of the corresponding elements of the post factor. Hence L.H.S. `=|(lamda, c, -b),(-c, lamda, a),(b, -a, lamda)|^(3)=[lamda(lamda^(2)+a^(2)+b^(2)+c^(2))]^(3)=(1+a^(2)+b^(2)+c^(2))^(2)implieslamda=1` |
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| 15. |
If `DeltaABC,` if `(c+a)/12=(a+b)/14=(b+c)/18`, then find vaue of `(7r_(1)-r_(2))/(11r)` is |
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Answer» `(c+a)/(12)=(a+b)/(14)=(b+c)/(18)=(s)/(11)` `b+c=(18)/(11)s` `implies2s-a=(18)/(11)s` `impliess-a=(7)/(11)s` `r_(1)=(Delta)/(s-a)=(11Delta)/(7s)=(11)/(7)r` `a+c=(12s)/(11)` `2s-b=(12s)/(11)` `r_(r)=(Delta)/(s-b)=(11Delta)/(s)=11r` `implies(7r_(1)-r_(2))/(11)=(11r-11r)/(11r)=0` |
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| 16. |
In a period, density first ___then_____and in a group it_down the groupA. Decreases, increases, remains constantB. Increases, decreases, decreasesC. Increases, remaina constant , increasesD. Increases, decreases, increases |
| Answer» Correct Answer - D | |
| 17. |
Extent of hydrolysis of the following isA. `PCl_(5) gt SiCl_(4) gt MgCl_(2) gt AlCl_(3)`B. `AlCl_(3) gt MgCl_(2) gt SiCl_(4) gt PCl_(5)`C. `SiCl_(4) gt PCl_(5) gt MgCl_(2) gt AlCl_(3)`D. `PCl_(5) gt SiCl_(4) gt AlCl_(3) gt MgCl_(2)` |
| Answer» Correct Answer - D | |
| 18. |
Which of the following is incorrect?A. An element which has high electronegativity always has high electron gain enthalpy.B. Electron gain enthalpy is the property of an isolated atom.C. Electronegativity is the property of bonded atom.D. Both electronegativity and electron gain enthalpy are usually directly related to nuclear charge and inversely related to atomic size. |
| Answer» Correct Answer - A | |
| 19. |
Give the decreasing order of thermal stability of the following .A. `BeCO_(3) gt MgCO_(3) gt CaCO_(3) gt BaCO_(3)`B. `BaCO_(3) gt CaCO_(3) gt MgCO_(3) gt BeCO_(3)`C. `BaCO_(3) gt CaCO_(3) gt BaCO_(3) gt MgCO_(3)`D. `MgCO_(3) gt CaCO_(3) gt BaCO_(3) gt BeCO_(3)` |
| Answer» Correct Answer - B | |
| 20. |
Which of the following is incorrect ?A. With increase in atomic size, ionisation energy increasesB. With increase in atomic size, electron affinity increasesC. With increase in atomic size, metallic character increasesD. With increase in atomic size, electronegativity increases |
| Answer» Correct Answer - C | |
| 21. |
Lattice energy of an ionic compound depedns upon :A. Change density of the ions onlyB. Packing of ions onlyC. Size of the ion onlyD. Charge on the ions only |
| Answer» Correct Answer - A | |
| 22. |
The ratio of kinetic energy and potential energy of an electron in a Bohr orbit of a hydrogen`-` like species is `:`A. `1//2`B. `-1//2`C. 1D. `-1` |
| Answer» Correct Answer - 2 | |
| 23. |
Identify the pair of enantiomers amongst the given pairs `:`A. B. C. D. |
| Answer» Correct Answer - 2 | |
| 24. |
For Dancing Resonace, stability of Free radical is detected by presence ofA. more no. Of isopropyl ringB. less no. Of isopropyl ringC. more no. Of isopropyl chainD. less no. Of isopropyl chain |
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Answer» Correct Answer - A |
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| 25. |
Calculate the [H3O+] of blood, the pH of which is 7.2 (slightly basic). (A) 5 × 10–8 M (B) 6.3 × 10–8 M (C) 5 × 10–9 M (D) 4 × 10–7 M |
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Answer» Correct option: (B) 6.3 × 10–8 M Explanation: As pH = 7.2 so [H3O+] = antilog (–7.2) = 6.3 × 10–8 M |
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| 26. |
An electron volt is : A. the force acting on an electron in a field of 1 N/C B. the force required to move an electron 1 meter C. the energy gained by an electron in moving through a potential difference of 1 volt D. the energy needed to move an electron through 1 meter in any electric field E. the work done when 1 coulomb of charge is moved through a potential difference of 1 volt. |
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Answer» C. the energy gained by an electron in moving through a potential difference of 1 volt |
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| 27. |
Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs: A. at the center B. at the surface C. halfway between the center and surface D. just outside the surface E. far from the sphere |
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Answer» A. at the center |
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| 28. |
The equipotential surfaces associated with a charged point particles are: A. radially outward from the particleB. vertical planes C. horizontal planes D. concentric spheres centered at the particle E. concentric cylinders with the particle on the axis. |
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Answer» D. concentric spheres centered at the particle |
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| 29. |
In a certain region of space the electric potential increases uniformly from east to west and does not vary in any other direction. The electric field: A. points east and varies with position B. points east and does not vary with position C. points west and varies with position D. points west and does not vary with position E. points north and does not vary with position |
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Answer» B. points east and does not vary with position |
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| 30. |
A particle with charge q is to be brought from far away to a point near an electric dipole. No work is done if the final position of the particle is on: A. the line through the charges of the dipole B. a line that is perpendicular to the dipole moment C. a line that makes an angle of 45◦ with the dipole moment D. a line that makes an angle of 30◦ with the dipole moment E. none of the above |
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Answer» B. a line that is perpendicular to the dipole moment |
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| 31. |
The electric field in a region around the origin is given by Vector E = C(xˆi + yˆj), where C is a constant. The equipotential surfaces in that region are: A. concentric cylinders with axes along the z axis B. concentric cylinders with axes along the x axis C. concentric spheres centered at the origin D. planes parallel to the xy plane E. planes parallel to the yz plane |
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Answer» A. concentric cylinders with axes along the z axis |
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| 32. |
The electric potential in a certain region of space is given by V = −7.5x2 + 3x, where V is in volts and x is in meters. In this region the equipotential surfaces are: A. planes parallel to the x axis B. planes parallel to the yz plane C. concentric spheres centered at the origin D. concentric cylinders with the x axis as the cylinder axis E. unknown unless the charge is given |
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Answer» B. planes parallel to the yz plane |
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| 33. |
Mention the group in which the instructions set of 8086 can be categorized . |
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Answer» The 8086 instructions are categorized into the following main types. i. Data Copy / Transfer Instructions ii. Arithmetic and Logical Instructions iii. Branch Instructions iv. Loop Instructions v. Machine Control Instructions vi. Flag Manipulation Instructions vii. Shift and Rotate Instructions viii. String Instructions |
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| 34. |
In an AP, if the common difference (d) = – 4, and the seventh term (a7) is 4, then find the first term. |
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Answer» a + 6 (–4) = 4 ⇒ a = 28 Detailed Answer : Given d = – 4 and a7 = 4 We know that nth term of A.P. is an = a + (n – 1)d a7 = a + (7 – 1)d [n = 7] 4 = a + 6(– 4) ∴ a = 4 + 24 = 28 ∴ First term of an A.P. = 28. n th term an = a1+ (n-1)d a7 = a1+( 7-1)* (-4) => 4 = a1+( 7-1)* (-4) => a1= 4-+24 =28 |
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| 35. |
If `x^(2) + 9y^(2) = 1`, then minimum and maximum value of `3x^(2) - 27y^(2) + 24xy` respectivelyA. `0, 5`B. `-5, 5`C. `-5, 10`D. `0, 10` |
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Answer» Correct Answer - B Let `x = cos theta, y = (1)/(3) sin theta` `Z = 3cos^(2)theta - 27(1)/(9) sin^(2)theta + 8 sinthetacostheta` `= 3 cos2theta + 4sin2theta rArr -5 le Z le 5` |
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| 36. |
The tangent to `y=a x^2+b x+7/2a t(1,2)`is parallel to thenormal at the point `(-2,2)`on the curve `y=x^2+6x+10 ,`then`a=-1`b. `a=1`c. `b=5/2`d. `b=-5/2`A. `a = 1`B. `a = -1`C. `b = (-15)/(2)`D. `b = (5)/(2)` |
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Answer» Correct Answer - A `y = x^(2) + 6x + 10` `:. (dy)/(dx) = 2x + 6` `(dy)/(dx)|(-2,2) = 2` `:.` slope of Normal,`m = - 1//2` `:. y = ax^(2) + bx + (7)/(2)` Passes through `(1,2) rArr a+ b = -3//2`…..(1) Also `(dy)/(dx)|(1,2) = 2a + b` `rArr - (1)/(2) = 2a + b`......(2) `[1]` and [2] `rArr a = 1 , b = -5//2` |
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| 37. |
Consider a hyperbola `(y^(2))/(4)-(x^(2))/(4) = alpha`, If the common tangent of the hyoerbola and parabola meets the coordinates axes at `x` and `A` and `B`, then locus of mid point of `AB` isA. `x^(2) = -2y`B. `2x^(2) = -y`C. `x^(2) = - 4y`D. `(x^(2))/(2) - (y^(2))/(1) = -1` |
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Answer» Correct Answer - B Equation of the common tangent is `y = tx - t^(2)` `:.` mid point of `AB` is `((l)/(2),(t^(2))/(2))` `:.` the locus is `y = -2x^(2)` |
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| 38. |
Find the discriminant of the quadratic equation 2x2 − 4x + 3 = 0 and hence find the nature of its roots. |
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Answer» Given quadratic equation is 2x2 − 4x + 3 = 0. By comparing given quadratic equation with standard quadratic equation ax2 + bx + c = 0, we get a = 2, b = −4 and c = 3. Now, the discriminant of given quadratic equation is D = b2 − 4ac = (−4)2 − 4 × 2 × 3 = 16 − 24 = −8 < 0. Hence, both roots are imaginary i.e., both roots are not real. (Because, if D = b2 − 4ac < 0, then its roots are imaginary means no real roots.) Hence, the quadratic equation 2x2 − 4x + 3 = 0 has no real roots. |
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| 39. |
How many time-outs can be taken in Kabaddi? |
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Answer» Two time-outs can be taken in Kabaddi. The duration of each time out is of 30 seconds. |
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| 40. |
Describe the main fouls in the Kabaddi game? |
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Answer» 1. To hold the raider with help of leg-scissors. 2. Outside coaching is not allowed, 3. To catch by hair intentionally is foul. 4. To try to stifle a raider by shutting his mouth or throttling him. 5. Using violent tackling by one player against the other. |
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| 41. |
Give five main fouls in a volleyball game? |
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Answer» Following are the five main fouls in a volleyball game:
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| 42. |
How many fouls are there in Basket-Ball Game? |
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Answer» There are five fouls in Basket-Ball game. For examples:
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| 43. |
Tell four fouls in a football game? |
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Answer» Following are the four main fouls in a football game:
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| 44. |
When is a player considered to be out? |
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Answer» A player who goes out of the boundary during the play shall be considered ‘out’. If an opponent goes out of the boundry and catches the raider, the raider shall not be considered ‘out’ but all the players catching shall be ‘out’. |
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| 45. |
Mention the length and breadth of the Kabaddi ground? |
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Answer» The length of Kabaddi ground is 12.50 metres and Breadth 10 metres. For junior boys and girls length and breadth is 11 and 8 metres respectively. |
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| 46. |
How many scores does Lona have? |
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Answer» Lona has two extra points. |
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| 47. |
Mention the number of players in Kabaddi? |
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Answer» There are twelve players in Kabaddi game. Out of them seven players actually play and five are substitutes. |
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| 48. |
If ______, then the quadratic equation has no real roots (A) D = 0 (B) D > 0 (C) D < 0 (D) D = 1 |
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Answer» Correct option (C) D < 0 Explanation: Condition for no real roots of quadratic equation is b2 – 4ac < 0 i.e., D < 0. |
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| 49. |
Without solving the equations find the nature of equation a2x2 +4ax +4 = 0 |
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Answer» a2x2 +4ax +4 = 0 D = b2 - 4ac = (4a)2 -4 x a2 x 4 = 16a2 - 16a2 = 0 D = 0 If D = 0, then the quadratic equation has 1 solution. |
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| 50. |
Without solving the equation find the nature of equation a2x2 +4ax +4 = 0. |
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Answer» a2x2 +4ax +4 = 0 D = b2 - 4ac = (4a)2 -4 x a2 x 4 = 16a2 - 16a2 = 0 D = 0 If D = 0, then the quadratic equation has 1 solution. |
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