100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	Electric field lines: A. are trajectories of a test charge B. are vectors in the direction of the electric field C. form closed loops D. cross each other in the region between two point charges E. are none of the above
Answer» E. are none of the above

Discussion

2.	The diagram shows the electric field lines in a region of space containing two small charged spheres (Y and Z). Then: A. Y is negative and Z is positive B. the magnitude of the electric field is the same everywhere C. the electric field is strongest midway between Y and Z D. the electric field is not zero anywhere (except infinitely far from the spheres) E. Y and Z must have the same sign
Answer» D. the electric field is not zero anywhere (except infinitely far from the spheres)

Discussion

3.	The diagram shows the electric field lines due to two charged parallel metal plates. We conclude that: A. the upper plate is positive and the lower plate is negative B. a proton at X would experience the same force if it were placed at Y C. a proton at X experiences a greater force than if it were placed at Z D. a proton at X experiences less force than if it were placed at Z E. an electron at X could have its weight balanced by the electrical force
Answer» B. a proton at X would experience the same force if it were placed at Y

Discussion

4.	The diagram shows the electric field lines in a region of space containing two small charged spheres (Y and Z). Then:A. Y is negative and Z is positive B. the magnitude of the electric field is the same everywhere C. the electric field is strongest midway between Y and Z D. Y is positive and Z is negative E. Y and Z must have the same sign
Answer» D. Y is positive and Z is negative

Discussion

5.	KI in acetone, undergoes `S_(N)2` reaction with each of `P,Q ,R` and S The rates of the reaction very as `underset(P)(H_(3)C-Cl)` .A. P gt Q gt R gt SB. S gt P gt R gt QC. P gt R gt Q gt SD. R gt P gt S gt Q
Answer» Correct Answer - B

Discussion

6.	The electric field due to a uniform distribution of charge on a spherical shell is zero: A. everywhere B. nowhere C. only at the center of the shell D. only inside the shell E. only outside the shell
Answer» D. only inside the shell

Discussion

7.	Two charged point particles are located at two vertices of an equilateral triangle and the electric field is zero at the third vertex. We conclude: A. the two particles have charges with opposite signs and the same magnitude B. the two particles have charges with opposite signs and different magnitudes C. the two particles have identical charges D. the two particles have charges with the same sign but different magnitudes E. at least one other charged particle is present
Answer» E. at least one other charged particle is present

Discussion

8.	A charged particle is placed in an electric field that varies with location. No force is exerted on this charge: A. at locations where the electric field is zero B. at locations where the electric field strength is 1/(1.6 × 10−19) N/C C. if the particle is moving along a field line D. if the particle is moving perpendicularly to a field line E. if the field is caused by an equal amount of positive and negative charge
Answer» A. at locations where the electric field is zero

Discussion

9.	An isolated charged point particle produces an electric field with magnitude E at a point 2 m away from the charge. A point at which the field magnitude is E/4 is: A. 1 m away from the particle B. 0.5 m away from the particle C. 2 m away from the particle D. 4 m away from the particle E. 8 m away from the particle
Answer» D. 4 m away from the particle

Discussion

10.	The hyperconjugative stabilities of tert-butyl cation and `2`-butene, respectively, are due toA. `sigmararrp` (empty) and `sigmararrpi^()` electron delocalizationsB. `sigmararrsigma^()` and `sigmararrpi` delectron delocalizationsC. `sigmararrp` (filled) and `sigmararrpi` electron delocalizationsD. p(fillled)`rarrsigma^()` and `sigma rarrpi^()` electron delocalizations
Answer» Correct Answer - A

Discussion

11.	The stability order in the following carbocations, `CH_(3)CH_(2)^(+)"(I), "(CH_(3))_(2)overset(+)CH"(II), "(CH_(3))_(3)C^(+)"(III) "overset(+)CH_(3)"(IV)"` is :A. `IgtIVgtIIIgtII`B. `IgtIIgtIIIgtIV`C. `IIIgtIVgtIgtII`D. `IIIgtIIgtIgtIV`
Answer» Correct Answer - D

Discussion

12.	The order of stability of the following carbocations: `underset("I")(CH_(2)C=CH-overset(o+)CH_(2))" , "underset("II")(CH_(3)-CH_(2)-overset(o+)CH_(2))" , "underset("III")(C_(6)H_(5)-overset(o+)CH_(2))`A. III gt I gt IIB. III gt II gt IC. II gt III gt ID. I gt II gt III
Answer» Correct Answer - A

Discussion

13.	A solution of (-l)- chloro -1 phenyletane in toluene recemises slowly in the presence of a small amunt of `SbCI_(5)` due to the formation of .A. free radicalB. carbanionC. carbeneD. carbocation
Answer» Correct Answer - D

Discussion

14.	Ksp = [A]3 [B]2 for the salt where A and B are the cation and anion as the case may be stand true for:(a) Ca3 (PO4)2 (b) As2S3(c) Bi2S3 (d) All are correct
Answer» Correct option: (d) Explanation: For each case K_sp = [A²⁺]³ [B^3–]²

14.

Ksp = [A]3 [B]2 for the salt where A and B are the cation and anion as the case may be stand true for:(a) Ca3 (PO4)2 (b) As2S3(c) Bi2S3 (d) All are correct

Answer»

Correct option: (d)

Explanation:

For each case K_sp = [A²⁺]³ [B^3–]²

Discussion

15.	A saturated solution of calcium fluoride contains 2 x 10–4 mole of the salt per litre of the solution. Its Ksp is:(a) 8 x 10–18 (b) 3.2 x 10–11(c) 4 x 10–6 (d) 1.43 x 10–9
Answer» Correct option: (b) 3.2 x 10^–11 Explanation: K_sp for CaF₂ = 4s³ = 4 x (2 x 10^–4)³ = 3.2 x 10^–11

15.

A saturated solution of calcium fluoride contains 2 x 10–4 mole of the salt per litre of the solution. Its Ksp is:(a) 8 x 10–18 (b) 3.2 x 10–11(c) 4 x 10–6 (d) 1.43 x 10–9

Answer»

Correct option: (b) 3.2 x 10^–11

Explanation:

K_sp for CaF₂ = 4s³ = 4 x (2 x 10^–4)³

= 3.2 x 10^–11

Discussion

16.	If the solubility of Pb3(PO4)2 is s mol per litre, then the solubility product of Pb3(PO4)2 will be:(a) 6s2 (b) 6s5(c) s5 (d) 108s5
Answer» Correct option: (d) 108 s⁵ Explanation: K_sp = [Pb²⁺] [PO₄^2-]² (3s)³ (2s)² = 108 s⁵

16.

If the solubility of Pb3(PO4)2 is s mol per litre, then the solubility product of Pb3(PO4)2 will be:(a) 6s2 (b) 6s5(c) s5 (d) 108s5

Answer»

Correct option: (d) 108 s⁵

Explanation:

K_sp = [Pb²⁺] [PO₄^2-]² (3s)³ (2s)²

= 108 s⁵

Discussion

17.	Compare the stability of following carbanion?
Answer» The correct stability of carbanion is as follow: (3) > (1) > (2) > (4)

17.

Compare the stability of following carbanion?

Answer»

The correct stability of carbanion is as follow:

(3) > (1) > (2) > (4)

Discussion

18.	The solubility of AgCl (Ksp = 1.2 x 10–10) in a 0.10 M NaCl solution is:(a) 0.1 M (b) 1.2 x 10–6 M(c) 1.2 x 10–9 M (d) 1.2 x 10–10 M
Answer» Correct option: (c) 1.2 x 10^–9 M Explanation: K_sp AgCl = 1.2 x 10^–10 = [Ag⁺] [Cl^–] = [s][s + 0.1] where s is solubility of AgCl ∴ K_sp = s x 0.1 = 1.2 x 10^–10 ∴ s = 1.2 x 10^–9 M

18.

The solubility of AgCl (Ksp = 1.2 x 10–10) in a 0.10 M NaCl solution is:(a) 0.1 M (b) 1.2 x 10–6 M(c) 1.2 x 10–9 M (d) 1.2 x 10–10 M

Answer»

Correct option: (c) 1.2 x 10^–9 M

Explanation:

K_sp AgCl = 1.2 x 10^–10 = [Ag⁺] [Cl^–] = [s][s + 0.1]

where s is solubility of AgCl

∴ K_sp = s x 0.1 = 1.2 x 10^–10

∴ s = 1.2 x 10^–9 M

Discussion

19.	The 2 conformations shown below belongs to the compound cyclohexane. Infinite number of conformations are possible for cyclo hexane. But these 2 conformations given below has a peculiarity. Try to nd it. Also, dene the terms conformers and the phenomenon conformation?
Answer» Infinite number of conformations are possible for cyclohexane. Out of it chair conformation is the most stable one and the boat conformation is the least stable form. The different arrangement of a compound which arises as a result of rotation about carbon single bond are called conformers and the phenomenon is called conformation

19.

The 2 conformations shown below belongs to the compound cyclohexane. Infinite number of conformations are possible for cyclo hexane. But these 2 conformations given below has a peculiarity. Try to nd it. Also, dene the terms conformers and the phenomenon conformation?

Answer»

Infinite number of conformations are possible for cyclohexane. Out of it chair conformation is the most stable one and the boat conformation is the least stable form.

The different arrangement of a compound which arises as a result of rotation about carbon single bond are called conformers and the phenomenon is called conformation

Discussion

20.	Order of stability of given carbocation is(1) A > B > C(2) C > B > A(3) B > A > C(4) B > C > A
Answer» Correct option is (3) B > A > C B is more stable due to resonance.

20.

Order of stability of given carbocation is(1) A > B > C(2) C > B > A(3) B > A > C(4) B > C > A

Answer»

Correct option is (3) B > A > C

B is more stable due to resonance.

Discussion

21.	Arrange the following carbocation according to stability A. `R gt Q gt S gt P`B. `Q gt R gt P gt S`C. `Q gt R gt S gt P`D. `R gt Q gt P gt S`
Answer» Correct Answer - C First electron gain enthalpy of all elements is negative except N & Be.

Discussion

22.	in the above given compound how many functional group reduced by LAH (lithium aluminium hydride) and SBH (sodium Borohydride) respectively ?A. 4,4B. 4,3,C. 3,4D. 4,2
Answer» Correct Answer - D SBH reduces only aldehyde & ketone while stronger LAH reducess aldehyde into appropriate alcohol.

Discussion

23.	Which of the following alcohols gives a red colour in victor meyer test :-A. n- propyl alcoholB. isoproyl alcoholC. `(CH_(3))_(3)C-OH`D. Sec. Buty alcohol
Answer» Correct Answer - A `I^(@)` alcohols give colour in victor meyer test.

Discussion

24.	Which of the following alcohol gives the white turbidity imediately with `HCl+ZnCl_(2)` (anhy.)?A. `CH_(3)-underset(OH)underset(\|)overset(Ph) overset(\|)(C)-OC_(2)H_(5)`B. `Ph-underset(OH)underset(\|)(CH)-CH_(3)`C. `Ph-underset(OH)underset(\|)(CH)-CH=CH_(2)`D. `CH_(3)-CH_(2)CH_(2)OH`
Answer» Correct Answer - A::B::C Alcohols that can from stable carbocation

Discussion

25.	Which of the following alcohols gives the best yield of dialkyl ether on being heated with a trace of sulphuric acid? (1) 1-pentanol (2) 2-pentanol(3) cyclopentanol (4) 2-propano
Answer» 1-pentanol alcohols gives the best yield of dialkyl ether on being heated with a trace of sulphuric acid.

Discussion

26.	Statement-1: For the reaction: `Ni^(2+)+2e^(-)rarrNi` and `Fe^(2+)+2e^(-)rarrFe` `rArr E_(Fe^(2+)\|Fe)^(@)ltE_(Ni^(2+)\|Ni)^(@)` and `E_("Red")^(@)gt0` `rArr` So Fe electrode is cathode and Ni electrode is anode. Statement-2: If `DeltaG^(@) lt0` and `E_("Cell")^(@)lt0`, then , cell is feasible.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-2C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True.
Answer» Correct Answer - D `E_(Ni^(+2)\|Ni)^@=-0.24 " " E_(Fe^(+2)\|Fe)^@=-0.44` `E_(Cell)^@=E_(Fe\|Fe^(+2))^@+E_(Ni^(+2)\|Ni)^@` =0.44-0.24=0.20 Fe electrode Anode, Ni electrode cathode `DeltaG lt 0 " " E_(Cell)gt0` For working of cell

Discussion

27.	Diethyl ether combines with CO under specific conditions to form `:`A. acetic acidB. carbon dioxideC. ethyl propanoateD. acetyl chloride
Answer» Correct Answer - C

Discussion

28.	Diethyl ether by regareded as anhydride of :A. `C_2H_5COOH`B. `C_2H_5OH`C. `C_2H_5CHO`D. `C_2H_5COOC_2H_5`
Answer» Correct Answer - B

Discussion

29.	Write the Arrhenius equation and mention what each term stands for.
Answer» \(\frac{-Ea}{RT}\) K = A.e Where K = rate constant A = Arrhenices constant Ea = Energy of activation T = Temperature R = Gas constant

29.

Write the Arrhenius equation and mention what each term stands for.

Answer»

\(\frac{-Ea}{RT}\)

K = A.e

Where K = rate constant

A = Arrhenices constant

Ea = Energy of activation

T = Temperature

R = Gas constant

Discussion

30.	Any two differences between lanthanides and Actinides.
Answer» Lanthanides: 1. 4f – orbital is progressively filled 2. Only Pm (promethion) is radio active 3. They are less reactive Actinides: 1. 5f – orbital os progressively filled 2. All are radio active 3. They are more reactive

30.

Any two differences between lanthanides and Actinides.

Answer»

Lanthanides:

1. 4f – orbital is progressively filled

2. Only Pm (promethion) is radio active

3. They are less reactive

Actinides:

1. 5f – orbital os progressively filled

2. All are radio active

3. They are more reactive

Discussion

31.	What are antacids? Give an example.
Answer» The chemical substances which are used in the treatment of acidity are called antacids. Ex: Ranitidine (Zantac)

31.

What are antacids? Give an example.

Answer»

The chemical substances which are used in the treatment of acidity are called antacids.

Ex: Ranitidine (Zantac)

Discussion

32.	Why is fluoroacetic acid a stronger acid than acetic acid?
Answer» The larger the electron-withdrawing inductive effect the greater is the acidity. −I effect of F > Cl. Therefore, Fluoroacetic acid is stronger acid than chloroacetic acid.

32.

Why is fluoroacetic acid a stronger acid than acetic acid?

Answer»

The larger the electron-withdrawing inductive effect the greater is the acidity.

−I effect of F > Cl. Therefore, Fluoroacetic acid is stronger acid than chloroacetic acid.

Discussion

33.	What are the effects of the electron withdrawing and electron donating groups on acidity of carboxylic acids.
Answer» Electron donating group decreases acidic strength and electron with drawing group increases acidic strength of carboxylic acids.

Discussion

34.	Equivalent condictance of `BaCI_(2), H_(2)SO_(4)` and `HCI` are `x_(1) , x_(2)` and `x_(3) S cm^(2) "equiv"^(-1)` at infinite dilution , if specific condictance of structured `BaSO_(4)` solution is of `y S cm^(-1)` then `K_(p)` of `BaSO_(4)` isA. `(10^(3)y)/(2(x_(1) + x_(2)- 2x_(3)))`B. `(10^(6)y^(2))/((x_(1) + x_(2)- 2x_(3))^(2))`C. `(10^(6)y^(23))/(4(x_(1) x_(2)- 2x_(3))^(2))`D. `(x_(1) x_(2)- 2x_(3))/(10^(3)y^(2))`
Answer» Correct Answer - c `Delta_(BaSO_(4))^(@) = Delta_(BaCI_(2))^(@) + Delta_(H_(2)SO_(4))^(@) - 2 Delta_(HCI)^(@)` `= (x_(1) + x_(2) - 2x_(3))` `Delta_(BaSO_(4))^(@) = (1000 xx "sp. Conductance")/("solubility (in saturated solutions)")` `(x_(1) + x_(2) xx 2x_(3)) = (1000 y)/("solubility")` `:.` Solubilty of `BaSO_(4) = (1000y)/((x_(1)+x_(2) -2x_(3)))N` `= (1000y)/(2(x_(1)+x_(2)-2x_(3)))M` `BaSO_(4) rarr Ba^(2+) + SO_(4)^(2-)` `K_(sp) (BaSO_(4)) = [Ba^(2+)] [SO_(4)^(2-)] M^(2) = (10^(6)y^(2))/(4(x_(1)+x_(2)-2x_(3))^(2))`

Discussion

35.	Under standered condition `Delta G^(@)` for the reaction `2Cr(s)= 3Cd^(2+)(aq) rarr 2Cr_((a a))^(3+) +3Cd(s)` is `(E_(Cr^(3+)//Cr)^(@) = - 0.74 V, E_(Cd^(2+)//Cd)^(@) = - 0.4 V)`A. `-65.62 J` moleB. `-196.86 kJ` moleC. `- 98.43 kJ` moleD. `-96.86 J `mole
Answer» Correct Answer - b `Delta G^(@) = - nFE_(cell)^(@) - 6 xx 96500 + 0.34 = - 196.86 KJ// mol`

Discussion

36.	Calculate the standard cell potentials of galvanic cell in whiCHM the following reactions take place `:` `a. Cr(s) +3Cd^(2+)(aq) rarr 2Cr^(3+)(aq)+3Cd` `b. Fe^(2+)(aq)+Ag^(o+)(aq)rarr Fe^(3+)(aq)+Ag(s)` Calculate the `Delta_(r)G^(c-)` and equilibrium constant of the reactions .
Answer» Correct Answer - `a. Delta_(r)G^(c-)=-196.86 kJ mol^(-1),K_(c)=3.192xx10^(34)` `b. Delta_(r)G^(c-)=-2.895 kJmol^(-1),K_(c)=3.22` a. `E_("cell")^(c-)=E_("cathode")^(c-)-E_("anode")^(c-)` `=-0.40V-(-0.74)=+0.34V` `Delta_(r)G^(c-)=-nFE_("cell")^(c-)` `=-6 molxx96400C mol^(-1)xx0.34V` `=-196860J mol^(-1)=-196.86k J mol^(-1)` `Delta_(r)G^(c-)=--2.303RTlogK` `196860=2.303xx8.314xx298 log K` `logK=34.5014` `K="Antilog" (34.5014)=3.192xx10^(34)` `b`. `E^(c-)``_(cell)=+0.80V-0.77V=+0.03V` `Delta_(r)G^(c-)=-nFE_(cell)^(c-)` `=-(1 mol)xx(96500 C mol^(-1))xx(0.03V)` `=-2895J mol^(-1) Delta_(r)G^(c-)=-2.303RTlogK` `-2895=-2.303xx8.314xx298xxlogK` or log `K =0.5074` or `K ="Anitlog"(0.5074)=3.22`

Discussion

37.	Compound (X)`C_9H_10O` is inert to `Br_2//C Cl_4`.Vigorous oxidation with hot alkaline `KMnO_4//OH` yield `C_6H_5COOH` (X) gives precipitate with 2,4-Dintrophenyl hydrazine. How can these isomers be distinguished by the usual chemical tests ? Following are possible isomers of X : (i)`C_6H_5-CH_2-CH_2-CHO` , (ii)`C_6H_5-undersetunderset(CH_3)(\|)CH-CHO` (iii)`C_6H_5-CH_2-oversetoverset(O)(\|\|)C-CH_3` , (iv)`C_6H_5-oversetoverset(O)(\|\|)C-CH_2-CH_3`A. I gives red ppt. with Fehling solution and II & III can be distinguished by iodoform testB. I & II can be distinguished by simple chemical methodC. I & II give red ppt. with Fehling solution and III & IV can be distinguished by iodoform testD. II gives red ppt. with Fehling solution and I & IV can be distinguished by iodoform test
Answer» Correct Answer - A,C I & IV both compounds do not give iodoform test and I & II both given similar test

Discussion

38.	How can we improve the success rate of fertilisation during artificial insemination in animal husbandry programmes?
Answer» The technology is called MOET or Multiple Ovulation Embryo Transfer. During the procedure, a cow is given hormonal treatment so that more than one ovule (6-8 eggs) is produced per cycle. After mating or artificial insemination the embryos at 8-32 celled state are transferred to different surrogate mother cows. The method has been successfully used for cattle, sheep, buffalo etc.

Discussion

39.	How are the colloidal solutions classified on the the basis of physical states of the dispersed phase and dispersion medium ?
Answer» Correct Answer - Refer to section

Discussion

40.	Which of the following is a lanthanide ?A. CuriumB. CaliforniumC. UraniumD. Europium
Answer» Correct Answer - D (A),(B) and (C ) are actinoids where as (D) europium is lanthanide

Discussion

41.	Which of the following statement is not correct?A. `La(OH)_3` is less basic than `Li(OH)_3`B. In lanthaniode series, ionic radius of `Ln^(3+)` ion decreases.C. La is actually an element of transition series rather than lanthaniodes.D. Atomic radius of Zr and Hf are same because of lanthaniode contraction.
Answer» Correct Answer - A `La(OH)_3` is more basic than `Li(OH)_3` In lanthaniodes the basic character of hydroxides decreases as the ionic radius decreases.

Discussion

42.	The ionic radius of `._(57)La^(3+)` is 1.06Å. Which one of the following given values will be closest to the ionic radius of `._21Lu^(3+)`?A. 1.06ÅB. 1.56ÅC. 0.85ÅD. 1.35Å
Answer» Correct Answer - D Ionic radius of `Lu^(3+)` is smaller than that of `La^(3+)`because of lanthanide contraction across the period.

Discussion

43.	I am a number between 31 and 41. I am a multiple of 3. I am an even number. What number am I?
Answer» Number is 36

Discussion

44.	An object starting from rest travels 20 m in the first 2s and 160 m in next 4s. What will be the velocity after 7s from the start?
Answer» Using the second equation of motion: s = ut + \(\frac12\)at² where: s = distance covered = 20 m u = initial velocity = 0 m/s a = acceleration = ? m/s² t = time = 2s s = ut + \(\frac12\)at² 20 = 0 × 2 + \(\frac12\)× a × 2² 20 = 0 + 2 × a a = 10 m/s² Final velocity, v after 2s The first equation of motion: v = u + at where: v = final velocity = ? u = initial velocity = 0 m/s a = acceleration = 10 m/s² t = time = 2s v = u + at v = 0 + 10 × 2 = 20 m/s Now it is given that in next 4s it covers 160 m. But now the vehicle has gained some velocity. So the final velocity of the previous case will become the initial velocity in this case. Using the second equation of motion: s = ut + \(\frac12\)at² where: s = distance covered = 160 m u = initial velocity = 20 m/s a = acceleration = ? m/s² t = time = 4s s = ut + \(\frac12\)at² 160 = 20 × 4 + \(\frac12\)× a × 4× 4 160 = 80 + a × 8160 – 80 = a × 880 = a × 8a = 10 m/s² This shows that acceleration is uniform. The first equation of motion: v = u + at where: v = final velocity = ? u = initial velocity = 0 m/s a = acceleration = 10 m/s² t = time = 7s v = u + at v = 0 + 10 × 7 v = 70 m/s

44.

An object starting from rest travels 20 m in the first 2s and 160 m in next 4s. What will be the velocity after 7s from the start?

Answer»

Using the second equation of motion: s = ut + \(\frac12\)at²

where: s = distance covered = 20 m

u = initial velocity = 0 m/s

a = acceleration = ? m/s²

t = time = 2s

s = ut + \(\frac12\)at²

20 = 0 × 2 + \(\frac12\)× a × 2²

20 = 0 + 2 × a

a = 10 m/s²

Final velocity, v after 2s

The first equation of motion: v = u + at

where: v = final velocity = ?

u = initial velocity = 0 m/s

a = acceleration = 10 m/s²

t = time = 2s

v = u + at

v = 0 + 10 × 2 = 20 m/s

Now it is given that in next 4s it covers 160 m. But now the vehicle has gained some velocity. So the final velocity of the previous case will become the initial velocity in this case.

Using the second equation of motion: s = ut + \(\frac12\)at²

where: s = distance covered = 160 m

u = initial velocity = 20 m/s

a = acceleration = ? m/s²

t = time = 4s

s = ut + \(\frac12\)at²

160 = 20 × 4 + \(\frac12\)× a × 4× 4

160 = 80 + a × 8160 – 80 = a × 880 = a × 8a = 10 m/s²

This shows that acceleration is uniform.

The first equation of motion: v = u + at

where: v = final velocity = ?

u = initial velocity = 0 m/s

a = acceleration = 10 m/s² t = time = 7s

v = u + at

v = 0 + 10 × 7

v = 70 m/s

Discussion

45.

What are the differences between Kinetic and Potential Energy?

Answer»

Difference Between Kinetic and Potential Energy:

Kinetic Energy	Potential Energy
Kinetic energy is the kind of energy present in a body due to the property of its motion	Potential Energy is the type of energy present in a body due to the property of its state
It can be easily transferred from one body to another	It is not transferable
The determining factors for kinetic energy are Speed or velocity and mass	Here, the determining factors are Height/ distance and mass
Flowing water is one of the examples of kinetic energy	Water present at the top of a hill is an example of potential energy
It is relative with respect to nature	It is non-relative with respect to nature

Discussion

46.	Let `Delta^(2)` be the discriminant and `alpha,beta` be the roots of the equation `ax^(2)+bx+c=0` then `2aalpha+Delta` and `2abeta-Delta` can be roots of the equation.A. `x^(2)+2bx+b^(2)=0`B. `x^(2)-2bx+b^(2)=0`C. `x^(2)+2bx-3b^(2)+16ac=0`D. `x^(2)-2bx-3b^(2)+16ac=0`
Answer» Correct Answer - A::C::D `alpha,beta=(-b+-Delta)/(2a)` `alpha=(-b-Delta)/(2a),beta=(-b+Delta)/(2a)` or `alpha=(-b+Delta)/(2a),beta=(-b-Delta)/(2a)` `implies2aalpha+Delta=-b&2alphabeta-Delta=-b` `implies2aalpha+Delta=-b&2abeta-Delta-b` `implies2aalpha+Delta=-b+2Delta` Sum of roots `=-2b` sum of roots `=-2b` product of root `=b^(2)` product of root `=b^(2)-4`.`(b^(2)-4ac)` Hence equation is `x^(2)+2bx+b^(2)=0` `=-3b^(2)+16ac` Hence equation is `x^(2)+2bx-3b^(2)+16ac=0`

Discussion

47.	A particle is projected in such a way that it follows a curved path with constant acceleration `vec(a)`. For finite interval of motion. Which of the following option `(s)` may be correct `:` `vec(u)=` initial velocity `vec(a)=` acceleration of particle `vec(v)=` velocity at `tgt0`A. `\|vec(a)xxvec(u)\|cancel(=)0`B. `\|vec(a)xxvec(v)\|=0`C. `\|vec(u)xxvec(v)\|=0`D. `\|vec(u).vec(v)\|=0`
Answer» Correct Answer - A::D If `\|vec(a)xxvec(u)\|=0` particle its will not forllow curved path. Above described motion is a projectile motion with parabolic path.

Discussion

48.	A particle moves in xy plane with a velocity by `vec(v)=(8t-2)hat(i)+2hat(j)`. If it passes through the point (14, 4) at t = 2 sec, then give equation of the path.A. `x + y - y^(2) = 2`B. `y^(2)+x=4`C. `x-y-y^(2)=2`D. `y + x + y^(2)=2`
Answer» Correct Answer - A `V = 8t -2` `intdx = int(8t-2)dt` `x = 4t^(2)-2t +c` At `t =2,x = 14 implies " "14=4(4) -2(2)+c " implies "c = 2` `x = 4t^(2)-2t+2,v_(y)=2` `intdy int2dt` `y = 2t + c` At `t =2, y = 4 " implies "c = 0` ` y = 2t` Equation `implies " " x = (2t)^(2)-2t +2` `implies" " x=y^(2)-y+2` `implies " "x + y-y^(2) =2`

Discussion

49.	Trajectory of a particle in a projectile motion is given by `y=x-x^(2)/80` where x and y are in meters. Match the column-1 and column-2. `{:(,"Column-I",,"Column-II"),("(A)","x coordinate at height of 15 m",,"(P) 20 m"),("(B)",underset("point of projection at x= 100 m")"vertical distnce of particle from",,"(Q) 80 m"),("(C)","Horizontal range",,"(R) 60 m"),(,,,"(S) 25 m"):}`
Answer» Correct Answer - [(A)PR(B)S(C)Q] (A)`15=x-x^(2)/80` `1200=80x-x^(2)` `x^(2)-80x+1200=0` `x^(2)-60x-20x+1200=0` `x=60,20` (B) `y=100-(100)^(2)/80=100-(1000)/82=25` (C) `Hz range:x-x^(2)/80=0Rightarrow x(x-x/80)=0,x=(0,80)`

Discussion

50.	The velocity of a particle is given by `vec(v) = 2hat(i)-hat(j)+2hat(k)` in `m//s` for time interval `t = 0` to `t = 10` sec. If the distance travelled by the particle in given time interval `10n`, find value of `n` is.
Answer» Correct Answer - `3` Speed of particle is `\|V\| = sqrt((2)^(2) + (1)^(2) + (2)^(2))` `\|V\| = 3m//sec` `Soverset(10)underset(0)(int)\|V\|dt = overset(10)underset(0)(int)3dt = \|3t\|_(0)^(10)` `S = 30 m`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Electric field lines: A. are trajectories of a test charge B. are vectors in the direction of the electric field C. form closed loops D. cross each other in the region between two point charges E. are none of the above

KI in acetone, undergoes `S_(N)2` reaction with each of `P,Q ,R` and S The rates of the reaction very as `underset(P)(H_(3)C-Cl)` .A. P gt Q gt R gt SB. S gt P gt R gt QC. P gt R gt Q gt SD. R gt P gt S gt Q

The electric field due to a uniform distribution of charge on a spherical shell is zero: A. everywhere B. nowhere C. only at the center of the shell D. only inside the shell E. only outside the shell

The stability order in the following carbocations, `CH_(3)CH_(2)^(+)"(I), "(CH_(3))_(2)overset(+)CH"(II), "(CH_(3))_(3)C^(+)"(III) "overset(+)CH_(3)"(IV)"` is :A. `IgtIVgtIIIgtII`B. `IgtIIgtIIIgtIV`C. `IIIgtIVgtIgtII`D. `IIIgtIIgtIgtIV`

The order of stability of the following carbocations: `underset("I")(CH_(2)C=CH-overset(o+)CH_(2))" , "underset("II")(CH_(3)-CH_(2)-overset(o+)CH_(2))" , "underset("III")(C_(6)H_(5)-overset(o+)CH_(2))`A. III gt I gt IIB. III gt II gt IC. II gt III gt ID. I gt II gt III

A solution of (-l)- chloro -1 phenyletane in toluene recemises slowly in the presence of a small amunt of `SbCI_(5)` due to the formation of .A. free radicalB. carbanionC. carbeneD. carbocation

Ksp = [A]3 [B]2 for the salt where A and B are the cation and anion as the case may be stand true for:(a) Ca3 (PO4)2 (b) As2S3(c) Bi2S3 (d) All are correct

A saturated solution of calcium fluoride contains 2 x 10–4 mole of the salt per litre of the solution. Its Ksp is:(a) 8 x 10–18 (b) 3.2 x 10–11(c) 4 x 10–6 (d) 1.43 x 10–9

If the solubility of Pb3(PO4)2 is s mol per litre, then the solubility product of Pb3(PO4)2 will be:(a) 6s2 (b) 6s5(c) s5 (d) 108s5

Compare the stability of following carbanion?

The solubility of AgCl (Ksp = 1.2 x 10–10) in a 0.10 M NaCl solution is:(a) 0.1 M (b) 1.2 x 10–6 M(c) 1.2 x 10–9 M (d) 1.2 x 10–10 M

The 2 conformations shown below belongs to the compound cyclohexane. Infinite number of conformations are possible for cyclo hexane. But these 2 conformations given below has a peculiarity. Try to nd it. Also, dene the terms conformers and the phenomenon conformation?

Order of stability of given carbocation is(1) A > B > C(2) C > B > A(3) B > A > C(4) B > C > A

Arrange the following carbocation according to stability A. `R gt Q gt S gt P`B. `Q gt R gt P gt S`C. `Q gt R gt S gt P`D. `R gt Q gt P gt S`

in the above given compound how many functional group reduced by LAH (lithium aluminium hydride) and SBH (sodium Borohydride) respectively ?A. 4,4B. 4,3,C. 3,4D. 4,2

Which of the following alcohols gives a red colour in victor meyer test :-A. n- propyl alcoholB. isoproyl alcoholC. `(CH_(3))_(3)C-OH`D. Sec. Buty alcohol

Which of the following alcohol gives the white turbidity imediately with `HCl+ZnCl_(2)` (anhy.)?A. `CH_(3)-underset(OH)underset(|)overset(Ph) overset(|)(C)-OC_(2)H_(5)`B. `Ph-underset(OH)underset(|)(CH)-CH_(3)`C. `Ph-underset(OH)underset(|)(CH)-CH=CH_(2)`D. `CH_(3)-CH_(2)CH_(2)OH`

Which of the following alcohols gives the best yield of dialkyl ether on being heated with a trace of sulphuric acid? (1) 1-pentanol (2) 2-pentanol(3) cyclopentanol (4) 2-propano

Diethyl ether combines with CO under specific conditions to form `:`A. acetic acidB. carbon dioxideC. ethyl propanoateD. acetyl chloride

Diethyl ether by regareded as anhydride of :A. `C_2H_5COOH`B. `C_2H_5OH`C. `C_2H_5CHO`D. `C_2H_5COOC_2H_5`

Write the Arrhenius equation and mention what each term stands for.

Any two differences between lanthanides and Actinides.

What are antacids? Give an example.

Why is fluoroacetic acid a stronger acid than acetic acid?

What are the effects of the electron withdrawing and electron donating groups on acidity of carboxylic acids.

Under standered condition `Delta G^(@)` for the reaction `2Cr(s)= 3Cd^(2+)(aq) rarr 2Cr_((a a))^(3+) +3Cd(s)` is `(E_(Cr^(3+)//Cr)^(@) = - 0.74 V, E_(Cd^(2+)//Cd)^(@) = - 0.4 V)`A. `-65.62 J` moleB. `-196.86 kJ` moleC. `- 98.43 kJ` moleD. `-96.86 J `mole

Calculate the standard cell potentials of galvanic cell in whiCHM the following reactions take place `:` `a. Cr(s) +3Cd^(2+)(aq) rarr 2Cr^(3+)(aq)+3Cd` `b. Fe^(2+)(aq)+Ag^(o+)(aq)rarr Fe^(3+)(aq)+Ag(s)` Calculate the `Delta_(r)G^(c-)` and equilibrium constant of the reactions .

How can we improve the success rate of fertilisation during artificial insemination in animal husbandry programmes?

How are the colloidal solutions classified on the the basis of physical states of the dispersed phase and dispersion medium ?

Which of the following is a lanthanide ?A. CuriumB. CaliforniumC. UraniumD. Europium

The ionic radius of `._(57)La^(3+)` is 1.06Å. Which one of the following given values will be closest to the ionic radius of `._21Lu^(3+)`?A. 1.06ÅB. 1.56ÅC. 0.85ÅD. 1.35Å

I am a number between 31 and 41. I am a multiple of 3. I am an even number. What number am I?

An object starting from rest travels 20 m in the first 2s and 160 m in next 4s. What will be the velocity after 7s from the start?

What are the differences between Kinetic and Potential Energy?

Let `Delta^(2)` be the discriminant and `alpha,beta` be the roots of the equation `ax^(2)+bx+c=0` then `2aalpha+Delta` and `2abeta-Delta` can be roots of the equation.A. `x^(2)+2bx+b^(2)=0`B. `x^(2)-2bx+b^(2)=0`C. `x^(2)+2bx-3b^(2)+16ac=0`D. `x^(2)-2bx-3b^(2)+16ac=0`

A particle moves in xy plane with a velocity by `vec(v)=(8t-2)hat(i)+2hat(j)`. If it passes through the point (14, 4) at t = 2 sec, then give equation of the path.A. `x + y - y^(2) = 2`B. `y^(2)+x=4`C. `x-y-y^(2)=2`D. `y + x + y^(2)=2`

The velocity of a particle is given by `vec(v) = 2hat(i)-hat(j)+2hat(k)` in `m//s` for time interval `t = 0` to `t = 10` sec. If the distance travelled by the particle in given time interval `10n`, find value of `n` is.

Explore topic-wise InterviewSolutions in Current Affairs.

Electric field lines: A. are trajectories of a test charge B. are vectors in the direction of the electric field C. form closed loops D. cross each other in the region between two point charges E. are none of the above

KI in acetone, undergoes `S_(N)2` reaction with each of `P,Q ,R` and S The rates of the reaction very as `underset(P)(H_(3)C-Cl)` .A. P gt Q gt R gt SB. S gt P gt R gt QC. P gt R gt Q gt SD. R gt P gt S gt Q

The electric field due to a uniform distribution of charge on a spherical shell is zero: A. everywhere B. nowhere C. only at the center of the shell D. only inside the shell E. only outside the shell

The stability order in the following carbocations, `CH_(3)CH_(2)^(+)"(I), "(CH_(3))_(2)overset(+)CH"(II), "(CH_(3))_(3)C^(+)"(III) "overset(+)CH_(3)"(IV)"` is :A. `IgtIVgtIIIgtII`B. `IgtIIgtIIIgtIV`C. `IIIgtIVgtIgtII`D. `IIIgtIIgtIgtIV`

The order of stability of the following carbocations: `underset("I")(CH_(2)C=CH-overset(o+)CH_(2))" , "underset("II")(CH_(3)-CH_(2)-overset(o+)CH_(2))" , "underset("III")(C_(6)H_(5)-overset(o+)CH_(2))`A. III gt I gt IIB. III gt II gt IC. II gt III gt ID. I gt II gt III

A solution of (-l)- chloro -1 phenyletane in toluene recemises slowly in the presence of a small amunt of `SbCI_(5)` due to the formation of .A. free radicalB. carbanionC. carbeneD. carbocation

Ksp = [A]3 [B]2 for the salt where A and B are the cation and anion as the case may be stand true for:(a) Ca3 (PO4)2 (b) As2S3(c) Bi2S3 (d) All are correct

A saturated solution of calcium fluoride contains 2 x 10–4 mole of the salt per litre of the solution. Its Ksp is:(a) 8 x 10–18 (b) 3.2 x 10–11(c) 4 x 10–6 (d) 1.43 x 10–9

If the solubility of Pb3(PO4)2 is s mol per litre, then the solubility product of Pb3(PO4)2 will be:(a) 6s2 (b) 6s5(c) s5 (d) 108s5

Compare the stability of following carbanion?

The solubility of AgCl (Ksp = 1.2 x 10–10) in a 0.10 M NaCl solution is:(a) 0.1 M (b) 1.2 x 10–6 M(c) 1.2 x 10–9 M (d) 1.2 x 10–10 M

The 2 conformations shown below belongs to the compound cyclohexane. Infinite number of conformations are possible for cyclo hexane. But these 2 conformations given below has a peculiarity. Try to nd it. Also, dene the terms conformers and the phenomenon conformation?

Order of stability of given carbocation is(1) A &gt; B &gt; C(2) C &gt; B &gt; A(3) B &gt; A &gt; C(4) B &gt; C &gt; A

Arrange the following carbocation according to stability A. `R gt Q gt S gt P`B. `Q gt R gt P gt S`C. `Q gt R gt S gt P`D. `R gt Q gt P gt S`

in the above given compound how many functional group reduced by LAH (lithium aluminium hydride) and SBH (sodium Borohydride) respectively ?A. 4,4B. 4,3,C. 3,4D. 4,2

Which of the following alcohols gives a red colour in victor meyer test :-A. n- propyl alcoholB. isoproyl alcoholC. `(CH_(3))_(3)C-OH`D. Sec. Buty alcohol

Which of the following alcohol gives the white turbidity imediately with `HCl+ZnCl_(2)` (anhy.)?A. `CH_(3)-underset(OH)underset(|)overset(Ph) overset(|)(C)-OC_(2)H_(5)`B. `Ph-underset(OH)underset(|)(CH)-CH_(3)`C. `Ph-underset(OH)underset(|)(CH)-CH=CH_(2)`D. `CH_(3)-CH_(2)CH_(2)OH`

Which of the following alcohols gives the best yield of dialkyl ether on being heated with a trace of sulphuric acid? (1) 1-pentanol (2) 2-pentanol(3) cyclopentanol (4) 2-propano

Diethyl ether combines with CO under specific conditions to form `:`A. acetic acidB. carbon dioxideC. ethyl propanoateD. acetyl chloride

Diethyl ether by regareded as anhydride of :A. `C_2H_5COOH`B. `C_2H_5OH`C. `C_2H_5CHO`D. `C_2H_5COOC_2H_5`

Write the Arrhenius equation and mention what each term stands for.

Any two differences between lanthanides and Actinides.

What are antacids? Give an example.

Why is fluoroacetic acid a stronger acid than acetic acid?

What are the effects of the electron withdrawing and electron donating groups on acidity of carboxylic acids.

Under standered condition `Delta G^(@)` for the reaction `2Cr(s)= 3Cd^(2+)(aq) rarr 2Cr_((a a))^(3+) +3Cd(s)` is `(E_(Cr^(3+)//Cr)^(@) = - 0.74 V, E_(Cd^(2+)//Cd)^(@) = - 0.4 V)`A. `-65.62 J` moleB. `-196.86 kJ` moleC. `- 98.43 kJ` moleD. `-96.86 J `mole

Calculate the standard cell potentials of galvanic cell in whiCHM the following reactions take place `:` `a. Cr(s) +3Cd^(2+)(aq) rarr 2Cr^(3+)(aq)+3Cd` `b. Fe^(2+)(aq)+Ag^(o+)(aq)rarr Fe^(3+)(aq)+Ag(s)` Calculate the `Delta_(r)G^(c-)` and equilibrium constant of the reactions .

How can we improve the success rate of fertilisation during artificial insemination in animal husbandry programmes?

How are the colloidal solutions classified on the the basis of physical states of the dispersed phase and dispersion medium ?

Which of the following is a lanthanide ?A. CuriumB. CaliforniumC. UraniumD. Europium

The ionic radius of `._(57)La^(3+)` is 1.06Å. Which one of the following given values will be closest to the ionic radius of `._21Lu^(3+)`?A. 1.06ÅB. 1.56ÅC. 0.85ÅD. 1.35Å

I am a number between 31 and 41. I am a multiple of 3. I am an even number. What number am I?

An object starting from rest travels 20 m in the first 2s and 160 m in next 4s. What will be the velocity after 7s from the start?

What are the differences between Kinetic and Potential Energy?

Let `Delta^(2)` be the discriminant and `alpha,beta` be the roots of the equation `ax^(2)+bx+c=0` then `2aalpha+Delta` and `2abeta-Delta` can be roots of the equation.A. `x^(2)+2bx+b^(2)=0`B. `x^(2)-2bx+b^(2)=0`C. `x^(2)+2bx-3b^(2)+16ac=0`D. `x^(2)-2bx-3b^(2)+16ac=0`

A particle moves in xy plane with a velocity by `vec(v)=(8t-2)hat(i)+2hat(j)`. If it passes through the point (14, 4) at t = 2 sec, then give equation of the path.A. `x + y - y^(2) = 2`B. `y^(2)+x=4`C. `x-y-y^(2)=2`D. `y + x + y^(2)=2`

The velocity of a particle is given by `vec(v) = 2hat(i)-hat(j)+2hat(k)` in `m//s` for time interval `t = 0` to `t = 10` sec. If the distance travelled by the particle in given time interval `10n`, find value of `n` is.

Order of stability of given carbocation is(1) A > B > C(2) C > B > A(3) B > A > C(4) B > C > A