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A parallel plate capacitor has a capacitance C and charge Q. Another plate is inserted in between the plates of the capacitor at the center and is connected by a long wire to another far off spherical conductor of radius R. What is the potential difference between the edge of the sphere and one of the outer plates ?

Anonymous User Physics Capacitors 19 Jan, 2021 0 Answer 82 views

In is the midpoint of BC. E is the foot of the perpendicular from A to BC (lie on BC), and F is the foot of the perpendicular from D to AC. Given that BC=5,EC=9 and the area of triangle ABC is 84. Then the value of EF is

Anonymous User Maths 27 Dec, 2020 0 Answer 65 views

In is the midpoint of BC. E is the foot of the perpendicular from A to BC (lie on BC), and F is the foot of the perpendicular from D to AC. Given that BC=5,EC=9 and the area of triangle ABC is 84. Then the value of EF is

Anonymous User Maths 27 Dec, 2020 1 Answer 83 views

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range?

Anonymous User Physics 20 Nov, 2020 1 Answer 82 views

A body of mass m = 3.513 kg is moving along the x-axis with a speed of 5.00 ms−1. The magnitude of its momentum is recorded as ?

Anonymous User Physics 20 Nov, 2020 1 Answer 82 views

While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, she measures the column length to be x cm for the second resonance. Then

While measuring the speed of sound by performing a resonance column experiment, a student gets
the first resonance condition at a column length of 18 cm during winter. Repeating the same
experiment during summer, she measures the column length to be x cm for the second resonance.
Then

(1) 18 > x
(2) x >54
(3) 54 > x > 36
(4) 36 > x > 18

Anonymous User Physics 20 Nov, 2020 1 Answer 83 views

Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

(1) gets oxidised by oxalic acid to chlorine
(2) furnishes H+ ions in addition to those from oxalic acid
(3) reduces permanganate to Mn2+
(4) oxidises oxalic acid to carbon dioxide and water

Anonymous User Chemistry 18 Nov, 2020 1 Answer 67 views

At 80 C, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80 C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

At 80 C, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm
Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80 C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

Anonymous User Chemistry 18 Nov, 2020 1 Answer 69 views

Sodium ethoxide has reacted with ethanoyl chloride. The compound that is produced in the above reaction is?

Anonymous User Chemistry 12 Nov, 2020 1 Answer 66 views

A man saves Rs. 200 in each of the first three months of his service. In each of the subsequent months his saving increases by Rs. 40 more than the saving of immediately previous month. His total saving from the start of service will be Rs. 11040 after?

A man saves Rs. 200 in each of the first three months of his service. In each of the subsequent months his saving increases by Rs. 40 more than the saving of immediately previous month. His total saving from
the start of service will be Rs. 11040 after?

Anonymous User Maths 12 Nov, 2020 1 Answer 75 views

100g of water is heated from 30C to 50C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4148 J/kg/K):

Anonymous User Physics 11 Nov, 2020 1 Answer 76 views

The half life of a radioactive substance is 20 minutes. The approximate time interval (t 2- t1 ) between the time t2 when 2/3 of it has decayed and time t1 and 1/3 of it had decayed is :

The half life of a radioactive substance is 20 minutes. The approximate time interval (t 2- t1 ) between
the time t2 when 2/3 of it has decayed and time t1 and 1/3 of it had decayed is :

Anonymous User Physics 11 Nov, 2020 1 Answer 64 views

Energy required for the electron excitation in Li++ from the first to the third Bohr orbit is ?

Anonymous User Physics 11 Nov, 2020 1 Answer 59 views

A car is fitted with a convex side-view mirror of focal length 20cm. A second car 2.8 m behind the first car is overtaking the first car at relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is?

A car is fitted with a convex side-view mirror of focal length 20cm. A second car 2.8 m behind the first car is overtaking the first car at relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is?

Anonymous User Physics Ray Optics 11 Nov, 2020 1 Answer 67 views

The radii r1, r2, r3 of escribed circles of a triangle ABC are in harmonic progression. If its area is 24 sq. cm and its perimeter is 24 cm, find the lengths of its sides?

Anonymous User Maths Trigonometry 10 Nov, 2020 1 Answer 92 views

A six faced fair dice is thrown until 1 comes, then the probability that 1 comes in even number of trials is?

Anonymous User Maths Probability 10 Nov, 2020 1 Answer 66 views

Two cards are drawn at random from a pack of playing cards. Find the probability that one card is a heart and the other is an ace?

Anonymous User Maths Probability 03 Nov, 2020 1 Answer 65 views

A pressure cooker reduces cooking time for food because:

Anonymous User Chemistry 01 Nov, 2020 1 Answer 57 views

The enthalpy change for a reaction does not depend upon the:

Anonymous User Chemistry 01 Nov, 2020 1 Answer 58 views

If at 298K the bond energies of C--H, C-C, C = C, and H-H bonds are respectively 414, 347, 615, and 435 kJ mol^-1. The value of enthalpy change for the reaction

H₂C = CH₂(g) + H₂(g) -->H₃C - CH3₃(g) at 298K will be:

Anonymous User Chemistry 01 Nov, 2020 1 Answer 63 views

The correct relationship between free energy change in a reaction and the corresponding equilibrium constant K_c is :

Anonymous User Chemistry 01 Nov, 2020 1 Answer 62 views

25mL of a solution of barium hydroxide on titration with 0.1 molar solution of hydrochloric acid gave a titer value of 35 mL. The molarity of barium hydroxide solution was :

Anonymous User Chemistry 01 Nov, 2020 1 Answer 62 views

The rate law for a reaction between the substances A and B is given by rate = k [A]ⁿ[B]^m. On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of the reaction will be as :

Anonymous User Chemistry 01 Nov, 2020 1 Answer 58 views

In a 0.2 molal aqueous solution of a weak acid H X, the degree of ionization is 0.3. Taking K_f for water as 1.85, the freezing point of the solution will be nearest to:

Anonymous User Chemistry 01 Nov, 2020 1 Answer 63 views

For the redox reaction

Zn(s) + cu²⁺ (0.1 M) --> Zn²⁺ (1M) + Cu(s)

taking place in a cell, E⁰_cell is 1.10 volt. E_cell for the cell will be:

Anonymous User Chemistry 01 Nov, 2020 1 Answer 50 views

Question & Answer

In the anion HCOO- the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?

Which one of the following groupings represents a collection of isoelectronic species? (At. numbers : Cs-55, Br-35)

Which of the following pairs of molecules will have permanent dipole moments for both members?

Which one of the following compounds has the smallest bond angle in its molecule?

Which one of the following processes will produce hard water?

Among the following four structures I to IV, which one is true?

Ether is more volatile than alcohol having the same molecular formula. This is due to

The general formula CnH2nO2 could be for open-chain:

Which of the following group of transition metals is called coinage metals?

According to the kinetic theory of gases in an ideal gas, between two successive collisions a gas molecule travels:

When is reduced with LiAlH4, the compound obtained will be

The IUPAC name of CH3COCH(CH3)2 is

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anamalous behavior is that :

According to the periodic law of elements, the variation in properties of elements is related to their:

In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n − 1). If n >> 1, the frequency of radiation emitted is proportional to :

An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism :

Experimentally it was found that a metal oxide has formula M0.98O. Metal M, is present as M2+ and M3+ in its oxide. Fraction of the metal which exists as M3+ would be :

All the students of a class performed poorly in Mathematics. The teacher decided to give grace marks of 10 to each of the students. Which of the following statistical measures will not change even after the grace marks were given ?

If

Let Tn be the number of all possible triangles formed by joining vertices of a n−sided regular polygon.IfTn+1 −Tn =1then the value of n is:

The area (in square units) bounded by the curves x -axis, laying in the first quadrant

The x−coordinate of the incentre of the triangle that has the coordinates of mid points of its sides as (0, 1) (1, 1) and (1, 0) is :

A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answers just by guessing is :

If x, y, z are in A.P. and tan^−1x, tan^−1y and tan^−1z are also in A.P., then :

Find the probability of 4 turning up for at least once in two tosses of a fair die?

In is the midpoint of BC. E is the foot of the perpendicular from A to BC (lie on BC), and F is the foot of the perpendicular from D to AC. Given that BC=5,EC=9 and the area of triangle ABC is 84. Then the value of EF is

In is the midpoint of BC. E is the foot of the perpendicular from A to BC (lie on BC), and F is the foot of the perpendicular from D to AC. Given that BC=5,EC=9 and the area of triangle ABC is 84. Then the value of EF is

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range?

A body of mass m = 3.513 kg is moving along the x-axis with a speed of 5.00 ms−1. The magnitude of its momentum is recorded as ?

While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, she measures the column length to be x cm for the second resonance. Then

Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

At 80 C, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80 C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

Sodium ethoxide has reacted with ethanoyl chloride. The compound that is produced in the above reaction is?

A man saves Rs. 200 in each of the first three months of his service. In each of the subsequent months his saving increases by Rs. 40 more than the saving of immediately previous month. His total saving from the start of service will be Rs. 11040 after?

100g of water is heated from 30C to 50C. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4148 J/kg/K):

The half life of a radioactive substance is 20 minutes. The approximate time interval (t 2- t1 ) between the time t2 when 2/3 of it has decayed and time t1 and 1/3 of it had decayed is :

Energy required for the electron excitation in Li++ from the first to the third Bohr orbit is ?

A car is fitted with a convex side-view mirror of focal length 20cm. A second car 2.8 m behind the first car is overtaking the first car at relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is?

The radii r1, r2, r3 of escribed circles of a triangle ABC are in harmonic progression. If its area is 24 sq. cm and its perimeter is 24 cm, find the lengths of its sides?

A six faced fair dice is thrown until 1 comes, then the probability that 1 comes in even number of trials is?

Two cards are drawn at random from a pack of playing cards. Find the probability that one card is a heart and the other is an ace?

A pressure cooker reduces cooking time for food because:

The enthalpy change for a reaction does not depend upon the:

If at 298K the bond energies of C--H, C-C, C = C, and H-H bonds are respectively 414, 347, 615, and 435 kJ mol-1. The value of enthalpy change for the reaction H2C = CH2(g) + H2(g) -->H3C - CH33(g) at 298K will be:

The correct relationship between free energy change in a reaction and the corresponding equilibrium constant Kc is :

25mL of a solution of barium hydroxide on titration with 0.1 molar solution of hydrochloric acid gave a titer value of 35 mL. The molarity of barium hydroxide solution was :

The rate law for a reaction between the substances A and B is given by rate = k [A]n[B]m. On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of the reaction will be as :

In a 0.2 molal aqueous solution of a weak acid H X, the degree of ionization is 0.3. Taking Kf for water as 1.85, the freezing point of the solution will be nearest to:

For the redox reaction Zn(s) + cu2+ (0.1 M) --> Zn2+ (1M) + Cu(s) taking place in a cell, E0cell is 1.10 volt. Ecell for the cell will be:

In the anion HCOO^- the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?

Which one of the following groupings represents a collection of isoelectronic species?

(At. numbers : Cs-55, Br-35)

The general formula C_nH_2nO₂ could be for open-chain:

When is reduced with LiAlH₄, the compound obtained will be

The IUPAC name of CH₃COCH(CH₃)₂ is

If $y\, =\, sec\, \left ( {{tan}^{-1}\, x} \right ),\, then\, \frac {dy} {dx}\, \, at\, x\, =\, 1\, is\, equal\, to\, :$

The area (in square units) bounded by the curves

$y\, =\, \sqrt {x},\, 2y\, -x\, +3\, =\, 0$

x -axis, laying in the first quadrant

If at 298K the bond energies of C--H, C-C, C = C, and H-H bonds are respectively 414, 347, 615, and 435 kJ mol^-1. The value of enthalpy change for the reaction

H₂C = CH₂(g) + H₂(g) -->H₃C - CH3₃(g) at 298K will be:

The correct relationship between free energy change in a reaction and the corresponding equilibrium constant K_c is :

The rate law for a reaction between the substances A and B is given by rate = k [A]ⁿ[B]^m. On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of the reaction will be as :

In a 0.2 molal aqueous solution of a weak acid H X, the degree of ionization is 0.3. Taking K_f for water as 1.85, the freezing point of the solution will be nearest to:

For the redox reaction

Zn(s) + cu²⁺ (0.1 M) --> Zn²⁺ (1M) + Cu(s)

taking place in a cell, E⁰_cell is 1.10 volt. E_cell for the cell will be: