JEE
For an electrosynthesis of a substance, sign of ΔG and Ecell should be
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'C'. Can you explain this answer?
For an electrosynthesis of a substance, sign of ΔG and Ecell should be
a)
a
b)
b
c)
c
d)
d
Aadhar Academy answered • 9 hours agoIn the electrosynthesis (as electrolysis), ions are discharged at the electrodes thus, reverse reaction takes place.
Aniket Das asked • 6 minutes agoPlease go through following and answer question no.7 to no.8Each of the following questions consists of five Problem figures marked 1,2,3,4 and 5 followed by five Answer figures marked A,B,C,D and E . Select a figure from the Answer figures which will continue the same series as given in the Problem figures.
... more
Please go through following and answer question no.7 to no.8
Each of the following questions consists of five Problem figures marked 1,2,3,4 and 5 followed by five Answer figures marked A,B,C,D and E . Select a figure from the Answer figures which will continue the same series as given in the Problem figures.
Abhishek Sood asked • 7 minutes agoA uniform rod of length L is charged uniformly with charge Q and is rotating about an axis passing through it's center and perpendicular to the rod with angular velcocity ω. Magnetic moment of the rod is,- a)qL2ω/6
- b)qL2ω/12
- c)qL2ω/24
- d)qL2ω/36
Correct answer is option 'C'. Can you explain this answer?
A uniform rod of length L is charged uniformly with charge Q and is rotating about an axis passing through it's center and perpendicular to the rod with angular velcocity ω. Magnetic moment of the rod is,
a)
qL2ω/6
b)
qL2ω/12
c)
qL2ω/24
d)
qL2ω/36
Secret Superstar asked • 13 minutes agoMod x 1 plus Mod x 3 is greater or equal to 3 so value of x is ?
Aditya Dubey asked • 20 minutes agoif 
then 
= - a)
- b)
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
then = a)
b)
c)
d)
Rocky Saikia asked • 20 minutes agoEnergy for 6.43 × 10^15 photons of 4.27×10^14 s^-1 frequency in einstein unit?
Subhadip Pal asked • 22 minutes agoIf y = f(x) be the equation of a parabola (the axis of the parabola being parallel to the y-axis) which is touched by the line y = x at x = 1, then- a)f ′ (1) = 1
- b)f ′ (0) = f ′ 1
- c)2 f (0) = 1 − f ′ (0)
- d)f (0) + f ′ (0) + f ″ (0) = 1
Correct answer is option 'A,C'. Can you explain this answer?
If y = f(x) be the equation of a parabola (the axis of the parabola being parallel to the y-axis) which is touched by the line y = x at x = 1, then
a)
f ′ (1) = 1
b)
f ′ (0) = f ′ 1
c)
2 f (0) = 1 − f ′ (0)
d)
f (0) + f ′ (0) + f ″ (0) = 1
Joes Belarmine asked • 23 minutes agoWhen a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same material and length but having a diameter half of the first one then the increase in length will be- a)0.5 cm
- b)2 cm
- c)4 cm
- d)8 cm
Correct answer is option 'C'. Can you explain this answer?
When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same material and length but having a diameter half of the first one then the increase in length will be
a)
0.5 cm
b)
2 cm
c)
4 cm
d)
8 cm
Ps Mandloi asked • 31 minutes ago
- a)s2
- b)(s−c)2
- c)(s−a)2
- d)(s−b)2
Correct answer is option 'A'. Can you explain this answer?
a)
s2
b)
(s−c)2
c)
(s−a)2
d)
(s−b)2
Josh Mathew asked • 36 minutes agoIn a system of particles 8 kg mass is subjected to a force of 16 N along +ve x−axis and another 8 kg mass is subjected to a force of 8 N along +ve y−axis. The magnitude of acceleration of centre of mass and the angle made by it with x−axis are given respectively by- a)√5/2ms-2,θ=45º
- b) 3√5ms-2,θ=tan-1(2/3)
- c)√5/2ms-2,θ=tan-1(1/2)
- d) 1ms-2,θ=tan-1(√3)
Correct answer is option 'C'. Can you explain this answer?
In a system of particles 8 kg mass is subjected to a force of 16 N along +ve x−axis and another 8 kg mass is subjected to a force of 8 N along +ve y−axis. The magnitude of acceleration of centre of mass and the angle made by it with x−axis are given respectively by
a)
√5/2ms-2,θ=45º
b)
3√5ms-2,θ=tan-1(2/3)
c)
√5/2ms-2,θ=tan-1(1/2)
d)
1ms-2,θ=tan-1(√3)
Harshita Agrawal asked • 50 minutes agoA small ball thrown with an initial velocity μ directed at an angle θ = 37° above the horizontal
collides inelastically (e = 1/4) with a vertical massive wall moving with a uniform horizontal
velocity u/5 towards ball. After collision with the wall, the ball returns to the point from where it
was thrown. Neglect friction between ball and wall. The time t from beginning of motion of the ball
till the moment of its impact with the wall is (tan37° = 3/4)- a)3μ/5g
- b)18μ/25g
- c)54μ/125g
- d)54μ/25g
Correct answer is option 'C'. Can you explain this answer?
A small ball thrown with an initial velocity μ directed at an angle θ = 37° above the horizontal
collides inelastically (e = 1/4) with a vertical massive wall moving with a uniform horizontal
velocity u/5 towards ball. After collision with the wall, the ball returns to the point from where it
was thrown. Neglect friction between ball and wall. The time t from beginning of motion of the ball
till the moment of its impact with the wall is (tan37° = 3/4)
collides inelastically (e = 1/4) with a vertical massive wall moving with a uniform horizontal
velocity u/5 towards ball. After collision with the wall, the ball returns to the point from where it
was thrown. Neglect friction between ball and wall. The time t from beginning of motion of the ball
till the moment of its impact with the wall is (tan37° = 3/4)
a)
3μ/5g
b)
18μ/25g
c)
54μ/125g
d)
54μ/25g
Danish Wajahath Wajahath asked • 1 hour agoA small roller of diameter 20 cm has an axle of diameter 10 cm (see figure below on the left). It is on a horizontal floor and a meter scale is positioned horizontally on its axle with one edge of the scale on top of the axle (see figure on the right). The scale is now pushed slowly on the axle so that it moves without slipping on the axle, and the roller starts rolling without slipping. After the roller has moved 50 cm, the position of the scale will look like (figures are schematic and not drawn to scale)- 
... more
A small roller of diameter 20 cm has an axle of diameter 10 cm (see figure below on the left). It is on a horizontal floor and a meter scale is positioned horizontally on its axle with one edge of the scale on top of the axle (see figure on the right). The scale is now pushed slowly on the axle so that it moves without slipping on the axle, and the roller starts rolling without slipping. After the roller has moved 50 cm, the position of the scale will look like (figures are schematic and not drawn to scale)-
Danish Wajahath Wajahath asked • 2 hours agoConsider one mole of helium gas enclosed in a container at initial pressure P1 and volume V1. It expands isothermally to volume 4V1. After this, the gas expands adiabatically and its volume becomes 32V1. The work done by the gas during isothermal and adiabatic expansion processes are Wiso and Wadia, respectively. If the ratio 
ln 2, then f is ________.
Correct answer is between '1.77,1.78'. Can you explain this answer?
Consider one mole of helium gas enclosed in a container at initial pressure P1 and volume V1. It expands isothermally to volume 4V1. After this, the gas expands adiabatically and its volume becomes 32V1. The work done by the gas during isothermal and adiabatic expansion processes are Wiso and Wadia, respectively. If the ratio ln 2, then f is ________.
ln 2, then f is ________. 
Navya Kaur asked • 2 hours agoA ray of light of intensity I is incident on a parallel glass-slab at point A as shown in figure. It undergoes partial reflection and refraction. At each reflection
25% of incident energy is reflected. The rays AB and A’B’ undergo interference. The ratio Imax / Imin is
- a)4 : 1
- b)8 : 1
- c)7 : 1
- d)49 : 1
Correct answer is option 'D'. Can you explain this answer?
25% of incident energy is reflected. The rays AB and A’B’ undergo interference. The ratio Imax / Imin is
a)
4 : 1
b)
8 : 1
c)
7 : 1
d)
49 : 1
Sonam Lodhi asked • 2 hours agoRadiation, with wavelength 6561 Å falls on a metal surface to produce photoelectrons. The electrons
are made to enter a uniform magnetic field of 3 × 10-4 T. If the radius of the largest circular path
followed by the electrons is 10 mm, the work function(in eV ) of the metal is close to- a)1.8
- b)0.8
- c)1.6
- d)1.1
Correct answer is option 'B'. Can you explain this answer?
Radiation, with wavelength 6561 Å falls on a metal surface to produce photoelectrons. The electrons
are made to enter a uniform magnetic field of 3 × 10-4 T. If the radius of the largest circular path
followed by the electrons is 10 mm, the work function(in eV ) of the metal is close to
are made to enter a uniform magnetic field of 3 × 10-4 T. If the radius of the largest circular path
followed by the electrons is 10 mm, the work function(in eV ) of the metal is close to
a)
1.8
b)
0.8
c)
1.6
d)
1.1
Sudeep Das asked • 2 hours agoA tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by the liquid at the other end is- a)MLω2/2
- b)MLω2
- c)MLω2/4
- d)ML2ω2/2
Correct answer is option 'A'. Can you explain this answer?
A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by the liquid at the other end is
a)
MLω2/2
b)
MLω2
c)
MLω2/4
d)
ML2ω2/2
Mansi Behl asked • 2 hours agoThe correct order of hybridisation of the central room atom in the following species, NH₃, [PtCl₄]2⁻, PCl₅ and BCl₃ is respectively- a)dsp2, dsp3, sp2, sp3
- b)sp3, dsp2, dsp3, sp2
- c)dsp2, sp2, sp3, dsp3
- d)dsp2, sp3 sp2, dsp3
Correct answer is option 'B'. Can you explain this answer?
The correct order of hybridisation of the central room atom in the following species, NH₃, [PtCl₄]2⁻, PCl₅ and BCl₃ is respectively
a)
dsp2, dsp3, sp2, sp3
b)
sp3, dsp2, dsp3, sp2
c)
dsp2, sp2, sp3, dsp3
d)
dsp2, sp3 sp2, dsp3
and A1 , B1 , C1 etc are cofactors of a 1 , b 1 , c 1 , then 
Mansi Behl asked • 3 hours agoThe heat of atomization of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro number = 6.02 x 1023, h = 6.62 x 10-34Js):- a)1.49 x 103 nm
- b)2.48 x 103 nm
- c)2.48 x 104 nm
- d)1.49 x 104 nm
Correct answer is option 'A'. Can you explain this answer?
The heat of atomization of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro number = 6.02 x 1023, h = 6.62 x 10-34Js):
a)
1.49 x 103 nm
b)
2.48 x 103 nm
c)
2.48 x 104 nm
d)
1.49 x 104 nm
Amrik Singh asked • 4 hours agoTwo magnets are dropped along the axis of two metallic tubes of finite length. One is of copper and the other of iron. Then,- a)magnet will come out from both the tubes simultaneously
- b)magnet will take longer time to travel through iron tube than copper tube
- c)magnet will take longer time to travel through copper tube than iron tube
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Two magnets are dropped along the axis of two metallic tubes of finite length. One is of copper and the other of iron. Then,
a)
magnet will come out from both the tubes simultaneously
b)
magnet will take longer time to travel through iron tube than copper tube
c)
magnet will take longer time to travel through copper tube than iron tube
d)
None of these
Then the angle subtended by QR at origin is 
Kusum Kumari asked • 4 hours agoThe theory that links thermodynamics with chemical kinetics is__- a)Simple collision theory
- b)Modified simple collision theory with the introduction of the steric factor
- c)Arrhenius theory
- d)Absolute reaction rate theory
Correct answer is option 'D'. Can you explain this answer?
The theory that links thermodynamics with chemical kinetics is__
a)
Simple collision theory
b)
Modified simple collision theory with the introduction of the steric factor
c)
Arrhenius theory
d)
Absolute reaction rate theory
Mansi Behl asked • 5 hours agoColumn I shows four systems, each of the same length L, for producing standing waves. The lowest
possible natural frequency of a system is called its fundamental frequency, whose wavelength is denoted as
λf. Match each system with statements given in Column II describing the nature and wavelength of the
standing waves.
- a)(A) → (p, t)(B) → (p, r)(C) → (q, r)(D) → (r)
- b)(A) → (q, t)(B) → (s)(C) → (r, s)(D) → (q, r)
- c)(A) → (q, t)(B) → (r, s)(C) → (s)(D) → (p, q, r)
- d)(A) → (p, t)(B) → (p, s)(C) → (q, s)(D) → (q, r)
Correct answer is option 'D'. Can you explain this answer?
Column I shows four systems, each of the same length L, for producing standing waves. The lowest
possible natural frequency of a system is called its fundamental frequency, whose wavelength is denoted as
λf. Match each system with statements given in Column II describing the nature and wavelength of the
standing waves.
possible natural frequency of a system is called its fundamental frequency, whose wavelength is denoted as
λf. Match each system with statements given in Column II describing the nature and wavelength of the
standing waves.
a)
(A) → (p, t)
(B) → (p, r)
(C) → (q, r)
(D) → (r)
b)
(A) → (q, t)
(B) → (s)
(C) → (r, s)
(D) → (q, r)
c)
(A) → (q, t)
(B) → (r, s)
(C) → (s)
(D) → (p, q, r)
d)
(A) → (p, t)
(B) → (p, s)
(C) → (q, s)
(D) → (q, r)
Pranjil Jain asked • 5 hours agoIn the given circuit the capacitor (C) may be charged through resistance R by battery V by closing switch S1. Also when S1 is opened and S2 is closed the capacitor is connected in series with inductor (L).
Q. Given that the total charged stored in the LC circuit is Q0, for t≥0, the charge on the capacitor is... more
In the given circuit the capacitor (C) may be charged through resistance R by battery V by closing switch S1. Also when S1 is opened and S2 is closed the capacitor is connected in series with inductor (L).
Q. Given that the total charged stored in the LC circuit is Q0, for t≥0, the charge on the capacitor is
Mansi Behl asked • 6 hours agoOne of the most powerful formulae used in nuclear physics laboratories is the Lorentz force formula applied in cyclotrons, mass spectrographs and identification of fundamental particle.If only a magnetic field is applied to a charge moving with velocity v, the force is given by F = qv×BQ. The force acting on a charge at rest due to a powerful magnetic field is- a)Zero
- b)will be having high acceleration
- c)depends on the direction of the field
- d)none of these
Correct answer is option 'A'. Can you explain this answer?
One of the most powerful formulae used in nuclear physics laboratories is the Lorentz force formula applied in cyclotrons, mass spectrographs and identification of fundamental particle.If only a magnetic field is applied to a charge moving with velocity v, the force is given by F = qv×B
Q. The force acting on a charge at rest due to a powerful magnetic field is
a)
Zero
b)
will be having high acceleration
c)
depends on the direction of the field
d)
none of these
Nandha Kizor asked • 6 hours agoFor a reaction 2N₂O₅ → 4NO₂ + O₂ rate and rate constant are 1.02 x 10-4 mol L⁻1 s⁻1 and 3.4 x 10-5 sec⁻1. The conc. of N₂O₅ at that time will be- a)1.732 mol L⁻1
- b)3 mol L⁻1
- c)1.02 x 10⁻1 mol L⁻1
- d)3.3 x 103 mol L⁻1
Correct answer is option 'B'. Can you explain this answer?
For a reaction 2N₂O₅ → 4NO₂ + O₂ rate and rate constant are 1.02 x 10-4 mol L⁻1 s⁻1 and 3.4 x 10-5 sec⁻1. The conc. of N₂O₅ at that time will be
a)
1.732 mol L⁻1
b)
3 mol L⁻1
c)
1.02 x 10⁻1 mol L⁻1
d)
3.3 x 103 mol L⁻1
Danish Wajahath Wajahath asked • 6 hours agoAn open-ended U-tube of uniform cross-sectional area contains water (density 103kg m−3). Initially the water level stands at 0.29 m from the bottom in each arm. Kerosene oil (a water-immiscible liquid) of density 800 kg m−3 is added to the left arm until its length is 0.1 m, as shown in the schematic figure below. The ratio (h1/h2) of the heights of the liquid in the two arms is- 
- a)15/14
- b)35/33
- c)7/6
- d)5/4
Correct answer is option 'B'. Can you explain this answer?
An open-ended U-tube of uniform cross-sectional area contains water (density 103kg m−3). Initially the water level stands at 0.29 m from the bottom in each arm. Kerosene oil (a water-immiscible liquid) of density 800 kg m−3 is added to the left arm until its length is 0.1 m, as shown in the schematic figure below. The ratio (h1/h2) of the heights of the liquid in the two arms is-
a)
15/14
b)
35/33
c)
7/6
d)
5/4
Pradeep Ahen asked • 6 hours agoThrough two parallel wires A and B, 10 and 2 ampere of currents are passed respectively in opposite direction. If the wire A is infinitely long and the length of the wire B is 2 m, the force on the conductor B, which is situated at 10 cm distance from A will be [CPMT 1988; MP PMT 1994]- a) 8×10-5N
- b) 4×10-7N
- c) 4×10-5N
- d) 4π×10-7N
Correct answer is option 'A'. Can you explain this answer?
Through two parallel wires A and B, 10 and 2 ampere of currents are passed respectively in opposite direction. If the wire A is infinitely long and the length of the wire B is 2 m, the force on the conductor B, which is situated at 10 cm distance from A will be [CPMT 1988; MP PMT 1994]
a)
8×10-5N
b)
4×10-7N
c)
4×10-5N
d)
4π×10-7N
Anwesha Rathee asked • 7 hours agoCoordinate of the vertices B and C of triangle ABC are respectively (2, 0) and (8, 0). The vertex ‘A’ is varying in such a way that 
Then the locus of ‘A’ is an ellipse whose major axis is of length. - a)6
- b)8
- c)15
- d)10
Correct answer is option 'D'. Can you explain this answer?
Coordinate of the vertices B and C of triangle ABC are respectively (2, 0) and (8, 0). The vertex ‘A’ is varying in such a way that Then the locus of ‘A’ is an ellipse whose major axis is of length.
Then the locus of ‘A’ is an ellipse whose major axis is of length. a)
6
b)
8
c)
15
d)
10
Pratham Kadian asked • 7 hours agoFrom any point P lying in first quadrant on the ellipse 
PN is drawn perpendicular to the major axis and produced at Q so that NQ equals to PS, where S is a focus. Then the locus of Q is - a)5y - 3x - 25 = 0
- b)3x + 5y+ 25 = 0
- c)3x - 5y- 25 = 0
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
From any point P lying in first quadrant on the ellipse PN is drawn perpendicular to the major axis and produced at Q so that NQ equals to PS, where S is a focus. Then the locus of Q is
PN is drawn perpendicular to the major axis and produced at Q so that NQ equals to PS, where S is a focus. Then the locus of Q is a)
5y - 3x - 25 = 0
b)
3x + 5y+ 25 = 0
c)
3x - 5y- 25 = 0
d)
None of these
Kannikanti Pardha Saradh asked • 7 hours ago A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/s. A plumb bob is suspended from the roof of the car by a light rigid rod. The angle made by the rod with the vertical is (Take g= 10 m/s²) - a)60°
- b)45°
- c)30°
- d)zero
Correct answer is option 'B'. Can you explain this answer?
A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/s. A plumb bob is suspended from the roof of the car by a light rigid rod. The angle made by the rod with the vertical is (Take g= 10 m/s²)
a)
60°
b)
45°
c)
30°
d)
zero
is a polynomial in x of degree -
Mansi Behl asked • 9 hours agoHeat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H-atom is suitable for this purpose?
[RH = 1 × 105 cm–1, h = 6.6 × 10–34 Js, c = 3 × 108 ms–1]- a)Paschen, 5 → 3
- b)Paschen, ∞ → 3
- c)Lyman, ∞ → 1
- d)Balmer, ∞ → 2
Correct answer is option 'B'. Can you explain this answer?
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H-atom is suitable for this purpose?
[RH = 1 × 105 cm–1, h = 6.6 × 10–34 Js, c = 3 × 108 ms–1]
[RH = 1 × 105 cm–1, h = 6.6 × 10–34 Js, c = 3 × 108 ms–1]
a)
Paschen, 5 → 3
b)
Paschen, ∞ → 3
c)
Lyman, ∞ → 1
d)
Balmer, ∞ → 2
Ajit Yadav asked • 9 hours agoAdsorption is the presence of excess concentration of any particular component at the surface of liquid or solid phase as compared to bulk. This is due to presence of residual forces at the surface of body. In the adsorption of hydrogen gas over a sample, of charcoal, 1.12cm3 of H2(g) measured over S.T.P. was found to adsorb per gram of charcoal. Consider only monolayer adsorption. Density of H2 is 0.07gm/cc. In another experiment same 1 gm charcoal adsorbs 100m1 of 0.5M CH3COOH to form monolayer and thereby the polarity of CH3COOH reduces to 0.49.(3 x 47.73 )1/347t =2.24.(2.24)2 = 5Q.What is the radius of adsorb hydrogen molecule- a)2.24 x 10-7 cm
- b)2.24 x 10-5 cm
- c)2.24 x 10-gcm
- d)2.24 x 10-15cm
Correct answer is option 'B'. Can you explain this answer?
Adsorption is the presence of excess concentration of any particular component at the surface of liquid or solid phase as compared to bulk. This is due to presence of residual forces at the surface
of body. In the adsorption of hydrogen gas over a sample, of charcoal, 1.12cm3 of H2(g) measured over S.T.P. was found to adsorb per gram of charcoal. Consider only monolayer adsorption. Density of H2 is 0.07gm/cc. In another experiment same 1 gm charcoal adsorbs 100m1 of 0.5M CH3COOH to form monolayer and thereby the polarity of CH3COOH reduces to 0.49.
(3 x 47.73 )1/3
47t =2.24.
(2.24)2 = 5
Q.
What is the radius of adsorb hydrogen molecule
a)
2.24 x 10-7 cm
b)
2.24 x 10-5 cm
c)
2.24 x 10-gcm
d)
2.24 x 10-15cm
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