For an electrosynthesis of a substance, sign of ΔG and E_{cell} should be

- a)a
- b)b
- c)c
- d)d

Correct answer is option 'C'. Can you explain this answer?

Aadhar Academy answered • 9 hours ago

In the electrosynthesis (as electrolysis), ions are discharged at the electrodes thus, reverse reaction takes place.

Aniket Das asked • 6 minutes ago

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 ago

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)qL
^{2}ω/6 - b)qL
^{2}ω/12 - c)qL
^{2}ω/24 - d)qL
^{2}ω/36

Correct answer is option 'C'. Can you explain this answer?

Secret Superstar asked • 13 minutes ago

Aditya Dubey asked • 20 minutes ago

if then =

- a)
- b)
- c)
- d)

Correct answer is option 'D'. Can you explain this answer?

Rocky Saikia asked • 20 minutes ago

Subhadip Pal asked • 22 minutes ago

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

Correct answer is option 'A,C'. Can you explain this answer?

Joes Belarmine asked • 23 minutes ago

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

Correct answer is option 'C'. Can you explain this answer?

Josh Mathew asked • 36 minutes ago

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)

Correct answer is option 'C'. Can you explain this answer?

Harshita Agrawal asked • 50 minutes ago

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

Correct answer is option 'C'. Can you explain this answer?

Sonu Kumar asked • 54 minutes ago

If the polar w.r.t.y^{2} = 4ax touches the ellipse (x^{2}/α^{2}) + (y^{2}/β^{2})=1, the locus of its pole is

- a)(x
^{2}/α^{2}) - (y^{2})/(4a^{2}α^{2})/(β^{2}) = 1 - b)(α
^{2}x^{2}) + (β^{2}y^{2}) = 1 - c)(x
^{2}/α^{2}) + (β^{2}y^{2}/4a^{2}) = 1 - d)none of these

Correct answer is option 'A'. Can you explain this answer?

Danish Wajahath Wajahath asked • 1 hour ago

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 ago

Consider one mole of helium gas enclosed in a container at initial pressure P_{1 }and volume V_{1}. It expands isothermally to volume 4V_{1}. After this, the gas expands adiabatically and its volume becomes 32V_{1}. The work done by the gas during isothermal and adiabatic expansion processes are W_{iso} and W_{adia}, respectively. If the ratio ln 2, then f is ________.

Correct answer is between '1.77,1.78'. Can you explain this answer?

Navya Kaur asked • 2 hours ago

A 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 Aâ€™Bâ€™ undergo interference. The ratio Imax / Imin is

25% of incident energy is reflected. The rays AB and Aâ€™Bâ€™ 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?

Sonam Lodhi asked • 2 hours ago

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

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?

Sudeep Das asked • 2 hours ago

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)MLω
^{2}/2 - b)MLω
^{2} - c)MLω
^{2}/4 - d)ML
^{2}ω^{2}/2

Correct answer is option 'A'. Can you explain this answer?

Mansi Behl asked • 2 hours ago

The correct order of hybridisation of the central room atom in the following species, NH₃, [PtCl₄]^{2}⁻, PCl₅ and BCl₃ is respectively

- a)dsp
^{2}, dsp^{3}, sp^{2}, sp^{3} - b)sp
^{3}, dsp^{2}, dsp^{3}, sp^{2} - c)dsp
^{2}, sp^{2}, sp^{3}, dsp^{3} - d)dsp
^{2}, sp^{3}sp^{2}, dsp^{3}

Correct answer is option 'B'. Can you explain this answer?

Mansi Behl asked • 3 hours ago

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 10^{23}, h = 6.62 x 10^{-34}Js):

- a)1.49 x 10
^{3}nm - b)2.48 x 10
^{3}nm - c)2.48 x 10
^{4}nm - d)1.49 x 10
^{4}nm

Correct answer is option 'A'. Can you explain this answer?

Amrik Singh asked • 4 hours ago

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

Correct answer is option 'C'. Can you explain this answer?

Kusum Kumari asked • 4 hours ago

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

Correct answer is option 'D'. Can you explain this answer?

Mansi Behl asked • 5 hours ago

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

λ_{f}. 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

λ

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?

Pranjil Jain asked • 5 hours ago

Q. Given that the total charged stored in the *LC* circuit is *Q*_{0}, for t≥0, the charge on the capacitor is

Mansi Behl asked • 6 hours ago

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

Correct answer is option 'A'. Can you explain this answer?

Nandha Kizor asked • 6 hours ago

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 10
^{3}mol L⁻^{1}

Correct answer is option 'B'. Can you explain this answer?

Danish Wajahath Wajahath asked • 6 hours ago

An open-ended U-tube of uniform cross-sectional area contains water (density 10^{3}kg 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 (h_{1}/h_{2}) 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?

Pradeep Ahen asked • 6 hours ago

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
^{-5}N - b)4×10
^{-7}N - c)4×10
^{-5}N - d)4π×10
^{-7}N

Correct answer is option 'A'. Can you explain this answer?

Anwesha Rathee asked • 7 hours ago

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.

- a)6
- b)8
- c)15
- d)10

Correct answer is option 'D'. Can you explain this answer?

Pratham Kadian asked • 7 hours ago

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

- 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?

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?

Mansi Behl asked • 9 hours ago

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 × 10^{5} cm^{–1}, h = 6.6 × 10^{–34} Js, c = 3 × 10^{8} ms^{–1}]

[RH = 1 × 10

- a)Paschen, 5 → 3
- b)Paschen, ∞ → 3
- c)Lyman, ∞ → 1
- d)Balmer, ∞ → 2

Correct answer is option 'B'. Can you explain this answer?

Ajit Yadav asked • 9 hours ago

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, 1.12cm^{3} of H_{2}(g) measured over S.T.P. was found to adsorb per gram of charcoal. Consider only monolayer adsorption. Density of H_{2} is 0.07gm/cc. In another experiment same 1 gm charcoal adsorbs 100m1 of 0.5M CH_{3}COOH to form monolayer and thereby the polarity of CH_{3}COOH 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

Correct answer is option 'B'. Can you explain this answer?

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