(1) (A) is correct but (R) is not correct
(2) Both (A) and (R) are correct but (R) is not the
correct explanation of (A)
(3) Both (A) and (R) are correct and (R) is the
correct explanation of (A)
(4) (A) is not c [Read More]

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A sinusoidal wave of wavelength 7.5 cm travels a distance of 1.2 cm along the x-direction in 0.3 sec. The crest P is at x = 0 at t = 0 sec and maximum displacement of the wave is 2 cm. Which equation correctly represents this wave ?

(1) y = 2cos(0.83x – 3.35t) cm
(2) y = 2sin(0.83x – 3.5t) cm
(3) y = 2cos(3.35x – 0.83t) cm
(4) y = 2cos(0.13x – 0.5t) cm

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Identify the characteristics of an adiabatic process in a monoatomic gas.

(A) Internal energy is constant.
(B) Work done in the process is equal to the charge
in internal energy.
(C) The product of temperature and volume is a
constant.
(D) The product of pressure and volume is a
[Read More]

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Two identical objects are placed in front of convex mirror and concave mirror having same radii of curvature of 12 cm, at same distance of 18 cm from the respective mirrors. The ratio of sizes of the images formed by convex mirror and by concave mirror is :

(1) 1/2 (2) 2
(3) 3 [Read More]

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Match List-I with List-II. List-I List-II (A) Heat capacity of body (I) J kg–1 (B) Specific heat capacity of body (II) JK–1 (C) Latent heat (III) J kg–1 K–1 (D)Thermal conductivity (IV) Jm–1K–1s–1 Choose the correct answer from the options given below :

(1) (A)–(III), (B)–(I), (C)–(II), (D)–(IV)
(2) (A)–(IV), (B)–(III), (C)–(II), (D)–(I)
(3) (A)–(III), (B)–(IV), (C)–(I), (D)–(II)
(4) (A)–(II), (B)&n [Read More]

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A bi–convex lens has radius of curvature of both the surfaces same as 1/6 cm. If this lens is required to be replaced by another convex lens having different radii of curvatures on both sides (R1  R2), without any change in lens power then possible combination of R1 and R2 is :

(1) 1/3 cm and 1/3 cm (2) 1/5 cm and 1/7 cm

(3) 1/3 cm and 1/7 cm [Read More]

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A satellite of mass 1000 kg is launched to revolve around the earth in an orbit at a height of 270 km from the earth's surface. Kinetic energy of the satellite in this orbit is × 10¹⁰ J. (Mass of earth = 6 × 10²⁴ kg, Radius of earth = 6.4 × 10⁶ m, Gravitational constant = 6.67 × 10–¹¹ Nm² kg–²)

.

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

During the melting of a slab of ice at 273 K at atmospheric pressure :

(1) Internal energy of ice-water system remains
unchanged.
(2) Positive work is done by the ice-water system
on the atmosphere.
(3) Internal energy of the ice-water system
decreases.
(4) Positive work is d [Read More]

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Consider a completely full cylindrical water tank of height 1.6 m and cross-sectional area 0.5 m2. It has a small hole in its side at a height 90 cm from the bottom. Assume, the cross-sectional area of the hole to be negligibly small as compared to that of the water tank. If a load 50 kg is applied at the top surface of the water in the tank then the velocity of the water coming out at the instant when the hole is opened is : (g = 10 m/s2)

(1) 3 m/s (2) 5 m/s
(3) 2 m/s (4) 4 m/s

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A 4.0 cm long straight wire carrying a current of 8A is placed perpendicular to an uniform magnetic field of strength 0.15 T. The magnetic force on the wire is__________mN.

.

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A loop ABCDA, carrying current I = 12 A, is placed in a plane, consists of two semi-circular segments of radius R₁ = 6π m and R₂ = 4 π m. The magnitude of the resultant magnetic field at center O is k × 10–⁷ T. The value of k is__________. (Given μ₀ = 4π × 10–⁷ Tm A–¹)

.

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Three identical spheres of mass m, are placed at the vertices of an equilateral triangle of length a. When released, they interact only through gravitational force and collide after a time T = 4 seconds. If the sides of the triangle are increased to length 2a and also the masses of the spheres are made 2m, then they will collide after ______ seconds.

.

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Two coherent monochromatic light beams of intensities 4I and 9I are superimposed. The difference between the maximum and minimum intensities in the resulting interference pattern is xI. The value of x is __________ .

.

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

consider following statements for refraction of light through prism, when angle of deviation is minimum. (A) The refracted ray inside prism becomes parallel to the base. (B) Larger angle prisms provide smaller angle of minimum deviation. (C) Angle of incidence and angle of emergence becomes equal. (D) There are always two sets of angle of incidence for which deviation will be same except at minimum deviation setting. (E) Angle of refraction becomes double of prism angle. Choose the correct answer from the options given below.

(1) A, C and D Only (2) B, C and D Only
(3) A, B and E Only (4) B, D and E Only

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

The radii of curvature for a thin convex lens are 10 cm and 15 cm respectively. The focal length of the lens is 12 cm. The refractive index of the lens material is

(1) 1.2
(2) 1.4
(3) 1.5
(4) 1.8

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A person measures mass of 3 different particles as 435.42 g, 226.3 g and 0.125 g. According to the rules for arithmetic operations with significant figures, the additions of the masses of 3 particles will be.

(1) 661.845 g
(2) 662 g
(3) 661.8 g
(4) 661.84 g

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

The electrostatic potential on the surface of uniformly charged spherical shell of radius R = 10 cm is 120 V. The potential at the centre of shell, at a distance r = 5 cm from centre, and at a distance r = 15 cm from the centre of the shell respectively, are:

(1) 120V, 120V, 80V (2) 40V, 40V, 80V
(3) 0V, 0V, 80V (4) 0V, 120V, 40V

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

The work function of a metal is 3 eV. The color of the visible light that is required to cause emission of photoelectrons is

(1) Green (2) Blue
(3) Red (4) Yellow

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A gas is kept in a container having walls which are thermally non-conducting. Initially the gas has a volume of 800 cm3 and temperature 27°C. The change in temperature when the gas is adiabatically compressed to 200 cm3 is : (Take  = 1.5 :  is the ratio of specific heats at constant pressure and at constant volume)

(1) 327 K

(2) 600 k

(3) 522 k

(4) 300 k

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Which of the following postulate of Bohr's model of hydrogen atom in not in agreement with quantum mechanical model of an atom ?

(1) An atom in a stationary state does not emit
electromagnetic radiation as long as it stays in
the same state
(2) An atom can take only certain distinct energies
E1, E2, E3, etc. These allowed states of constant
[Read More]

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Given below are two statements Statement I : The N–N single bond is weaker and longer than that of P–P single bond Statement II : Compounds of group 15 elements in +3 oxidation states readily undergo disproportionation reactions. In the light of above statements, choose the correct answer from the options given below :

(1) Statement I is true but statement II is false
(2) Both statement I and statement II are false
(3) Statement I is false but statement II is true
(4) Both statement I and satetement II are true

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Given below are two statements Statement I : A catalyst cannot alter the equilibrium constant (KC) of the reaction, temperature remaining constant Statement II : A homogenous catalyst can change the equilibrium composition of a system temperature remaining constant In the light of the above statements, choose the correct answer from the options given below

(1) Statement I is false but Statement II is true
(2) Both Statement I and Statement II are true
(3) Both Statement I and Statement II is false
(4) Statement I is true but Statement II is false

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

In a reaction A + B  C, initial concentrations of A and B are related as [A]0 = 8[B]0. The half lives of A and B are 10 min and 40 min. respectively. If they start to disappear at the same time, both following first order kinetics, after how much time will the concentration of both the reactants be same?

(1) 60 min (2) 80 min
(3) 20 min (4) 40 min

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Among 10–9 g (each) of the following elements, which one will have the highest number of atoms? Element : Pb, Po, Pr and Pt

(1) Po
(2) Pr
(3) Pb
(4) Pt

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Which of the following statements are correct? A. The process of the addition an electron to a neutral gaseous atom is always exothermic B. The process of removing an electron from an isolated gaseous atom is always endothermic C. The 1st ionization energy of the boron is less than that of the beryllium D. The electronegativity of C is 2.5 in CH4 and CCl4 E. Li is the most electropositive among elements of group I Choose the correct answer from the options gives below

(1) B and C only
(2) A, C and D only
(3) B and D only
(4) B, C and E only

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Number of molecules from below which cannot give ioddoform reaction is : Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol

(1) 5
(2) 4
(3) 3
(4) 2

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

2 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is : (Given : Ebullioscopic constant of water = 0.52 K kg mol–1)

(1) 379.2 K
(2) 377.3 K
(3) 375.3 K
(4) 277.3 k

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

An ideal gas exists in a state with pressure P0, volume V0.It is isothermally expanded to 4 times of its initial volume (V0), then isobarically compressed to its original volume. Finally the system is heated isochorically to bring it to its initial state. The amount of heat exchanged in this process is :

(1) P0V0(2ln 2 – 0.75) (2) P0V0(ln 2 – 0.75)
(3) P0V0(ln 2 – 0.25) (4) P0V0(2ln 2 – 0.25)

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The Bohr model is applicable to hydrogen and hydrogen-like atoms only. Reason R : The formulation of Bohr model does not include repulsive force between electrons. In the light of the above statements, choose the correct answer from the options given below :

(1) Both A and R are true but R is NOT the correct
explanation of A.
(2) A is false but R is true.
(3) Both A and R are true and R is the correct
explanation of A.
(4) A is true but R is false

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Two monochromatic light beams have intensities in the ratio 1:9. An interference pattern is obtained by these beams. The ratio of the intensities of maximum to minimum

(1) 8 : 1 (2) 9 : 1
(3) 3 : 1 (4) 4 : 1

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A monochromatic light of frequency 5 × 1014 Hz travelling through air, is incident on a medium of refractive index '2'. Wavelength of the refracted light will be :

(1) 300 nm (2) 600 nm
(3) 400 nm (4) 500 nm

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A solid steel ball of diameter 3.6 mm acquired terminal velocity 2.45 × 10–2 m/s while falling under gravity through an oil of density 925 kg m–3. Take density of steel as 7825 kg m–3 and g as 9.8 m/s2. The viscosity of the oil in SI unit is

(1) 2.18 (2) 2.38
(3) 1.68 (4) 1.99

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

An electric bulb rated as 100 W-220 V is connected to an ac source of rms voltage 220 V. The peak value of current through the bulb is :

(1) 0.64 A (2) 0.45 A
(3) 2.2 A (4) 0.32 A

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A particle moves along the x-axis and has its displacement x varying with time t according to the equation 2 2 0 x  c (t  2)  c(t  2) where c0 and c are constants of appropriate dimensions. Then, which of the following statement is correct .

(1) the acceleration of the particle is 2c0
(2) the acceleration of the particle is 2c
(3) the initial velocity of the particle is 4c
(4) the acceleration of the particle is 2(c + c0)

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Pressure of an ideal gas, contained in a closed vessel, is increased by 0.4% when heated by 1°C. Its initial temperature must be :

(1) 25°C (2) 2500 K
(3) 250 K (4) 250°C

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : If oxygen ion (O–2) and Hydrogen ion (H+) enter normal to the magnetic field with equal momentum, then the path of O–2 ion has a smaller curvature than that of H+. Reason R : A proton with same linear momentum as an electron will form a path of smaller radius of curvature on entering a uniform magnetic field perpendicularly. In the light of the above statement, choose the correct answer from the options given below

(1) A is true but R is false
(2) Both A and R are true but R is NOT the correct
explanation of A
(3) A is false but R is true
(4) Both A and R are true and R is the correct
explanation of A

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%, then the loss of power in units of cal/s is

(1) 4 (2) 8.4
(3) 2 (4) 6.2

Answer

Ajay

300 Points

ANAS (4250) Points
Latest Answer: 5 months ago
In: JEE

An electron in the hydrogen atom initially in the fourth excited state makes a transition to nth energy state by emitting a photon of energy 2.86 eV. The integer value of n will be ________.

.

Answer

Ajay

300 Points

Jadon (1250) Points
Latest Answer:
In: JEE

Find the value of sin36

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

A block of mass m is placed on a rough inclined plane (angle θ) and is just about to slide down. What is the coefficient of static friction?

a) sinθ
b) cosθ
c) tanθ
d) 1/tanθ

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Two capacitors of 6 µF and 3 µF are connected in series. The equivalent capacitance is:

a) 9 µF
b) 4 µF
c) 2 µF
d) 1 µF

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

An ideal gas undergoes isothermal expansion. The work done is given by:

a) W=nRTln⁡VfViW = nRT \ln \frac{V_f}{V_i}W=nRTlnViVf
b) W=PΔVW = P\Delta VW=PΔV
c) W=32nRΔTW = \frac{3}{2}nR\Delta TW=23nRΔT
d) W=nCVΔTW = nC_V\Delta TW=nCVΔT

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

What is the de Broglie wavelength of an electron moving with a velocity of 3×10⁶ m/s? (mass of electron = 9.1×10⁻³¹ kg, h = 6.63×10⁻³⁴ Js)

a) 2.43 nm
b) 0.242 nm
c) 0.728 nm
d) 0.91 nm

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Calculate the number of moles in 8 grams of NaOH.

a) 0.1 mol
b) 0.2 mol
c) 0.5 mol
d) 1 mol
(Molar mass = 40 g/mol)

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Which of the following is a Lewis acid?

a) NH₃
b) BF₃
c) H₂O
d) OH⁻

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

What is the product of the reaction of CH₃–CH₂–OH with concentrated H₂SO₄ at 170°C?

a) CH₃–CH₂–OSO₃H
b) CH₂=CH₂
c) CH₃CH₂SO₄H
d) CH₃–CH₂–CH₃

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

The equilibrium constant (Kc) for the reaction: N₂ + 3H₂ ⇌ 2NH₃ is 0.5 at 500 K. What will be the value of Kp? (Assume R = 0.0821, T = 500 K)

a) 0.5
b) 0.062
c) 8.06
d) 1.62

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

. If 𝑧 = 2 + 3 𝑖 z=2+3i, then the modulus of z is:

a) 5
b) 13
c) √13
d) √5

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

The sum of the roots of the equation 𝑥 2 − 5 𝑥 + 6 = 0 x 2 −5x+6=0 is:

a) 6
b) 5
c) 2
d) 1

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

3. If 𝑓 ( 𝑥 ) = 𝑥 3 + 2 𝑥 2 + 1 f(x)=x 3 +2x 2 +1, then 𝑓 ’ ( 𝑥 ) f’(x) is:

a) 3x2+2x3x^2 + 2x3x2+2x
b) 3x2+4x3x^2 + 4x3x2+4x
c) 2x+12x + 12x+1
d) x2+4xx^2 + 4xx2+4x

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Evaluate ∫ 0 1 ( 3 𝑥 2 + 2 𝑥 + 1 ) 𝑑 𝑥 ∫ 0 1 (3x 2 +2x+1)dx

a) 2
b) 3
c) 1
d) 4

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

The equation of a line passing through (2, 3) and having slope 4 is:

a) y=4x+3y = 4x + 3y=4x+3
b) y−3=4(x−2)y - 3 = 4(x - 2)y−3=4(x−2)
c) y=2x+1y = 2x + 1y=2x+1
d) y+3=4xy + 3 = 4xy+3=4x

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

The distance between the points (1, 2) and (4, 6) is:

a) 5
b) √13
c) √25
d) 4

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

If 𝑎 ⃗ = 𝑖 ^ + 2 𝑗 ^ + 3 𝑘 ^ a = i ^ +2 j ^ +3 k ^ , and 𝑏 ⃗ = 2 𝑖 ^ + 𝑗 ^ + 𝑘 ^ b =2 i ^ + j ^ + k ^ , then 𝑎 ⃗ ⋅ 𝑏 ⃗ a ⋅ b is:

a) 3
b) 6
c) 8
d) 7

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

The angle between vectors 𝑎 ⃗ = 𝑖 ^ a = i ^ and 𝑏 ⃗ = 𝑖 ^ + 𝑗 ^ b = i ^ + j ^ is:

a) 30°
b) 45°
c) 60°
d) 90°

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

If sin ⁡ 𝜃 = 3 5 sinθ= 5 3 , and θ is acute, then cos ⁡ 𝜃 cosθ is:

a) 45\frac{4}{5}54
b) 53\frac{5}{3}35
c) 34\frac{3}{4}43
d) 25\frac{2}{5}52

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

The value of sin ⁡ 2 30 ∘ + cos ⁡ 2 60 ∘ sin 2 30 ∘ +cos 2 60 ∘ is:

a) 1
b) 0.5
c) 0.75
d) 0

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

If the standard EMF of a cell is +1.10 V, what can be inferred about the spontaneity of the reaction and the sign of ΔG?

a) Non-spontaneous, +ΔG
b) Spontaneous, –ΔG
c) Spontaneous, +ΔG
d) Non-spontaneous, –ΔG

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

If 𝑓 ( 𝑥 ) = 𝑥 𝑥 f(x)=x x , then find 𝑑 𝑑 𝑥 ( 𝑥 𝑥 ) dx d (x x )

a) xx(ln⁡x+1)x^x(\ln x + 1)xx(lnx+1)
b) xx−1x^{x-1}xx−1
c) xx(ln⁡x−1)x^x(\ln x - 1)xx(lnx−1)
d) ln⁡(xx)\ln(x^x)ln(xx)

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

If vectors 𝑎 ⃗ a and 𝑏 ⃗ b are such that ∣ 𝑎 ⃗ ∣ = ∣ 𝑏 ⃗ ∣ = 1 ∣ a ∣=∣ b ∣=1 and angle between them is 60°, then 𝑎 ⃗ ⋅ 𝑏 ⃗ = a ⋅ b =?

a) 0
b) 1
c) 0.5
d) √3

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Which of the following shows the highest oxidation state of manganese?

a) MnO
b) MnO₂
c) KMnO₄
d) MnSO₄

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Which of the following is correct for a spontaneous process at constant temperature and pressure?

a) ΔH > 0 and ΔS < 0
b) ΔG < 0
c) ΔG > 0
d) ΔS = 0

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

A loop of radius r is placed in a magnetic field perpendicular to the plane. If B changes with time, what is the induced emf?

a) πr2dBdt\pi r^2 \frac{dB}{dt}πr2dtdB
b) r2dBdtr^2 \frac{dB}{dt}r2dtdB
c) 2πrdBdt2\pi r \frac{dB}{dt}2πrdtdB
d) πrdBdt\pi r \frac{dB}{dt}πrdtdB

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

A body is projected at an angle θ with speed 𝑢 u. The range is maximum when θ is:

a) 30°
b) 45°
c) 60°
d) 90°

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

If 𝛼 , 𝛽 α,β are the roots of the equation 𝑥 2 − 5 𝑥 + 6 = 0 x 2 −5x+6=0, then the equation whose roots are 𝛼 + 1 α+1, 𝛽 + 1 β+1 is:

a) x2−7x+12=0x^2 - 7x + 12 = 0x2−7x+12=0
b) x2−6x+7=0x^2 - 6x + 7 = 0x2−6x+7=0
c) x2−5x+6=0x^2 - 5x + 6 = 0x2−5x+6=0
d) x2−5x+5=0x^2 - 5x + 5 = 0x2−5x+5=0

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

A bag contains 3 red and 2 black balls. Two balls are drawn without replacement. What is the probability that both are red?

a) 3/10
b) 1/2
c) 2/5
d) 3/5

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

In a face-centered cubic unit cell, what is the number of atoms per unit cell?

a) 1
b) 2
c) 4
d) 6

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Which of the following statements about physisorption is incorrect?

a) It occurs at low temperature
b) It is reversible
c) It involves van der Waals forces
d) Enthalpy of adsorption is high

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

A Carnot engine operates between 500 K and 300 K. What is its efficiency?

a) 20%
b) 40%
c) 60%
d) 70%

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Three resistors 2Ω, 3Ω, and 6Ω are connected in parallel. What is the equivalent resistance?

a) 1Ω
b) 2Ω
c) 3Ω
d) 11Ω

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

A monoatomic ideal gas initially at temperature T is given heat Q at constant volume. The final temperature is 2T. What is Q in terms of n, R, and T?

(a) (3/2) n R T
(b) (5/2) n R T
(c) (3/2) n R (2T)
(d) 3 n R T

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Which of the following is the correct order of basic strength of amines in aqueous medium?

(1) CH3NH2 > (CH3)2NH > (CH3)3N > NH3
(2) (CH3)2NH > CH3NH2 > (CH3)3N > NH3
(3) CH3NH2 > NH3 > (CH3)2NH > (CH3)3N
(4) (CH3)3N > (CH3)2NH > CH3NH2 > NH3

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

The moment of inertia of a uniform rod of mass m and length l is α when rotated about an axis passing through the centre and perpendicular to the length. If the rod is broken into equal halves and arranged as shown, then the moment of inertia about the given axis is:

(1) 2α
(2) α/2
(3) 4α
(4) α

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Which of the following statement(s) is correct for the adiabatic process?

(1)
􀀀1
0

Molar heat capacity is zero.
(2)
􀀀1
1

Molar heat capacity is infinite.
(3)
􀀀2
1

Work done on gas is equal to increase in interna [Read More]

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

What are the units of viscosity, intensity of wave, and pressure gradient?

(1) Viscosity: kg ·m−1 · s−1, Intensity of wave: kg ·m−1 · s−3, Pressure Gradient: kg ·m−2 · s−2
(2) Viscosity: N · s · m−2, Intensity of wave [Read More]

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Let a1, a2, a3, . . . be an A.P. and P12 k=1 a2k−1 = −72 5 a1 and Pn k=1 ak = 0. Then the value of n is:

(1) 8
(2) 10
(3) 11
(4) 13

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

In group 17, which property does not follow the regular trend?

(1) Electron affinity

(2) Ionisation energy
(3) Covalent radii
(4) Ionic radii

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Total number of terms in an A.P. are even. Sum of odd terms is 24 and sum of even terms is 30. Last term exceeds the first term by 21 2 . Find the total number of terms.

(1) 10 (2) 12 (3) 14 (4) 16

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

In 3, 3-dimethylhex-1-en-4-yne, the number of sp, sp² and sp³ carbon atoms, respectively are:

(1) 2, 2, 4 (2) 2, 2, 2 (3) 4, 2, 2 (4) 2, 4, 2

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

An equilateral prism is made of a material of refractive index √ 2. Find the angle of incidence for minimum deviation of the light ray

(1) 60◦ (2) 30◦ (3) 37◦ (4) 45◦

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Nature of compounds TeOand_ TeH is and respectively.

(1) Oxidising and Reducing respectively (2) Highly acidic and highly basic respectively (3) Reducing and Basic respectively (4) Basic and oxidising

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

Statement-I: Melting point of neopentane is greater than that of n-pentane. Statement-II: Neopentane gives only one mono-substituted product

(1) Both S-I and S-II are correct (2) Both S-I and S-II are incorrect (3) S-I is incorrect but S-II is correct (4) S-I is correct but S-II is incorrect

Answer

Ajay

300 Points

Mohammad Anas (13750) Points
Latest Answer: 3 months ago
In: JEE

A particle moves on a circular path of radius 1 m. Find its displacement when it moves from A → B → A. Also, its distance are it moves from A → B → A.

(1) Distance = 2 m, Displacement = 4π m (2) Distance = 2 m, Displacement = 5π m (3) Distance = 4π m, Displacement = 2 m (4) Distance = 2 m, Displacement = 2 m