JEE
Mansi Behl asked • 1 minute agoAccording to Bohr’s theory, the time averaged magnetic field at the centre (i.e. nucleus) of a hydrogen atom due to the motion of electrons in the nth orbit is proportional to : (n=principal quantum number)- a)n−4
- b)n−5
- c)n−3
- d)n−2
Correct answer is option 'D'. Can you explain this answer?
According to Bohr’s theory, the time averaged magnetic field at the centre (i.e. nucleus) of a hydrogen atom due to the motion of electrons in the nth orbit is proportional to : (n=principal quantum number)
a)
n−4
b)
n−5
c)
n−3
d)
n−2
Mansi Behl asked • 27 minutes agoIn the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If P(2a,0) be any point on the axis of parabola, then the chord QPR, satisfies
Reason(R): There exists a point on the axis of the parabola y2 = 4ax such that 
= constant for all chords QPR of the parabola.- a)Both Assertion and Reason are true and Reason is the correct explanation of assertion.
- b)Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
- c)Assertion is true but Reason is false.
- d)Assertion is false but Reason is true.
Correct answer is option 'A'. Can you explain this answer?
In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): If P(2a,0) be any point on the axis of parabola, then the chord QPR, satisfies
Reason(R): There exists a point on the axis of the parabola y2 = 4ax such that= constant for all chords QPR of the parabola.
Assertion(A): If P(2a,0) be any point on the axis of parabola, then the chord QPR, satisfies
Reason(R): There exists a point on the axis of the parabola y2 = 4ax such that
= constant for all chords QPR of the parabola.a)
Both Assertion and Reason are true and Reason is the correct explanation of assertion.
b)
Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
c)
Assertion is true but Reason is false.
d)
Assertion is false but Reason is true.
Sudeep Das asked • 36 minutes 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 • 40 minutes agoThe initial speed of a bullet fired from a rifle is 630 m/s. The rifle is fired at the centre of a target 700 m away at the same level as the target. How far above the centre of the target the rifle must be aimed in order to hit the target- a)4.2 m
- b)6.1 m
- c)1.0 m
- d)9.8 m
Correct answer is option 'B'. Can you explain this answer?
The initial speed of a bullet fired from a rifle is 630 m/s. The rifle is fired at the centre of a target 700 m away at the same level as the target. How far above the centre of the target the rifle must be aimed in order to hit the target
a)
4.2 m
b)
6.1 m
c)
1.0 m
d)
9.8 m
Mansi Behl asked • 49 minutes ago 
= - a)
- b)3
- c)3
- d)none
Correct answer is option 'B'. Can you explain this answer?
= a)
b)
3
c)
3
d)
none
Mansi Behl asked • 1 hour agoA single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. If the second and fourth minima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum? (i.e. distance between first minimum on either side of the central maximum)- a)1.5 cm
- b)3.0 cm
- c)4.5 cm
- d)6.0 cm
Correct answer is option 'A'. Can you explain this answer?
A single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. If the second and fourth minima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum? (i.e. distance between first minimum on either side of the central maximum)
a)
1.5 cm
b)
3.0 cm
c)
4.5 cm
d)
6.0 cm
is equal to : (where C is a constant of integration.)
Varad Rane asked • 1 hour agoIn an Young's double slit experiment setup, as shown in the figure, the light source executes simple harmonic motion between P and Q according to the equation x = Asinωtx, s being the mean position. Assume d→O and A≪L. ω is small enough to neglect Doppler effect. If the source were stationary at s, intensity at O would be I0.Q. The fringe width β can be expressed as- a)β=β0sinωt
- b)β=β0sin2ωt
- c)β=β0cosωt
- d)none of these
Correct answer is option 'D'. Can you explain this answer?
In an Young's double slit experiment setup, as shown in the figure, the light source executes simple harmonic motion between P and Q according to the equation x = Asinωtx, s being the mean position. Assume d→O and A≪L. ω is small enough to neglect Doppler effect. If the source were stationary at s, intensity at O would be I0.
Q. The fringe width β can be expressed as
a)
β=β0sinωt
b)
β=β0sin2ωt
c)
β=β0cosωt
d)
none of these
Puran Singh asked • 2 hours agoLet a, b and λ be positive real numbers. Suppose P is an end point of the latus rectum of the parabola y2 = 4λx, and suppose the ellipse 
passes through the point P. If the tangents to the parabola and the ellipse at the point P are perpendicular to each other, then the eccentricity of the ellipse is- a)1/√2
- b)1/2
- c)1/3
- d)2/5
Correct answer is option 'A'. Can you explain this answer?
Let a, b and λ be positive real numbers. Suppose P is an end point of the latus rectum of the parabola y2 = 4λx, and suppose the ellipse passes through the point P. If the tangents to the parabola and the ellipse at the point P are perpendicular to each other, then the eccentricity of the ellipse is
passes through the point P. If the tangents to the parabola and the ellipse at the point P are perpendicular to each other, then the eccentricity of the ellipse isa)
1/√2
b)
1/2
c)
1/3
d)
2/5
is Mansi Behl asked • 2 hours agoIn the circuit diagrams (A, B, C, and D) shown below, R is a high resistance and S is a resistance the order of galvanometer G. The correct circuit, corresponding to the half deflection method for finding the resistance and figure of merit of the galvanometer, is the circuit labelled as:
- a)Circuit C with G = S
- b)Circuit B with G = S
- c)Circuit A with
- d)Circuit D with
Correct answer is option 'D'. Can you explain this answer?
In the circuit diagrams (A, B, C, and D) shown below, R is a high resistance and S is a resistance the order of galvanometer G. The correct circuit, corresponding to the half deflection method for finding the resistance and figure of merit of the galvanometer, is the circuit labelled as:
a)
Circuit C with G = S
b)
Circuit B with G = S
c)
Circuit A with
d)
Circuit D with
Mansi Behl asked • 2 hours agoIn Young’s double slit experiment, the distance between slits and the screen is 1.0 m and monochromatic light of 600 nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance d0 between the slits. If the angular resolution of the eye is 1º/60 the value of d0 is close to :- a)1mm
- b)2mm
- c)4mm
- d)3mm
Correct answer is option 'B'. Can you explain this answer?
In Young’s double slit experiment, the distance between slits and the screen is 1.0 m and monochromatic light of 600 nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance d0 between the slits. If the angular resolution of the eye is 1º/60 the value of d0 is close to :
a)
1mm
b)
2mm
c)
4mm
d)
3mm
y = f (e tan x) then
is equal to Mansi Behl asked • 2 hours agoIn 1906, Robert Millikan devised an experiment that allowed him to determine the charge of an electron. A schematic of Millikan’s set – up is shown below:
Two metal plates are connected by a series of batteries to form a capacitor. There is an electric field between the plates. The metal plates are inside an insulated cylindrical container.
Oil drops are introduced into the container through a small hole in the top. The oil drops acquire a negative charge as they pass through the nozzle of the oil can. Some of the drops fall through a hole in the upper plate. By adjusting the voltage between the plates, certain drops can be suspended between them. The relationship between the electric field between the plates and the voltage across the plates is ∆V = EL
Where E is the electric field and L is the plate separation.
Millikan chose oil because of its relatively low vapour pressure and high charge holding ability. (To answer the following question assume oil drops as to be non-conducting tiny spheres)
Suppose the original oil droplet were replaced with a positively charged one that had twice the charge and three times the mass of the original droplet, how would the magnitude of the electric field have to be changed in order for the drop to remain suspended?... more
In 1906, Robert Millikan devised an experiment that allowed him to determine the charge of an electron. A schematic of Millikan’s set – up is shown below:
Two metal plates are connected by a series of batteries to form a capacitor. There is an electric field between the plates. The metal plates are inside an insulated cylindrical container.
Oil drops are introduced into the container through a small hole in the top. The oil drops acquire a negative charge as they pass through the nozzle of the oil can. Some of the drops fall through a hole in the upper plate. By adjusting the voltage between the plates, certain drops can be suspended between them. The relationship between the electric field between the plates and the voltage across the plates is ∆V = EL
Where E is the electric field and L is the plate separation.
Millikan chose oil because of its relatively low vapour pressure and high charge holding ability. (To answer the following question assume oil drops as to be non-conducting tiny spheres)
Two metal plates are connected by a series of batteries to form a capacitor. There is an electric field between the plates. The metal plates are inside an insulated cylindrical container.
Oil drops are introduced into the container through a small hole in the top. The oil drops acquire a negative charge as they pass through the nozzle of the oil can. Some of the drops fall through a hole in the upper plate. By adjusting the voltage between the plates, certain drops can be suspended between them. The relationship between the electric field between the plates and the voltage across the plates is ∆V = EL
Where E is the electric field and L is the plate separation.
Millikan chose oil because of its relatively low vapour pressure and high charge holding ability. (To answer the following question assume oil drops as to be non-conducting tiny spheres)
Suppose the original oil droplet were replaced with a positively charged one that had twice the charge and three times the mass of the original droplet, how would the magnitude of the electric field have to be changed in order for the drop to remain suspended?
Suman Kaur asked • 3 hours agoA particle of mass 'm' original at rest, is subjected to a force whose direction is constant but whose magnitude varies with according to the relation
,Where F0 and T are constant.
Then speed of the particle after a time 2T is:- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
A particle of mass 'm' original at rest, is subjected to a force whose direction is constant but whose magnitude varies with according to the relation
,Where F0 and T are constant.
Then speed of the particle after a time 2T is:
,Where F0 and T are constant.Then speed of the particle after a time 2T is:
a)
b)
c)
d)
Mansi Behl asked • 3 hours agoA block of mass 0.1 kg is connected to an elastic spring of spring constant 640 Nm−1 and oscillates in a damping medium of damping constant 10−2 kg s−1. The system dissipates its energy gradually. The time taken for its mechanical energy of vibration to drop to half of its initial value, is closest to :- a)2 s
- b)3.5 s
- c)5 s
- d)7 s
Correct answer is option 'D'. Can you explain this answer?
A block of mass 0.1 kg is connected to an elastic spring of spring constant 640 Nm−1 and oscillates in a damping medium of damping constant 10−2 kg s−1. The system dissipates its energy gradually. The time taken for its mechanical energy of vibration to drop to half of its initial value, is closest to :
a)
2 s
b)
3.5 s
c)
5 s
d)
7 s
Karan asked • 3 hours agoCan you explain the answer of this question below:Two tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces deflections of 60o and 45orespectively. The ratio of the number of turns in the coils is
- A:
4/3
- B:
(√3+1)/1
- C:
√3+1/√3-1
- D:
√3/1
- E:
undefined
The answer is d.
Two tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces deflections of 60o and 45orespectively. The ratio of the number of turns in the coils is
4/3
(√3+1)/1
√3+1/√3-1
√3/1
undefined
Mansi Behl asked • 3 hours agoA charged particle moving in a magnetic field experiences a resultant force- a)in a direction of magnetic field
- b)in the direction opposite to the magnetic field
- c)in the direction perpendicular to both the magnetic field and its velocity
- d)none of the above
Correct answer is option 'C'. Can you explain this answer?
A charged particle moving in a magnetic field experiences a resultant force
a)
in a direction of magnetic field
b)
in the direction opposite to the magnetic field
c)
in the direction perpendicular to both the magnetic field and its velocity
d)
none of the above
Mishika Jaiswal asked • 3 hours agoWhich of the following statements is correct- a)The stopping potential increases with increasing intensity of incident light
- b)The photocurrent increases with increasing intensity of light
- c)The photocurrent is proportional to applied voltage
- d)The current in a photocell increases with increasing frequency of light
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements is correct
a)
The stopping potential increases with increasing intensity of incident light
b)
The photocurrent increases with increasing intensity of light
c)
The photocurrent is proportional to applied voltage
d)
The current in a photocell increases with increasing frequency of light
Mansi Behl asked • 3 hours agoTime (T), velocity (C) and angular momentum (h) are chosen as fundamental quantities instead of mass, length and time. In terms of these, the dimensions of mass would be :- a)[M ]=[ T−1 C−2 h]
- b)[M]=[T−1 C2 h]
- c)[M]=[T−1 C−2 h−1]
- d)[M]=[T C−2 h]
Correct answer is option 'C'. Can you explain this answer?
Time (T), velocity (C) and angular momentum (h) are chosen as fundamental quantities instead of mass, length and time. In terms of these, the dimensions of mass would be :
a)
[M ]=[ T−1 C−2 h]
b)
[M]=[T−1 C2 h]
c)
[M]=[T−1 C−2 h−1]
d)
[M]=[T C−2 h]
Mansi Behl asked • 4 hours agoA particle starts from rest and has an acceleration of 2m − s⁻2 for 10 s. After that, it travels for 30 s with constant speed and then undergoes a retardation of 4 m − s⁻2 and comes back to rest. The total distance covered by the particle is- a)650 m
- b)700 m
- c)750 m
- d)800 m
Correct answer is option 'C'. Can you explain this answer?
A particle starts from rest and has an acceleration of 2m − s⁻2 for 10 s. After that, it travels for 30 s with constant speed and then undergoes a retardation of 4 m − s⁻2 and comes back to rest. The total distance covered by the particle is
a)
650 m
b)
700 m
c)
750 m
d)
800 m
Jeeva Anchitha asked • 4 hours agoTwo particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii R1 and R2 respectively. The ratio of the mass of X to that of Y is- a)(R1/R2)
- b)(R2/R1)
- c)(R1/R2)1/2
- d)(R1/R2)2
Correct answer is option 'D'. Can you explain this answer?
Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii R1 and R2 respectively. The ratio of the mass of X to that of Y is
a)
(R1/R2)
b)
(R2/R1)
c)
(R1/R2)1/2
d)
(R1/R2)2
Krishna Prajapati asked • 4 hours agoLet a1, a2, a3, ….. be a sequence of positive integers in arithmetic progression with common difference 2. Also, let b1, b2, b3, ….. be a sequence of positive integers in geometric progression with common ratio 2. If a1 = b1 = c, then the number of all possible values of c, for which the equality 2(a1 + a2 + ….+an ) = b1 + b2 + ….. + bn holds for some positive integer n, is ______
Correct answer is '1.00'. Can you explain this answer?
Let a1, a2, a3, ….. be a sequence of positive integers in arithmetic progression with common difference 2. Also, let b1, b2, b3, ….. be a sequence of positive integers in geometric progression with common ratio 2. If a1 = b1 = c, then the number of all possible values of c, for which the equality 2(a1 + a2 + ….+an ) = b1 + b2 + ….. + bn holds for some positive integer n, is ______
Mohan Singh asked • 4 hours agoLet C1 and C2 be two biased coins such that the probabilities of getting head in a single toss are 2/3 and 1/3, respectively. Suppose α is the number of heads that appear when C1 is tossed twice, independently, and suppose β is the number of heads that appear when C2 is tossed twice, independently, Then probability that the roots of the quadratic polynomial x2 – αx + β are real and equal, is- a)40/81
- b)20/81
- c)1/2
- d)1/4
Correct answer is option 'B'. Can you explain this answer?
Let C1 and C2 be two biased coins such that the probabilities of getting head in a single toss are 2/3 and 1/3, respectively. Suppose α is the number of heads that appear when C1 is tossed twice, independently, and suppose β is the number of heads that appear when C2 is tossed twice, independently, Then probability that the roots of the quadratic polynomial x2 – αx + β are real and equal, is
a)
40/81
b)
20/81
c)
1/2
d)
1/4
Danish Wajahath Wajahath asked • 4 hours agoA circular coil of radius R and N turns has negligible resistance. As shown in the schematic figure, its two ends are connected to two wires and it is hanging by those wires with its plane being vertical. The wires are connected to a capacitor with charge Q through a switch. The coil is in a horizontal uniform magnetic field Bo parallel to the plane of the coil. When the switch is closed, the capacitor gets discharged through the coil in a very short time. By the time the capacitor is discharged fully, magnitude of the angular momentum gained by the coil will be (assume that the discharge time is so short that the coil has hardly rotated during this time)- 
- a)(π/2)NQBoR2
- b)πNQBoR2
- c)2πNQBoR2
- d)4πNQBoR2
Correct answer is option 'B'. Can you explain this answer?
A circular coil of radius R and N turns has negligible resistance. As shown in the schematic figure, its two ends are connected to two wires and it is hanging by those wires with its plane being vertical. The wires are connected to a capacitor with charge Q through a switch. The coil is in a horizontal uniform magnetic field Bo parallel to the plane of the coil. When the switch is closed, the capacitor gets discharged through the coil in a very short time. By the time the capacitor is discharged fully, magnitude of the angular momentum gained by the coil will be (assume that the discharge time is so short that the coil has hardly rotated during this time)-
a)
(π/2)NQBoR2
b)
πNQBoR2
c)
2πNQBoR2
d)
4πNQBoR2
Gajula Deepak asked • 5 hours agoThere are two wires of the same length. The diameter of second wire is twice that of the first. On applying the same load to both the wires, the extension produced in them will be in ratio of : - a)1 : 4
- b)1 : 2
- c)2 : 1
- d)4 : 1
Correct answer is option 'D'. Can you explain this answer?
There are two wires of the same length. The diameter of second wire is twice that of the first. On applying the same load to both the wires, the extension produced in them will be in ratio of :
a)
1 : 4
b)
1 : 2
c)
2 : 1
d)
4 : 1
Khushi Matariya asked • 5 hours agoReceived a cheque of ₹ 1000 from shyam after banking hours 2500?
Mansi Behl asked • 5 hours agoIn the set W of whole numbers an equivalence relation R is defined as follows :
aRb iff both a and b leave same remainder when divided by 5. The equivalence class of 1 is given by- a){0, 5, 10, 15, ...}
- b){1, 6, 11, 16, ...}
- c){2, 7, 12, 17, ...}
- d){4, 9, 14, 19, ...}
Correct answer is option 'B'. Can you explain this answer?
In the set W of whole numbers an equivalence relation R is defined as follows :
aRb iff both a and b leave same remainder when divided by 5. The equivalence class of 1 is given by
aRb iff both a and b leave same remainder when divided by 5. The equivalence class of 1 is given by
a)
{0, 5, 10, 15, ...}
b)
{1, 6, 11, 16, ...}
c)
{2, 7, 12, 17, ...}
d)
{4, 9, 14, 19, ...}
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