JEE
Two conducting balls each of mass 15 gm and having equal charge on them of 126 μC are suspended by two 1 m long silk threads as shown. The separation between them is 8 cm when they are in equilibrium. When one of the balls is discharged to have half the original charge on each the new equilibrium separation will be –
- a)8 cm
- b)5 cm
- c)12 cm
- d)2 cm
Correct answer is option 'B'. Can you explain this answer?
Two conducting balls each of mass 15 gm and having equal charge on them of 126 μC are suspended by two 1 m long silk threads as shown. The separation between them is 8 cm when they are in equilibrium. When one of the balls is discharged to have half the original charge on each the new equilibrium separation will be –
a)
8 cm
b)
5 cm
c)
12 cm
d)
2 cm
Ombir answered • 2 hours ago
In the circuit shown, sliding contact is moving with uniform velocity towards right. Its value at some instance is 12
. The current in the circuit in the circuit at this instant of time will be –
- a)0.5 A
- b)More than 0.5A
- c)Less than 0.5A
- d)May be less or more than 0.5A depending on the value of L
Correct answer is option 'B'. Can you explain this answer?
In the circuit shown, sliding contact is moving with uniform velocity towards right. Its value at some instance is 12. The current in the circuit in the circuit at this instant of time will be –
. The current in the circuit in the circuit at this instant of time will be –a)
0.5 A
b)
More than 0.5A
c)
Less than 0.5A
d)
May be less or more than 0.5A depending on the value of L
Sanjay Kumar answered • 2 hours ago
Find the missing character.
- a)9
- b)13
- c)15
- d)16
Correct answer is option 'D'. Can you explain this answer?
Find the missing character.
a)
9
b)
13
c)
15
d)
16
Mehar Chand answered • 2 hours agoIn the first column, 17-11=25-19=6.
In the second column, 12-6=34-28=6.
Let the missing number in the third column be x.
Then, x-8=19-11=8 or x=16.
In the second column, 12-6=34-28=6.
Let the missing number in the third column be x.
Then, x-8=19-11=8 or x=16.
Monochromatic light is incident on a glass prism of angle A. If the refractive index of the material of the prism is μ, a ray, incident at an angle θ, on the face AB would get transmitted through the face AC of the prism provided.
- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
Monochromatic light is incident on a glass prism of angle A. If the refractive index of the material of the prism is μ, a ray, incident at an angle θ, on the face AB would get transmitted through the face AC of the prism provided.
a)
b)
c)
d)
Vijay Singh answered • 2 hours ago
sin θ = μ sin r1
sin r1 =
The length of a longest interval in which the function 3 sin x – 4 sin3x is increasing, is- a)π/3
- b)π/2
- c)3π/2
- d)π
Correct answer is option 'A'. Can you explain this answer?
The length of a longest interval in which the function 3 sin x – 4 sin3x is increasing, is
a)
π/3
b)
π/2
c)
3π/2
d)
π
Rampal answered • 2 hours ago3 sin x – 4 sin3 x = sin 3x which increases for
Tharo Bai asked • 1 hour agoAn experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrodes is measured with the help of an ideal voltmeter and which can be varied by moving jockey ‘J’ on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2?. The resistance of 100 cm long potentiometer wire is 8?.
The photocurrent is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm2 at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an independent circuit.The wavelengths of various colours is as follows : 
Q. It is found that ammeter current remains unchanged (2μA) even when the jockey is moved from the end ‘P’ to the middle point of the potentiometer wire. Assuming all the incident photons eject electron and the power of the light incident is 4 × 10–6 W. Then the colour of the incident light is... more
An experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrodes is measured with the help of an ideal voltmeter and which can be varied by moving jockey ‘J’ on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2?. The resistance of 100 cm long potentiometer wire is 8?.
The photocurrent is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm2 at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an independent circuit.
The wavelengths of various colours is as follows :
Q. It is found that ammeter current remains unchanged (2μA) even when the jockey is moved from the end ‘P’ to the middle point of the potentiometer wire. Assuming all the incident photons eject electron and the power of the light incident is 4 × 10–6 W. Then the colour of the incident light is
At present, a firm is manufacturing 2000 items. It is estimated that the rate of change of production P w.r.t.
additional number of workers x is given by 
. If the firm employs 25 more workers, then
the new level of production of items is- a)3000
- b)3500
- c)4500
- d)2500
Correct answer is option 'B'. Can you explain this answer?
At present, a firm is manufacturing 2000 items. It is estimated that the rate of change of production P w.r.t.
additional number of workers x is given by. If the firm employs 25 more workers, then
the new level of production of items is
additional number of workers x is given by
. If the firm employs 25 more workers, thenthe new level of production of items is
a)
3000
b)
3500
c)
4500
d)
2500
Jagraj Singh answered • 2 hours ago
Helium gas at 27oC has a volume of 8 L. It is suddenly compressed to a volume of 1 L. The final temperature of the gas will be(γ = 5/3 )- a)108oC
- b)327oC
- c)627oC
- d)927oC
Correct answer is option 'D'. Can you explain this answer?
Helium gas at 27oC has a volume of 8 L. It is suddenly compressed to a volume of 1 L. The final temperature of the gas will be(γ = 5/3 )
a)
108oC
b)
327oC
c)
627oC
d)
927oC
Puran Chand answered • 2 hours agoT1 V1 γ-1 = T2 V2 γ-1
or 300 (8)5/3 - 1 = T2 (1)5/3 - 1
T2 = 300 {(2)3}2/3 = 1200 K
or T2 = 927oC
or 300 (8)5/3 - 1 = T2 (1)5/3 - 1
T2 = 300 {(2)3}2/3 = 1200 K
or T2 = 927oC
SECTION-III (Total Marks : 24)(Integer Answer Type)This section contains 6 questions. The answer to each of the questions is a single-digit integer, ranging from 0 to 9.Enter only the numerical value in the space provided below.Q. A series R-C combination is connected to an AC voltage of angular frequency ω = 500 radian/s. If the
impedance of the R-C circuit is 
the time constant (in millisecond) of the circuit is
Correct answer is '4'. Can you explain this answer?
SECTION-III (Total Marks : 24)
(Integer Answer Type)
This section contains 6 questions. The answer to each of the questions is a single-digit integer, ranging from 0 to 9.
Enter only the numerical value in the space provided below.
Q. A series R-C combination is connected to an AC voltage of angular frequency ω = 500 radian/s. If the
impedance of the R-C circuit is the time constant (in millisecond) of the circuit is
impedance of the R-C circuit is
the time constant (in millisecond) of the circuit is Vinod Kumar Garg answered • 2 hours ago
Sunita Devi asked • 1 hour agoThe decay constant of a radio active substance is 0.173 (years)-1. Therefore : - a)Nearly 63% of the radioactive substance will decay in (1/0.173) year.
- b)half life of the radio active substance is (1/0.173) year.
- c)one -forth of the radioactive substance will be left after nearly 8 years.
- d)average life of the substance is nearly 5.8 years.
Correct answer is option 'A,C,D'. Can you explain this answer?
The decay constant of a radio active substance is 0.173 (years)-1. Therefore :
a)
Nearly 63% of the radioactive substance will decay in (1/0.173) year.
b)
half life of the radio active substance is (1/0.173) year.
c)
one -forth of the radioactive substance will be left after nearly 8 years.
d)
average life of the substance is nearly 5.8 years.
Kamlesh asked • 1 hour agoStatement-1 : When a beam of highly energetic neutrons is incident on a tungsten target, no X-rays will be produced.Statement-2 : Neutrons do not exert any electrostatic force on electrons or nucleus of an atom.- a)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
- b)Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
- c)Statement-1 is True, Statement-2 is False
- d)Statement-1 is False, Statement-2 is True.
Correct answer is option 'D'. Can you explain this answer?
Statement-1 : When a beam of highly energetic neutrons is incident on a tungsten target, no X-rays will be produced.
Statement-2 : Neutrons do not exert any electrostatic force on electrons or nucleus of an atom.
a)
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
b)
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
c)
Statement-1 is True, Statement-2 is False
d)
Statement-1 is False, Statement-2 is True.
Kamla Devi asked • 1 hour agoA metallic charged ring is placed in a uniform magnetic field with its plane perpendicular to the field. If the magnitude of field starts increasing with time, then : - a) the ring starts translating
- b)the ring starts rotating about its axis
- c)the ring starts rotating about a diameter
- d)current starts flowing in the ring
Correct answer is option 'D'. Can you explain this answer?
A metallic charged ring is placed in a uniform magnetic field with its plane perpendicular to the field. If the magnitude of field starts increasing with time, then :
a)
the ring starts translating
b)
the ring starts rotating about its axis
c)
the ring starts rotating about a diameter
d)
current starts flowing in the ring
Ram Ratti asked • 1 hour agoStatement-1 : In process of photoelectric emission, all emitted electrons donot have same kinetic energy.Statement-2 : If radiation falling on photosensitive surface of a metal consists of different wavelengths, then energy acquired by electrons absorbing photons of different wavelengths shall be different.- a)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
- b)Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
- c)Statement-1 is True, Statement-2 is False
- d)Statement-1 is False, Statement-2 is True.
Correct answer is option 'B'. Can you explain this answer?
Statement-1 : In process of photoelectric emission, all emitted electrons donot have same kinetic energy.
Statement-2 : If radiation falling on photosensitive surface of a metal consists of different wavelengths, then energy acquired by electrons absorbing photons of different wavelengths shall be different.
a)
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
b)
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
c)
Statement-1 is True, Statement-2 is False
d)
Statement-1 is False, Statement-2 is True.
Jamna Devi asked • 1 hour agoA metal nitrate solution reacts with dilute hydrochloric acid to give a white precipitate which is soluble in concentrated potassium chloride. White precipitate on passing of hydrogen sulphide gas is converted into black precipitate. The black precipitate on boiling with hydrogen peroxide (3%) is converted again to a white precipitate which is soluble in ammonium acetate. The cation of the metal nitrate is :- a)Pb2+
- b)Ag+
- c)Hg2+
- d)Bi3+
Correct answer is option 'A'. Can you explain this answer?
A metal nitrate solution reacts with dilute hydrochloric acid to give a white precipitate which is soluble in concentrated potassium chloride. White precipitate on passing of hydrogen sulphide gas is converted into black precipitate. The black precipitate on boiling with hydrogen peroxide (3%) is converted again to a white precipitate which is soluble in ammonium acetate. The cation of the metal nitrate is :
a)
Pb2+
b)
Ag+
c)
Hg2+
d)
Bi3+
Bhola Singh asked • 1 hour agoStatement 1 : The locus represented by xy + yz = 0 is a pair of perpendicular planes.Statement 2 : If a1x + b1y + c1z + d1 = 0 and a2x + b2y + c2z + d2 = 0 are perpendicular then a1a2 + b1b2 + c1c2 = 1.- a)Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
- b)Statement-1 is True, Statement-2 is True; Statement-2 is not a correct explanation for Statement-1
- c)Statement-1 is True, Statement-2 is False
- d)Statement-1 is False, Statement-2 is True
Correct answer is option 'C'. Can you explain this answer?
Statement 1 : The locus represented by xy + yz = 0 is a pair of perpendicular planes.
Statement 2 : If a1x + b1y + c1z + d1 = 0 and a2x + b2y + c2z + d2 = 0 are perpendicular then a1a2 + b1b2 + c1c2 = 1.
a)
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
b)
Statement-1 is True, Statement-2 is True; Statement-2 is not a correct explanation for Statement-1
c)
Statement-1 is True, Statement-2 is False
d)
Statement-1 is False, Statement-2 is True
=
Rahul Garg asked • 4 hours agoA plano convex lens of refractive index µ1 and focal length f1 is kept in contact with another plano concave lens of refractive index µ2 and focal length f2. If the radius of curvature of their spherical faces is R each and f1 = 2f2, then µ1 and µ2 are related as - a)µ1 + µ2 = 3
- b)2µ1 – µ2 = 1
- c)2µ2 – µ1 = 1
- d)3µ2 – 2µ1 = 1
Correct answer is option 'B'. Can you explain this answer?
A plano convex lens of refractive index µ1 and focal length f1 is kept in contact with another plano concave lens of refractive index µ2 and focal length f2. If the radius of curvature of their spherical faces is R each and f1 = 2f2, then µ1 and µ2 are related as
a)
µ1 + µ2 = 3
b)
2µ1 – µ2 = 1
c)
2µ2 – µ1 = 1
d)
3µ2 – 2µ1 = 1
Hari Karthik asked • 6 hours agoThe following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are as shown below.
The logic circuit gate is- a)AND gate
- b)NAND gate
- c)NOR gate
- d)OR gate
Correct answer is option 'A'. Can you explain this answer?
The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are as shown below.
The logic circuit gate is
The logic circuit gate is
a)
AND gate
b)
NAND gate
c)
NOR gate
d)
OR gate
Manas Khara asked • 6 hours agoWhich of the following statements is / are correct with respect to Carbon Credits? - Certified Emission Reduction (CER) certificate is an titlement of Carbon Credits
- Transfer of carbon credits is taxable in India
Select the correct option from the codes given below:- a)Only 1
- b)Only 2
- c)Both 1 & 2
- d)none of these
Correct answer is option 'C'. Can you explain this answer?
Which of the following statements is / are correct with respect to Carbon Credits?
- Certified Emission Reduction (CER) certificate is an titlement of Carbon Credits
- Transfer of carbon credits is taxable in India
Select the correct option from the codes given below:
a)
Only 1
b)
Only 2
c)
Both 1 & 2
d)
none of these
then
Sunil Kumar asked • 7 hours 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): The solution of the differential equation 
Reason(R): As the integrating factor of given differential equation is (1/y) .- 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): The solution of the differential equation
Reason(R): As the integrating factor of given differential equation is (1/y) .
Assertion(A): The solution of the differential equation
Reason(R): As the integrating factor of given differential equation is (1/y) .
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.
Mansi Behl asked • 7 hours 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): A variable circle passes through the fixed point A(p,q) and touches x-axis . The locus of the other end of the diameter through A is (x - p)2 = 4qy.
Reason(R): An equation of the tangent to the circle x2 + y2 + 2gx + 2fy + c = 0 at the point (x1, y1) on the circle is xx1 - yy1 + g(x - x1) + f(y - y1) - c = 0 .- 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 'C'. 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): A variable circle passes through the fixed point A(p,q) and touches x-axis . The locus of the other end of the diameter through A is (x - p)2 = 4qy.
Reason(R): An equation of the tangent to the circle x2 + y2 + 2gx + 2fy + c = 0 at the point (x1, y1) on the circle is xx1 - yy1 + g(x - x1) + f(y - y1) - c = 0 .
Assertion(A): A variable circle passes through the fixed point A(p,q) and touches x-axis . The locus of the other end of the diameter through A is (x - p)2 = 4qy.
Reason(R): An equation of the tangent to the circle x2 + y2 + 2gx + 2fy + c = 0 at the point (x1, y1) on the circle is xx1 - yy1 + g(x - x1) + f(y - y1) - c = 0 .
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.
X is:
then
Sulakhan Singh asked • 7 hours agoDirection (Q. Nos. 11-13) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.Q.Statement I : On heating a metal for a longer time, radiations become white and then blue as the temperature increases.
Statement II : Radiations emitted go from a lower frequency to higher frequency as the temperature increases.- a)Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
- b)Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
- c)Statement I is correct but Statement II is incorrect
- d)Statement II is correct but Statement I is incorrect
Correct answer is option 'A'. Can you explain this answer?
Direction (Q. Nos. 11-13) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.
Q.
Statement I : On heating a metal for a longer time, radiations become white and then blue as the temperature increases.
Statement II : Radiations emitted go from a lower frequency to higher frequency as the temperature increases.
Statement II : Radiations emitted go from a lower frequency to higher frequency as the temperature increases.
a)
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
b)
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
c)
Statement I is correct but Statement II is incorrect
d)
Statement II is correct but Statement I is incorrect
Ram Mohith asked • 7 hours 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 arg(z) < 0, then arg (-z)-arg(z) = -π.
Reason(R): The complex number z satisfying
|z-1| = |z-3| = |z-i| is 2 + 2i.- 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 'D'. 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 arg(z) < 0, then arg (-z)-arg(z) = -π.
Reason(R): The complex number z satisfying
|z-1| = |z-3| = |z-i| is 2 + 2i.
Assertion(A): If arg(z) < 0, then arg (-z)-arg(z) = -π.
Reason(R): The complex number z satisfying
|z-1| = |z-3| = |z-i| is 2 + 2i.
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.
Then the global minimum value of the function isFetching relevant content for you
Ask a question
Related Courses
Follow Us
