JEE
Which of the following is not an empty set?- a){x : x is a multiple of 7, x < 7, x ∈ N}
- b)Set of common points of two parallel lines in a plane
- c){x : 6 + 2x > 5x + 3, x ∈ N}
- d)Set of smallest whole number
Correct answer is 'D'. Can you explain this answer?
Which of the following is not an empty set?
a)
{x : x is a multiple of 7, x < 7, x ∈ N}
b)
Set of common points of two parallel lines in a plane
c)
{x : 6 + 2x > 5x + 3, x ∈ N}
d)
Set of smallest whole number
Raja Kotni answered • 1 hour agoOption d is the correct because remaining options are empty sets
A particle A of mass 'm' and charge 'q' is accelerated by a potential difference of 50v another particle B of mass '4m' and charge 'q' is accelerated by a potential differnce of 2500V. The ratio of de - Broglie wavelength λA/λB is
Correct answer is '14.14'. Can you explain this answer?
A particle A of mass 'm' and charge 'q' is accelerated by a potential difference of 50v another particle B of mass '4m' and charge 'q' is accelerated by a potential differnce of 2500V. The ratio of de - Broglie wavelength λA/λB is
Ayaan Madhukar answered • 2 hours ago
Pushpa Devi asked • 14 minutes agoThe vector 
equals- a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
The vector equals
equalsa)
b)
c)
d)
= k sin 
,
tan 
=
Pooja Garg asked • 22 minutes agoConsider the kinetic data given in the following table for the reaction A + B + C → Product.
The rate of the reaction for [A] = 0.15 mol dm–3, [B] = 0.25 mol dm–3 and [C] = 0.15 mol dm–3 is found to be Y × 10–5 mol dm–3 s–1. The value of Y is ––––––––
Correct answer is '6.75'. Can you explain this answer?
Consider the kinetic data given in the following table for the reaction A + B + C → Product.
The rate of the reaction for [A] = 0.15 mol dm–3, [B] = 0.25 mol dm–3 and [C] = 0.15 mol dm–3 is found to be Y × 10–5 mol dm–3 s–1. The value of Y is ––––––––
The rate of the reaction for [A] = 0.15 mol dm–3, [B] = 0.25 mol dm–3 and [C] = 0.15 mol dm–3 is found to be Y × 10–5 mol dm–3 s–1. The value of Y is ––––––––
If f(x) is increasing for all values of x then
Chirag Goel asked • 1 hour agoA student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is 1 s, then the reported mean time should be :- a)92 ± 2 s
- b)92 ± 5.0 s
- c)92 ± 1.8 s
- d)92 ± 3 s
Correct answer is option 'A'. Can you explain this answer?
A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is 1 s, then the reported mean time should be :
a)
92 ± 2 s
b)
92 ± 5.0 s
c)
92 ± 1.8 s
d)
92 ± 3 s
Harshed Abdulla asked • 1 hour 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 relation R on the set of complex number defined by Z1 R Z2 ⇔ Z1 − Z2 is real, is an equivalence relation.
Reason(R) :Reflexive and symmetric properties may not imply transitivity.- 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) :A relation R on the set of complex number defined by Z1 R Z2 ⇔ Z1 − Z2 is real, is an equivalence relation.
Reason(R) :Reflexive and symmetric properties may not imply transitivity.
Assertion(A) :A relation R on the set of complex number defined by Z1 R Z2 ⇔ Z1 − Z2 is real, is an equivalence relation.
Reason(R) :Reflexive and symmetric properties may not imply transitivity.
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.
Kruthika C.k asked • 1 hour agoEvery even power of an odd number greater than 1 when divided by 8 leaves 1 as the remainder.The inductive step for the above statement is- a)P(1) = 32 = 8.1 + 1
- b)P(k) = (2k + 1)2 = 8a + 1 implies P(k + 1):(2k + 3)2 = 8b + 1 for some natural numbers a,b
- c)P(k) = (2k + 1)2n = 8a + 1 implies P(k + 1) : (2k + 3)2n + 2 = 8b + 1 for some natural number a,b
- d)P(k) = (2k – 1)2 = 8a + 1 implies P(k + 1); (2k + 1)2 = 8b + 1 for some natural numbers a,b
Correct answer is option 'C'. Can you explain this answer?
Every even power of an odd number greater than 1 when divided by 8 leaves 1 as the remainder.The inductive step for the above statement is
a)
P(1) = 32 = 8.1 + 1
b)
P(k) = (2k + 1)2 = 8a + 1 implies P(k + 1):(2k + 3)2 = 8b + 1 for some natural numbers a,b
c)
P(k) = (2k + 1)2n = 8a + 1 implies P(k + 1) : (2k + 3)2n + 2 = 8b + 1 for some natural number a,b
d)
P(k) = (2k – 1)2 = 8a + 1 implies P(k + 1); (2k + 1)2 = 8b + 1 for some natural numbers a,b
Anusuya asked • 2 hours agoFor the equilibrium,PCI3 
PCI3 (g) + CI2 (g)Which of the following sketch may represent above equilibrium. Assume equilibrium can be achieved from either side and by taking any one or more components initially. (Given Kcfor the reaction < 2)- a)
- b)
- c)
- d)
Correct answer is option 'B,D'. Can you explain this answer?
For the equilibrium,
PCI3 PCI3 (g) + CI2 (g)
PCI3 (g) + CI2 (g)Which of the following sketch may represent above equilibrium. Assume equilibrium can be achieved from either side and by taking any one or more components initially. (Given Kcfor the reaction < 2)
a)
b)
c)
d)
Harpal asked • 2 hours agoThe equation of the plane passing through the point (1,1,1) and perpendicular to the planes 2x + y – 2z = 5 and 3x – 6y – 2z = 7, is- a)14x + 2y + 15z = 31
- b)14x + 2y – 15z = 1
- c)–14x + 2y + 15z = 3
- d)14x – 2y + 15z = 27
Correct answer is option 'A'. Can you explain this answer?
The equation of the plane passing through the point (1,1,1) and perpendicular to the planes 2x + y – 2z = 5 and 3x – 6y – 2z = 7, is
a)
14x + 2y + 15z = 31
b)
14x + 2y – 15z = 1
c)
–14x + 2y + 15z = 3
d)
14x – 2y + 15z = 27
Amarjeet asked • 2 hours agoLet O be the origin, and 
be three unit vectors in the directions of the sides 
respectively, of a triangle PQR.Q. If the triangle PQR varies, then the minimum value of cos(P + Q) + cos(Q + R) + cos(R + P) is- a)3/2
- b)-3/2
- c)3/5
- d)-3/5
Correct answer is option 'B'. Can you explain this answer?
Let O be the origin, and be three unit vectors in the directions of the sides respectively, of a triangle PQR.
be three unit vectors in the directions of the sides respectively, of a triangle PQR.Q. If the triangle PQR varies, then the minimum value of cos(P + Q) + cos(Q + R) + cos(R + P) is
a)
3/2
b)
-3/2
c)
3/5
d)
-3/5
Jit Singh asked • 2 hours agoIn a bimolecular reaction, the steric factor P was experimentally determined to be 4.5. The correct option(s) among the following is(are):- a)The value of frequency factor predicted by Arrhenius equation is higher than that determined experimentally
- b)The activation energy of the reaction is unaffected by the value of the steric factor
- c)Since P = 4.5, the reaction will not proceed unless an effective catalyst is used.
- d)Experimentally determined value of frequency factor is higher than that predicted by Arrhenius equation.
Correct answer is option 'B,D'. Can you explain this answer?
In a bimolecular reaction, the steric factor P was experimentally determined to be 4.5. The correct option(s) among the following is(are):
a)
The value of frequency factor predicted by Arrhenius equation is higher than that determined experimentally
b)
The activation energy of the reaction is unaffected by the value of the steric factor
c)
Since P = 4.5, the reaction will not proceed unless an effective catalyst is used.
d)
Experimentally determined value of frequency factor is higher than that predicted by Arrhenius equation.
Roshan Lal asked • 2 hours agoUpon heating KClO3 in the presence of catalytic amount of MnO2, a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with pure HNO3 gives Y and Z.Q. Y and Z are , respectively- a)N2O4 and H3PO3
- b)N2O4 and HPO3
- c)N2O5 and HPO3
- d)N2O3 and H3PO4
Correct answer is option 'C'. Can you explain this answer?
Upon heating KClO3 in the presence of catalytic amount of MnO2, a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with pure HNO3 gives Y and Z.
Q. Y and Z are , respectively
a)
N2O4 and H3PO3
b)
N2O4 and HPO3
c)
N2O5 and HPO3
d)
N2O3 and H3PO4
Sunita asked • 2 hours agoTwo coherent monochromatic point sources S1 and S2 of wavelength λ = 600 nm are placed symmetrically on either side of the center of the circle as shown. The sources are separated by a distance d = 1.8mm. This arrangement produces interference fringes visible as alternate bright and dark spots on the circumference of the circle. The angular separation between two consecutive bright spots is Δθ. Which of the following options is/are correct ?
- a)A dark spot will be formed at the point P2
- b)The angular separation between two consecutive bright spots decreases as we move from P1 to P2 along the first quadrant
- c)At P2 the order of the fringe will be maximum
- d)The total number of fringes produced between P1 and P2 in the first quadrant is close to 3000
Correct answer is option 'C,D'. Can you explain this answer?
Two coherent monochromatic point sources S1 and S2 of wavelength λ = 600 nm are placed symmetrically on either side of the center of the circle as shown. The sources are separated by a distance d = 1.8mm. This arrangement produces interference fringes visible as alternate bright and dark spots on the circumference of the circle. The angular separation between two consecutive bright spots is Δθ. Which of the following options is/are correct ?
a)
A dark spot will be formed at the point P2
b)
The angular separation between two consecutive bright spots decreases as we move from P1 to P2 along the first quadrant
c)
At P2 the order of the fringe will be maximum
d)
The total number of fringes produced between P1 and P2 in the first quadrant is close to 3000
then
then
Natha Singh asked • 2 hours agoA person measures the depth of a well by measuring the time interval between dropping a stone and receiving the sound of impact with the bottom of the well. The error in his measurement of time is δT = 0.01 second and he measures the depth of the well to be L = 20 meters. Take the acceleration due to gravity g = 10 ms–2and the velocity of sound is 300 ms–1. Then the fractional error in the measurement, δL/L, is closest to- a)0.2 %
- b)5 %
- c)3 %
- d)1 %
Correct answer is option 'D'. Can you explain this answer?
A person measures the depth of a well by measuring the time interval between dropping a stone and receiving the sound of impact with the bottom of the well. The error in his measurement of time is δT = 0.01 second and he measures the depth of the well to be L = 20 meters. Take the acceleration due to gravity g = 10 ms–2and the velocity of sound is 300 ms–1. Then the fractional error in the measurement, δL/L, is closest to
a)
0.2 %
b)
5 %
c)
3 %
d)
1 %
Rajbeer Kaur asked • 2 hours agoPARAGRAPH–1
Consider a simple RC circuit as shown in figure 1.
Process 1 : In the circuit the switch S is closed at t = 0 and the capacitor is fully charged to voltage V0 (i.e., charging continues for time T >> RC). In the process some dissipation (ED) occurs across the resistance R. The amount of energy finally stored in the fully charged capacitor is EC.
Process 2 : In a different process the voltage is first set to 
and maintained for a charging time T >> RC. Then the voltage is raised to 
without discharging the capacitor and again maintained for a time T >> RC. The process is repeated one more time by raising the voltage to V0 and the capacitor is charged to the same final voltage V0 as in Process 1. These two processes are depicted in Figure 2.
Q. In Process 1, the energy stored in the capacitor EC and heat dissipated across resistance ED are related by :-... more
PARAGRAPH–1
Consider a simple RC circuit as shown in figure 1.
Process 1 : In the circuit the switch S is closed at t = 0 and the capacitor is fully charged to voltage V0 (i.e., charging continues for time T >> RC). In the process some dissipation (ED) occurs across the resistance R. The amount of energy finally stored in the fully charged capacitor is EC.
Process 2 : In a different process the voltage is first set toand maintained for a charging time T >> RC. Then the voltage is raised to without discharging the capacitor and again maintained for a time T >> RC. The process is repeated one more time by raising the voltage to V0 and the capacitor is charged to the same final voltage V0 as in Process 1. These two processes are depicted in Figure 2.
Consider a simple RC circuit as shown in figure 1.
Process 1 : In the circuit the switch S is closed at t = 0 and the capacitor is fully charged to voltage V0 (i.e., charging continues for time T >> RC). In the process some dissipation (ED) occurs across the resistance R. The amount of energy finally stored in the fully charged capacitor is EC.
Process 2 : In a different process the voltage is first set to
and maintained for a charging time T >> RC. Then the voltage is raised to without discharging the capacitor and again maintained for a time T >> RC. The process is repeated one more time by raising the voltage to V0 and the capacitor is charged to the same final voltage V0 as in Process 1. These two processes are depicted in Figure 2.Q. In Process 1, the energy stored in the capacitor EC and heat dissipated across resistance ED are related by :-
Then
for the function
Mela Devi asked • 2 hours agoAn equilateral triangle is made by uniform wires AB, BC, CA. A current I enters at A and leaves from the mid point of BC. If the lengths of each side of the triangle is L, the magnetic field B at the centroid O of the triangle is
- a)
- b)
- c)
- d)zero
Correct answer is option 'D'. Can you explain this answer?
An equilateral triangle is made by uniform wires AB, BC, CA. A current I enters at A and leaves from the mid point of BC. If the lengths of each side of the triangle is L, the magnetic field B at the centroid O of the triangle is
a)
b)
c)
d)
zero
Shyam Wati asked • 2 hours agoThe velocity of a car travelling on a straight road is 36 kmh–1 at an instant of time. Now travelling with uniform acceleration for 10 s, the velocity becomes exactly double. If the wheel radius of the car is 25 cm, then which of the following numbers is the closest to the number of revolutions that the wheel makes during this 10 s?- a)84
- b)95
- c)126
- d)135
Correct answer is option 'B'. Can you explain this answer?
The velocity of a car travelling on a straight road is 36 kmh–1 at an instant of time. Now travelling with uniform acceleration for 10 s, the velocity becomes exactly double. If the wheel radius of the car is 25 cm, then which of the following numbers is the closest to the number of revolutions that the wheel makes during this 10 s?
a)
84
b)
95
c)
126
d)
135
Sita Devi asked • 2 hours agoThe molar conductance of NaCl varies with the concentration as shown in the following table.
When a certain conductivity cell (C) was filled with 25 ´ 10-4(M) NaCl solution. The resistance of the cell was found to be 1000 ohm. At infinite dilution, conductance of Cl - and SO4–2 are 80 ohm-1cm2mole-1 and 160 ohm-1cm2mole-1 respectively.Q.What is the cell constant of the conductivity cell (C)- a)0.3895 cm–1
- b)(C) (A) 0.3895 cm–1
- c)(A) 0.3895 cm–1 (B) 3.85 cm–1 (C) 38.5 cm–1
- d)0.1925 cm–1
Correct answer is option 'D'. Can you explain this answer?
The molar conductance of NaCl varies with the concentration as shown in the following table.
When a certain conductivity cell (C) was filled with 25 ´ 10-4(M) NaCl solution. The resistance of the cell was found to be 1000 ohm. At infinite dilution, conductance of Cl - and SO4–2 are 80 ohm-1cm2mole-1 and 160 ohm-1cm2mole-1 respectively.
Q.
What is the cell constant of the conductivity cell (C)
a)
0.3895 cm–1
b)
(C) (A) 0.3895 cm–1
c)
(A) 0.3895 cm–1 (B) 3.85 cm–1 (C) 38.5 cm–1
d)
0.1925 cm–1
Krishana Devi asked • 2 hours agoAn object placed at a distance of 16 cm from a convex lens produces an image of magnification m (m > 1). If the object is moved towards the lens by 8 cm then again an image of magnification m is obtained. The numerical value of the focal length of the lens is- a)12 cm
- b)14 cm
- c)18 cm
- d)20 cm
Correct answer is option 'A'. Can you explain this answer?
An object placed at a distance of 16 cm from a convex lens produces an image of magnification m (m > 1). If the object is moved towards the lens by 8 cm then again an image of magnification m is obtained. The numerical value of the focal length of the lens is
a)
12 cm
b)
14 cm
c)
18 cm
d)
20 cm
Birmati asked • 2 hours agoOleum is considered as a solution of S03 in H2S04 , which is obtained by passing 803 in solution of H2SO4. When 100 g sample of oleum is diluted with desired weight of H20 then the total mass of H2SO4 obtained after dilution is known as % labelling in oleum.
For example, a oleum bottle labelled as '109% H2SO4 means the 109g total mass of pure H2SO4 will be formed when 100 g of oleum is diluted by 9 g of Hp which combines with all the free 803 to form H2SO4 as S03 + H20 → + H2SO4.Q.If excess water is added into a 100 g bottle sample labelled as '' 112% H2SO4 '' and is reacted with 5.3 g Na2CO3, then find the volume of C02 evolved at 1 atm pressure and 300 k temperature after the completion of the reaction : [R = 0.0821 L atom mol–1 K–1]H2SO4 + Na2CO3 → Na2SO4 + H20 + CO2... more
Oleum is considered as a solution of S03 in H2S04 , which is obtained by passing 803 in solution of H2SO4. When 100 g sample of oleum is diluted with desired weight of H20 then the total mass of H2SO4 obtained after dilution is known as % labelling in oleum.
For example, a oleum bottle labelled as '109% H2SO4 means the 109g total mass of pure H2SO4 will be formed when 100 g of oleum is diluted by 9 g of Hp which combines with all the free 803 to form H2SO4 as
For example, a oleum bottle labelled as '109% H2SO4 means the 109g total mass of pure H2SO4 will be formed when 100 g of oleum is diluted by 9 g of Hp which combines with all the free 803 to form H2SO4 as
S03 + H20 → + H2SO4.
Q.
If excess water is added into a 100 g bottle sample labelled as '' 112% H2SO4 '' and is reacted with 5.3 g Na2CO3, then find the volume of C02 evolved at 1 atm pressure and 300 k temperature after the completion of the reaction : [R = 0.0821 L atom mol–1 K–1]
H2SO4 + Na2CO3 → Na2SO4 + H20 + CO2
Munni Devi asked • 2 hours agoIn photoelectric phenomenon, the number of photo electrons emitted depends on- a)The intensity of incident radiation
- b)The frequency of incident radiation
- c)The velocity of incident radiation
- d)The work function of photo cathode
Correct answer is option 'A'. Can you explain this answer?
In photoelectric phenomenon, the number of photo electrons emitted depends on
a)
The intensity of incident radiation
b)
The frequency of incident radiation
c)
The velocity of incident radiation
d)
The work function of photo cathode
Tasleem Sharafat asked • 2 hours agoA parallel plate capacitor has its plate horizontal with air occupying the space between the plates. The upper plate is fixed with a rigid support and the lower one is connected to a spring as shown. The distance between the plates is d1. Now the capacitor is connected with an electric source having voltage V. The separation between the plates changes to d2 at equilibrium. The mass of lower plate is ‘m’ and cross-sectional area of each plate is A.
Q. The maximum voltage Vm for a given k for which an equilibrium exists is ... more
A parallel plate capacitor has its plate horizontal with air occupying the space between the plates. The upper plate is fixed with a rigid support and the lower one is connected to a spring as shown. The distance between the plates is d1. Now the capacitor is connected with an electric source having voltage V. The separation between the plates changes to d2 at equilibrium. The mass of lower plate is ‘m’ and cross-sectional area of each plate is A.
Q.
The maximum voltage Vm for a given k for which an equilibrium exists is
Vivek Verma asked • 2 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 n is a positive integer then 32n + 7 is divisible by 8
Reason (R): G.C.F. of 16 and 88 is 8- 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?
Assertion (A): If n is a positive integer then 32n + 7 is divisible by 8
Reason (R): G.C.F. of 16 and 88 is 8
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.
Darshan asked • 2 hours agoThe count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half-life of material and the total counts (approximately) in the first half life period, respectively are [CPMT 1986] 
- a) 4h, 9000
- b) 3h, 14000
- c) 3h, 235
- d) 3h, 50
Correct answer is option 'B'. Can you explain this answer?
The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half-life of material and the total counts (approximately) in the first half life period, respectively are [CPMT 1986]
a)
4h, 9000
b)
3h, 14000
c)
3h, 235
d)
3h, 50
The function f (x) is
Charan Singh asked • 3 hours agoOn heating a liquid of coefficient of cubical expansion g in a container having coefficient of linear expansion g / 3, the level of liquid in the container will [EAMCET 1993]- a) Rise
- b) Fall
- c) Will remain almost stationary
- d) It is difficult to say
Correct answer is option 'C'. Can you explain this answer?
On heating a liquid of coefficient of cubical expansion g in a container having coefficient of linear expansion g / 3, the level of liquid in the container will [EAMCET 1993]
a)
Rise
b)
Fall
c)
Will remain almost stationary
d)
It is difficult to say
Satyam asked • 3 hours agoThe figure gives experimentally measured B vs. H variation in a ferromagnetic material. The retentivity ,
co-ercivity and saturation, respectively, of the material are 
- a) 1.0 T, 50 A/m and 1.5 T
- b)150 A/m, 1.0 T and 1.5 T
- c) 1.5 T, 50 A/m and 1.0 T
- d) 1.5T, 50 A/m and 1.0 T
Correct answer is option 'A'. Can you explain this answer?
The figure gives experimentally measured B vs. H variation in a ferromagnetic material. The retentivity ,
co-ercivity and saturation, respectively, of the material are
co-ercivity and saturation, respectively, of the material are
a)
1.0 T, 50 A/m and 1.5 T
b)
150 A/m, 1.0 T and 1.5 T
c)
1.5 T, 50 A/m and 1.0 T
d)
1.5T, 50 A/m and 1.0 T
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