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Two point charges 3 × 10^{6} C and 8 × 10^{6} C repel each other by a force of 6 × 10^{3} N. If each of them is given an additional charge of 6 × 10^{6} C, then the force between them will be
Three charges 1 μC, 1μC and 2 μC are respectively kept at the vertices A, B and C of an equilateral triangle ABC of side 10 cm. The resultant force on the charge at C is
If the inward flux and outward electric flux from a closed surface respectively are 8 ×_{ }10^{3} units and 4 ×_{ }10^{3} units, then what is the net charge inside the closed surface?
A metallic solid sphere is placed in a uniform electric field as shown. Which path will the lines of force follow?
An electric dipole placed in a nonuniform electric field experiences
Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): In a cavity in a conductor, the electric field is zero.
Reason (R): Charges in a conductor reside only at its surface.
Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : The Coulomb force is the dominating force in the universe.
Reason : The Coulomb force is weaker than the gravitational force.
The potential of the electric field produced by a point charge at any point (x, y, z) is given by V = 3x^{2} + 5, where x, y and z are in metres and V is in volts. The intensity of the electric field at (–2, 1, 0) is
A capacitor of capacitance C_{1}^{ }is charged by connecting it to a battery. The battery is then removed and this capacitor is connected to a second uncharged capacitor of capacitance C_{2}. If the charge gets distributed equally on the two capacitors, then the ratio of the total energy stored in the capacitors, after connection to the total energy stored in them before connection, is
Directions: In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct answer according to the instructions given below.
Assertion: A parallel plate capacitor is charged by a battery. The battery is then disconnected. If the distance between the plates is increased, then the energy stored in the capacitor will decrease.
Reason: Work has to be done to increase the separation between the plates of a charged capacitor.
Three point charges of 1 C, 2 C and 3 C are placed at the corners of an equilateral triangle of side 1 m. The work done (in joules) in bringing these charges to the vertices of a smaller similar triangle of side 0.5 m is
Three capacitors, each of capacity 4 µF, are to be connected in such a way that the effective capacitance is 6 µF. This can be done by
A 3 μF capacitor is charged to a potential of 300 V and a 2 μF capacitor is charged to a potential of 200 V. The capacitors are then connected in parallel with plates of opposite polarity joined together. What amount of charge will flow when the plates are so connected
An insulator plate is passed through the plates of a capacitor as shown. The current
Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion: The electric flux of the electric field ∮ E.dA is zero. The electric field is zero everywhere on the surface.
Reason: The charge inside the surface is zero.
Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion: On bringing a positively charged rod near the uncharged conductor, the conductor gets attracted towards the rod.
Reason: The electric field lines of the charged rod are perpendicular to the surface of the conductor.
Two parallel, large and thin metal plates have equal surface charge densities (σ = 26.4 x 10^{12} C/m^{2}) of opposite signs. The electric field between these plates is
When a conductor is placed in an electric field; its free charge carriers adjust itself in order to oppose the electric field. This happen until
The electric field inside a dielectric decreases, when it is placed in an external electric field. This happens due to ________
The magnetic field inside a toroidal solenoid of radius R is B. If the current through it is doubled and its radius is also doubled keeping the number of turns per unit length the same; magnetic field produced by it will be:
In the given circuit, the potential difference (v) across PQ will be nearest to
(Round off up to 1 decimal place)
If the current flowing in a coil of resistance 90Ω is to be reduced to 90%, what value of resistance (in ohms) should be connected in series with it? (In integer)
A network of four resistances is connected to 9 V battery, as shown in figure. The magnitude of voltage difference between the points A and B is ___________V.
When a resistance of 5Ω is shunted with a moving coil galvanometer, it shows a full scale deflection for a current of 250 mA, however when 1050Ω resistance is connected with it in series, it gives full scale deflection for 25 volt. The resistance of galvanometer is _________ Ω.
For the following cell with hydrogen electrodes at two different pressure p_{1 }and p_{2 }
emf is given by
The correct order of thermal stability of the hydrides of group 16 elements is
Which of the following statements regarding ozone are correct?
3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?
When water is added to an aqueous solution of an electrolyte, what is the change in specific conductivity of the electrolyte?
Which of the following methods is suitable for preventing an iron frying pan from rusting?
Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on:
Why do most chemical reaction rates increase rapidly as the temperature rises?
For producing the effective collisions, the colliding molecules must posses:
The order of increasing acidic strengths of BF_{3}, BCl_{3} and BBr_{3} is:
Which of the following products is not formed when excess of ammonia reacts with sodium hypochlorite?
Which of the following is the correct order of paramagnetic behavior of transition metal ions?
A liquid which is immiscible in water was steam distilled at 95.2°C at a total pressure of 0.983 atmosphere. What is the mass of the liquid present per gram of water in the distillate?
Molar mass of the liquid is 134.3 gm/mol and vapour pressure of water is 0.84 atm.
(Round off up to 2 decimal places)
The mole fraction of a nonelectrolyte in aqueous solution is 0.07. If K_{f} is 1.86° mol^{–1} kg, the depression in freezing point ΔT_{f} is ____ °C.
(Round off up to 2 decimal places)
At room temperature, the mole fraction of a solute is 0.25 and the vapour pressure of pure solvent is 0.80 atm. The vapour pressure (in atm) is lowered by
(Round off up to 1 decimal place)
Chlorine reacts with hot and concentrated NaOH and produces compounds (X) and (Y). Compound (X) gives white precipitate with silver nitrate solution. The average bond order between Cl and O atoms in (Y) is _________. (Nearest integer)
Which of the following will be the correct spin magnetic moment value (B.M.) for the compound Hg[Co(SCN)_{4}]?
(Round off up to 2 decimal places)
The values of x which satisfy the trigonometric equation are :
If cos^{–1} x + cos^{–1} y = π/2 and tan^{–1} x – tan^{–1} y = 0, then x^{2} + xy + y^{2} is equal to
The sum of the infinite series cot^{–1} 2 + cot^{–1 }8 + cot^{–1} 18 + cot^{–1} 32 + … is equal to
If A = (a_{ij})_{3 × 3} is a matrix satisfying the equation x^{3} – 3x + 1 = 0, then
The rows and columns of matrix A will be linearly dependent if
If A and B are two matrices, such that, AB = B and BA = A, then A^{2} + B^{2} is equal to
If R is a relation from a non – empty set A to a non – empty set B, then
Let R be the relation over the set of straight lines of a plane such that l_{1} R l_{2} ⇔ l_{1} ⊥ l_{2}. Then, R is
If cos^{}^{1} x = tan^{}^{1} x, then sin(cos^{}^{1} x) is equal to
If ω is a complex cube root of unity, then the matrix is a
Let A = {X = (x, y, z)^{T} : PX = 0 and x^{2} + y^{2} + z^{2} = 1}, where P = then the set A
The void relation (a subset of A x A) on a non empty set A is:
Let A = R and A^{4} = [a_{ij}]. If a_{11} = 109, then a_{22} is equal to _______.
Let A = {1, 2, 3, 4} and R be a relation on the set A × A defined by
R = {((a, b), (c, d)): 2a + 3b = 4c + 5d}. Then the number of elements in R is __________.
Let S be the set of values of λ, for which the system of equations
6λx  3y + 3z = 4λ^{2},
2x  6λy + 4z = 1,
3x + 2y + 3λz = λ has no solution. Then is equal to ___________.
357 docs148 tests

JEE Main Part Test  5 Test  75 ques 
JEE Main Part Test  6 Test  75 ques 
Schedule and Syllabus of JEE Mock Test Series Doc  1 pages 
357 docs148 tests

JEE Main Part Test  5 Test  75 ques 
JEE Main Part Test  6 Test  75 ques 
Schedule and Syllabus of JEE Mock Test Series Doc  1 pages 