List of practice Questions

Among the following, the correct graphical representation of electric intensity as a function of distance from the centre of a uniformly charged conducting sphere is shown in
An electron c penetrates through a thin plate A and enters the electric field region between parallel plates A and B. It gets slowed down Three other particles-proton (p), alpha particles $(\alpha)$ and beta particles $(\beta^-)$ - similarly penetrate through either plate A or plate B as shown. The correct statement as regards the speed of the particles is
Gauss's law can't be used to calculate electric field near an electric dipole. Electric dipole don't have symmetrical charge distribution.
The total electric flux emanating from a closed surface enclosing an $\alpha$-particle (e = electronic charge) is
If the roots of the equation $x^2 + ax + b = 0$ are $c$ and $d$, then one of the roots of the equation $x^{2}+\left(2c+a\right)x+c^{2}+ac+b=0$ is
What is the time (in sec) required for depositing all the silver present in $125\, mL$ of $1\, M \, AgNO _{3}$ solution by passing a current of $241.25 \, A$? ($IF = 96500$ coulombs)
A small drop of mercury is spherical but bigger drops are oval in shape. surface tension of liquid decreases with increase in temperature.
The unit of surface tension is
$Mg ^{2+}$ is isoelectronic with
Which one of the following species is diamagnetic in nature?
The number of values of k for which the linear equations $4x + ky + 2z = 0$ , $kx + 4y + z = 0$ and $2x + 2y + z = 0$ possess a non-zero solution is
In the given network, the value of $C$, so that an equivalent capacitance between $A$ and $B$ is $3\mu F$, is
Charges $5 \mu C$ and $10 \mu C$ are placed 1 m apart. Work done to bring these charges at a distance 0.5 m from each other is $(k = 9\times 10^9 SI)$
A hollow metal sphere of radius 10 cm is charged such that the potential on its surface becomes 80 V. The potential at the centre of the sphere is
A $600 \,pF$ capacitor is charged by $200 \,V$ supply. It is then disconnected from the supply and is connected to another $300 \,pF$ capacitor. The electrostatic energy lost in the process is
How many $ 1\,\mu F $ capacitors must be connected in parallel to store a charge of $1\, C$ with a potential of $110\, V$ across the capacitors?
Most stable carbocation is
In Kjeldahl's method, the nitrogen present is estimated as
Most stable carbocation is
: Methyl cyanide has higher boiling point than methyl isocyanide. : Dipole moment of methyl cyanide is higher than that of methyl isocyanide.
Which one of the following is not made of soft iron?
A bar magnet of magnetic moment $10^{4}\, J / T$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $4 \times 10^{-5}\, T$ to a direction of $60^{\circ}$ from the field will be
Magnetic force between two short magnets, when they are co-axial follows inverse square law of distance. The magnetic forces between two poles do not follow inverse square law of distance.
Which of the following substances magnetic susceptibility $\chi_{m}$ is negative?
Solubility product of ${PbCl_2}$ at ${298\, K}$ is ${1 \times 10^{-6}}$. At this temperature, solubility of ${PbCl_2\, (in\, mol/L)}$ is