List of practice Questions

An ice-cube of density $900\, kg / m ^{3}$ is floating in water of density $1000\, kg / m ^{3}$. The percentage of volume of ice-cube outside the water is

The factor responsible for lower mercury level ina capillary tube is

Orbital is :

Which of the following is not hydrolysed?

The isoelectronic pair is

The system of equations $\alpha \, x + y + z = \alpha - 1$ $x + \alpha y + z = \alpha - 1$ $x + y + \alpha z = \alpha - 1$ has infinite solutions, if $\alpha$ is

$700\, pF$ capacitor is charged by $50\, V$ battery. Electrostatic energy is stored by it will be :

The charge on capacitors in the following figure is

A fully charged capacitor has a capacitance $'C'$. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity $s$ and mass $m$. If the temperature of the block is raised by $\Delta T$, the potential difference $V$ across the capacitance is:

A parallel plate capacitor is made by stacking $n$ equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is $C$, then the resultant capacitance is :

Two thin wire rings each having a radius $R$ are placed at a distance $d$ apart with their axes coinciding. The charges on the two rings are $+ q$ and $- q$. The potential difference between the centres of the two rings is :

The figure shows a system of two concentric spheres of radii $r_1$, and $r_2$ and kept at temperatures $T_1$ and $T_2$, respectively. The radial rate of flow of heat in a substance between the two concentric spheres, is proportional to :

The number of isomeric hexanes is:

Due to the presence of an unpaired electron, free radicals are:

Among the following the strongest nucleophile is

Which types of isomerism is shown by $2, 3$-dichlorobutane ?

If reduction factor of a tangent galvanometer is $900 \,mA$, then the current through it to produce a deflection of $ 45^{\circ} $ is

A magnetic needle is kept in a non-uniform magnetic field. It experiences:

At $90^{\circ} C$, pure water has $H _{3} O ^{+}$ion concentration of $10^{-6} mol / L ^{-1}$. The $K_{w}$ at $90^{\circ} C$ is :

For the reaction $ {2NO2(g) <=> 2\,NO(g) + O2(g)}$ $\left(K_{c} = 1.8\times10^{-6} \,at \,184^{\circ}C\right)$ $\left(R = 0.00831 \,k J/\left(mol. K\right)\right)$ When $K_{p}$ and $K_{c}$ are compared at $184^{\circ}$ C it is found that :

Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be :

What is the conjugate base of $OH^-$ ?

When $10\, mL$ of $0.1\, M$ acetic acid $(pK_{a} = 5.0)$ is titrated against $10\, mL$ of $0.1\, M$ ammonia solution $(pK_{b} = 5.0)$, the equivalence point occurs at $pH$

In uniform circular motion, the factor that remains constant is

The maximum range of a gun on horizontal terrain is $16 \,km$, if $g=10 \,m / s ^{2}$. What must be the muzzle velocity of the shell?