List of practice Questions

Charges $2q,\, -q$ and $-q$ lie at the vertices of a triangle. The value of $E$ and Vat the centroid of equilateral triangle will be

If the excess pressure inside a soap bubble is balanced by oil column of height $ 2\,mm, $ then the surface tension of soap solution will be ( $ r=1\,cm $ and density $ d=0.8\, g/\,cc $ )

If the velocity of a particle is given by $ v=(180-16x)^{1/2}\,m/s$ . then its acceleration will be

A piece of ice is floating in a jar containing water. When the ice melts, then the level of water...... :

$1\, mol$ of $H _{2} SO _{4}$ is mixed with $2$ moles of $NaOH$. The heat evolved will be

One mole of a perfect gas expands isothermally to ten times of its original volume. The change in entropy is

For the reaction, $N_{2}+3 H_{2} 2 N H ; \Delta H=$ ?

A wire of length $ L $ and area of cross-section $ A $ is stretched through a distance $ x $ metre by applying a force $ F $ along length, then the work done in this process is: (Y is Youngs modulus of the material)

$ 800\,cc $ volume of a gas having $ \gamma =\frac{5}{3} $ is suddenly compressed adiabatically to $ 100\,cc $ . If the initial pressure is P, then the final pressure will

With what velocity should an observer approach stationary sound source, so that the apparent frequency of sound appear to be double of the initial frequency? (given velocity of sound $= v$)

Infinite charges of magnitude $q$ each are lying at $ x=1,2,4,8,... $ metre on $X$-axis. The value of intensity of electric field at point $ x=0 $ due to these charges will be

The ratio of electric fields on the axis and at equator of an electric dipole will be

A body starts to fall freely under gravity. The distance covered by it in first, second and third second are in ratio

$4\, g$ of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave $5\, g$ of its oxide. The equivalent weight of copper is :

The correct name of the compound $\left[ Cu \left( NH _{3}\right)_{4}\right]\left( NO _{3}\right)_{2}$ according to IUPAC system is

Number of atoms of oxygen present in $10.6\, g$ of $Na _{2} CO _{3}$ will be

The wave theory of light was given by

On increasing the plate separation of a charged condenser, the energy

Volume of $0.1\, M\, K _{2} Cr _{2} O _{7}$ required to oxidize $35\, mL$ of $0.5\, M\, FeSO _{4}$ solution is

Some electric bulbs are connected in series across a $ 220\,V $ supply in a room. If one bulb is fused, then remaining bulbs are connected again in series across the same supply. The illumination in the room will be

In junction diode, the holes are because of

Identify the correct sequence of increasing number of a bonds in the structures of the following molecules: I. $ {{H}_{2}}{{S}_{2}}{{O}_{6}} $ II. $ {{H}_{2}}S{{O}_{3}} $ III. $ {{H}_{2}}{{S}_{2}}{{O}_{5}} $

In which of the following, there are 3 bp and 2 lp?

Xenon hexaflouride reacts with silica to form a xenon compound X. The oxidation state of xenon in X is:

Sulphur reacts with chlorine in 1:2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. What is the hybridisation state of central atom in the anion of F?