List of practice Questions

Two electric bulbs are connected one by one across potential difference V. At that time power consumed in them are $P_1 \, and \, P_2 $ respectively. Now, if potential difference V is applied across series combination of these bulbs, what will be total power consumed ?
The deflection in a moving coil galvanometer falls from 50 divisions to 10 divisions,when a shunt of $ 2? $ is connected with it. The resistance of galvanometer coil is
Conversion of chlorobenzene to phenol involves
The internal resistance of a cell of emf 4 V is $ 0.1 \Omega $ It is connected to a resistance of $ 3.9 \Omega $. The voltage across the cell will be
The ratio of cross-sectional areas of two conducting wires made up of same material and having same length is 1 : 2. What will be the ratio of heat produced per second in the wires, when same current is flowing in them?
Colours in thin films are due to
When chlorine reacts with dil. $NaOH$ under cold conditions, the oxidation state of chlorine changes from zero to
A rocket of mass $100 \,kg$ burns $0.1\, kg$ of fuel per sec. If velocity of exhaust gas is $1 \,km/s^{-1}$, then it lifts with an acceleration of
How many stereoisomers does this molecule have? $CH_3CH = CHCH_2CHBrCH_3$
The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of
A beaker of radius $15\, cm$ is filled with a liquid of surface tension $0.75\, N/m$. Force across an imaginary diameter on the surface of the liquid is
Force required to move a mass of $1 \,kg$ at rest on a horizontal rough plane ( $ \mu =0.1 $ and $ g=9.8\,m{{s}^{2}} $ ) is
If the $m^{th}$ term and the nth term of an $AP$ are respectively $\frac{1}{n}$ and $\frac{1}{m}$, then the $(mn )^{th}$ term of the $AP$ is
The coefficient of $ x^{-10}$ in $\left(x^{2} - \frac{1}{x^{3}}\right)^{10}$ is
The number of ways four boys can be seated around a round-table in four chairs of different colours is
The value of $\left(1-\omega+\omega^{2}\right)^{5} + \left(1+\omega -\omega^{2}\right)^{5}, $ where $\omega$ and $\omega^2$ are the complex cube roots of unity, is
A strong base can abstract an $\alpha$-hydrogen from
The function $f(x ) = xe^{1-x}$ is
In a given shell the order of screening effect is
In transforming $0.01$ mole of $PbS$ to $PbSO _{4}$, the volume of ' $10$ volume' $H _{2} O _{2}$ required will be
Auxin synthesis occurs is
A shell of mass $10\, kg$ is moving with a velocity of $ 10\,ms^{-1}$ when it blasts and forms two parts of mass $9 \,kg$ and $1 \,kg$ respectively. If the $1^{st}$ mass is stationary, the velocity of the $ 2^{nd} $ is
Area enclosed by the curve $\pi\left[4\left(x-\sqrt{2}\right)^{2} +y^{2}\right]=8$ is
Number of moles of $MnO^{-}_4$ required to oxidise one mole of ferrous oxalate completely in acidic medium will be
A particle shows distance - time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point