List of practice Questions

A condenser of capacity $C$ is charged to a potential difference of $V_1$. The plates of the condenser are then connected to an ideal inductor of inductance $L$. The current through the inductor when the potential difference across the condenser reduces to $V_2$ is
A current loop consists of two identical semicircular parts each of radius $R$, one lying in the $x-y$ plane and the other in $x-z$ plane. If the current in the loop is $i$. The resultant magnetic field due to the two semicircular parts at their common centre is
A $0.66\, kg$ ball is moving with a speed of $100 \,m/s$. The associated wavelength will be $(h = 6.6 \times 10^{-34} \, Js)$
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by
Consider the following relations for emf of a electrochemical cell : (a) emf of cell = (Oxidation potential of anode) - (Reduction potential of cathode) (b) emf of cell = (Oxidation potential of anode) + (Reduction potential of cathod) (c) emf of cell = (Reduction potential of anode) + (Reduction potential of cathode) (d) emf of cell = (Oxidation potential of anode) - (Oxidation potential of cathode) Which of the above relations are correct ?
A circular disk of moment of inertia it is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed $\omega_i$. Another disk of moment of inertia $I_b$ is dropped coaxially onto the rotating disk. Initially the second disk has zero angular speed. Eventually both the disks rotate with a constant angular speed $\omega_f$. The energy lost by the initially rotating disc to friction is
The fruit fly Drosophila melanogaster was found to be very suitable for experimental verification of chromosomal theory of inheritance by Morgan and his colleagues because :
The genotype of a plant showing the dominant phenotype can be determined by
Vasa eflferentia are the ductules leading from
What does the electronic configuration $ 1s^2, \, 2s^2, \, 2p^ 5 , \, 3s^1 $ indicate ?
The resistance of 1 N solution of acetic acid is 250 $\Omega$, when measured in a cell of cell constant $1.15 cm ^{-1}$. The equivalent conductance (in $ohm^{-1} cm^2 equiv^{-1}) $of 1 N acetic acid is
The density of glycerol is higher than propanol due to
Which type of dyes are not used do dye nylon and polyester fibres?
The pair of straight lines $ {{x}^{2}}-3{{y}^{2}}=0 $ and the line $ x=1 $ form a triangle which is
Compound that has smell of bitter almonds is
Ethyl alcohol cannot be used as a solvent for methyl magnesium iodide because
A can filed with water is revolved in a vertical circle of radius 4 m and the water does not fall down. The time period for a revolution is about
The crystal structure can be studied by using
Two springs of spring constants $k_{1}$ and $k_{2}$ are joined in series and a mass $m$ is attached to them as shown in figure. The time-period of oscillations of the springs is
A body is projected horizontally with a velocity of $u$ $ m/s$ at an angle $ \beta $ with the horizontal. The kinetic energy at the highest point is $( \frac{ 3}{ 4} )^{th}$ of the initial kinetic energy. The value of $ \beta $ is
In a common emitter configuration, a transistor has $\beta = 50$ and input resistance $1\, k\Omega$. If the peak value of a.c. input is $0.01\, V$ then the peak value of collector current is
The function $f\left(x\right) = \sec \left[\log\left(x+\sqrt{1+x^{2}}\right)\right]$ is
The value of $\frac{\log_{3} 5 \times \log_{25} 27 \times \log_{49} 7}{\log_{81} 3}$ is
Which one of the following is employed as a tranquilizer drug ?