List of practice Questions

In given circuit, all resistances are of $10 \Omega$. Current flowing through ammeter is
Which statement is correct for the given circuit?
Two solenoids are given - 1st has 1 turn per unit length and 2nd has n turns per unit length. Ratio of magnetic fields at their centres is
A (+)vely charged particle is placed near an infinitely long straight conductor where there is zero gravity. Then
The probability of India winning a test match against Australia is $\frac{1}{2}$ assuming independence from match to match. The probability that in a match series India�s second win occurs at third test match is
If $g(x)$ is a polynomial satisfying $g (x) g(y) = g(x) + g(y) + g(xy) - 2 $ for all real $x$ and $y$ and $g (2) = 5$ then $\Lt_{x \to 3} g(x)$ is
If $g(x)$ is a polynomial satisfying $g (x) g(y) = g(x) + g(y) + g(xy) - 2 $ for all real $x$ and $y$ and $g (2) = 5$ then $\Lt_{x \to 3} g(x)$ is
The wavenumber of the first emission line in the Balmer series of H-Spectrum is: [$R=$ Rydberg constant]
Among the following the incorrect statement is
Which one of the following reactions of xenon compounds is not feasible?
For hydrogen-oxygen fuel cell, the cell reaction is \(2H_2(g)+O_2(g)\rightarrow2H_2O(I)\), If \(\triangle{G}\degree_{f}(H_2O)=-237.2KJmol^{-1}\) then emf ofthis cell is
IUPAC name of valeric acid is
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be
One mole of an ideal gas at 300 K is expanded isothermally from an initial volume of 1 litre to 10 litres. Then $ {\Delta S (cal \, deg^{-1} \, mol^{-1})}$ for this process is : $ { (R = 2 \, cal \, K^{-1} \, mol^{-1})}$
The protein present in the hair is
Phenol undergoes electrophilic substitution more easily than benzene because
Esterification of acid chloride with ethanol is usually carried out in the presence of pyridine. The function of pyridine is
Group 15 elements have more electron gain enthalpy than group 16-elements. The correct reason for this is
Two point dipoles $p \hat{k}$ and $\frac{p}{2} \hat{k}$ are located at $(0,0,0)$ and $(1\, m , 0,2\, m )$ respectively. The resultant electric field due to the two dipoles at the point $(1 \,m , 0,0)$ is
A square current carrying loop is changed to a circular loop in time $t_1$. Then
A layer of oil with density $724\, kg/m^3$ floats on water of density $1000\, kg/m^3$. A block floats at the oil-water interface with $1/6$ of its volume in oil and $5/6$ of its volume in water, as shown in the figure. What is the density of the block?
The current in an $L-R$ circuit builds up to $\left(3 / 4^{\text {th }}\right)$ of its steady state value in $4$ seconds. The time constant of this circuit is
For a current carrying inductor, emf associated is 20mV. Now, current through it changes from 6A to 2A in 2s. The coefficient of mutual inductance is
Hologram is based on phenomenon of
The wavelength of an electron for transition from a state $n_1$ to $n_2$ is $\frac{ 9}{8R}$. Which of the following wavelengths is possible for a transition from $n_2$ to $n_1$.