List of practice Questions

An electron enters uniform electric field maintained by parallel plates and of value $ EV{{m}^{-1}} $ with a velocity $ v\text{ }m{{s}^{-1}}, $ the plates are separated by a distance $ d $ metre, then acceleration of the electron in the field is:

An electron, placed in an electric field, experiences a force F of $1\, N.$ What are the magnitude and direction of the electric field E at the point where the electron is located $(e = 1.6 \times 10^{-19} C)$ ?

$CO^-$ ion moving with kinetic energy of $20\, keV$ dissociates into $O^-$ and $C$ which move along the parent ion direction. Assuming no energy is released during dissociation, the kinetic energy of the daughters $(K.E)_{O^-}$ and $(K.E)_C$ are related as

Find the total capacitance and total charge on the capacitors

For an ideal gas, the specific heat at constant pressure $C_P$ is greater than the specific heat at constant volume $C_V$ . This is because

A $ 2\mu C $ charge moving around a circle with a frequency of $ 6.25\times {{10}^{12}}Hz $ produces a magnetic field $6.28\, T$ at the centre of the circle. The radius of the circle is

A common emitter amplifier gives an output of $ 3 \,V $ for an input of $ 0.01 \,V $ . If $ \beta $ of the transistor is $100$ and the input resistance is $ 1\text{ }k\Omega , $ then the collector resistance is

1 mole of $FeSO_4$ (atomic weight of Fe is $55.84 \, g \, mol^{-1}$) is oxidized to $Fe_2(SO_4)_3$. Calculate the equivalent weight of ferrous ion

An alloy of transition metal containing a non transition metal as a constituent is

Gd$(64)$ has _____ unpaired electrons with sum of spin _____

Propanal on reaction with dilute sodium hydroxide forms:

A dye that imparts different colours to the fabric with different metal ions is called

An important industrial solvent, also a laboratory reagent called 2-butanone is nothing but:

An invert sugar is

Aniline is treated with $NaNO_2 / HCl$ at $0^{\circ}C$ to give compound $X$ which on treatment with cuprous cyanide give another compound $Y$. When compound $Y$ is treated with $H_2/Ni$ compound $Z$ is obtained. Compound $Z$ is

Aryl halides doesn't undergo nucleophilic substitution reactions under ordinary conditions because of 1. approach of nucleophile is retarded 2. carbon carrying halogen atoms is $sp^3$ - hybridised 3. the substrate molecule is destabilised due to resonance 4. partial double bond character between carbon and halogen

Ethylene glycol reacts with excess of $PCl_5$ to give

Facial and meridional isomerism will be exhibited by

Finkelstein reaction is an example of

For Balmer series in the spectrum of atomic hydrogen, the wave number of each line is given by $\bar\upsilon = R_H (\frac{1}{n_1^2} - \frac{1}{n_2^2})$ where $R_H$ is a constant and $n_1$and $n_2$ are integers. Which of the following statement(s) is (are) correct? 1. As wavelength decreases, the lines in the series converge 2. The integer $n_1$ is equal to $2$ 3. The ionisation energy of hydrogen can be calculated from the wave number of these lines 4. The line of longest wavelength corresponds to $n_2 = 3$

Reaction of butanone with methyl magnesium bromide following by hydrolysis gives

Solubility product $(K_{sp}) $ of saturated $PbCl_2$ in water is $1.8 \times 10^{-4} \, mol^3 \, dm^{-9}$. What is the concentration of $Pb^{2+}$ in the solution?

The boiling point of methanol is greater than methyl thiol because

If $\begin{pmatrix}2x+y&x+y\\ p-q&p+q\end{pmatrix}=\begin{pmatrix}1&1\\ 0&0\end{pmatrix}$ , then $(x, y, p, q) $ equals

Suppose that two persons $A$ and $B$ solve the equation $ {{x}^{2}}+ax+b=0 $ . While solving $A$ commits a mistake in the coefficient of $ x $ was taken as $15$ in place of $-9$ and finds the roots as $ -7 $ and $ -2 $ . Then, the equation is