List of top Questions asked in VITEEE

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelength \( \lambda_1 : \lambda_2 \) emitted in the two cases is:

In a common emitter transistor amplifier \( \beta = 60 \), \( R_o = 5000 \, \Omega \) and internal resistance of a transistor is 500 \( \Omega \). The voltage amplification of amplifier will be:

A machine gun has a mass 5 kg. It fires 50 gram bullets at the rate of 30 bullets per minute at a speed of 400 m/s. What force is required to keep the gun in position?

The activity of a radioactive sample is measured as 9750 counts per minute at \( t = 0 \) and as 975 counts per minute at \( t = 5 \) minutes. The decay constant is approximately:

The equivalent capacitance between a and b for the combination of capacitors shown in figure where all capacitances are in microfarad is:

Two coils have a mutual inductance 0.005 H. The current changes in the first coil according to equation \( I = I_0 \sin \omega t \), where \( I_0 = 10A \) and \( \omega = 100\pi \, \text{radian/sec} \). The maximum value of e.m.f. in the second coil is:

The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length, its new resistance will be:

A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is:

Which of the following is the correct lens formula?

The magnetic field at a point due to a current carrying conductor is directly proportional to:

For which one of the following systems at equilibrium, at constant temperature will the doubling of die volume cause a shift to the right?

Given that the equilibrium constant for the reaction $ {2SO2(g) + O2(g) <=> 2SO3(g)}$ has a value of278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature? $ {SO3(g) <=> SO2(g) + \frac{1}{2} O2(g)}$

Which of the following compounds is formed when a mixture of $K_2Cr_2O_7$ and NaCl is heated with cone. $H_2SO_4$ ?

Compound 'A' of molecular formula $C_4H_{10}O$ on treatment with Lucas reagent at room temperature gives compound ?B\ When compound ?B? is heated with alcoholic $KOH$, it gives isobutene. Compound ?A? and ?B? are respectively

In a common emitter transistor amplifier $\beta = 60, \,R_o = 5000\, \Omega$ and internal resistance of a transistor is $500 \,\Omega$Voltage amplification. The voltage amplification of amplifier will be

The resistance of $0.01\, N$ solution of an electrolyte was found to be $220\, ohm$ at $298\, K$ using a conductivity cell with a cell constant of $0.88\,cm^{-1}$. The value of equivalent conductance of solution is -

If A and B are events such that P(A) = 0.42, P(B) = 0.48 and P(A and B) = 0.16. then, I. P(not A) = 0.58 II. P(not B) = 0.52 III. P(A or B) = 0.47

Ionisation energy of $He^+$ is $19.6 \times 10^{-18}\, J$ atom$^{-1}$. The energy of the first stationary state $(n= 1)$ of $Li^{2+}$ is

The molecular formula of diphenyl methane, How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?

For the reaction $2N_2O_5 \to 4NO_2 + O_2$, rate and rate constant are $1.02 \times 10^{-4}$ mol $lir^{-1}$ $sec^{-1}$ and $3.4 \times 10^{-5}$ $sec^{-1}$ respectively then concentration of $N_2O_5$ at that time will be

An element occuring in the bcc structure has $12.08 \times 10^{23}$ unit cells. The total number of atoms of the element in these cells will be

In Williamson synthesis if tertiary alkyl halide is used than

The correct order of the thermal stability of hydrogen halides (H-X) is

The reagent (s) which can be used to distinguish acetophenone from benzophenone is (are)

In case of nitrogen, $NCl_3$ is possible but not $NCl_5$ while in case of phosphorus, $PCl_3$ as well as $PCl_5$ are possible. It is due to