List of top Questions asked in VITEEE- 2008

Which of the following sets consists only of essential amino acids ?

Which of the following is not a characteristic of transition elements ?

The continuous phase contains the dispersed phase throughout, Example is

Milk changes after digestion into :

Let [ ] denote the greatest integer function and f (x) = [tan$^2$ x]. Then

Which of the following is ketohexose ?

$Cl - P - Cl$ bond angles in $PCl_5$ molecule are

Alkyl cyanides undergo Stephen reduction to produce

$\begin{bmatrix}0&a\\ b&0\end{bmatrix}^{^4}=I$, then

A spherical balloon is expanding. If the radius is increasing at the rate of $2$ centimeters per minute, the rate at which the volume increases (in cubic centimeters per minute) when the radius is $5$ centimetres is

Identify the INCORRECT statement regarding a superconducting wire

An observer $A$ sees an asteroid with a radioactive element moving by at a speed $=0.3\, c$ and measures the radioactivity decay time to be $T_{A}$. Another observer $B$ is moving with the asteroid and measures its decay time as $T_{B} .$ Then $T_{A}$ and $T_{B}$ are related as

A certain radioactive material $_{Z} X ^{A}$ starts emitting $\alpha$ and $\beta$ particles successively such that the end product is $_{z-3} Y ^{A-8}$. The number of $\alpha$ and $\beta$ particles emitted are

$^{234}U $ has $92$ protons and $234$ nucleons total in its nucleus. It decays by emitting an alpha particle. After the decay it becomes

Area enclosed by the curve $\pi\left[4\left(x-\sqrt{2}\right)^{2} +y^{2}\right]=8$ is

Anisole is the product obtained from phenol by the reaction known as

Three resistances of $4 \,\Omega$ each are connected as shown in figure. If the point $D$ divides the resistance into two equal halves, the resistance between point $A$ and $D$ will be

Which will not go for diazotization ?

The value of $f(0)$ so that $\frac{\left(-e^{x} +2^{x}\right)}{x}$may be continuous at $x = 0$ is

The value of $\int^{^a}_{0}\sqrt{\frac{a-x}{x}}dx$ is

A solid sphere of radius $R_{1}$ and volume charge density $\rho=\frac{\rho_{0}}{r}$ is enclosed by a hollow sphere of radius $R_{2}$ with negative surface charge density $\sigma$, such that the total charge in the system is zero, $\rho_{0}$ is a positive constant and $r$ is the distance from the centre of the sphere. The ratio $\frac{R_{2}}{R_{1}}$ is

A Zener diode has a contact potential of $1\, V$ in the absence of biasing. It undergoes Zener breakdown for an electric field of $10^{6} \,V / m$ at the depletion region of $p-n$ junction. If the width of the depletion region is $2.5 \,\mu\, m$, what should be the reverse biased potential for the Zener breakdown to occur?

A $p-n$ junction has acceptor impurity concentration of $10^{17}\, cm ^{-3}$ in the $P$ side and donor impurity concentration of $10^{16} cm ^{-3}$ in the $N$ side. What is the contact potential at the junction? $(k T=$ thermal energy, intrinsic carrier concentration $\left.n_{i}=1.4 \times 10^{10}\, cm ^{-3}\right)$

The radioactivity of a certain material drops to $\frac{1}{16}$ of the initial value in $2$ hours. The half life of this radionuclide is