List of practice Questions

Nylon 6 is prepared from

\Mien borax is heated dining borax bead test along with CoO (Cobalt Oxide) on a loop of platinum (Pt) wire, it swells up and produces a blue colored bead. Which of the following compounds is responsible for the blue color?

The volume of $O_2$ (in L) that can be produced at STP by heating 112 g of $ {KClO_3}$ is approximately (Molar mass of $ {KCIO_3 = 122.6 \, g \, mol^{-1}}$)

Producer gas is a mixture of

The number of resonance structures possible for anisole is

A gill throws a stone horizontally from the roof of a house 12 in above the ground with a speed of If 15 m/s. Neglecting air resistance, the time it takes tor the stone to reach the ground is

A rocket is about to launch upwards from its platform. The engine ejects gas at a rate of 2100 kg/s and the molecules are expelled at 50 m/s. If the above condition is just sufficient to make it rise upwards, the mass of the rocket is (Assume $g = 10\, ms^2$)

Consider a 50 in high water falls, with water flowing at a rate of $1.2 \times 10^6 \, kg/s$. Using the power generated due to this process, assuming 100% efficiency, the number of 60W bulbs that can be light up is

In analysing the problems of inelastic collisions, the law of conservation of momentum and the law of conservation of mechanical energy are to be employed Since the laws of conservation of momentum and mechanical energy are fundamental laws, they should hold good in any situation. Which of the following is true?

Elastic strain energy of 10 J is stored in a loaded copper rod of cross-sectional area $2 times 10^{-4} m^2$ and length 0,2 in, Hie Young?? modulus for copper is 125 GPa. The load on the copper rod in kN is

The CGS unit of coefficient of viscosity is

An electron moves in a combined electric and magnetic field, the electric field being $1.5 \times 10^3 \, V/m$ and magnetic field being 0.75 T. If the resultant force on the moving electron is to be zero, the minimum velocity of the electron in km s is

Which of the set has different dimensional formulae :

Hie equation of motion of a panicle is given by $x(t) = 2t^3 + t^2 + 4t$. Then the average velocity of the particle between the time t = 3 s to t = 5 s is

Consider a ship traveling due east along the equator with velocity $v_0$. If southeastern wind blows at an angle of $' \phi '$ to the equator with velocity $'v'$, the wind velocity relative to the ship $v'$ and the angle between the equator and the wind direction in the reference frame fixed to the ship are

A cannon ball is fired from a building of height h at the sea shore with a velocity v at an angle of a upwards from the horizontal, targeting a ship at a horizontal distance of S from the shore, as shown in the figure. If 'g' denotes the acceleration due to gravity, tan $\alpha$ governed by the quadratic equation is

Arrange the following steps in the order of their occurance in the lytic cycle of a phage i) Maturation phase ii) Penetration phase iii) Attacinnenr iv) Release phase v) Biosynthesis The correct sequence is

In gel electrophoresis, DNA molecules can be separated by forcing them to move towards the anode under an electr ic field through a matrix. This is because DNA fragments are positively charged. Which of the following is true?

Which of the following has ATP-ase activity in flagella

Match the following lists: The correct answer is

Study the following lists : The correct answer is

Let $z_1$ and $z_2$ be complex numbers such that $z_1 \neq z_2$ and $| z_1| = | z_2 |$ . If Re $(z_1) > 0$ and $Im (z_2) < 0 $ ,then $\frac{z_1+ z_2}{z_1 - z_2}$ is

The least positive integer $n$ such that $\begin{pmatrix}\cos \frac{\pi}{4}&\sin \frac{\pi}{4}\\ -\sin \frac{\pi}{4}&\cos \frac{\pi}{4}\end{pmatrix} ^{n }$ is an identity matrix of order $2$ is

For $0 \leq p \leq 1$ and for any positive $a, b$ let $I(p) = (a + b)^p, J(p) = a^p + b^p$, then

Let $\vec{\alpha} . \vec{\beta} , \vec{\gamma}$ be three unit vectors such that $\vec{\alpha} . \vec{\beta} = \vec{\alpha} . \vec{\gamma} = 0 $ and the angle between $\vec{\beta}$ and $\vec{\gamma}$ is $30^{\circ}$ . Then $\vec{\alpha} $ is