List of practice Questions

The element with the atomic number 118, will be
Elemental silicon to be used as a semiconductor is purified by
The plot of concentration of the reactant versus time for a reaction is a straight line with a negative slope. This reaction follows
In a reversible reaction, the energy of activation of the forward reaction is 50 kcal. The energy of activation for the reverse reaction will be
The structure and hybridisation of $Si(CH_3)_4$ is
The momentum of a particle having a de-Broglie wavelength of $10^{17}$ m is (Given, $h = 6.625 \times 10^{-34}$ m)
In reference to biological role, $Ca^{2+}$ ions are important in
Sucrose in water is dextrorotatoiy, $[\alpha]_D$ =+ 66.4$^{\circ}$ when boiled with dil. HCl, the solution becomes leavo rotatory, $[\alpha]_D$ = - 39.9$^{\circ}$. In this process the sucrose breaks into
0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance ? (Density of $ H_2 = 0.089$)
A moving body of mass $m$ and velocity $3\, km / hr$. Collides with a body at rest and of mass $2\, m$ and then sticks to it. Now the combined mass starts to move, then the combined velocity will be :
A \(10\ eV\) electron is circulating in a plane at right angles to a uniform field at magnetic induction \({10}^{- 4}\ Wb/m^2\) (= \(1.0\) gauss), the orbital radius of electron is
What will be the equivalent resistance between the two points A and D?
What will be the formula of mass of the earth in terms of g, R and G ?
A ball is dropped from a spacecraft revolving around the earth at a height of 120 km. What will happen to the ball?
A point charge + q is placed at the centre of a cube of side $l$. The electric flux emerging from the cube is
The energy stored in a capacitor of capacity C and potential V is given by
A body dropped from a height h with initial velocity zero, strikes the ground with a velocity 3 m/s. Another body of same mass dropped from the same height h with an initial velocity of 4 m/s. The final velocity of second mass, with which it strikes the ground is
A 5 A current is passed through a solution of zinc sulphate for 40 min. The amount of zinc deposited at the cathode is
A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength $ 20 V m^{-1} $ and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons?
The exchange of genetic material between chromatids of paired homologous chromosomes during first meiotic division is called
Which of the following has zero dipole moment?
The basic character of hydrides of the 15 group elements decreases in the order
Which of the following is the direct ancestor of Homo sapiens?
A linear harmonic oscillator of force constant $ 2 \times 10^6 $ N/m and amplitude 0.01 m has a total mechanical energy of 160 J. Show that its (a) maximum potential energy is 160 J (b) maximum kinetic energy is 100J
The ionic product of water at $25^{\circ} C$ is $10^{-14}$. Its ionic product at $90^{\circ} C$ will be