List of practice Questions

The microorganisms involved in floe formation during sewage treatment are
Which of the following statements are collect? (i) NaH(s) reacts violently with water to form $NaOH$ and $H_2$ (ii) An example for electron rich hydride is $NH_3$ (iii) Nickel forms saline hydride
The temperature coefficient of a reaction is 2. When the temperature is increased from $30^{\circ} C$ to $90^{\circ}C$, the rate of reaction is increased by
A cup of tea cools from $65.5^{\circ} C$ to $62.5^{\circ} C$ in 1 minute in a room at $22.5^{\circ} C$. How long will it take to cool from $46.5^{\circ} C$ to $40.5^{\circ} C$ in the same room ?
The correct Biot-Savart law in vector form is
Ohm?? Law is applicable to
Phenol can be distinguished from ethanol by the reagent
First overtone frequency of a closed pipe of length $'l_1'$ is equal to the $2^{nd}$ harmonic frequency of an open pipe of length $'l_2'$ .The ratio $\frac{l_1}{l_2} = $
The work done to move a charge on an equipotential surface is
Two capacitors of $3 \, \mu F$ and $6 \, \mu F$ are connected in series and a potential difference of 900 V is applied across the combination. They are then disconnected and reconnected in parallel. The potential difference across the combination is
The locus represented by $xy + yz = 0$ is
The probability of happening of an event A is 0.5 and the of B is 0.3 .If A and B are mutually exclusive events, then the probability of neither A nor B is
Which option is valid for a zero order reaction?
Which of the following represents isotope, isobar, isotones respectively?
The correct order of reactivity for the addition reaction of the following carbonyl compounds with ethylmagnesium iodide is
What amount of electricity can deposit $1$ mole of $Al$ metal at cathode when passed through molten $AlCl_3$
The stress along the length of a rod (with rectangular cross section) is $1\%$ of the Young's modulus of its material. What is the approximate percentage of change of its volume ? (Poisson's ratio of the material of the rod is $0.3$)
In a triangle $ABC$, the sides $AB$ and $AC$ are represented by the vectors $3 \hat{i} + \hat{j} + \hat{k}$ and $\hat{i} + 2 \hat{j} + \hat{k}$ respectively. Calculate the angle $\angle ABC$
Which of the following has the strongest H-bond ?
The bob of a pendulum of mass �$m$�, suspended by a inextensible string of length �$L$� as shown in the figure carries a small charge �$q$�. An infinite horizontal plane conductor with uniform surface charge density $�\sigma�$ is placed below it. What will be the time period of the pendulum for small amplitude oscillations ?
A circular coil carrying current 'I' has radius 'R' and magnetic field at the centre is 'B' . At what distance from the centre along the axis of the same coil, the magnetic field will be $\frac{B}{8}$ ?
A sphere of mass 'm' moving with velocity 'v' collides head-on on another sphere of same mass which is at rest. The ratio of final velocity of second sphere to the initial velocity of the first sphere is (e is coefficient of restitution and collision is inelastic)
Which among the following oxoacids of phosphorus shows a tendency of disproportionation?
In which among the following solids, Schottky defect is NOT observed?
What is the number of donar atoms in dimethylglyoximato ligand?