List of practice Questions

The reaction involved in the oil of winter green test is salicylic acid ${->[{\Delta}][{\text { Conc. } H _{2} SO _{4}}]}$ product. The product is treated with $Na _{2} CO _{3}$ solution. The missing reagent in the above reaction is

The carbon-carbon bond length in Benzene is

$ {CH_3COOH ->[LiA/H_4] X ->[Cu][300 ^{\circ}C] Y ->[dilute][NaOH] Z}$ In the above reaction $Z$ is

A compound of $'A'$ and $'B'$ crystallises in a cubic lattice in which the $'A'$ atoms occupy the lattice points at the corners of the cube. The $'B'$ atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is

A 6% solution of urea is isotonic with

In the electrolysis of acidulated water, it is desired to obtain $1.12\, cc$ of Hydrogen per second under $S.T.P.$ condition. The current to be passed is

$10^{-6}\, M\, NaOH$ is diluted $100$ times. The $pH$ of the diluted base is

The magnetic dipole moment of a current loop is independent of

Near a circular loop of conducting wire as shown in the figure an electron moves along a straight line. The direction of the induced current if any in the loop is

The angle of minimum deviation for an incident light ray on an equilateral prism is equal to its refracting angle. The refractive index of its material is

A graph of pressure versus volume for an ideal gas for different processes is as shown. In the graph curve $OC$ represents

The spectral series of the hydrogen atom that lies in the visible region of the electromagnetic spectrum

The work done by a force acting on a body is as shown in the graph. The total work done in covering an initial distance of $20\,m$ is

The resistance of a wire at $300 \, K$ is found to be $0.3 \, \Omega$. If the temperature co-efficient of resistance of wire is $1.5 \times 10^{-3} K^{-1}$, the temperature at which the resistance becomes $0.6\, \Omega$ is

Three concurrent co-planar forces $1\,N, 2\,N$ and $3\,N$ acting along different directions on a body

In fog, photographs of the objects taken with infra-red radiations are more clear than those obtained during visible light because

The diagram of the section of a maize grain is given below. Identify the parts labelled A. B. C and D.

The moment of inertia of a circular ring of radius $'r'$ and mass $'M'$ about diameter is

A body of mass $'m'$ moving along a straight line covers half the distance with a speed of $2\, ms^{-1}$. The remaining half of the distance is covered in two equal time intervals with a speed of $3\, ms^{-1}$ and $5\, ms^{-1}$ respectively. The average speed of the particle for the entire journey is

Two solid pieces, one of steel and the other of aluminium when immersed completely in water have equal weights. When the solid pieces arc weighed in air

Ferromagnetic materials used in a transformer must have

In ruby laser, the stimulated emission is due to transition from

For a first order reaction, the time required for $99.9\%$ of the reaction to take place is nearly

In which of the following molecules / ions $BF _{3},\,NO _{2}^{-}, NH _{2}^{-}$ and $H _{2} O$, the central atom is $sp ^{2}$ hybridized ?

What is the dominant intermolecular force on bond that must be overcome in converting liquid $CH_3 OH$ to a gas?