List of practice Questions

The mobility of free electrons (charge = $e$, mass = $m$ and relaxation time = $ \tau $ .) in a metal is proportional to
Why do calcium ions makes water hard but sodium ion does not?
Formation of methyl tertiary butyl ether by the reaction of sodium tertiary butoxide and methyl bromide involves
If the radius of a nucleus of mass number $3$ is $R$ ,then the radius of a nucleus of mass number $81$ is
Faraday's constant is defined as
German silver is an alloy of
The thermal decomposition of a molecule shows first order kinetics. The molecule decomposes 50% in 120 min. How much time it will take to decompose 90%?
Mean free path of a gas molecule is
The secondary precursors of photochemical smog are
Identify the false statement
The complex $[CoF_{6}]^{4-}$ is
A Carnot cycle has the reversible processes in the following order
$IUPAC$ name of the complex $K_{3}\left[A l\left(C_{2} O_{4}\right)_{3}\right]$ is
Dual behaviour of matter was proposed by
A cord is used to lower vertically a block of mass $M$ by a distance $d$ with constant downward acceleration $\frac{g}{4}$. Work done by the cord on the block is
Which one of the following forms propanenitrile as the major product?
The general solution of $1+\operatorname{Sin}^{2} x=3 \operatorname{Sin} x \cdot \operatorname{Cos} x, \operatorname{Tan} x \neq \frac{1}{2}$ is ......
A space vector makes the angles $150^\circ$ and $60^\circ$ with the positive direction of $X -$ and $Y-$axis. The angle made by the vector with the positive direction of $Z-$axis is .............
A battery of emf 2.1 V and internal resistance is shunted for 5 s by a wire of constant resistance 0.02 $ \Omega $ ,mass 1 g and specific heat 0.1 cal/g/?C. The rise in the temperature of the wire is
A torque of $10^{-5}$ Nm is required to hold a magnet at $90^\circ$ with the horizontal component of the earth's magnetic field. The torque required to hold it at $30^\circ$ will be
Zeolite used to soften hardness of water is, hydrated
A person suffering from a disease caused by Plasmodium, experiences recurring chills and fever at the time when
The derivative of $e^{ax} \cos\,bx$ with respect to $x$ is $re^{ax}$ $\cos\, (bx-Tan^{-1} \frac {b}{a})$ When $a >0, b > 0$,the value of $r$ is ............
The $n^{th}$ term of the series $1+3 + 7 + 13 + 21 + $ is $9901$. The value of $n$ is ................
Which one of the following statements about certain given animals is correct?