List of practice Questions

The correct set of four quantum numbers for the electron in the outermost subshell of $ Cu $ atom (atomic number 29) in its ground state, is
Tetradynamous condition is found in
Some of the steps of DNA fingerprinting are given below. Identify the correct sequence from the options given : A. Electrophoresis of DNA fragments B. Hybridisation with DNA probe C. Digestion of DNA by RENs D. Autoradiography E. Blotting of DNA fragments to nitrocellulose membrane
$\sin^{2}\,\theta\, \cos^{3}\,\theta-\sin^{4}\,\theta\, \cos\,\theta$ is equal
$ \frac{sin\,60^{\circ}+i\,cos\,60^{\circ}}{cos\,15^{\circ}-i\,sin\,15^{\circ}}= $
Oxidative decarboxylation occurs during the formation of
Out of the following statements with respect to the postulates of Werner?? theory, (1) the central metal atom of coordination compounds shows two types of valencies (2) the primary valencies are normally non ionisable and are satisfied by neutral molecules or negative ions (3) the secondary valencies are ionisable and are satisfied by negative ions only (4) the ions/groups bound by the secondary linkages to the metal have characteristic spatial arrangements corresponding to different coordination numbers The incorrect statements are
Oil used as frothing agent in froth floatation process is
Milk is an emulsion in which:
Micelles are:
$\log_3\,2, \log_6\,2, \log_{12}\,2$ are in
Light wave enters from medium $1$ to medium $2$. Its velocity in $2^{nd}$ medium is double from $1^{st}$. For total internal reflection the angle of incidence must be greater than
If the sequence of bases in the coding strand of a double stranded $DNA$ is $5'\, GTTCGAGTC-3'$, the sequence of bases in its transcript will be
If the linear momentum is increased by $50\%$, then kinetic energy will increase by
If an atom crystallises in bcc lattice with r = 4 $?? then the edge length will be
Consider the system shown in figure. The pulley and the string are light and all the surfaces are frictionless. The tension in the string is (take g = 10 m s)
Best reagent for the conversion of $AgNO_3$ to Ag is
XX-XY type of sex determination mechanism is an example of male heterogamety. In birds, male heterogamety is seen as males produce two different types of gametes.
When acetamide reacts with $NaOH$ and $Br_2$, methyl amine is formed. The reaction occurs through intermediate formation of isocyanate.
When an object is placed between two plane parallel mirrors, then all the images found are of equal intensity. In case of plane parallel mirrors, only two images are possible.
Value of radius of gyration of a uniform rigid body depends on axis of rotation. Radius of gyration is root mean square distance of particles of the body from the axis of rotation.
Staggered conformation of ethane is $12.5\, kJ\, mol^{-1}$ more stable than the eclipsed conformation. The two conformations of ethane cannot be separated at room temperature.
In opposite phyllotaxy two leaves are borne on the opposite sides of a single node. Opposite phyllotaxy is seen in China rose and Oleander.
IgM is a type of immunoglobulin which cannot cross the placenta. IgM is pentamer immunoglobulin, joined by J-chain.
Gap junctions perform cementing function to keep the neighbouring cells together. Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.