List of practice Questions

$ZnO$ is white when cold and yellow when heated. It is due to the development of
What is the name of the following reaction? $ {PhCHO + (CH3CO)2O ->[Na(OAc)_2] PhCH=CHCO2H}$
What is the correct order of basicity among the following compounds ?
What is Epiblema?
Two events $A$ and $B$ will be independent if
Three point charges of $+ 2q, + 2q$ and $- 4q$ are placed at the corners $A, B$ and $C$ of an equilateral triangle $ABC$ of side $'x'$. The magnitude of the electric dipole moment of this system is
Thermodynamic properties are divided into two broad types : intensive properties and extensive properties. Which of the following is not an intensive property?
The transistor parameters, namely $ \alpha $ and $ \beta $ of a transistor are related as
The signals for parturition originate from :
The electric intensities at a point due to two point charges in the $ x - y $ plane are $3 \hat{i} -2 \hat{j} $ and $ -2\hat{i} +4\hat{j} $ The magnitude of the resultant intensity at that point is
The change in the gravitational potential energy when a body of mass $m$ is raised to a height $nR$ above the surface of the earth is (here $R$ is the radius of the earth)
Root hairs develop from the region of :
(R)-2-Iodobutane is treated with $NaI$ in acetone and allowed to stand for a long time. The product eventually formed is
Pick the correct group consisting of all genera exhibiting homospory.
Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atom in ground state is excited by monochromatic light of energy 12.1 eV. The spectral lines emitted by hydrogen according to Bohr?? theory will be
If $\log_{\sin \frac{\pi}{6}} \left\{\frac{\left|z-2\right| + 3 }{3\left|z - 2\right| - 1 }\right\}>1 $ , then
Identify the accurate explanation of mesosome. It is
Consider the following set of reactions : $ {CH3COOH ->[SOCl_2] A}$$ { ->[Benzene][Anhyd. AlCl_3] B}$$ { ->[HCN] C}$$ { ->[HOH] D}$ The structure of D would be
Calculate the overall complex dissociation equilibrium constant for the $[Cu(NH_3)_4]^{2+}$ ions, given that stability constant ($\beta$) for this complex is $2.1 \times 10^{13}$.
XX-XY type of sex determination mechanism is an example of female heterogamety and is found in Drosophila. Male heterogamety is seen in moths where males produce two different types of gamete.
Yeasts are unicellular fungi that are used in bakery and brewery industries. Potato spindle tuber disease is caused by viroids.
Two point coherent sources of light S and S are placed on a line as shown. P and Q are two points on that line. If at point P maximum intensity is observed then maximum intensity should also be observed at In the figure of assertion the distance $\left|S_{1}P-S_{2}P\right|$ is equal to distance $\left|S_{2}Q-S_{1}Q\right|$.
trans-Pent-2-ene is polar but trans- but-2-ene is non-polar. The polarity of cis-isomer is more than trans-isomer, which are either non-polar or less polar.
The number of tetrahedral voids is double the number of octahedral voids. The size of the tetrahedral voids is half of that of the octahedral void.
Restriction enzymes cut the strand of DNA to produce sticky ends. Stickiness of the ends facilitates the action of the enzyme DNA polymerase.