List of practice Questions

In the operon system, the repressor protein can bind only with the

If the angles of a triangle are in the ratio $3 : 4 : 5$, then the sides are in the ratio

Which of the following birth control measures can be considered as the safest ?

$ Al_2O_3$ can be converted into anhydrous $AlCl_3$ by heating

In the homeostatic control of blood sugar level, which organs function respectively as modulator and effector ?

Passive absorption of water by root system is the result of

Two pea plants were subjected cross pollination. Of the 183 plants produced in the next generation, 94 plants were found to be tall and 89 plants were found to be dwarf. The genotypes of the two parental plants are likely to be

In the synthesis of which of the following, the DNA molecule is not directly involved ?

The chemical nature of gibberellin is that they are

The following diagrams show the types of secondary thickenings in the xylem vessels. Identify the types labelled from A to F. Choose the correct option from those given.

What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?

Inductive effect involves

If $\lambda_{1}$ and $\lambda_{2}$ are the wavelengths of the first members of the Lyman and Paschen series respectively, then $\lambda_{1}: \lambda_{2}$ is

The increasing order of the rate of HCN addition to compounds A-D is : (A) $HCHO$ (B) $CH_3COCH_3$ (C) $PhCOCH_3$ (D) $PhCOPh$

The hydrogen ion concentration of a $ 10^{-8}M HCl $ aqueous solution at 298 K $ ( K_w = 10^{-14} ) $ is :-

The appearance of colour in solid alkali metal halides is generally due to :

The following is a diagram of the just spawned frog's egg, with the parts labelled from A to E. Identify the parts and choose the correct option from those given below

Insulin regulates the metabolism of

Which of the following has the highest bond order ?

Maximum number of hydrogen bonding is in :

The enthalpy and entropy change for the reaction : $ {Br2(\ell) + Cl2(g) -> 2BrCl(g)}$ are $30 \,kJmol^{-1}$ and $105\,JK^{-1} mol^{-1}$ respectively. The temperature at which the reaction will be in equilibrium is :

Two circular coils 1 and 2 are made from the same wire but the radius of the $1^{st} $ coil is twice that of the $ 2^{nd} $coil. What potential difference in volts should be applied across them so that the magnetic field at their centres is the same-

Which of the following species has a linear shape?

In the group $G = \{1,5,7,11\}$ under multiplication modulo $12$, the solution of $ 7^{-1} \; \otimes_{12} (x \otimes_{12} 11) = 5$ is $x$ =

The value of $\displaystyle\lim_{x \to 0} \frac {5^x-5^{-x}}{2x}=$ is :