List of practice Questions

An insect bite may result in inflammation of that spot. This is triggered by the alarm chemicals such as
Which of the following chemical reactions depicts the oxidizing behaviour of $H_{2} SO_{4}$ ?
How many moles of magnesium phosphate, $Mg_{3} \left(po_{4}\right)_{2}$ will contain 0.25 mole of oxygen atoms ?
HBr reacts with $CH_{2} =CH-OCH_{3}$ under anhydrous conditions at room temperature to give:
The organic chloro compound, which shows complete sterochemical inversion during a $ {S_{N^2}}$ reaction, is
Alternating current cannot be measured by $D.C.$ ammeter because
Which group of animals exhibits bilateral and radial symmetry 'in larval and adult stages respectively?
Activity of a radioactive sample decreases to $ (1/3)^{rd} $ of its original value in 3 days. Then, 1 in 9 days its activity will become
$0.01 M$ solution of $KCl$ and $BaCl _{2}$ are prepared in water. The freezing points of $KCl$ is found to be $-2{ }^{\circ} C$. What is the freezing point of $BaCl _{2}$ to be completely ionised?
A unit cell of sodium chloride has four formula units. The edge length of the unit cell is $0.0564\, nm$. What is the density of sodium chloride?
Non-oxide ceramics can be
A transverse wave propagating along x-axis is represented by $ y(x,t)=8.0\sin \left( 05\pi x-4\pi t-\frac{\pi }{4} \right) $ where $x$ is in metre and $t$ is in second. The speed of the wave is
A car of mass m moves in a horizontal circular path of radius $r\,m$. At an instant its speed is v $ ms^{ - 1 } $ and is increasing at a rate of a $ ms^{ - 2}$ . Then the acceleration of the car is
An $\alpha -$ particle of energy 5 MeV is scattered through $180 ^\circ $ by a fixed uranium nucleus. The distance of the closest approach is of the order of
A spring of spring constant $5 \times 10^3 Nm^{-1}$ is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is
Which one of the following is most reactive towards electrophilic attack ?
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
When $o$- or $ p- $ phenolsulphonic acid is treated with bromine water, the product formed is
Vascular tissues in flowering plants develop from
Vacuole in a plant cell
Keeping in view the 'fluid mosaic model' for the structure of cell membrane, which one of the following statement is correct with respect to the movements of lipids and proteins from one lipid monolayer to the other (described as flipflop movement)?
In Williamson's synthesis, ethoxyethane is prepared by
In which of the following compounds $ -OH $ group is least reactive?
In germinating seeds fatty acids are degraded exclusively in the
If $ N{{a}^{+}} $ ion is larger than $ M{{g}^{2+}} $ ion and $ {{S}^{2-}} $ ion is larger than $Cl^-$ ion, which of the following will be stable soluble in water?