List of practice Questions

Which of the following gives a white precipitate with alcoholic silver nitrate?
A number of capacitors labelled as $8 \, \mu F, 250 \, V$ are given. Minimum number of capacitors needed to get an arrangement equivalent to $10 \, \mu F, 1000 \, V$ is
An electron projected in a perpendicular uniform magnetic field of $3 \times 10^{-3} T, $ moves in a circle of radius 4 mm. The linear momentum of electron $(in \, kg-ms^{-1}) $ is
At $ 25^\circ $, the dissociation constant of a base, BOH is $ 1.0 \times 10^{-12} $. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be
In any fission process the ratio $\frac{mass \, of \, fission \, products}{mass \, of \, parent \, nucleus} is$
Which of the following pairs is correctly matched?
An ideal gas heat engine operates in Carnot cycle between 227°C and 127°C. It absorbs 6 x 104 cal of heat at higher temperature. Amount of heat converted to work is:
The net pressure gradient that causes the fluid to filter out of the glomeruli into the capsule is:
Carbohydrates most abundant biomolecules on earth, are produced by :
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these:
Two batteries, one of emf 18 volts and internal resistance $2\, \Omega$ and the other of emf 12 volts and internal resistance $1\, \Omega$ are connected as shown. The voltmeter V will record a reading of
For a first order reaction, $A \longrightarrow B$, the reaction rate at reactant concentration of $0.01\, M$ is found to be $2.0 \times 10^{-5} \, mol \, \, L^{-1} s^{-1}$. The half-life period of the reaction is
Telomerase is an enzyme which is a:
Which of the following circular rods,(given radius r and length l)each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
E.coli cells with a mutated Z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because :
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be
For retting of jute the fermenting microbe used is
Electrolytic reduction of nitrobenzene weakly acidic medium gives:
A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that $\vec{B}$ is in plane of the coil. If due to a current i in the triangle a torque $ \tau $ acts on it, the side l of the triangle is
A force $F$ acting on an object varies with distance $x$ as shown in the figure. The force is in $N$ and $x$ in $m$. The work done by the force in moving the obiect from $x=0$ to $x = 6 \,m$ is
In any fission process the ratio (mass of fission products/mass of parent nucleus) is :
Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness.
AIDS is caused by HIV that principally infects:
In a p-n junction photo cell, the value of the photo-electromotive force produced by monochromatic light is proportional to
G-6-P dehydrogenase deficiency is associated with haemolysis of