List of practice Questions

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
Which one of the following forms micelles in aqueous solution above certain concentration?
A particle describes a horizontal circle in a conical funnel whose inner surface is smooth with speed of $ 0.5\,m/s $ . What is the height of the plane of circle from vertex of the funnel?
$ 2\,g $ of water condenses when passed through $ 40\,g $ of water initially at $ 25^{\circ}C $ . The- condensation of steam raises the temperature of water to $ 54.3^{\circ}C $ . What is the latent heat of steam?
The spectral energy distribution of a star is maximum at twice temperature as that of sun. The total energy radiated by star is
The most biodiversity rich zone in India
Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution ?
The matrix [5103−2−46−1−2b]is a singular matrix, if b equals
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
For the reaction $N_{2(s)}+O_{2(s)} \rightleftharpoons 2 N O_{(g)}$, the value of $K_{c}$ at $800^{\circ} C$ is $0.1 .$ When the equilibrium concentrations of both the reactants is $0.5 \,mol$, what is the value of $K_{P}$ at the same temperature?
A micro-organism, when viewed under a compound microscope with an objective lens of 40 X and an eye piece of 10 X magnification measured 4000 � in length. The same microorganism when observed under a dissection microscope with a lens of 10 X magnification, would measure........