List of practice Questions

The barrier potential of a $p-n$ junction depends on (1) type of semiconductor material (2) amount of doping (3) temperature Which one of the following is correct?
For the reaction, 3A + 2B $\to$ C + D, the differential rate law can be written as :
$2.76\, g$ of silver carbonate on being strongly heated yields a residue weighing
Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human beings?
The hormone releasing IUD is
Geitonogamy involves
On heating water, bubbles being formed at the bottom of the vessel detatch and rise. Take the bubbles to be spheres of radius $R$ and making a circular contact of radius r with the bottom of the vessel. If $r << R$, and the surface tension of water is T, value of r just before bubbles detatch is (density of water is $\rho_{w}$ )
The ratio of the accelerations for a solid sphere (mass m and radius R) rolling down an incline of angle $ \theta $ without slipping and slipping down the incline without rolling is
The reaction of aqueous $KMnO_4$ with $ H_2O_2 $ in acidic conditions gives
The correct order of bond dissociation energy among $N_2, O_2, O_2^-$ is shown in which of the following arrangements ?
The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is
Steel ruptures when a shear of $ 3.5 \times 10^8 \,Nm^{-2}$ is applied. The force needed to punch a $1\, cm$ diameter hole in a steel sheet $0.3\, cm$ thick is nearly :
From the following combinations of physical constants (expressed through their usual symbols) the only combination, that would have the same value in different systems of units, is :
An air bubble of radius $0.1\, cm$ is in a liquid having surface tension $0.06\, N/m$ and density $10^3\, kg/m^3$. The pressure inside the bubble is 1100 $Nm^{-2}$ greater than the atmospheric pressure. At what depth is the bubble below the surface of the liquid ? $(g = 9.8 \,ms^{-2})$
The gap between the plates of a parallel plate capacitor of area A and distance between plates $d$, is filled with a dielectric whose permittivity varies linearly from $\epsilon_{1}$ at one plate to $\epsilon_{2}$ at the other. The capacitance of capacitor is :
A bob of mass m attached to an inextensible string of length l is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed $\omega \,rad/s$ about the vertical support. About the point of suspension
Reason of lanthanoid contraction is
Three rods of copper , brass and steel are welded together to form a Y-shaped structure .Area of cross -section of each rod is $4cm^2$.End of copper rod is maintained at $100^{\circ}C$ whereas ends of brass and steel are kept at $0^{\circ C}$ Lengths of the copper, brass and steel rods are 46,13 and 12 cm respectively The rods are thermally insulated from surroundings except at ends.Thermal conductivities of copper , brass and steel are 092 , 0.26 and 0.12 in CGS units , respectively .Rate of heat flow throught cooper rod is
There is a circular tube in a vertical plane. Two liquids which do not mix and of densities $d_1$ and $d_2$ are filled in the tube. Each liquid subtends $90^\circ$ angle at centre. Radius joining their interface makes an angle a with vertical. Ratio $\frac{d_{1}}{d_{2}}$ is :
The octahedral complex of a metal ion $M^{3+} $ with four monodentate ligands $L_1,L_2,L_3 \, and \, L_4 $ absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is
HCl converts pepsinogen into active enzyme pepsin. Pepsin converts protein into proteoses and peptones.
In a monoclinic unit cell, the relation of sides and angles are respectively :
A human female with Turner's syndrome
Among the following complexes, the one which shows zero crystal field stabilisation energy (CFSE) is
Which of the following series correctly represents relations between the elements from X to Y?
\(X\to Y\)