List of practice Questions

The plane face of a plano-convex lens of focal length $20\, cm$ is silvered. What type of mirror will it become and of what focal length $ f $ ?
The percentage of soil volume occupied by pore space is called porosity of soil. It is minimum in:
The number of ether isomers possible for $C_{4}H_{10}O$ are:
The moment of inertia of a rod about an axis through its centre and perpendicular to it is $\frac{1}{12} ML ^{2}$ (where $M$ is the mass and $L$, the length of the rod). The rod is bent in the middle so that the two halves make an angle of $60^{\circ}$. The moment of inertia of the bent rod about the same axis would be :
The means of energy transfer in vacuum is:
The magnitude of any physical quantity
The lightest particle is:
The islets of Langerhans are found in
The integument of the frog is always kept moist because:
The increasing order of stability of the following free radicals is:
The incorrect statement among the following is
The hybrid state of sulphur in SO$_3$ molecule is
The general molecular formula, which represents the homologous series of alkanols is :
The exchange of chromosomal parts between non-homologous chromosomes is known as:
The energy gaps $(E_g)$ between valence band and conduction band for diamond, silicon and germanium are in the order
The de-Broglie wavelength of an electron, $\alpha$-patiicle and a proton all having the same kinetic energy is respectively given as $ \lambda_e, \, \lambda_\alpha $ and $ \lambda_p $. Then which of the following is not true?
The crystal of diamond shines due to
The correct order of increasing acid strength of the compounds :
The coefficient of apparent expansion of a liquid when determined using two different vessels A and B are $\gamma_1$ and $\gamma_2$ respectively. If the coefficient of lenses expansion of vessel A is $\alpha$. The coefficient of lenses expansion of the vessel B is
The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit ?
The circuit given below represents which of logic operations?
The amount of living matter present in an ecosystem at a given time is called:
Specific rotation of sugar solution is $0.5 \, deg \, m^{2} \, kg^{-1}. \,200 kgm^{-3}$ of impure sugar solution is taken in a sample polarimeter tube of length $20\, cm$ and optical rotation is found to be $19^\circ$. The percentage of purity of sugar is :
Solubility product of $ BaCl_{2}$ is $ 4\times 10^{-9}$ . Its solubility would be:
Solubility of iodine in water may be increased by adding: