List of practice Questions

The reaction by which benzaldehyde is converted in benzyl alcohol, is
The ratio of intensities between two coherent sound sources is $4 : 1$. The difference of loudness in decibels between maximum and minimum intensities, when they interfere in space, is
The prokaryotic cells are characterised by
The $pH$ of the digestive juices within the human small intestine is between $7.5$ and $8.5$. This environment is slightly
The path difference between the two waves $y_{1}=a_{1} \sin \left(\omega t-\frac{2 \pi x}{\lambda}\right)$ and $y_{2}=a_{2} \cos \left(\omega t-\frac{2 \pi x}{\lambda}+\phi\right)$ is
The outermost limiting layer of mycoplasma is made up of
The number of $3 \times 3$ non-singular matrices with four entries as $1$ and all other entries as $0$ is
A metallic solid sphere is rotating about its diameter as axes of rotation. If the temperature is increased by 200?C, the percentage increase in its moment of inertia is (Coefficient of linear expansion of the metal $ ={{10}^{-5}}{{/}^{o}}C $ )
In planetary motion the areal velocity of position vector of a planet depends on angular velocity ( $ \omega $ ) and distance of the planet from the sun (r). If so the correct relation for areal velocity is
Certain neutron stars are believed to be rotating at about 1 rev /s. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be
The moment of inertia of a thin spherical shell of mass M and radius R about a diameter is $ \frac{2}{3} $ MR 2Its radius of gyration K about a tangent will be
The major product obtained on interaction of phenol with sodium hydroxide and carbondioxide is
The $M - O - M$ bond angles in $M_2O$ (where $M$ is halogen) is in the order
The IUPAC name of $ K[Ag(CN)_{2}]$ is
The impedance of a $ RC $ circuit is $ {{Z}_{1}} $ for frequency $ f $ and $ {{Z}_{2}} $ for frequency $ 2f $ . Then, $ {{Z}_{1}}/{{Z}_{2}} $ is
The floral formula ? ? K C A G is that of
The female genital pore of Pheretima posthuma located upon the segment
The energy absorbed by each molecule $(A_2)$ of a substance is $4.4\times 10^{-19} J$ and bond energy per molecule is $4.0\times 10^{-19} J$The kinetic energy of the molecule per atom will be
The electrophile involved in the sulphonation of Benzene is
The dimensions of specific resistance are
The correct order of stability of the superoxides is
Stoma opens, when
Bryophytes resemble algae in the following aspects
What is/are true about heart wood?
An animal,-which has both exoskeletal and endoskeletal structures is a