List of practice Questions

The wavelength of the first line of Balmer series is $6563\,??. The Rydberg constant for hydrogen is about

Bulk modulus of water is $ 2\times 10^{9}N/m^{2}$ . The change in pressure required to increase the density of water by $0.1\%$ is

A body starts to fall freely under gravity. The distances covered by it in first, second and third seconds are in ratio

Boron cannot form which one of the following anions?

Blue revolution is related with

Blood cholesterol lowering agents statins are produced by

Auxanometer is used to measure

At two points P and Q on a screen in Young's double slit experiment, waves from slits $S_1$ and $S_2$ have a path difference of 0 and $\frac{\lambda}{4}$ respectively. The ratio of intensities at P and Q will be :

TMV is a rod-shaped virus. It is made up of protein coat and RNA.

The resistance of an ideal voltmeter should be infinite. The lower resistance of voltmeters gives a reading lower than the actual potential difference across the terminals.

Sporozoites of malarial parasite enter in the human body due to biting of freshly born female Anopheles mosquito, whose mother was a carrier of malarial parasite.. Male and female gametocytes of malarial parasites are formed in the human intestine.

Sinus venosus is a thin-walled sac with little muscular tissue in primitive heart. It receives venous blood through the hepatic veins.

Phenoxide ion on treatment with active alkyl halide (e.g., $CH _{2}= CH - CH _{2} Cl$ ) gives two products viz. $O$-substituted and $C$-substituted. Phenoxide ion is an ambident nucleophile.

: $pH $ of neutral solution is always $7$. : $pH$ of a solution does not depend upon temperature.

: $p$-dichlorobenzene is less soluble in organic solvents than the corresponding $o$-isomer. : $o$-dichlorobenzene is polar while $p$-dichlorobenzene is not

Now-a-days amniocentesis is banned. Amniocentesis gives the information of any abnormality in the foetus and many other complications regarding pregnancy can be detected.

$ NaCl $ is less soluble in heavy water than in ordinary water. Dielectric constant of ordinary water is more than that of heavy water.

$C_{p}$ can be less than $C_{V}$. $C_{p} C_{V}=R$ is valid only for ideal gases.

Magnification of a convex mirror is always positive, but that of a concave mirror may be both positive or negative. It depends on the sign convention chosen.

$KE$ is conserved at every instant of elastic collision. No deformation of matter occurs in elastic collision.

In the transmission of long distance radio signals, short wave band is used. In shorter wavelength, attenuation is very less.

Helium is used in diving apparatus. Solubility of helium is less in blood.

$H_2S$ is less acidic than $H_2$ Te Te has larger radius than S.

Fructose is a reducing sugar. It has a ketonic group.

DNA is present is