List of practice Questions

"Omnis-cellula-e-cellula" was given by

Number of bones in skull is

National botanical garden and national botanical institute are located at

Which of the following disaccharide has different type of linkage?

$ NaH $ contains how many covalent bonds?

Which of the following process will give soap?

In the reaction $CH _{3} CH _{2} COONH _{4} {->[{ P _{2} O _{5}}]} A {->[{ H ^{+} / H _{2} O }]}B A$ and $B$ are

Number of a and $n$ bonds in $C _{6} H _{5} COOH$ are

Mulching helps in

Mottled chlorosis on the leaves occurs due to the deficiency of

The amount of heat released when $20\, mL$ of $0.5 \,M \,NaOH$ is mixed with $100 \,mL$ of $0.1 \,M \,HCl$ is $x \,kJ$. The heat of neutralisation (in $kJ \,mol ^{-1}$ ) is

When phosphorus reacts with caustic soda, the products are $PH _{3}$ and $NaH _{2} PO _{2}$. This reaction is an example of

For a gaseous reversible reaction, which of the following expressions is correct?

$Mg^{2+}$ is isoelectronic with

Magnetic field produced due to a current carrying conductor is independent of

In maize, hybrid vigour is exploited by

In a semiconductor electron concentration is $7 \times 10^{13} \,cm ^{-3}$ and hole concentration is $5 \times 10^{12} \,cm ^{-3}$. Then the semiconductor is

Shape of $ XeF_4$ molecule is

A brown ring appears in the test for

At the high pressure, Langmuir adsorption isotherm takes the form

Sound waves cannot travel in vacuum but light can travel in vacuum. Sound waves are longitudinal waves and they cannot be polarised but electromagnetic waves are transverse and they can be polarised.

: $7$-celled, $8$ nucleate and monosporic embryosac is called Polygonum type of embryo sac. : It was discovered by Hofmeister for the first time in Polygonum.

Top - shaped multiciliate male gametes and the mature seed which bears only one embryo with two cotyledons, are characteristic features of

More than $70\%$ of worlds freshwater is contained in

Three crops that contribute maximum to global food grain production are