List of practice Questions

The half life period of a first order chemical reaction is $6.93$ minutes. The time required for the completion of $99\%$ of the chemical reaction will be ($log\, 2\,=\,0.301$) :
The time taken for $10\%$ completion of a first order reaction is $20$ minutes. Then for $19\%$ completion the reaction will take
Laminaria and Fucus belong to
Sphagnum is commonly used as packing material for transshipment of living material due to its
External fertilization occurs in majority of
Vascular plants which produce seeds but not fruits belong to the group
Which of the following classification is based on some morphological characters?
Young leaves of Cycas show
Which of the following plant kingdom is called 'amphibians'?
Both chlorophyll a and b are present in
Calyptra develops from
A fern differs from a moss in having
Female cone of Pinus is a
Prothallus of the fern produces
In Funaria capsule dispersal of spores takes place through
Fern spores are usually
Which one of the following classes is included under gymnosperms ?
Which of the following statements about Spirogyra is correct?
Natural system of classification was given by
Phylogenetic system of classification is based on
Given that the abundant of isotope $^{54}Fe$, $^{56}Fe$ and $^{57}Fe$ are $5\%$, $90\%$ and $5\%$ respectively, the atomic mass of $Fe$ is :
An organic compound made of $C, H$ and $N$ contains $20\%$ nitrogen. Its molecular weight is :
25 mL of 0.08 N Mohr's salt solution is oxidised by 20 mL of $K_2Cr_2O_7$ in acidic medium. The mass of Mohr's salt present in 500 cc is
What is the molarity of $H _{2} SO _{4}$ solution that has a density of $1.84\, g / cc$ at $35^{\circ} C$ and contains $98 \%$ by weight?
One atom of an element weighs $ 1.8\times 10^{-22}g$ . Its atomic mass is