List of practice Questions

When a metallic surface is illuminated with radiation of wavelength $\lambda$ , the stopping potential is V. If the same surface is illuminated with radiation of wavelength $2 \lambda$, the stopping potential is $\frac{V}{4}$ . The threshold wavelength for the metallic surface is :

Which of the following statement about hydrogen is incorrect ?

Which of the following statements is not correct?

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion $(Ca^{2+})$ and fluoride ion $(F^-)$ are

In male cockroaches, sperms are stored in which part of the reproductive system ?

In which of the following molecules, all atoms are coplanar ?

Lithium has a $bcc$ structure. Its density is $530 \, kg \, m^{-3}$ and its atomic mass is $6.94 \, g \, mol^{-1}$. Calculate the edge length of a unit cell of Lithium metal. ($NA = 6.02 \times 10^{23} \, mol^{-1}$)

Which among the given molecules can exhibit tautomerism?

Which kind of therapy was given in 1990 to a four-year-old girl with adenosine deaminase [ADA] deficiency ?

Which of the following biphenyls is optically active ?

Which part of the tobacco plant is infected by Meloidogyne incognita ?

Which one of the following is the starter codon ?

Which of the following statement about hydrogen is incorrect ?

Which of the following restriction enzymes produces blunt ends ?

Which of the following is not a feature of the plasmids ?

Which of the following is a restriction endonuclease ?

Microtubules are the constituents of

Mitochondria and chloroplast are- (a) semi-autonomous organelles (b) formed by division of pre existing organelles and they contain DNA but lack protein synthesising machinery Which one of the following options is correct?

$MY$ and $NY_3$, two nearly insoluble salts, have the same $K_{SP}$ values of $6.2 \times 10^{-13}$ at room temperature. Which statement would be true in regard to $MY$ and $NY_3$ ?

Natural rubber has :

One mole of an ideal monatomic gas undergoes a process described by the equation $PV^{3}=$ constant. The heat capacity of the gas during this process is -

Oxidative phosphorylation is

Photosensitive compound in human eye is made up of -