List of practice Questions

Two perfectly black spheres $A$ and $B$ having radii $8\,cm$ and $2\,cm$ are maintained at temperatures $127^{\circ}C$ and $527^{\circ}C$ respectively. The ratio of the energy radiated by $A$ to that by $B$ is
Persons who are colourblind cannot distinguish
In frequency modulation
Choose the correct sequence in the hierarchy of taxonomic categories in desending order
Which of the following is/are true ? I. Biowar - Biowar is the use of biological weapons against humans and or their crops and animals. II. Bioethics - Bioethics is the unauthorised use of bioresources and traditional knowledge related to bioresources for commercial benefi ts. III. Biopatent - Exploitation of bioresources of other nations without proper authorization
Which one of the following is correctly paired ?
Which one of the following is not a characteristic feature of the subphylum Vertebrata ?
The solution set of the in equation $ \frac{x+11}{x-3}>0 $ is
The following set of reactions are used in refining zirconium. $Zr (impure) + 2I_2$ ${->[523K]}$ $ZrI_4$ ${->[1800K]}$ Zr (pure) +$2I_2$ This method is known as
Which of the following bases is not present in $DNA$ ?
The covalent bond length is the shortest in which one of the following bonds?
The linkage between the two monosaccharide units in lactose is
The set of all real $ x $ satisfying the in equal $ \frac{3-|x|}{4-|x|}\ge 0 $
If $\left(1+x+x^{2}\right)^{n} =1+a_{1}x+a_{2}x^{2} +\cdots+a_{2n}x^{2n}$, $2a_{1} -3a_{2} +\cdots-\left(2n+1\right)a_{2n}$ is equal to
The average oxidation state of sulphur in $Na_2S_4O_6$ is
Choose the disproportionation reaction among the following redox reactions
The magnetic flux linked with a coil of $N$ turns of area of cross section $A$ held with its plane parallel to the field $B$ is
Water is heated from $0^\circ\,C$ to $10\, ^\circ\,C$. then its volume
When (-)-2-methylbutan-1-ol is heated with concentrated hydrochloric acid, (+) 1-chloro-2-methylbutane is obtained. The reaction is an example of
Which one of the following reagent will convert acetamide to ethanamine?
In the eclipsed conformation of ethane, the dihedral angle between the hydrogen atoms of adjacent methyl groups is
Which of the following three organelles are involved in photorespiration ?
In the monocotyledonous seeds the endosperm is separated from the embryo by a distinct layer of
Match list I with list II and select the correct option
Which of the following promotes softening of fruits ?