List of practice Questions

Downs syndrome is caused by an extra copy of chromosome number $21$. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?
An action potential in the nerve fibre is produced when positive and negative charges on the outside and the inside of the axon membrane are reversed, because
Patients suffering from cholera are given a saline drip because
Choose the correct sequence of stages of growth curve for bacetria
An artificial pace-maker is implanted subcutaneously and connected to the heart in patients
$E$. coli about to replicate was placed in a medium containing radioactive thynidine for five minutes. Then it was made to replicate in a normal medium. Which of the following observation will be correct?
Plasmids are suitable vectors for gene cloning because
In a given plant, red colour $(R)$ of fruits is dominant over white fruit $(r)$ : and tallness $(T)$ is dominant over dwarfness (t). If a plant with genotype $RRTt$ is crossed with a plant of genotype $rrtt$, what will be the percentage of tall plants with red fruits in the next generation?
The greatest biomass of autotrophs in the world's oceans is that of
In most of the fungi, the food material is stored in the form of
Anticodon is present on
A person is having problem with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly ?
Lysosomes are the reservoirs (store houses) of
An electron and proton enter a magnetic Held perpendicularly. Both have same kinetic energy. Which of the following is true?
An atom has electronic configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}$, you will place it in
A reaction occurs spontaneously if
An animal without anus is
$CH _{3} OC _{2} H _{5}$ and $\left( CH _{3}\right)_{3} C - OCH _{3}$ are treated with hydroiodic acid. The fragments after reactions obtained are
One mole of methanol when burnt in $O _{2}$, gives out $723\, kJ\, mol ^{-1}$ heat. If one mole of $O _{2}$ is used, what will be the amount of heat evolved?
The species having tetrahedral shape is
Which of the following does not exist as a Zwitter ion?
The hydrocarbon which does decolourise alkaline $KMnO_{4}$ solution and also does not give any precipitate with ammoniacal silver nitrate is
Plexiglass is a commercial name of
The temperature dependence of rate constant $(k)$ of a chemical reaction is written in terms of Arrhenius equation $k=A e^{-E_{\alpha} / R T}$. Activation energy $\left(E_{a}\right)$ of the reaction can be calculated by ploting
Which one of the following is the true covalent oxide of iodine?