List of practice Questions

Average density of the earth :
An important step in the manufacture of pulp for paper industry from the woody tissues of plants is the :
A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5sons).Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease?
In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype
A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by:
Genes for cytoplasmic male sterility in plants are generally located in
More than 70% of world's freshwater is contained in
A buffer solution has equal volumes of $0.2M \, NH_4OH$ and $0.02\, M \, NH_4 Cl$. The $p^{kb}$ of the base is $5$. The $pH$ is
Alum is a water purifier because it
Ethyl chloride on heating with $AgCN$, forms a compound $'X'$ . The functional isomer of $'X'$ is -
Which of the following pairs of elements cannot form an alloy ?
If the potential difference across the internal resistance $r_1$ is equal to the emf $E$ of the battery, then
Which compound is zero valent metal complex ?
Which of these does not influence the rate of reaction?
Four metal conductors having different shapes a) a sphere b) cylindrical c) pear d) Lightening conductor are mounted on insulating stands and charged. The one which is best suited to retain the charge for a longer time is
By using only two resistance coils-singly, in series, or in Parallel-one should be able to obtain resistances of $3, 4, 12$ and $16$ ohms. The separate resistances of the coil are
The magnitude of $I$ in ampere unit is
The circular motion of a particle with constant speed is:
Which of the following pairs is correctly matched ?
An acromion process is characteristically found in the :
$9th$ pair of cranial nerve in frog is :
Chlorophyll in chloroplasts is located in
Centromere is required for
The main organelle involved in modification and routing of newly synthesized proteins to their destinations is:
A heavy brass sphere is hung from a weightless inelastic spring and as a simple pendulum its time period of oscillation is T. When the sphere is immersed in a non-viscous liquid of density 1/10 that of brass, it will act as a simple pendulum of period :