List of practice Questions

The rate at which a substance reacts depends on its
Two boys are standing at the ends A and B of a ground where AB = a. The boy at B starts running in a direction perpendicular to AB with velocity $v_1$. The boy at A starts running simultaneously with velocity v and catches the other in a time t, where t is
The correct sequence of increasing covalent character is represented by
Which of the following would have a permanent dipole moment?
A unit vector perpendicular to the plane containing the vectors $\hat {i}-\hat {j}+\hat{k} $ and $ -\hat{i}+\hat {j}+\hat{k}$ is
The contrapositive of the inverse of $p \to \sim q$ is
If a liquid does not wet glass, its angle of contact is
For a constant hydraulic stress on an object, the fractional change in the object's volume $(\Delta V / V)$ and its bulk modulus $(B)$ are related as :
A bomb of mass 30kg at rest explodes into two pieces of masses 18kg and 12kg. The velocity of 18kg mass is 6ms-1. The kinetic energy of the other mass is
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