List of practice Questions

The following reaction is named as
A satellite is launched in a circular orbit of radius $ R $ around the earth. A second satellite is launched into an orbit of radius $ 1.01\,R $ . The period of second satellite is longer than the first one (approximately) by
The lattice energy of $NaCl$ is $788 \,kJ \, mol^{-1}$. This means that $788\, kJ$ of energy is required
The position vector of the particle is $\vec{r} (t) = a \, \cos \omega t \hat{i} + a \, \sin \, \omega t \, \hat{j}$, where $a$ and $\omega$ are real constants of suitable dimensions. The acceleration is
A rod of mass $m$ and length $l$ (is made to stand at an angle of $ {{60}^{o}} $ with the vertical. Potential energy of the rod in this position is
The hybridization of oxygen atom in $H_2O_2$ is
The electronic configuration of four elements are 1. $ [ Xe ] 6x^1$ 2. $ [ Xe ] 4 f^{ 14} \, 5d^1 \, 6s^2 $ 3. $ [ A r ] 4s^2 \, 4p^5 $ 4. $ [ A r ] 3d^7 \, 4s^2 $ Which one of the following statements about these elements is not correct?
Which of the following is used as a 'morning after pill'?
The bond lengths and bond angles in the molecules of methane, ammonia and water are given below .This variation in bond angle is a result of (i) the increasing repulsion between hydrogen atoms as the bond length decreases (ii) the number of non-bonding electron pairs in the molecule (iii) a non-bonding electron pair having a greater repulsive force than a bonding electron pair
A pure dextrorotatory monocarboxylic acid is treated with racemic mixture of an alcohol containing one chiral carbon. The ester formed will be
Bacteria which reduce nitrates in soil to nitrogen are
Which one of these is an in situ method of conservation ?
A particle is released from a height $ S $ . At certain height its kinetic energy is three times its potential energy. The height and speed of the particle at that instant are respectively
If one strand of DNA has the sequence ATGCTTGA, the sequence in the complementary strand would be
Which of the following exists as Zwitter ion?
When a beam of light is passed through a colloidal solution it:
Chemical bond implies
Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent because
Drupes are called stony fruits because they have
Identify in order, the plants showing alternate, opposite and whorled phyllotaxy
Neoteny refers to
A list of animals is given below. Identify the animals with open circulatory system and choose the correct answer. (a) Ascidia (b) Cockroach (c) Earthworm (d) Prawn (e) Silverfish (f) Snail (g) Squid.
"Triploblastic, unsegmented, acoelomate exhibiting bilateral symmetry and reproducing both asexually and sexually with parasitic forms". The above description is characteristic of phylum
$B(OH)_3$ is a
Of the following the one which is example of buffer system in blood is