List of practice Questions

Phosphodiester linkage that joins nucleotides together is present between which carbons of pentose sugar?
Which of the following is used in liquid detergents?
Given below are the two statements regarding chlorobenzene
Statement I: Chlorobenzene is less reactive than benzene towards electrophilic substitution due to the -I effect of chlorine.
Statement II: Because of the -I effect of chlorine, it is a meta directing group.
Which of the following sequence of reagents convert benzaldehyde to 4-chlorotoluene?

Phenatole can be prepared from which of the following reactants?

Identify 'Z' in the following sequence of reactions: 

In the following reaction sequence, what are X and Y respectively? 

 

If \( M_1 \) is the mean deviation from the mean of the discrete data \( 44, 5, 27, 20, 8, 54, 9, 14, 35 \) and \( M_2 \) is the mean deviation from the median of the same data, then \( M_1 - M_2 = \):
Which of the following is correct statement?
An alkene ‘X’ (C\(_4\)H\(_8\)) does not exhibit cis/trans isomerism. Reaction of ‘X’ with Br\(_2\)/CCL\(_4\), followed by reaction with reagent ‘Y’ gave ‘Z’ (C\(_6\)H\(_6\)). What are ‘Y’ and ‘Z’ respectively?
In Ostwald process of manufacture of nitric acid, 12 moles of NH3 was completely oxidized in air by a catalyst at 500 K and 9 bar. The resultant NO(g) was completely oxidized to NO2(g) and dissolved in water to form nitric acid and NO(g). What is the weight (in g) of nitric acid formed?
Observe the following two statements: I. For an isolated system, \( \Delta U = 0 \); \( q = 0 \) II. For a closed system, \( \Delta U = 0 \); \( q \neq 0 \) The correct answer is
Two statements are given below: I. Sodium hexametaphosphate is used in calgon method for removal of permanent hardness of water II. Lithium forms interstitial hydrides Identify the correct answer
The correct order of reducing power of alkali metals in aqueous solution is
The power gain of a transistor operating in common emitter configuration is 32,000. If the input and output resistances of the circuit are 1200 \( \Omega \) and 6000 \( \Omega \) respectively, then the current gain is:
Electromagnetic radiation has electric and magnetic field components. These two components:
The first ionization enthalpies of the elements X, Y, Z of the second period are 899, 1402, 520 kJ/mol respectively. X, Y, Z respectively are:
The quality factor of a series LCR resonant circuit is 75. If the resistance is decreased by 50\% and the inductance is increased by 100\%, then the quality factor of the circuit is:
Two photons of energies 2.5 eV and 5.5 eV incident on a metal surface of work function 1.5 eV. The ratio of the maximum speeds of the photoelectrons emitted from the metal surface is:
In a nuclear reactor of efficiency 25\%, the number of fissions taking place per second is \( 5 \times 10^{13} \). If 200 MeV energy is released per fission, then the output power of the reactor is:
A current \( i \) flows through a circular loop of radius \( R \). The ratio of the magnetic field produced at its centre to the field produced at a point at a distance \( \frac{R}{\sqrt{3}} \) from its centre on its axis is:
Two particles of charges in the ratio \( 1:2 \) and masses in the ratio \( 2:3 \) moving along a straight line enter a uniform magnetic field at right angles to the direction of the field. If the radii of the circular paths of the particles in the magnetic field are in the ratio \( 3:4 \), then the ratio of the initial linear momenta of the two particles is:
Magnetic field on the axis of a short bar magnet of magnetic moment \( M \), at a distance \( x \) from its centre is:
The self-induced emf of a coil is 36 V. If the current in the coil is changed from 12 A to 24 A in one second, then the change in the energy stored in the coil is:
If the tension applied to a string is decreased by 36\%, then the fundamental frequency of the transverse waves of the string is: