List of practice Questions

Match List-I with List-II for the equations and select the correct option.
Among the following, which one has the highest cation to anion size ratio?
Which of the following species is not electrophilic in nature?
Match List-I (Substances) with List-II (Processes employed in the manufacture of the substances) and select the correct option.
The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?
Consider the reactions
The mechanisms of reactions (i) and (ii) are respectively
The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction corresponding to the formation of the slag.
Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is
The following reaction is a reversible reaction that exhibits high temperature behaviour:
A transistor is operated in common emitter configuration at \( V_C = 2V \) such that a change in the base current from 100 μA to 300 μA produces a change in the collector current from 10 mA to 20 mA. The current gain is
A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron
Charge \( q \) is uniformly spread on a thin ring of radius \( R \). The ring rotates about its axis with a uniform frequency \( f \). The magnitude of magnetic induction at the centre of the ring is
A galvanometer of resistance \( G \) is shunted by a resistance \( S \, \Omega \). To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is
Three charges, each \( +q \), are placed at the corners of an isosceles triangle ABC of sides BC and AC, 2a. D and E are the mid-points of BC and CA. The work done in taking a charge \( Q \) from D to E is
A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will happen to the volume of the bubble?
Match List-I with List-II for the compositions of substances and select the correct answer using the codes given below the lists.
If a triode value amplification factor is 20 and plate resistance is \( 10 \, \text{k}\Omega \), then its mutual conductance is
The output wave form of full-wave rectifier is
Calculate the energy released when three \( \alpha \)-particles combined to form a \( \text{C}^{12} \) nucleus, the mass defect is
In the figure shown, the magnetic field induction as the point \( O \) will be
In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is
The current in a coil varies with time as shown in the figure. The variation of induced emf with time would be
In photoelectric emission, the current varies with time as shown. The variation of induced emf with time would be
In hydrogen atom, an electron is revolving in the orbit of radius 0.53 Å with \( 6.6 \times 10^{15} \) radiations. Magnetic field produced at the centre of the orbit is