List of practice Questions

Which of the following hydrogen bonds are strongest in vapour phase?
The rate constant for forward reaction and backward reaction of hydrolysis of ester are \( 1.1 \times 10^{-2} \) and \( 1.5 \times 10^{-3} \) per minute respectively. Equilibrium constant for the reaction is?
A 1.0 M NaOH reacts with 20 mL of HCl solution for complete neutralisation. The molarity of HCl solution is?
The volume strength of 1.5 N H2O2 solution is?
A circular current carrying coil has a radius \( R \). The distance from the center of the coil on the axis, where the magnetic induction will be \( \frac{1}{8} \) to its value at the center of the coil is?
The incorrect statement regarding the lines of force of the magnetic field \( B \) is?
Two coils have a mutual inductance of 0.55 H. The current changes in the first coil according to the equation \( I = I_0 \sin \omega t \), where \( I_0 = 10 \, A \) and \( \omega = 100 \, \text{rad/s} \). The maximum value of emf in the second coil is?
An L-C-R circuit contains \( R = 50 \, \Omega \), \( L = 1 \, \text{mH} \), and \( C = 0.1 \, \mu\text{F} \). The impedance of the circuit will be minimum for a frequency of?
An eye can detect \( 5 \times 10^4 \) photons per square meter per second of green light ( \( \lambda = 500 \, \text{nm} \)) while the ear can detect \( 10^{-12} \, \text{W/m}^2 \). The factor by which the eye is more sensitive as a power detector than ear is close to?
The sodium extract of an organic compound on acidification with acetic acid and addition of lead acetate solution gives a black precipitate. The organic compound contains?
If the electron in the hydrogen atom jumps from the third orbit to second orbit, the wavelength of the emitted radiation in terms of Rydberg constant is?
Silver has a work function of 4.7 eV. When ultraviolet light of wavelength 100 nm is incident on it, a potential of 7.7 V is required to stop the photoelectrons from reaching the collector plate. How much potential will be required to stop photoelectrons when light of wavelength 200 nm is incident on it?
If the distance of 100 W lamp is increased from a photocell, the saturation current in the photocell varies with the distance \( d \) as?
Following process is known as?
During charging a capacitor, variations of potential \( V \) of the capacitor with time \( t \) is shown as?
When a resistor of 11 Ω is connected in series with an electric cell, the current following in it is 0.5 A. Instead, when a resistor of 5Ω is connected to the same electric cell in series, the current increases by 0.4 A. The internal resistance of the cell is?
A battery is charged at a potential of 15 V in 8 h when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 h. The mean terminal voltage during discharge is 14V. The watt-hour efficiency of the battery is?
Which has more luminous efficiency?
The resistance of a germanium junction diode whose \( V-I \) is shown in figure is ( \( V_k = 0.3 \, V \))?
In hydrogen discharge tube, it is observed that through a given cross-section \( 3.31 \times 10^{15} \) electrons are moving from right to left and \( 3.12 \times 10^{8} \) protons are moving from left to right. The current in the discharge tube and its direction will be?
In a semiconductor, separation between conduction and valence band is of the order of?
If 1000 droplets each of potential 1 V and radius \( r \) are mixed to form a big drop, then the potential of the drop as compared to small droplets will be?
A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure. The current through the diode is?
The activity of a radioactive sample is measured as \( N_0 \) counts per minute at \( t = 0 \) and \( N \) counts per minute at \( t = 5 \) min. The time, in minutes, at which the activity reduces to half its value is?
The output Y of the logic circuit shown in figure is best represented as?