List of practice Questions

In a ’transcription unit’, the ’terminator’ is located towards the:
A population is in genetic equilibrium/Hardy-Weinberg equilibrium for a gene with 2 alleles (dominant allele is ‘A’ and recessive allele ‘a’). If the frequency of allele ‘A’ is 0.6, then the frequency of genotype ‘Aa’ is:
In the double helical structure of DNA molecule, the strands are:
In humans, the secondary oocyte completes meiotic division when:
Which one of the following statements is not true?
An angiosperm embryo sac is located within the:
Which of the following is a polar molecule?
In a diode, the reverse current is practically not dependent on the applied voltage.
A thin spherical shell of radius \( R \) has a uniform surface charge density \( \rho \). Using Gauss' law, deduce an expression for the electric field:
(i) Outside the shell.
(ii) Inside the shell.
A plane light wave propagating from a rarer into a denser medium, is incident at an angle \( i \) on the surface separating two media. Using Huygen’s principle, draw the refracted wave and hence verify Snell’s law of refraction.
In a Young’s double slit experiment, the slits are separated by 0.30 mm and the screen is kept 1.5 m away. The wavelength of light used is 600 nm. Calculate the distance between the central bright fringe and the 4thx dark fringe.
In a series LCR circuit, establish the conditions under which:
[(i)] impedance is minimum and
[(ii)] wattless current flows in the circuit.
Describe the construction and working of a transformer and hence obtain the relation for \( \frac{V_s}{V_p} \) in terms of the number of turns of primary and secondary.
Discuss four main causes of energy loss in a real transformer.
Discuss briefly diffraction of light from a single slit and draw the shape of the diffraction pattern.
An object is placed between the pole and the focus of a concave mirror. Using mirror formula, prove mathematically that it produces a virtual and enlarged image.
Draw equipotential surfaces for an electric dipole.
equipotential surfaces for an electric dipole.
Two point charges \( q_1 \) and \( q_2 \), are located at \( \vec{r_1} \) and \( \vec{r_2} \) respectively in an external electric field \( \vec{E} \). Obtain an expression for the potential energy of the system.
The dipole moment of a molecule is \( 10^{-30} \, \text{Cm} \). It is placed in an electric field \( \vec{E} \) of \( 10^5 \, \text{V/m} \) such that its axis is along the electric field. The direction of \( \vec{E} \) is suddenly changed by \( 60^\circ \) at an instant. Find the change in the potential energy of the dipole, at that instant.
You are given three circuit elements X, Y, and Z. They are connected one by one across a given ac source. It is found that \( V \) and \( I \) are in phase for element X. \( V \) leads \( I \) by \( \frac{\pi}{4} \) for element Y while \( I \) leads \( V \) by \( \frac{\pi}{4} \) for element Z. Identify elements X, Y, and Z.
Establish the expression for impedance of the circuit when elements X, Y, and Z are connected in series to an AC source. Show the variation of current in the circuit with the frequency of the applied AC source.
Two capacitors of capacitances \( 2C_0 \) and \( 6C_0 \), are first connected in series and then in parallel across the same battery. The ratio of energies stored in series combination to that in parallel is:
The critical angle for glass is \( \theta_1 \) and that for water is \( \theta_2 \). The critical angle for the glass-water surface would be (given \( \mu_g = 1.5 \), \( \mu_w = 1.33 \)):
When a ray of light of wavelength \( \lambda \) and frequency \( \nu \) is refracted into a denser medium,
The critical angle for a ray of light passing from glass to water is minimum for