In an AC circuit, the power factor :

A regular hexagon of side 12 cm has a charge of 6 \( \mu\text{C} \) at each of its vertices. What will be the potential at the centre of the hexagon?

An unpolarized light of intensity \(I_0\) is passed through a polariser and is incident on an analyser making an angle of \((\pi/6) \text{ rad}\) with that of the polariser. The intensity of the light transmitted from the analyzer is

The wave theory of light can not explain the phenomenon of

In a parallel plate capacitor, each plate has an area of \(7 \times 10^{-3} \text{ m}^2\) and the distance between the plates is 2 mm. The space between the plates of the capacitor is filled with mica having dielectric constant 6. If the capacitor is connected to 120 V supply, the charge on each plate of the capacitor will be (Given: permittivity of the vacuum \(\epsilon_0 = 8.85 \times 10^{-12}\) SI unit)

igure given below shows variation of photocurrent with anode potential for different intensities of incident radiation. Some of the results obtained from the experiments are described below on the basis of the graph. Identify the correct results:

(A) The photoelectric current is higher for higher intensity of the incident radiation.
(B) The negative potential required to decrease the photocurrent at different intensities to zero is different.
(C) If the positive potential of the anode is increased beyond a certain value, the photocurrent does not increase for a given intensity.
(D) If the potential applied at the anode is zero, then the photocurrent is lower than the maximum value of current for the given intensity.
Choose the correct answer from the options given below:

A 10 cm long air-core solenoid of cross-sectional area \( 1.0 \, \text{cm}^2 \) contains 300 turns. Its inductance is:

Statins produced by the yeast variety is _______ which have been commercialised as blood-cholesterol lowering agents.

Arrange the following steps of rDNA technology in correct sequence.
(A) Amplification of gene by PCR
(B) Insertion of rDNA into host cell using vector
(C) Isolation of the genetic material from the cell
(D) Cutting the DNA at specific location
Choose the correct answer from the options given below :

The force between two electric charges is expressed by the equation : \( F = \frac{kq_1q_2}{r^2} \).
Which of the following is a correct statement ?

A medicinal plant growing in different Himalayan ranges shows different potency and concentration of the active chemical (reserpine) that the plant produces. Identify the plant:

In reference to Bt cotton, select the correct statement(s) :
(A) The alkaline pH of an insect gut solublises the crystals of Bt toxin
(B) The acidic pH of an insect gut solublises the crystals of Bt toxin
(C) The Bt toxin does not kill the tobacco budworm
(D) Specific Bt toxin genes were isolated from Bacillus thuringiensis
Choose the correct answer from the options given below :

The terminal voltage of a cell