Which of the following statements are not true for equipotential surfaces ?
A. Equipotential surface through a point is normal to electric field at that point.
B. There is a constant potential difference between any two points on the equipotential surface.
C. No work is required to move a test charge on the equipotential surface.
D. The vale of electric potential is constant at all points on the equipotential surface.
E. Equipotential surfaces can not be drawn for an electric dipole.
Choose the correct answer from the options given below :

Choose the correct statements, when a cell of emf E and internal resistance r connected to external resistance R having current I flowing through the circuit is:
A. Potential difference across the terminals of the cell in a closed circuit having resistance R is always less than the emf.
B. For practical calculations, the internal resistance of the cells in the circuits may be neglected when the current I is such that E >> I.
C. Terminal potential difference in a closed circuit is always more than emf E.
D. Terminal potential difference versus current graph for a cell with closed circuit having resistance R is a straight line with a negative slope.
Choose the correct answer from the options given below:

Two point charges \(+3 \mu C\) and \(-8 \mu C\) attracts each other with a force of 40 N , when separated by finite distance d . If a charge of \(+5 \mu C\) is added to each of them, then the force between them will become:

The graphs of stopping potential versus frequency of incident radiation for two metals A and B are given.
Identify the correct statement(s) from the following:

(A) The slope of the graphs is equal to the Planck's constant.
(B) Intercept on the (-y) axis is equal to (work function/e).
(C) Threshold frequency for metal A is higher than metal B.
(D) Work function for metal B is greater than metal A.
Choose the correct answer from the options given below:

P, Q, R and S are four wires of resistances 3, 3, 3 and 4 \(\Omega\) respectively. They are connected to form the four arms of a wheatstone bridge circuit. The resistance with which S must be shunted in order that the bridge may be balanced is :

White light is used to illuminate the two slits in a Young's double slit experiment. The separation between the slits is b and the screen is at a distance D from the slits. At a point on a screen directly in front of one of the slits, certain wavelength are missing. Some of these wavelengths are :
(A) \( \lambda = \frac{b^2}{D} \)
(B) \( \lambda = \frac{2b^2}{D} \)
(C) \( \lambda = \frac{b^2}{3D} \)
(D) \( \lambda = \frac{2b^2}{3D} \)
Choose the correct answer from the options given below :

Select the correct option for the statements given below.
(A) The diffraction pattern is a superposition of waves originating from each point on a single slit.
(B) The interference pattern is the superposition of two waves originating from two narrow slits.
(C) The diffraction pattern in single slit has a central bright maximum brighter than other maxima.
(D) The interference in double slit has a number of equally spaced bright and dark bands.
Choose the correct answer from the options given below :

Down's syndrome is a genetic disorder. It is due to:

When white light consisting of wavelengths ranging from 400 nm to 700 nm passes through water (u = 4/3), then the wavelength range in water will be :

What amount of bromine will be required to convert \(6 g\) of phenol into 2,4,6-tribromophenol?

Identify the incorrect statement about glucose.

Light of wavelength 600 nm is incident normally on a slit of width 0.03 cm. The width of the central maximum on the screen placed 1 m away from the slit is

5 M sugar solution is \(30 \backslash \%\) sugar by mass. Calculated density of the solution will be, given that molecular weight of sugar is \(342 g mol ^{-1}\).