The energy of a Hydrogen atom in its first excited state is

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 :

The ratio of energies of photons produced due to the transition of an electron of hydrogen atom from its
i. second permitted energy level to the first level and
ii. the highest permitted energy level to the first energy level is

The ratio of shortest wavelength of lines in Balmer and Paschen series is :

Match List - I with List - II.

List - I (Electronic Device)	List - II (Application)
(A) Zener diode	(I) Rectifier
(B) Capacitor	(II) Amplifier
(C) Transistor	(III) Voltage regulator
(D) p-n junction diode	(IV) Filter circuit

Choose the correct answer from the options given below :

Two electrons are moving with different kinetic energies. If 1st electron is moving with kinetic energy \( k \) and the 2nd electron with kinetic energy \( 4k \), the ratio of their de Broglie wavelengths will be respectively:

A symmetric double convex lens of power 4D is cut in two halves by plane perpendicular to the principal axis. The power of each half is :

Which of the following sugars does not undergo hydrolysis?
(A) Glucose
(B) Fructose
(C) Cane Sugar
(D) Lactose
Choose the correct answer from the options given below:

The value of \(\int_{-\frac{\pi}{2}}^{\frac{\pi}{2}}(\sin |x|+\cos |x|) d x\), is equal to:

When a potential difference is applied across the ends of a conductor, the electric field exists :

Alcohol is a depressant, which means that even small amounts of alcohol slow down the actions of parts of the brain, so alcohol lengthens the time you take to respond to a stimulus.
Different people react differently to alcohol. In some people, it increase their feelings of aggression, and releases their inhibitions so that they are more likely to be violent or commit other crimes.
An alcoholic needs to drink quite large quantities of alcohol regularly. This causes many parts of the body to be damaged, because alcohol is poisonous to cells. Probably, there are many factors which decide whether or not a person becomes alcoholic. Over a long period of time, it can cause loss of memory and confusion. One way in which the damage is done is that alcohol in the body fluids draws water out of cells by osmosis.
Alcohol lengthens the time one takes to respond to a stimulus. This occurs due to

Which of the following is the best reducing agent to convert RCOOH into \(RCH _2 OH\) ?

Which of the following statements is/are incorrect?