Which of the following happens when a ray of light enters into a water filled glass beaker from air?

The electric field of an electric dipole at a large distance is proportional to :

In a double slit experiment, if the distance between the slits be reduced to half, then the new fringe width will be

The ratio of the Nuclear density of the gold isotope \(^{197}_{79}\text{Au}\) and the silver isotope \(^{107}_{47}\text{Ag}\) is :

Choose the correct option from the following transitions in which the wavelength will be minimum

The phenomenon of polarisation of light confirmed that light waves are

What is the distance that a beam of light of wavelength 500 nm can travel without significant broadening, if the diffracting aperture is 3 mm wide ?

The area of the region bounded by parabola \(x^2=4 y\), straight line \(x=2\) and \(x\)-axis, is

If a computer code is correctly programmed, it gives \(90\%\) acceptable results. But if it is not correctly programmed, it gives only \(40\%\) acceptable results. From previous experience, it is observed that only \(80 \%\) of codes are correctly programmed. If after a certain programming, the code gives 2 acceptable results then the approximate probability that the code is correctly programmed is

Arrange the following oxides in decreasing order of oxidation state of the metal ion.
(A) Cu\(_2\)\(\mathrm{O}\)
(B) CrO\(_3\)
(C) Mn\(_2\)\(\mathrm{O}_7\)
(D) V\(_2\)\(\mathrm{O}_5\)
Choose the correct answer from the options given below:

The most effective electrolyte for the coagulation \(Fe_2O_3\cdot H_2O/Fe^{3+}\) is:
A. AgCl
B. FeCl3
C. \(MgCl _2\)
D. \(K_4[Fe(CN)_6]\)
E. KCl
Choose the correct answer from the options given below:

Answer the question on basis of passage given below :
The noble gases have closed shell electronic configuration and are monatomic gases under normal conditions. The low boiling points of lighter noble gases are due to the weak dispersion forces between the atoms and the absence of other inter atomic interaction. The direct reaction of xenon with fluorine leads to a series of compounds with oxidation numbers \(+2, +4\) and \(+6\).
\(\text{XeF}_4\) reacts violently with water to give \(\text{XeO}_3\). The compound of Xenon exhibit stereoisomerism and their geometries can be deduced considering the total number of electrons in the valence shell.
\(X e F _4 \quad\) and \(X e F _6 \quad\) are expected to be :

Read the following paragraph carefully and answer the given questions.
Certain types of leukocytes (WBC) of our body like polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes. For determining the cause of allergy, the patient is exposed to or injected with very small doses of possible allergens, and the reactions studied. The use of drugs like anti-histamine, adrenalin and steroids quickly reduce the symptoms of allergy. Heroin, commonly called smack is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound. This is obtained by acetylation of morphine. Techniques like radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are very useful to detect cancers of the internal organs. Different species of Plasmodium (P. vivax, P. malaria and P. falciparum) are responsible for different types of malaria. Of these, malignant malaria caused by Plasmodium falciparum is the most serious one and can even be fatal.
Heroin, commonly called smack is chemically __________ which is a white, odourless, bitter crystalline compound.