Which statements are true for X-ray ?
(A) The wavelength range of X-rays is about \( 10^{-8} \, \text{m} \) to \( 10^{-13} \, \text{m} \).
(B) X-rays can't affect a photographic film.
(C) X-rays can damage living tissues.
(D) We can generate X-rays by bombarding a metal target by high energy electrons.
(E) The wave length of X-rays is more then Microwave.
Choose the correct answer from the options given below :

For a photosensitive surface, work function is \( 3.3 \times 10^{-19} \, \text{J} \). Taking Planck's constant to be \( 6.6 \times 10^{-34} \, \text{Js} \), the threshold frequency would be:

The coherent monochromatic light beams of intensities \( 4I \) and \( 9I \) are superposed. What will be the maximum and minimum possible intensities?

The displacements of four light waves are given below. If the amplitudes \( a_1 \) and \( a_2 \) are nearly equal, then the interference fringes may be observed due to superposition of:
(A) \( y = a_1 \sin \omega t \)
(B) \( y = a_2 \sin (\omega t + \phi) \)
(C) \( y = a_1 \sin 2\omega t \)
(D) \( y = a_2 \sin 3(\omega t + \phi) \)

The fraction of tritium remains undecayed after 25 years, if its half life is 12.5 years will be:

Which of the following is an incorrect statement?

What is the effect on the focal length of a convex lens when it is immersed in a liquid whose refractive index is equal to refractive index of the lens ?

The area (in sq. units) of the region bounded by the curve \(y=\sqrt{16-x^2}\) and x-axis is

In inorganic salt analysis, for the indicatory test of \(Cl^-\), conc. \(H_2SO_4\) is used. This is because:

Number of solutions of the equation \(\left|\begin{array}{ccc}-1 & 0 & \sin \theta \\ \sin \theta & -1 & 0 \\ 0 & \sin \theta & -1\end{array}\right|=0\) in \((0, \pi)\) is:

In an LPP, if the objective function Z = ax + by has the same maximum value at two corner points of the feasible region, then the number of points of which \(Z_{\max }\) Occurs is:

Match List - I with List - II.

List - I	List - II
(A) Entamoeba histolytica	(I) Filariasis
(B) Wuchereria bancrofti	(II) Malaria
(C) Microsporum	(III) Amoebiasis
(D) Plasmodium falciparum	(IV) Ringworm

Choose the correct answer from the options given below:

Read the passage carefully and answer the questions
The carbonyl group of aldehydes and ketones is highly polar. The positively charged carbon is readily attacked by electron-rich nucleophile and the negatively charged oxygen atom is attacked by an electro-deficient electrophile. Aldehydes and ketones undergo nucleophilic addition reactions in the presence of acid or a base. The mechanism involves attack of a nucleophile on the electron deficient carbonyl carbon to form a tetrahedral intermediate. A new bond is formed between the carbon and oxygen. Protonation of the anion furnished by the reaction medium yields neutral addition product. The addition product is same whether the reaction is catalyzed by acid or a base. For example in the presence of base aldehydes and ketones react with hydrogen cyanide to form cyanohydrin.
Which of the following compounds will undergo nucleophilic addition readily?