An electron accelerated with potential V has a de-Broglie wavelength \( \lambda \) associated with it. If the potential is changed to 4 V, the wavelength becomes

A cylindrical wire is stretched to increase its length by 10%. The percentage increase in resistance will be

A plano-convex lens has focal length 0.5 m and the retractive index of the material of the lens is 1.5. The radius of curvature of the convex surface of the lens is

If the work function of a target is 1.25 eV and the wavelength of incident radiation is 2460 \( \text{\AA} \), the stopping potential required to stop the emitted electrons is :
Given : \( h = 6.6 \times 10^{-34} \text{ Js} \)

A p-n junction can act basically as

X-rays of wavelength \( = 1\text{\AA} \) have frequency

A long straight wire is carrying a current of 20 A. An electron is moving with a speed of \( 10^7 \text{ m/s} \) parallel to the wire. The force experienced by the electron when it is 2 cm away from the wire is:

Consider the various type of Innate Immunity and Match List I with List II

List - I	List - II
(A) Skin	(I) Physiological barrier
(B) Saliva	(II) Physical barrier
(C) Leukocyte	(III) Cytokine barrier
(D) Interferon	(IV) Cellular barrier

Choose the correct answer from the options given below:

Which traditional drink is made by fermenting palm sap?

The feasible region represented by the constraints \(x+2 y \geq 100,2 x-y \leq 0.2 x+y \leq 200, x \geq 0, y \geq 0\) of an LPP is

Sequence of steps for retrovirus infection in host cell are:
A. Transfer of viral RNA into host cell.
B. Production of viral RNA by infected cell.
C. Incorporation of viral DNA into host genome.
D. Production of viral DNA by reverse transcriptase.
Choose the correct answer from the options given below:

Reaction of \(C _6 H _5 CH _2 Br\) with aqueous sodium hydroxide follows preferably:

Answer the question on basis of passage given below :
P block elements are placed in groups 13 to 18 of the periodic table. Their valence shell electronic configuration is \(ns^2 np^{1-6}\). Group 16 of the p block elements are known as the group of chalcogens having \(ns^2 np^4\) as their general electronic configuration. They exhibit number of oxidation states but the stability of \(- 2\) oxidation state decreases down the group. They are sometimes also known as group of chalcogens as the name is derived from the Greek word for brass and points to the association of sulphur and its congeners with copper. Their ionisation enthalpy decreases down the group. Oxygen shows anomalous behaviour due to its small size and high electronegativity.
What will be the products formed in the following equation?