In order to fabricate n-type semiconductor, the impurity elements used are

The focal length of the objective of a compound microscope is \( f_o \) and its distance from the eyepiece is L. An object is placed at a distance u from the objective. For proper working of the instrument
(A) L < u
(B) L > u
(C) \( f_o < L < 2f_o \)
(D) L > \( 2f_o \)
Choose the correct answer from the options given below:

Two parallel conductors each carrying a current of 10 mA in opposite directions are placed at a distance 10 cm apart. The force per unit length between two conductors is

Dimensional formula of Planck constant is:

A cylindrical coil of radius \(r\), having \(n\) turns per unit length and carrying a current \(I\) has a magnetic field near its end equal to:

A long solenoid has 500 turns. When a current of 2 A is passed through it, the resulting magnetic flux linked with each turn of the solenoid is \(4 \times 10^{-3} Wb\). The self-inductance of the solenoid is

The energy in the sun is generated mainly by:

If white colour flower of Antirrhinum sp. successfully crossed with the pink
colour flower, what would be the proportion of white and pink color flowers
in the next generation?

For any two non zero vectors \(\vec{a}\) and \(\vec{b}\)
A. If \(|\vec{a}| = |\vec{b}|\) then \(\vec{a} = \vec{b}\)
B. If \(\vec{a} = \vec{b}\) then \(|\vec{a}| = |\vec{b}|\)
C. \(\vec{a} \cdot \vec{b} = \vec{b} \cdot \vec{a}\)
D. \(\vec{a} \times \vec{b} = \vec{b} \times \vec{a}\)
E. area of the parallelogram = \(\frac{1}{2}|\vec{a} \times \vec{b}|\), where \(\vec{a}\) and \(\vec{b}\) represent the diagonals of the parallelogram.
Choose the correct answer from the options given below:

The winding of the solenoid with 1000 turns per meter, core material with relative permeability 400 and carrying a current of 2 A, the magnetisation (M) is approximately given by :

Read the passage carefully and answer the questions
Carbohydrates are naturally formed organic compounds from various plants. The common chemical formula, \(C _x\left( H _2 O \right)_y\), was considered as hydrates of carbon to derive the various carbohydrates. For instance, the general formula for glucose ( \(C _6 H _{12} O _6\) ) easily fits into the above formula. Carbohydrates also called saccharides are classified on the basis of their behavior towards hydrolysis. Monosaccharides cannot be hydrolyzed further to simpler units of polyhydroxy aldehyde or ketones. About 20 monosaccharides are known to occur in nature. Carbohydrates that yield large number of monosaccharide units are called polysaccharides. Amino acids contain ( \(- NH _2\) ) and ( - COOH ), which can be classified in various forms. Proteins are polymers of alpha amino acids which are connected to each other by a peptide bond or peptide linkage. When a native protein is subjected to physical change, its globules unfold and helix get uncoiled and the protein loses its biological activity. The protein is said to be denaturated.
The two monosaccharides units are joined together through which linkage ?

Which codon has dual functions?

Consider a closed cylinder of radius \(r\) with a fixed surface area. The volume of the cylinder is maximum when its height is :