Kirchhoff's First Law, \( \sum I = 0 \) at a junction deals with conservation of :

Match List - I with List - II.

List - I	List - II
(A) Negative susceptibility	(I) Ferromagnetic material
(B) Weak attraction to magnet	(II) Paramagnetic material
(C) Hysteresis loop	(III) Diamagnetic material
(D) \( \mu > \mu_0 \)	(IV) Retentivity

Choose the correct answer from the options given below:

When copper and germanium are cooled from room temperature to 100 K, then :

Choose the correct statements, when a cell of emf E and internal resistance r connected to external resistance R having current I flowing through the circuit is:
A. Potential difference across the terminals of the cell in a closed circuit having resistance R is always less than the emf.
B. For practical calculations, the internal resistance of the cells in the circuits may be neglected when the current I is such that E >> I.
C. Terminal potential difference in a closed circuit is always more than emf E.
D. Terminal potential difference versus current graph for a cell with closed circuit having resistance R is a straight line with a negative slope.
Choose the correct answer from the options given below:

The electric potential for an electric dipole

Choose the correct statements regarding infra red waves from the following.
(A) Infra red waves produced by hot bodies and molecules.
(B) This radiation is trapped by greenhouse gases such as \( CO_2 \) and water vapour.
(C) These waves are used in earth satellites.
(D) Exposure to these radiation induces the production of more melanin.
(E) These radiations are used in eye surgery.
Choose the correct answer from the options given below :

The de Broglie wavelength associated with a proton moving with a speed of 1 m/s will be :
[Plank's Constant \( = 6.63 \times 10^{-34} \text{ J s}, M_p = 1.6 \times 10^{-27} \text{ kg} \)]

Arrange the correct sequence of steps for gel electrophoresis.
(A). Load this DNA into the agarose gel matrix
(B). Cutting the DNA fragments by using a restriction enzyme
(C). Use ethidium bromide for DNA staining
(D). Separated bands of DNA are cut out from agarose gel
Choose the correct answer from the options given below.

\(\text{If} A \text{ and } B \text{ are independent events with }P(A)=0.8 \text{ and } P(B)=0.4,\text{ then the value of } P(A\cup B) \text{ is: \)

If we plot graph for first order reaction involving reactant \(R\), then it will be a straight line if plotted for :

From the statements given below, choose the correct statement regarding the galvanic cell.

Answer the question on basis of passage given below :
Molecular nitrogen is very little reactive chemically. During lightning discharge, atmospheric nitrogen and oxygen combines to form nitric oxide which also combines with oxygen to form nitrogen dioxide. Both NO and \(NO _2\) constitute smog which is very poisonous. It can cause burning sensation in the eyes and adversely affect respiratory system.
Molecular nitrogen is very little reactive since it has -

Read the passage carefully and answer the questions
Carboxylic acids are the organic compounds which comprise of carboxyl functional group, -COOH. These are generally found in nature, some higher members are known as fatty acids as they occur in natural fats as esters of glycerol. They can be prepared from oxidation of alcohols and aldehydes, hydrolysis of nitriles and amides and Grignard reagents. They are stronger acids than simple phenols and alcohols. but weaker than mineral acids. Substituents affect the acidity of aliphatic and aromatic carboxylic acids. They undergo reactions involving cleavage of -OH and C-OH bond. Carboxylic acids having an alpha hydrogen get halogenated in the presence of red phosphorus to form alpha halo carboxylic acids. The reaction is known as Hell Volhard Zelinsky reaction. Besides these aromatic carboxylic acids undergo electrophilic substitution reactions. They are versatile and are employed in the manufacture of various useful compounds. For example, methanoic acid is used in rubber, textile, dyeing, leather and electroplating industries. Higher fatty acids are used in the manufacture of soaps and detergents. Esters of Benzoic acid are used in perfumery.
Which carboxylic acid will not undergo HVZ reaction?