An electric source has an emf of 130 V and a terminal voltage of 110 V. If it supplies a terminal current of 20 A, its internal resistance will be

A current of 10 A is flowing in a wire of length 1.5 m. When placed in a uniform magnetic field of 2 T, it experiences a force 15 N. The angle between the magnetic field and the direction of flow of current is

Which combination is to be selected for better tuning of an LCR series circuit used for communication ?

Which of the following is an incorrect statement?

Which of the following is a transducer in communication system.

Consider the figure as shown below. If work done in bringing a point charge from infinity to points A, B and C are \( W_A, W_B \) and \( W_C \) respectively, then, which of the following relation is correct?

A resistor of resistance \( 30 \, \Omega \) and a capacitor of capacitance \( (250 \pi^{-1}) \, \mu\text{F} \) are connected in series to a 220 V, 50 Hz source. The current in the circuit is

Let y be a discrete random variable, taking values \(y_1, y_2, y_3, ..., y_n\) with probabilities \(p_1, p_2, p_3, ..., p_n\) respectively. Then the standard deviation of y is given by:

Observe the figure and answer the following:


What is represented by figure D?

Which one of the followings is an indirect measure of the organic matter present in water?

Nitration of aniline with nitric acid and sulphuric acid gives major product as

Read the passage carefully and answer:
Organic compounds derived from NH3 by replacing one or more H-atoms with alkyl or aryl groups will form primary, secondary and tertiary amines. The common methods which include their preparations are reduction of nitro group, amide group and nitrile group, Gabriel phthalimide synthesis and ammonolysis of alkyl halides. Amines are basic in nature due to the presence of a lone pair of electrons on the nitrogen atom. Important chemical properties of amines include acylation, alkylation and their interaction with nitrous acid. There are various tests which can distinguish different types of amines from each other, for e.g. carbylamine test, Hinsberg's test, coupling reaction etc. Another important class of compounds which can be derived from primary amines is azo compounds. These compounds are intensely colored and widely used as dyes in textile, leather and food industries.
How many different structural isomers that correspond to the molecular formula \(\mathrm{C}_3 \mathrm{H}_9 \mathrm{~N}\) are possible? Out of these, how many will give a positive carbylamine test?

The rate law for the given reaction
CH\(_3\)\(\mathrm{CH}_2\)Cl + NaOH \(\rightarrow\) CH\(_3\)\(\mathrm{CH}_2\)OH + NaCl
is given by r = k[CH\(_3\)\(\mathrm{CH}_2\)Cl]. The rate of reaction will be: