Seven lead accumulators, each of emf 2 V, and internal resistance \( 0.07 \text{ } \Omega \), are connected in series with an external resistance \( 9.51 \text{ } \Omega \). The current in the circuit is

Total internal reflection can take place only, if

When a dielectric slab is introduced in between the plates of a charged capacitor with battery connected across the plates, following are the observations. Choose which observation is incorrect?

A proton and an alpha particle of the same velocity enter in turn a region of uniform magnetic field, acting perpendicular to their direction of motion. The ratio of the radii of the circular paths described by the particles, respectively, would be

The height of transmitting antenna and receiving antenna are 45 m and 80 m. If the radius of earth is \( 6.4 \times 10^6 \text{ m} \), then the maximum distance between the two antennas for satisfactory communication in LOS mode is:

A light with an energy flux of 25 \( W/cm^2 \) falls on a non-reflecting surface at normal incidence. If the surface has an area of 50 \( cm^2 \) and the total energy falling on the surface is \( 10 \times 10^5 \) J. The total duration of time of the incidence of light is

The current and power dissipation in an inductor coil are 2 A and 200 W, respectively.
When connected to an alternating source of 220 V, 50 Hz. The resistance and inductance of the coil are (take \( \pi^2 = 10 \)):

The different methods of producing plane polarised light are
(A) Reflection
(B) Scattering
(C) Double Refraction
(D) Selective absorption
Choose the correct answer from the options given below:

What are the products of the following reaction in neutral solution?
\(\mathrm{MnO}_4^{-}+\mathrm{S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \rightarrow ?\)

Certain Aldehydes, Retore and certain alcohol undergo iodoform test. Certain Aldehydes ketones undergo aldol condensation. While certain aldehydes undergo Cannizaro's reaction. Aldehydes responds to tollen reagent and fehling reagent test.
Which amongst the following will respond to both Tollens' reagent test and Fehling's reagent test?

Read the passage carefully and answer the questions
Many halogen containing organic compounds are present in nature and some of them are clinically useful. These classes of organic compounds find a wide range of applications in our daily life as well as in industries. Many of the polyhalogen compounds are useful too in agriculture. However, some of these compounds cannot be easily decomposed and are thus considered to be environmental hazards. These halo compounds are prepared via different synthetic routes where a variety of organic compounds can be used as substrates such as amines, hydrocarbons etc. They are used as solvents for relatively non-polar compounds. These compounds exhibit substitution and elimination reactions, in addition to their reactions with different metals, which leads to the formation of a versatile starting material for others organic compounds.
Alkyl halides react with sodium in dry ether and give hydrocarbon containing double the number of carbon atom present in the halides. The reaction is known as:

Match List - I with List - II.

List - I	List - II
(A) Diamagnetic solid	(I) \(CrO _2\)
(B) Ferromagnetic solid	(II) \(Fe _3 O _4\)
(C) Antiferromagnetic	(III) NaCl
(D) Ferrimagnetic solid	(IV) MnO

Choose the correct answer from the options given below :

The statement "all tax payers above 60 years in India" is an example of
(A) Sample
(B) Finite population
(C) Infinite population
(D) Statistical Interference