NEET Test 199...

A coil of wire of radius R has 200 turns and self – inductance of 108 mH. The self – inductance of a similar coil of 500 turns will be:

A point source of light is kept at a distance of 15 cm from a converging lens, on its optical axis. The focal length of the lens is 10 cm and its diameter is 3 cm. A screen is placed on the other side of the lens, perpendicular to the axis of the lens, at a distance 20 cm. from it. Then find the area of the illuminated part of the screen?

The bond dissociation energy of B − F in BF₃ is 646 kJ per mol whereas that of C − F in CF₄ is 515 kJ mol−1. The correct reason for higher bond dissociation energy of B − F bonds than that of C − F bond is

Which of the following monocyclic ring compounds do not obey Huckel's rule?

P. C₁₂H₁₂^2-

Q. C₁₂H₁₂²⁺

R. C₂₀H₂₀^-

S. C₂₀H₂₀⁺

In a DNA strand the nucleotides are linked together by:

How many electrons are present in m shell of an element with atomic number 20​:

A rocket is fired from Earth to the Moon. The distance between Earth and the Moon is r and the mass of Earth is 81 times the mass of the Moon. The gravitational force on the rocket will be zero when its distance from the Moon is:

When a body moves in a circular path, no work is done by the force since:

Exudation and guttation are due to:

The decomposition of Cl₂O₇ at 400 K in the gas phase to Cl₂ and O₂ is a first order reaction. After 55 seconds at 400 K, the pressure of Cl₂O₇ falls from 0.062 atm to 0.044 atm. Calculate the pressure of Cl₂O₇, after 100 sec. of decomposition at the temperature.