Science General Knowledge - Multiple Choice #2

Nitrogen dioxide is reddish brown colored gas while other are colorless.

Centripetal, Reaction and Tension are actual force while centrifugal force is assumed by an observer.

θ=90 degree
W=F x S x cos θ and cos 90 degree = 0.
Hence,W = 0

K.E. can be equal to U but not always.
According to work - energy theorem,Increase in K.E = Work done and
U + K.E. = constant

Baeyer's process for Extraction of Aluminium....
Ostwald's Process for Nitric acid
Contact Process for Sulphuric acid
Haber's Process for Ammonia

The above reaction is exothermic, reversible and proceeds in hingh pressure and low temperature.

Alchemists called Nitric acid as Aqua fortis.

On moving across a period electron affinity increases and since Argon, having stable electronic configuration, has zero electron affinity. So chlorine has highest electron affinity among given options.

Its N-atom consists of covalent bonds with three H-atoms and one coordinate bond with H-Atom and this ammonium ion is electrovalently bonded with chlorine ion.

Virtual image is upright.
Real image can magnified, diminished or equal size.
A real can't be a virtual image(both are opposite).

Object at infinity, image at focus.
Object at 2f,image at 2f
Object Between First Focus and optical center,image behind object

Other are ohmic resistors.

Mass number decreases by four and atomic no. decreases by two , when one α - particle is emitted.
Loss of energy takes place when γ - particle is emitted.

Nuclear Fission is split of a heavy nucleus.
Nuclear reactor and atom bomb is based on Nuclear Fission.

Gibbrellins promote internode growth.
Cytokinins inhibit apical dominance.
ABA is growth retarding hormone.

Leukemia is increased no. of WBCs (abnormally).
Erythropenia is abnormally decreased no. of RBCs.