1 Surface Chemistry
Which property of colloidal solution is independent of charge on the colloidal particles?
1) Coagulation 2) Electrophoresis 3) Electroosmosis 4) Tyndall effect
The Tyndall effect is light scattering by particles in a colloid or in a very fine suspension. Coagulation is a chemical process that involves neutralization of charge whereas flocculation is a physical process and does not involve neutralization of charge. Electrophoresisstrong - > is the motion of dispersed particles relative to a fluid under the influence of a spatially uniform electric field. Electrophoresis of positively charged particles is sometimes called cataphoresis, while electrophoresis of negatively charged particles is sometimes called anaphoresis. Electro-osmosisstrong - > refers to the movement of liquid in a porous material due to an applied electric field
2
One of the following occurs both in fresh water and marine habitat1.) Spirogyra2) Riccia3) Cladophora4) Oedogonium
3 Work Energy and Power
A cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of g/2. Then the work done by the cord on the block is: 1.– Mgd/4 2.– 3Mgd/4 3.– Mgd/2 4.– 3Mgd/2
4
The type of fruit found in jack fruit and monkey fruit is
(1) Sorosis
(2) Syconus
(3) Sorosis and suyconus, respectively
(4) Syconus and sorosis, respectively
5
G1, S and G2 stages are seen in
(1) Anaphase (2) Interphase (3) Metaphase (4) Prophase
6 Atoms and Nuclei
The rest mass of a photon is:
(1) Dependant on velocity (2) Zero (3) Very large (4) Very small
7 Chemistry in Everyday Life
Which type of dyes are not used to dye nylon and polyester fibres?
1) Vat dyes 2) Basic dyes 3) Disperse dyes 4) Insoluble azo dyes
Vat dyes are not used to dye nylon and polyester fibres but used ot dye cotton fibres. Basic dyes disperse dyes and insoluble azo dyes. However, are used to dye nylon and polyesters.
8
Hypnotoxin is poisonous fluid produced by1. Parasitic protoza2. Nematocysts3. Sponges4. Ascaris
9
Medulla oblongata contains 1) I Ventricle 2) II Ventricle 3) III Ventricle 4) IV Ventricle
10 Excretory Products and their Elimination
Which waste product of a grasshopper may be retained and used in other metabolic activities?
1) water 2) uric acid 3) carbon dioxide 4) feces
The four metabolic waste products are water, carbon dioxide, salts, and nitrogenous wastes. Water is necessary for many chemical reactions including hydrolysis but it is a waste product of dehydration synthesis occurring in the cells.
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