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1

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)
Which property of colloidal solution is independent of charge on the colloidal particles?
A
Electro-osmosis
B
Tyndall effect
C
Coagulation
D
Electrophoresis

Explanation

Tyndall effect is the scattering of light by sol particles which cannot be affected by charge on them.
2

AIPMT 2014

MCQ (Single Correct Answer)
Which property of colloids is not dependent on the charge on colloidal particles?
A
Coagulation
B
Electrophoresis
C
Electro-osmosis
D
Tyndall effect

Explanation

Tyndall effect is due to the scattering of light by colloidal particles and not due to the charge.
3

AIPMT 2012 Prelims

MCQ (Single Correct Answer)
The protecting power of lyophilic colloidal sol is expressed in terms of
A
coagulation value
B
gold number
C
critical micelle concentration
D
oxidation number

Explanation

The lyophobic sols are less stable than lyophilic sols. The lyophilic sols are thus used to protect the lyophobic sols. This property of lyophilic sols is known as protective action of lyophilic sols.

Which can be represented by gold number. Lesser the gold number, higher is the protecting power.
4

AIPMT 2012 Prelims

MCQ (Single Correct Answer)
Which one of the following statements is incorrect about enzyme catalysis?
A
Enzymes are mostly proteinous in nature.
B
Enzyme action is specific.
C
Enzymes are denatured by ultraviolet rays and at high temperature.
D
enzymes are least reactive at optimum temperature.

Explanation

Enzymes are most reactive at optimum temperature. The optimum temperature for enzyme activity lies between 40°C to 60°C.

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