PBE NOV 2011

Question 1

Number of carbon atoms in olvanil

Answer 1

26 (C26H43NO3)

Question 2

Who discovered x-ray?

Answer 2

Wilhelm Conrad Roentgen

Question 3

How manny Amino acids in human protein?

Answer 3

20 amino acids. 9 of them are essential or cannot be made by the body.

Question 4

It us an organic reaction where the unsaturated bonds of alkenes, alkynes, or azo compounds are cleaved with ozone.

Answer 4

Ozonolysis

Question 5

Hydrocarbon, also called alkane, any of the saturated hydrocarbons having the general formula C nH 2n+2,

Answer 5

paraffins

Question 6

What is the center of an atom

Answer 6

Nucleus

Question 7

What do you call the blanket of pollutants?

Answer 7

Smog

Question 8

Pollutant produced from coal and petroleum.

Answer 8

Sulfur dioxide is the largest. Followind by NOx and COx

Question 9

Nearest layer of atmosphere from earth’s surface

a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere

Answer 9

a) Troposphere

Question 10

A method of sequencing amino acids in a peptide.

Answer 10

Edman Degradation by Pehr Edman

Question 11

Glass spheres are fluidised by water at a velocity equal to one half of their terminal falling velocities. Calculate:
(a) voidage
(b) the density of the fluidised bed,
(c) the pressure gradient in the bed attributable to the presence of the particles.
The particles are 2 mm in diameter and have a density of 2500 kg/m3. The density and viscosity of water are 1000 kg/m3 and 1 mNs/m2 respectively.

Answer 11

a. e = 0.755
b. The bed density is 1367 kg/m3.
c. The pressure gradient 3605 (N/m2)/m