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2376. At its isoelectric point, an amino acid exists mainly as

A. an anion B. a neutral unionized molecule C. a zwitterion D. a free radical E. a cation

2377. The linkage joining amino acid residues in a protein is

A. a glycosidic bond B. an ester linkage C. an ionic bond D. a peptide bond E. a disulphide bond only

2378. Nylon 6,6 is an example of

A. a condensation polymer B. an addition polymer C. an elastomer formed by vulcanization D. a silicone E. a natural polymer

2379. Which of the following is a reducing sugar?

A. glycogen B. sucrose C. starch D. cellulose E. glucose

2380. The percentage of nitrogen in urea is about

A. 21% B. 60% C. 46% D. 35% E. 82%

2381. Depletion of stratospheric ozone is mainly caused by

A. sulphur dioxide B. chlorofluorocarbons C. nitrogen gas D. methane E. carbon dioxide

2382. Acid rain is caused mainly by the oxides of

A. carbon and hydrogen B. sulphur and nitrogen C. silicon and boron D. sodium and potassium E. iron and copper

2383. The chief greenhouse gas responsible for the enhanced greenhouse effect is

A. helium B. argon C. oxygen D. carbon dioxide E. nitrogen

2384. The stationary phase in thin layer chromatography is usually

A. silica gel or alumina B. the mobile solvent C. the sample itself D. water only E. air

2385. Which quantity has the same dimensions as work?

A. power B. force C. torque D. impulse E. pressure

2386. The number of significant figures in 1.230 x 10^4 is

A. 6 B. 4 C. 2 D. 3 E. 5

2387. The sum of 2.50 cm and 1.6 cm, expressed to the correct number of decimal places, is

A. 4 cm B. 4.100 cm C. 4.10 cm D. 4.16 cm E. 4.1 cm

2388. One radian is approximately equal to

A. 6.28 degrees B. 1 degree C. 3.14 degrees D. 57.3 degrees E. 180 degrees

2389. Two vectors of magnitudes 3 and 4 units give a resultant of 7 units. The angle between them is

A. 90 degrees B. 0 degrees C. 45 degrees D. 180 degrees E. 120 degrees

2390. The cross product of a vector with itself is

A. undefined B. twice the vector C. the null vector D. its magnitude squared E. a unit vector

2391. The magnitude of the cross product of two vectors of magnitudes 2 and 3 units with 30 degrees between them is

A. 3 C. 5.2 D. 6 E. 1.5

2392. A force of 5 N acts perpendicular to a spanner at a distance of 0.2 m from the pivot. The torque produced is

A. 10 N m B. 5 N m C. 0.04 N m D. 1 N m E. 25 N m

2393. The projection of vector A along vector B is given by

A. A x B B. A.B C. A.B / |B| D. A.B / |A| E. |A| |B|

2394. A couple consists of

A. two equal and opposite parallel forces not acting along the same line B. three concurrent forces C. two equal forces in the same direction D. a single force through the centre of mass E. two unequal opposite forces

2395. The area under a velocity time graph represents

A. force B. displacement C. acceleration D. momentum E. power

2396. A ball is thrown vertically upwards with 19.6 m s-1. The maximum height reached is

A. 9.8 m B. 39.2 m C. 29.4 m D. 19.6 m E. 4.9 m

2397. A stone is dropped from rest and falls 45 m. The time taken is about

A. 1.5 s B. 9.0 s C. 3.0 s D. 2.1 s E. 4.5 s

2398. The slope of a momentum time graph gives

A. velocity B. power C. impulse D. force E. kinetic energy

2399. When a bomb at rest explodes into two unequal fragments, the two fragments have

A. equal kinetic energies B. equal masses C. equal speeds D. zero total kinetic energy E. equal and opposite momenta

2400. The coefficient of restitution for a perfectly elastic collision is

A. 1 B. 0.5 C. greater than 1 D. between 0 and 1 but never 1

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