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Showing 701 to 725 of 3046 questions (page 29 of 122).

701. Fehling's solution is reduced by aldehydes to give a precipitate of

A. silver B. copper(I) oxide C. copper metal D. copper(II) hydroxide E. cuprous chloride

702. Reduction of a ketone with sodium borohydride gives

A. a primary alcohol B. a secondary alcohol C. a tertiary alcohol D. an aldehyde E. an alkane

703. Soap is manufactured by the alkaline hydrolysis of fats, a process called

A. esterification B. saponification C. hydrogenation D. polymerization E. cracking

704. Aspirin is chemically

A. salicylic acid B. acetylsalicylic acid C. benzoic acid D. phenol E. methyl salicylate

705. The monomer of polyvinyl chloride is

A. ethene B. vinyl chloride C. styrene D. propene E. chloroform

706. Vulcanization of rubber involves heating it with

A. sulphur B. carbon C. nitrogen D. chlorine E. phosphorus

707. The building blocks of nucleic acids are

A. amino acids B. nucleotides C. monosaccharides D. fatty acids E. glycerols

708. Vitamins B and C are described as water soluble because they

A. contain long hydrocarbon chains B. contain several polar hydroxyl and amino groups C. are stored in fat tissue D. are proteins E. are minerals

709. The specificity of an enzyme is explained by the

A. collision theory B. lock and key model of the active site C. kinetic theory D. resonance theory E. band theory

710. Cracking of heavy petroleum fractions is carried out to

A. increase the molar mass B. obtain lighter and more useful hydrocarbons C. remove sulphur only D. form aromatics only E. increase the boiling point

711. The octane number of a fuel measures its

A. energy content B. resistance to knocking C. sulphur content D. density E. volatility

712. Biochemical oxygen demand is a measure of

A. the oxygen required by micro-organisms to decompose organic matter in water B. the total dissolved solids C. the acidity of water D. the hardness of water E. the chlorine content

713. Primary treatment of waste water consists mainly of

A. biological oxidation B. physical removal of suspended solids by screening and sedimentation C. chlorination D. reverse osmosis E. ion exchange

714. Photochemical smog is formed mainly from

A. sulphur dioxide and soot B. nitrogen oxides and unburnt hydrocarbons in sunlight C. carbon dioxide and water D. chlorofluorocarbons E. ammonia and dust

715. Two components can be separated by chromatography because they differ in

A. molar mass only B. their relative affinity for the stationary and mobile phases C. colour D. density E. melting point

716. How many base units are defined in the International System of Units (SI)?

A. 5 B. 8 C. 9 D. 7 E. 6

717. The dimensions of Planck's constant are the same as those of

A. angular momentum B. energy C. force D. power E. linear momentum

718. A screw gauge has a pitch of 0.5 mm and 50 divisions on its circular scale. Its least count is

A. 0.5 mm B. 0.01 mm C. 0.001 mm D. 0.025 mm E. 0.05 mm

719. Which of the following is a supplementary unit in SI?

A. mole B. joule C. kelvin D. newton E. radian

720. The dimensional formula of pressure is

A. [MLT-2] B. [ML-3T0] C. [ML-1T-2] D. [ML-2T-2] E. [ML2T-2]

721. If a quantity is measured as 4.0 cm with an absolute uncertainty of 0.1 cm, the percentage uncertainty is

A. 0.25% B. 0.4% C. 25% D. 2.5% E. 4%

722. A dimensionally correct equation

A. always contains a trigonometric term B. may still be physically incorrect C. is always physically correct D. cannot contain constants E. must be numerically correct

723. A unit vector perpendicular to the plane containing vectors A and B is given by

A. (A x B)/|A x B| B. A - B C. A + B D. (A.B)/|A||B| E. A.B

724. The value of i . (j x k) is

A. -1 B. i C. j E. 1

725. Two forces of 10 N each act on a body with an angle of 120 degrees between them. The magnitude of the resultant is

A. 17.3 N B. 20 N C. 0 N D. 14.1 N E. 10 N

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