Mixed Practice

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Showing 2901 to 2925 of 3046 questions (page 117 of 122).

2901. A nucleophile is a species that

A. donates an electron pair to an electron deficient centre B. accepts an electron pair C. has no lone pair D. always carries a positive charge E. accepts a proton only

2902. Acid catalysed hydration of an alkene gives

A. an aldehyde B. an alcohol C. an alkane D. an ether E. a carboxylic acid

2903. Sulphonation of benzene is carried out using

A. nitric acid alone B. sodium hydroxide C. dilute hydrochloric acid D. aluminium chloride E. concentrated or fuming sulphuric acid

2904. Oxidation of a secondary alcohol gives

A. a ketone B. an aldehyde C. an alkene D. a carboxylic acid E. an ester

2905. Aliphatic amines are more basic than ammonia because the alkyl groups are

A. acidic B. electron releasing and increase the availability of the lone pair C. unable to donate electrons D. aromatic E. electron withdrawing

2906. The sequence of amino acids in a polypeptide chain constitutes the

A. active site only B. secondary structure C. quaternary structure D. tertiary structure E. primary structure of the protein

2907. The monomer of natural rubber is

A. isoprene B. vinyl chloride C. ethene D. butadiene E. styrene

2908. A thermosetting plastic differs from a thermoplastic in that it

A. is always transparent B. softens repeatedly on heating C. conducts electricity D. sets permanently on heating because of cross linking E. dissolves in water

2909. Lipids are hydrolysed by alkali to give glycerol and

A. alcohols only B. nucleotides C. salts of fatty acids D. monosaccharides E. amino acids

2910. Ozone depletion is most severe over

A. the Sahara B. the equator C. the Pacific Ocean D. northern Europe E. Antarctica

2911. Solid waste disposal by sanitary landfill requires lining of the site chiefly to

A. improve appearance B. speed up decay C. prevent leachate from contaminating groundwater D. allow gas to escape E. increase the temperature

2912. The SI prefix representing a factor of 10^-12 is

A. nano B. pico C. femto D. milli E. micro

2913. The supplementary SI unit of solid angle is the

A. hertz B. radian C. steradian D. degree E. gradian

2914. When two quantities are divided, the percentage uncertainties are

A. squared B. subtracted C. multiplied D. added E. divided

2915. An angle of 90 degrees expressed in radians is

A. pi B. pi/4 C. pi/3 D. 2 pi E. pi/2

2916. Vectors are added graphically by the

A. perpendicular axis rule B. head to tail rule C. right hand rule D. parallel axis rule E. inverse square rule

2917. Subtracting vector B from vector A is equivalent to adding

A. B to A B. zero to A C. the magnitude of B to A D. twice B to A E. the negative of B to A

2918. The direction of the resultant of two perpendicular components Ax and Ay is given by

A. tan theta equals Ax divided by Ay B. tan theta equals Ay divided by Ax C. theta equals Ax plus Ay D. sin theta equals Ax divided by Ay E. cos theta equals Ay divided by Ax

2919. The moment of a couple equals the magnitude of one force multiplied by

A. the sum of the two forces B. zero C. the distance from the axis to one force D. the perpendicular distance between the two forces E. the length of the body

2920. Three forces acting at a point are in equilibrium. They can be represented in magnitude and direction by

A. the three sides of a closed triangle taken in order B. a single vector C. three concurrent rays D. three parallel lines E. two perpendicular vectors

2921. The slope of a velocity time graph gives

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

2922. A person standing in a lift whose cable has snapped and which falls freely experiences an apparent weight of

A. zero B. mg/2 C. m(g plus a) D. 2mg E. mg

2923. For a given pair of surfaces, the limiting static friction is generally

A. independent of the normal force B. equal to the kinetic friction C. zero D. smaller than the kinetic friction E. greater than the kinetic friction

2924. A car moving at 20 m s-1 is brought to rest in 50 m. Its uniform retardation is

A. 0.4 m s-2 B. 2 m s-2 C. 10 m s-2 D. 4 m s-2 E. 8 m s-2

2925. A body moves 4 m east then 3 m north. The magnitude of its displacement is

A. 7 m B. 5 m C. 12 m D. 1 m E. 3.5 m

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