(Download) Special Class Railway Apprentices (SCRA) Practice Paper (SET - 2) : Physical Science

Special Class Railway Apprentices (SCRA)
Practice Paper (SET - 2)

Physical Science

A fatty acid is first warmed with sodium bisulphate and then treated with sodium nitroprusside solution when a greenish­blue colour is produced. The fatty acid is
(a) acetic acid. (b) formic acid.
(c) propionic acid. (d) None of these.

Which of the following acids is present in lemon juice ?
(a) Citric acid (b) Benzoic acid
(c) Tartaric acid (d) Oxalic acid.

The acid present in the stings of bees and wasps is
(a) acetic acid. (b) formic acid.
(c) formalin. (d) formaldehyde.

A primary amine can be distinguished from secondary and tertiary amines by
(a) reaction with methyl iodide.
(b) reaction with acetyl chloride.
(c) carbylamine reaction.
(d) None of these.

The acid manufactured from cellulose is
(a) citric acid.
(b) oxalic acid.
(c) Both (a) and (b).
(d) None of these.

Which of the following statements is incorrect about esters ?
(a) They are colourless liquids with pleasant fruity odours.
(b) They are prepared by refluxing an alcohol with anhydrous acid in the presence of concentrated sulphuric acid.
(c) They are hydrolysed on refluxing with dilute alkali in a reaction known as saponification.
(d) They form amines with ammonia.

Which of the following statments is not true about acetamide ?
(a) It is a white crystalline solid, soluble in water.
(b) It can be prepared by slow dehydration of the ammonium salt of ethanic acid.
(c) It is dehydrated by phosphorus pentoxide to form a nitrile.
(d) It reacts with bromine water and warm alkali to form a tertiary amine.

Chlorobenzene gives D.D.T. when it reacts with
(a) chloral. (b) phenol.
(c) naphthalene. (d) benzoic acid.

Chlorobenzene gives phenol when heated with
(a) water. (b) alcohol.
(c) caustic soda. (d) All of these.

Chlorobenzene when heated with chloral and conc. sulphuric acid yields
(a) phenol. (b) benzoic acid.
(c) polythene. (d) D.D.T.

The compounds prepared by Sandmeyer reactions are
(a) phenols.
(b) diazo compounds.
(c) halo compounds.
(d) nitro compounds.