A specimen of a fish was given to students to identify the
externally visible chordate feature in it. The students would look for: (1) Operculum
(2) Notochord
(3) Dorsal tubular Nerve cord
(4) Post anal tail
A Student mixed some acetic acid with water. He would
have observed the solution formed as: (1) Green and transparent
(2) Pink and opaque
(3) Yellow and transparent
(4) Colourless and transparent
A Student take some zinc granules in a test tube and adds
dilute hydrochloric acid to it. He would observe that the colour of the zinc
granules changes to : (1) white
(2) black
(3) brown
(4) Yellow