PRACTICAL SKILL PAPER IN SCIENCE AND TECHNOLOGY 2007 

Time Allowed: 1 hr 30 min Maximum Marks: 20

SECTION A

1) When the stopper of a bottle containing a colourless liquid was removed, the bottle gave out a smell like that of vinegar. The liquid in the bottle could be

(a) hydrochloric acid
(b) sodium hydroxide
(c) acetic acid
(d) saturated sodium bicarbonate solution

2) Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained will be

(a) green
(b) red
(c) blue
(d) brown

3) Sulphur dioxide gas is collected in the laboratory by the

(a) upward displacement of air
(b) downward displacement of air
(c) upward displacement of water
(d) downward displacement of water

4) A liquid sample turned red litmus paper blue. This indicates that the liquid sample is that of

(a) an alcohol
(b) distilled water
(c) sodium hydroxide solution
(d) hydrochloric acid

5) Which one of the following will be required to identify the gas evolved when dilute hydrochloric acid reacts with zinc metal

(a) blue litmus solution
(b) red litmus solution
(c) a burning splinter
(d) lime water

6) the correct method of finding the pH of a solution is to

(a) heat the solution in a test tube and expose the pH paper to the vapours formed.
(b) pour few drops of the solution from the test tube on the pH paper.
(c) Drop the pH paper in the solution.
(d) Put a drop of the solution on the pH paper using a dropper.

7) A little dilute hydrochloric acid is dropped on a pH paper. The colour of the pH paper turns to

(a) dark pink
(b) light green
(c) light blue
(d) bright yellow

8) An ammeter has 20 divisions between mark 0 and mark 2 on its scale. The least count of the ammeter is

(a) 0.02 A
(b) 0.01 A
(c) 0.2 A
(d) 0.1 A

9) A student obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, he will have to shift the mirror

(a) towards the screen.
(b) away from the screen.
(c) either towards or away from the screen depending upon the position of the object.
(d) To a position very far away from the screen.

10) A sharp image of a distant object is bound on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the

(a) lens and the object.
(b) Lens and the screen.
(c) Object and the screen.
(d) Lens and the screen and also object and the screen.