1A mixture of sand and common salt could be separated by
2What structure links the mouth to the stomach
3Which of the following organisms causes bilharziasis?
4Which of the following processes is a chemical change?
5An atom has 5 protons and 5 neutrons in its nucleus. How many electrons are present in the atom?
6Which of the following features in plants are used for defence?
7The ability of birds to fly depends on
8Gases are more compressible than solids because:
9Which of the following statements about machines is/are true ?
10Which of the following substances reacts with ammonium chloride to produce ammonia gas?
11Plastic materials may be used to make the handles of cooking utensils because they are
12Which of the following substances will turn red litmus paper blue?
13The heat of the sun reaches the earth through
14The mineral salts in dead organisms become available to the soil through
15A ray of light is incident at an angle of 30° to the surface of a plane mirror. Calculate the angle of reflection.
16Salt could be obtained from sea water by
17A fertilised ovum is known as
18The smallest planet known in the solar system is
19The organic constituent of the soil is
20A car head lamp lights up when connected to a battery. What type of energy is obtained from the battery?
21Which of the following statements about bacteria is true ?
22Which of the following organisms is a parasite on plants?
23The main parts of the central nervous system are the
24Which of the following pairs of diseases can be spread easily when food is exposed to houseflies?
25Which of the following activities is a mode of transmission of AIDS?
26The eclipse of the moon occurs when the
27Spitting in public is a bad social habit because it
28The male sex cells in the flower are found in the
29Which of the following substances is a pollutant?
30Digestion of protein starts in the
31The sun, the heavenly bodies and the planets form the
32Which of the following practices encourages soil erosion?
33Which of the following metals is an alloy?
34Which of the following statements about plants is true ?
35Which of the following practices will destroy the breeding grounds of mosquitoes?
36A plastic pen on rubbing in the hair attracts pieces of paper. What force is responsible for the attraction?
37When carbon dioxide is passed through lime water
38Which of the following solids melts easily on exposure to sunlight?
39Which of the following structures regulate the amount of light that enters the eye?
40Leguminous crops such as beans are cultivated to
