Q. All of the following are examples of chemical changes except the -
1) magnetizing of iron
2) rusting of iron
3) digestion of food
4) souring of milk
Q. The isotopes of an element contain the same number of -
1) neutrons and protons
2) protons but different number of neutrons
3) neutrons and protons but different number f electrons
4) neutrons and electrons but different number of protons
Q. Pressure cooker cooks rice faster because -
1) it always lets the steam escape
2) high pressure crushes the hard covering of rice grains
3) it does not let the heat energy escape easily
4) high pressure raises the boiling point of water
Q. Which of the following is a physical change?
1) Oxidation
2) Reduction
3) Decomposition
4) Sublimation
Q. If the speed of rotation of the earth increases, the weight of the body -
1) increases
2) remains unchanged
3) decreases
4) may decrease or increase
Q. The free surface of a liquid behaves like a sheet and tends to contract to the smallest possible area due to the -
1) Force of adhesion
2) Force of friction
3) Centrifugal force
4) Force of cohesion
Q. The steel of more elastic than rubber because -
1) its density is high
2) it is a metal
3) the ratio of stress to strain is more
4) the ratio of stress to strain is less
Q. A transistor is most likely to be found in a -
1) Fuse
2) Fluorescent lamp
3) Hearing aid
4) Wristwatch
Q. Radioactive substances can be produced readily in -
1) an electron gun
2) an atomic pile
3) a transistor
4) a Wilson cloud chamber
Q. The volume of which of the following materials decreases when it is heated from 0° C to 5° C?
1) Air
2) Copper
3) Water
4) Mercury
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