Q. Birds which swim in water have -
1) Broad wings
2) Long beaks
3) Toes with claws
4) Webbed feet
Q. A balloon filled with helium rises in air because--
1) Helium pushes down on the air below the balloon
2) The balloon is weightless
3) Air exerts an upward force on the balloon
4) Helium is less dense than air
Q. One can distinguish a telescope from a microscope by observing -
1) Colour
2) Length and size of the lens
3) Size of the lens
4) Length
Q. The sound produced by a bat is -
1) Ultrasonic
2) Infrasonic
3) Audible
4) Subsonic
Q. When a bar magnet is cut into two equal halves, the pole strength of each piece -
1) Becomes zero
2) Remains the same
3) Becomes Half
4) Becomes Double
Q. Cooking oil is converted into vegetable ghee by the process of -
1) Crystallisation
2) Oxidation
3) Condensation
4) Hydrogenation
Q. Rusting of iron requires -
1) Oxygen only
2) Oxygen and Carbon dioxide
3) Oxygen and water
4) Carbon dioxide only
Q. Uranium eventually decays into a stable isotope of--
1) Lead
2) Polonium
3) Thorium
4) Radium
Q. Which of the toxic heavy metals is found in modern tannery industries?
1) Nickel
2) Zinc
3) Chromium
4) Lead
Q. Which of the following contains high content of lead?
1) Low octane fuel
2) High octane fuel
3) Cooking gas
4) Coal
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