Q. Which of the colours of visible light has minimum frequency?
1) Violet
2) Red
3) Yellow
4) Green
Q. Which of the following is one of the main causes of tides?
1) Gravitational pull of the Sun and the Moon
2) Closed orbits of planets
3) Rotation of Earth
4) Solar flares
Q. A circular metal piece with a hole in the centre is heated. The size of the hole will -
1) Increase
2) Decrease
3) Remains of the same size
4) Depends on the metal
Q. Which of the following is a physical change?
1) Oxidation
2) Decomposition
3) Sublimation
4) Reduction
Q. Low ionization energy is a characteristic of -
1) Inert gas
2) Metalloids
3) None-metal
4) Metal
Q. Light energy is converted into chemical energy by -
1) Electrolysis
2) Respiration
3) Transpiration
4) Photosynthesis
Q. Oil spreads over the surface of the water because -
1) Oil is denser than water
2) Water is denser than oil
3) Oil has higher surface tension than water
4) Oil has less surface tension than water
Q. Which of the following is the most elastic?
1) Steel
2) Rubber
3) Silver
4) Glass
Q. A rolling ball stops after a certain distance. Why does it stop?
1) Due to Coulomb forces
2) Due to gravitational forces
3) Due to frictional forces
4) None of the above
Q. Which type of mirror is used in automobiles to see the traffic on the rear side?
1) Convex mirror
2) Concave mirror
3) Plane mirror
4) None of the above
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