Q. In the process of dialysis, the phenomenon involved is -
1) Diffusion
2) Absorption
3) Osmosis
4) Electrophoresis
Q. The filament of an electric lamp becomes white-hot but the lead-in wires holding the filament are only slightly heated because they -
1) Have smaller currents passing through them
2) Have very low resistance
3) Have a higher melting point
4) are made of black iron
Q. Hot coffee is poured simultaneously in four metallic tumblers Painted outside with different types of paints. After some time, the coffee will be found coldest in the tumbler-painted -
1) Rough white
2) Shining white
3) Rough black
4) Shining black
Q. Food cans are coated with Tin instead of Zinc, because -
1) Zinc is more expensive than Tin
2) The melting point of Zinc is higher than Tin
3) Zinc is more reactive than Tin
4) Zinc is less reactive than Tin
Q. In an ecosystem, the flow of energy declines as it passes from lower to higher trophic levels. This is explained by the following -
1) First law of thermodynamics
2) Second law of thermodynamics
3) Newton's second law
4) Newton's third law
Q. Which one of the following is the highest reactive metal?
1) Sodium
2) Potassium
3) Calcium
4) Iron
Q. The half-life of a radioactive substance is 4 months. How much time it will take to decay 3/4th of the substance?
1) 12 months
2) 8 months
3) 4 months
4) 3 months
Q. The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?
1) Ice is a bad conductor of heat
2) Since the surface of the lake is at the same temperature as the air, no heat is lost
3) The density of water is at its maximum at 4°C
4) None
Q. A rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?
1. Dispersion
2. Refraction
3. Internal reflection
Select the correct solution using the codes given below -
1) Only 1 and 2
2) Only 2 and 3
3) Only 1 and 3
4) 1, 2 and 3
Q. Which of the following substances has the highest refraction index with respect to air or vacuum?
1) Crown glass
2) Ruby
3) Saphire
4) Diamond
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