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
Q. Ohm's law gives a relationship between -
1) Current and resistance
2) Resistance and potential difference
3) Potential difference and electric charge
4) Current and potential difference
Q. When a crystal of potassium permagnet is placed at the bottom of a beaker, filled with water, the whole water turns into purple without stirring. This is an example of -
1) Diffusion
2) Distribution
3) Effusion
4) Intrusion
Q. During summer days, water kept in an earthen pot (pitcher) becomes cool because of -
1) Osmosis
2) Evaporation
3) Diffusion
4) Transpiration
Q. Which of the following is/are physical changes?
I. Condensation of steam
II. Burning of charcoal
III. Making a fruit salad from raw fruits
IV. Melting of wax Correct code is -
1) Only I, and II
2) Only III, and IV
3) Only I, III, and IV
4) All I, II, III, IV
Q. Which of the following is/ are examples of doing work against gravity?
1) Lifting a baby from the floor
2) Lifting the weights by weightlifter
3) Moving of the electric elivator with 4 men, upward
4) All of the above
Q. Which keeps the earth in a uniform circular motion around the sun?
1) The gravitational force between the sun and the moon
2) The gravitational force between the sun and the earth
3) The gravitational force between the Earth and the Mars
4) None of the above
Q. The bandwidth required for commercial telephonic communication (speech signals) is -
1) 300 MHz
2) 30 kHz
3) 4.2 MHz
4) 2800 Hz
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