Q. Liquid water is denser than ice due to -
1) Oxygen Bonding
2) Hydrogen Bonding
3) Carbon Bonding
4) Temperature
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 maximum at 40C
4) None of the statements (A), (B) and (C) given above is correct
Q. 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) 1 and 2 only
2) 2 and 3 only
3) 1 and 3 only
4) 1, 2 and 3
Q. Newton's first law of motion is known as -
1) Gravity
2) Law of Inertia
3) Law of conservation of momentum
4) Vertical motion
Q. Milarite is the ore of -
1) Copper
2) Iron
3) Nickel
4) Zink
Q. Black-hole is -
1) a flight recorder in aeroplane
2) a spot on the sun
3) a place in Antarctica
4) a collapsed star
Q. Which one of the following is associated with 'Albedo'?
1) Transmitting power
2) Absorbing power
3) Emissive power
4) Reflecting power
Q. The phenomenon used in optical fibre for transmission of light energy is -
1) Total internal reflection
2) Diffraction
3) Scattering
4) Refraction
Q. A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by -
1) Conduction
2) Convection and radiation
3) Both (A) and (B)
4) None of the above
Q. The unit of electric power is -
1) ampere
2) volt
3) coulomb
4) watt
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