Q. The specific latent heat of vaporization of a substance is the quantity of heat needed to change unit mass from -
1) liquid to vapour with a change in temperature
2) liquid to vapour without a change in temperature
3) vapour to liquid without a change in temperature
4) vapour to liquid with a change of temperature
Q. What is the mass of a material, whose specific heat capacity is 400 J/(kg °C) for a rise in temperature from 15°C to 25°C, when heat received is 20 kJ?
1) 0.1 kg
2) 1 kg
3) 10 kg
4) 5kg
Q. Which one among the following is not a unit of measurement of surface ozone?
1) Microgram per meter cube
2) Nanogram per meter cube
3) Dobson unit
4) Parts per million
Q. The acceleration due to gravity at the Earth's surface depends on -
1) it is mass only
2) its radius only
3) both its mass and radius
4) either it is mass or its radius
Q. When water is heated from 0°C to 4°C, its density -
1) remains constant
2) increases
3) decreases
4) first increases then decreases to its original value
Q. Which one of the following statements about the aperture of a convex lens is correct?
1) It is equal to its radius of curvature
2) It is equal to its focal length
3) It is independent of its radius of curvature
4) It is equal to half of its focal length
Q. If an object is placed at the focus of a convex lens, its image is -
1) at the focus on the same side
2) at the focus on the opposite side
3) coincident with the lens
4) at infinity
Q. An object is dropped from a height onto the floor. Which one of the following remains uniform as it falls?
1) Its acceleration
2) Its momentum
3) Its kinetic energy
4) Its potential energy
Q. In the joining of railway tracks, iron oxide is made to react with -
1) Aluminium
2) Zinc
3) Copper
4) Tin
Q. A metal wire of length l and diameter d has a resistance R. What would be the resistance of another wire of the same metal and of the same length but having double the diameter?
1) R
2) R/4
3) R/2
4) 2R
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