TV transmission cannot cover a very large area because
(A) the strength of T.V. waves is very limited
(B) picture cannot be transmitted clearly after a specific distance
(C) the shape of the earth is spherical
(D) the air is not a good conductor of light and sound/waves
The cow’s milk contains how much amount of water in terms of percentage
(A) 60%
(B) 65%
(C) 72%
(D) 80%
Most of the ozone in the atmosphere is concentrated in the _____________
(A) Mesosphere
(B) Troposphere
(C) Stratosphere
(D) ionosphere
An iceberg is floating in sea How much of its mass will remain above the surface of water
(A) One tenth
(B) One fifth
(C) One fourth
(D) One third
An astronaut inside a spacecraft is in a state of weightlessness This implies that
(A) The mass of the astronaut is reduced to zero
(B) Gravity inside the spacecraft ceases to act
(C) The astronaut is outside the influence of the earth’s gravitational force
(D) The astronaut and the spacecraft are both in a free-failing state
The absorption of ink by blotting paper involves__________
(A) Viscosity of ink
(B) Capillary action phenomenon
(C) Diffusion of ink through the blotting
(D) Siphon action
Detergents dissolved in water help in cleaning clothes by_________
(A) Increasing the temperature of water
(B) Reacting chemically with dirt
(C) Reducing the surface tension of water
(D) Dissolving dirt
The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________
(A) The hair barging against the charged comb
(B) Small electric sparks
(C) The rubbing of the comb with the hair
(D) None of the above
In order to prevent the corrosion of iron pipes they are often coated with a layer of zinc This process is termed as____________
(A) Electroplating
(B) Annealing
(C) Galvanization
(D) Vulcanization
Scalding with steam is more severe than scalding by boiling water because_______
(A) Steam can penetrate the skin
(B) Steam is at a higher temperature
(C) Steam contains more energy than boiling water
(D) Steam is at a higher pressure