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What is the average adult pulse rate?
The beautiful color patterns exhibited by a peacock in its tail feathers are due to ?
A. Selective absorption of light
B. Selective re ection of light
C. Interference of light
D. Natural colour pattern of feathers
A lake starts freezing because of the cold atmosphere. It will first freez
A. At the bottom
B. ln the middle pan
C. At the top surface
D. Uniformly throughout the water body
The sun appears red at sunrise and sunset while it appears white at noon, because
A. Of refraction
B. It is cooler at sunrise and at sunset
C. Of diffraction leading to the red end of the spectrum reaching the earth.
D. Of Scattering of light due to dust particles and air molecules.
An astronaut inside a spacecraft is in a state of weightlessness. This imply 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
An iceberg is floating in the 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
Most of the ozone in the atmosphere is concentrated in the _____________?
T.V. 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 GreenHouse Effect is caused by an excess of ?
A. Carbon dioxide
B. Carbon monoxide
C. Carbon tetrachloride
D. None of the above
Bats can also fly in the dark because they are capable of taking the help of _________?
A. Ultraviolet Waves
B. Ultrasonic Waves
C. Electromagnetic Waves
D. Special Retina
Most of the ozone in the atmosphere is concentrated in the, T.V. transmission cannot cover a very large area because, The GreenHouse Effect is caused by an excess of ?, What is the average adult pulse rate?