-
- Differential scattering of sunlight by the atmosphere
- Total internal reflection of the sunlight by the atmosphere
- Absorption of sunlight
- Refraction of sunlight by the atmosphere
The spherical shape of a small drop of rain is due to _____.
-
- Viscosity
- Surface tension
- Atmospheric pressure
- Gravity
Which of the following devices is used to step up or step down the voltage of alternating current?
-
- Induction coil
- Transformer
- Transistor
- Rectifier
The advantage of AC over DC is that _____.
-
- it contains more electrically energy
- it is free from voltage fluctuations
- its generation costs much less
- it can be transmitted over long distances with minimum power loss
Sun and the othe rstars are virtually huge nuclear explosion chambers producing a large amount of heat and light. Yet, we do not hear any of the explosions because _____.
-
- beat and light are electromagnetic radiations and travel much faster than sound.
- sound waves get attenuated completely before they reach the earth.
- the process involved in the interior of the sun and the stars relate to atomic and subatomic particles and not molecules an their vibrations.
- the outer space is an absolute vacuum.
What are primary colors?
-
- Color of the rainbow
- Color in the spectrum of white light
- Colors which cannot be produced
- Color found in nature
Who is called the ‘Father of Medicines’?
-
- Aristotle
- Socrates
- Hippocratic
- Pluto
The shortest day of each year in Northern Hemisphere is _____.
-
- 18th November
- 23rd September
- 22nd December
- 14th August
The longest day of each year in Northern Hemisphere is _____.
-
- 15th May
- 21st June
- 20th March
- 17th July
Cryptography is a branch of science which deals with _____.
-
- Crimes
- Secret writing
- Old things
- Dictionary
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