Basic Physics Online Test
Which combination of colours is the most convenient during day and night time?
White and black combination of colours is the most convenient during day and night time. Black text on a white background is best, since the colour properties and light are best suited for the human eye. That's because white reflects every wavelength in the colour spectrum.
Amount of water vapour in the atmosphere is measured in terms of:
Humidity is a measure of the amount of water vapour in the air. Relative humidity measures the amount of water in the air in relation to the maximum amount of water vapour (moisture). The higher the temperature, the more water vapour the air can hold.
In the atmosphere, ultraviolet rays are absorbed by:
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere.
In which of the following cryogenic engines are used?
A cryogenic rocket engine is a rocket engine that uses a cryogenic fuel and oxidizer; that is, both its fuel and oxidizer are gases which have been liquefied and are stored at very low temperatures.
Plimsoll line is a reference mark in a:
The Plimsoll line is a reference mark located on a ship's hull that indicates the maximum depth to which the vessel may be safely immersed when loaded with cargo.
If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will:
Due to inertia of motion, as long as the ball stays in the air, both the boy and the ball move in the same direction which cause the ball falls into his hand.
When pressure is increased the melting point of ice:
The melting point increases with an increase in pressure except for ice. The melting point of ice decreases when pressure increases. This strange behaviour of the ice is observed because water expands when it freezes i.e. ice occupies more volume than liquid water.
'Short-sight' in human eye can be corrected by using proper:
A concave lens is used to correct short-sightedness (myopia). A short-sighted person's focus is focusing before the back of the eyeball. The concave lens pushes the rays of light further apart so that they arrive together in proper focus at the back of the eye.
What is viewed through an electron microscope?
Electron microscopes are used to investigate the ultrastructure of a wide range of biological and inorganic specimens including microorganisms, cells, large molecules, structure of bacteria and viruses, etc.
A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle?
If an object moving forward in a straight line is affected by gravity it will fall in a parabolic arc. Since projectiles are objects affected only by gravity, the path of a projectile moving forward from the momentum of an initial thrust is parabolic.
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