• Portable gadgets = Mobile phones and portable TVs.
• Derailleur gears are used in Bicycles.
• Motor – cross race is for motor cycles.
• Cantilever brake used in Bicycle.
• Speed of light 300,000 kilometers per second.
• Engineers use electronic theodolite and range-finder to measure the distance and angle to calibrated staff.
• Centigrade and Celsius temperatures are same below freezing point.
• which instrument is used to measure pressure? Manometer
• the velocity of light was first measured by Olaf Roemer
• centigrade and fahrenheit scales gives same readings at 32 degrees
• The first European scientist who refuted the belief that the earth was the centre of the universe was Copernicus.
• Mobile phones transmit message using radio-type waves called microwaves
• Super conductors are also strong diamagnetic this means they strongly repel magnets.
• Super conductors are used in very fast computers and also in trains like Maglevs.
• Electronic theodolite and range finder measures and distance and angle.
• A fluorescent light is a glass tube containing gas which produces UV light when current passed trough it. Tube is coated with phosphor which glows when UV hits it.
• Some of the chemicals from the recycle of old cells are used by liver to make bile which is stored in gall bladder.
• Which is lighter, gold or plastic? Plastic
• Lasers are a special source of light called coherent light this means all the light waves are in step with each other and travel in same direction
• Laser produce light of one particular wavelength and it is s single, pure color.
• The first hologram was make in 1962
• Laser = Light Amplification by Stimulated Emission of Radiation
• Quartz-halogen bulbs are used in overhead projectors and spotlights
• Helium is uses to fill airships and balloons
• Helium is used to pressurize hydrogen fuel in rockets and the air in diver’s air tanks
• Apart from radon, which is radioactive, the noble gases are used in lighting.
• The noble gases have very low boiling points.
• Liquid helium is the coldest substance.
• A gas only becomes liquid at -268.9 deg: C
• Combustion is a kind of oxidation reaction.
• At room temperature the particles in air travel at around 1800 km/h the same speed as a bullet fires from a rifle.
• Generators convert mechanical energy into electrical energy.
• The principle behind the generator is electromagnetic induction. It was discovered by Michael Faraday.
• Lovell telescope is at Jodrell Bank the site for space observatory
• Nicolous Copernicus (1473-1543) was born in Poland and was the first to explain the solar system.
• Derailleur gear are used in bicycles
• Cantilever brake is also used in bicycles
• Static electricity makes a balloon stick to the wall after you have rubbed it on your hair.
• John Bardeen, Walter Brattain and William Shockley in 1947 used a semiconductor called germanium to make the world’s first transistor.
• A diode conducts electricity easily in one direction but resists the flow of electricity in the other.
• A capacitor stores electric charge. Capacitors are important components for making timers.
• Capacitors are used in filtering circuits like treble and bass in hi-fi
• Transistors can be used as logic gates
• Energy value of food items is expressed in kilojoules (kj) or thousands of joules.
• British scientist James Prescott Joule discovered the principle of conservation of energy.
• Which one of the following statements regarding sound is true? Its source is always a vibrating material.
• Weight of an object put in a satellite orbiting in space around the earth is reduced to zero
• Movie camera take pictures at rate of 24 pictures per second
• Density of water is 1
• Water expands as it freezes to ice. This makes ice less dense than water which causes ice to float.
• Heat flows in three ways conduction, convection and radiation
• A concave lens is used for the correction of the Hyperphobia
• Silver metal has the highest electrical conductivity.
• Mohr’s scale hardest substance is diamond – what’s the softest: Talc
• Ambati Balamyrali is the youngest (17-years old) doctor of Indian origin in the world who received his medical degree from Mount Sinai, New York.
• Ambedkar, B.R is known as the architect of the Indian Constitution.
• Apsra is the first nuclear reactor of India.
• Aquaculture refers to fish-farming or fish culture.
• Baku is famous for the production of petroleum.
• Blue revolution relates to fish farming.