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Physics , Biology , Everyday Science Mcqs Test

Physics , Biology , Everyday Science Mcqs Test

peptide bond b\w amino acids, joined to form proteins, is the linkage b/w N and C

• An android is any robot that: has the ability to make decisions and formulate plans

• Semaphores were used between sailors for many years to communicate between ships

• One of the first long distance communication system invented in 1790 was the semaphores towers

• Telegraph was invented in 1821

• Telephone was invented in1876

• Us inventor Samuel More developed the system of dots and dashes of telegraph that was known as Morse Code

• Scientist now think that protons and Neutrons are themselves made of still smaller particles called quarks.

• 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.

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