• Resistance was discovered by Girge Ohm in 1826, and is measured in ohms.
• Electricity does not flow through a circuit by itself. It needs a ‘push’, or energy, to keep it moving. We call this energy the voltage of the circuit. Voltage is measured in volts (v).
• The German scientist George Ohm (1787-1854) is best remembered for working out ohm’s law. He discovered that they voltage across a conductor such as a trip of metal or a wire – and the current following through it always vary in the same proportion. So if you double the voltage, you double the current. This is incredibly useful; because it lets you predict the current you will get for a particular voltage.
• The thickness of silk is measured in what- Denier
• Ohm’s law does not apply to semiconductors and conductors when there is change in temperature.
• In our houses we get 220 V a.c. The value of 220 V represents the effective voltage.
• One unit of electric power is consumed when 10 A of current flows for 1 hour at 100 V. 1 Unit = 1 kw hr = 1000 w hr = 100 x 10 x 1 hr
• If the same note is played on a flute and a sitar, one can still distirguish b/w them because they differ in quality.
• A negatively charged glass rod has always less protons than electrons.
• The wavelength of the X-rays is of the order of 0.1 nanometer.
• Red, green and blue are known as primary colours. These are colours which cannot be produced by mixing with other colours.
• Scattering of light ___ the duration of the day (make)
• Oil rises in a wick of oil lamp on account of a property of matter called Capillary Action
• a primary cell can ___ be charged again (not)
• When a person can see nearer objects but not the distant ones he is said to be suffering from : nearsightedness (myopia)
• ATP is a molecule containing high energy bonds.
• An example of inorganic compound is carbon monoxide.
• The time period of a pendulum on moon increases.
• Clinical thermometer usually measures in Fahrenheit.
• Tube light emits radiation even after it is disconnected. It is due to Fluorescence.
• Shortsightedness can be corrected with the use of Concave.
• Rectifier converts AC into DC
• Atomic weight of chemical compounds is determined by Mass spectroscopy.
• Atomic pile is a place where nuclear fission is made.
• Drinker’s apparatus is for measuring the amount of Alcohol in the blood.
• Dewar’s flask is called as thermos.
•
• The conversion of gases into liquid under high pressure and low temperature is called regulation.
• If a green leaf is seen in a red light its color will be black.
• Emerge of VIBGYOR from one side of the prism is due to refraction and dispersion of light.
• Oxidation is the process in which electron is lost.
• Half-time is a time of radioactive substance taken by that substance to decompose radioactivity to half of its weight.
• Light energy is stored in the form of chemical energy due to the activity of Chloroplast.
• Sunlight is composed of seven colours
• Oil rises in a wick of oil lamp on account of a property of matter called Capillary Action
• What is a Fata Morgana- Type of Mirage
•
• Freon-trademark for any of a number of chemical compounds containing fluorine, and often chlorine or bromine. Use: as solvents, as aerosol propellants, in refrigeration. It is commonly used in refrigerator.
Latest Who is Who & What is What (Complete General Knowledge Book) for PPSC PMS PCS FPSC CSS Competitive Exam Preparation Most Helping Guide of PMS Jobs Written Test MCQs Information by Adspk
Adspk11
23/11/2015
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