GENERAL KNOWLEDGE QUESTIONS FOR PPSC, SPSC, FPSC TESTS AND OTHER COMPETITIVE EXAMS OF CSS, ISSB, PMS, PAF, ARMY, NAVY AND POLICE
NTS GENERAL KNOWLEDGE QUESTIONS
EVERYDAY SCIENCE, PHYSICS AND BIOLOGY
1st Edition
NTS GENRAL KNOWLEDGE QUESTIONS OF PHYSICS, CHEMISTRY, BIOLOGY AND EVERYDAY SCIENCE
Theory of mutation was propounded by Hygo de
Vries.
• A theory of acquired character was given by Lamark.
• Charles Darwin is famous for his theory of struggle for existence and survival of the fittest.
• Sigmund Freud is called as the father of modern psychiatry and psychology.
• Energy stored in stretched spring is Elastic Potential energy
• Energy stored in fossil fuels is chemical energy
• Radio waves are Electromagnetic waves
• A.C voltage is analogue quantity
• Optical fibers work on polarization of electromagnetic waves
• Condenser is used to collect the charge
• In diesel engine ignition takes place by compression
• A radar uses radio waves to detect enemy aircraft
• Law of floating bodies was given by Archimedes
• Particle with +ve charge but mass equal to electron is positron
• Nucleus of an atom has +ve charge.
• Bosons are Photons and Mesons
• There is no neutron in the atom of hydrogen
• Quark is an atomic particle. Scientists think that proton and neutrons are themselves made of still smaller particles called quarks
• Muttons are particles of atom
• John Dalton, an English scientist, gave Atomic Theory in 1803 describing atom as the smallest unit of an element
• Gas in children’ s balloon is Helium
• Weight of electron = 9.1 x 10 power -31 kg
• Charge on electron = 1.6 x 10 power -19 coulomb
• Weight of proton = 1.66 x 10 power -27 kg
• Charge on proton = 1.6 x 10 power -19 coulomb
• A proton is 1836 times heavier than an electron
• Ordinarily and atom is a neutral particle
• Ernest Rutherford, a New Zealander, in 1908 discovered Atomic Nucleus
• Speed of sound is faster in hot air than in cold air
• Ultrasonic are sound waves of high frequency = 12000 cycles/sec and higher
• Sound travels faster in moist air than in dry air
• Sound travels more rapidly in solids
• Sound travels more rapidly in solids
• Maximum limit of sound beyond which a man can become deaf is 129 decibel
• Audible sound is 20-20,000 cycles/second
• Inaudible sound >20,000 cycles/second
• Velocity of sound at 0 deg: C is 331.7 m/s
• Echo can only be produces when the distance of the obstacle is at least 17 meters
• When we hear a sound, its impressions remain in our ear for 1/10th of a second
• Image persists for about 1/10th of second in our eye
• For creating a persistence of vision, pictures are projected at the rate of 10 or more/sec
• Nuclear Energy is not a source of alternative energy.
• Videotape used in camcorders to record audio and video signal employee fine grains of iron oxide.
• Temperature inside a refrigerator is 40 deg: F
• The laws of reflection were first discovered by a al- Hazen
• 0.200 grams are equal to one carat.
• One million cycles per second is called Megahertz.
• Carbon fiber is made by heating textile fibers. These are used in tennis rackets and racing yacht
• Catalytic converter reduce the harmful fumes the engine emits
• If you double the voltage you double the current (Ohm’s law)
• What product uses the most silver-Camera Film
• The speed of sound depends on the medium through which the waves are passing. The speed of sound in gases depends on what? Density
