Edward Jenner coined the term vaccine and vaccination. It is derived from the cow smallpox. Edward Jenner is well known for his contribution to the eradication of smallpox and immunization. In 1790, he created the world`s first vaccine for smallpox.
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2. In which sphere Ozone layer depletion is found?
When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere.
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3. What is the dominating range of light wavelengths in the lower atmosphere?
In the lower layers of the atmosphere, the range of light wavelength that is most predominant is between 400 and 700 nm, also referred to as visible light.
It is stable due to its natural liquid nature (saline), dissolved oxygen, light, and temperature. An environment is considered to be stable when its structure and function remain unchanged for a long period of time. The ocean is the most stable ecosystem among the choices.
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5. Vitamin which is believed to cure the common cold
Although not fully proven, large doses of vitamin C may help reduce how long a cold lasts. Large doses of vitamin C do not protect against getting a cold. Vitamin C may also be helpful for those exposed to brief periods of severe or extreme physical activity. The likelihood of success may vary from person to person.
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6. Which of the given diseases caused due to deficiency of iodine?
In adults, mild to moderate iodine deficiency can cause goiter as well as impaired mental function and work productivity secondary to hypothyroidism. Chronic iodine deficiency may be associated with an increased risk of the follicular form of thyroid cancer
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7. The amount of air that moves in and out of the lungs, with each inspiration and expiration is called
Tidal volume is the amount of air that moves in or out of the lungs with each respiratory cycle. It measures around 500 mL in an average healthy adult male and approximately 400 mL in a healthy female.
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8. Children with pot belly is an indicative of which type of disease
Kwashiorkor is a type of malnutrition characterized by severe protein deficiency. It causes fluid retention and a swollen, distended abdomen. Kwashiorkor most commonly affects children, particularly in developing countries with high levels of poverty and food insecurity.
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9. Which of the following is a renewable source of energy that is used to power vehicles?
Ethanol is used to power vehicles as an alternate source of energy because ethanol in the presence of heat reacts with atmospheric oxygen to release energy and form carbon dioxide and water. This is a chemical reaction.
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10. What is the primary function of phosphorus in the human body?
Function. The main function of phosphorus is in the formation of bones and teeth. It plays an important role in how the body uses carbohydrates and fats. It is also needed for the body to make protein for the growth, maintenance, and repair of cells and tissues.
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11. Which of the following is a common symptom of food poisoning?
Symptoms of food poisoning often include upset stomach, diarrhea and vomiting. Symptoms usually start within hours or several days of eating the food. Most people have mild illness and get better without treatment
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12. What is cross-contamination?
A
Using the same cutting board for raw meat and vegetables without washing it
Foods involved in outbreaks of salmonellosis include eggs, poultry and other products of animal origin. Foodborne cases with Campylobacter are mainly caused by raw milk, raw or undercooked poultry and drinking water.
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14. At what minimum internal temperature should poultry be cooked to ensure it is safe to eat?
There are three important temperatures to remember when cooking meat or eggs at home: Eggs and all ground meats must be cooked to 160°F; poultry and fowl to 165°F; and fresh meat steaks, chops and roasts to 145°F. Use a thermometer to check temperatures.
Health promotion reduces premature deaths. By focusing on prevention, health promotion reduces the costs (both financial and human) that individuals, employers, families, insurance companies, medical facilities, communities, the state and the nation would spend on medical treatment.
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16. Which hormone regulates blood glucose levels by facilitating the uptake of glucose into cells?
Insulin, together with its principal counter-regulatory hormone glucagon, regulates blood glucose concentrations. Pancreatic β cells secrete 0.25–1.5 units of insulin per hour during the fasting (or basal) state, sufficient to enable glucose insulin-dependent entry into cells.
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17. Which vitamin is crucial for the absorption of calcium in the body?
Optimal vitamin D levels are necessary to increase the efficiency of calcium absorption. Without adequate vitamin D, the body absorbs no more than 10% to 15% of dietary calcium.
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18. which micronutrient is body`s main source of energy?
Carbohydrates are the preferred source of energy. If the diet does not provide adequate carbohydrates the body will draw mainly upon proteins for its energy needs. By eating adequate amounts of carbohydrates, proteins will be spared to be used for growth, development and regulatory functions of the body.
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19. Most kidney stones are usually in the form of which among the following?
Most kidney stones are calcium stones, usually in the form of calcium oxalate.
Oxalate is a substance made daily by your liver or absorbed from your
diet. Certain fruits and vegetables, as well as nuts and chocolate, have
high oxalate content.
Notice that photosynthesis and respiration
are essentially the opposite of one another. Photosynthesis removes CO2
from the atmosphere and replaces it with O2. Respiration takes O2 from
the atmosphere and replaces it with CO2.
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25. ____ is the spontaneous passage or diffusion of water or other solvents through a semipermeable membrane.
osmosis, the
spontaneous passage or diffusion of water or other solvents through a
semipermeable membrane (one that blocks the passage of dissolved
substances—i.e., solutes).
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26. The infertile Saline soils contain largely proportion of which of the following?
Saline soils contain a larger proportion of sodium, potassium, and magnesium,
and thus, they are infertile and do not support any vegetative growth.
They have more salts, largely because of the dry climate and poor
drainage.
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27. The saliva contains an enzyme called ____ that breaks down carbohydrates which is a complex molecule to give sugar.
Different substances have different vapor pressures at a given temperature due to the strength of their intermolecular forces.
For molecules to escape into the vapor phase, they must have enough
kinetic energy to overcome the intermolecular forces of other molecules
at the surface of the liquid.
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31. Which of the following is the function of kidney?
Carbon monoxide
(CO) is a colourless, odourless gas produced by the incomplete
combustion of carbonaceous fuels such as wood, petrol, coal, natural gas
and kerosene in simple stoves, open fires, wick lamps, furnaces,
fireplaces.
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34. Which of the following is the commercial unit of electric energy which is commonly known as units in electricity bills
Lactobacillus Bacteria
in Milk that changes Milk to Curd. When milk is heated to a temperature
of 30-40 degrees centigrade and a small amount of old curd added to it,
the lactobacillus in that curd sample gets activated and multiplies.
These convert the lactose into lactic acid.
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39. On what among the following factors does the resistance of wire depend?
A
directly proportional to the length of the conduction
B
inversely proportional to the cross sectional area of the conductor
Resistance is
directly proportional to the length of a wire. Area of a cross-section
of wire: Resistance is inversely proportional to the area of
cross-section the wire. The temperature of the wire: Resistance of a
wire is directly proportional to the temperature of the wire.
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40. If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of which among the following?
Camphor converts
directly into its gaseous state without converting into a liquid state.
This phenomenon is called sublimation. Hence, when it`s kept in open its
quantity keeps on decreasing as it converts to its gaseous state.
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41. Which among the following is the causal organism of chikenpox?
The simple definition of water hardness is the amount of dissolved calcium and magnesium in the water. Hard water is high in dissolved minerals, largely calcium and magnesium.
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44. The cells that line the small intestine release additional enzymes that finally break apart the smaller protein fragments into the individual ____
The two major
pancreatic enzymes that digest proteins are chymotrypsin and trypsin.
The cells that line the small intestine release additional enzymes that
finally break apart the smaller protein fragments into the individual amino acids.
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45. Which among the following is combined with oxygen in the cells and produces CO2 and water during respiration?
Sodium thiosulfate
is an inorganic sodium salt composed of sodium and thiosulfate ions in a
2:1 ratio. It has a role as an antidote to cyanide poisoning, a
nephroprotective agent and an antifungal drug.
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49. BGG vaccination is given to prevent against which of the following diseases?
BCG, or bacille
Calmette-Guerin, is a vaccine for tuberculosis (TB) disease. Many
foreign-born persons have been BCG-vaccinated. BCG is used in many
countries with a high prevalence of TB to prevent childhood tuberculous
meningitis and miliary disease.
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50. What will be the image formation by a convex mirror when object is at infinity?
To increase the
solubility of CO2 in soft drinks and soda water, the bottles are sealed
under high pressure. The solubility of a gas in a liquid is directly
proportional to the pressure of the gas.
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53. Which of the following is the major pollinator?
Echolocation, also called bio sonar, is a biological sonar used by several animal species. Echolocating animals emit calls out to the environment and listen to the echoes of those calls that return from various objects near them. They use these echoes to locate and identify the objects.
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62. Why does the clear sky appear blue?
A
blue light gets absorbed in the atmosphere
B
ultraviolet radiations are absorbed in the atmosphere
C
the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible
D
light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
The sky appears blue on a clear day because of the scattering of blue component of white sunlight by air molecules presents in the atmosphere. When sunlight passes through the atmosphere, most of the longer wavelength lights do not get scattered much and hence pass straight through the atmosphere.
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63. Which among the following is a clear, colourless, viscous, sweet-tasting liquid belonging to the alcohol of organic compounds?
Zinc is an essential trace element involved in the correct packing and storage of insulin. Total zinc content in the pancreatic β-cells is among the highest in the body and changes in the Zn(2+) levels have been found to be associated with diabetes.
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70. Which of the following is the largest bone found in human body?
Galvanizing is the process of applying zinc coating to a more noble metal (popularly steel or iron) to prevent corrosion (rusting). Hot-dip galvanization is the most well-known method in which the steel part is submerged in a bath of molten zinc.
The sclera is the dense connective tissue of the eyeball that forms the "white" of the eye. It is continuous with the stroma layer of the cornea. The junction between the white sclera and the clear cornea is called the limbus.
The sclera ranges in thickness from about 0.3 millimeter (mm) to 1.0 mm. It is composed of fibrils (small fibers) of collagen that are arranged in irregular and interlacing bundles. The random arrangement and interweaving of these connective tissue fibers are what account for the strength and flexibility of the eyeball.
The sclera is relatively inactive metabolically and has only a limited blood supply. Some blood vessels pass through the sclera to other tissues, but the sclera itself is considered avascular (lacking blood vessels).
Superconductor material classes include chemical elements like mercury or lead, alloys such as niobium-titanium, germanium-niobium, and niobium nitride, or organic superconductors.
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79. Lung cancer be be caused by which of the following hazardous substance?
Asbestos particles is a hazardous substance that can cause lung cancer. · Asbestos is made up of microscopic fibers that can easily become airborne and inhaled.
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80. Among the following, what is Cupric sulfate commercially known as?
To measure blood pressure, your doctor uses an instrument call a sphygmomanometer, which is more often referred to as a blood pressure cuff. The cuff is wrapped around your upper arm and inflated to stop the flow of blood in your artery.
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83. What is the full form of MSG, a chief flavor enhancer used in the food industry?
Rock salt or halite is the form of sodium chloride. Brine is a solution of water and salt has a lower freezing point than pure water putting salt or saltwater on ice that is near 0oC will cause it to melt. It is called as de-icing done after snowstorm to improve traction.
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86. Which of the following when added to pure water usually increases its surface tension?
The surface tension of water is increased when salt is added to it. Although the strong interactions between sodium cations and partial negative oxygen, and chloride anions and partial positive hydrogens disrupt some hydrogen bonding between water molecules, they actually strengthen the surface tension of water.
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87. The period of transition from childhood and adulthood is known as
Adolescence is the period of transition between childhood and adulthood. Children who are entering adolescence are going through many changes (physical, intellectual, personality and social developmental). Adolescence begins at puberty, which now occurs earlier, on average, than in the past.
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88. The branch of Physics concerned with the properties of sound.
Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound.
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89. The process of breaking molecules in the absence of oxygen is called ___________.
104. Which of the following processes denotes water soluble inorganic nutrients go down
into the soil horizon and gets precipitated as unavailable salts?
The Sun is the primary source of energy for Earth`s climate system is the first of seven Essential Principles of Climate Sciences. Principle 1 sets the stage for understanding Earth`s climate system and energy balance. The Sun warms the planet, drives the hydrologic cycle, and makes life on Earth possible. Each second, more than four million tonnes of matter are converted into energy within the Sun`s core, producing neutrinos and solar radiation.
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110. Which of the following is an example of secondary electrical battery?
149. A coil with 25 turns and 2 cm length is passed in 1 second over a bar magnet`s north pole and pulled away in 0.5 sec through the same distance. What will you observe?
A
The current induced in the coil is highest when the coil is moved parallel to the magnetic field.
B
The current induced in the coil is highest when the coil is moved at an angle of 45 degrees to the magnetic field to the magnetic field.
C
The current induced in the coil is highest when the coil is moved perpendicular to the magnetic field.
D
The current induced in the coil is lowest when the coil is moved perpendicular to the magnetic field
152. The solar energy reaching unit area at outer edge of the earth`s atmosphere exposed perpendicularly to the rays of the Sun at the average distance between the Sun and earth is known as
156. A particle moves on X-axis starting from x=1.0 If the particle moves 5.0 units in the positive direction and 3.0 units in the negative direction, then the displacement d is given by the expression
158. Firewood has low heat content per kg of its mass. Which one of the following technologies can be used to convert firewood to a better source of energy?
Epilepsy is a central nervous system (neurological) disorder in which brain activity becomes abnormal, causing seizures or periods of unusual behavior, sensations and sometimes loss of awareness. Anyone can develop epilepsy. Epilepsy affects both males and females of all races, ethnic backgrounds and ages.
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166. The hormone released by the pineal gland that regulates the sleep-wake cycle is called _______.
Calorific value is the amount of heat energy present in food or fuel and which is determined by the complete combustion of specified quantity at constant pressure and in normal conditions.
Wood has the lowest calorific value which is 18,000 kJ/kg
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170. What is the value of absolute zero temperature in Kelvin scale?
Absolute zero, technically known as zero kelvins, equals −273.15 degrees Celsius, or -459.67 Fahrenheit, and marks the spot on the thermometer where a system reaches its lowest possible energy, or thermal motion.
Absolute zero on Kelvin scale is 0K , the lowest temperature possible .
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171. At which place on earth the value of gravity is maximum?
Tuberculosis (TB) is caused by a bacterium called Mycobacterium tuberculosis. The bacteria usually attack the lungs, but TB bacteria can attack any part of the body such as the kidney, spine, and brain.
AIDS is a deadly disease caused by HIV (human immunodeficiency virus). The virus has an envelope of protein coat enclosing the Single stranded RNA genome with reverse transcriptase. The core is surrounded by a protein coat called p24. Outside this protein coat is a layer of another protein called p17.
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214. Nipah is a zoonotic paramyxovirus; where did it originate:
While plants can absorb water through their leaves, it is not a very efficient way for plants to take up water. If water condenses on the leaf during high humidity, such as fog, then plants can take in some of that surface water. The bulk of water uptake by most plants is via the roots.
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216. Which of the following is a non metal that remains liquid at room temperature:
The largest artery is the aorta, the main high-pressure pipeline connected to the heart`s left ventricle. The aorta branches into a network of smaller arteries that extend throughout the body. The arteries smaller branches are called arterioles and capillaries.
water being a liquid, its conductivity depends upon is dissociation into ions, but due to the low concentration of H+ and OH− ions, it is considered as a non-electrolyte and is a poor conductor of electricity.
The stamen is the male reproductive organ. It consists of a pollen sac (anther) and a long supporting filament. This filament holds the anther in position, making the pollen available for dispersal by wind, insects, or birds.
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222. What is the melting point of water at sea level?
Pure water transitions between the solid and liquid states at 32°F (0°C) at sea level. This temperature is referred to as the melting point when rising temperatures are causing ice to melt and change state from a solid to a liquid (water).
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223. Which of the following is an example of water borne communicable disease?
The pathogenic microorganisms, their toxic exudates, and other contaminants together, cause serious conditions such as cholera, diarrhea, typhoid, amebiasis, hepatitis, gastroenteritis, giardiasis, campylobacteriosis, scabies, and worm infections, to name a few.
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224. Scurvy (Sailors disease) is caused due to the deficiency of __________.
Members of this family belong to a single genus, Flavivirus, and cause widespread morbidity and mortality throughout the world. Some of the mosquitoes-transmitted viruses include: Yellow Fever, Dengue Fever, Japanese encephalitis, West Nile viruses, and Zika virus
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229. Isotone are species of atoms that have the same number of __________.
Isotone, any of two or more species of atoms or nuclei that have the same number of neutrons. Thus, chlorine-37 and potassium-39 are isotones, because the nucleus of this species of chlorine consists of 17 protons and 20 neutrons, whereas the nucleus of this species of potassium contains 19 protons and 20 neutrons.
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230. Indole-3-acetic acid (IAA), a Plant Growth Regulator (PGR) is also called ________.
Indole-3-acetic acid (IAA) is the most common plant hormone of the auxin class and it regulates various aspects of plant growth and development. Thus, the terms “auxin” and “IAA” are occasionally used interchangeably.
The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg.
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232. The phenomenon of splitting of light into its colours is known as _________.
The number of oscillations per second of a vibrating object is known as its frequency. Time period is the time required to complete one oscillation. Loudness of a sound is proportional to the square of the amplitude of its vibration.
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234. Pick the characteristic feature of plane mirror.
An image formed by a plane mirror has the following characteristics: Virtual and erect. Behind the mirror. The size of the image is equal to the size of the object. Laterally inverted image (image of the left side visible on the right side).
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235. Which of the following fuels has the highest calorific value?
Calorific value is nothing but the energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram. Hence, hydrogen has the highest calorific value.
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236. What is the household name of Sodium Hydrogen carbonate?
Guttation is the exudation of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses, and a number of fungi. Guttation is not to be confused with dew, which condenses from the atmosphere onto the plant surface.
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238. Which of the following is an example of communicable disease?
Some examples of the communicable disease include HIV, hepatitis A, B and C, measles, salmonella, measles, and blood-borne illnesses. Most common forms of spread include fecal-oral, food, sexual intercourse, insect bites, contact with contaminated fomites, droplets, or skin contact.
Nidovirales is an order of enveloped, positive-strand RNA viruses which infect vertebrates and invertebrates. Host organisms include mammals, birds, reptiles, amphibians, fish, arthropods, molluscs, and helminths. The order includes the families Coronaviridae, Arteriviridae, Roniviridae, and Mesoniviridae.
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243. What is meant by DDT, an environmental pollutant?
Dichlorodiphenyltrichloroethane, commonly known as DDT, is a colorless, tasteless, and almost odorless crystalline chemical compound, an organochloride. Originally developed as an insecticide, it became infamous for its environmental impacts. DDT was first synthesized in 1874 by the Austrian chemist Othmar Zeidler.
Water acts as a polar solvent because it can be attracted to either the positive or negative electrical charge on a solute. The slight negative charge near the oxygen atom attracts nearby hydrogen atoms from water or positive-charged regions of other molecules.
Plague is a disease that affects humans and other mammals. It is caused by the bacterium, Yersinia pestis. Humans usually get plague after being bitten by a rodent flea that is carrying the plague bacterium or by handling an animal infected with plague.
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247. Which of the following illustrates Newton`s Third Law of Motion?
Fat-soluble vitamins are absorbed along with fats in the diet and are stored in the body`s fatty tissue and in the liver. They are found in many plant and animal foods and in dietary supplements. Vitamins A, D, E, and K are fat-soluble.
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249. Which of the following nutritional deficiencies causes the condition Osteoporosis?
Osteoporosis is associated with low intake of calcium and other nutrients. Dietary copper deficiency might stimulate bone metabolism and increase in hip fractures. Excess vitamin A intake was also associated with lower bone mineral density and higher risk of hip fractures.
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250. Who proposed an atom model with discrete orbits called energy levels?
Bohr Atomic Model. Bohr Atomic Model : In 1913 Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus.
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251. Pick the organism that reproduces by budding.
Budding is a type of asexual reproduction, which is most commonly associated in both multicellular and unicellular organisms. Bacteria, yeast, corals, flatworms, Jellyfish and sea anemones are some animal species which reproduce through budding.
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252. Atoms of different elements with different atomic numbers, but same mass number are called _____.
Linear momentum is defined as the product of a system`s mass multiplied by its velocity. In symbols, linear momentum is expressed as p = mv. Momentum is directly proportional to the object`s mass and also its velocity. Thus the greater an object`s mass or the greater its velocity, the greater its momentum.
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254. Which Vitamin is called anti-sterility vitamin?
Vitamin E was first discovered by Evans and Bishop in 1922, and it was initially denoted as an “anti-sterility factor X” that was necessary for reproduction . Since then, vitamin E has been well characterized as a powerful lipid-soluble antioxidant through extensive research.
A moderator is a material used in a nuclear reactor to slow down the neutrons produced from fission. By slowing the neutrons down the probability of a neutron interacting with Uranium-235 nuclei is greatly increased thereby maintaining the chain reaction.
Heavy water (D2O) is used as a moderator in nuclear reactor. It containing significantly more than the natural proportions (one in 6,500) of heavy hydrogen (deuterium, D) atoms to ordinary hydrogen atoms. Heavy water is used as a moderator in some reactors because it slows down neutrons effectively and also has a low probability of absorption of neutrons.
The only liquid elements at standard temperature and pressure are bromine (Br) and mercury (Hg). Although, elements caesium (Cs), rubidium (Rb), Francium (Fr) and Gallium (Ga) become liquid at or just above room temperature.
Graphite is structurally composed of planes of polycyclic carbon atoms that are hexagonal in orientation. The distance of carbon atoms between planes is longer and therefore the bonding is weaker. Graphite is best suited for lubrication in air. It is a mineral made of loosely bonded sheets of carbon atoms, giving it a slippery texture that makes it a very effective lubricant. This slippery quality also makes graphite a good material for pencil lead because it easily sloughs off onto paper. Graphite is bonded by covalent bond, thus, it is helf by weak intermolecular forces. Since it has weak intermolecular forces, graphite would be slippery and soft enough to act as a lubricant.
The list of Green House Gases are as follows: 1) Water vapor 2) Carbon dioxide 3) Methane 4) Nitrous oxide 5) Ozone 6) Chlorofluorocarbons. Hydrogen is not a Green House Gas.
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304. Quartz crystals normally used in quartz clocks etc. is chemically :
One such chelate is chlorophyll, the green pigment of plants. In chlorophyll the central ion is magnesium, and the large organic molecule is a porphyrin. The porphyrin contains four nitrogen atoms that form bonds to magnesium in a square planar arrangement.
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310. Which of the following is a non metal that remains liquid at room temperature?
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine.
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311. Brass gets discoloured in air because of the presence of which of the following gases in air?
Risus sardonicus or rictus grin is a highly characteristic, abnormal, sustained spasm of the facial muscles that appears to produce grinning. It may be caused by tetanus.
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315. Name of a bacterial disease with oral manifestation is:
Severe lack of vitamin D causes rickets, which shows up in children as incorrect growth patterns, weakness in muscles, pain in bones and deformities in joints. This is very rare. However, children who are deficient in vitamin D can also have muscle weakness or sore and painful muscles.
There are nine water-soluble vitamins: the B vitamins -- folate, thiamine, riboflavin, niacin, pantothenic acid, biotin, vitamin B6, and vitamin B12 -- and vitamin C. Deficiency of any of these water-soluble vitamins results in a clinical syndrome that may result in severe morbidity and mortality.
Vitamin A, also known as retinol, is a fat-soluble vitamin traditionally associated with vision and eye health. The most abundant dietary sources of vitamin A are liver, fish liver oil and butter.
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321. The blister form of copper is the ............form:
The letters pH stand for potential of hydrogen, since pH is effectively a measure of the concentration of hydrogen ions (that is, protons) in a substance.
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323. The Average human body contains about ..............gram of sodium chloride:
The human body contains many salts, of which sodium chloride (AKA common table salt) is the major one, making up around 0.4 per cent of the bodys weight at a concentration pretty well equivalent to that in seawater.
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324. The substance which increases the the rate of Chemical reaction is:
Hydrogen is the most abundant element in the universe, accounting for about 75 percent of its normal matter, and was created in the Big Bang. Helium is an element, usually in the form of a gas, that consists of a nucleus of two protons and two neutrons surrounded by two electrons.
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326. All electromagnetic radiations travel through vaccum with the speed:
Generally speaking, we say that light travels in waves, and all electromagnetic radiation travels at the same speed which is about 3.0 * 108 meters per second through a vacuum. We call this the "speed of light"; nothing can move faster than the speed of light.
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327. A Transistor is a semiconductor device with at least..........terminals.
A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. Transistors are one of the basic building blocks of modern electronics. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit.
If you add salt to water, you raise the waters boiling point, or the temperature at which it will boil. The temperature needed to boil will increase about 0.5 C for every 58 grams of dissolved salt per kilogram of water.
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330. An Instrument used to measure gas pressure is called:
In colloquial speech, speed of sound refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance: typically, sound travels most slowly in gases, faster in liquids, and fastest in solids.
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333. A body weighs 10 kgs on the equator. At the poles, it is likely to weigh
A body weighs more at the poles than at the equator, because the earth is not a perfect square, but it is flattened at the poles. The distance between the equator and the centre of the earth and the poles, therefore the force of gravitation is more at the poles than at the equator, and so it weighs more at the poles than equator.
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334. Which one among the following statements about thermal conductivity is correct?
Thermal conductivity is defined as the heat flow per unit time. Steel has a higher thermal conductivity than water and wood. [Thermal conductivity of steel = 50.2 w/mk Thermal conductivity of water = 0.6 w/mk Thermal conductivity of wood = 0.12 w/mk]
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335. Which among the following is the hardest part of our body?
The ozone layer or ozone shield is a region of Earth`s stratosphere that absorbs most of the Sun`s ultraviolet radiation. It contains a high concentration of ozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.
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337. Which of the following is source of renewable energy?
Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year.
Platelets are tiny blood cells that help your body form clots to stop bleeding. If one of your blood vessels gets damaged, it sends out signals to the platelets. The platelets then rush to the site of damage and form a plug (clot) to fix the damage.
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340. Which attribute of sound wave is related to the loudness of sound?
The amplitude of a sound wave determines it relative loudness. In music, the loudness of a note is called its dynamic level. In physics, we measure the amplitude of sound waves in decibels (dB), which do not correspond with dynamic levels.
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341. Which of the following gases is not responsible for global warming?
Your circulatory system is made up of several parts, including your: Heart: This muscular organ works to pump blood throughout your body via an intricate network of blood vessels. Arteries. These thick-walled blood vessels carry oxygenated blood away from your heart. Veins: These blood vessels carry deoxygenated blood back toward your heart. Capillaries: These tiny blood vessels facilitate the exchange of oxygen, nutrients, and waste between your circulatory system and your organs and tissues.
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343. Graphite is a good conductor of electricity. It is because
Since graphite is a crystalline solid it can be defined by a basic unit cell. Graphite is hexagonal and therefore is defined by a hexagonal unit cell. ... Since each unit cell contains “centered” and “edge” carbon atoms the unit cell is considered a “centered” unit cell as opposed to a primitive unit cell.
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344. After diagnosis of a disease in a person, the doctor advices the patient iron and folic acid tablets
Osteoporosis is a condition in which bones are fragile and are more susceptible to fractures. Anaemia is a condition in which there is a deficiency of red blood cells or haemoglobin in the blood. It may result due to lack of iron or folic acid. Regular dose of iron and folic acid tablets reduces anaemia. Goitre is a condition in which there is swelling in the neck due to enlarged thyroid gland. Protein-energy malnutrition (PEM) is a condition in which there is deficiency of protein and energy resulting in various disorders like marasmus and kwashiorkor.
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345. Altitude sickness is caused at high altitude due to