Science & Technology Questions for Various Forthcoming Competitive Exam

  • What is the average speed of a bee?
  • 10 km/h (B) 5 km/h (C) 1 km/h (D) 16 km/h
  1. How do the members of honey­bee hive recognise each-other?
  • by smell
  • by eyes
  • by dancing
  • by touching
  1. Which one is a stimulant ?
  • Alcohol (B)    Marijuana

(C) Cigarette      (D)    Opium

  1. Soft drinks such as cocoa cotain significant quantities of—
  • caffeine (B)    nicotine

(C) tannin          (D)    renin

  1. A small pouch containing silica gel is often found in bottles of medicine in tablet or powder form because silica gel—
  • kills bacteria
  • kills germs and spores
  • absorbs moisture
  • absorbs all gases present inside the bottle
  1. At which temperature supercon­ductivity can be of tremendous economic interest saving billions of rupees—
  • At very low temperature
  • At a temperature when semiconductor becomes a superconductor
  • at room temperature
  • At a very high temperature
  1. In laboratory who did synthesis of DNA ?
  • Milar (B) Khurana

(C) D-Veris       (D) Kelvin

  1. Who among the following scientists shared the Nobel Prize in Physics with his son?
  • Max Planck
  • Albert Einstein
  • William Henry Bragg
  • Enrico Feimi
  1. For outstanding contribution to which one of the following fields in Shanti Swaroop Bhatnagar Prize given ?
  • Literature
  • Performing Arts
  • Science
  • Social Service
  1. Which part of eye is used in donation ?
  • Retina
  • Cornea
  • The whole eye
  • Eye lens
  1. The first heart transplant was performed by—
  • William Harvey
  • F.G. Hopkins
  • Loues Pasteur
  • Christian Bernard
  1. The ‘Pace Maker’ is also knows as—
  • A. Nodes
  • V. Nodes
  • Bundle of His
  • Chordate tensional
  1. During dehydration, the subs­tance that is usually lost by the body is—
  • Sugar
  • Calcium phosphate
  • Sodium chloride
  • Potassium chloride
  1. The only snake that builds a nest

is—

  • Chain viper
  • King Cobra
  • Krait
  • Saw-scaled viped
  1. Which printer is usually used for desk-top printing ?
  • Daisy wheel printer
  • Dot matrix printer
  • Laser printer
  • None of the above
  1. In which faculty is scientist Evan Pavlov known for ?
  • Physics
  • Mathematics
  • Chemistry
  • Experimental Psychology
  1. A man feels unpleasant due to humidity and heat. The reason for this is—
  • More sweating
  • Less sweating
  • Sweat does not evaporate due to humidity
  • Sweat is not formed due to humidity
  1. Which of the following actions is related with evaporation of sweat ?
  • Exothermic Action
  • Endothermic Action
  • Chemical Action
  • Salty Reaction
  1. The largest flower of the world is—
  • Lotus
  • Raflosia
  • very large cectus
  • None is true
  1. It is harmful to sleep under a tree an night because the tree releases—
  • Oxygen
  • Carbon dioxide
  • Carbon mono-oxide
  • Sulphur dioxide
  1. (D) A bee’s flight speed averages about 15 miles per hour and they’re capable of flying 20 miles per hour. If they’re not carrying nectar, pollen, water or propolis (plant resin), they’ll fly much faster!
  2. (C) The members of honey-bee hive recognise each-other by
    dancing Karl Ritter von Frisch, For MemRS was an Austrian ethologist who received the Nobel Prize in Physiology or Medicine in 1973, along with Nikolaas Tinbergen and Konrad Lorenz. He told us that know­ledge about feeding places can be relayed from bee to bee. The means of communication is a special dance of which there are two forms :
  • Round dance
  • Waggle dance.
  1. (C) In lesser doses (an average cigarette yields about 2 mg of absorbed nicotine), the substance acts as a stimulant in mammals, while high amounts (50-100 mg) can be harmful. This stimulant effect is a major contributing factor to the addictive properties of tobacco smoking.
  2. (A) Caffeine is a common ingre­dient of soft drinks, such as cola, originally prepared from kola nuts. Soft drinks typically contain 10 to 69 milligrams of caffeine per 12 ounce serving. By con­trast, energy drinks, such as Red Bull, can start at 80 milligrams of caffeine per serving. The caffeine in these drinks either originates from the ingredients used or is an additive derived from the product of decaffeination or from chemical synthesis. Guarana, a prime ingredient of energy drinks, contains large amounts of caffeine with small amounts of the obromine and the ophylline in a naturally occurring slow- release excipient.
  3. (C) Silica gel is most commonly encountered in everyday life as beads in a small (typically 2×3 cm) paper packet. In this form, it is used as a desiccant to control local humidity to avoid spoilage or degradation of some goods. Because silica gel can have added chemical indicators and adsorbs moisture very well, silica gel packets usually bear warnings for the user not to eat the contents.
  4. (C) Superconductivity is a phenomenon of exactly zero electrical resistance and expul­sion of magnetic field occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamer- lingh Onnes on April 8, 1911 in Leiden. The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper ‘or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.
  5. (B) Har Gobind Khorana also known as Hargobind Khorana was an Indian-American bio­chemist who shared the 1968 Nobel Prize for Physiology or Medicine with Marshall W. Nirenberg and Robert W. Holley for research that helped to show how the order of nucleotides in nucleic acids, which carry the genetic code of the cell, control the cell’s synthesis of proteins.
  6. (C) Sir William Henry Bragg was a British physicist, chemist, mathematician and active sports­man who uniquely shared a Nobel Prize with his son William Lawrence Bragg—the 1915 Nobel Prize in Physics : “for their services in the analysis of crystal structure by means of X-rays.” The mineral Braggite is named after him and his son. He was knighted in 1920.
  7. (C) Shanti Swaroop Bhatnagar was a well-known Indian scientist, a professor of chemistry for over 19 years. He was the first director-general of the Council of Scientific and Indus­trial Research (CSIR), and he is revered as the ‘father of research laboratories’. He was also the first Chairman of the University Grants Commission (UGC). To honour his name and achieve­ments, CSIR instituted an award Shanti Swarup Bhatnagar Prize for Science and Technology, since 1958 for outstanding scientists who made significant contribu­tions in various branches of science.
  8. (C) The entire eye, called the globe, may be surgically removed (enucleated), or only the cornea

. may be used fordonation. Corneal transplantation, also known as corneal grafting, is a surgical procedure where a damaged or diseased cornea is replaced by donated corneal tissue (the graft). When the entire corneal is replace it is known aspenetrating keratoplasty and when only part of the cornea is replaced it is known as lamellar keratoplasty.Keratoplasty simply means surgery to the cornea. The graft is taken from a recently dead individual with no known diseases or other factors that may affect the chance of survival of the donated tissue or the health of the recipient.

  1. (D) The first heart transplant was performed by Dr. Christian Bernard which was a famous surgeon of south Africa. Barnard performed the first transplant on Louis Washkansky on December 3, 1967 at the Groote Schuur Hospital in Cape Town, South Africa.
  2. (A) The sinoatrial node (often abbreviated SA node; also commonly called the sinus node and less commonly the sinuatrial node) is the pacemaker of the heart and is responsible for the initiation of the heart beat. The sinoatrial node is located in the right atrium (right upper cham­ber) of the heart.
  3. (C) Dehydration is the loss of water and salts (Sodium chloride) essential for normal body func­tion.
  4. (B) The king cobra is unusual among snakes in that the female king cobra is a very dedicated parent. She makes a nest for her eggs, scraping up leaves and other debris into a mound in which to deposit them, and remains in the nest until the young hatch. A female usually deposits 20 to 40 eggs into the
    mound, which acts as an incuba­tor. She stays with the eggs and guards the mound tenaciously, rearing up into a threat display if any large animal gets too close, for roughly 60 to 90 days.Inside the mound, the eggs are incuba­ted at a steady 28°C (82°F). When the eggs start to hatch, instinct causes the female to leave the nest and find prey to eat so she does not eat her young.
  5. (C) A laser printer is a popular type of personal computer prin­ter that uses a non impact (keys don’t strike the paper), photo­copier technology. When a document is sent to the printer, a laser beam ‘draws’ the document on a selenium-coated drum using electrical charges.
  6. (D) Evan Pavlov’s primary inter­

ests were the study of physiology and natural sciences. He helped found the Department of Physio­logy at the Institute of Experi­mental Medicine and continued to oversee the program for the next 45 years.

  1. (C) The human body dissipates heat through perspiration and its evaporation. Heat convection to the surrounding air, and thermal radiation are the primary modes of heat transport from the body. Under conditions of high humi­dity, the rate of evaporation of sweat from the skin decreases. Also, if the atmosphere is as warm as or warmer than the skin during times of high humidity, blood brought to the body surface cannot dissipate heat by conduction to the air, and a condition called hyperpyrexia results. With so much blood going to the external surface of the body, relatively less goes to the active muscles, the brain, and other internal organs. Physical strength declines, and fatigue occurs sooner than it would otherwise. Alertness and mental capacity also may be affected, resulting in heat stroke or hyper­thermia.
  1. (B) A change in temperature is another clue that a chemical reaction has occurred. A reaction that results in a decrease in temperature is called an end­othermic reaction.
  2. (B) Raflosia plant with no leaves, no roots, no stem is the biggest flower in the world. It sounds like the stuff of comic books or science fiction. ‘It is perhaps the largest and most magnificent flower in the world’ was how Sir Stamford Raffles described his discovery in 1818 of Rafflesia arnoldii, modestly named after himself and his companion, surgeon-naturalist Dr. James Arnold.
  3. (B) It is harmful to sleep under a tree an night because the tree releases Carbon Dioxide because the absence of light. If light is present the released CO2 is again absorbed in the process of photo­synthesis. So in nights if we sleep under big trees we do not have sufficient amount of oxygen.

P.Darpari

 

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