Science Questions & Answers 1

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  • Briefly describe the technological achievements of the Indus people.
  • Outline Ancient India’s achievements in the Sciences.
  • Outline modern India’s contributions to Science
  • What are the principal aims of India’s nuclear energy programmes? Briefly outline her achievements.
  • Examine the role of the DAE in the development of nuclear technology.
  • What has been achieved in regard to Safety and Environment Concerns
  • Explain the progress made in Research and Development in nuclear energy.
  • Examine the progress made in regard to the development of Indigenous Technology
  • What has been the role of the ECIL in the development of the nuclear power programme.
  • Explain the Spin-off Technologies from the nuclear power programme.
  • What has been the achievement of India in regard to nuclear fuel cycle activities
  • What have been achievements in the field of Agriculture?
  • Explain the contributions of nuclear energy in regard to Water Management
  • What is the relevance of electronics to development?
  • Describe the activities of the DOE.

Science Questions & Answers 2

  • Write a note on Earth quake
  • Which is the hardest substance known?
  • From which substance are dyes manufactured?
  • A dynamite cartridge struck in a rock makes the rock burst on being fired. How does it happen?
  • From what was Uranium isolated?
  • What is the difference between hard and soft coal?
  • What is the safety curtain in cinema or theatre made off?
  • Distinguish between flannel and flannelette?
  • Why does a pansy flower turn its face towards the sun?
  • How does a flowering plant feed itself?
  • Why do the plant or animal bodies decay?
  • What do you know about the creatures which are in between plants and animals?
  • What plants are not green?
  • Which creatures live for ever?
  • How do the plants and the animals differ?
  • Why do the animals depend upon the green plants for their food?
  • Are large plants able to move at all?
  • What is the most poisonous animal?
  • Are all snakes harmful?
  • Why are technical words used for describing plants and animal species?
  • Why do plants need sunlight to make their food?
  • Do the plants breathe in Oxygen?
  • Do ants have a sense of smell?
  • Why a whale does come to the surface of the ocean for breathing?
  • How can a worm live, when it is cut into twos?
  • How do leguminous crops improve the nature of soil?
  • Why are a large number of worms seen after a rain storm?
  • Why should one not sleep under a tree at night?
  • Why has a tree so many leaves?
  • Why do flower pots have holes in the bottom?
  • Science & Technology 3
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  • Which epidemic diseases often occur in India?
  • What preventive measures should be taken for Malaria, Influenza, Cholera?
  • What are the causes and cure of:
  • What is tuberculosis? How can it be prevented?
  • What are the causes, cure and preventive measures of
  • What is the difference between anti-septics, deodorants and disinfectants?
  • What do you know about protective foods?
  • Why is milk an ideal food for babies?
  • Why is sunlight good for our babies.
  • Why does a heavy stone not break a glass place when placed slowly on it, while a small stone falling from a great height easily breaks it?
  • Why is it more difficult to stop a cricket ball than a tennis ball moving with the same velocity?
  • When we press our hand on a table downwards, why we do feel the table pressing our hand?
  • When a gun is fired, why does the gunner receive the jerk?
  • While swimming, why do we press the water backward with our arms and hands?
  • Why does a boat rise higher, when it passes from river water to sea water?
  • Why is it easier to swim in sea water than in river water?
  • Why does a body weigh more at the poles than at the equator?
  • If a body is hung from a spring balance first at the poles and then at the equator, why do the readings of the balance change?
  • Why does a stone fall when thrown upward, while a balloon rises
  • Why does a boat-man push the bank with an oar, when he wants to clear his boat off the bank?
  • Why is it easy to turn over a leaf with a wet finger?
  • How can a bird fly, while a man cannot?
  • When a toy balloon is filled with air and then the air is allowed to go out, why does the balloon whiz away?
  • When we jump from the boat to the bank why does the boat go backwards from the Bank?
  • Why do we lean forward while climbing up a hill?
  • Dust is removed from a carpet, if we strike it with a stick, why?
  • A rope-dancer holds either an umbrella or a bamboostick, while dancing on the rope. Why?
  • Why does a man carrying a load on his back lean forward?
  • How is the Leaning Tower of Pisa standing at its position till now?
  • How is the Leaning Tower of Pisa standing at its position till now?
  • Why does the liquid not come out of the dropper, unless the rubber is pressed?
  • Why do we not feel the enormous weight of the atmosphere above our heads?
  • Why does a cyclist fall forward, if he applies the brakes suddenly?
  • Why does a piece of iron sink in water, while a ship remains floating?
  • Science Q & A 4
  • Why does a body weigh more at the poles than at the equator?
  • If a body is hung from a spring balance first at the poles and then at the equator, why do the readings of the balance change?
  • Why does a stone fall when thrown upward, while a balloon rises?
  • Why does a boat-man push the bank with an oar, when he wants to clear his boat off the bank?
  • Why is it easy to turn over a leaf with a wet finger?
  • How can a bird fly, while a man cannot?
  • When a toy balloon is filled with air and then the air is allowed to go out, why does the balloon whiz away?
  • When we jump from the boat to the bank why does the boat go backwards from the Bank?
  • Why do we lean forward while climbing up a hill?
  • Dust is removed from a carpet, if we strike it with a stick, why?
  • A rope-dancer holds either an umbrella or a bamboostick, while dancing on the rope. Why?
  • Why does a man carrying a load on his back lean forward?
  • How is the Leaning Tower of Pisa standing at its position till now?
  • Why does the liquid not come out of the dropper, unless the rubber is pressed?
  • Why do we not feel the enormous weight of the atmosphere above our heads?
  • Why does a cyclist fall forward, if he applies the brakes suddenly?
  • Why does a piece of iron sink in water, while a ship remains floating?
  • Science Q & A 5
  • How does the towel dry our hands?
  • Why does bluing make things whiter?
  • Why does starch stiffen the clothes?
  • Why are morning and evening less warm than noons?
  • Why are summers hotter than winters?
  • Why are the mountains colder than the plains?
  • Why does a tennis ball bounce higher in Simla than it does in Calcutta?
  • How will you make the clock go fast?
  • Why do the front wheels of a motor car usually lean outwards?
  • Why does fountain pen filler draw up ink?
  • How is soda in a glass sucked up with the help of a straw.
  • Why does railway carriage in motion not leave the rails?
  • If a number of planes are taking off from an aircraft carrier, what is the minimum interval required between the take-off the successive planes?
  • Why is a flywheel used in motor cars?
  • Why is a jet of water curved on coming out of a horizontal nozzel?
  • Why does a thick glass tumbler break, when ice is put in it?
  • Why are the steam pipes and hot water pipes used for heating rooms, not fixed to the walls firmly at both ends?
  • Why are the girders on the railway bridges fixed at one end only?
  • Why does a piece of ice make drink colder?
  • Why are cloudy usually warmer than clear ones?
  • Why are days and nights equal at the Equator throughout the year?
  • Why are the telegraph wires kept a little loose?
  • Why is one’s breath visible in cold, but not in hot weather?
  • Why is water kept in ` earthen pots’ in summer?
  • A burn from steam is more painful than that from boiling water. Why?
  • Why is ice wrapped in gunny bags?

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  • Science Q & A 6
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  • How does fanning produce a sense of coolness on the face?
  • Why does in cold countries, water at the surface freezes while the inner portion it is in the state of water.
  • When a string is placed on a slab of ice, the string passes through it. Why?
  • Why is ice-cream colder to the teeth than cold iced water?
  • Why is a newly made quilt warmer than an old one?
  • What causes smoke to curl up into the air?
  • Why does a dog hang out his tongue, when it is hot?
  • Why does thermos flask keep a hot liquid hot and a cold liquid cold?
  • Why does oil thrown on rough sea make it calmer?
  • Why is heat more oppressive on a damp hot day?
  • Why is dew formed more readily on clear nights than on cloudy ones?
  • If the topper of a bottle has stuck, sometimes it may be removed by heating the neck, why?
  • Why does the snow on the mountains not melt at once, but changes into water very slowly?
  • Why does the water in tanks and ponds not freeze in winter?
  • Why do metallic tools used by blacksmiths have wooden handles?
  • Why do clothes dry quicker in wind than in still air?
  • Why is clinical thermometer used in preference to an ordinary Fahrenheit thermometer?
  • When we pour ice into a tumbler bubbles are seen outside, why?
  • Why do woolen clothes keep us warm in winter?
  • Why does the water boil below 100 degree centigrade on the top of a mountain?
  • Why can’t the meat and dal (pulses) be cooked well on the top of high mountains?
  • When we heat one end of an iron bar, the other end also gets heated up. why?
  • The heat of the sun reaches us and the intervening air is not heated up. Why?
  • Why is a vessel of water heated more quickly, when heat is applied at the bottom than it is heated at the top?
  • Why is the bottom of a kettle blackened and top polished?
  • Science Q & A 7
  • Types of Cropping Patterns and Practices
  • What is deliquescence?
  • What is the basic principle of an internal combustion engine?
  • Why are we able to hear short wave broadcasts better than long wave broadcasts
  • What is the basic characteristic of antigens?
  • Why are detergents superior to the traditional soaps?
  • Stripes on the back of some animals are the indication of-
  • Why is there no twilight on the moon?
  • Why does the air over an oven appear to be quivering?
  • Bacteria was first seen, described and sketched by-
  • In tissue typing, comparison between the child and the father is made on-
  • How does it happen that Pluto is not the farthest planet of the solar system now?
  • Watson-Crick model is a model relating to-
  • What is paraffin oil?
  • What is meant by `Occultation’ of a star?
  • What is radiolysis?
  • What is the main use of Pepsin?
  • What is the main function of centrifuge?
  • Why is water mixed with alcohol applied to the forehead of a person having high fever.
  • The phenomenon of rise or depression of liquid surface in narrow tube is known as-
  • The rate of change of angle of a rigid body rotating about an axis is known as-
  • Why does a body weigh slightly more at the poles than at the equator?
  • What is Easter?
  • What are Lysosomes?
  • What is Golgi apparatus?
  • What is hydroponics?
  • What is egestion?
  • The endocrinal glands are-
  • What are Gymnosperms and Angiosperms?
  • What is a-sexual reproduction?
  • What is pollination?
  • What causes the elongation of stems of genetically dwarf plants?
  • What is a sextant?
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  • Science Q & A 8
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  • Why are gases more easily squeezed than liquids ?
  • Why does water wet glass but mercury does not ?
  • Brownian motion offers strong evidence in support of the … theory
  • A steel needle can be made to float on water due to …
  • Oil rises in a wick due to …
  • Milk is a ….. emuls
  • ion
  • Fog may be called an …
  • Chemical action of an element is dependent on the electrons — True/False
  • If chemical bonding takes place by the transfer of electrons, it is called … bonding
  • Name a device that changes (a) electrical energy to light (b) sound to electrical energy (c) potential energy to kinetic energy (d) electrical energy to kinetic energy
  • What is the amount of work done by someone holding a stone ?
  • What is the S.I. unit of work ?
  • A pendulum bob’s kinetic energy is zero when
  • A girl in pointed heels is likely to do more damage to a wooden floor than an elephant is likely to do. (True/False)
  • Walnuts can be broken in the hand by squeezing two together but not one. Why ?
  • An increase in pressure accompanies …….. in speed.
  • When you blow over a paper sheet it tends to rise. This is explained by ……. Principle.
  • An object sinks in a liquid of (smaller/greater) density than its own.
  • A ship entering a river from the sea would (risk/sink).
  • Science Q & A 9
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  • A stone thrown into a pond creates ripples. These waves
  • In the case of longitudinal waves, the wavelength is the distance between …….
  • A lamp filament that is white-hot, i.e. above 100°C, radiates
  • Which type of electromagnetic radiation is used in the remote control of a television receiver ?
  • An object is sent to burst in the sky and the bang is heard 10 seconds later. If the speed of sound is 330 m/s, how far away is the exploding object ?
  • In a 110 m race, the time-keeper stands near the, finishing line and starts his stopwatch on hearing the bang from the starting pistol. When should he have started his stopwatch and why ?
  • A girl stands 160 m away from a high wall and claps her hands at a steady rate so that each clap coincides with the echo of the one before. If she makes 60 claps in 1 minute, what is the speed of sound ?
  • We can hear sound round the corner of a door. This is an example of ……
  • Sound can be heard sometimes for great distances over water surfaces. This is because sound is ……
  • If a balloon is rubbed, it sticks to the wall at the place where it has been rubbed. Explain.
  • Before replacing a fuse, what is the precaution to be taken ?
  • Why is tungsten used as the filament in a lamp ?
  • If air was used to fill the bulb the tungsten wire …..
  • How much electrical energy (in J) does a 100 W lamp change in 5 seconds ?
  • If a piece of metal was thought to be a magnet, conclusive evidence would be offered of its magnetism only if ……
  • The cell’s shape is usually related to its …..
  • Cell walls are found only in ……. cells.
  • Which part of the cell is called “the power house” ?
  • The “suicide bags” of a cell are the ……
  • Which organelle is considered the centre of protein production ?
  • Which type of cell division plays an important role in regeneration of damaged parts of a living organism ?
  • New genetic variation takes place due to the cell division
  • The chromosomes number is reduced to half during …..