Basic Science (Objective) (Pages :27)

  • 151 Which elements is obtained from sea weeds?

    Ans : Iodine
  • 152 What structure is common to both earthworm and cockroach?

    Ans : Ventral nerve cord
  • 153 Which communicable disease is caused by bacteria?

    Ans : Leprosy
  • 154 What is the conversion of Fe++ to Fe+++?

    Ans : Oxidation
  • 155 If a ship moves from freshwater into seawater, what will happen?

    Ans : It will rise a little higher
  • 156 What is the first compound which is fixed during photosynthesis?

    Ans : Glucose
  • 157 The escape velocity from the surface of the earth does not depend on which body?

    Ans : Mass of the body
  • 158 Which is the most unreactive gas?

    Ans : Hydrogen
  • 159 Which causes the disease syphilis?

    Ans : Bacteria
  • 160 Which worm reach into intestine of human by eating leaf?

    Ans : Tape worm
  • 161 Energy produced in nuclear reaction is given by?

    Ans : Einstein’s law
  • 162 In atomic reactors, graphite is used as?

    Ans : Moderator
  • 163 In nuclear reactor, chain reaction is controlled by introducing?

    Ans : Cadmium rod
  • 164 Yellow cake an item of smuggling across border is?

    Ans : Uranium oxide
  • 165 The difference between a nuclear reactor and atomic bomb is that?

    Ans : The chain reaction in nuclear reactor is controlled
  • 166 A radio active substance has a half life of four months. Three-fourth of the substance would decay in?

    Ans : 8 months
  • 167 Formation of cation occurs by?

    Ans : Gain of electron
  • 168 Discovery of the nucleus of an atom was due to the experiment carried out by?

    Ans : Rutherford
  • 169 The concept of dual nature of radiation was proposed by?

    Ans : De-Broglie
  • 170 The atomic orbital is?

    Ans : The region in which there is maximum probability of finding electron
  • 171 Which orbit is Dum-bell shaped?

    Ans : p-orbital
  • 172 Meson was discovered by?

    Ans : Yukawa
  • 173 The photoelectric effect is described as the ejection of electrons from the surface of a metal when?

    Ans : Light of suitable wavelength falls on it
  • 174 The charge on positron is equal to the charge on?

    Ans : Proton
  • 175 Positive ions are formed from neutral atoms by loss of?

    Ans : Electrons
  • 176 Cathode rays are?

    Ans : Stream of electrons
  • 177 How many electrons are there in Na+?

    Ans : 10
  • 178 How many moles are there in 140 g of Si(atomic mass of silicon is 28)?

    Ans : 5
  • 179 Nuclear particles responsible for holding all nucleons together are?

    Ans : Mesons
  • 180 Cathode rays can be deflected by?

    Ans : Both types of fields

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