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Basic Science (Objective) (Pages :27)
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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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