152What structure is common to both earthworm and cockroach?
Ans : Ventral nerve cord
153Which communicable disease is caused by bacteria?
Ans : Leprosy
154What is the conversion of Fe++ to Fe+++?
Ans : Oxidation
155If a ship moves from freshwater into seawater, what will happen?
Ans : It will rise a little higher
156What is the first compound which is fixed during photosynthesis?
Ans : Glucose
157The escape velocity from the surface of the earth does not depend on which body?
Ans : Mass of the body
158Which is the most unreactive gas?
Ans : Hydrogen
159Which causes the disease syphilis?
Ans : Bacteria
160Which 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
162In atomic reactors, graphite is used as?
Ans : Moderator
163In nuclear reactor, chain reaction is controlled by introducing?
Ans : Cadmium rod
164Yellow cake an item of smuggling across border is?
Ans : Uranium oxide
165The difference between a nuclear reactor and atomic bomb is that?
Ans : The chain reaction in nuclear reactor is controlled
166A radio active substance has a half life of four months. Three-fourth of the substance would decay in?
Ans : 8 months
167Formation of cation occurs by?
Ans : Gain of electron
168Discovery of the nucleus of an atom was due to the experiment carried out by?
Ans : Rutherford
169The concept of dual nature of radiation was proposed by?
Ans : De-Broglie
170The atomic orbital is?
Ans : The region in which there is maximum probability of finding electron
171Which orbit is Dum-bell shaped?
Ans : p-orbital
172Meson was discovered by?
Ans : Yukawa
173The photoelectric effect is described as the ejection of electrons from the surface of a metal when?
Ans : Light of suitable wavelength falls on it
174The charge on positron is equal to the charge on?
Ans : Proton
175Positive ions are formed from neutral atoms by loss of?
Ans : Electrons
176Cathode rays are?
Ans : Stream of electrons
177How many electrons are there in Na+?
Ans : 10
178How many moles are there in 140 g of Si(atomic mass of silicon is 28)?
Ans : 5
179Nuclear particles responsible for holding all nucleons together are?
Ans : Mesons
180Cathode rays can be deflected by?
Ans : Both types of fields
"In our desire to impose form on the world and our lives we have lost the capacity to see the form that is already there; and in that lies not liberation but alienation, the cutting off from things as they really are"