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You Are On Multi Choice Question Bank SET 1602
80101. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is
(A): 1.568 x 103 (B): 6.023 x 1019 (C): 4.84 x 1017 (D): 6.023 x 1023
80102. The most malleable metal is
(A): platinum (B): silver (C): iron (D): gold
80103. The oil used in the froth floatation process is
(A): coconut oil (B): olive oil (C): kerosene oil (D): pine oil
80104. The number of waves in n x 10th Bohr's orbit are
(A): n2 (B): n (C): n-2 (D): n3
80105. The mass of one Avogadro number of helium atom is
(A): 1.00 gram (B): 4.00 gram (C): 8.00 gram (D): 4 x 6.02 x 1023 gram
80106. The items amenable to detection by soft x-rays are
(A): contrabands (B): lead in bullets (C): narcotics (D): genuine coins from counterfeit coins
80107. The material which can be deformed permanently by heat and pressure is called a
(A): thermoplastic (B): thermoset (C): chemical compound (D): polymer
80108. The mass number of a nucleus is
(A): always less than its atomic number (B): the sum of the number of protons and neutrons present in the nucleus (C): always more than the atomic weight (D): a fraction
80109. The inexpensive and commonly used variety of glass is called soda glass. It is called so because
(A): was used initially for making bottles of soda(carbonated drink) (B): is made using soda(sodium carbonate) (C): was initially used for storing sodium carbonate (D): is made using soda lime
80110. The gas used in the manufacture of vanaspati from vegetable oil is
(A): hydrogen (B): oxygen (C): nitrogen (D): carbon dioxide
80111. The ionic radii of N3-, O2-, F- and Na+ follows the order
(A): N3- > O2- > F- > Na+ (B): N3- > Na+ > O2- > F- (C): Na+ > O2- > N3- > F- (D): O2- > F- > Na+ > N3-
80112. The graphite rods in the nuclear reactor
(A): react with U to release energy (B): produce neutrons (C): undergo combustion which triggers the nuclear fission (D): convert fast moving neutrons into thermal neutrons
80113. The first metal used by man was
(A): iron (B): copper (C): gold (D): bronze
80114. The hydronium ion is
(A): H+ (B): HO - (C): H2+ (D): H3O+
80115. The most electropositive elements among the following is
(A): Na (B): Ca (C): K (D): Cs
80116. The method that cannot be used for removing permanent hardness of water is
(A): adding sodium carbonate (B): distillation (C): adding caustic soda (D): boiling
80117. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
(A): 3 billion years (B): 100 years (C): 0.01 minute (D): 13 days
80118. The gas used for artificial ripening of green fruit is
(A): ethylene (B): ethane (C): carbon dioxide (D): acetylene
80119. Zone refining is used for the purification of
(A): Au (B): Ge (C): Ag (D): Cu
80120. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
(A): cineole (B): engenol (C): geraniol (D): limonene
80121. The molecule which has the highest percentage of ionic character among the following is
(A): HI (B): HF (C): HCI (D): HBr
80122. The high reactivity of fluorine is due to
(A): its high electro negativity (B): small size of fluorine atom (C): availability of d-orbitals (D): strong F - F bond
80123. The iron ore magnetite consists of
(A): Fe2O3 (B): Fe3OH4 (C): FeCO3 (D): 3Fe2O3 .. 3H2O
80124. The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
(A): 5x/36 (B): 5x (C): 7.2 x (D): x/6
80125. The main chemical constituent of clay is
(A): silicon oxide (B): aluminium borosilicate (C): zeolites (D): aluminium silicate
80126. The mineral containing both magnesium and calcium is
(A): magnesite (B): calcite (C): carnallite (D): dolomite
80127. The metal does not give H2 on treatment with dilute HCL is
(A): Zn (B): Fe (C): Ag (D): Ca
80128. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is
(A): 1 gram of molecule (B): 0.5 gram of molecule (C): 5 gram of molecule (D): 10 gram of molecule
80129. The most extensive, commercially useful source of thorium as monazite sand occurs in India at
(A): Orissa coast (B): Travancore coast (C): West Bengal coast (D): Gujarat coast
80130. The main active constituent of tea and coffee is
(A): nicotine (B): chlorophyll (C): caffeine (D): aspirin
80131. The maximum number of isomers for an alkene with molecular formula C4H8 is
(A): 5 (B): 4 (C): 2 (D): 3
80132. The hardest form of carbon is
(A): coke (B): graphite (C): diamond (D): charcoal
80133. The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of
(A): an addition reaction (B): a condensation reaction (C): an oxidation reaction (D): an elimination reaction
80134. The number of electrons presents in H+ is
(A): zero (B): one (C): two (D): three
80135. The hottest part of the gas flame is known as
(A): luminous zone (B): dark zone (C): blue zone (D): non-luminous zone
80136. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
(A): carbon (B): hydrogen (C): oxygen (D): nitrogen
80137. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
(A): chain isomerism (B): functional group isomerism (C): positional isomerism (D): metamerism
80138. The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
(A): 1/6 (B): 1/3 (C): 1/8 (D): 1/4
80139. The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
(A): 4 (B): 5 (C): 2 (D): zero
80140. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
(A): 1.8 gram of H2O (B): 12 moles of KMnO4 (C): 0.6N H2SO4 (D): 4.6 gram of C2H5OH
80141. The National Chemical Laboratory is situated in
(A): New Delhi (B): Bangalore (C): Pune (D): Patna
80142. Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
(A): 2 : 16 : 2 (B): 2 : 16 : 1 (C): 1 : 16 : 2 (D): 1 : 1 : 1
80143. The mass number of an atom is equal to
(A): the number of protons (B): the number of protons and electrons (C): the number of nucleons (D): the number of neutrons
80144. The maximum number of covalent formed by nitrogen is
(A): 1 (B): 2 (C): 3 (D): 4
80145. The formula C6H5-CO-CH3 represents
(A): Acetone (B): Acetic acid (C): Acetophenone (D): Phenyl acetate
80146. The metal that is usually extracted from sea water is
(A): Ca (B): Na (C): K (D): Mg
80147. The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
(A): liquation (B): leaching (C): levigation (D): magnetic separation
80148. The inert gases are ____ in water
(A): sparingly soluble (B): insoluble (C): soluble (D): None of these
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