Solved Paper Laboratory Assistant 2018 [Part-3] – HPSSC Hamirpur

111. A virtual image larger than the object can be produced by

1. Concave mirror
2. Convex mirror
3. Plane mirror
4. Concave lens

112. The blue colour of the sky is due to the phenomenon of

1. Reflection
2. Refraction
3. Scattering
4. Dispersion

113. The radioactive isotope used to study thyroid gland is

1. Carbon
2. Cobalt
3. Iron
4. Iodine

114. Which of the following is not a semiconductor?

1. Germanium
2. Silicon
3. Arsenic
4. All of these

115. What is the mass percent of carbon in carbon dioxide?

1. 27.27%
2. 28.80%
3. 0.034%
4. 4.4%

116. The number of atoms in 4.25 g of NH3 is approximately

1. 1*10^23
2. 2*10^23
3. 4*10^23
4. 6*10^23

117. The radio-isotope of hydrogen is

1. Hydrogen ion
2. Protium
3. Deuterium
4. Tritium

118. Isoelectronic species are

1. F-, O^2-
2. F-,O
3. F-,O+
4. F-,O^2+

119. Which of the following has the non-spherical orbital for the electron?

1. He
2. B
3. Be
4. Li

120. The number of groups in the periodic table are

1. 10
2. 14
3. 16
4. 18

121. Which of the following has the smallest size?

1. N^3-
2. O^2-
3. F^-
4. Na^+

122. Which of the following is the weakest bond?

1. Covalent bond
2. Ionic bond
3. Metallic bond
4. Van der Waals’ forces

123. Which of the following is linear?

1. C2H2
2. CH4
3. H2O
4. NH3

124. The surface tension of which of the following liquids is the maximum?

1. C2H5OH
2. CH3OH
3. H2O
4. C6H6

125. The compressibility factor for an ideal gas is

1. 1.0
2. 1.5
3. 2.0
4. Infinity

126. Graphite cannot be classified as

1. Conducting solid
2. Network solid
3. Covalent solid
4. Ionic solid

127. Amorphous solid can also be called

1. Pseudo solids
2. True solids
3. Super cooled liquids
4. Both a and c

128. The number of carbon atoms in a unit cell of diamond is

1. 1
2. 4
3. 8
4. 12

129. Which has a Frenkel defect?

1. Sodium chloride
2. Graphite
3. Silver bromide
4. Diamond

130. The material used in a solar cell contains

1. Cr
2. Si
3. Sn
4. Ti

131. The change in entropy of an ideal gas during the reversible isothermal expansion is

1. Negative
2. Positive
3. Zero
4. Infinity

132. According to Lewis is concept, an acid is

1. Proton donor
2. Electron pair donor
3. Electron pair acceptor
4. Proton acceptor

133. The oxidation number of Cl in HClO4 id

1. +1
2. +3
3. +5
4. +7

134. Hydrogen peroxide acts as

1. An oxidizing agent
2. A reducing agent
3. An acid
4. All of these

135. Pure water is obtained from seawater by

1. Centrifugation
2. Plasmolysis
3. Reverse osmosis
4. Sedimentation

136. The permanent hardness of water can be removed by adding

1. Soda lime
2. Sodium bicarbonate
3. Washing soda
4. Sodium chloride

137. Which of the following gas is lightest?

1. Oxygen
2. Ammonia
3. Hydrogen
4. Helium

138. Dead burnt plaster is

1. CaSO4
2. 1/2H2O
3. H2O
4. 2H2O

139. Which of the following metals cannot give flame test?

1. Be
2. Na
3. K
4. Ca

140. Dry ice is

1. Solid NH3
2. Solid SO2
3. Solid CO2
4. Solid N2

141. Maximum covalency of nitrogen is

1. 3
2. 4
3. 5
4. 6

142. The hybridization of nitrogen in R2NH is

1. Sp
2. Sp2
3. Sp3
4. Dsp2

143. Methyl alcohol and acetone can be separated by

1. Fractional distillation
2. Distillation
3. Steam distillation
4. Vacuum distillation

144. The molecular mass of a volatile substance is determined by

1. Kjeldahl’s method
2. Duma’s method
3. Victor Meyer’s method
4. Liebig’s method

145. The compound having only primary hydrogen atoms is

1. Benzene
2. 2,3 dimethyl butane
3. Cyclohexane
4. Propyne

146. Which of the following can show geometrical isomerism?

1. But-2-ene
2. Isobutene
3. But-I-ene
4. None of these

147. The acids present in acid rain is/are

1. H2CO3
2. HNO3
3. H2SO4
4. All of these

148. Which is not a source of pollution?

1. Forest fire
2. Coal fire
3. Volcanoes
4. Dust storm

149. Photochemical smog is formed due to the presence of

1. Oxides of sulphur
2. Oxides of nitrogen
3. Oxides of carbon
4. Oxides of lead

150. Percentage of free space in a body centered cubic unit cell is

1. 34%
2. 28%
3. 30%
4. 32%

151. Diamond is

1. A covalent solid
2. Non-conductor
3. A lubricant
4. All of these

152. Isotonic solutions have same

1. Molar concentration
2. Molality
3. Normality
4. None of these

153. Weight of Urea required to prepare 200ml of a 2M solution is

1. 12g
2. 24g
3. 20g
4. 60g

154. Which of the following is not affected by temperature?

1. Molarity
2. Molality
3. Normality
4. None of these

155. The quantity of charge required to obtain one mole of aluminium from Al2O3 is

1. 1F
2. 6F
3. 3F
4. 2F

156. Which of the following is not used to determine cell constant?

1. 10^-2 MCl
2. 10^-1MKCl
3. 1MKCl
4. Saturated KCl

157. The reaction :H^+ +OH^—- H2O is

1. Very slow
2. Slow
3. Fast
4. Moderate in speed

158. A biological catalyst is essentially

1. An enzyme
2. A carbohydrate
3. An amino acid
4. A nitrogenous base

159. Protective sols are

1. Lyophilic
2. Lyophobic
3. Both A and B
4. None of these

160. The important ore of iron is

1. Siderite
2. Haematite
3. Pyrites
4. Bauxite

161. Maximum covalency of nitrogen is

1. 3
2. 4
3. 5
4. 6

162. Number of sigma bonds in P4O10 is

1. 6
2. 7
3. 17
4. 16

163. Which of the following alloys contain copper and zinc?

1. Bronze
2. Brass
3. Gun metal
4. Both b and c

164. Which of the following has magnesium?

1. Chlorophyll
2. Haemocyanin
3. Carbonic anhydrase
4. Vitamin B12

165. IUPAC name of acryaldehyde is

1. Prop-2-enal
2. Propenyladehyde
3. But-2-enal
4. Propenal

166. The compounds used as a refrigerant are

1. H3
2. CCl4
3. CF4Cl2
4. Both a and c

167. Aspirin is known as

1. Acetyl salicylic acid
2. Phenyl salicylate
3. Acetyl salicylate
4. Methyl salicylic acid

168. Which type of isomerism is shown by pentanone?

1. Chain isomerism
2. Position isomerism
3. Functional isomerism
4. All of these

169. Which of the following can distinguish phenol and benzoic acid?

1. Tollen’s reagent
2. Molisch reagent
3. Neutral FeCl3
4. Aqueous NaoH

170. Which of the following is more basic than aniline?

1. Benzylamine
2. Diphenylamine
3. Triphenylamine
4. P-nitroaniline

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