Basic Information of Daily Science Inventions and
126. Which of the following is not a radio active metrial?
- ক. plutonium
- খ. sodium
- গ. uranium
- ঘ. radium
উত্তরঃ sodium
127. Which of the following is a unit of pressure?
- ক. Ampere
- খ. Newton
- গ. Pascal
- ঘ. Gauss
উত্তরঃ Pascal
128. Which of the following is a device for storing electric charge?
- ক. compass
- খ. cyclotron
- গ. capacitor
- ঘ. counter
উত্তরঃ capacitor
129. Which one of the completed the 100th anniversary of its discovery in 1995?
- ক. X-rays
- খ. diesel engine
- গ. detergents
- ঘ. photography
উত্তরঃ X-rays
130. Heating element of an electric heater is made up of--
- ক. Chromium
- খ. Nichrome
- গ. Tungsten
- ঘ. Graphite
উত্তরঃ Nichrome
131. Dry sand appears bright while wet sand appears dark because of--
- ক. optical illusion
- খ. diffraction
- গ. reflection
- ঘ. refraction
উত্তরঃ reflection
132. For which of the following purposes is a transformer used?
- ক. measurement of flow of electricity
- খ. conversion of low voltage into high voltage and vice versa
- গ. conversion of DC into AC
- ঘ. regulation of fluctuation of voltage
উত্তরঃ conversion of low voltage into high voltage and vice versa
134. Among the following which is the purest form of iron?
- ক. grey cast iron
- খ. wrought iron
- গ. steel
- ঘ. white cast iron
উত্তরঃ wrought iron
135. Which one of the following forms an irreversible complex with hemoglobin of the blood?
- ক. pure nitrogen gas
- খ. a mixture of carbon dioxide and helium
- গ. carbon monooxide
- ঘ. carbon dioxide
উত্তরঃ carbon monooxide
136. To glavanise iron, iron is coated with which of the followiing?
- ক. galena
- খ. silver
- গ. aluminium
- ঘ. zinc
উত্তরঃ zinc
137. Which one of the following is used for bleaching purposes?
- ক. bromine
- খ. iodine
- গ. fluorine
- ঘ. chlorine
উত্তরঃ chlorine
138. Which gas is present under pressure in soft drinks?
- ক. Carbon Di-oxide
- খ. Nitrous oxide
- গ. Oxygen
- ঘ. Nitrogen
উত্তরঃ Carbon Di-oxide
- ক. lipids
- খ. carbohydrates
- গ. arganic acids
- ঘ. amino acids
উত্তরঃ carbohydrates
140. Which one of the following substances undergoes chemical change on heating?
- ক. lead nitrate
- খ. platinum wire
- গ. sodium chloride
- ঘ. silica
উত্তরঃ lead nitrate
142. By what name is water which contains soluble salts of calcium and magnesium known?
- ক. hard water
- খ. mineral water
- গ. soft water
- ঘ. heavy water
উত্তরঃ hard water
143. Which of the following compound is used in the manufacturing of baking powder?
- ক. calcium oxide
- খ. sodium bicarbonate
- গ. sodium carbonate
- ঘ. silicon carbide
উত্তরঃ sodium carbonate
144. Marble is a changed form of which of the following?
- ক. limestone
- খ. basalt
- গ. graphite
- ঘ. coal
উত্তরঃ limestone
- ক. calcium and potassium
- খ. calsium and magnesium
- গ. calsium and sodium
- ঘ. magnesium and sodium
উত্তরঃ magnesium and sodium
146. Which of the following sulphur compound is used as a bleaching agent in textile industry?
- ক. sulphuric acid
- খ. hydrogen sulphide
- গ. carbon disulphide
- ঘ. sulphur dioxide
উত্তরঃ sulphur dioxide
147. Which of the following compounds are responsible for acid rain?
- ক. nitrogen dioxide and carbon monoxide
- খ. silicon dioxide and carbon monoxide
- গ. nitrogen dioxide and silicon dioxide
- ঘ. nitrogen dioxide and sulphur dioxide
উত্তরঃ nitrogen dioxide and sulphur dioxide
148. Cooking oil is converted into vegetable ghee through which process?
- ক. crystallization
- খ. cracking
- গ. hydrogenation
- ঘ. oxidation
উত্তরঃ hydrogenation
149. Which among the following is a natural polymer?
- ক. terylene
- খ. polyester
- গ. rubber
- ঘ. plastic
উত্তরঃ rubber
150. What are the main constituents of biogas?
- ক. butane and carbon-dioxide
- খ. methane and carbon-monoxide
- গ. methane and carbon-dioxide
- ঘ. ethylene and carbon-dioxide
উত্তরঃ methane and carbon-dioxide