Basic Information of Daily Science Inventions and
152. What type of iron is obtained from blast furnace?
- ক. wrought iron
- খ. soft iron
- গ. pig iron
- ঘ. cast iron
উত্তরঃ cast iron
153. Which of the following can be used both as an oxidizing agent and as a reducing agent?
- ক. sodium nitrite
- খ. sodium sulphide
- গ. sodium thiosulphate
- ঘ. sodium nitrate
উত্তরঃ sodium nitrate
154. Which one of the following metals reacts very rapidly with water at room temperature?
- ক. magnesium
- খ. calcium
- গ. beryllium
- ঘ. potassium
উত্তরঃ calcium
155. Which one of the following metals does not react even with boiliing water?
- ক. magnesium
- খ. calcium
- গ. beryllium
- ঘ. potassium
উত্তরঃ beryllium
156. In tritinum, electrons, protons and neutrons are present in the ratio of--
- ক. 1 : 1 : 2
- খ. 1 : 2 : 1
- গ. 1 : 1 : 0
- ঘ. 1 : 1 : 1
উত্তরঃ 1 : 1 : 2
157. What is known as the universal solvent?
- ক. Hydrochloric Acid
- খ. Aqua Regia
- গ. Water
- ঘ. Sulphuric Acid
উত্তরঃ Water
158. Stainless steel is an alloy of iron and--
- ক. nickel, manganese and chromium
- খ. nickel, cobalt and manganese
- গ. nickel and chromium
- ঘ. chromium and tungsten
উত্তরঃ nickel, manganese and chromium
159. What are elements containing the same number of protons but different number of neutrons called?
- ক. compounds
- খ. allotropes
- গ. isotopes
- ঘ. isobars
উত্তরঃ isotopes
160. Which of the following is the only liquid metal?
- ক. Mercury
- খ. Water
- গ. Hydrogen
- ঘ. Chlorine
উত্তরঃ Mercury
161. Which of the following acids is most important in building tissue proteins?
- ক. lactic
- খ. saturated fatty
- গ. linoleic
- ঘ. amino
উত্তরঃ amino
- ক. Carbon Di-oxide
- খ. Hydrogen sulphide
- গ. Oxygen
- ঘ. Nitrogen
উত্তরঃ Hydrogen sulphide
163. Which one of the following nitrogenous fertilizers is not very effective in acidic soils?
- ক. nitrolin
- খ. calcium nitrate
- গ. ammonium sulphate
- ঘ. urea
উত্তরঃ urea
164. What is the correct increasing order of abundance of the main components of air?
- ক. nitrogen, oxygen and argon
- খ. nitrogen, argon and oxygen
- গ. oxygen, nitrogen and argon
- ঘ. argon, nitrogen and oxygen
উত্তরঃ argon, nitrogen and oxygen
165. Dimond and graphite are similar in---
- ক. electric conductivity
- খ. atomic weight
- গ. crystal structure
- ঘ. density
উত্তরঃ atomic weight
166. Which of the following is the most toxic gas?
- ক. nitrogen
- খ. hydrogen
- গ. carbon dioxide
- ঘ. carbon monoxide
উত্তরঃ carbon monoxide
167. Which one of the following contributes largely to the green-house gas effect?
- ক. water vapour
- খ. ozone
- গ. carbon dioxide
- ঘ. carbon monoxide
উত্তরঃ carbon dioxide
168. Which one of the following is an air-pollutant present in the atmosphere?
- ক. nitrogen
- খ. hydrogen
- গ. oxygen
- ঘ. carbon monoxide
উত্তরঃ carbon monoxide
169. Which one of the following crops requires continuous semi-aquatic condition for cultivation?
- ক. sugarcane
- খ. ground nut
- গ. wheat
- ঘ. rice
উত্তরঃ rice
170. Which one of the following is responsible for the depletion of ozone layer?
- ক. PAN
- খ. sulphur oxide
- গ. chloroflurocarbons
- ঘ. methane
উত্তরঃ chloroflurocarbons
171. Which one of the following serves as host tree for silkworm to produce good silk?
- ক. hibiscus
- খ. chrysanthemum
- গ. banyan tree
- ঘ. mulberry
উত্তরঃ mulberry
172. Which of the following was the world's worst industrial disaster?
- ক. Minamata Syndrome
- খ. The Tree Mile Island mishap
- গ. Chernobyl nuclear accident
- ঘ. Bhopal gas tragedy
সঠিক উত্তরের জয় বিস্তারিত দেখুন
174. The increase in carbon dioxide in the atmosphere cause---
- ক. no change in earth temperature
- খ. increase in ultraviolet rays
- গ. rise in earth temperature
- ঘ. fall in earth temperature
উত্তরঃ rise in earth temperature
175. Which of the following soils is very hard to cultivate?
- ক. black
- খ. sandy
- গ. red
- ঘ. alluvial
উত্তরঃ red