Basic Information of Daily Science Inventions and
176. One of the following metals, which one pollutes the air of a busy city?
- ক. lead
- খ. copper
- গ. cadmium
- ঘ. chromium
উত্তরঃ lead
177. Which one of the following is not a plantation crop?
- ক. rubber
- খ. sugarcane
- গ. coffee tea
- ঘ. all of these
উত্তরঃ sugarcane
178. Which one of the following gases is not a greenhouse gas?
- ক. nitrous oxide
- খ. methane
- গ. chloroflurocarbons
- ঘ. carbon dioxide
উত্তরঃ nitrous oxide
181. Which of the following is not a constituent of the atmosphere?
- ক. nitrogen
- খ. carbon dioxide
- গ. aluminium
- ঘ. oxygen
উত্তরঃ aluminium
182. A barometer is used for measuring--
- ক. annual rainfall
- খ. humidity
- গ. atmospheric pressure
- ঘ. temperature
উত্তরঃ atmospheric pressure
183. On burning charcoal which of the following gases is produced?
- ক. nitrous oxide
- খ. hydrogen
- গ. carbon dioxide
- ঘ. oxygen
উত্তরঃ carbon dioxide
185. Which one of the following is not a noble gas?
- ক. argon
- খ. krypton
- গ. hydrogen
- ঘ. helium
উত্তরঃ hydrogen
186. Which of the following is necessary for a substance to burn?
- ক. gasoline
- খ. hydrogen
- গ. oxygen
- ঘ. light
উত্তরঃ oxygen
187. When we breathe which of the following gases do we use?
- ক. carbon dioxide
- খ. hydrogen
- গ. oxygen
- ঘ. helium
উত্তরঃ oxygen
188. Which gas in the atmosphere saves us from the UV rays of the sun?
- ক. oxygen
- খ. carbon monoxide
- গ. ozone
- ঘ. nitrogen
উত্তরঃ ozone
189. Dry ice is--
- ক. ice with salt added
- খ. any frozen liquid
- গ. solid carbon dioxide
- ঘ. very cold ice
উত্তরঃ solid carbon dioxide
190. What is the name given to the respiratory holes on the surface of a leaf?
- ক. tendrils
- খ. pits
- গ. stomata
- ঘ. chlorophyll
উত্তরঃ stomata
191. The lower, dense region of the atmosphere is known as--
- ক. stratosphere
- খ. hydrosphere
- গ. troposphere
- ঘ. inosphere
উত্তরঃ troposphere
192. A space that contains no air or any gas is known as--
- ক. vavuum
- খ. hollow
- গ. pressurized cabin
- ঘ. bubble
উত্তরঃ vavuum
193. The center of the earth is known as the--
- ক. hydrosphere
- খ. core
- গ. crust
- ঘ. atmosphere
উত্তরঃ core
194. The length of the days and nights is equal at the--
- ক. south pole
- খ. tropic of capricorn
- গ. equator
- ঘ. north pole
উত্তরঃ equator
195. Removal of the top layer of soil/rocks by wind, water is known as--
- ক. desalination
- খ. detoxification
- গ. erosion
- ঘ. corrosion
উত্তরঃ erosion
196. Natural hot water springs occuring in New Zealand, Italy and Iceland are known as--
- ক. old faithfuls
- খ. fountains
- গ. geysers
- ঘ. hot bubbles
উত্তরঃ geysers
197. What is the name given to molten rocks that are erupted by a volcano?
- ক. lava
- খ. slate
- গ. firestone
- ঘ. marble
উত্তরঃ lava
198. The surface of the earth is mainly covered with--
- ক. ice
- খ. mountains
- গ. land
- ঘ. oceans
উত্তরঃ oceans
- ক. organic matter
- খ. lave
- গ. rocks
- ঘ. soil
উত্তরঃ organic matter