Important Questions for CBSE Class 9 Science Chapter 14 Natural Resources IMPORTANT QUESTIONS 1-MARK QUESTIONS Question.1 Name the three processes in which oxygen is used. Answer. Combustion, respiration and in the formation of oxides of nitrogen. Question.2 Name two natural resources available on the earth. [SAII -2014] Answer. Water and air. More Resources for … [Read more...]
Important Questions for CBSE Class 9 Science Sound
Important Questions for CBSE Class 9 Science Chapter 12 Sound IMPORTANT QUESTIONS 1 MARK QUESTIONS Question.1 What is SONAR? [SAII-2014] Answer. SONAR (Sound Navigation And Ranging) is a technique for determining water depth and locating underwater objects, such as reefs, submarines, and schools of fish. Question.2 Define one hertz. [SAII-2013] Answer. One hertz is … [Read more...]