Question: Name the three processes in which oxygen is used. Answer: Combustion, respiration and in the formation of oxides of nitrogen. Question: Name two natural resources available on the earth. Answer: Water and air. Question: Give one example of biotic component of the biosphere. Answer: All animals, plants and micro …

NCERT 9th Class (CBSE) Science: Structure of the Atom Quiz 17 Multiple Choice Questions related to NCERT 9th Class (CBSE) Science: Structure of the Atom Quiz Canal rays are positively charged radiations which led to the discovery of positively charged sub-atomic particle called proton. As per Rutherford’s model of an …

Question: What is an election? State its relative mass and charge. Answer: The negatively charged particle found in the atoms of all elements is known as electron. The relative mass of an election is 1/1840 u & charge is – 1 (minus one). Question: What is the absolute mass & …

NCERT 9th Class (CBSE) Science: Sound Quiz 23 Multiple Choice Questions related to NCERT 9th Class (CBSE) Science: Sound Quiz The way our brain interprets the frequency of an emitted sound is called the pitch. The quality or timber of sound helps us to distinguish one sound from another having …

Books are our best friends. They are a food for the mind. They console us sorrow and make us forget the worries of life. Of all the books I have read, I like the Gita most. It is a holy book of the Hindus. It is my true guide and …

NCERT 9th Class (CBSE) Science: Energy and Work Quiz 19 Multiple Choice Questions related to NCERT 9th Class (CBSE) Science: Energy and Work Quiz It states that energy can neither be created nor destroyed. It can only change its form. The winning team does work. The work is equal to …

Sound – 9th Class NCERT CBSE Science Chapter 12 Question: Can sound travel through: Carbon Water Answer: yes yes Question: Can sound travel through vacuum? Answer: No, sound cannot travel through vacuum. Question: Name the type of waves which are used by astronauts to communicate with one another on moon (or in …

Question: Define law of conservation of mass. Answer: In a chemical reaction mass can neither be created nor destroyed. E.g., 2Na + Cl2 —–> 2NaCl 2 x 23 + 2 x 35.5 ——> 2(23 + 35.5) Question: Explain law of constant proportion. Answer: In a chemical substance the elements are always …

संस्कृत और हिन्दी के अनेक सुभाषितों में परोपकार की महिमा गयी है – ‘परोपकाराय सत्तां विभूतयः‘,’पर हित सरिस धर्म नहिं भाई‘ ऐसी ही उक्तियाँ हैं। इनमें कहा गया है कि नदियाँ अपना जल नहीं पीतीं, दूसरों की प्यास बुझाती हैं, रत्नगर्भा पृथ्वी अपने रत्न और अन्य धातुएँ दूसरों के उपयोग …

Question: Does work done depend upon the velocity of the body. Answer: No. Question: State the law of conservation of energy. Answer: It states that energy can neither be created nor destroyed. It can only change its form. Question: In a tug-of-war one team gives way to the other. What …