9th Physics:Chapter Sound


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A. Answer these questions 1. Name the three life process help living being to procure energy from food? Answer: Three life processes that help living organisms to procure energy from food are: (i) Digestion (Nutrition) (ii) Respiration (iii) Transportation 2. What are Autotrophs? Name an organism other than other than green plant that is an autotroph. Answer: Autotrophs are organisms that can prepare their own food. Chlamydomonas is a type of green algae which is an example of an autotroph, other than green plants. Cyanobacteria are also an example of autotroph. 3. Name three type of heterotrophic nutrition Answer: Three types of heterotrophic nutrition are: (i) Saprophytic nutrition (ii) Parasitic nutrition (iii) Holozoic nutrition 4. What are enzymes? Answer: Enzymes are chemical substances that act as biological catalysts and are important for carrying out biochemical processes, such as digestion, in our body ...
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CBSE 2014 – 2015 Class 10 SA1 Question Papers are given below. (CBSE 2014 - 2015 Class 10 SA1 Question Papers – Science CBSE 2014 – 2015 Class 10 SA1 Question Papers – Social Science CBSE 2014 – 2015 Class 10 SA1 Question Papers – Maths CBSE 2014 – 2015 Class 10 SA1 Question Papers – Hindi CBSE 2014 – 2015 Class 10 SA1 Question Papers – English CBSE 2014 – 2015 Class 10 SA1 Question Papers – Sanskrit
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Q.1. Draw the graph of 2y = 4x – 6      2x = y+ 3 And determine whether this system of linear equation has a unique solution of not. Q.2. solve the following system of linear equation: 5x – 6y + 30 = 0                      5x + 4y – 20 =0 Find the vertices of the triangle formed by the above two lines and x-axis. Q.3. solve graphically the system of linear equation: 4x – 3y + 4 = 0                        4x + 3y – 20 = 0 Find the area of the region bounded by these lines and x-axis. Q.4. find value of k for which the systems of equation have a unique solution: X – ky = 2                   3x + 2y = -5 Q.5. find value of k for which the systems of e...
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