NCERT solutions for Science

  NCERT solution  >Class 7 > Science  NCERT solution for class 7   || Science  || Chapter 10 -Respiration in organisms  Chapter 10- Respiration in organisms  Exercise -   Q1. Why does an athlete breathe faster and deeper than use one after finishing the race?  Answer- Because during the running the muscles of the athlete needs more energy and breathing faster and deeper  more oxygen reaches to the cell and it increases the rate of energy released  Q2. List the similarities and differences between aerobic and anaerobic respiration?  Answer-  Similarities - during both respiration the food is break down into energy  Differences in aerobic and anaerobic respiration  Q3. Why do we often sneeze when we inhale a lot of dust Laden air?   Answer- Sneezing expel the foreign particles from the inhaled air. When we inhaled a lot of dust particle then it create irritation in nasal passage . And th...

 NCERT solution > Class 8 > Science  NCERT solution for class 8 || Science || Chapter 15 - Some natural phenomena Chapter 15 Some natural phenomena  Exercise  Select the correct option in question 1 and 2  Q1. Which of the following cannot be charged easily by friction . a) A plastic scale   b)A copper rod  c) An inflated balloon  d)  A woolen cloth   Answer- A copper rod  Q2. When a glass rod is rubbed with a piece of silk cloth the rod  a)  Cloth both acquire positive charge  b) Becomes positively charged while the cloth has  negative charge. c) And the both cloth  acquire negative charge . d) Becomes negatively charged while the cloth has a positive charge   Answer -b) Becomes positively charged while the cloth has  negative charge. Q3. Write T against true and F against false in the following statement  a) Like charges attract each other  b) A charged glass rod a...

  NCERT solution > Class 8 > Science  NCERT solution for class 8 || Science || Chapter 14 -Chemical effects of electric current Chapter 14 -Chemical effects of electric current  Exercise Q1. Fill in the blanks  a) Most liquids that conduct electricity are solutions of acids and bases and salts   b) The passage of an electric current through a solution causes chemical effects . c) If you pass current through copper sulphate solution copper gets deposited on the plate connected to the negative terminal of the battery. d) The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating   Q2. When the free ends of a tester are dipped in a solution the magnetic needle shows deflection can you explain the reason ?  Answer- The free end of the tester are dipped in the solution of magnetic needle shows deflection because the magnetic needle indicates the electric current is flowing t...

  NCERT solutions  >Class 9 > Science  Chapter 13- Why do we fall ill   Page number 178  Q1. State any two conditions essential for good health ?  Answer -  Two condition essential for good health are  A healthy person is free from all kind of disease  A person should be physically mentally and socially fit is called healthy . Q2. State any two conditions essential for being free of disease ?  Answer - Two conditions essential for being free of disease are  To keep personal hygiene and cleanliness  To get sufficient and balanced food to keep body free from disease  Q3 . Are the answers to the above questions necessarily the same or different why ? Answer-  Both question above mentions have different answer because by the term of health mean mental, physical and social health while free of disease is only related to physical health Page number 180  Q4. List any three reasons why you would think that you...

  NCERT solution > class 6 > Science  Chapter 13 - Fun with magnets  Exercise  Q1. Fill in the blanks in the following.  i) Artificial magnet are made in different shapes such as  H orse shoe and cylindrical ii) The materials which are attracted towards a magnet are called Magnetic materials  iii) Paper is not Magnetic material . iv) In olden days sailor used to find direction by suspending a piece of Magnet   v) A magnet always has Two poles.  Q2. State whether the following statements are true or false  i) Cylindical magnet has only one pole  ii) Artificial magnets were discovered in Greece . iii) Similar poles of a magnet repel each other . iv) Maximum iron filings stick in the middle of the bar magnet when it is brought them near.  v) Bar magnets always point towards north south direction. vi) Compass can be used to find east west direction at any place . vii) Rubber is a magnetic material . Answer - i) fals...

 NCERT solution > Class 6 > Science    NCERT solution for class 6 || Science || Chapter 9 - The living organisms characteristics and habitats Chapter 9 - The living organisms characteristics and habitats  Exercise  Q1. What is a habitat ?  Answer - The surroundings where the plants and animals live is called their habitat . Different plants and animals live in different habitats ex - In terrestrial habitat  land animals live ,In  aquatic habitat water animals live  etc . Q2. How are cactus adapted to survive in a desert  Answer - In following way a cactus adapted to survive in desert   There leaves are in the form of spines reduce transpiration  Stem is thick fleshy and green in colour for photosynthesis   Stem covered with waxy coating  Their roots are go very deep into the soil for absorbing water  Q3. Fill ups the blanks  a) The presence of specific features which enables a plant or ...

NCERT  Solution >Class 9 > Science  NCERT solution for class 9//Science -  Chapter 12 - Sound Chapter 12 -Sound  Page number 162  Q1. How does the sound produced by A vibrating object in a medium reach your ear?  Answer- When an object vibrate  the particles of the medium around it vibrating object from its equilibrium position after displacing the adjacent particles to all over the medium it comes back in its original position this process continuous in a medium the sound reaches  your ear Page number 163  Q2. Explain how sound is produced by your school bell?  Answer - When the bell continuous to move forward and backward then it create the series of the compression and rarefaction and it produced sound Q3. Why are sound waves called mechanical waves ?  Answer- Sound rays propagate only through the material medium so it is called mechanical waves Q4. Suppose you and your friend are on the moon will you be able to hear any s...