NCERT solutions for Science

 NCERT solution > class 7th  > Science   NCERT solution for class 7th  //Science  // Chapter 5 . Acid ,Bases and Salt Chapter 5 . Acid , Bases and Salt  Exercise  Q1. State differences between acids and bases  Answer -   Q2. Ammonia is found in many household products such as window cleaners it turns red litmus blue what is its nature? Answer -    Ammonia is basic in nature and it turns the colour of red litmus paper into blue Q3. Name the sources from which litmus solution is obtained what is the use of the solution ?  Answer   Litmus solution is obtained from a natural dye extracted from lichen is dissolved in distilled water and perform litmus solution  Litmus identify both the solution acidic as well as basic in acidic solution it shows red colour while in basic solution is shows blue colour and in neutral solution there is no change Q4. Is the distilled water acidic basic or neutral how would you ...

 NCERT solutions   >  Class 7 > Science  NCERT solution for class 7th //Science // Chapter 4 - Heat Chapter 4 - Heat Exercise  Q1 State similarities and differences between the laboratory thermometer and the clinical thermometer  Answer  Similarities  Both thermometer use Celsius scale on the glass tube  In both a thermometer contain Mercury it bulb Both thermometer consists of a long narrow glass tubes In both thermometer have a bulb at one end  Differences  Clinical thermometer has a kink near to the bulb while in laboratory thermometer it is absent  Clinical thermometer reads the temperature range 35 °C to 45 °C while the range of laboratory thermometer is -10 °C to 110°C degree Q2. Give examples each of conductors and insulators of heat  Answer  Conductor of heat  - Aluminium ,Iron ,Copper .  Insulator of heat  - Wood , Plastic  Q3. Fill in the blanks   a) The hotness of an obje...

 NCERT solutions  > Class 10 > Science  NCERT solution for class 10th  // Science  // Chapter 3  -Metals and nonmetals  Chapter 3  -Metals and nonmetals                               Page number 40  Q1. Give an example of a metal which is a liquid at room temperature can be easily cut with a knife  a) Is the best conductor of heat   b) Is a poor conductor of heat  Answer  Mercury sodium silver Lead Q2. Explain the meaning of malleable and ductile  Answer-  Malleable  A substance for material which can be beaten into thin sheets is called malleability metals are good malleable metals like silver and gold are converted into a very thin sheet  Ductile  A substance is a capable of beaten into draw being drawn into thin wires is called ductility. Metals are good ductile metal like  gold and silver ...

 NCERT solutions > class 8 science chapter 4 materials metals and nonmetals NCERT solution for class 8  // Science // Chapter 4 -Materials - Metals and Nonmetals Chapter 4 -Materials - Metals and Nonmetals Q1. Which of the following can be beaten into thin sheets  a) Zinc.  b)  Phosphorus   c) Sulphur.  d)  Oxygen  Answer - Zinc Q2. Which of the following statement is correct  a) All metals are ductile  b) All non metals are ductile   c) Generally metals are ductile  d) Some  non metals are ductile   Answer -  Generally metals are ductile Q3. Fill in the blanks  a) Phosphorus is a very ------- nonmetal. b) Metals are ------ conductor of heat and ------ c) Iron is ------- reactive than copper. d) Metals react with acid to produce---------- gas Answer   a) Phosphorus is a very reactive nonmetal. b) Metals are good conductor of heat and electricity.  c) Iron is more reacti...