CBSE ADDA

 Chater 04- Metals and Non Metals Question answer Part 02 Science Mission Book Class 8 Theoretical Questions Answer     JSUNIL TUTORIAL A . Short answer type questions. 1. Give reasons for the following: (a) Phosphorus is stored under water. Ans: Phosphorous is highly reactive with oxygen and catches fire when exposed to air so it is stored in water. (b) Sodium metal is stored under kerosene. Ans:  Sodium combines very quickly with the oxygen in the air and water even at a low temperature; hence it is stored in kerosene. (c) Graphite is used in dry cells. Ans:  Graphite used as electrodes in cells and batteries because it is good conductor of electricity and it does not react with other chemicals. (d) Electric wires are made from aluminium and copper. Ans:  This is because aluminium and copper are ductile and good conductor. (e) Soft iron nail kept in the solution of copper sulphate gets coated with copper. Ans:  Iron from the nails displaces copper from the copper sulphate solution, t

 Metals and Non Metals Question answer of Science Mission Book Class 8 science mission class 8 solutions chapter 4 A. Multiple choice questions 1. Which one of the following is a non-metal? (a) Sodium (b) Potassium (c) Sulphur (d) Platinum                                                           Ans . Sulphur 2. Property of metal to be drawn into wire is known as (a) Malleability (b) Ductility (c) Lustrous (d) Tensile strength                                              Ans. Ductility 3. Property of metal to be beaten into thin sheet is known as (a) Malleability (b) Ductility (c) Lustre (d) Tensile strength                                                Ans. Malleability 4. Metal used in galvanising iron is  (a) Zinc (b) Nickel (c) Tin (d) Aluminium                                                                          Ans. Zinc 5. Which one of the following is a metal? (a) Graphite (b) Iodine (c) Phosphorus (d) Magnesium                                         

  Attempt Quiz 1. The muscular tissue which function throughout the life continuously without fatigue is A. skeletal muscle B. cardiac muscle 2. While doing work and running, you move your organs such as hands, legs, etc., which among the following is correct? A. skeletal muscles contract and pull the tendon to move the bones B. skeletal muscles contract and pull the ligament to move the bones 3. Voluntary muscles are found in A. iris of the eye B. alimentary canal C. bronchi of lungs D. limbs 4. A person met with an accident in which two long bones of hand were dislocated. Possible reason is broken A. Tendon B. Cartilage C. Ligament 5. Bone matrix is rich in A. calcium and phosphorus B calcium and potassium 6. Which of the following helps in repair of tissue and fills up the space inside the organ? A. Adipose tissue B. Areolar tissue 7. Fats are stored in human body in A. Adipose tissue B. Areolar tissue 8. Cartilage is not found in A. Ear B. Nose C. kidney D. Larynx 9. Which is the f

  1. Which of the following statements about the given reaction are correct? 3Fe (s)  + 4H 2 O (g)  => Fe 3 O 4(s)  + 4H 2(g) (i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent (a) (i), (ii) and (iii) (b) (iii) and (iv) (c) (i), (ii) and (iv) (d) (ii) and (iv)   2.In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?  (a) Lead sulphate  (b) Lead acetate  (c) Potassium sulphate 3. A solution of X is used for white washing walls. it reacts slowly with Y in air to form a thin layer of B on walls which gives walls a shiny finish. which of the following options correctly represents X,Y and B ?   a) X =slaked lime , Y = nitrogen , B=calcium oxide b