Integrated Science Questions and Answers - Grade 7 End Term 3 Exams 2023 Set 1

1.  
   1. Grade seven learners were able to give final judgement or decision after making observations in a certain practical lesson. Which scientific skill have they acquired after studying Integrated Science? (1mks)
   2. Name 2 common hazards in the laboratory.  (2mks)
   3. Give the meaning of the following symbols of laboratory hazard. (1mk)
      
2.  
   1. The substance used to clean wounds and kill germs is known as (1mk)
   2. Calculate the density of a metallic block that has a volume of 50cm3 and a mass of 5g. Give your answer in SI Units. (2mks)
3.  
   1. Discuss 2 importances of reading information found on packaging materials of products. (2mks)
   2. Give the use of the following laboratory apparatus.  (1mk)
      1. A dropping funnel
      2. A separating funnel
4.  
   1. What is a mixture? (1mk)
   2. Name two methods of separating mixtures used to separate heterogenous solid-liquid mixtures such as sand and water. (2mks) 
5. 1. Identify the method of separating mixtures shown below   (1mks)
      
   2. The furthest point reached by a solvent labelled K is known as  (1mk)
6.  
   1. Name 3 acid solutions used at home. (3mks)
   2. Fill in the table below  (3mks)
      

      Indicator	Colour in acid	Colour in base
      Litmus paper	______i____	_____ii______
      Phenolphthalein	colourless	Pink
      Methyl orange	Pink	______iii______

   3. Differentiate between a strong acidic solution and a weak acidic solution. (1mks)
7. The diagram below shows a certain process that takes place in the human (4mks) female reproductive system.
          
   1. Identify the process  (1mk)
   2. The embryo will then develop into a  (1mk)
8.  
   1. What is excretion? (1mk)
   2. Give 3 functions of the skin. (3mks)
   3. Name 3 components of urine (3mks)
9. Name 3 kidney disorders (3mks)
10.  
    1. When an object is charged by another charged object without coming into contact it is called charging by (2mks)
    2. When two objects with similar charges are brought close to each other, _____ occurs (3mks)
    3. Give 3 safety measures against lightning.  (3mks)
11. Name two sources of electricity in your environment. (2mks)
12. Identify the following symbols used in electricity. (3mks)
    
    S
    Q.
    R
13. Give 3 examples if materials that can be attracted by a magnet. (3mks)

MARKING SCHEME

1.   
   1. conclusion skill
   2.  
      • corrosive chemicals
      • fire and chemical explosions
   3.  K - open flames
       J -  flammable chemicals
2.  
   1. antiseptic
   2. 100kg/m³
3.  
   1.  
      1. It tells the quantitiy of the product
      2. It helps the expiry date of the products
      3. it tells the benefits of the product
      4. It tells the correct storage of a product
   2.  
      1. Used to add controlled amounts of liquids into a reaction vessel
      2. Used to separate liquids that do not mix
4.  
   1. A mixture is a physical combination of two or more substances that are not chemically united
   2.  
      1. filtartion
      2. decantation
5.  
   1. paper chromatography
   2. solvent front
6.  
   1.  
      • lemon juice
      • vinegar
      • orange juice
      • sour milk
   2.  
      1. red
      2. blue
      3. yellow
   3. Strong acidic solutions have PH values that are below 4 while weak acidic solutions have PH values between 4 and 7
7.  
   1. implantation
   2. foetus
8.  
   1. The removal of metabolic wastes and excess water from the human body
   2.  
      1. protection of the inner part of the body
      2. It makes vitamin D
      3. It excretes waste products
      4. It stores food under it
      5. It acts as a sense organ
   3.  
      1. urea
      2. salts
      3. excess water
9.  
   1. kidney stones
   2. uraemia
   3. nephritis
10.  
    1. induction
    2. repulsion
    3.  
       • Do not carry sharp metallic objects when it is raining
       • Do not walk barefooted in pools of water
       • Do not shelter under trees when it's raining
       • Do not lean on walls when it's raining
       • Do not swim or boating when it's raining
11.  
    1.  solar energy panels
    2. hydroelectric power generators
    3. wind power generators
    4. geothermal power generators
12.   
    • S - battery/dry cells
    • Q - Ammeter
    • R - bulb/lamp
13.  
    1. tin
    2. iron
    3. steel 
    4. cobalt