Integrated Science Questions and Answers - Grade 7 Opener Exams Term 2 2023 Set 3

QUESTIONS

1. List four methods of separating mixtures. (4 mks)
2. Study the hand lens below. Name the parts marked x, y and z. (3 mks)
   
3. Name the use of each of the listed laboratory apparatus.
   1. Test tube (2 mks)
   2. Spatula (2 mks)
4. Below are activities that occur in real life. Write the relevant scientific skill or skills needed for each activity (8 mks)
   

   Activity	Scientific Skill
   a) A houschelp saw dark clouds forming in the sky. He removed all clothes from the drying line and put them in the house.
   b) Grade 7 learners coliected water, brooms and mops. They cleaned their classroom and arranged it.
   c) Grade 7 learners formed a discussion group to talk about handling of laboratory apparatus.
   d) Grade 7 learners were watching a video clip on administering First Aid for a minor cut.

5. Match the scientific apparatus with its correct use.
   

   Apparatus	Use
   a) Spring balance	Measuring the hotness or coldness of a substance.
   b) Stop watch	Measuring the weight of a substance
   c) Thermometer	Getting accurate readings on time.

6.                 
   1. What does SI stand for?
   2. Grade 7 laboratory room measures 1 500cm by 900cm. Calculate its area and give your answer in SI units. (2 mks)
   3. Temperature of water from a tap is 30° C. Give the temperature of the water in SI units. (2 mks)
7. List three importance of reading packaging labels on quantities or products.(3 mks)
8. Briefly outline how to give First Aid for a minor burn or scald. (3 mks)
9. Name five careers related to Integrated Science. (5 mks)
10. The table below shows the common accidents in a laboratory. Write the possible hazard for each accident. (5 mks)
    

    Common Accident	Hazard
    a) Burn
    b) Scald
    c) Falls
    d) Electric shock
    e) Poisoning

11.                   
    1. List two ways of communicating science information.
    2. A learner scored the following marks in KCPE in 2022. (2 mks)
       • Maths - 50%
       • Kiswahili - 60%
       • Social Studies and CRE - 40%
       • English - 70%
       • Science - 80%
         Present this information on a pic chart. (4 mks)

Marking Scheme

1.                
   • Decanting 
   • Filtration
   • Fractional distillation
   • Simple distillation.
   • Use of magnet
   • Sublimation
   • Paper chromatography 
   • solvent extraction
   • Crystallisation (Any 4)
2.                  
   • x lens
   • y-frame
   • z-handle.
3.                    
   1. Test tube-To hold small amounts of susbstances in the laboratory.
   2. Spatula To scoop and transfer small amounts of solids substances.
4.              
   1. Observation, prediction. conclusion
   2. manipulation, observation, communication
   3. communication, manipulation. d) observation, communication
      NB:(If a learner identifies one skill for each activity he/she gets two marks)
5.                  
   1. Spring, balance -Measuring the weight of a substance.
   2. Stop watch getting accurate readings.
   3. Thermometer Measuring the hotness or coldness of a substance.
6.                  
   1. SI International system of units
   2. Solution
      1. 1500 cm = 15 m
          100
      2. 900 cm = 9 m
         100
      3. Area 15m x 9m=135m²
         SI unit for length is metre (m)
   3. Solution
      1. SI unit for temperature is (K) kelvin
      2. To convert degrees celsius (°C) to kelvin (k) we add 273
      3. 30°C+273303k
7.                  
   • Identify correct storage
   • temperature of product.
   • Tell quantity of product.
   • Know expiry date of product
   • Know the ingridients used to make product.
   • Know precautions to observe when using product.
   • Know how to handle or use product.
   • Know benefits of the product
     (Any 3)
     (open more answers can be generated)
8.                
   1. Pour cold water on the burn or scald for about 10 minutes.
   2. Keep the burn or scald open, do not cover it.
   3. Seek medical attention/ tell or inform an adult about the accident.
9.              
   • Civil engineering.
   • Electrical engineering
   • Geospatial engineering
   • Petroleum engineering
   • Chemical engineering
   • Foods and nutrition
   • Nursing
   • Teaching Radiology
   • Lab technician
   • Medicine
   • Surgery
     (any 5) Open-more answers can be generated.
10.                    
    1. Burns-open flames hot objects
    2. Scalds - hot liquid, steam of liquid on skin
    3. falls slippery floor stepping on substances like banana peels etc.sudden pushes from colleagues
    4. Electric shock-touching or stepping on open electric cables or wires.
    5. Poisoning swallowing harmful chemicals or substances.
11.                
    1. Writing a report, publishing journals and books, drawing ple charts tables and graphs.
    2.                        
       1.          
          • Maths 50%
          • Kiswahili 70%
          • English 60%
          • Science 80%
          • Ss/CRE 40%
                         300%
       2.                  
          • ⁵⁰/₃₀₀ x 360 = 60º
          • ⁷⁰/₃₀₀ x 360 = 84º
          • ⁶⁰/₃₀₀ x 360 = 72º
          • ⁸⁰/₃₀₀ x 360 = 96º
          • ⁴⁰/₃₀₀ x 360 = 48º
                                 360º