Physics Questions and Answers - Form 1 Mid Term 1 Exams 2023

• ANSWER ALL THE QUESTIONS

1. Define physics? (1mks)
2. Describe three branches of physics. (6mks)
3. Describe any three relationship between physics and other subjects. (6mks)
4. List five laboratory rules. (5mks)
5. Define length and state its SI units. (2mks)
6. State 2 factors that determine the choice of instrument to measure length. (2mks)
7.  
   1. What is the SI unit for area. (1mk)
   2. Express the following into M2 (4mks)
      1. 9000cm²
      2. 0.05cm²
8. The water level in a burette is 30cm³, 55 drops of water fall from the burette and average volume of one drop is 0.12cm³. What is the final water level in the burette. (3mks)
9.  
   1. Define mass and give its SI units. (2mks)
   2. Covert the following into kilograms (1mk)
      1. 2 tonne
      2. 400 grams
      3. 600mg (millgram)
10. The mass of 20cm³ of wood was found to be 0.4kg. Calculate the density of wood
    1. In kg/m³ (2mks)
    2. In g/cm³ (2mks)
11. How has physics helped in advancement in medicine. (4mks)
12. State four apparatus used in physics laboratory. (4mks)
13. Express each of the following volumes in M³
    1. 27cm³ (2mks)
    2. 11000mm³ (2mks)
14. Define volume and its SI units. (2mks)
15. Define density and state the SI unit (2mks)

MARKING SCHEME

1. Define physics? (1mks)
   • It is the study of matter and relation to energy
2. Describe three branches of physics. (6mks)
   • Mechanics
   • Electricity of magnesium
   • Thermo dynamics
   • Geothermal optics
   • Waves
3. Describe any three relationship between physics and other subjects. (6mks)
   • Physics and region
   • Physics and history
   • Physics and geography
   • Physics and home science
   • Physics biology
   • Physics chemistry
   • Physics and technology
4. List five laboratory rules. (5mks)
   • Tuck in shirts and blouses- gas tap should be closed
   • Wear closed shoes- Wash  hands after experiment
   • Follow instructions and fully
   • Windows and doors should be open when working in the laboratory
   • No eating in the lab
5. Define length and state its SI units. (2mks)
   • Length is a measure of distance between two points. SI unit is metre (M)
6. State 2 factors that determine the choice of instrument to measure length. (2mks)
   • Level of accuracy desired.
   • Size of the object to be measured.
7.  
   1. What is the SI unit for area. (1mk)
      • M²
   2. Express the following into M2 (4mks)
      1. 9000cm²
         1m² = 10000cm²
             ?       9000cm²
                = 0.9m²
      2. 0.05cm²
         10000 → 1m²
         0.05cm²
            0.05    = 0.000005
          10000
8. The water level in a burette is 30cm³, 55 drops of water fall from the burette and average volume of one drop is 0.12cm³. What is the final water level in the burette. (3mks)
   Volume of all drops  = 55 x 0.12
                                    = 6.6cm
   30 − 6.6cm³ = 23.4cm³
9.  
   1. Define mass and give its SI units. (2mks)
      • Mass is quantity of matter in an object. Its SI unit is kilogram.
   2. Covert the following into kilograms (1mk)
      1. 2 tonne
         I tone – 1000kg
         2 tonne – 200kg
      2. 400 grams
         1000g – 1kg
         400gram ?   
          400   =  0.4kg
         1000
      3. 600mg (millgram)
          600   = 0.0006kg
         1000
10. The mass of 20cm³ of wood was found to be 0.4kg. Calculate the density of wood
    1. In kg/m³ (2mks)
       Density =  mass  =       0.4      = 2000kg/m3
                       volume     0.00002
    2. In g/cm³ (2mks)
       0.4 x 1000 =  400g     = 20g/cm³
                            20cm³
11. How has physics helped in advancement in medicine. (4mks)
    • Gamma rays used to destroy body cells
    • Microscopes observes disease causing organisms
    • Stethoscope checks heatbeats
    • Lenses used to correct eye defects
    • X rays used for producing
    • Brain scanner check damage in brain
    • Hearing aids used by people with ear problems
12. State four apparatus used in physics laboratory. (4mks)
    • Ammeter
    • Voltmeter
    • Thermometer
    • Beam balance
    • Metre rule
    • Wires
    • Lenses
    • Mirrors
    • Diodes
    • Resistors
    • Bulbs
    • magnets
13. Express each of the following volumes in M³
    1. 27cm³ (2mks)
       Im³ = 1000000cm³
       ?             27cm³
       0.000027m³
    2. 11000mm³ (2mks)
       1m³ = 1000mm³
          ?      11000mm³
       11cm³
       1m³ = 1000000m³
           ?  = 11000cm
       = 11000  = 0.011m³
14. Define volume and its SI units (2mks)
    • It is the amount of space occupied by matter. SI units metre³
15. Define density and state the SI unit.
    • Density is mass per unit volume of in object. Its SI unit is kilogram per cubic metre. (kgm⁻³ or kg/m³)