Physics - Form 1 End Term 2 Exams 2021 Questions and Answers

1. Give two career opportunities in physics. (2 mks)
2. Give three basic laboratory rules. (3mks)
3. State with a reason what will happen to the diagram if side A is broken with a needle, and draw the final diagram (4mks)
   
4. What is the first aid measure for the following accidents in the laboratory.
   
   1. Cuts. (3mks)
   2. Burns. (3mks)
   3. Electric shock (3mks)
5. Study the diagram bellow and indicate on the diagram the right position of the eye when taking the measurements. (3mks)
   
6. Estimate the height of the tree below. (5mks)
   
7. Estimate the area of the irregular surface shown in the figure below. (4mks)
   
8. The density of a material is 22.5gcm^-3 .Express this in SI units. (3mks)
9. Give 3 effects of a force. (6mks)
10. It is observed that the pollen grains are in constant motion. Explain the observation. (4mks)
    
11. In a hydraulic press,a force of 200N is applied to master piston of area 25cm². If the press is designed to produce a force of 5000N, determine;
    
    1. The area of the slave piston. (4mks)
    2. The radius of the slave piston. (4mks)
12. Explain why the walls and ceiling boards painted white. (3mks)
13. Explain the greenhouse effect and how it affects the earth. (4mks)
14. The ventilations for a room are put near the roof and not near the floor. Explain (4mks)
15. Explain how temperature affects Brownian motion. (4mks)
16. Pressure is affected by many factors,study the diagram below and give reasons for such effects. (4mks)
    
17. The ball shown below is bigger than the ring, explain an experiment to enable the ball pass through the ring. (5mks)
    
18. A brick 20cm long,10cm wide and 5cm thick has a mass of 500g.Determine the: (Take g=10Nkg-1)
    
    1. greatest pressure that can be exerted by the brick on a flat surface. (3mks)
    2. Least pressure that can be exerted by the brick on a flat surface. (2mks)

Marking Scheme

1.  
   • Bachelor of arts (Building economics)
   • Architecture
   • Medicine
2.  
   • no running in the laboratory
   • No eating in the lab.
   • No performance of unauthorized experiments
3. It will curve towards the otherside.
   The Surface Tension on the otherside will pull the string.
4. Measures to be taken.
   
   1. Cuts - Pressure or direct compression should be applied directly to the wound and proper dressing applied.
   2. Burns - Flushing cold water over the affected areas.
      Acid burns to be treated with sodium hydrogen carbonate.
   3. Electric shock - cut off the current causing the shock. Turning off the current at the main switch.
5. B
6. ¹⁸⁰/₁₁₆=^h/₈₄₀
   H=1,303.45cm
7. Estimate the area of the irregular surface
   No of complete squares + half number of incomplete squares.
8. ^22.5/₁₀₀₀x1,000,000/1=22,500KGM^-3
9.  
   • Set a stationary objects into motion
   • Accelerate a moving objects
   • Stop a moving objects.
10. The pollen grains are hit by invisible air particles which are constantly in         motion.
11.  
    1. F1/A1=F2/A2
       200/25=5000/A₂
       A₂=625CM²
    2. A₂=625cm²
       22/7r²=625
       R=25cm.
12. White surfaces are good reflectors of heat and light.
13. Emission of industrial gases into the atmosphere. Caurses global warming.
14. Warm air rises due to low density.Cold fresh air are dense hence get into the room through the lower part of the door.
15. The higher the temperature the higher the rate of the movement of the smoke       particles and vise versa.
16. The area of contact affects pressure.The smaller the contact area the greater the pressure and vise versa holding all other factors constant.
17. when the ring is heated,it expands hence the ball can pass through.
18.  
    1. 1000Nm²
    2. 250Nm²