Physics - Maranda High School Form 1 End Term 1 2018

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232/COMPOSITE
PHYSICS
FORM ONE 2018
TIME: 2HRS

MARANDA HIGH SCHOOL
END TERM ONE EXAM 2018

INSTRUCTIONS TO CANDIDATES

• This paper consist of Two sections; A and B
• Answer ALL the questions in section A and B in the spaces provided.
• All tables and Electronic calculators may be used.

Take g = 10N/kg

SECTION A; Answer all questions in this section

1.  
   1. What is surface tension? (1 mk)
   2. Figure 3 below shows a funnel dipped into a liquid soap solution.
      
      
      
      Explain what happens to the soap bubble when the funnel is removed (2mk)
2. 50 drops of a liquid were released from a burette which was originally reading 22cm³ to give a new reading of 56cm³. Calculate the volume of each drop. (2mks)
3. A sphere of diameter 4.5cm is molded into a thin uniform wire of diameter 0.15mm; calculate the length of the wire in meters. (Take π = ²²/₇) (3mks)
4. The diagram below shows a wire loop with two threads tied across it. The loop is dipped into a soap solution such that the soap film covers it as shown.
   
   
   
   Region B is punctured such that the soap film in that section is broken. On the space alongside the diagram sketch the resulting shape of the wine loop. Give a reason for the shape (2mks)
5. A uniform mixture consists of 30cm³ of water and 40cm³ of ethanol. If the densities of water and ethanol are 1g/cm³ and 0.85g/cm³ respectively. Determine the density of the mixture. (3mks)
6. Two identical spring balances A and B each weighing 0.8N are arranged as shown below.
   
   
   
   What are the readings of A and B? (2mks)
7.  
   1. Differentiate between scalar and vector quantities (1 mk)
   2. State two examples of scalar quantities (2 mks)
8. Figure 2 shows water placed in a measuring cylinder calibrated in cm³
   
   An object of mass 50.1g and density 16.7 g/cm³ is lowered gently in the water. Indicate on the diagram the new level (2mks)
9. An object is attached to a spring balance and its weight determined in air. It is then gently lowered into a liquid in a beaker. State what will happen to the reading (1 mk)
10. A butcher has a beam balance and masses 0.5 kg and 2 kg. How would he measure 1.5 kg of meat on the balance at once? (2 mks)
11. A thin wire was wound 30 times closely over a boiling tube. The total length of the windings was found to be 9.3mm. Calculate the radius of the wire (2mks)

SECTION B: Answer all the questions in this section

12.  
    1. Define force and give its SI unit (2 mks)
    2. Differentiate between cohesive force and adhesive force (2mks)
    3. Explain how increase in temperature affects surface tension (2mks)
    4. Explain why a drop of oil spreads on a water surface (2mks)
    5. An astronaut weighs 900N on earth. On the moon, he weighs 150N. Calculate the moon's gravitational strength. (Take g=10Nkg^-1) (3mks)
13.  
    1. State two types of non-contact forces (2mks)
    2. A body weighs 100N in air and 80N when submerged in water. Calculate the uptrust acting on the body in water (2mks)
    3. The diagram below shows sets of tubes dipped inside a basin of water. Explain why the level of water is higher in tube A than in tube B. (2mks)
       
       
       
       
       
    4. State three ways of reducing frictional force between two moving bodies (3mks)
    5. Define the term 'Resultant Vector' as used in force. (1mk)
    6. The figure below shows a body of mass m acted upon by different forces. On the space provided sketch the final resultant force on the body (2mks)
       
       
       
       
14. In an experiment to determine the density of sand using a density bottle, the following measurements were recorded;
    
    Mass of empty density bottle = 43.2g 
    Mass of density bottle full of water = 66.4g
    Mass of density with some sand = 67.5g
    Mass of density bottle with the sand filled up with water 82.38
    
    Use the above data to determine the;
    
    1. Volume of water that completely filled the bottle; (3mks)
    2. The volume of the density bottle; (1 mk)
    3. Volume of water that filled the space above the sand (2mks)
    4. Mass of the sand (2mks)
    5. Volume of the sand (2mks)
    6. Density of the sand (2mks)
    7. State two precautions that should be taken while using a density bottle (2mks)
15.  
    1. Explain how physics is related to Biology as a subject. (2mks)
    2. Differentiate between metre rule and metre ruler (1mk)
    3. State the accuracy level of a metre ruler. (1 mk)
    4. A form one student from Maranda High School was burnt with an acid in the laboratory while taking out an experiment. Give one fist aid measures he should take. (1 mk)
    5. Highlight two major systems that must be installed in a laboratory for efficient functioning (2mks)
    6. Estimate the area of the irregular surface shown below by counting the small squares. (3mks)
       
       
       
       
16.  
    1. Define pressure and state its SI unit (2mks)
    2. A block of copper of density 8.9gcm^-3 measures 5cm by 3.5cm by 2.1 cm. Given that the force of gravity is 10Nkg^-1, Calculate,
       1. The maximum pressure exerted by the block on the floor (4mks)
       2. The minimum pressure that it can exert. (2mk)