Mvunguti day secondary school

Mvunguti day secondary school OUR SCHOOL OUR FUTURE (discipline in action)

01/03/2024

FORM 4 CHEMISTRY: REDUCTION AND OXIDATION (PART 2)

1. With an aid of a well labeled diagram, describe how the voltaic cell works.(10 marks)

2. What is a standard electrode potential?(1 mark)

3. Define the term Electromotive force.(1 mark)

4. Calculate the e.m.f of an electrochemical cell, Zn(s)|Zn2+(aq)||Cu2+| cu(s).(3 marks)

5. Calculate the standard e.m.f of each of the following cells:
A. Ah(s)| Ag+(aq) || Cu2+(aq) | Cu(s).(3 marks)
B. Fe(s) | Fe2+(aq) || Cu2+(aq) | Cu(s).(3 marks)
C. Zn(s) | Zn2+(aq) || Ni2+(aq) | No(s).(3 marks)

6. What does this "||" mean in standard electrode potential?(1 mark)

7. Define the following:
A. Corrosion.(1 mark)
B. Rusting.(1 mark)

8. What is the chemical name for rust?(1 mark)

9. What are the conditions necessary for rusting to occur?(3 marks)

10. Name three factors that accelerate rusting.(3 marks)

11. Describe an experiment to investigate conditions necessary for rusting.(10 marks)

12. Distinguish between galvanizing and electroplating.(4 marks)

13. Describe any 5 methods of preventing rusting.(10 marks)

14. Explain why a piece of magnesium in contact with a steel pipeline prevents the pipeline from rusting.(4 marks)

15. Name 2 metals that can be used to electroplate items and give reasons for electroplating.(4 marks)

01/03/2024

FORM 2 PHYSICS: ELECTROSTATICS

1. Define the term electrostatics.(1 mark)

2. Describe the electrostatic charging by rubbing.(4 marks)

3. Describe how a pen is made to pick small pieces of paper.(4 marks)

4. Explain the 2 types of static charges.(4 marks)

5. State the law of charges.(2 marks)

6. Apart from rubbing, describe the other 2 methods of charging.(5 marks)

7. Explain how would you confirm that a body is charged.(4 marks)

8. Define earthing.(1 mark)

9. Differentiate between electric field and electric field patterns.(2 marks)

10. Outline the properties of electric lines of force.(4 marks)

11. Describe the factors affecting the magnitude of the force between two charged bodies.(4 marks)

12. a. What is an electroscope?(1 mark)

b. State the 2 types of the electroscope. (2 marks)

13. With an aid of a well labeled diagram, describe how a gold leaf electroscope works.(9 marks)

14. State the uses of a leaf electroscope.(3 marks)

15. Describe any 4 applications of electrostatics.(8 marks)

16. State the effects of electrostatics.(2 marks)

17. Describe how a lightning arrestor is used to prevent the effect of lightning in tall buildings.(9 marks)

18. Define static electricity.(1 mark)

01/03/2024

FORM 3 BIOLOGY:
Vertebrates and invertebrates

1.Define Locomotion (1 mark)

2.State any 3 importance of Locomotion (3 marks)

3. Draw the fish and label any five parts (6 marks)

4.explain How the fish's movement is brought about?(4 marks)

5. Name the fins which controls the following;
a.Braking
b.yawing
c.pitching
(3 marks)

6. Name three types of feathers found in birds (3 marks)

7. Explain the flapping flight of Birds (6 marks)

8.Explain how a swim bladder is used to change the level of fish in water (5 marks)

9. Describe any five adaptations of fish for Locomotion (10 marks)

10. Describe any adaptations of Birds for flight (10 marks)

11. What is the advantage of overlapping of scales in fish and hollow bones in birds in locomotion?(4 marks)

12. Describe how muscles and bones bring about movement.(8 marks)

13. State any 2 problems faced by birds during flying and how each problem is overcomed? (4 marks)

14. State the structures used for swimming in fish.(4 marks)

15. Outline the functions of feathers.(3 marks)

16. Differentiate between vertebrates and invertebrates animals.(4 marks)

17. State any 5 examples of vertebrates and 4 examples of invertebrates animals.(9 marks)

01/03/2024

FORM 3 PHYSICS: CURRENT ELECTRICITY (PART 1)

1. Define :
A. Electric current.(1 mark)
B. Coulomb.(1 mark)

2. State the SI unit of electric Current.(1 mark)

3. Calculate the electric charge delivered if a current of 20A flows for 10 seconds.(3 marks)

4. An electric charge of 50C flows past a point in a wire in 5 seconds. Calculate the current flowing in the wire.(3 marks)

5. Define the term Potential difference.(1 mark)

6. What is the SI unit of potential difference?(1 mark)

7. Explain the difference between Potential difference and Electromotive force.(4 marks)

8. Define the term Electrical resistance.(1 mark)

9. State the instruments used to measure the following:
A. Current.(1 mark)
B. Voltage.(1 mark)
C. Electrical Resistance.(1 mark)

10. The potential difference across a nichrome wire is 10V. If current flowing through the wire is 2A, calculate the electrical resistance of a nichrome wire.(3 marks)

11. Describe 4 factors affecting the electrical resistance of a wire.(8 marks)

12. Describe an experiment to investigate the effect of length of a wire on it's resistance.(10 marks)

13. Explain why the conductivity of different metals is different?(3 marks)

14. State the Ohm's law.(2 marks)

15. A resistor has a resistance of about 200 ohms. Calculate the potential difference required to produce a current of 2A. (4 marks)

16. Calculate the voltage across a 10♎(Ohms) resistor carrying a current of 0.5A. (4 marks)

01/03/2024

FORM 3 CHEMISTRY: IDENTIFICATION OF UNKNOWN ORGANIC COMPOUNDS

1. Give the tests that can be used to distinguish between;
A. Alkanones and alkanals.(6 marks)
B. Alkanoic acids and alkanols.(6 marks)

2. Define the following:
A. Hydrocarbons.(1 mark)
B. Oxycarbons.(1 mark)

3. Describe an experiment used to test for the presence of alkanoic acids.(10 marks)

4. State one chemical property of:
A. Alkenes.(1 mark)
B. Carboxylic acids.(1 mark)

5. A student was asked to identify the following organic compounds:
A. CH3OH
B. CH3COOH
C. C5H10
D. C7H16

I. Which of these organic compounds are;
a. Water soluble.(3 marks)
b. Water insoluble.(3 marks)

Ii. Construct a flow diagram she could use to identify each of them.(8 marks)

6. Describe the procedure for each of the following tests;
A. Bromine test.(4 marks)
B. Brady's test.(4 marks)
C. Solubility test.(4 marks)

7. Which of these general formulae below belongs to alkenes?
A. CnH2n+2
B. CnH2n+1 OH
C. CnH2n+1 COOH
D. CnH2n

8. Write down the functional groups of the following homologous series:
A. Alkenes.(1 mark)
B. Carboxylic acids.(1 mark)
C. Alkanols.(1 mark)
D. Ketones.(1 mark)

01/03/2024

PHYSICAL GEOGRAPHY: RELIEF FEATURES OF OCEAN BASINS

1. Define an ocean basin. (1 Mark (

2. Name any three features of the ocean floor. (3 marks)

3. What is the difference between a continental shelf and a continental slope? (4 marks)

4. How are mid-ocean ridges and trenches similar, and how do they differ? (6 marks)

5. Why do you think some ocean currents are warm while others are cold? (4 marks)

6. Explain any two beneficial effects of ocean currents on human activities? (4 marks)

7. With specific examples, describe how ocean currents lead to the formation of deserts? (5 marks)

8. What happens when circulation of ocean currents is disturbed? Explain 2 points. (6 marks)

9. Explain any 4 effects of El Niño. (8 marks)

10. Why is the coast of Peru one of the most productive fishing areas in the world? (4 marks)

11. Describe 3 factors that influence the direction of ocean currents. (6 marks)

12. Explain how the following cause ocean currents:
A. Prevailing winds. (3 marks)
B. Temperature. (3 marks)
C. Salinity. (3 marks)

13. State the Ferrell's law. (3 marks)

01/03/2024

FORM 4 CHEMISTRY: ELECTROLYSIS

PART ONE
1. Define the term electrolysis. (1 mark)

2. Explain why solid sodium chloride does not conduct electricity but aqueous or molten sodium chloride does. (5 marks)

3. Explain the difference in conductivity of sodium metal and solid sodium chloride. (4 marks)

4. What is meant by the following terms:
A. Electrolyte. (1 mark)
B. Nonelectrolyte. (1 mark)
C. Anode. (1 mark)
D. Cathode. (1 mark)

5. Describe the factors affecting potential discharge. (6 marks)

6. Explain what is meant by potential discharge. (4 marks)

7. During electrolysis of dilute sulphuric acid, at which electrode does oxidation take place?(2 marks)

8. In the electrolysis of water, at which electrode will hydrogen be produced?. Give a reason for your answer. (4 marks)

9. Describe an experiment to investigate electrolysis of molten lead bromide. (10 marks)

10. Solid sodium chloride does not conduct electricity but in molten or solution form it does. Explain. (4 marks)

01/03/2024

PHYSICAL GEOGRAPHY: LOCAL WINDS

1. What are local winds? (1 mark)

2. State the 3 general characteristics of local winds. (3 marks)

3. What physical mechanism generates a sea-land breeze system? (2 marks)

4. With the aid of well labeled diagrams, explain how land and sea breezes occur. (8 marks)

5. Describe the effects of sea breeze and land breeze. (6 marks)

6. Describe two characteristics of Chinook wind. (4 marks)

7. Describe any 3 effects of the Chinook wind. (6 marks)

8. What is the difference between prevailing and local winds? Give two points. (4 marks)

9. Why are the windward areas of most mountains and Islands greener than the leeward areas? (4 marks)

01/03/2024

Form 3 Biology - Living Things & Their Environment
____________________________________
Describe how energy flow in an ecosystem.
___________________________________

The main source of energy in every ecosystem is sunlight. This light energy is absorbed by chlorophyll in green plants and converted into chemical energy, for this reason plants are called producers. Next energy flow is from plants to first consumers along food chains as plants are eaten by first consumers. In this step, energy moves to first consumers from producers. If the first consumers are eaten by second consumers, the energy flows to second consumers. The sequence continues till the final consumer in the ecosystem.

However, not all energy is transferred from one trophic level to another.This is so because some energy is lost in form of heat during respiration of plants and animals. Some energy is unused when parts of plants and animals are left uneaten.

01/03/2024

Form 3 Biology - Transport in Plants
________________________________________
Essay;
Explain how translocation occurs in plant leaves.(10 marks)
________________________________________
Translocation is the movement of substances e.g glucose & amino acids from where they are manufactured to where they are used or stored (sinks). The process takes place in phloem transport vessels called sieve tube elements. Substances move along adjacent cells by active transport and hydrostatic pressure or cytoplasmic streaming in sieve tubes.
When substance accumulate in the sieve tubes of the phloem of the leaves they draw water from adjacent cells by osmosis into the sieve tubes. This causes an increase in hydrostatic pressure in the sieve tubes resulting to the movement of materials to areas of storage and use. These materials move along the cytoplasmic filaments from one sieve tube cell to the next through the pores on the sieve plate by active transport. The process uses energy produced by mitochondria of companion cells.

01/03/2024

FORM 4 AGRICULTURE: PRICE ELASTICITY OF DEMAND AND SUPPLY

1. Differentiate between demand and Supply (4 marks)

2. Explain the effect of higher prices on demand of the commodities (3 marks)

3. Explain any 3 causes of change in the price of a commodity (6 marks)

4. Define the price elasticity of demand (PED) (2 marks)

5.a.) Determine the price elasticity of demand for beef when the price changes from K100/kg to k110/kg resulting in change in the quantity demanded from 5600kg to 4800kg.(5 marks)

b. Name the degree of the price elasticity of demand shown in question 5a above (1 mark)

6. Describe the 3 degrees of price elasticity of demand (6 marks)

7. Define the price elasticity of supply (2 marks)

8. Calculate the price elasticity of supply for groundnuts at Liwonde Market when the price changes from K90 to k100 per kg, resulting in a change in quantity supplied from 6000kg to 6600kg (5 marks)

9. Explain the following degrees of price elasticity of supply:
A. Elastic supply (2 marks)
B. Inelastic supply (2 marks)
C. Unitary supply (2 marks)

10. Explain any 2 differences between elasticity of demand and elasticity of supply (4 marks)

01/03/2024

FORM 3 PHYSICS: THERMOMETRY

1. Define:
a. Heat (1 mark)
b. Temperature. (1 mark)

2. Discuss:
a. Lower fixed point of a liquid in glass thermometer. (3 marks)
b. Upper fixed point of a liquid in glass thermometer. (3 marks)

3. State Three physical properties that are used by thermometers to measure temperature. (3 marks)

4. With an aid of a well labeled diagram explain how a clinical thermometer works. (8 marks)

5. Convert the following into kelvin:
a. -245°C.(2 marks)
b. 97°C.(2 marks)
c. 105°C.(2 marks)

6. Convert the following into degrees Celsius:
a. 263K.(2 marks)
b. 550K. (2 marks)
c. 300K.(2 marks)

7. Give two differences between a laboratory thermometer and a clinical thermometer. (2 marks)

8. Explain why an alcohol liquid thermometer might be preferred to a mercury liquid thermometer in arctic region. (3 marks)

9. List any 2 advantages and 2 disadvantages of using mercury as thermometer liquid. (4 marks)

10. List two advantages of using alcohol as a thermometer liquid. (2 marks)

11. Water is unsuitable for use in thermometers. State a reason for this. (4 marks)

12. With an aid of a diagram, explain how a thermocouple works. (8 marks)

13. Explain why a liquid in glass thermometer has the following:
a. A thin walled glass bulb. (2 marks)
b. A thick glass wall. (2 marks)
c. A very narrow capillary tube. (2 marks)

14. State any 2 advantages of a resistance thermometer. (2 marks)

15. Explain why scientists prefer to use kelvin scale over Celsius scale. (4 marks)

16. Describe how a liquid in glass thermometer works. (10 marks)

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