[WASSCE BECE NOVDEC NABPTEX 0547316472]

1ai)Draw and label a diagram of a vacuum flask

1aii)Describe how heat gain and heat loss are minimised due to the construction of the vacuum flask

bi)What is kinetic Energy ?

ii)An athlete of mass 70.00kg runs a 300m race in 10s.

iii)Calculate the kinetic energy possessed by the athlete

Ci)State the functions of each of the following parts of the human mammalian circulatory system

i)Heart ii)Artery

2i)Name three pollutants of water

ii)Give two effects of water pollution

iii) Explain the principle in which the thermostat functions

iv)Give two examples of devices that use a thermostat

v)list four methods of applying chemical fertilisers

vi)Explain why aluminium does not corrode easily

3i)Name three items in the home made of aluminium.In each case,state the property of aluminium which makes it portable for the item you have name.

ii)Explain how hydration aids in the weathering of rocks ?

iii)State the energy transformation involved in hydroelectric power generation

iv)Explain why the hydroelectric power dam has thicker walls at the base than at the top.

v) A force acts on a body of a mass 15g and causes the body to move with acceleration of 40.0ms-2.Calculate the force acting on the body.

4i) What is classification of living things?

ii)State three reasons why it is necessary to classify living things

iii)List seven major groups into which Taxonomists classify living things in order of hierarchy.

iv)With the aid of a diagram,explain why light bends when it moves from air to water

v)state the conditions under which sodium reacts with water and write the balanced equation for the reaction.

5i)Define poultry

ii)Name three major farm animals and state one product of each

iii)Explain two mechanisms by which the body of a mammal cools down when it is overheated.

iv)Name the two classes of welfare foods.

v)State two organisms involved in the nitrogen cycle

vi)State three ways in which the nitrogen cycle is important to living organism.

6i)Define the following

-Fruit or seed dispersal

-fruit

ii)State two characteristics each of fruits or seeds dispersed by

a)Wind

b)Water

c)Animal

iii)What is thermal expansion?

iv)State two effects of thermal expansion

v)what is petrochemical?

vi)State the ohms law

7i)State one use of the following fractions of petroleum

i)Bitumen

ii)Diesel

iii)Petroleum gas

ii)Two resistors of resistance 10ohms are connected in parallel to a battery of e.m.f 12V.Calculate the current flowing through the 20ohms resistor

iii)What is malnutrition and state three effects of malnutrition.

iv)State three dangers associated with over exposure to X-rays

v)What are X-rays ?

8i)What is meant by the following terms

a)Atomic number

b)Mass Number

ii)Tabulate three difference between covalent compounds and ionic compounds

iii)Differentiate between thinning and pricking out as used in crop production.

iv)State two benefits of pricking out.

v)What are Organic fertilisers

vi)State three advantages of organic fertilisers over inorganic fertilisers

9i)What is magnetic field ?

ii)Two bar magnets of similar strength and size are placed in a straight line with opposite poles facing each other .Draw and label a diagram to show a magnetic flux pattern around them.

iii)Define work

iv)A mango of mass 1.5kg is hanging 10m above the ground.If the mango has velocity of 5m/s,Calculate the

a)Potential energy of the hanging mango

b)kinetic energy of the falling mango

v)state three conditions that causes self-pollution and cross-pollution each.

10i)What is a base?

ii)State three(3) chemical properties of a base

iii)What is an acid-base indicator?

iv)What are specialised cells?

v) State three reasons why the spent cell is a specialised cell.

vi)Give four advantages of a leaf for photosynthesis.

vi)Define flower

vii)Define photosynthesis