I AM DEAD

Question 1

A woman has been smoking heavily for many years. her arteries is blocked with tar. is this true or false

Answer 1

false

Question 2

10g of potassium chloride is added into a beaker containging 25 ml of water. what happens

Answer 2

enodthermic process

Question 3

kwashiorkor

Answer 3

protein defiency

Question 4

a vehicle sinks into soft ground
the vehicle is changed so that it does not sink as far. which change is made?

Answer 4

wider tyres

Question 5

dispersion

Answer 5

splitting of light

Question 6

refraction

Answer 6

bending of light

Question 7

condensation
evaporation
melting
sublimation

which is the change of state is an exothermic process

Answer 7

condensatiion

Question 8

a rocket is travelling vertically upwards/ air resistance equals:

Answer 8

you use the thrust minus the weight

Question 9

direction of motion
mass
shape speed

whcih list contains only properties of an object that can be changed by a force

Answer 9

direction of motion
shape
speed

Question 10

state the effect on the moment of girl’s weight when she moves closer to the pivot

Answer 10

decrease

Question 11

explain why steam is used to reacct with magnesium

Answer 11

so that the reaction can go more rapidly

Question 12

in terms of energy that is given out and energy that is put in, what is an exothermic reaction

Answer 12

an exothermic reacction is a reacction that gives out energy that is put in, what is an exothermic reaction

Question 13

what kind of prodcut is made in the reaction between potassium and water> how would you test for it

Answer 13

alkali. us ph indicator such as litmus paper, universal solvent

Question 14

describe the pulling force and frictional foce

Answer 14

which force is large than another

Question 15

after a short time, the suitcase is moving at a constant speed. 2 reasons

Answer 15

size of pulling force equals to the size of frictional force
opposite direction

Question 16

state what would hhappen to the object when very cold water is ppoured over it

Answer 16

shirnkd

Question 17

descrbe the movement of particles when very cold water is poured over it

Answer 17

move slower

Question 18

describe the chnage in gas pressure inside the object and explain your answer

Answer 18

gas pressure decreases as the particles of gas collide with the wall lesss fequentl

Question 19

describe the atmospheric pressusre outside the objectt

Answer 19

does not change

Question 20

how does atmospheric outside the object chagnes the object

Answer 20

it compresses it

Question 21

which colouds of light slows the most when passing through the glass prism

Answer 21

violet

Question 22

howcould you move the screen to make the colours on the screen dimmer

Answer 22

move the screen further away from the prism

Question 23

what is a magnetic material

Answer 23

an object or anything that is attracted to a mgnet

Question 24

what does magnetise mean

Answer 24

given the properties of a magnet

Question 25

suggest a method to magnetise the iron by using a bar magnet

Answer 25

stroke the iron with the same pole of the magnet in the same direction for several times

Question 26

describe how the strength of the magnetic field varies when detected along the direction north to south

Answer 26

gets weaker then get stronger

Question 27

why when the wire is connected to the cell, the pointed end of the nail can be used to pick up paperclips

Answer 27

when current flow through the nail, it is magnetised paperclips are magnetic

Question 28

how can dylan identifu the poles of electromagnet

Answer 28

place the noerh pole of a bar magnet close to the pointed end of the pole, if it repels ,north, attracts south

Question 29

why small paperclips would giv e better result as compared to large paperclips

Answer 29

a better range of values can be measured

Question 30

two advantages of using an adjustable power supply compared to changing number of cells in the circuit

Answer 30

cells might get lowe or run out
easier to adjst the current as compared to connecting or disconnecting the cellls

Question 31

why is it important that only the plastic coating of the wire make contact with the nail

Answer 31

that current does not flow through the nail and make it a conductor

Question 32

what would happen to the poles of this electromagnet if the cell in the circuit were reversed so current flowed in the opposite direction. explain your explain

Answer 32

the poles will be reversed as reversing the cell will reverse the current, the magnetic field will be reversed when current flow in oppoiste direction

Question 33

explain the movement of oxygen from the alveoli to the body cells

Answer 33

• the oxygen in the alveoli diffuse across the walls of the alveoli into the rbc in the blood capillaries
• then, oxygen combines with haemoglobin to form oxyhaemoglobin
• when the oxygen reaches the body cells, oxtgeb us released and diffuse into body cells

Question 34

define the term electrostatic attraction

Answer 34

the electrostatic attraction between the positive and negative charge on the proton and the negative charge on the electron is what holds individuals atoms together

Question 35

why a person needs to eat a balanced diet

Answer 35

essential for healthy growth and development of the body

Question 36

why the food web could not exist without the producers

Answer 36

the prodcues jse energy from the sun to make food by photosynthesis, energy available for all the oother organisms in the foood web

Question 37

what is ddt and what is used to

Answer 37

ddt is a pesticide use to kill mosquitoes that transmit malaria, and fleas that transmit typhus

Question 38

list all the elements found in the potassium nitrate

Answer 38

potassium, nitrogen, oxygen

Question 39

the stength of the magnetic field can be shown by the __________ if the field lines

Answer 39

closeness

Question 40

besides iron and steel, nname another two materials which would be attracted to the magnet

Answer 40

cabalt and nickel

Question 41

what causes a wire to produce a magnetic field

Answer 41

electric current flowing throughout

Question 42

whcih kind of magnet has the same magnetic field as the long coil of wire

Answer 42

bar magnet

Question 43

what is the proper name for a long coil of wire

Answer 43

solenoid

Question 44

a bar of magnet is allowed to rotate freely. explain why the north pole of the bar magnet will point towards geographic north

Answer 44

the pole of the earth’s magnetic field close to geo north is a south pole

Question 45

state the relationship between the direction of the magnetic field lines and the direction that a magnetic compass will point

Answer 45

point along direction of the lines needle points toward geographic north

Question 46

two changes that would speed up the spreading of the purple colour

Answer 46

increase temperature
use smaller volume of water

Question 47

describe the anticlockwise moment as the heavier boy moves slowly along the see-saw until he reaches point p

Answer 47

anitclockwise moment becomes larger than the clockwise moment when the heavier boy reacges point P

Question 48

what causes refraction of light

Answer 48

when light changes speed

Question 49

what can be ovserved if white light is used to replace red light

Answer 49

spectrum of colours produced

Question 50

why a red shirt appears red in whit elight

Answer 50

red is reflected by the shirt and all the other colours of light are abosrbed

Question 51

about 15 minutes, the water had moved up the paper but the drop of liquid had not. why

Answer 51

the liquid is insoluble in water

Question 52

function of ceramic wool

Answer 52

to soak with water so it prodcues steam when it is heated

Question 53

why is method not suitable if there is pottasium

Answer 53

highly exothermic, and highly raeactive