| Homework |
|
Topic: |
| Question 1 |
Give two sources from which salt ca be extracted. |
C3 |
| Question 2 |
Open-label, blind and double blind are types of human trials- which is least open to bias? |
B2 |
| Question 3 |
A simple name for an object emitting radiation is a __________?? |
P2 |
| Question 4 |
The absorption/ reflection of infra-red radiation by gases in the atmosphere when it is given out by the Earth causes the Earth's temperature to (increase/ stay the same/ decrease). |
P2 |
| Question 5 |
Which type of cells remember the antigens of micro organisms, allowing immunity? |
B2 |
| Question 6 |
Two numbers are given for a blood pressure reading- what is happening to the heart for the lower value? |
B2 |
| Question 7 |
1000J of energy is put into a motor and we get 850J of useful movement out of the motor. What is the efficiency of the motor? |
P3 |
| Question 8 |
Which two types of radiation can optical fibres carry? |
P2 |
