Magnetism 8

8 Learning Opportunities from Monday the 30th of March until Friday the 1st of May.
Learning Opportunity 8: Assess Your Progress
This Learning opportunity has three tasks to do.
Target Time: 50 minutes.

Task 1: Use a webpage to revise. Give the website a rating.

Read each of these sections below to revise magnetism.
You can try the quiz to revise too.
Give BBC Bitesize a star rating out of 5. How good is BBC Bitesize?

Try everything except page 5:

Write down your rating of BBC Bitesize: ? / 5

Task 2a: Assess your progress. Try Questions Part 1 [Q1 to Q15].

Choose A B C or D for each question.
Make sure you read each question carefully, and choose only the right answer!
The questions get harder as you go through.
Write down your answers.
Check your score at the end of the blog.

1        Which metal object would be attracted to a magnet?
A        aluminium milk bottle top
B        piece of copper wire
C        piece of magnesium ribbon
D        steel key ring

2        Which of these metals would NOT be attracted to a magnet?
A   cobalt
B   iron      
C   nickel 
D   silver

3        Which result in the table is not correct?

 Name of magnetic poleNear to aResult
Anorth polenorth polerepulsion
Bnorth polesouth poleattraction
Csouth polenorth poleattraction
Dsouth polesouth poleattraction

4        Which magnetic substance does not let magnetic forces act through it?
A        sheet of aluminium         
B        sheet of glass
C        sheet of plastic              
D        sheet of steel

5        What can be made into a magnet by stroking it, in the same direction each time, with the pole of a magnet?
A        copper tube             
B        glass rod
C        iron nail                   
D        plastic strip

6        If it is free to move, the north-seeking pole of a magnet will point towards the Earth’s:
A        axis                        
B        equator
C        north pole           
D        south pole

7        What is the space called, around a magnet, where there is a magnetic force?
A        area                  
B        field
C        region               
D        volume

8        An electromagnet is fitted to the end of a crane that is used in a scrap yard.
Which two metals could be separated by using this electromagnet?
A        aluminium from copper
B        aluminium from steel
C        brass from copper
D        iron from steel

9        The diagram shows a bar magnet
At which point, is the magnetic effect strongest? A, B, C, or D?

10       Which one of these does not contain an electromagnet?
A        electric bell           
B        electric clock
C        electric fan           
D        electric iron

11       An electromagnet can be made by connecting a low voltage supply in series with a coil made of:
A        insulated copper
B        insulated plastic
C        uninsulated copper
D        uninsulated plastic

12       The drawing shows a bar magnet held in a clamp. A length of cotton has been used to fasten a steel paper clip to the base of the clamp stand. The paper clip is attracted to the magnet. Thin sheets of different metals are placed in the gap between the magnet and the paper clip. Which one of them will prevent the magnet from attracting the paper clip?
A        aluminium            
B        brass
C        copper                 
D        nickel

13     An electromagnet is stronger when it has a core. What is the core is made of?
A     copper            
B     iron
C     plastic              
D     wood

14     The diagram shows a bar magnet.
The lines are called ‘ magnetic …………… lines’.    The missing word is

A     direction             
B     effect
C     field                 
D    strength

15     What is one advantage of electromagnets compared to permanent magnets?
A     they are always more powerful
B     they can be switched on and off
C     they never become hot
D     they do not have opposite poles

Task 2b: Assess your progress. Try Questions Part 2 [Q16 to Q25].

16     The diagram shows a battery and a switch connected to a coil of insulated wire. There are two plotting compasses, X and Y, one at each end of the coil. 
When the current is switched on, which directions will X and Y point?
A        Both left
B        One up, one down.
C        Diagonally up.
D        Both down.

17     The points around an electromagnet where has the greatest magnetic effect are called its
A     contacts            
B     electrodes
C     poles                 
D     terminals

18     Which one of the following will not increase the strength of an electromagnet?
A     having a copper core
B     having an iron core
C     increasing the current in the coil
D     increasing the number of turns on the coil

19     A bar magnet, the Earth and an electromagnet coil round a pencil have magnetic fields. The shape of the field is similar for:
A     all three of them
B     the bar magnet and the Earth only
C     the bar magnet and the straight coil only
D     the Earth and the straight coil only

20     A plotting compass is placed next to the middle of a small but powerful bar magnet.   Which diagram is correct?

21     The diagram shows a magnetic N-pole, which is fixed and a magnetic S-pole, which is free to move. It also shows four directions, A, B, C and D.

In which direction will the S-pole move?

22     Which row, in the table, shows what will cause the greatest increase in the strength of an electromagnet?

 Number of turns on the coilCurrent through the coil

23     Which row in the table is correct?

 End of a compass needleAttracted to the Earth’s magneticWhich is near the Earth’s geographical
Anorth polenorth polenorth pole
Bnorth polesouth polesouth pole
Csouth polenorth polesouth pole
Dsouth polesouth polenorth pole

24     The diagram shows the magnetic field lines around two bar magnets.

At which point will the magnetic field strength be weakest? 

25     The diagram shows a box. Hidden in the box are two bar magnets.
Four plotting compasses are shown outside the box. 
How are the magnets arranged in the box?

Task 3: Check your answers.

Part 1:
1D, 2D, 3D, 4D, 5C,
6C, 7B, 8B, 9D, 10B or D,
11A, 12D, 13B, 14C, 15B
Part 2:
16A, 17C, 18A, 19A, 20C
21D, 22A, 23C, 24B, 25C

0 – 4 = Beginner. Try the quiz again!
4 – 8 = Good work. Look at your answers and learn five more to improve.
9 – 12 = Very good. Look at your answers and learn three more to improve.
13 – 16 = Excellent. Try a Seneca module on Magnetism!
17 – 20 = Outstanding. Try TWO Seneca modules on Magnetism!
21+ = You are a Professor of Magnetism! Excellent work!