Science Revision Questions – hard

Common Entrance Revision: Includes more advanced questions
15 questions suitable for CE or scholarship
KS3 Levels 5 and 6
Answer all 15 questions and then press ‘Submit’
Your score and any corrections will then be shown

1. What formula is used to calculate pressure
2. Something has kinetic energy when....
3. What is the test for oxygen gas?
4. a = 5cm    b=3cm   c=3cm

The mass of the block = 90g

blockWhat is the volume of the block?
5. What is a 'pixel'?
6. Complete the word equation:
Hydrochloric acid + sodium hydroxide →     ?
7. Where is the male gamete (pollen) formed in plants?
8. The amount of matter in a substance is its
9. About 20cm of magnesium ribbon is chopped up into 1cm lengths and placed in a crucible which is then weighed along with its lid.
The crucible is heated strongly and the lid gently raised avery few seconds.

When the reaction is over the crucible + contents + lid are all re-weighed

These are his results:
  • Mass of empty crucible + lid  = 51.2g
  • Mass of crucible + lid + magnesium (before heating) = 54.3g
  • Mass of crucible + lid + contents (after heating) = 54.7g
 

What mass of oxygen did the magnesium react with? 
10. Enzymes are needed by our body to help us do what?