We use expanded polystyrene cups for heat of reaction experiments because the cups are:
3. Question | Chemistry
The only common gas that turns moist red litmus paper blue is:
4. Question | Chemistry
When zinc metal is added to copper sulphate solution the products are copper and zinc sulphate solution, so the material that has been displaced must be:
5. Question | Information Technology
Arrange the following secondary storage devices in order of increasing capacity from smallest to largest: a 1GB memory card, CD-ROM, DVD and a 128 MB flash drive.
6. Question | Chemistry
When gas particles spread out we call it:
7. Question | Information Technology
Which of the following acronyms represents a computer bus primarily designed for the transfer of data between a computer system and a mass storage device?
8. Question | Social Studies
Removal of forests may cause all of the following EXCEPT
9. Question | Chemistry
The voltages from the electrochemical series are -2.92 for potassium and +0.34 for copper, which shows that:
10. Question | Mathematics
Which of the following is a subset of {b, c, d}?
11. Question | Chemistry
In the modern Periodic Table the elements are arranged:
12. Question | Chemistry
When dilute sulphuric acid is electrolysed the two gases produced are hydrogen and:
13. Question | Biology
Which of the following are advantages of asexual reproduction in a flowering plant?
Ⅰ Large numbers of offspring are rapidly produced.
Ⅱ Favourable genotypes are maintained from one generation to the next.
Ⅲ The plant does not need to rely on wind or insects for pollination.
Ⅳ Several identical individuals grow close together.
14. Question | Chemistry
The gas released by baking powder is:
15. Question | Mathematics
The average of a set of numbers reduces from 14 to 11 when the number 35 is removed. How many numbers were in the original set?
16. Question | Physics
A detector close to a sample of radioactive material records 76 counts per second (cps).
Precisely 2 days later the count rate has fallen to 22 cps.The count rate due to background
radiation, taken immediately before and after the experiment, averaged 4 cps. The half-life of the
material is:
17. Question | Information Technology
All of the following devices are commonly used non-impact printers EXCEPT __________.
18. Question | Physics
A loudspeaker emits a steady note.A girl sings a note which is of lower pitch but higher volume.
The sound wave she is producing has:
19. Question | Mathematics
8x - 4(x - 5) =
20. Question | Mathematics
Given that a and b are integers, which of the following is not necessarily an integer?