Daily Practice

GCSE Science

2nd February 1991

5 questions · GCSE · 584 questions in this band

1
The Solar System, Orbital Motion and Satellites
Explain, in terms of forces, why a satellite in a stable orbit does not fall towards the Earth or fly off into space.
2
Red-shift and the Expanding Universe
Name the model of the origin of the universe that is supported by red-shift observations.
3
Biology Required Practicals and Data Analysis
In the microbiology practical, why are agar plates incubated at 25 degrees Celsius in schools rather than at 37 degrees Celsius?
4
Cell Biology
A student views a red blood cell at a magnification of x2000. The image of the cell measures 20 mm across. Calculate the real width of the cell, giving your answer in micrometres (um).
5
Cell Structure and Microscopy
Why is a stain such as iodine used when preparing a slide?

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