The diagram shows a simple piece of apparatus that can be used to demonstrate some of the events involved in human ventilation. Which events occurring during ventilation will be demonstrated…
The first four triangular numbers are:The difference between the first and second triangular numbers is 2.The difference between the second and third triangular numbers is 3.The difference between the third…
A champion weightlifter raises a 200 kg set of weights from the floor to above his head in one movement. The bar is lifted through a vertical distance of 1.8…
The masses of atoms and molecules can be determined using a mass spectrometer. The masses can be shown as a series of peaks. Element X exists as a diatomic molecule.…
The diagram shows three different types of animal cell. 1 epithelial cell2 mature red blood cell3 muscle cellWhich of these cells is/are found as part of a tissue? Answer: 13)…
All four corners of a rectangle are on the circumference of a circle.The rectangle has a perimeter of 24 cm.The ratio of length : width for the rectangle is 3…
Quantities associated with a moving vehicle include its velocity, speed, momentum and kinetic energy. Which of these quantities will always change if the vehicle changes direction? Answer: 11) E Speed…
Iron is extracted from iron ore (which contains Fe2O3) using carbon monoxide. This overall reaction is slow and so must be heated. The chemical equation for this reaction under certain…
A sample of healthy human cells contains 4 cells. After they were allowed to divide 5 times using the same type of cell division, there were 128 cells in the…
My wallet contains two 50p coins and five 20p coins only. I need 70p to buy an item. If I pick two coins at random from my wallet, what is…