A sound wave is produced by a loudspeaker cone, which creates pulses of pressure by moving back and forth between two points X and Y as shown in the diagram.The…

A mixture of C2H4(g) and H2(g) is placed in a sealed container. Some finely divided nickel is added as a catalyst to the mixture. The temperature rises to 150°C and…

What is the minimum number of people shown in the family pedigree who must be heterozygous for the two situations described in the table in the absence of any new…

The new sign for a local business contains two different sections. One of the sections will be produced from wood, while the other will be metal. Metal is three times…

A cyclist and a bike have a combined mass of 100kg. The cyclist free-wheels (rolls without pedalling) at a constant speed of 0.8m/s down a 1 in 10 slope (this…

Tritium, symbol T, is hydrogen with a mass number of 3. It is radioactive and undergoes βdecay.Which of the following could be the only product(s) after a quantity of HTO…

In a monohybrid genetic cross a ratio of phenotypes of 3:0 rather than the usual 3:1 ratio wasseen. This could be due to:1 offspring with both dominant alleles not surviving.2…

In a fairground game there are two bags, each of which contains 4 coloured balls. There are a total of 4 red balls, 3 yellow balls and 1 blue ball.…

The circuit shows three lamps and two ammeters in a circuit. Lamp X 'blows' (the filament breaks).What happens to the reading on each ammeter, and to the total resistance of…

Vanadium is a metal that lies just above zinc in the reactivity series. Which one of the following could not be used to obtain the metal from its ore? Answer:…