One and two mark questions
One to two mark questions will start with command words such as 鈥楧别蝉肠谤颈产别...鈥 or 鈥楨虫辫濒补颈苍...鈥. Some command words are easy to understand such as:
- 鈥楥alculate...鈥 or 鈥楧etermine...鈥 for maths questions
- 鈥楥omplete...鈥 to fill in a gap in a table or graph
- 鈥楧efine...鈥 to give the meaning of an important word
- 鈥楽uggest...鈥 where you use your knowledge in an unfamiliar situation
The command words 鈥楧别蝉肠谤颈产别...鈥 and 鈥楨虫辫濒补颈苍...鈥 can be confusing. If you are asked to describe a graph, you will be expected to write about its overall shape, whether it is linear or curved, the slope of gradients etc. If you are asked to explain why a pattern or trend is seen in a graph, you will be expected to use your science knowledge, not just say what you see (which is a description), eg The graph shows a steep linear increase for the first three hours because...
Explain how and why questions often have the word 鈥榖ecause鈥 in their answer. Describe questions don鈥檛.
The number of marks per question part is given in this form [2 marks]. It is essential that you give two different answers if a question is worth two marks. Sometimes you can gain a second mark by giving the units in a calculation or stating specific data points, eg the speed of the object decreased by 8 m/s.
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Understanding the different command words in your science GCSE exams.
Sample Question 1 - Foundation
Question
A teacher demonstrates the penetration of alpha, beta and gamma radiation through different materials. The demonstration is shown in Figure 1.
Figure 1
Complete Figure 1 by writing the name of the correct radiation in each box.
Alpha
Beta
Gamma
Gamma radiation is the most penetrating and is reduced by thick lead. Beta radiation is fairly penetrating and may be stopped by a few millimetres of aluminium. Alpha radiation is the least penetrating and may be stopped by paper, skin or a few centimetres of air.
Sample Question 2 - Foundation
Question
Give two safety precautions that should be taken when handling radioactive sources. [2 marks]
- (radioactive) source outside the box for minimum time necessary
- (radioactive) source held with tongs/forceps
- (radioactive) source held away from body
- (radioactive) source not pointed at others
Sample Question 3 - Higher
Question
A teacher wears polythene gloves as a safety precaution when handling radioactive materials.
The polythene gloves do not stop the teacher鈥檚 hands from being irradiated.
Explain why the teacher wears polythene gloves. [2 marks]
Wearing gloves prevents transfer of any radioactive material being transferred to the teacher鈥檚 hands. If they did get radioactive material on their skin, it could cause damage over a longer period.
Some safety precautions such as gloves, goggles, masks and overalls are designed to stop harmful materials getting into the body through the skin, eyes, nose or mouth.
Sample Question 4 - Higher
Question
In a nuclear reactor a chain reaction occurs, which causes neutrons to be released.
The control rods absorb neutrons.
The control rods can be moved up and down.
Explain how the energy released by the chain reaction is affected by moving the control rods. [2 marks]
Lowering the control rods into the reactor increases the number of neutrons that are absorbed. This slows the rate of reaction and decreases the amount of energy released.
An answer describing the opposite effect would also gain credit, eg raising the control rods out of the reactor decreases the number of neutrons that are absorbed. This increases the rate of reaction and the amount of energy released increases.