ENLA Secondary Practice (Peru) · Science and Technology
Science and Technology Reasoning
36 practice questions, each with the answer and an explanation.
Practise Science and Technology Reasoning now
Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.
All 36 questions
- In which part of a plant cell does photosynthesis take place?
- Which are the products of photosynthesis?
- In the food chain grass, grasshopper, frog, snake, the number of frogs falls sharply because of disease. What is the most likely short-term effect?
- In pea plants, tall (T) is dominant over short (t). Two plants with genotype Tt are crossed. What is the probability that an offspring is short?
- What is the main function of red blood cells?
- Which of these organisms is a producer in a lake ecosystem?
- Where in the human body does the chemical digestion of starch begin?
- A population of 20 rabbits doubles every 3 months when food is plentiful. How many rabbits will there be after 9 months?
- In pea plants, tall (T) is dominant over short (t). Two Tt plants are crossed. Among the tall offspring, what is the probability that a plant is Tt?
- Water boils at 100 °C at sea level. Which statement about boiling is correct?
- A solution turns blue litmus paper red. Which pH value is most likely?
- An atom has 6 protons and 8 neutrons. What is its atomic number?
- Which method is best for obtaining solid salt from salt water?
- Hydrogen reacts with oxygen: . How many molecules of water form from 4 molecules of hydrogen and enough oxygen?
- Magnesium burns in oxygen: 24 g of magnesium combine with 16 g of oxygen to form magnesium oxide. How much magnesium oxide forms when 12 g of magnesium burns completely in excess oxygen?
- Iron nails are left outside. What two substances must be present for iron to rust?
- How are the particles arranged in a gas?
- A cyclist rides 90 m in 15 s at a constant speed. What is the speed?
- A resultant force of 10 N acts on a trolley of mass 2 kg. What is its acceleration?
- A 6 V battery is connected in series to two resistors of 8 and 4 . What is the current?
- A 2 kg cart moves at 3 m/s. What is its kinetic energy?
- A metal spoon left in hot soup becomes hot at the handle. Which process mainly transfers the heat along the spoon?
- A solid block has a mass of 240 g and a volume of 30 cm. Water has a density of 1 g/cm. What happens when the block is placed in water?
- A 1500 W electric kettle runs for 20 minutes. At an example price of S/ 0.80 per kWh, what does this use of electricity cost?
- A ray of light hits a flat mirror at an angle of incidence of 30° to the normal. What is the angle of reflection?
- What causes the seasons on Earth?
- Which process changes water vapour in the air into liquid water droplets in clouds?
- Igneous rocks, such as granite, are formed when:
- Why do many earthquakes occur along the western coast of South America, including Peru?
- Which layer of the atmosphere contains the ozone layer that absorbs most of the Sun's harmful ultraviolet radiation?
- A student wants to test whether the amount of light affects the growth of bean seedlings. Which factor should be kept the same in all pots?
- In an experiment, a student dissolves sugar in water at 20 °C, 40 °C and 60 °C and records how much dissolves. What is the independent variable?
- In the same sugar experiment, the mass that dissolves is 90 g at 20 °C, 110 g at 40 °C and 130 g at 60 °C for the same volume of water. Which conclusion fits the data?
- Group A bean plants were given fertiliser and placed in a sunny window; they grew 12 cm on average. Group B had no fertiliser and stood in a shady corner; they grew 8 cm. What can be concluded?
- Which of these is a hypothesis that a student can test in school?
- A runner covers 120 m in 8 s and then 80 m in 12 s. What is the average speed for the whole 200 m?