Living Organisms
This characteristic of living organisms is responsible for the removal of waste.
Excretion
Identify the type of this salty chemical reaction:
HCl + NaOH → NaCl + H2O
Neutralisation Reaction
A student accidentally drops his phone from a balcony. For the first part of its motion, the only force acting on the phone is gravity. Air resistance is so small it can be ignored, and the phone’s speed increases every second. What physics concept best describes this motion?
Free Fall
Engineers communicate with a space probe far beyond Earth’s orbit. The waves used have the longest wavelengths in the electromagnetic spectrum, can travel vast distances with little loss, and are commonly used for broadcasting and satellite communication. Which type of electromagnetic wave is being described?
Radio Waves
A seesaw is this class of lever.
First Class Lever
This characteristic of living organisms is behind phototropism or the bending and growing of plants towards the sun as a result of being stimulated by light.
Sensitivity
Name this type of reaction that occurs during microbial respiration--the metabolic process where microorganisms (bacteria, fungi) break down organic matter to generate energy.
Decomposition reaction
A student walks to the masjid at a steady pace, stops to tie his shoes, then continues walking faster than before. A graph shows how far he is from home at different times during the journey, including flat sections and straight sloping lines. What type of graph is being described?
Distance-Time Graph
A rescue team searching for hikers at night uses special cameras that can detect heat given off by people, even in complete darkness.
The waves detected have longer wavelengths than visible red light and are emitted by warm objects rather than reflected light. Which type of electromagnetic wave is being described?
Infrared waves
Engineers are installing a heavy telescope onto the roof of a science observatory. The telescope must be lifted straight upward to a high platform. The team wants to reduce the force needed, even if it means pulling a longer length of rope. The system must also allow the telescope to be held safely in place while adjustments are made. Which type of simple machine would best solve this problem?
A Pulley System
In the process of photosynthesis glucose is produced in the chloroplasts of plant cells. What aspect of living organisms does glucose serve?
Nutrition
Don't get burned handling the product of this type of reaction: H2 + Cl2 → 2HCl
Synthesis Reaction
A football is kicked across the smooth floor of a hallway. It slows down and eventually stops, even though no one touches it again. Which force is causing the ball to slow down?
Friction
A masjid installs a new lighting system powered by a 12 V supply. When the lights are switched on, the current in the circuit is 0.5 A. What is the total resistance of the circuit.
24Ω
Any device where the load is deposited in the middle such as a wheelbarrow is this type of lever
Second Class Lever
This diatomic molecule is released by plants as a byproduct of photosynthesis. The release of this molecule is also why trees are often called the lungs of the earth.
Oxygen
This separation technique is used to purify liquids of any sedimentation such as sand, clay, or silt.
Filtration
A skydiver jumps from a plane over the desert. At first, she speeds up quickly, but after a short time her speed stops increasing, even though gravity is still pulling her downward. The upward force from the air balances her weight. What term describes the constant maximum speed she reaches?
Terminal Velocity
At an airport, security scanners use electromagnetic waves that can pass through soft materials like clothing, but are absorbed more by dense materials such as metal.
These waves have short wavelengths, high energy, and can be harmful to living cells if exposure is not controlled. Which type of electromagnetic wave is used here?
X-Rays
A large generator needs to be moved from ground level into a workshop that is 1.5 m higher than the surrounding ground. Instead of lifting it vertically, the engineers decide to spread the work over a longer distance so that less force is required to move the generator upward smoothly. Which type of simple machine should be used?
In this part of the plant cell division or mitosis occurs and is known as the source of all new growth.
Meristem
In this type of chemical reaction a more reactive element pushes out a less reactive element from its compound. The rusting of iron is a common example of this type of reaction.
Displacement reaction
A bus pulls away from a stop, speeds up, travels at a constant speed, then slows down to stop at a red light. A graph shows how the bus’s speed changes every second, including sloping and flat sections.
Velocity-Time Graph
A ray passes from air into the water at a 35 degree angle and bends toward the normal. What happens to the light in this scenario? Why does it bend toward the normal?
The light is being refracted. It bends toward the normal because it slows down in water, which is more dense.
A shovel, where the force is in the middle, is an example of this type of lever.
Third Class Lever