Year 7 Science Semester Two
- 1.The most abundant gas in the Earth's atmosphere making up roughly 79% of the total volume of gas is...
- A.
Oxygen
- B.
Nitrogen
- C.
Argon
- D.
Krypton
- 2.
Air pressure is defined as the amount of "push" of air particles on a set area of space. It is important that we can adequately measure air pressure to ascertain appropriate information about our environment and what is happening around us.Air pressure is measured using a device called a...- A.
Thermometer
- B.
Pressurometer
- C.
Barometer
- 3.
A sudden drop in barometric pressure indicates that...
- A.
Warm weather is on its way, categorized by calm winds
- B.
It is cold and wet
- C.
Very unsettled weather is approaching. Categorized by strong winds and rain.
- D.
It is cold and wet but warm calm weather is approaching.
- 4.
Magnetism is a force of nature. Check all the boxes that correspond to the force of Magnetism
- A.
Only pulls objects towards each other.
- B.
Only acts on certain materials
- C.
Only acts over a small distance
- D.
Strength depends on many things including size and shape.
- 5.
Gravity is a force that hold planets in orbit. It is also the reason that our atmosphere and ourselves do not float off into space. Gravity can be defined as...Check all boxes that correspond to the correct answers
- A.
A force that attracts and repels
- B.
Has a stronger force on smaller objects
- C.
Acts on all objects
- D.
Can act over very large distances (many millions of kilometers)
- 6.
Everything is made of the smallest of building blocks called atoms. The molecule C6H12O6 is...
- A.
6 carbon atoms and 12 water molecules
- B.
6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms
- C.
6 chlorine atoms, 12 helium atoms and 6 oxygen atoms
- D.
Is starch
- 7.
The chemical equation below represents what reaction?
- A.
Photosynthesis
- B.
Cellular respiration
- C.
Combustion
- D.
Fermentation
- 8.
When Carbon Dioxide (CO2) is bubbled through a liquid, the liquid turns a milky white colour. This is due to the precipitation of "chalk" residue, due to the reaction with the carbon dioxide. This test is know more commonly as the ...
- A.
Taper test
- B.
Reaction Test
- C.
Pressure test
- D.
Limewater test
- 9.
During some types of reactions, oxygen gas (O2) can sometimes be created. To understand if the gas produced is in fact oxygen, scientists need to perform tests to check if they are correct. The test used to check for the presence of oxygen gas is...
- A.
Taper test
- B.
Reaction test
- C.
Pressure test
- D.
Limewater test
- 10.
A can is heated on a stove until the small amount of water inside it has started to evaporate. At this point, the can is inverted and placed in a tub of cold water. It is observed that the can quickly implodes and ends up being crushed. This is due to...
- A.
The high pressure in the can drawing in water
- B.
The high pressure of the atmosphere crushing the weakened can
- C.
The low pressure inside the can exerting too much force.
- D.
None of the above
- 11.
As a man is barbecuing outside in the rain. As the rain gets heavier he decides to bring his propane gas cylinder next to the barbecue. As he dashes inside to grab some tongs he hears an almighty bang outside. As he looks out the window he can see a large fireball erupt into the air. Explain what has happened.
- A.
The rain on the metal cylinder has rusted part of the cylinder. This means it is weaker and therefore cannot hold sufficient pressure anymore.
- B.
As the man drew the cylinder next to the barbecue it has increased in temperature. This has caused the space between the gas in the cylinder to expand leading to an explosion.
- C.
As the gas is being used by the barbecue it is leading to a low pressure environment inside the cylinder leading to an implosion.
- 12.
In reference to the diagram below...
- A.
A = condensation, b = solidification, c = sublimation
- B.
A = sublimation, b = condensation, c = melting
- C.
A = sublimation, b = evaporation, c = freezing
- D.
A = sublimation, b = condensation, c = solidification
- 13.
Sulphuric Acid is added to the left hand beaker (1) of sugar. A change occurs in which the sugar starts to bubble and a sweet smell can be detected (2). The white sugar now changes to a dark black "carbon" colour (3). An explanation to this is...
- A.
It is a physical change because the sugar has dissolved into the sulphuric acid
- B.
It is a physical change because the sugar has changed into carbon.
- C.
It is a chemical change because the sugar has been dissolved into the sulphuric acid.
- D.
It is a chemical change because the sugar has changed into carbon.
- 14.
After studying this graph of air pressure and height above sea level (altitude) it can be concluded that...
- A.
As the height of the graph increases, it increases at the same time as the altitude. Therefore as height increases, pressure increases.
- B.
As the height of the graph increases the pressure of the graph decreases. It can therefore as height increases, pressure decreases.
- C.
As the height of the graph decreases, the pressure also decreases.
- D.
None of the above answers are close to being correct.
- 15.
A student is conducting an experiment in a science lab. He wants to find out whether different gases heat up at different rates. To achieve this, he has two conical flasks: - one with carbon dioxide and - one with pure air. He heats both of the flask up with the same heat source.The independent variable of this experiment is...
- A.
The apparatus
- B.
The gases
- C.
The time
- D.
The heat
- 16.
The kinetic theory states that all matter is made up of small particles that move.Select the answer below that is incorrect, in reference to the above picture.
- A.
Solids move more than liquids because their particles are closer together.
- B.
As a solid melts it must be gaining energy as it's particles move further apart.
- C.
The particles in a gas have so much energy that the bond between adjacent particles are broken.
- D.
As a liquid cools, it loses energy so the particles come closer together and move less.
- 17.
An implosion occurs when the air pressure outside an object is significantly greater than the air pressure inside the object.
- A.
True
- B.
False
- 18.
A gun works by a small pin hitting the base of a bullet. By doing this it makes the gun powder quickly change from a solid into a gas. How does this enable the gun to shoot a bullet at high speed?
- A.
As the solid turns into a gas, the gas takes up more room than the solid creating an area of low pressure. The bullet is therefore "sucked" out of the gun and the atmospheric air is trying to get inside the gun.
- B.
As the solid turns into a gas, the gas takes up more room than the solid creating an area of low pressure. The bullet is therefore forced out of the gun as the gas wants to get from an area of high to low pressure.
- C.
The hammer hits the bullet with such force that the bullet is propelled out of the gun
- D.
None of these answers are correct.
- 19.
A weather balloon is used to help forecast the weather. It is generally made up of a semi-deflated balloon attached to a transmitting device.Choose the statements that are correct (THERE MAY BE MORE THAN ONE)
- A.
The balloon starts out semi-deflated so it wont rise too quickly.
- B.
If the weather balloon started out fully inflated it would pop before achieving a great height.
- C.
A weather balloon starts out semi deflated because as it climbs in the air there is less pressure so the balloon will expand.
- D.
The balloon starts out semi-deflated so it will rise quickly.
- 20.
By definition a vacuum is an area of space that is completely lacking in any particles of any kind - there is nothing there (like outer space).Select all the other statements that are true about vacuums (there may be more than one)
- A.
The pressure in a vacuum is zero (or very close to zero).
- B.
Sound can be heard for a long distance in a vacuum as there is no resistance.
- C.
Air will rush into a vacuum as it is an area of very low pressure.
- D.
A vacuum can be made in a lab with the aid of a vacuum pump.
- 21.
This is a program that a student has made using Robolab. The student successfully downloads it to the RCX.When the "run" button is pressed what will the student see happen.
- A.
Nothing. There is a flaw in the programming
- B.
The RCX will go forward at speed 3 for 2 seconds, then turn right sharply for 2 seconds before stopping
- C.
The RCX will go forward at speed 3 for 2 seconds, then turn right sharply for 2 seconds and will repeat this twice.
- D.
The RCX will go forward at speed 3 for 2 seconds, then turn right sharply for 2 seconds but will not stop as there is an ABC stop missing.
- 22.In robotics, an RCX is...
- A.
A small black "Sending tower" connected by USB
- B.
A yellow programmable robot
- C.
The program used for creating robotic functions
- 23.The PIGIBAAC system in science is used as a way of exploring ideas and solving problems
- A.
True
- B.
False
- 24.
The symbols in robotics
- A.
Create a right hand then a left hand turn to aid in making a square
- B.
Create a left hand then a right hand turn to aid in making a square
- C.
Make a square.
- D.
Is a repeat function used to repeat often used functions.
- 25.
A student wishing to make this right hand spin should
- A.
Set Motor A forward, power level 5. Motor C backwards, power level 5.
- B.
Set Motor A forward, power level 5. Motor C backwards, power level 3.
- C.
Set Motor C forward, power level 5. Motor A backwards, power level 5.
- D.
Set Motor C forward, power level 5. Motor A backwards, power level 3.
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