Science Core Concepts Flashcards
(Two air-tight cans of equal weight are placed on opposite sides of a weighing scale. Both the cans on the left and on the right contain 2 pages of bond paper. The bond papers on the right can be lighted and burned while keeping the cover air-tight.)
1. After burning, what will happen to the arrow at the middle of the weighing scale if it points to the direction of the heavier side?
a. It will point to the left.
b. It will point to the right.
c. It will remain at the middle.
d. I will know when I get to high school.
e. None of the above.
C
If the cover of the cans is removed before burning the bond papers on the right can, where will the arrow point at?
a. It will point to the left.
b. It will point to the right.
c. It will remain at the middle.
d. I will know when I get to high school.
e. None of the above.
A
A hot air balloon pilot loosens the burner valve when he wants to go up and tightens it when he wants to go down.
What is the relationship of the loosening and tightening of valve to the rate of burning of gas in the burner?
a. Tightening the valve increases rate of burning.
b. Tightening the valve decreases rate of burning.
c. Loosening the valve does not do anything.
d. Loosening the valve decreases rate of burning.
e. None of the above.
B
What is the relationship of the increase or decrease in burning to the temperature of the gas inside the balloon?
a. Increased burning increases gas temperature.
b. Increased burning decreases gas temperature.
c. Decreased burning increases gas temperature.
d. There is no relation.
e. None of the above.
A
When the temperature of the gas increases, its density:
a. Increases
b. Decreases
c. Remains the same
d. Increases then decreases
e. None of the above
B
A fluid of lower density will tend to ______ a fluid of higher density.
a. Sink below
b. Rise above
c. Remain the same
d. Rise and sink
B
During a thunderstorm one can observe a display of lights crossing from the clouds to the ground.
The lightning is first seen before thunder can be heard; how can you explain this phenomenon?
a. Light travels while sound does not.
b. Light travels faster than sound.
c. Light travels slower than sound.
d. Light and sound travel at different time zones.
e. None of the above.
B
During a thunderstorm one can observe a display of lights crossing from the clouds to the ground.
The sound produced when lightning strikes is due to…
a. The force of the lightning hitting the ground.
b. The clouds colliding to each other.
c. The Greek God Zeus running through the clouds.
d. The expansion of air around the path of the lightning.
e. None of the above
D
During a thunderstorm one can observe a display of lights crossing from the clouds to the ground.
Lightning strikes the ground because of…
a. A difference in height.
b. A difference in electrical charge.
c. A difference in mass.
d. A difference in temperature.
e. None of the above.
B
A truck, a car, and a motorbike are moving at the same speed on an express highway.
Which among the following is true?
a. The motorbike is fastest because it is the lightest.
b. The truck is most difficult for the car to overtake.
c. The truck is the fastest because it is the heaviest.
d. It will be easier for the motorcycle to stop
D
A truck, a car, and a motorbike are moving at the same speed on an express highway.
Which among the three will require the largest force to be able to stop?
a. Truck
b. Car
c. Motorcycle
d. All will require the same force
A
(An alarm clock is placed inside a vacuum tube and is allowed to ring.)
Which among the following is true?
a. The clock will not be able to ring
b. The clock will be able to ring but will not be heard
c. The clock will ring but will immediately stop because it is in a vacuum
d. The clock will disintegrate
e. None of the above
B
(An alarm clock is placed inside a vacuum tube and is allowed to ring.)
The ringing cannot be perceived outside the vacuum tube because?
a. The tube walls are blocking the sound
b. The sound travels very slowly
c. Sound needs air to travel
d. Air inside the tube is too dense for sound to travel
e. None of the above
C
(An alarm clock is placed inside a vacuum tube and is allowed to ring.)
Vacuum means:
a. That there is practically no air inside the tube
b. There is a very dense air inside the tube
c. The tube walls are very rigid
d. The tube is in space
A
Since the success of the USA and USSR in putting objects in space, nations around the world have launched numerous artificial satellites to orbit the earth for purposes of communication and weaponry.
They are called artificial satellites because ___.
a. They are made from artificial metal
b. They are made from plastic and alloys
c. They are made by humans and therefore not naturally found in space
d. They fall down after some time
e. None of the above
C
