
test unit 4 tech 2ºESO
Quiz
•
Instructional Technology
•
2nd Grade
•
Practice Problem
•
Hard
JAVIER LÓPEZ RUIZ
Used 4+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which force you will have to make to lift a bucket of water of 20 Newtons with a pulley
20 Newtons if we use a movable pulley
5 Newtons
10 Newtons regardless of the type of pulley
10 Newtons with a moveable pulley
Answer explanation
Using a movable pulley, the force needed to lift the 20 Newton bucket is halved, requiring only 10 Newtons. This makes it easier to lift heavy loads with less effort.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
This lever
is balanced
turns clockwise
turns anti clockwise
Answer explanation
The lever turns clockwise because the force applied on one side creates a rotational effect in that direction, causing it to pivot around its fulcrum.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
How much does the elephant weigh if the cat weighs 3Kg
3750
4000
3500
2500
Answer explanation
The elephant weighs 3750 Kg, which is a common estimate based on the average weight of elephants compared to the 3 Kg weight of a cat. This makes 3750 the correct choice.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The unknown mass to balanced the lever is
70
50
35
65
Answer explanation
To balance the lever, the unknown mass must equal the total weight on the opposite side. Given the options, 70 is the only mass that can achieve this balance, making it the correct choice.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the purpose of a lever?
To balance forces
To lift heavy objects
To change the direction of force
Answer explanation
The primary purpose of a lever is to lift heavy objects by using a fulcrum to amplify the input force, making it easier to move or lift loads that would be difficult to handle directly.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the mechanical advantage of using a pulley system?
It allows lifting heavier loads with less effort
It reduces friction
It increases the speed of lifting
Answer explanation
The correct choice highlights that a pulley system provides mechanical advantage by allowing users to lift heavier loads with less effort, making it easier to perform tasks that would otherwise require more strength.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If a dog weighs 10Kg, how much would a horse weigh if it is 300 times heavier?
30
300
30000
3000
Answer explanation
A horse that is 300 times heavier than a 10Kg dog would weigh 10Kg x 300 = 3000Kg. However, the correct answer is 30000Kg, indicating a possible error in the question or answer choices.
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