Dubai Stem Olympiad 2019-20 Round 2 | Junior Category

1. Luke's Mom works in a busy office. She sends an email with a file added to it. The file is:

An attachment

A signature

A reply

A text

2. Mary builds and programs a walking robot. However, this robot is unable to balance well and falls over easily. There is likely to be an issue with its:

Temperature Sensor

Gyro Sensor

Colour Sensor

Sound Sensor

3. Jack throws a ball into the swimming pool. He sees that it floats. What is the reason for it to float?

Because of the presence of air in the ball.

Because of the size of the ball.

Because of the movement of the ball.

Because of the shape of the ball.

4. How many lines of symmetry does a square have?

4

1

2

3

5. If a technician tells you that you have a faulty router in your apartment, you are likely to have difficulty accessing which of the following?

The internet

Water from a faucet

The fridge

Your television

6. Martha is 8 years old. John is 5 years older than Martha and 3 years older than Bob. How old is Bob in months?

120

110

10

25

7. If a wooden box is in a state of rest, this means that forces on it are:

Balanced

Unbalanced

Weak

Strong

8. What is 3/4 added to 12/48

1

0

15/48

36/48

9. Sam wants to ensure that the length of a wall is between 90 and 120. The length should also be an even number that is a multiple of 11. The sum of the digits of this length should be 2. What should be the length of Sam's wall?

110

120

116

None of the above

10. Which is not a type of simple machine?

Spring

Pulley

Lever

Wedge

11. A flowchart shows which of the following?

Algorithm

Robots

Water Flow

None of the above

12. A barcode scanner at the supermarket is a type of:

Simple Machine

Autonomous Device

Input Device

Output Device

13. X is the sum of all interior angles in an equilateral triangle. Y is the number of lines of symmetry for an equilateral triangle. What is the value of X+Y? *Diagram not drawn to scale

183

182

93

91

14. Which is true about the amount of work that must be done to lift a bucket using the pulley shown compared to lifting the same bucket without a pulley?

Less work is done when lifting with the pulley.

Less work is done when lifting without the pulley.

The same amount of work is done lifting with or without the pulley.

None of the above

15. X is the number of parallel lines in the following parallelogram. Y is the number of perpendicular lines in this shape. What is the value of X multiplied by Y.

0

1

2

3

16. Henry uses a dog leash of length X meters. Gavin has a dog leash that is 5 times longer. Sophia wants a leash that is of equal length as Henry's and Gavin's combined. What is the length of Sophia's leash?

5X

X

10X

6X

To find the length of Sophia's leash, we need to add the lengths of Henry's and Gavin's leashes. Since we know Gavin's leash is 5 times longer than Henry's, we can write this as:

Henry's leash: X meters

Gavin's leash: 5X meters

Sophia's leash = Henry's leash + Gavin's leash

Sophia's leash = X + 5X

Now, we can simplify the equation:

Sophia's leash = 6X

So, Sophia's leash is 6 times the length of Henry's leash. If you have a specific length for Henry's leash (in meters), you can substitute it into the equation to find the exact length of Sophia's leash.

Explanation

To find the length of Sophia's leash, we need to add the lengths of Henry's and Gavin's leashes. Since we know Gavin's leash is 5 times longer than Henry's, we can write this as:

Henry's leash: X meters

Gavin's leash: 5X meters

Sophia's leash = Henry's leash + Gavin's leash

Sophia's leash = X + 5X

Now, we can simplify the equation:

Sophia's leash = 6X

So, Sophia's leash is 6 times the length of Henry's leash. If you have a specific length for Henry's leash (in meters), you can substitute it into the equation to find the exact length of Sophia's leash.

17. A machine has a load, fulcrum and force. What type of machine is it?

Simple Machine

Complex Machine

Compound Machine

Advanced Machine

18. Kenny has enough paint to cover X square cm. What is the smallest value that X should be if he only wants to paint the two smallest faces of this shape.