Dubai Stem Olympiad 2019-20 Round 2 | Senior Category

1. What type of energy cannot travel across space?

Sound energy

Light energy

Radio energy

Heat energy

2. When you are driving around a curve, the force of friction on your tires pushes you in toward the center of the curve (hopefully). A force which pushes an object on curved path toward the center is called a(n)

Gravitational force.

Mechanical force

Centripetal force

Excessive force

3. Which 3 dimensional shape has 5 vertices?

Triangular prism

Square pyramid

Triangular pyramid

Cube

4. Machines that perceives its environment and takes actions that maximize its chance of successfully achieving its goals

Database Management System

Management Information System

Artificial Intelligence

Expert Systems

5. A boy weighing 500 N sitting 3 m from the pivot point requires someone weighing 250 N to be sitting ____ on the opposite side.

0.5 m

5 m

50 cm

6 m

6. When an algorithm is written in the form of a programming language, it becomes a _________

Flowchart

Program

Pseudo code

Syntax

7. A mobius strip is formed when a rectangle is twisted and then the ends are stuck together. If an ant starts on a point on the mobius strip's surface and travels the length of the mobius strip twice, where will it end up relative to its original position?

On the same point it started but on the underside of the surface

At a finite distance from the point it started

At the same point it started

More information is needed

8. The musical instrument below is a music triangle, the side lengths of which are 10cm. The triangle only has two angles, one at the top, and one at the bottom, as the other vertex has been removed to form a gap. One of the angles (the angle at the bottom left) is 57 degrees. Find the other angle angle formed at the top.

35 degrees

57 degrees

83 degrees

74 degrees

9. John works for an advertising company that is trying to make 20,000 brochures. Which of the following would be most appropriate to print all 20,000 of them?

Laser Printer

Inkjet Printer

3D Printer

Dot Matrix Printer

10. Which of the following technologies would be the most appropriate for a flexible screen on a wearable?

OLED

LED

LCD

CCFL

11. The clock is at 12:00, what will the time be on the clock when the angle between the hands is the LCM of 15 and 2?

12:10

12:20

12:30

12:05

12. Which of the following would be most appropriate to create a Machine Learning model?

Python

PHP

HTML

All of the above

13. The hexagonal prism below has a end-faces as regular hexagons, a = 2 and h = 5. Find the volume of the hexagonal prism.

30√3

30√4

6√3

20√4

14. Increasing the size of a driver pulley and reducing the size of the driven pulley would do what to the speed of the mechanism?

Increase the speed of the mechanism

Decrease the speed of the mechanism

Increase the speed of the mechanism at first then gradually slow down

It would have no effect on the speed of the mechanism

15. Mark is typing an essay that is due in 2 hours. Each time he presses a key on the keyboard of his laptop, an electrical signal is sent. This electrical signal is first stored in a/an _____________ before it is sent to the processor to be processed. Fill in the blank.

Buffer

Chip

Interrupt

GPU

16. If two massive objects in space are at distance x, and the gravitaional force between them is y, what is the gravitational force between them when the distance is doubled?

2y

4y

Y/2

Y/4

17. 6 bottles are chosen at random from a large batch of bottles, 10% of which are faulty. Find the probability that of the 6 chosen, none are faulty

0.469

0.0984

0.531

0.246

18. A librarian wants to create a list of all the books in the library. If he has a list, but wants it to be in alphabetical order, which of the following would be the most appropriate to use?

Binary Search Algorithm

Bucket Sort Algorithm

Bubble Sort Algorithm

Linear Search Algorithm

19. Sara bought a 300 AED item and sold it for value x, where x is defined by the equation sin(x) = (√3)/2. What is her percentage loss? (x is in degrees)

80%

90%

60%

70%

20. Jacob has several small congruent square tiles to use in a mosaic. When he forms the tiles into a square of side n, he has 81 tiles left over. When he tries to form the tiles into a square of side n + 1, he has 64 too few. How many tiles does he have in total?

4786

5246

6737

5265

Dubai STEM Olympiad 2019-20 Round 2 | Senior Category