STEM JHS Whiz Challenge (Easy Round)

An astronaut is studying the stars and notes that the most abundant element in the universe makes up about 75% of its normal matter. This element is also the main fuel in the Sun's nuclear fusion. Which element is it?

• Helium

• Hydrogen

• Oxygen

• Carbon

Which of the following numbers is divisible by 8?

• 88882

• 77754

• 99992

• 66652

Answer explanation

A number is divisible by 8 if its last three digits form a number divisible by 8.

• 88882 → last three digits: 882 ÷ 8 = 110.25 → not divisible

• 77754 → last three digits: 754 ÷ 8 = 94.25 → not divisible

• 99992 → last three digits: 992 ÷ 8 = 124 → divisible ✅

• 66652 → last three digits: 652 ÷ 8 = 81.5 → not divisible

✅ Therefore, the only correct answer is 99992 (orange).

What programming language is used behind mBlock's blocks when converted into text code for Arduino?

• Python

• Java

• Scratch

• C / C ++

Which UN Sustainable Development Goal (SDG) focuses on ensuring access to affordable, reliable, and clean energy for all?

• SDG 7

• SDG 8

• SDG 11

• SDG 13

Answer explanation

Sustainable Development Goal #7 is focused on Affordable and Clean Energy.

What type of mirror is used in a car side mirrors to show a wider view?

• Plane Mirror

• Parabolic Mirror

• Concave Mirror

• Convex Miror

If 3 x 4 = 12 and 12 = 2 x 6, then 3 x 4 = 2 x 6.
This illustrates the _____.

• Transitive Property

• Multiplication Property

• Symmetric Property

• Reflexive Property

What is the name of the Lego-based robotics kit commonly used in schools for STEM learning?

• Lego Duplo

• Lego Technic

• Lego Spike Prime

• Lego Creator

Which UN Sustainable Development Goal (SDG) talks about taking urgent action against climate change?

• SDG 7

• SDG 12

• SDG 13

• SDG 15

Answer explanation

Sustainable Development Goal # 13 talks about Climate Action.

What is the boiling point of water at sea level?

• 50 °C

• 75 °C

• 100 °C

• 150 °C

What will be the remainder when 4,567 is divided by 25?

• 12

• 22

• 20

• 17

Answer explanation

To find the remainder, divide 4,567 ÷ 25.

• 25 × 182 = 4,550

• Subtract: 4,567 − 4,550 = 17

So, the remainder is 17. ✅