Robotics (1)

A square has sides of 5 cm. What is its perimeter?

• 10 cm
• 15 cm
• 20 cm
• 25 cm

Answer explanation

Chu vi hình vuông = cạnh × 4 → 5×4 = 20 cm.

What is 45 + 27?

• 62
• 72
• 73
• 71

Answer explanation

45 + 27 = 72.

Which number is the greatest?

• 805
• 850
• 580
• 508

Answer explanation

850 là số lớn nhất.

If today is Tuesday, what day will it be in 3 days?

• Thursday
• Friday
• Saturday
• Sunday

Answer explanation

Thứ Ba + 3 ngày → Thứ Sáu.

A cake is divided into 8 equal parts. Lan eats 3 parts. How much of the cake did she eat?

• ⅓
• ⅜
• ½
• ⅝

Answer explanation

Lan ăn 3/8 chiếc bánh.

Water boils at what temperature?

• 50°C
• 75°C
• 100°C
• 120°C

Answer explanation

Nước sôi ở 100°C.

Which organ helps humans breathe?

• Heart
• Lungs
• Stomach
• Nose

Answer explanation

Phổi giúp con người hít thở không khí.

Plants use which gas for photosynthesis?

• Oxygen
• Nitrogen
• Carbon dioxide
• Hydrogen

Answer explanation

Cây hấp thụ khí CO₂ để quang hợp.

The Moon gets its light from:

• Itself
• The Sun
• The stars
• The Earth

Answer explanation

Mặt Trăng phản chiếu ánh sáng từ Mặt Trời.

What happens when water is placed in a freezer?

• It becomes vapor
• It turns into ice
• It becomes salt
• It disappears

Answer explanation

Nước đóng băng thành đá.