math and science

Which element is the most reactive metals?

• Potassium

• Caesium

• Sodium

• Rubidium

Which halogen named from greek word that means green?

• Fluorine

• Iodine

• Bromine

• Chlorine

Which gas is unreactive and less dense than air?

• Oxygen

• Hydrogen

• Helium

• Argon

An element X has atomic number 15. On The Periodic Table it is located on which period?

• One

• Two

• Three

• Four

Which of the following can be used as catalyst?

• Iron

• Lithium

• Calcium

• Aluminium

Gilbert is paid $10 for every 15 minutes of works. How much will he make if he works for 2 hours?

• $40

• $60

• $80

• $100

Find a number between 50 and 100 which is both a square and cube number.

• 64

• 75

• 81

• 100

A furniture store bought a book shelf at a wholesale price of $200, and the store marks up all furniture by 60%. At what price will the store sell the book shelf?

• $220

• $240

• $280

• $320

How many significant figures are there in 17504200?

• 5

• 6

• 7

• 8

25% of 80 is ...

• 10

• 20

• 40

• 50