Free Printable Brain Teasers Challenge

1.

Imagine you’re in a room that is filling with water. There are no windows or doors. How do you get out?

a)

stop imagining

b)

run out of the door

c)

climb over the window

2.

Give me food, and I will live; give me water, and I will die. What am I?

a)

food

b)

fire

c)

water

3.

What goes up but never goes down?

a)

a lift

b)

your age

c)

a balloon

4.

What is the powerhouse of the cell?

a)

Nucleus

b)

Mitochondria

c)

Ribosome

d)

Endoplasmic Reticulum

5.

Which gas is most abundant in the Earth's atmosphere?

a)

Oxygen

b)

Hydrogen

c)

Nitrogen

d)

Carbon Dioxide

6.

What is the chemical symbol for gold?

a)

Au

b)

Ag

c)

Pb

d)

Fe

7.

What planet is known as the Red Planet?

a)

Earth

b)

Mars

c)

Jupiter

d)

Venus

8.

What is the process by which plants make their food?

a)

Respiration

b)

Photosynthesis

c)

Digestion

d)

Transpiration

9.

What is the hardest natural substance on Earth?

a)

Gold

b)

Iron

c)

Diamond

d)

Quartz

10.

What is the speed of light in a vacuum?

a)

$3 \times 10^8$ m/s

b)

$1.5 \times 10^8$ m/s

c)

$3 \times 10^6$ m/s

d)

$1.5 \times 10^6$ m/s

11.

What is the main gas found in the air we breathe?

a)

Oxygen

b)

Carbon Dioxide

c)

Nitrogen

d)

Hydrogen

12.

What is the boiling point of water at sea level?

a)

100°C

b)

90°C

c)

80°C

d)

70°C

13.

What is the chemical formula for table salt?

a)

$NaCl$

b)

$KCl$

c)

$CaCl_2$

d)

$MgCl_2$

14.

What is the largest organ in the human body?

a)

Heart

b)

Liver

c)

Skin

d)

Lungs

15.

What is the basic unit of life?

a)

Organ

b)

Tissue

c)

Cell

d)

Organism

16.

What is the force that pulls objects toward the Earth?

a)

Magnetism

b)

Friction

c)

Gravity

d)

Electricity

17.

What is the chemical symbol for water?

a)

$H_2O$

b)

$O_2$

c)

$CO_2$

d)

$H_2$

18.

What is the center of an atom called?

a)

Electron

b)

Proton

c)

Neutron

d)

Nucleus

19.

What is the most common element in the universe?

a)

Oxygen

b)

Hydrogen

c)

Carbon

d)

Helium

20.

What is the smallest particle of an element?

a)

Molecule

b)

Atom

c)

Electron

d)

Proton

21.

What is the main source of energy for the Earth?

a)

Wind

b)

Water

c)

Sun

d)

Geothermal

22.

What is the chemical formula for carbon dioxide?

a)

$CO_2$

b)

$CH_4$

c)

$C_2H_6$

d)

$C_6H_{12}O_6$

23.

What is the process of converting liquid into vapor?

a)

Condensation

b)

Evaporation

c)

Sublimation

d)

Precipitation

24.

What is the largest planet in our solar system?

a)

Earth

b)

Mars

c)

Jupiter

d)

Saturn

25.

What is the primary function of red blood cells?

a)

Fight infection

b)

Transport oxygen

c)

Clot blood

d)

Digest food

Brain Teasers Challenge

Total questions: 25

Worksheet time: 25mins

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