Science Quiz

When drinking water containing high concentration of ....................... continuously, this leads to blindness.

• lead

• arsenic

• mercury

• chlorine

Increasing of atomic number in the same group cause .............................

• decrease in atomic size

• decrease in electronegativity

• increase in metallic property

• decrease in nonmetallic property

Sodium oxide is from ......................................... oxides.

• amphoteric

• acidic

• alkaline

• nonmetal

The first vertebrates that appeared are .......................................

• birds

• reptiles

• fish

• mammals

The elements of group (7A) are called ...................................

• alkali metals

• halogens

• inert gases

In the periodic table, the elements which are identical in properties lie in the same ..........

• period

• group

• energy level

The hottest atmospheric layer is ..................................

• troposphere

• stratosphere

• thermosphere

From the endangered species is ....................................

• barbary sheep

• the passenger pigeon

• dinosaur

............................................... is from microfossils.

• Corals

• Foraminifera

• Ferns

• Nummulites

All the following are greenhouse gases, except ........................................

• CO2

• O2

• СН4

• H2O