Each collision of Uranium-238 with neutrons releases

  • energy
  • radiations
  • light
  • waves

Carbon is represented by

  • C
  • Na
  • K
  • Mg

One molecule of water is made up of

  • one oxygen and one hydrogen atom
  • one oxygen and two hydrogen atoms
  • two oxygen and one hydrogen atom
  • two oxygen and two hydrogen atoms

Electrons fill energy level starting from the

  • lowest level
  • highest level
  • central level
  • upper level

The number of neutrons in carbon-14 is

  • 7
  • 8
  • 9
  • 14

The first electromagnetic generator "Faraday disk" was built in

  • 1381
  • 1831
  • 1813
  • 1183

If no loss or gain of electrons occur by mixing of two atoms, we say that they may be attached to each other due to

  • proton attraction
  • neutron attraction
  • sharing of electrons
  • opposite charges

Uranium-238 which is an isotope of uranium, is

  • stable
  • radioactive
  • complete
  • decayed

The larger the number of subatomic particles, the more the likeliness of being

  • stable
  • radioactive
  • complete
  • decayed

Isotopes behave the same way in

  • chemical reaction
  • bonding
  • electrical conductivity
  • physical reaction

In methane gas, each carbon atom is bonded with

  • two oxygen atoms
  • two hydrogen atoms
  • three oxygen atoms
  • four hydrogen atoms

Oxygen is a diatomic gas so its chemical formula is

  • O2
  • O2
  • O
  • Ox

The atomic number of helium is

  • 1
  • 2
  • 3
  • 4

The atomic number of hydrogen is

  • 1
  • 2
  • 3
  • 4

Neutrons have

  • negative charge
  • positive charge
  • no charge
  • both charges

Strong radioisotopes can be used to destroy

  • organs
  • bacteria
  • viruses
  • cancer cells

The ionic chemical formula of aluminum is

  • Al-2
  • Al+2
  • Al-3
  • Al+3

When shell K is completed, next electron moves to

  • shell M
  • shell S
  • shell P
  • shell L

The atomic number of carbon is 6, hence there are

  • 2 protons and 4 electrons
  • 6 protons and 12 electrons
  • 6 protons and 12 neutrons
  • 12 protons and 6 electrons

The negative ion is known as

  • cation
  • anion
  • positron
  • negatron

Steam is used to turn

  • dynamos
  • generators
  • turbines
  • transformers

The symbol of lithium is

  • H
  • He
  • Li
  • Na

If you combine atoms of sodium and chlorine, they will form

  • chlorine sodium
  • sodium chloride
  • sodium ion
  • chloride ion

Atom means

  • divisible
  • multiplied
  • added
  • indivisible

The atomic number of sodium is 11 and its atomic mass is 23 and the number of protons and neutrons in an atom of sodium is

  • 11 and 11
  • 11 and 23
  • 23 and 11
  • 11 and 12

Most of the covalent compounds are found in

  • solid state
  • gaseous state
  • liquid state
  • both in liquid and gaseous state

The radioactive isotope of carbon is

  • carbon-12
  • carbon-13
  • carbon-14
  • carbon-6

The ionic chemical formula of potassium is

  • K-
  • K+
  • K-
  • K+

Nuclear batteries are

  • small in size
  • very heavy
  • harmful
  • enlarge in size

To date, scientists have made about 26 millions

  • elements
  • compounds
  • alkalis
  • alkanes
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