General Science Quiz - Chemistry, Biology & Physics

Isaac Newton formulated the Law of Universal Gravitation in 1687, published in his Principia Mathematica. J.J. Thompson discovered the electron, Christian Barnard was a heart surgeon, and Michael Faraday worked on electromagnetism.

Gregor Mendel discovered the fundamental laws of heredity through his pea plant experiments (1856-1863), establishing the principles of segregation and independent assortment. Davy worked in chemistry, Hans Christian Oersted in electromagnetism, and Newton in physics.

Ernest Rutherford supervised the famous gold foil experiment in 1909, which was actually conducted by Hans Geiger and Ernest Marsden under his guidance. The experiment led to the discovery of the atomic nucleus. J.J. Thomson discovered the electron, James Chadwick discovered the neutron, and Lew Kowarski was a nuclear physicist not associated with this experiment.

The gold foil experiment's main outcome was discovering that atoms have a small, dense, positively charged nucleus at their center, with most of the atom being empty space. This revolutionized atomic theory. Neutrons, protons, and electrons were either discovered later or through different experiments - the nucleus itself was the key discovery here.

Chemical properties of elements are primarily determined by valence electrons - the electrons in the outermost shell. These electrons participate in bonding and chemical reactions. Inner electrons and the nucleus don't directly participate in chemical bonding. Protons determine nuclear charge and atomic number, not chemical behavior.

James Chadwick discovered the neutron in 1932, confirming its existence as a neutral particle in the nucleus. Rutherford had predicted the neutron's existence earlier but didn't discover it. Niels Bohr developed the Bohr model of the atom, and J.J. Thomson discovered the electron, not the neutron.

Isotopes are atoms of the same element that have identical atomic numbers (same number of protons) but different mass numbers (different numbers of neutrons). Isobars have different atomic numbers but same mass number. Isotones have same number of neutrons but different protons. Nuclear isomers are excited states of nuclei.

Dmitri Mendeleev created the first successful periodic table in 1869, arranging elements by atomic weight and leaving gaps for undiscovered elements. His predictions about missing elements proved correct. Lavoisier categorized elements but didn't create a periodic table. Newlands proposed the Law of Octaves. Kekulé is famous for work on organic chemistry structure, not periodic tables.

Aluminium is a trivalent impurity (3 valence electrons) while silicon is tetravalent (4 valence electrons). When aluminium atoms are added to silicon, they create electron deficiencies called 'holes' in the crystal structure, making it a p-type semiconductor where holes are the majority charge carriers. Aluminium acts as an acceptor impurity.

Bromine is the only non-metal that exists as a liquid at room temperature (25°C). It is a halogen in Group 17 with atomic number 35, appearing as a reddish-brown volatile liquid that readily evaporates to form a similarly colored gas. Mercury is a metal, while astatine and iodine are solids at room temperature.

ATP (Adenosine Triphosphate) is the primary energy currency of the cell. It consists of an adenine base, a ribose sugar, and three phosphate groups. When energy is needed, the terminal phosphate bond is broken to release energy, forming ADP (Adenosine Diphosphate). The other options are made-up terms.

Oxygenic photosynthesis uses water, carbon dioxide, and light energy to produce glucose and oxygen. The oxygen released comes from the splitting of water molecules during the light-dependent reactions, not from carbon dioxide. This process occurs in plants, algae, and cyanobacteria. Water is consumed, not produced; chlorophyll is a pigment that absorbs light, not a byproduct.

This is correct. The three primary factors determining blood alcohol content are: 1) body size/weight (larger bodies have more blood volume to dilute alcohol), 2) total amount of alcohol consumed, and 3) rate of drinking (faster drinking leads to higher peak BAC).

When sound travels to the cliff and reflects back as an echo, measuring the round-trip time allows distance calculation. Using the formula distance = (speed of sound × time) / 2, you can determine how far the cliff is.

The -CO- group (carbonyl group with carbon double-bonded to oxygen, flanked by two carbon atoms) is called a ketone. In organic chemistry, ketones are characterized by this R-CO-R' structure where carbon is bonded to two alkyl groups. Acids contain -COOH, esters have -COO-, and ethers have R-O-R structures, so the ketone identification is correct.

The -COOH functional group is called carboxylic acid, commonly shortened to 'acid'. This group consists of a carbonyl (C=O) and hydroxyl (-OH) bonded to the same carbon. Option A shows 'ASID' which is a typo for 'ACID', but it's clearly meant to be the correct answer. Esters contain -COO-, amides contain -CONH2, and amino groups contain -NH2.

The -NH2 functional group is called an amino group or amine. Amines are organic compounds derived from ammonia by replacing one or more hydrogen atoms with organic groups. Chloro (A) refers to -Cl, amide (C) is -CONH2, and acid (D) refers to -COOH.

The -CONH2 functional group is called an amide. Amides are derived from carboxylic acids where the -OH group is replaced by -NH2. Fluoro (A) refers to -F, oxime (B) is =NOH, and nitro (D) is -NO2. The amide group is crucial in proteins (peptide bonds).

The -O- functional group (oxygen atom bridging two carbon atoms) is called an ether. Ethers have the general structure R-O-R'. Nitro (A) is -NO2, amino (B) is -NH2, and aldehyde (C) is -CHO (with a typo in the option). Common examples include diethyl ether used as an anesthetic.