Waves
Which wave can travel through a vacuum?
A) Sound
B) Water
C) Electromagnetic
D) Seismic
C) Electromagnetic
What is a small section of DNA that codes for a protein?
A) Chromosome
B) Gene
C) Allele
D) Nucleotide
B) Gene
What is the number of protons in an atom called?
A) Mass number
B) Atomic number
C) Isotope number
D) Valency
B) Atomic number
Which type of bonding involves a transfer of electrons?
A) Covalent
B) Metallic
C) Ionic
D) Hydrogen
C) Ionic
Which ion is present in all acids?
A) OH⁻
B) H⁺
C) Cl⁻
D) Na⁺
B) H⁺
The distance between two peaks of a wave is called:
A) Amplitude
B) Wavelength
C) Frequency
D) Speed
B) Wavelength
What is the shape of a DNA molecule?
A) Single helix
B) Double helix
C) Spiral coil
D) Ladder
B) Double helix
Atoms of the same element with different numbers of neutrons are called:
A) Ions
B) Isotopes
C) Molecules
D) Elements
B) Isotopes
What type of bonding is found in water molecules?
A) Covalent
B) Ionic
C) Metallic
D) Hydrogen
A) Covalent
Which ion is present in all alkalis?
A) OH⁻
B) H⁺
C) Cl⁻
D) Na⁺
A) OH⁻
Which wave property determines the energy of a wave?
A) Speed
B) Wavelength
C) Frequency
D) Reflection
C) Frequency
What is the process of making an identical copy of DNA called?
A) Transcription
B) Translation
C) Replication
D) Mutation
C) Replication
Who first arranged elements by atomic number?
A) John Dalton
B) Dmitri Mendeleev
C) Ernest Rutherford
D) Marie Curie
B) Dmitri Mendeleev
Which carbon allotrope is the softest and conducts electricity?
A) Diamond
B) Graphite
C) Graphene
D) Fullerenes
C) Graphene
What is the universal indicator colour for neutral solutions?
A) Red
B) Blue
C) Green
D) Purple
C) Green
What happens when a wave bounces back from a surface?
A) Refraction
B) Diffraction
C) Reflection
D) Absorption
C) Reflection
A change in the DNA sequence is called:
A) Gene
B) Chromosome
C) Mutation
D) Allele
C) Mutation
Which subatomic particle has a negative charge and orbits the nucleus?
A) Proton
B) Neutron
C) Electron
D) Positron
C) Electron
Which structure has a giant covalent lattice?
A) Sodium chloride
B) Diamond
C) Water
D) Ammonia
B) Diamond
What is the reaction called when an acid reacts with an alkali to form salt and water?
A) Oxidation
B) Neutralisation
C) Combustion
D) Precipitation
B) Neutralisation
When light slows down entering a denser material, what happens to the wave?
A) It reflects completely
B) It diffracts
C) It refracts
D) It is absorbed
C) It refracts
Two heterozygous parents (Aa) have children. What is the probability a child is homozygous recessive?
A) 0%
B) 25%
C) 50%
D) 75%
B) 25%
Which group in the periodic table contains the most reactive metals?
A) Group 1
B) Group 2
C) Group 7
D) Group 0
A) Group 1
Why does graphite conduct electricity?
A) Each carbon forms four bonds
B) Delocalised electrons move freely between layers
C) It contains ions
D) Its layers are very strong
B) Delocalised electrons move freely between layers
What is produced when a metal oxide reacts with a non-metal oxide?
A) Salt
B) Water
C) Hydrogen
D) Carbon dioxide
A) Salt