Revision 6
20 Chemistry CBT Test Questions
Properties of Matter
1. Which of the following is NOT a physical property of matter?
A) Density
B) Boiling point
C) Reactivity
D) Melting point
2. The ability of a substance to be hammered into thin sheets is known as:
A) Malleability
B) Ductility
C) Elasticity
D) Hardness
3. Which state of matter has a definite volume but no definite shape?
A) Solid
B) Liquid
C) Gas
D) Plasma
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Gas Laws
4. Boyle’s law states that at constant temperature, the pressure of a gas is:
A) Directly proportional to volume
B) Inversely proportional to volume
C) Directly proportional to temperature
D) Inversely proportional to temperature
5. According to Charles’ Law, if the temperature of a gas increases at constant pressure, its volume:
A) Decreases
B) Increases
C) Remains constant
D) Becomes zero
6. The mathematical equation for the ideal gas law is:
A)
B)
C)
D)
7. The SI unit for measuring pressure in gas laws is:
A) Newton
B) Pascal
C) Joule
D) Kelvin
8. The term "isotherm" in gas laws refers to:
A) A process where pressure remains constant
B) A process where temperature remains constant
C) A process where volume remains constant
D) A process where the number of moles remains constant
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Atomic Structure and Theories
9. Who proposed the "Plum Pudding Model" of the atom?
A) John Dalton
B) J.J. Thomson
C) Ernest Rutherford
D) Niels Bohr
10. Which atomic model introduced the concept of energy levels?
A) Dalton’s Model
B) Rutherford’s Model
C) Bohr’s Model
D) Quantum Mechanical Model
11. Rutherford’s gold foil experiment led to the discovery of:
A) Electrons
B) Nucleus
C) Neutrons
D) Energy levels
12. According to Bohr’s atomic theory, electrons move in:
A) Fixed circular orbits around the nucleus
B) Random paths around the nucleus
C) Probability clouds
D) Spiral paths leading to the nucleus
13. The quantum mechanical model describes electrons as:
A) Small solid spheres
B) Negative clouds of probability
C) Positively charged particles
D) Particles with fixed positions
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Periodic Table and Atomic Properties
14. Elements in the same group of the periodic table have the same:
A) Atomic number
B) Number of neutrons
C) Number of valence electrons
D) Atomic mass
15. The atomic number of an element represents:
A) The number of protons in the nucleus
B) The number of neutrons in the nucleus
C) The number of protons and neutrons combined
D) The number of valence electrons
16. Isotopes of an element have:
A) The same number of protons but different numbers of neutrons
B) The same number of neutrons but different numbers of protons
C) The same number of protons and neutrons
D) Different atomic numbers
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Chemical Reactions and Bonds
17. Which of the following is a characteristic of an exothermic reaction?
A) Absorbs heat from the surroundings
B) Releases heat to the surroundings
C) Increases in temperature
D) Does not involve energy transfer
18. The bond formed between two non-metal atoms by sharing electrons is called:
A) Ionic bond
B) Metallic bond
C) Covalent bond
D) Hydrogen bond
19. The process by which an atom gains or loses electrons to form an ion is called:
A) Covalent bonding
B) Ionization
C) Polarization
D) Crystallization
20. Which of the following factors affects the rate of a chemical reaction?
A) Tem
perature
B) Concentration of reactants
C) Presence of a catalyst
D) All of the above