Grade 12 IEB Physical Science
(Physics) Electric circuits (Section E)
Summary & notes
Why is grounding necessary in areas prone to static electricity, such as
computer labs or factories? - ANS-Grounding safely dissipates static
charge to the earth, preventing damage to electronic equipment...
Physical Science P1 Questions and Answers Guaranteed Pass
1. Mechanics
Question 1: A car accelerates from rest at a rate of 2 m/s². How far does it travel in 5 seconds?
A) 10 m
B) 25 m
C) 50 m
D) 100 m
Answer: B) 25 m
Question 2: What is the momentum of a 1500 kg car moving at a velocity of 20 m/s? A) 30,000
kg·m/s
B) 15,000 kg·m/s
C) 750 kg·m/s
D) 300 kg·m/s
Answer: A) 30,000 kg·m/s
2. Waves and Sound
Question 3: What is the frequency of a wave with a wavelength of 2 m and a speed of 340 m/s?
A) 170 Hz
B) 340 Hz
C) 680 Hz
D) 85 Hz
Answer: A) 170 Hz
Question 4: When a sound wave travels from air into water, which property changes? A)
Frequency
B) Wavelength
C) Speed
D) All of the above
Answer: D) All of the above
3. Electricity and Magnetism
Question 5: What is the total resistance of three resistors of 4 Ω, 6 Ω, and 10 Ω connected in
series? A) 20 Ω
B) 18 Ω
C) 10 Ω
D) 24 Ω
,Answer: A) 20 Ω
Question 6: If a circuit has a voltage of 12 V and a current of 3 A, what is the resistance? A) 4 Ω
B) 12 Ω
C) 36 Ω
D) 9 Ω
Answer: A) 4 Ω
4. Thermodynamics
Question 7: What is the specific heat capacity of a substance if 500 J of heat is required to raise
the temperature of 2 kg of the substance by 10°C? A) 25 J/kg·°C
B) 50 J/kg·°C
C) 100 J/kg·°C
D) 10 J/kg·°C
Answer: B) 25 J/kg·°C
Question 8: Which of the following processes involves the transfer of heat without direct
contact? A) Conduction
B) Convection
C) Radiation
D) Evaporation
Answer: C) Radiation
5. Chemical Reactions
Question 9: What type of reaction occurs when magnesium reacts with hydrochloric acid to
produce magnesium chloride and hydrogen gas? A) Synthesis
B) Decomposition
C) Single replacement
D) Double replacement
Answer: C) Single replacement
Question 10: In a balanced chemical equation, what must be true about the number of atoms of
each element? A) They must be equal on both sides of the equation
B) They can be unequal
C) They must be double on the reactants' side
D) They must be zero
Answer: A) They must be equal on both sides of the equation
6. Acids and Bases
, Question 11: What is the pH of a solution with a hydrogen ion concentration of 1 × 10⁻⁷ mol/L?
A) 7
B) 0
C) 14
D) 1
Answer: A) 7
Question 12: Which of the following is a strong acid? A) Acetic acid
B) Citric acid
C) Hydrochloric acid
D) Carbonic acid
Answer: C) Hydrochloric acid
7. Atomic Structure
Question 13: Which particle in an atom has a positive charge? A) Electron
B) Proton
C) Neutron
D) Photon
Answer: B) Proton
Question 14: What is the atomic number of an element? A) The number of neutrons
B) The number of protons
C) The total number of protons and neutrons
D) The total number of electrons
Answer: B) The number of protons
8. Periodic Table
Question 15: Which of the following elements is a noble gas? A) Oxygen
B) Nitrogen
C) Helium
D) Hydrogen
Answer: C) Helium
Question 16: What is the most reactive group of elements on the periodic table? A) Noble gases
B) Halogens
C) Alkali metals
D) Transition metals
Answer: C) Alkali metals
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