ESAT ESAT Physics 2 — Questions and Answers
Question 1: What does the area under a velocity-time graph represent?
- Displacement (Correct answer)
- Acceleration
- Force
- Power
Correct answer: Displacement
The area under a v-t graph gives displacement, since displacement = velocity × time.
Question 2: Which law states that the total momentum of a closed system remains constant?
- Conservation of momentum (Correct answer)
- Newton's third law
- Conservation of energy
- Hooke's law
Correct answer: Conservation of momentum
The law of conservation of momentum states that total momentum is constant in the absence of external forces.
Question 3: What is the gravitational potential energy of a 5 kg mass at a height of 10 m? (g = 10 m/s²)
- 500 J (Correct answer)
- 50 J
- 5000 J
- 250 J
Correct answer: 500 J
GPE = mgh = 5 × 10 × 10 = 500 J.
Question 4: In ESAT Physics, what does Coulomb's law describe?
- The force between two point charges (Correct answer)
- The force on a current-carrying wire
- The electric field inside a conductor
- The energy stored in a capacitor
Correct answer: The force between two point charges
Coulomb's law gives the electrostatic force F = kq₁q₂/r² between two point charges.
Question 5: What is the relationship between pressure, force, and area?
- P = F/A (Correct answer)
- P = FA
- P = A/F
- F = P²A
Correct answer: P = F/A
Pressure is defined as force per unit area: P = F/A.
Question 6: In a series circuit with resistors R₁ = 3Ω and R₂ = 6Ω, what is the total resistance?
- 9 Ω (Correct answer)
- 2 Ω
- 18 Ω
- 4.5 Ω
Correct answer: 9 Ω
Resistors in series add directly: R_total = R₁ + R₂ = 3 + 6 = 9 Ω.
ESAT ESAT Physics 2
What does the area under a velocity-time graph represent?