ESAT ESAT Physics 1 — Questions and Answers
Question 1: What is Newton's second law of motion as typically tested in the ESAT Physics section?
- F = ma (Correct answer)
- F = mv
- E = mc²
- p = mv²
Correct answer: F = ma
Newton's second law states that the net force equals mass multiplied by acceleration (F = ma).
Question 2: In an ESAT physics problem, a 2 kg object accelerates at 5 m/s². What net force acts on it?
- 10 N (Correct answer)
- 2.5 N
- 7 N
- 3 N
Correct answer: 10 N
F = ma = 2 kg × 5 m/s² = 10 N.
Question 3: Which of the following describes the work-energy theorem?
- Net work done on an object equals its change in kinetic energy (Correct answer)
- Work equals force times time
- Energy is always conserved in all forms
- Power equals force times velocity squared
Correct answer: Net work done on an object equals its change in kinetic energy
The work-energy theorem states W_net = ΔKE = ½mv² - ½mu².
Question 4: What is the SI unit of electric charge?
- Coulomb (C) (Correct answer)
- Ampere (A)
- Volt (V)
- Farad (F)
Correct answer: Coulomb (C)
The SI unit of electric charge is the coulomb (C), equal to one ampere-second.
Question 5: A wave has frequency 500 Hz and wavelength 0.68 m. What is its speed?
- 340 m/s (Correct answer)
- 500 m/s
- 0.68 m/s
- 735 m/s
Correct answer: 340 m/s
v = fλ = 500 × 0.68 = 340 m/s, which is the speed of sound in air.
Question 6: In the ESAT Physics component, Ohm's Law is expressed as:
- V = IR (Correct answer)
- P = IV²
- I = V²/R
- R = IV
Correct answer: V = IR
Ohm's Law states that voltage (V) equals current (I) multiplied by resistance (R).
ESAT ESAT Physics 1
What is Newton's second law of motion as typically tested in the ESAT Physics section?