PHY101 Final Term Past Papers

PHY101

Lecture 18: Physics of Fluids

Q1. What is the definition of density?

• A. Mass per unit volume
• B. Force per unit area
• C. Energy per unit volume
• D. Velocity per unit time

Answer: A

Q2. What is the unit of pressure in the SI system?

• A. Pascal
• B. Newton
• C. Joule
• D. Watt

Answer: A

Q3. Which principle explains the buoyant force experienced by objects in a fluid?

• A. Bernoulli’s Principle
• B. Archimedes’ Principle
• C. Pascal’s Principle
• D. Newton’s Third Law

Answer: B

Q4. What is the formula for calculating the pressure at a certain depth in a fluid?

• A. \(P = \rho gh\)
• B. \(P = \frac{F}{A}\)
• C. \(P = \frac{W}{V}\)
• D. \(P = \frac{mv^2}{r}\)

Answer: A

Q5. What does Bernoulli’s equation relate in a flowing fluid?

• A. Pressure, volume, and density
• B. Pressure, velocity, and height
• C. Density, volume, and mass
• D. Force, area, and acceleration

Answer: B

Lecture 19: Physics of Sound

Q1. What is the speed of sound in air at room temperature?

• A. 150 m/s
• B. 340 m/s
• C. 500 m/s
• D. 1000 m/s

Answer: B

Q2. What is the frequency range of human hearing?

• A. 1 Hz to 100 Hz
• B. 20 Hz to 20,000 Hz
• C. 100 Hz to 10,000 Hz
• D. 1,000 Hz to 100,000 Hz

Answer: B

Q3. What term describes the highest point of a sound wave?

• A. Amplitude
• B. Crest
• C. Wavelength
• D. Frequency

Answer: B

Q4. What is the relationship between frequency and pitch?

• A. Higher frequency means higher pitch
• B. Higher frequency means lower pitch
• C. Frequency does not affect pitch
• D. Pitch is determined by amplitude, not frequency

Answer: A

Q5. What does the Doppler Effect describe?

• A. Change in wave amplitude due to medium
• B. Change in wave speed due to temperature
• C. Change in wave frequency due to relative motion
• D. Change in wave direction due to reflection

Answer: C

Lecture 20: Wave Motion

Q1. What is the period of a wave?

• A. The distance between two consecutive crests
• B. The number of waves passing a point per second

Answer: C

Q2. What is the formula for wave speed?

• A. \( v = f\lambda \)
• B. \( v = \frac{\lambda}{T} \)
• C. \( v = \lambda T \)
• D. \( v = \frac{T}{\lambda} \)

Answer: A