1st Year Physics Chapter 9 Test09. Waves

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. In Doppler's effect formula, vs represents:
   1. Speed of listener
   2. Speed of sound
   3. Speed of source
   4. Speed of medium
2. High frequency sound waves bounce off blood and are used in:
   1. MRI
   2. Echocardiography
   3. X-ray
   4. ECG
3. Formula of intensity in terms of power is:
   1. I = PA
   2. I = P/A
   3. I = A/P
   4. I = Pt/A
4. Which type of light is reduced to half after passing through one Polaroid?
   1. Laser light
   2. UV light
   3. Infrared light
   4. Unpolarized light
5. Which law gives intensity of transmitted polarized light?
   1. Snell's law
   2. Malus's law
   3. Newton's law
   4. Bernoulli's law
6. According to Malus's law, I = I₀ cos²θ. Here θ is angle between:
   1. Direction of propagation
   2. Polarization axis of analyzer and polarizer
   3. Lens and source
   4. Wave and medium
7. A loop in a stationary wave represents:
   1. A node
   2. A crest
   3. An antinode
   4. A trough
8. Resultant wave C in beats is formed by:
   1. Subtraction only
   2. Addition only
   3. Both addition & subtraction of amplitudes
   4. Reflection
9. Stationary waves have:
   1. Travelling nodes
   2. Fixed nodes and antinodes
   3. Only crests
   4. Only troughs
10. Intensity of a wave is defined as:
    1. Energy carried per unit time
    2. Amplitude per unit time
    3. Power carried per unit length
    4. Energy carried per unit area in unit time