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Punjab (PTB) · Chapter test · Free

1st Year Physics Chapter 7 TestWaves and Vibrations

30 marks · 40 minutes · 21 questions. Covers: CHAP 7: Waves and Vibrations.

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1st Year Physics Chapter 7 Test

1st Year · Physics · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

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

  1. In the superposition of waves, interference is said to be constructive when the waves:

    1. Are of different types

    2. Are exactly out of phase

    3. Arrive at a point with crest meeting crest

    4. Travel in opposite directions

  2. When sound waves diffract around an object, what is observed?

    1. The sound bends and can be heard even behind the object

    2. The sound is completely blocked

    3. The sound gets louder

    4. The frequency of the sound increases

  3. The result of constructive interference between two waves is represented as:

    1. A decrease in amplitude

    2. An increase in amplitude

    3. No change in amplitude

    4. A shift in phase

  4. For same mass per unit length of a string, if tension of a vibrating string is increased by 4 times, then frequency will become:

    1. 2 times

    2. 4 times

    3. 6 times

    4. 8 times

  5. The waves commonly demonstrated in ripple tank are:

    1. Longitudinal sound waves

    2. Transverse water waves

    3. Electromagnetic waves

    4. Seismic waves

  6. The SI unit of wave intensity is:

    1. Watt

    2. Newton

    3. Watt per metre squared

    4. Joule

  7. The waves that can exhibit diffraction are:

    1. Sound waves only

    2. Light waves only

    3. Water waves only

    4. All types of waves

  8. Waves produced in organ pipes are:

    1. Transverse stationary waves

    2. Longitudinal stationary waves

    3. Electromagnetic waves

    4. Matter waves

  9. The point of maximum displacement on stationary wave is:

    1. Antinade

    2. Node

    3. Trough

    4. Crest

  10. If the gap in the ripple tank is made narrow, the diffraction becomes:

    1. Less noticeable

    2. More noticeable

    3. Unchanged

    4. Completely blocked

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. What are the factors which speed of sound in air depends?

  2. What is coherent light?

  3. Is it possible for two identical waves travelling in the same direction along a strin to give rise to a stationary wave?

  4. What is the difference between loudness and intensity of a wave?

  5. What happenes to diffraction pattern if the slit width is decreased?

  6. Which measurement of a wave is the most important when determining the wave's intensity?

  7. Give an example of stationary waves in real life.

  8. What is meant by diffraction of waves? For what purpose, the ripple tank is used?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Average intensity of sunlight on the surface of the Earth is nearly 500 W m-². Determine the amount of energy that falls on a solar panel having an area of 0.5 m2 in four hours.

  2. A steel wire hangs vertically from a fixed point, supporting a weight of 80 N at its lower end, The diameter of the wire is 0.50 mm and its length from the fixed point to the weight is 1.5 m. Calculate the fundamental frequency emitted by the wire when it is plucked. Density of steel wire is 7.8 x 103 kg m-3

  3. What are microwaves? How are stationary waves created by using microwave source?