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Punjab (PTB) · Quarter book test · Free

1st Year Physics 3rd Quarter Book Paper

40 marks · 1 hour · 28 questions. Covers: CHAP 7: Waves and Vibrations, CHAP 8: Physical Optics and Gravitational Waves, CHAP 9: Electrostatics and Current Electricity.

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1st Year Physics 3rd Quarter Book Paper

1st Year · Physics · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 40Time: 1 hour

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

  1. Malu's law deal with:

    1. Intensity of reflected light

    2. Intensity of polarized light passing through an analyzer

    3. Frequency of light

    4. Wavelength of polarized light

  2. The resistance of an LDR:

    1. Increases with increase in light intensity

    2. Decreases with decrease in light intensity

    3. Remains constant regardless of light

    4. First increases then decreases

  3. 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

  4. Which of the following devices can be used to polarize light?

    1. Prism

    2. Convex lens

    3. Polaroid sheet

    4. Plane mirror

  5. Kirchhoff's first rule is the manifestation of the law of conservation of:

    1. Mass

    2. Charge

    3. Energy

    4. Momentum

  6. 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

  7. Which is the primary method used to detect gravitational waves?

    1. Optical telescopes

    2. Radio telescopes

    3. LASER interferometry

    4. Gravitational lensing

  8. What is the main limitation of thermistor?

    1. They are very large in size

    2. They cannot work in circuit

    3. Their response is non-linear

    4. They are extremely expensive

  9. 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

  10. According to Brewster's law. the reflected and refracted rays are:

    1. Parallel

    2. Perpendicular

    3. At 45o

    4. Colinear

  11. The detection of galvanometer is proportional to:

    1. Voltage

    2. Resistance

    3. Current

    4. Power

  12. 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

Q2. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

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

  2. What is meant by zero electric potential?

  3. What is plane polarized light?

  4. What is coherent light?

  5. What factors affect the resistivity of a meterial?

  6. What are the applications of Brewster's angle?

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

  8. Why is a potentiometer more accurate than a voltmeter?

  9. Write down some applications of plane polarized.

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

  11. How does Gauss's law help us to calculate?

  12. Can Brewster's law be applied to all type of waves?

Q3. Long questions (Attempt any 3 of 4 · 3 × 4 = 12)

  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. We wish to use a glass plate of refractive index of 1.5 in air as a polarizer. Find the polarizing angle and angle of refraction.

  3. State and explain Gauss's law.

  4. 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