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Punjab (PTB) · Half book test (board pattern) · Free

1st Year Physics Second half Book Paper

85 marks · 3 hours · 55 questions. Covers: 6 chapters (CHAP 7: Waves and Vibrations to CHAP 12: Nuclear and Particle Physics).

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1st Year Physics Second half Book Paper

1st Year · Physics · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 85Time: 3 hours

Q1. Multiple choice questions (Attempt all · 17 × 1 = 17)

  1. If fingers of right hand show the direction of magnetic field and palm shows the direction of force, then thumb points for:

    1. Torque

    2. Voltage

    3. Current

    4. Inducted

  2. 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

  3. 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

  4. 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

  5. A frame of reference that is accelerating w.r.t. an inertial frame is called:

    1. Inertial

    2. Stationary

    3. Non-inertial

    4. Rotational

  6. The anti-particle of electron is:

    1. Proton

    2. Positron

    3. Neutrino

    4. Anti-proton

  7. Which force balance the magnetic attraction to prevent ferrofluids from settling?

    1. Buoyant force

    2. Brownian motion

    3. Electrostatic repulsion

    4. Gravitational pull

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

    1. Prism

    2. Convex lens

    3. Polaroid sheet

    4. Plane mirror

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

    1. Mass

    2. Charge

    3. Energy

    4. Momentum

  10. 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

  11. The concept of space-time combines:

    1. Space and gravity

    2. Mass and velocity

    3. Space and time into a four-dimensional continuum

    4. Time and space

  12. Which one of the following is the fundamental particle?

    1. Proton

    2. Neutron

    3. Electron

    4. Meson

  13. A current flowing towards the reader be denoted by:

    1. Cross

    2. A bracket

    3. A dot

    4. Positive sign

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

    1. Optical telescopes

    2. Radio telescopes

    3. LASER interferometry

    4. Gravitational lensing

  15. 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

  16. 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

  17. If an observer is moving in the same direction as a sound wave, the velocity of the wave seems to be:

    1. More

    2. Less

    3. Constant

    4. Sum of the two velocities

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 plane polarized light?

  3. What is coherent light?

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

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

  6. Write down some applications of plane polarized.

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

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

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

  10. What type of waves can be polarized?

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

  12. How are tidal forces formed?

Q3. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

  1. Is it possible to change both the area of the loop and the magnetic field passing through the loop and still not have an induced emf in the loop? Give reason.

  2. What is meant by zero electric potential?

  3. How does Lenz' law obey the law of conservation of energy?

  4. What factors affect the resistivity of a meterial?

  5. At a given instant, a proton moves in the position x-direction in a region where there is magnetic field in the negative z-irection. What is the direction of the magnetiv force? Wil the proton continue to move in the positive z-direction? Explain.

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

  7. A plane conducting loop is located in a uniform magnetic field that is directed along x-axis. For what orientation of the loop is the flux a maximum? For orientation is the flux a minimum?

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

  9. A sensitive galvanometer cannot be table. Explain?

  10. How is electron volt is related to charge of an electron?

  11. Electric force does work. while no work done by the magnetic force. why?

  12. How can you identify that which plate os positively charged?

Q4. Short questions (Attempt any 6 of 9 · 6 × 2 = 12)

  1. What is the effect of beta plus decay on the nucleus?

  2. What are the two postulates of special theory of relativity?

  3. State the role of Higgs Boson in the generation of mass in modern physics theories.

  4. Can an object with mass travel at the speed of light?

  5. Is radioactivity affected by temperature or pressure?

  6. What is a relative motion?

  7. Fill in the missing particle or nucleus:(a) (b)

  8. Does theory of relativity contradicts Newton's laws of motion? Explain briefly.

  9. What is the weakest and strongest fundamental force?

Q5. Long questions (Attempt any 3 of 5 · 3 × 8 = 24)

  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. Describe four fundamental forces in nature.

  3. Explain how ferrofluids work?

  4. 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.

  5. What is relative motion? How does it differ from absolute motion? Explain.