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Federal (FBISE) · Quarter book test · Free

10th Class Physics 4th Quarter Book Paper

40 marks · 1 hour · 28 questions. Covers: 19. Electromagnetism, 20. Electromagnetics waves, 21. Nuclear Physics.

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10th Class Physics 4th Quarter Book Paper

10th Class · Physics · Federal (FBISE)

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

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

  1. The phenomenon of blue sky and red sky is explained by:
    1. Dispersion of light
    2. Polarization of light
    3. Scattering of light
    4. Reflection of light
  2. The natural emission of radiations from unstable nuclei is called:
    1. Fusion
    2. Fission
    3. Radioactivity
    4. Ionization
  3. The induced current generated according to Lenz’s law always:
    1. Supports the motion of the magnet
    2. Opposes the motion of the magnet
    3. Stops the magnet
    4. Moves randomly
  4. Prolonged exposure to infrared waves can cause:
    1. Hearing loss
    2. Thermal damage and burns
    3. Muscle cramp
    4. Bone fracture
  5. Which radioactive element is commonly used in smoke alarms?
    1. Uranium-235
    2. Cobalt-60
    3. Americium-241
    4. Iodine-131
  6. When the switch in relay is ON:
    1. Lamp remains OFF
    2. Current stops
    3. Lamp glows
    4. Armature is disconnected
  7. Which type of light waves scatter more?
    1. Longer wavelengths
    2. Shorter wavelengths
    3. Equal wavelengths
    4. None of these
  8. Maximum dose limit for radiation workers in emergency situations is:
    1. 1 mSv
    2. 20 mSv
    3. 50 mSv
    4. 100 mSv
  9. The shaft on which the coil of an electric motor is mounted is called:
    1. Commutator
    2. Armature
    3. Brush
    4. Stator
  10. As frequency of electromagnetic waves increases, their wavelength:
    1. Increases
    2. Decreases
    3. Remains constant
    4. Remains constant
  11. Beta particles are:
    1. Protons
    2. Electrons
    3. Gamma rays
    4. Neutrons
  12. In electromagnetic induction, current is induced as long as:
    1. Magnet is stationary
    2. Magnet is in motion
    3. Coil is broken
    4. Galvanometer is removed

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

  1. Give two applications of infrared radiation in household devices.
  2. How does a smoke alarm detect fire particles?
  3. On what factor does the loudness of a loudspeaker depend?
  4. Explain how X-rays can increase the risk of cancer.
  5. Explain the plum pudding model of the atom.
  6. What is meant by couple in the context of a current carrying coil?
  7. What is infrared radiation and where is it commonly used?
  8. A radioactive substance has a half-life of 16 months. In how much time, one-eighth of the substance will be left?
  9. State the working principle of an electric motor.
  10. State one hazard of prolonged exposure to microwaves.
  11. How much energy is released in the fusion of four protons into helium?
  12. List any two factors affecting induced e.m.f.

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

  1. A transformer in an adapter steps up a 115 V to the 230 V needed for a hair dryer. A current of 5 A flows through the hairdryer. Assuming that the transformer is 100% efficient, calculate the current drawn from the mains supply.
  2. Break down the electromagnetic spectrum in terms of wavelength and frequency. Why is the speed of electromagnetic waves in air nearly the same as in a vacuum?
  3. Explain alpha decay in detail with example and mathematical expression.
  4. Calculate the input voltage if it draws 0.5 A. Also calculate the turn ratio of primary to secondary coil if a transformer is rated for an output of 100 W and 8.3 A. Also identify the type of transformer.