10th Class Physics Chapter 6 Test15. Electrostatics

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

1. The process used in photocopiers is called:
   1. Polarization
   2. Xerography
   3. Magnetography
   4. Ionization
2. Placing an insulator in humid conditions helps in discharging because:
   1. Humid air absorbs heat
   2. Water molecules act as conductors
   3. Humid air neutralizes protons
   4. None
3. What causes the leaves of an electroscope to move apart when charged?
   1. Attraction of unlike charges
   2. Repulsion of like charges
   3. Neutral nature of leaves
   4. Air pressure
4. Free electrons in conductors are also called:
   1. Valence electrons
   2. Nucleons
   3. Mobile electrons
   4. Static electrons
5. The speed of lightning strike towards the ground can be up to:
   1. 1,000 km/s
   2. 10,000 km/s
   3. 100,000 km/s
   4. 1 km/s
6. Grounding is the process of:
   1. Transferring protons to Earth
   2. Connecting to Earth for excess charge to escape
   3. Producing positive charges
   4. Producing negative charges
7. The function of an electrostatic precipitator is to:
   1. Produce electricity
   2. Extract dust and smoke particles
   3. Generate current
   4. Remove gases
8. In insulators, electrons are:
   1. Loosely bound
   2. Strongly bound
   3. Free to move
   4. All of these
9. Electric field lines were first introduced by:
   1. Newton
   2. Coulomb
   3. Michael Faraday
   4. Maxwell
10. Corona discharge appears as:
    1. Red sparks
    2. Faint purple glow around sharp conductors
    3. Bright yellow lines
    4. White arcs