Q 1 – Like charges
(a) attract each other
(b) repel each other
(c) no interaction takes place
(d) none of these
Q 2 –Lightning occurs due to
(a) wind
(b) rain
(c) electric discharge
(d) earthquake
Q 3 –The magnitude of an earthquake is measured in
(a) Kelvin scale
(b) Celsius scale
(c) Decibel scale
(d) Richter scale
Q 4 –Major earthquakes are less likely to occur in
(a) North-East India
(b) Rajasthan
(c) Rann of Kutch
(d) Odisha
Q 5 –Tsunami means
(a) floods
(b) earthquake
(c) earthquake under sea
(d) volcanic eruption under sea
Q 6 –The outermost layer of the earth is called
(a) mantle
(b) outer core
(c) crust
(d) inner core
Q 7 –Types of charges gained by rubbing objects are
(a) 3
(b) 2
(c) 4
(d) 1
Q 8 –The point from where the shock waves of an earthquake originate is called
(a) epicentre
(b) seismic focus
(c) focal depth
(d) none of these
Q 9 –Which of the following is not likely to cause tsunami?
(a) Nuclear explosion under sea
(b) Earthquake
(c) Volcanic eruption
(d) Lightning
Q 10 –During lightning air is normally
(a) a good conductor
(b) a bad conductor
(c) both (a) and (b)
(d) none of these
Q 11 –Fill in the blanks
- Lightning is an __________ on a huge scale.
2. The electrical charges generated by rubbing two object is__________ electricity.
3. The electrical charges can be transferred from a __________ object to another through a __________ conductor.
4. The crust and mantle is broken into pieces known as __________
5. __________ is an instrument that records seismic waves.
Q 12 –True or false
1. We can predict an earthquake.
2. Richter scale is used to measure earthquake.
3. We cannot predict cyclones.
4. The electric charges produced by rubbing are called static charges.
5. The process of transferring charge from a charged object to the earth is called earthing.
Q 13 –Match the following
Column A | Column B |
1. Electroscope | (a) Static charge |
2. Fault zone | (b) Meeting of positive and negative charges |
3. Electric discharge | (c) Charge detecting device |
4. Richter scale | (d) Seismic zone |
5. Rubbing | (e) Earthquake |
Q 14 –What do you mean by electric discharge? How does it occurs?
Q 15 –How does electric discharge occur in clouds?
Q 16 –What are fault zones? Name the fault zones in India.
Q 17 –What is lightning? How does lightning strike?
Q 18 –Explain the process of electric discharge.
Q 19 –What safety measures should be taken during lightning and thunderstorm?
Q 20 –What is an earthquake? What causes an earthquake?
Q 21 –What are the measures we should adopt to protect against an earthquake?
Q 22 –Ms Neena, Science teacher of class VIII, taught children how to protect themselves and what to do during an earthquake. She even performed an earthquake drill in school for better understanding in children. Children enjoyed this drill and learned a lot from this.
(a) What to do during an earthquake if you are stuck indoor?
(b) What causes earthquakes?
(c) How you must keep yourself ready for an earthquake?
(d) What values of Ms Neena is shown here?
Q 23 –If aluminium strips of an electroscope are replaced by plastic strips and a charged body is brought in contact with the metal clip. What will happen?
Q 23 –If aluminium strips of an electroscope are replaced by plastic strips and a charged body is brought in contact with the metal clip. What will happen?
Q 24 –During construction of a building, the lightning conductor was a little shorter and cannot be buried in the ground. Would the lightning conductor be still effective? Explain.
Q 25 –The strips of an electroscope diverge when a charged body is brought in contact with the metal clip.
What will happen to the strips if we gently touch the metal clip with hands?