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Some Natural Phenomena Worksheet

           Objective Type Questions

  1. Fill in the blanks:
    The crust and mantle are broken into pieces known as __________. 

  2. Find the odd one out:   
    Floods, Lightning, Landslides, Tsunamis 

  3. Match the following: 

  4. State whether the statement is true or false:
    The weak zones where earthquakes are more likely to occur are called fault zones.

    Multiple Choice Questions

  5. The movement of the earth’s plates causes
    (a) cyclones
    (b) lightning
    (c) earthquake
    (d) thunderstorms

  6. Two charged objects are brought close to each other. Choose the most appropriate statement from the following options
    (a) They may attract
    (b) They may repel
    (c) They may attract or repel depending on the type of charges they carry
    (d) There will be no effect

  7. The earth’s plate responsible for causing earthquakes is
    (a) the crust of the earth         
    (b) the mantle of the earth
    (c) the inner core of the earth
    (d) the outer core of the earth

  8. An electroscope is a device that is used to
    (a)detect whether an object is a conductor or insulator
    (b)measure the amount of charge on an object
    (c)detect whether an object is charged or not
    (d)check the magnetic properties of a substance 

  9. The outermost layer of the earth is called
    (a) mantle
    (b) outer core
    (c) crust
    (d) inner core

    Subjective Questions

  10. Name other natural calamities except for lightning and earthquake.

  11. What causes lightning?

  12. What happens when amber is rubbed with fur?

  13. What are seismic waves?

  14. A charged plastic straw is brought near another suspended plastic straw, which is
    (a) similarly charged
    (b) uncharged.
    Explain what we would observe in each case and why?

  15. What is the static charge? How does it differ from an electric current?

  16. What is the electric discharge?

  17. What safety measures should be taken during lightning and thunderstorm?

    Assertion-Reasoning Questions

    Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: 

  18. Assertion: The charged body gets discharged when touched by hand.
    Reason: The electric charge present on the charged body flows to the earth through the hand. 

  19. Assertion: Richter scale is linear.
    Reason: The earthquake of magnitude 8 has 1000 times more destructive energy than that of magnitude 6.

    Case-Based Questions

  20. An earthquake is just the shaking of the ground. It happens due to the energy released, which makes waves move in all directions. When an earthquake occurs, the earth vibrates, producing seismic waves which are detected by seismographs. The north-eastern region of the country as well as the entire Himalayan belt, is susceptible to great earthquakes of magnitude more than 8.0. The main cause of earthquakes in these regions is the movement of the Indian plate towards the Eurasian plate at the rate of about 50 mm per year. Besides the Himalayan region and the Indo-Gangetic plains, even peninsular India is prone to damaging earthquakes, as clearly illustrated by Koyna (1967), Latur (1993), and Jabalpur (1997) earthquakes. Earthquake magnitude is a measure of the size of the earthquake reflecting the elastic energy released by the earthquake. It is referred to by a certain real number, e.g., a magnitude 6.5 earthquake. On the other hand, earthquake intensity indicates the extent of shaking experienced at a given location due to a particular earthquake.
    (a)What is the difference between earthquake magnitude and earthquake intensity?
    (b)Which waves are detected using a seismograph?
    (c)Which regions are susceptible to earthquakes of higher magnitude?
    (d)Which places in India are referred to as earthquake-prone areas? 

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