8th Class Science Some Natural Phenomena Question Bank

done Some Natural Phenomena Total Questions - 20

• question_answer1)
  A student named the diagrammatic representation of how an earthquake occurs wrongly. What is the correct sequence starting from the (i)?
  A)

  (i)	(ii)	(iii)
  Epicentre	Focus	Seismic waves

  done clear
  B)

  (i)	(ii)	(iii)
  Focus	Epicentre	Seismic waves

  done clear
  C)

  (i)	(ii)	(iii)
  Seismic	Focus	Epicentre waves

  done clear
  D)

  (i)	(ii)	(iii)
  Epicentre	Seismic	Focus waves

  done clear
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• question_answer2)
  When we rub glass rod with fur, the glass rod will acquire
  A)
  Positive charge done clear
  B)
  Negative charge done clear
  C)
  Either positive or negative charge done clear
  D)
  Neither positive nor negative charge done clear
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• question_answer3)
  Consider the following statements and select the correct option which correctly identifies true (T) and false (F).

  (i)  A charged object can attract something that is neutral.

  (ii) An atom that gains electrons becomes positively charged.

  (iii) Charges are only transferred from one body to another.

   
  A)

  (i)	(ii)	(iii)
  T	F	T

    done clear
  B)

  (i)	(ii)	(iii)
  F	T	F

    done clear
  C)

  (i)	(ii)	(iii)
  F	F	T

    done clear
  D)

  (i)	(ii)	(iii)
  T	T	F

    done clear
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• question_answer4)
  Two electroscope one positively charged (X) and the other negatively charged (Y) are connected with a copper wire as shown in figure. Which of the following will happen?
  A)
  Electrons will move from X to Y. done clear
  B)
  Protons will move from X to Y. done clear
  C)
  Electrons will move from Y to X. done clear
  D)
  Protons will move from Y to X. done clear
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• question_answer5)
  Which of the following shows the distribution of charges on a neutral metal sphere when a negatively charged balloon is brought near it? (Assume metal sphere is at insulating stand.)
  A)
                           done clear
  B)
         done clear
  C)
                  done clear
  D)
             done clear
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• question_answer6)
  Read the given statements and select the correct option.

  Statement 1: It is easier to generate static electricity on cold, dry winter days than on warm, humid days.

  Statement 2: Moisture present in the air carries away charges from the charged surface.

  A)
  Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
  Statement 1 is true but statement 2 is false. done clear
  D)
  Both statements 1 and 2 are false. done clear
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• question_answer7)
  Which of the following statements is incorrect?
  A)
  The lithosphere floats on the mantle. done clear
  B)
  Earthquakes occur along the boundaries of tectonic plates. done clear
  C)
  The tectonic plates meet at fault lines. done clear
  D)
  Earth's crust is made up of molten rocks. done clear
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• question_answer8)
  Which of the following diagrams X and Y shows charging by conduction and charging by induction ? (Assume stands are insulating.)
  A)

  X	Y
  Induction	Conduction

                  done clear
  B)

  X	Y
  Conduction	Induction

                  done clear
  C)

  X	Y
  Induction	Induction

                  done clear
  D)

  X	Y
  Conduction	Conduction

  done clear
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• question_answer9)
                     If air and cloud were good conductor of electricity then
  A)
  A lightning could occur with high intensity done clear
  B)
  Lightning could occur with lower intensity done clear
  C)
  Lightning could not occur at all done clear
  D)
  None of these done clear
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• question_answer10)
  Which of the following is the best thing to do during heavy lightning?
  A)
  Lying on the ground in an open place done clear
  B)
  Going into the nearest water body done clear
  C)
  Staying indoors away from metallic doors or windows done clear
  D)
  Standing under a tall tree done clear
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• question_answer11)
  Electroscope is used
  A)
  To detect and test small electric charges done clear
  B)
  To calculate the amount of electric charge flowing through the conductor in the given interval of time done clear
  C)
  To find out the presence of antimatter done clear
  D)
  To test the presence of magnetic field. done clear
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• question_answer12)
  Which of the following scales is/are not linear in nature?

  (i)   Decibel

  (ii)  Richter

  (iii) Meter

   
  A)
  (i) only              done clear
  B)
  (ii) and (iii)         done clear
  C)
  (ii) only  done clear
  D)
  (i) and (ii) done clear
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• question_answer13)
  Which of the following plays an important role in the early-warning systems for cyclones?
  A)
  Helicopters                     done clear
  B)
  Submarines        done clear
  C)
  Satellites            done clear
  D)
         Stars done clear
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• question_answer14)
  Which of these things would you do if you live in the earthquake prone area?

  (i) You would always keep an emergency kit ready.

  (ii) You would have only open book shelves and open cupboards in your house.

  (iii) You would fix the cupboards to the walls.

  (iv) You would not keep breakable items on the upper shelves.

  A)
  Only (iii) is correct. done clear
  B)
  Both (i) and (ii) are correct. done clear
  C)
  (i), (iii) and (iv) are correct. done clear
  D)
  All are correct. done clear
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• question_answer15)
  When we remove polyester or woollen cloth in dark, we can see spark and hear a cracking sound. These are due to
  A)
  Static electricity done clear
  B)
  Current electricity done clear
  C)
  Reflection of light done clear
  D)
  Refraction of light. done clear
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• question_answer16)
  Match the column I with the column II and select the correct option.

  Column I	Column II
  (a) Electrically neutral particle	(i) Copper
  (b) The charges acquired by a glass rod rubbed with silk cloth	(ii) Neutron
  (c) Unlike charges	(iii) Positive
  (d) Lightning rod	(iv) Attract each other

   
  A)
  (a) - (i), (b) - (ii), (c) - (iii), (d) - (iv) done clear
  B)
  (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) done clear
  C)
  (a) - (iii), (b) - (iv), (c) - (i), (d) - (ii) done clear
  D)
  (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii) done clear
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• question_answer17)
  In the given figure, layers of Earth are shown. Identify A, B, C and D respectively, and choose the correct option.
  A)

  A	B	C	D
  Outer core	Mantle	Crust	Inner core

  done clear
  B)

  A	B	C	D
  Inner core	Outer core	Mantle	Crust

  done clear
  C)

  A	B	C	D
  Mantle	Crust	Inner core	Outer core

  done clear
  D)

  A	B	C	D
  Crust	Mantle	Inner core	Outer core

  done clear
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• question_answer18)

  Read the following passage and select the option which correctly fill blanks (i), (ii), (iii) and (iv).

  ___(i)___ is the point of origin of an earthquake. ___(ii)___ measures the strength of an earthquake by estimating the amount of energy released at the focus. The point vertically above the origin point on the surface of the Earth, is ___(iii)___. Seismic waves are detected, recorded and measured by ___(iv)___.

   
  A)

  (i)	(ii)	(iii)	(iv)
  Epicenter	Seismograph	Focus	Seismologists

    done clear
  B)

  (i)	(ii)	(iii)	(iv)
  Focus	Seismology	Epicenter	Seismograph

  done clear
  C)

  (i)	(ii)	(iii)	(iv)
  Focus	Seismologists	Epicenter	Seismograph

  done clear
  D)

  (i)	(ii)	(iii)	(iv)
  Epicenter	Seismology	Focus	Seismologists

  done clear
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• question_answer19)
  Earthquakes at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and the destructive energy at A and B can be compared as
  A)
  Tremors at B are two times those at place A done clear
  B)
  Tremors at B are four times those at place A done clear
  C)
  Tremors at B are 100 times those at place A done clear
  D)
  Tremors at B are 1000 times those at place A. done clear
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• question_answer20)
  A negatively charged rod is moved near conducting sphere as shown. What will be the movements of the electrons and protons in the conducting sphere?
  A)

  Electrons	Protons
  move to left	move to right

                  done clear
  B)

  Electrons	Protons
  move to right	move to left

                  done clear
  C)

  Electrons	Protons
  does not move	move to left

                  done clear
  D)

  Electrons	Protons
  move to right	does not move

  done clear
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