Match the column I with column II Column 1 Column 2 (i) Richter Scale (a) Sudden shaking of the earth (ii) Waves recorder (b) Conductor (iii) Earthquake (c) Earthing (iv) Copper (d) Earthquake under sea (v) Transfer of charge to the earth (e) Lightning (vi) Tsunami (f) Seismograph (vii) Nitrogen Fixation (g) Power of earthquake (viii) Insulator (h) Plastic

(i) Richter Scale (g) Power of earthquake (i) to (g) Richter scale is in the range of 1 to 10 which is proportional to the intensity or power of the earthquake. (ii) Waves recorder (f) Seismograph (ii) to (f) Seismograph is used to measure and record the seismic waves produced due to the earthquake produced by the movement of tectonic plates. (iii) Earthquake (a) Sudden shaking of the earth (iii) to (a) Earthquake is the sudden shaking of the earth caused due to the movement of earth's crust plates and generate enormous pressure. (iv) Copper (b) Conductor (iv) to (b) Copper is a conductor. This metal is due to the presence of free electrons which move under the emf of the battery and cause flow of electricity. (v) Transfer of charge to the earth (c) Earthing (v) to (c) Transfer of charge to the earth by the lightning rod placed on the top of the building which carry enormous charge through the earthing wire and prevents the damage to building. (vi) Tsunami (d) Earthquake under sea (vi) to (d) Tsunami is the rise of high tides of water of the sea or ocean due to the disturbance or earthquake generated on the sea floor. This enormous energy get transfer to the sea waves and cause tsunami. (vii) Nitrogen Fixation (e) Lightning (vii) to (e) Nitrogen fixation in the earth's soil can be done by the lightning. Lightning causes the dissociation of atmospheric nitrogen and reacts with oxygen to form nitrogen dioxides which on dissolving in water droplets give rise to nitrates which can be directly fixed into the soil. (viii) to (h) Plastic is an insulator which don't allow the electricity to pass through it. Column 1 Column 2 (i) Richter Scale (g) Power of earthquake (ii) Waves recorder (f) Seismograph (iii) Earthquake (a) Sudden shaking of the earth (iv) Copper (b) Conductor (v) Transfer of charge to the earth (c) Earthing (vi) Tsunami (d) Earthquake under sea (vii) Nitrogen Fixation (e) Lightning (viii) Insulator (h) Plastic

Match the column I with column II Column I Column II (i) Rubbing (a) Electric Current (ii) Moving Charge (b) Seismic zone (iii) Weak zone (c) Static charge (iv) Electroscope (d) Repel each other (v) Like charges (e) Charge detecting device

(i) Rubbing (c) Static charge (i) to (c) Rubbing produce static charges on the surface which rub against each other. When insulators are rubbed against each other friction is present between the surface and produces heat and opposite charges are produces on both the surface. (ii) Moving Charge (a) Electric Current (ii) to (a) Moving charges produce electricity. In conductor the free electrons are present which under the external electrostatic field experience force and start moving to produce electric current. (iii) Weak zone (b) Seismic zone (iii) to (b) Weak zones are seismic zone that are more prone to the earthquake due to the presence of tectonic plates boundaries nearby which on movement cause high pressure waves to cause earthquake. (iv) Electroscope (e) Charge detecting device (iv) to (e) Electroscope is used to detect whether an object is charged or not. Electroscope consist of metal rod vertically attached to two gold leaves which on touching charged object fall apart due to like charges. (v) to (d) Like charges or both charges are tends to repel each other while unlike charges where one is positive and other one is negative which tends to attract each other. Column I Column II (i) Rubbing (c) Static charge (ii) Moving Charge (a) Electric Current (iii) Weak zone (b) Seismic zone (iv) Electroscope (e) Charge detecting device (v) Like charges (d) Repel each other

E M B I B E

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice

Arjun Sharma, Seema Mehra and, Shikha Sharma Solutions for Chapter: Some Natural Phenomena, Exercise 5: Chapter Practice

Author:Arjun Sharma, Seema Mehra & Shikha Sharma

Arjun Sharma Science Solutions for Exercise - Arjun Sharma, Seema Mehra and, Shikha Sharma Solutions for Chapter: Some Natural Phenomena, Exercise 5: Chapter Practice

Attempt the practice questions on Chapter 15: Some Natural Phenomena, Exercise 5: Chapter Practice with hints and solutions to strengthen your understanding. All in One - SCIENCE CBSE Class 8 solutions are prepared by Experienced Embibe Experts.

Questions from Arjun Sharma, Seema Mehra and, Shikha Sharma Solutions for Chapter: Some Natural Phenomena, Exercise 5: Chapter Practice with Hints & Solutions

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice>Q 7

Bathing outdoors should be avoided during a thunderstorm.

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice>Q 8

Similar charges attract each other.

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice>Q 9

We should build heavy houses in a danger zone

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice>Q 10

Mantle is the outermost layer of the earth

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice>Q 11

An earthquake is measured by an instrument called electrocardiograph.

MEDIUM

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice>Q 12

Earthquake can be predicted in advance.

MEDIUM

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice>Q 1

Match the column I with column II

Column 1	Column 2
(i) Richter Scale	(a) Sudden shaking of the earth
(ii) Waves recorder	(b) Conductor
(iii) Earthquake	(c) Earthing
(iv) Copper	(d) Earthquake under sea
(v) Transfer of charge to the earth	(e) Lightning
(vi) Tsunami	(f) Seismograph
(vii) Nitrogen Fixation	(g) Power of earthquake
(viii) Insulator	(h) Plastic

MEDIUM

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 15 - Some Natural Phenomena>Chapter Practice>Q 2

Match the column I with column II

Column I	Column II
(i) Rubbing	(a) Electric Current
(ii) Moving Charge	(b) Seismic zone
(iii) Weak zone	(c) Static charge
(iv) Electroscope	(d) Repel each other
(v) Like charges	(e) Charge detecting device

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