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Subject :NSO    Class : Class 8

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) .

(i) (ii) (iii) (iv)
A Epicenter Seismograph Focus Seismologists
B Focus Seismology Epicenter Seismograph
C Focus Seismologists Epicenter Seismograph
D Epicenter Seismology Focus Seismologists


It’s seismograph that measures the strength of the earthquake.

Ans 1:

Class : Class 8
I agree. Statement two of the passage has a grammatical error, instead of the verb 'measures', it should be 'measure', otherwise subject-verb agreement is not achieved, and literary sense is not maintained.

Ans 2:

Class : Class 5
Measures ki jagah it shoud be measure , english

Ans 3:

Class : Class 7
There is a grammatical error in this question, which threw me off.

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