Subject :NSO Class : Class 5
Subject :NSO Class : Class 9
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Subject :NSO Class : Class 8
Ans 3:
Class : Class 8
The correct answer would be B only because due to high humidity, particles would be closer to each other, which would cause the soundwave to propagate more easily, as it travels fastest in solids. Though the reason is correct in itself it is not the the proper reason for the assertion as the correct reason should be due to the closeness of the particles.
Ans 4:
Class : Class 8
As said in the solution, velocity of sound increases with increase in humidity.Also, the 2nd statement is correct, since the velocity of sound is inversely proportional to the density in the medium. Hence, statement 1 is false, while statement 2 is true. The answer should be Option D. SOF, PLEASE RECTIFY ALL THESE ERRORS.
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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 2:
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.
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Subject :NSO Class : Class 6
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Subject :NSO Class : Class 6
Ans 1: (Master Answer)
Class : Class 1
D
A periodic motion may or may not be oscillatory .For example , motion of earth about sun is periodic but not oscillatory.
During circular motion of an object , its direction of motion changes with time and hence the velocity.So,the acceleration of the object is non zero.
Aluminium is a good conductor of electricity .Hence, statement v is wrong.
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 4