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Learn RAILWAY MCQs with answers [Page 4 of Department 68]

M

Mahesh Chandra • 6.28K Points
Tutor III Physics

31) Sound becomes hazardous noise pollution at decibels?

(A) Above 120 db
(B) Above 80 db
(C) Above 50 db
(D) Above 30 db
Correct Answer - Option (B)

Explanation :
Sound levels are measured in decibels(dB), sound level of 80 or more dB can aptly be called noise which can cause serious hearing loss, tensions, high blood pressure, it can induce several disorders prematurely existing, such as hypertension, an increase in blood cholesterol level and is detrimental to health in other aspects when observed for more than maximum tolerable limit of 50 dB. Hence, the correct answer is 'Above 80 dB'.

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R

Ranjeet • 25.13K Points
Instructor II Science

38) If water in a lake were to behave like other liquids, then in extremely cold weather it would freeze

(A) simultaneously throughout the depth
(B) from bottom to top
(C) first on the surface, bottom and sides and then in the interior
(D) from top to bottom
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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R

Ranjeet • 25.13K Points
Instructor II Biology

39) Hemophilia is extremely rare in women because:

(A) the female sex hormone, estrogen, protects them
(B) they have no y chromosome that bears the gene for hemophilia
(C) the female pituitary hormone FSH provides them protection
(D) the gene for hemophilia is expressed in women only when such genes are paired which is extremely rare
Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

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