Fresh sewage may become stale in
three to four hours
The length and width of a meander and also the width of the river, vary roughly as
square root of the discharge
Sound travels 40 m during 20 vibrations its wavelength 1 is?
2 m
An error of 1% in measuring the head of water over the crest of a triangular notch, produces an error in the discharge which is equal to
2.5%
If an apple is released from an orbiting spaceship, it will
move along the spaceship at the same speed
For achieving suitably a low permeability
All the options
The acceleration due to gravity at the Earth's equator is less than at the poles because
The Earth is not round so that objects at the equator are further from the centre of the earth.
When a wave pulse crosses the boundary from a fast medium into a slow medium
The transmitted wave pulse is on the same side, but the reflected wave pulse is on the opposite side Correct
Sound waves
Are longitudinal waves that are composed of compressions and rarefactions
Red light of wavelength 625 nm is incident normally on an optical diffraction grating with 2' 105 lines/m. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?
17
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