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Fresh sewage may become stale in

	six hours.
	two to three hours
	one hour
	three to four hours

three to four hours

The length and width of a meander and also the width of the river, vary roughly as

	discharge
	square of the discharge
	cube of the discharge.
	square root of the discharge

square root of the discharge

Sound travels 40 m during 20 vibrations its wavelength 1 is?

	4 m
	3 m
	2 m
	0.5 m

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

	1.25%
	2.0%.
	1.5%
	2.5%

2.5%

If an apple is released from an orbiting spaceship, it will

	move with lower speed
	move along the spaceship at the same speed
	fall towards the earth
	move at the higher speed

move along the spaceship at the same speed

For achieving suitably a low permeability

	low water - cement ratio is used
	proper curing is done for hydration
	strong and dense aggregates are used
	All the options

All the options

The acceleration due to gravity at the Earth's equator is less than at the poles because

	The Earth is spinning so fast at the equator
	The Earth is not round so that objects at the equator are further from the centre of the earth.
	The temperature is so hot at the Equator
	An object is spinning much faster at the poles

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 reflected wave pulse is on the same side, but the transmitted wave pulse is on the opposite side
	The transmitted wave pulse is on the same side, but the reflected wave pulse is on the opposite side Correct
	Both the transmitted and the reflected wave pulse are on the same side of the medium rest position Incorrect
	Both the transmitted and the reflected wave pulse are on the opposite side of the medium rest position

The transmitted wave pulse is on the same side, but the reflected wave pulse is on the opposite side Correct

Sound waves

	Are transverse waves that are composed of crests and troughs
	Are transverse waves that are composed of compressions and rarefactions
	Are longitudinal waves that are composed of compressions and rarefactions
	Are longitudinal waves that are composed of crests and troughs

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?

	8
	15
	16
	17

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