Question $1$ options:

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The energy grade line is horizontal.

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The velocity V$1$ is equal to zero.

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The pressure at $1$ is equal to zero.

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The distance between the energy $($grade$)$ line and the HGL is larger for pipe $3$ than pipe $2.$

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The pressure at $3$ is equal to zero.

$1.$

Flow is assumed to be frictionless. $$

$2.$

The fluid is open to the atmosphere.

$3.$

The velocity in pipe $3$ is greater than in pipe $2.$

$4.$

The velocity in pipe $2$ is greater than in pipe $3$

$5.$

The fluid is an a vacuum.

$6.$

The elevation is constant.

$7.$

The tank is$$ very large compared to the pipe sizes.

$8.$

The tank water level is equal to the EL$.$