Multiple choice question VIII — task. Science CBSE, Class 9.

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1. When the angle between force vector and displacement vector is obtuse, the work done is:

$1$
$zero$
$+ve$
$-ve$

2. Given that

$W\ =\ \vec{F}.{s}\ =\ 0$ and

$F \neq 0$ ,

$s \neq 0$ , then:

$\vec{F}$ is equal to $\vec{s}$
$\vec{F}$ is parallel to $\vec{s}$
$\vec{F}$ is perpendicular to $\vec{s}$
none of these

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