Matter in Our Surroundings — Science STD 9 — Question

The number of valence electrons in a sulphide ion, S^2-, is:

1. 16
2. 10
3. 9
4. 8

What happens when a solid melts:

Which of the following represent the suitable condition for the liquefaction of gases?

1. Low temperature, low pressure.
2. High temperature, low pressure.
3. Low temperature, high pressure.
4. High temperature, high pressure.

Parenchyma is a type of ________.

1. Complex tissue
2. Simple tissue
3. Xylem
4. Phloem

Work done is said to be positive when a force causes displacement:

Who discovered Endoplasmic reticulum?

‘Note’ os a sound:

1. Of a mixture of several frequencies.
2. Of mixture of only two frequencies.
3. Of a single frequency.
4. Always unpleasant to listen to.

What do you mean by Thrust or Buoyant force?

......... is said to be done only when the force applied on a body makes the body to move:

Is it possible for an object's velocity to increase while its acceleration decreases?