Is Matter Around Us Pure ? — Science STD 9 — Question

Which of the following statement best describe frequency?

1. The maximum disturbance caused by a wave.
2. The number of complete vibrations per second.
3. The distance between one crest of a wave and the next one.
4. The distance travelled by a wave per second.

Area under a v – t graph represents a physical quantity which has the unit:

What property of an element determines its chemical behaviour?

The waves propagating on water surface are:

While doing onion peeling experiment, what is the most common problem faced in it?

Why is dwarfness preferred in cereal crops?

Whose living cells provide tensile and mechanical strength?

1. Collenchymas.
2. Sclerenchyma.
3. Phloem.
4. Sclereids.

The SI unit of force is:

Benzene and water can be separated by:

Animal cell lacking nuclei would also lack in: