Force and Laws of Motion — Science STD 9 — Question

A sample of pure water, irrespective of its source, contain 11.1% hydrogen and 88.9% oxygen. The data supports:

Choanocytes are unique to:

1. Protozoa.
2. Porifera.
3. Mollusca.
4. Echinodermata.

Ligament connects a bone with:

1. Skin
2. Muscle
3. Bone
4. Both (b) and (c)

0Law of conservation of mass is also known as:

Living organisms are used in:

1. Organic manure.
2. Biofertilizers.
3. Natural insecticides.
4. Pesticides.

Two masses m and 2m are dropped from certain height ‘h’. Then on reaching the ground:

Which one of the following fishes is a surface feeder?

If the mass of a body is M on the surfrace of the earth, then its mass on the surface of the moon will be:

Sieve tubes and companion cells occur in-

A block of mass 10kg is dropped from a height of 10m from the earth's surface and it falls onto a vertical heli spring of stiffness 5000N/ m and length 50cm as shown in the figure. The compression of the springs is (Take, g = 10m/ s)