Matter in Our Surroundings — Science STD 9 — Question

The property/ properties which enable copper metal to be used for making electric wires is/ are:

1. Copper metal is malleable and ductile.
2. Copper metal is a good conductor of electricity.
3. Copper metal is ductile and has low electrical resistance.
4. Copper metal is sonorous and an excellent conductor of electricity.

In poultry farms, broilers are raised for their:

What is the approximate range of audible sound frequencies for a human with good hearing?

The ion of an element has 3 positive charges. The mass number of atom of this element is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

The desirable agronomic characters improved using crop variety programmes are called:

When we change sound to loud sound we increase its:

Compressions and rarefactions are seen in:

Membrane which allows passage of only solvent through it is:

Which of the following components of phloem is absent in monocot stem:

In angiosperms:

1. Xylem possess vessels.
2. Phloem has sieve tubes and companion.
3. Flowers are reproductive structures.
4. All the above.