Sound — Science STD 9 — Question

A mixture is a/ an :

Who postulated that matter is made up of very small particles in 430 BC?

Which of the following are compounds?

1. CO
2. No
3. NO
4. Co

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iii)
4. (ii) and (iv)

Contractile proteins are found in:

The rusting of an iron object is called:

Which of the following frequency of sound can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros?

1. 5kHz
2. 25Hz
3. 10Hz
4. 15,000Hz

Cells are able to live and perform its functions due to the presence of __________.

Below the skin, the fat is in the form of ____________?

Mixed cropping ______:

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.