All part answer please explain

Which of these is not a state of matter O Solid O Liquid Plasma O Ice QUESTION 10 A piece of steel expands 10 cm when it is heated from 20 to 40 deg C. How much would it expand if it was heated from 20 to 60 deg.C? 10 am O 20 Em none of the above QUESTION 11 A pendulum has a period of 5 seconds. What is its frequency? O 2 h O I Mha O 25 QUESTION 12 The velocity of sound in a certain medium is 1000 m/'s. If sound wave has a frequency of 500 hz, the wavelength would be 200 m :500 m O 2m 500,000 m