Which of the following statements are incorrect? a) the state of matter for an object that has a definite volume but not a definite shape is a liquid state b) the state of matter for an object that has both definite volume and definite shape is solid state c) the state of matter for an object that has a definite shape and is highly compressible is gaseous state d) the state of matter for an object that has no definite volume and takes the shape of its container is gaseous state e) the state of matter for an object that is rigid is solid state

a), b), d), and e) are correct.

Explanation:

c) is incorrect because an object that has a definite shape cannot be in a gaseous state as gaseous objects take the shape of their container.

a) is correct because objects that are liquid have definite volumes but no definite shapes as they take the shape of their containers,

b) is correct as this is the definition of an object which is in a solid state.

d) is correct as this is the definition of an object which is in a gaseous state.

e) is correct as rigidness, the quality of having a definite shape is only exhibited by objects that are in solid state.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.