Yes, it is the correct option. Light can fully pass through air, hence it is transparent and not translucent. 

Yes, light always travels in a straight line. Once the tube is bent at some angle, it is not possible to see the source of light through it. This happens because light travels in a straight line.

Yes, it is the correct answer. A pinhole camera is composed of two boxes. One of the boxes fits snugly inside the other box and can be slid to and fro.

Yes, it is the correct. The Moon does not have light of its own, it reflects sunlight and is visible. The rest are all luminous objects, hence the Mmoon is the correct answer.

Yes, it is the correct answer. One can get an inverted and real image in a pinhole camera. A pinhole camera is a simple camera without a lens and with a single small aperture, a pinhole. Light from a scene passes through this single point and projects an inverted image on the opposite side of the box.

Yes, a shadow cast by the Earth on the Moon is a lunar eclipse. Conversely, a shadow cast by the Moon on the Earth is a solar eclipse.

Yes, it is correct. When light falls on a shiny surface, the light rays bounce back. This phenomenon is called the reflection of light. A mirror is a surface from which most of the incident light gets reflected.

Yes, it is the correct answer. Paper is an opaque objec,  but if oil is spilled on it, it becomes translucent. It is because partial light can now pass through it.

Yes, it is the correct option, as both a and b are correct. 

Yes, it is the correct answer. It is not possible to see the reflection in a mirror in a completely dark room. He will need light to see anything.

Yes, it is correct. Luminosity is the measure of the Sun's apparent brightness and distance. The light produced by it allows us to see objects around us.

Yes, it is correct. This shaded region surrounding the dark central portion of a sunspot (umbra) is the penumbra. A Penumbra is not as dark as the umbra region. It is light shaded part surrounding the dark shadow.

Yes, it is the correct answer. Upon heating, a non-luminous object becomes a luminous object.

Yes, it is the correct answer. Both are the correct statements. When light falls on an object, it is visible and light travels in a straight line.

Yes, it is the correct answer. A firefly gives out light of its own, hence it is luminous. It is placed in the column of non-luminous objects, which is wrong.