Question 4656:

When the Sun, the earth and the moon are in line during their movement, with the earth being the opaque object and casting its shadow on the moon, we have ____________

A. Lunar eclipse
B. Total eclipse
C. Partial eclipse
D. Annular eclipse

Question 4657:

Which of the following instruments could be used in finding angle of elevation of the sun?

A. Periscope
B. Telescope
C. Kaleidoscope
D. Sextant

Question 4658:

Which of the following optical instruments does not depend on the use of plane mirrors?

A. B Kaleidoscope
B. Simple microscope
C. Sextant
D. Simple periscope

Question 4659:

Which of the following statements supports the assumption that light travels in straight lines?

A. Light can be diffracted
B. Light can be reflected
C. A source of light produces interferences patterns on a suitably placed screen
D. A source of light produces distinct shadows of opaque objects

Question 4660:

Which of the following is correct about nuclear fission? It is ____________

A. The splitting of a heavy nucleus into two or more lighter particles
B. An agent used to slow down neutrons in a controlled atomic chain reaction
C. Combing light atomic nuclei to form heavy
D. The spontaneous disintegration occurring in the nucleus of certain atoms