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Lesson 1: Light Reflection in Spherical Mirrors and Refraction in Convex and Concave Lenses — Lesson quiz

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  • Questions count: 5
  • Passing grade: 60%
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1.
Why is a concave lens used to correct short-sightedness (myopia)?
It converges light rays before they enter the eye
It magnifies distant objects like a telescope
It reflects light rays outward
It diverges light rays so the image forms precisely on the retina
2.
An ionic bond is formed primarily between:
Two non-metal atoms sharing pairs of valence electrons equally
Noble gas atoms at very low temperatures
A metal atom that loses electrons forming a cation and a non-metal atom that gains electrons forming an anion due to electrostatic attraction
Positive metal ions immersed in a sea of delocalized electrons
3.
Which of the following compounds exhibits polar covalent bonding due to a significant difference in electronegativity between 0.4 and 1.7?
Chlorine gas (Cl2)
Methane (CH4)
Sodium chloride (NaCl)
Water (H2O)
4.
The nitrogen molecule (N2) contains a:
Double covalent bond
Coordinate dative bond
Triple covalent bond (one sigma bond and two pi bonds) sharing 3 electron pairs
Single ionic bond
5.
Solid ionic compounds such as crystal NaCl do NOT conduct electricity in the solid state because:
Electrons are moving too rapidly
They contain no electrical charges
Their ions are tightly locked in fixed positions within the rigid crystal lattice and cannot move freely
They decompose in the presence of air
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