Worksheet Solutions: Light, Shadow and Reflections

Q1: Multiple Choice Questions (MCQs)

(ii) Why can we see objects on an illuminated page?
(a) Because it is a luminous object
(b) Because it absorbs light
(c) Because light reflects back from it
(d) Because it is a transparent object
Ans: (c)
Illuminated objects reflect light, making them visible.

(iii) What is solar energy?
(a) Only light energy
(b) Only heat energy
(c) Light and heat energy from the sun
(d) Energy from the moon
Ans: (c)
Solar energy includes both light and heat from the sun.

(iv) Which type of objects allow some amount of light to pass through them?
(a) Opaque objects
(b) Translucent objects
(c) Transparent objects
(d) Luminous objects
Ans: (b)
Translucent objects allow some light to pass through but not as much as transparent objects.

(v) When does a solar eclipse occur?
(a) When the Earth comes between the sun and the moon
(b) When the moon comes exactly between the sun and the Earth
(c) During a full moon night
(d) During a new moon night
Ans: (b)
A solar eclipse occurs when the moon blocks the sunlight from reaching certain regions on Earth.

Q2: Fill in the Blanks

(ii) An object that does not let light pass through it is called an __________ object.
Ans: Opaque.
Opaque objects block light, creating shadows.

(iii) Plants use sunlight to make their own __________.
Ans: Food.
Sunlight is crucial for photosynthesis, allowing plants to produce their own food.

(iv) A mirror forms a clear image because it has a smooth and __________ surface.
Ans: Polished.
A smooth and polished surface of a mirror reflects light, forming a clear image.

(v) The process through which living things produce light is known as __________.
Ans: Bioluminescence.
Fireflies, bacteria, and fungi exhibit bioluminescence, producing light without heat.

Q3: Match the Column (In a Table)

Ans:

Q4: True/False

(i) A translucent object allows all light to pass through.
Ans: False
A translucent object allows only some light to pass through, not all.

(ii) During a lunar eclipse, the Earth comes between the sun and the moon.
Ans: True
A lunar eclipse occurs when the Earth's shadow falls on the moon.

(iii) All luminous objects are natural sources of light.
Ans: False
Luminous objects can be natural (like the sun) or human-made (like bulbs).

(iv) Plants use moonlight to make their own food.
Ans: False
Plants use sunlight for photosynthesis, not moonlight.

(v) Rays of light in a beam are not parallel.
Ans: False
Rays of light in a beam are normally parallel, demonstrating rectilinear propagation of light.