Light Energy Quiz - ICSE Class 8 Science
Free practice quiz: Light Energy (ICSE Class 8 Science). 48 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
This ICSE Class 8 Science practice quiz has 48 multiple-choice questions on Light Energy, and 48 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.
Start quiz: 48 questions, freeSample questions
What property of light is responsible for the formation of shadows?
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Answer: C. Its rectilinear propagation
Rectilinear propagation means that light travels in straight lines. When an opaque object is placed in the path of light, it blocks the light, creating a shadow behind it because the light cannot bend around the object.
Which of the following colors has the longest wavelength in the visible spectrum?
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Answer: C. Red
In the visible spectrum, red light has the longest wavelength and the lowest frequency. Violet light has the shortest wavelength and the highest frequency.
Which phenomenon causes a rainbow to form?
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Answer: D. Refraction, dispersion, and internal reflection
Rainbows are formed when sunlight interacts with water droplets in the atmosphere. Sunlight is refracted as it enters a droplet, dispersed into its constituent colors, reflected internally off the back of the droplet, and then refracted again as it exits.
A convex mirror is also known as a:
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Answer: B. Diverging mirror
A convex mirror diverges parallel rays of light away from its surface. Therefore, it is also called a diverging mirror.
A lens that is thicker in the middle and thinner at the edges is a:
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Answer: B. Convex lens
A convex lens is defined by its shape: thicker at the center and tapering towards the edges. This shape allows it to converge parallel light rays to a focal point.
More questions in this quiz
Answers and explanations are in the full quiz.
- If a ray of light strikes a plane mirror at an angle of incidence of 30 degrees, what is the angle of reflection?
- Which of the following optical instruments uses the principle of reflection to form images?
- When white light passes through a prism, it splits into its constituent colors. This phenomenon is known as:
- Which color of light has the shortest wavelength and thus bends the most when passing through a prism?
- Which type of mirror always forms a virtual, erect, and diminished image?
- The phenomenon of twinkling of stars is due to:
- What is the unit of luminous flux, which measures the total amount of visible light emitted by a source?
- When an object is placed at the center of curvature (C) of a concave mirror, where is the image formed?
- The ability of a lens to converge or diverge light rays is called its:
- Why does the sky appear blue during the day?
- If you hold a magnifying glass (a convex lens) very close to a piece of paper and the sun is shining, what happens if you move the lens away from the paper?
- A concave lens is used to correct which vision defect?
- Which of the following is NOT a primary color of light?
- When light travels from a rarer medium to a denser medium, it bends:
- What is the term for the straight line drawn perpendicular to the reflecting surface at the point of incidence?
- A ray of light passes from water to air. It will bend:
- What is the focal length of a concave lens with a power of -2.5 D?
- The image formed by a concave lens is always:
- If the angle of incidence is 0 degrees, the angle of reflection will be:
- Which optical phenomenon is responsible for the shimmering effect of heat waves rising from a hot road?
- The phenomenon where light bends as it passes from one medium to another is called:
- Which device produces a spectrum of colors by dispersing white light?
- What is the nature of the image formed by a plane mirror?
- Which of the following is a characteristic of light?
- When light reflects off a smooth surface, the angle of incidence is equal to the angle of reflection. This is known as:
- The phenomenon of twinkling of stars is an example of:
- What is the SI unit of luminous intensity?
- If an object is placed between the pole (P) and the principal focus (F) of a concave mirror, the image formed is:
- Which of the following is NOT a property of a real image formed by a lens?
- Why do we see colors?
- When light undergoes total internal reflection, what is the angle of incidence compared to the critical angle?
- The bending of light around sharp edges or through small openings is called:
- What is the purpose of the iris in the human eye?
- Which of the following statements about reflection is incorrect?
- If white light is passed through a prism, what is the order of colors from least deviated to most deviated?
- Which part of the eye allows light to enter and controls its intensity?
- An object is placed 20 cm in front of a concave mirror of focal length 10 cm. The image formed will be:
- Which optical device uses the principle of refraction to produce a magnified, virtual image of an object when the object is placed within its focal length?
- What is the term for the straight line passing through the optical center of a lens and perpendicular to its plane?
- The blue color of the clear sky is due to the scattering of sunlight by:
- If a ray of light passes through the center of a convex lens, it will:
- Which phenomenon explains why a swimming pool appears shallower than it actually is?
- In a concave mirror, if the object is placed at infinity, the image formed is:
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