10TH CBSE SCIENCE light reflection 50 MCQS QUIZ

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Light Reflection & Refraction

5 Theory-Based MCQ Tests • 10 Questions Each • 50 Questions

Instructions

• 5 separate tests with 10 questions each.
• Only theory/concept-based questions are included.
• Submit a test to calculate your score.
• Correct answers remain hidden until the password is entered.

Password required after submission to reveal correct answers.

Test 1 — Mirrors & Focal Length

10 questions • 1 mark each

1. For determining the focal length of a concave mirror using a distant object, which type of object gives the best result?

A. A nearby candle B. A well-illuminated distant object C. A dark object close to the mirror D. A transparent object

2. When a distant object is focused sharply by a concave mirror on a screen, where is the image formed?

A. At the pole B. At the focus C. At the centre of curvature D. Behind the mirror

3. Which distance should be measured to determine the focal length of a concave mirror using a distant object?

A. Object to mirror B. Object to screen C. Mirror to screen D. Object to pole only

4. The image of a distant object formed by a concave mirror is generally:

A. Virtual, erect and enlarged B. Real, inverted and diminished C. Virtual, inverted and enlarged D. Real, erect and diminished

5. A concave mirror can form a real image of a distant object because the reflected rays:

A. Diverge from the mirror B. Converge at the focus C. Remain parallel after reflection D. Pass behind the mirror

6. Why is a well-lit distant object preferred for determining the focal length of a concave mirror?

A. It produces a very large virtual image B. It gives a sharp image close to the focus C. It prevents reflection D. It makes the mirror transparent

7. If a student changes from a nearby object to a distant object while using a concave mirror, the screen generally needs to be moved:

A. Away from the mirror B. Towards the mirror C. Behind the object D. Sideways only

8. Which apparatus is appropriate for determining the focal length of a concave mirror?

A. Only a mirror B. A mirror, screen, holders and a scale C. Only a screen and scale D. Only a candle and mirror

9. When the object is at infinity, the rays incident on a concave mirror are considered:

A. Highly divergent B. Approximately parallel C. Perpendicular to the mirror surface D. Completely scattered

10. If the screen is removed after focusing a distant object with a concave mirror, the image:

A. Disappears completely B. Still exists at the focus C. Becomes virtual behind the mirror D. Becomes erect and enlarged

Correct answers are locked.

Test 2 — Convex Lens & Image Formation

10 questions • 1 mark each

1. A convex lens is called a converging lens because it:

A. Always diverges parallel rays B. Converges parallel rays towards a focus C. Reflects all incident rays D. Absorbs light at its centre

2. A distant object viewed through a convex lens forms its image approximately at the:

A. Optical centre B. Principal focus C. Centre of curvature D. Object position

3. The image of a distant object formed by a convex lens on a screen is generally:

A. Virtual, erect and enlarged B. Real, inverted and diminished C. Virtual and diminished D. Real, erect and enlarged

4. For determining the focal length of a convex lens using a distant object, what should be measured?

A. Distance between object and lens only B. Distance between lens and screen C. Distance between object and screen only D. Diameter of the lens

5. Which sequence is appropriate for finding the focal length of a convex lens using a distant object?

A. Measure first, then select object B. Select distant object, place screen, place lens and adjust for sharp image, then measure C. Place lens after measuring the screen distance D. Remove the screen before focusing

6. A ray parallel to the principal axis of a convex lens, after refraction, passes through the:

A. Optical centre B. Principal focus C. Pole D. Centre of curvature

7. A ray passing through the optical centre of a thin convex lens generally emerges:

A. With a large deviation B. Without appreciable deviation C. Back along the incident path D. Parallel to the principal axis in every case

8. A ray passing through the principal focus before reaching a convex lens emerges:

A. Parallel to the principal axis B. Through the optical centre C. Back towards the object D. Perpendicular to the axis

9. If a convex lens forms a magnified real image on a screen, the image is:

A. Erect B. Inverted C. Always virtual D. Always diminished

10. Removing the screen after a convex lens has formed a real image does not remove the image because:

A. The screen creates the image B. The image is formed by the lens whether or not the screen is present C. The image is stored in the screen D. The lens becomes a mirror

Correct answers are locked.

Test 3 — Refraction Through Glass Slab

10 questions • 1 mark each

1. When light travels from air into glass, it generally bends:

A. Away from the normal B. Towards the normal C. Along the surface D. Back towards the source

2. In a rectangular glass slab, the angle of incidence is generally:

A. Less than the angle of refraction B. Equal to the angle of emergence and greater than the angle of refraction C. Greater than the angle of emergence only D. Always zero

3. The emergent ray from a rectangular glass slab is:

A. Parallel to the incident ray B. Perpendicular to the incident ray C. Always along the normal D. Always reflected back

4. The angle of emergence is measured between the:

A. Incident ray and surface B. Emergent ray and normal C. Refracted ray and surface D. Incident ray and emergent ray

5. The angle of refraction is measured between the:

A. Refracted ray and normal B. Incident ray and surface C. Emergent ray and surface D. Incident ray and emergent ray

6. What happens to a ray when it passes from a denser medium to a rarer medium?

A. It bends towards the normal B. It bends away from the normal C. It stops completely D. It is always reflected

7. The sideways shift between the original path of the incident ray and the emergent ray through a glass slab is called:

A. Deviation B. Lateral displacement C. Focal length D. Magnification

8. Why should the incident ray not fall normally on a rectangular glass slab in the tracing experiment?

A. It would produce too much colour B. Refraction would not be clearly traced C. The slab would become opaque D. The ray would be absorbed

9. In the glass slab experiment, the angle of incidence and angle of emergence are:

A. Always unrelated B. Equal or nearly equal C. Always complementary D. Always unequal

10. A major conclusion from tracing light through a rectangular glass slab is that the incident and emergent rays:

A. Are parallel to each other B. Always meet inside the slab C. Are perpendicular D. Have different directions without parallelism

Correct answers are locked.

Test 4 — Prism & Dispersion

10 questions • 1 mark each

1. When a ray passes through a glass prism, the emergent ray is generally:

A. Parallel to the incident ray B. Bent at an angle to the incident direction C. Perpendicular to the incident ray in every case D. Unchanged in direction

2. The angle between the incident ray and emergent ray of a prism is called the:

A. Angle of refraction B. Angle of incidence C. Angle of deviation D. Angle of emergence

3. When light enters a glass prism from air, it travels from a rarer to a denser medium and bends:

A. Towards the normal B. Away from the normal C. Along the surface D. Backwards

4. When light emerges from a glass prism into air, it bends:

A. Towards the normal B. Away from the normal C. Without refraction D. Only towards the base

5. The angle between a prism's two refracting faces is called the:

A. Angle of incidence B. Angle of deviation C. Angle of prism D. Angle of emergence

6. The angle of incidence is the angle between the incident ray and the:

A. Surface of the prism B. Normal to the first face C. Emergent ray D. Base of the prism

7. The angle of emergence is the angle between the emergent ray and the:

A. Normal to the emergent face B. Base of the prism C. Incident ray D. Principal axis

8. Dispersion of white light by a glass prism produces:

A. Only red light B. A spectrum of colours C. Only blue light D. No change in colour

9. In the dispersion of white light through a prism, the two extreme colours are:

A. Red and orange B. Violet and red C. Green and blue D. Yellow and green

10. The deviation of a ray through a prism occurs because the light is:

A. Refracted at the prism surfaces B. Absorbed completely C. Reflected only from the base D. Unaffected by the prism

Correct answers are locked.

Test 5 — Experimental Concepts & Ray Optics

10 questions • 1 mark each

1. Why is a distant, well-lit object preferred in a focal-length experiment?

A. It produces rays that are approximately parallel B. It produces only reflected light C. It prevents image formation D. It makes the lens opaque

2. Which setup is most suitable for tracing a ray through a rectangular glass slab?

A. A setup with a suitable oblique angle of incidence and clearly placed pins B. A setup where the ray falls exactly normally C. A setup with no screen or pins D. A setup where the slab is hidden from view

3. In the glass slab experiment, why are pins used?

A. To trace the path of the incident and emergent rays B. To measure focal length directly C. To produce sunlight D. To change the refractive index

4. For better visibility of lateral displacement in a glass slab experiment, a larger suitable angle of incidence can be useful because it:

A. Can increase the observable lateral displacement B. Eliminates refraction C. Makes the slab opaque D. Makes the incident ray disappear

5. Which statement best describes Snell's law as used for refraction through a glass slab?

A. It relates the angles of incidence and refraction through the refractive index B. It states that all rays are reflected C. It gives the focal length of a mirror D. It states that light cannot change direction

6. Which device forms a real image of a distant object that can be obtained on a screen?

A. Concave mirror B. Convex mirror C. Plane mirror only D. Opaque object

7. Which device converges parallel rays and can form a real image on a screen?

A. Convex lens B. Concave lens C. Plane mirror D. Convex mirror

8. What is the main purpose of adjusting the lens or mirror position in a focal-length experiment?

A. To obtain a sharp image on the screen B. To increase the size of the apparatus C. To block the incident light D. To make the screen transparent

9. If a ray passes through a convex lens's optical centre, it is generally considered to emerge:

A. Without appreciable deviation B. Towards the principal focus C. Away from the principal focus D. Back towards the object

10. Which observation supports correct refraction through a rectangular glass slab?

A. The angle of emergence is nearly equal to the angle of incidence B. The angle of emergence is always zero C. The angle of refraction is always greater than incidence in glass D. The incident ray and emergent ray are perpendicular

Correct answers are locked.