Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Light and Opaque Objects, Quizzes of Environmental science

Environmental science

The properties of different types of objects in relation to light. It explains the concept of opaque, translucent, and transparent objects, and how they interact with light. The document also covers topics such as the formation of shadows, the characteristics of images formed by mirrors, and the properties of light. It provides information on the behavior of light when it encounters various materials and the factors that affect the appearance of shadows. The document could be useful for students studying topics related to optics, light, and the properties of materials in physics or related fields.

Typology: Quizzes

2023/2024

Available from 09/19/2024

rajjatt-sabhrwal
rajjatt-sabhrwal 🇮🇳

96 documents

1 / 15

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Q1. Out of these, which one is not a man-made luminous body?
1. Electric bulb.
2. Burning candle.
3. Firefly (Jugnu).
4. Oil lamp.
1 Mark
Ans: 4. Oil lamp.
Explanaon: Firefly (Jugnu) is a natural luminous body.
Q2. Which types of objects do not allow light to pass through them?
1. Translucent.
2. Opaque.
3. Transparent.
4. Penumbra.
1 Mark
Ans: 2. Opaque.
Explanaon: Opaque objects do not allow the light to pass through them while translucent objects allow only a part of light to pass
through them.
Q3. ____________ eclipse occurs when moon comes between sun and earth.
1. Lunar.
2. Solar.
3. Paral lunar.
4. Earth.
5. None of these.
1 Mark
Ans: 2. Solar.
Q4. A glass sheet is given to you. By which of the following methods, it can be converted into an opaque object
without breaking?
1. Combining another same glass sheet with the given glass sheet.
2. Covering glass sheet with thin polyethene bag.
3. Applying black paint on both sides of it.
4. All the above.
5. None of these.
1 Mark
Ans: 3. Applying black paint on both sides of it.
Q5. Name the phenomenon due to which our right ear appears as le ear when we see our face in the mirror.
1. Reflecon.
2. Lateral inversion.
3. Eclipse.
4. Refracon.
5. None of these.
1 Mark
Ans: 2. Lateral inversion.
1 MarkQ6. Which of the following is used as a rear view mirror in vehicles?
1. Concave mirror.
2. Convex mirror.
3. Converging mirror.
4. Plane mirror.
5. None of these.
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff

Partial preview of the text

Download Light and Opaque Objects and more Quizzes Environmental science in PDF only on Docsity!

Q1. Out of these, which one is not a man-made luminous body?

  1. Electric bulb.
  2. Burning candle.
  3. Firefly (Jugnu).
  4. Oil lamp.

1 Mark

Ans: 4. Oil lamp. Explanaon: Firefly (Jugnu) is a natural luminous body.

Q2. Which types of objects do not allow light to pass through them?

  1. Translucent.
  2. Opaque.
  3. Transparent.
  4. Penumbra.

1 Mark

Ans: 2. Opaque. Explanaon: Opaque objects do not allow the light to pass through them while translucent objects allow only a part of light to pass through them.

Q3. ____________ eclipse occurs when moon comes between sun and earth.

  1. Lunar.
  2. Solar.
  3. Paral lunar.
  4. Earth.
  5. None of these.

1 Mark

Ans: 2. Solar.

Q4. A glass sheet is given to you. By which of the following methods, it can be converted into an opaque object without breaking?

  1. Combining another same glass sheet with the given glass sheet.
  2. Covering glass sheet with thin polyethene bag.
  3. Applying black paint on both sides of it.
  4. All the above.
  5. None of these.

1 Mark

Ans: 3. Applying black paint on both sides of it.

Q5. Name the phenomenon due to which our right ear appears as le ear when we see our face in the mirror.

  1. Reflecon.
  2. Lateral inversion.
  3. Eclipse.
  4. Refracon.
  5. None of these.

1 Mark

Ans: 2. Lateral inversion.

Q6. Which of the following is used as a rear view mirror in vehicles? 1 Mark

  1. Concave mirror.
  2. Convex mirror.
  3. Converging mirror.
  4. Plane mirror.
  5. None of these.

Ans: 2. Convex mirror.

Q7. A solid transparent sphere has a small opaque dot at its centre. When observed from outside, the apparent posion of the dot will be:

  1. Closer to the eye than its actual posion.
  2. The same as its actual posion.
  3. Farther away from the eye than its actual posion.
  4. None of these.

1 Mark

Ans: 2. The same as its actual posion. Explanaon: As u = – R;

⇒ u= – R

Q8. Paheli observed the shadow of a tree at 8:00 a.m., 12:00 noon and 3:00 p.m. Which of the following statements is closest to her observaon about the shape and size of the shadow?

  1. The shape of the shadow of the tree changes but the size remains the same.
  2. The size of the shadow of the tree changes but the shape remains the same.
  3. Both the size and shape of the shadow of the tree change.
  4. Neither the shape nor the size of the shadow changes.

1 Mark

Ans: 3. Both the size and shape of the shadow of the tree changes. Explanaon: Both the size and shape of the shadow of the tree will be changed because at 8:00 am and 3:00 pm, the lengths of the shadows of tree will be longer than its actual length and point to the West and the East direcons, respecvely. However, at 12:00 noon, the sun will be high in the sky just above the tree, so the shadow of tree will be short.

Q9. There is no dark shadow formed by the glass when light is shone on it. This is because:

  1. It is not night me yet.
  2. The light is not strong enough.
  3. The glass is a transparent object.
  4. The distance between glass and screen is very large.

1 Mark

Ans: 3. The glass is a transparent object. Explanaon: The shadows are formed when the opaque object cuts off the light from the source. Since glass is transparent, it allows the light to pass through it. So no dark shadow is formed.

Q10. Riya and Priya were sing around a round table. They noced that they could see their own and each other's image onto the table top. Then table top is made of:

  1. Unpolished wood, covered with white cloth.
  2. Polished glass of red colour.
  3. Glass covered with cellophane paper.
  4. Smoked glass covered with green colour cloth.

1 Mark

Ans: 2. Polished glass of red colour. Explanaon: Polished glass of red colour reflects some of the light incident on it so images of the both persons are formed on it.

∴ 1 v − − uR = (−^ 1− Ru )

Q17. We place an object X in between a reflecng surface and a screen Q, on which an image of X is formed. If a clear image of object X is formed on the screen Q, then which of the following properes is true for object X?

  1. Transparent.
  2. Translucent.
  3. Opaque.
  4. All the above.
  5. None of these.

1 Mark

Ans: 3. Opaque.

Q18. Which of the following is/ are not always necessary to observe a shadow?

  1. Sun.
  2. Screen.
  3. Source of light.
  4. Opaque object.

1 Mark

Ans: 1. sun. Explanaon: Sun is not always necessary to observe a shadow because any source of light, an opaque object and a screen are just necessary enough to see a shadow.

Q19. Which of the following images are real?

  1. Image formed on the screen of cinema hall.
  2. Image formed by a pinhole camera.
  3. Image formed by a concave mirror when object is placed at infinity.
  4. All the above.
  5. None of these.

1 Mark

Ans: 4. All the above.

Q20. Study the set- up below.

How will the shadow look like?

1 Mark

Ans: 3.

Q21. The mirror image of TRANSPARENT will be:

2. TRANSPARENT.

4. TNERAPSNART.

1 Mark

Ans: 3.

Q22. An incident ray falling normally on a plane mirror then angle of incidence is:

  1. 0º
  2. 120º
  3. 90º
  4. 60º
  5. None of these.

1 Mark

Ans: 1. 0º

Q23. What is lateral inversion?

  1. Image becomes inverted.
  2. Image bends laterally.
  3. Right of the object appears le of the image.
  4. All of these happen.

1 Mark

Ans: 3. Right of the object appears le of the image. Explanaon: Right side of the object appears as le side in the image formed by a plane mirror.

Q24. In which of the following medium speed of light is maximum?

  1. In air.
  2. In vacuum.
  3. In glass.
  4. In water.
  5. None of these.

1 Mark

Ans: 2. In vacuum.

Q25. Look at the following figure and find out the angle of reflecon.

1 Mark

Q32. Geeta placed three objects made of different materials as shown in the figure. She observed a bright spot of light at (II) but (III) would not get any spot.-Then,

  1. (I) and (II) are made of transparent materials and (III) is made of opaque material.
  2. (I) is made of transparent material, (II) is made of translucent material and (III) is made of opaque material.
  3. (I) is made of transparent material, (II) is made of opaque material and (III) is made of either transparent or opaque or translucent material.
  4. (I) and (II) are made of opaque material and (III) is made of transparent material.

1 Mark

Ans: 3. (I) is made of transparent material, (II) is made of opaque material and (III) is made of either transparent or opaque or translucent material. Explanaon: Transparent material allows light to pass through it and opaque object obstructs it.

Q33. You are standing upright in a room in front of a vercal mirror. In this mirror, you can see from your posion, only the upper two- third part of your body. You wish to see the full image of your body in the mirror. Which combinaon of the following three courses of acon will achieve this?

  1. Move away from the mirror.
  2. Move towards the mirror.
  3. Use a mirror whose height will allow you to see your full image.
  4. I only.
  5. II only.
  6. III only.
  7. Either I or III.

1 Mark

Ans: 3. III only. Explanaon: To see the enre length of your body reflected in the mirror, you should use a mirror whose height will allow you to see your full image.

Q34. Rahul and Ravi are standing on the opposite sides of a closed door, both of them are able to see each other clearly. Which type of substance is used to make this door?

  1. Transparent.
  2. Translucent.
  3. Opaque.
  4. All the above.
  5. None of these.

1 Mark

Ans: 1. Transparent.

Q35. Which is an example of a translucent object?

  1. A thin sheet of paper.
  2. A thin glass slab.
  3. A thin iron sheet.
  4. All of these.

1 Mark

Ans: 1. A thin sheet of paper. Explanaon: A thin sheet of paper is transparent.

Q36. Observe the picture given in Fig. carefully. 1 Mark

A patch of light is obtained at B, when the torch is lighted as shown. Which of the following is kept at posion A to get this patch of light?

  1. A wooden board.
  2. A glass sheet.
  3. A mirror.
  4. A sheet of white paper.

Ans: 3. A mirror. Explanaon: A mirror is kept at posion A to get a patch of light because only a mirror can change the direcon of light that falls on it, i.e. causes reflecon.

Q37. Which of the following is not a source of light?

  1. Star.
  2. Burning candle.
  3. Lantern.
  4. Torch.
  5. None of these.

1 Mark

Ans: 5. None of these.

Q38. Lunar eclipse occurs on ___________ day.

  1. Paral moon.
  2. Full moon.
  3. New moon.
  4. Crescent moon.
  5. None of these.

1 Mark

Ans: 2. Full moon.

Q39. A very narrow beam of light is called:

  1. Ray.
  2. Beam.
  3. Candela.
  4. All the above.
  5. None of these.

1 Mark

Ans: 1. Ray.

Q40. Which one of the following types of energy is required to see any non-luminous object?

  1. Light energy.
  2. Heat energy.
  3. Sound energy.
  4. Wind energy.
  5. None of these.

1 Mark

Ans: 1. Light energy.

Q41. Which of the following is a characterisc of virtual image?

  1. It can be obtained on a screen.
  2. It is always inverted.
  3. It is always formed in front of the mirror.
  4. It is always erect.
  5. None of these.

1 Mark

Ans: 4. It is always erect.

Q42. When an opaque object comes in the path of light it forms

  1. An image with colours.
  2. Shadow.
  3. Black and white image.
  4. Depends on the colour of the light.

1 Mark

Ans: 2. Shadow.

  1. E, Reflecon.
  2. Lateral inversion.
  3. E, Lateral inversion.
  4. Refracon.
  5. None of these.

Ans: 2. Lateral inversion.

Q49. A plane mirror reflects a pencil of light to form a real image. Then the pencil of light incident on the mirror is:

  1. Parallel.
  2. Convergent.
  3. Divergent.
  4. None of these.

1 Mark

Ans: 2. Convergent. Explanaon: A plane mirror can form a real image if the object itself is virtual.

Q50. A girl is 4 m away from the plane mirror. If she moves few steps closer to the mirror, what will happen to the image size in the mirror?

  1. The size of image will decrease.
  2. The size of image will increase.
  3. The size of image will be the same.
  4. Cannot say.

1 Mark

Ans: 3. The size of image will be the same. Explanaon: The image formed in the plane mirror is always of the same size as that of the object.

Q51. A burning candle is placed on a table. We can see the light of candle flame when we see it from:

  1. Bent tube → by keeping only one eye open.
  2. Straight tube → by keeping only one eye open.
  3. Spiral tube → by keeping only one eye open.
  4. U-shape tube.
  5. None of these.

1 Mark

Ans: 2. Straight tube → by keeping only one eye open.

Q52. Which of the following will produce the darkest shadow if the object is placed in front of a source of light?

  1. Glass window.
  2. Buer paper.
  3. Net cloth.
  4. Wooden block.
  5. None of these.

1 Mark

Ans: 4. Wooden block.

Q53. Bouncing back of light from shining surfaces is called

  1. Reflecon.
  2. Refracon.
  3. Bending.
  4. Dispersion.

1 Mark

Ans: 1. Reflecon. Explanaon: When a ray of light falls on a smooth and polished surface, whole of light is returned back in the same medium. It is called reflecon of light.

Q54. Solar eclips can be seen on __________ day.

  1. Full moon.
  2. New moon.
  3. Crescent moon.
  4. Gibbous moon.
  5. None of these.

1 Mark

Ans: 2. New moon.

Q55. Which of the following characteriscs are observed in an image formed by a pinhole camera?

  1. Virtual image.
  2. Real image.
  3. Erect image.
  4. Image of different colour.
  5. None of these.

1 Mark

Ans: 2. Real image.

Q56. Which is a device to image the sun?

  1. Plane mirror.
  2. Pinhole camera.
  3. A straight pipe.
  4. Glass slab.

1 Mark

Ans: 2. Pinhole camera. Explanaon: Sun can be imaged by using a pinhole camera.

Q57. The diagram shows an object O viewed using two mirrors. A person looks into the mirrors as shown. At which posion is the image of O seen?

1. A.

2. B.

3. C.

4. D.

1 Mark

Ans: 4. D.

Q58. Three scks are placed in an open field as shown in figure. Which of the following scks will form the shadow of equal length?

  1. Only scks (I) and (II).
  2. Only scks (II) and (III).
  3. Only scks (I) and (III).
  4. All scks (I), (II) and (III).

1 Mark

Ans: 3. Only scks (I) and (III). Explanaon: The length of the shadow changes according to the posion of the source of light, i.e., the sun with respect to the object.

Q59. Which of the following is not a necessary condion for the formaon of a shadow?

  1. An opaque object.
  2. A screen.
  3. A transparent object.

1 Mark

Ans: 4. Both (b) and (c).

Q65. Which of the following is a cold source of light?

  1. Firefly (Jugnu).
  2. Tube light.
  3. The sun.
  4. Electric bulb.

1 Mark

Ans: 1. Firefly (Jugnu). Explanaon: Firefly (Jugnu) emits short bursts of light.

Q66. Look at the Venn diagram. Which of the following objects described below are most likely to be I, II and III? Choose the correct opon.

  1. (I) Oiled paper (II) Air (III) Cellophane paper.
  2. (I) Glass (II) Frosted glass (III) Wood.
  3. (I) Wax paper (II) Clean water (III) Diamond.
  4. (I) Mirror (II) Diamond (III) Amp.

1 Mark

Ans: 2. (I) Glass (II) Frosted glass (III) Wood.

Q67. Which of the following statements is true?

  1. The image formed by a pinhole camera is inverted because light travels in a straight line.
  2. Light does not change its direcon on reflecon.
  3. As we move the object away from the light source, the shadow of the object becomes smaller.
  4. Reflecon is possible only from polished surface.

1 Mark

Ans: 1. The image formed by a pinhole camera is inverted because light travels in a straight line. Explanaon: Light changes its direcon aer reflecon. As we move the object away from the light source, the shadow becomes larger as the distance between object and the light source increases. Reflecon is possible from rough surface also.

Q68. Which of the following characteriscs of an image does not belong to convex mirror?

  1. Real image.
  2. Virtual image.
  3. Smaller image.
  4. Erect image.
  5. None of these.

1 Mark

Ans: 1. Real image.

Q69. Which of the following is a translucent object?

  1. Cardboard.
  2. Tracing paper.
  3. Clear glass.
  4. Air.
  5. None of these.

1 Mark

Ans: 2. Tracing paper.

Q70. Narrow beam of light before reflecon in known as:

  1. Reflected ray.
  2. Incident ray.
  3. Normal ray.
  4. Reflecon.
  5. None of these.

1 Mark

Ans: 2. Incident ray.

Q71. Light travels in

  1. Straight line.
  2. Curved line.
  3. Zig-zag line.
  4. Randomly.

1 Mark

Ans: 1. Straight line. Explanaon: Light travels in straight line.

Q72. Opaque objects:

  1. Allow light to pass through them.
  2. Allow light to pass through them parally.
  3. Allow light not to pass through them.
  4. Both (b) and (c).
  5. None of these.

1 Mark

Ans: 3. Allow light not to pass through them.

Q73. We can see any object if:

  1. It is a luminous object.
  2. It reflects the light falling on it.
  3. It is placed in a dark room.
  4. Both (a) and (b).
  5. None of these.

1 Mark

Ans: 4. Both (a) and (b).

Q74. Light travels in a:

  1. Circular path.
  2. Reclinear path.
  3. Rotaonal path.
  4. Triangular path.
  5. None of these.

1 Mark

Ans: 2. Reclinear path.

Q75. Which of the following is not translucent:

  1. Fog.
  2. Notebook.
  3. Smoke.
  4. Sheet of polythene.

1 Mark

Ans: 2. Notebook.

Q76. What type of object is sheet of cellophane?

  1. Transparent.
  2. Translucent.
  3. Opaque.

1 Mark

Ans: 1. Transparent.

Q77. Which of the following is not a primary colour of white light?

  1. Red.
  2. Green.
  3. Orange.
  4. Blue.
  5. None of these.

1 Mark

Ans: 3. Orange.

Q78. 1 Mark