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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What are the three types of materials based on the absorption of light? |
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Answer» 1. Transparent Material 2. Translucent Material 3. Opaque Material |
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| 52. |
Fill in the blanks :1. Concave mirror is ........... in nature. 2. Convex mirror is ............ in nature. 3. Image obtained on Screen are ........... image. |
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Answer» 1. Concave mirror is Converging in nature. 2. Convex mirror is diverging in nature. 2. Image obtained on Screen are real image. |
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| 53. |
What are the parts of shadow? |
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Answer» 1. Umbra 2. Penumbra |
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| 54. |
Fill in the Blanks.1. The ______ is the darkest part of a shadow. 2. The lighter shade of shadow is the ______ 3. Only ______ objects forms shadows. 4. ______ eclipse occurs, when the moon arrives between the sun and the Earth. 5. ______ cables are able to carry more signals than traditional copper cable telephone lines. |
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Answer» 1. umbra 2. penumbra 3. opaque 4. Solar 5. Fibre optic |
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| 55. |
What is a shadow? What things are necessary for the formation of a shadow? |
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Answer» 1. Shadows are formed because light travels in straight lines. 2. Shadow is always against, opposite side of light source. 3. Shadow is formed by opaque objects that stop high from propagating. 4. Things necessary for the formation of shadow: source of light,opaque object |
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| 56. |
Fill in the blanks : 1. After the rain when the sun is low in the sky the ............ appears in the Sky. 2. ........... splits a beam of sunlight into seven colours. 3. When we blow soap bubbles they appear ........... |
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Answer» 1. After the rain when the sun is low in the sky the rainbow appears in the Sky. 2. A Prism splits a beam of sunlight into seven colours. 3. When we blow soap bubbles they appear colourful. |
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| 57. |
______ surface reflects the light well (a) Water (b) Compact disc (c) Mirror (d) Stone |
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Answer» Correct answer is (c) Mirror |
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| 58. |
What kind of surface reflects light? |
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Answer» Smooth and shiny surface reflects light. |
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| 59. |
Differentiate between a reflection and a shadow |
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Answer»
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| 60. |
What is Newton’s disc? |
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Answer» Newton Disc is a card board disc with seven equal sectors colored red, yellow, orange, green, blue, indigo and violet. When the disc turned quickly, the retina receives the sensation of the spectrum simultaneously and disc appears white. |
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| 61. |
True or False – If false give the correct statement.1. Angle of incidence is greater than the angle of reflection.2. The image formed by a plane mirror is real.3. Diffused reflection gives a sharp image.4. The image formed by a plane mirror is always that far behind the mirror as far the object lies in front of it.5. You can see a rainbow only when your back is towards the sun. |
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Answer» 1. False Correct statement: Angle of incidence is o the angle of reflection. 2. False. Correct statement: The image formed by a plane mirror is virt ual and erect. 3. False. Correct statement: reflection gives a sharp image. 4. True. You can see a rainbow only when your back is towards the sun. 5. True. |
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| 62. |
State the size of the image formed by a plane mirror? |
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Answer» The size of image formed by a plane mirror is same as that of the object infront of the mirror. |
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| 63. |
Why are we able to see the tap water in a glass even though it is colourless? |
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Answer» Top water reflects the light into our eyes. As long as an object reflects light into our eyes, we can see it. |
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| 64. |
Mention the properties of light. |
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Answer» Light has some fundamental properties as mentioned below.
1. Types of material according to permeability. 2. Formation of shadows. 3. Plane mirror and images. 4. Spectrum. |
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| 65. |
Write the items given here in the correct column (Stars, brick walls, plants, mirror, planets, electric light bulb, candle) |
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Answer»
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| 66. |
What is the composition of sunlight? |
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Answer» Sunlight is a mixture of seven colours. |
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| 67. |
What is natural sources of light? Give example. |
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Answer» Sources which emit light naturally are known as natural sources of light. The Sun is the primary and the major source of natural light. |
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| 68. |
Match the following.Natural sources of light Man-made sources of lightThe SunTube lightStars in the night skyLight bulbFirefliesTorchAnglerfishBurning candleHoney mushroomOil lamps |
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| 69. |
Which of the following is a natural source of light? (a) Electric lamp (b) Electric filament (c) Torch light (d) Sunlight |
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Answer» (d) Sunlight |
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| 70. |
The natural source of light is 1. Sun 2. Electric lamp 3. Candle flame 4. Kerosene lamp |
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Answer» The natural source of light is Sun. |
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| 71. |
State whether following statement are True or False.i. We see the candle clearly when we bend the tube.ii. We can see our image clearly in running water.iii. Tracing paper is transparent.iv. The light obtained from an electric torch is more intense than that obtained from a candle.v. 28th February is celebrated as “National Science day” since 1987 in India. |
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Answer» i. False ii. False iii. False iv. True v. True |
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| 72. |
Two students while sitting across a table looked down on to its top surface. They noticed that they could see their own and each other’s image. The table top is likely to be made of:(a) unpolished wood(b) red stone(c) glass sheet(d) wood top covered with cloth |
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Answer» (c) glass sheet |
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| 73. |
The natural source of light is1. candle flame2. electric lamp3. sun4. kerosene lamp |
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Answer» The natural source of light is sun. |
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| 74. |
A fish under water observes a freely falling stone in air . If the refractive index of water is ` 4/3`, what is the apparent acceleration of the stone as observed by the fish? |
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Answer» (i) Let `h_(1) and h_(1)^(1)` be the real and apparent height of the stoneat t = 0 s. Let `h_(2) and h_(2)^(1)` be the real and apparent height of the stone at t = 1 s The real distance travelled ` S = h_(1) - h_(2)` Apparent distance travelled `h_(1)^(1) -h_(2)^(1) = S^(1)` ` mu = h_(1)/h_(1)^(1) ,h_(1)^(1) = h_(1)/mu and h_(2)^(1) = h_(2)/mu ` Use the relation ` s = ut + 1/2 at^(2)` In both the cases, determine the apparent acceleration. (ii) ` 13.1 ms^(-2)` |
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| 75. |
When the reflecting surface is curved outwards the mirror formed will be (a) concave mirror (b) convex mirror (c) plane mirror |
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Answer» (b) convex mirror |
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| 76. |
The base of a rectangular glass slab of thickness 10 cm and refractive index `1.5` is silvered. A coloured spot inside the glass slab at a distance of 8 cm from the base. Determine the position of the image formed by the mirror as observed from the top. |
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Answer» (i) ` mu = (R.d)/(A.d)` Determine the actual position of the ink mark by using the above relation. Determine the actual position of the image formed by the plane mirror. (ii) ` 11. 33` cm |
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| 77. |
A glass slab ABCD is made of two different grades of glass of refractive indices `3/2 and 4/3` of equal thickness, and a ray PQ is incident on the face AB. Trace the ray as it passes through the slab and find the angle of emergence and the angle of deviation, Find the effective refractive index of the slab. |
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Answer» (i) Apparent shift ` = t(1-1/mu)` Find the apparent shift in each glass slab `S_(1) and S_(2)` and the total shift (S) = `S_(1) + S_(2)` But `S = t(1-1/mu_(e))` when `mu_(e)` is the effective refractive index (ii) `mu = 24/17` |
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| 78. |
Assertion and Reason.Assertion: For observing the traffic at a hairpin bend in mountain paths a plane mirror is preferred over convex mirror and concave mirror. Reason : A convex mirror has a much larger field of view than a plane mirror or a concave mirror.Mark the correct choice as :(a) If both assertion and reason are true and reason is the correct explanation. (b) If both assertion and reason are true and reason is not the correct explanation. (c) If assertion is true but reason is false. (d) If assertion is false but reason is true. |
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Answer» (d) If assertion is false but reason is true. |
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| 79. |
Choose the correct option:David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be(i) 3 m (ii) 5 m(iii) 6 m (iv) 8 m |
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Answer» (iii) 6 m |
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| 80. |
Which type of lens forms always a virtual image? |
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Answer» Concave lens forms always a virtual image. |
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| 81. |
The power of a rectangular glass slab is zero . |
| Answer» Correct Answer - 1 | |
| 82. |
Assertion (A): A convex mirror always forms a diminished and virtual image. Reason (R): The laws of reflection are not applicable in the case of shpherical mirrors.A. Both A and R are conrrent and R is the correct explanation of A.B. Both A and R are correct but R is not the correct explanation of A.C. A is correct and R is incorrect.D. Both A and R are incorrect. |
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Answer» Correct Answer - C In the case of a convex mirror the nature of the and image formed is always diminished and it is a virtrual and erect image. So A is correct but R is incorrect because the laws of reflection are applicable in all types of mirrors including spherical mirrors. |
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| 83. |
David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the rrillror, then the distance between David and his image will be (i) 3 m (ii) 5 m (iii) 6 m (iv) 8 m |
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Answer» Correct answer is (iii) 6 m Explanation: As David moves 1 m towards the mirror, the image also moves 1 m towards the mirror. Now the distance between David and mirror is 3m and the distance between mirror and image is 3m. So, the total distance between David and his image will be 6m |
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| 84. |
Virtual image produced by convex mirror is always smaller in size and located between focus and the pole. |
| Answer» Correct Answer - 1 | |
| 85. |
A virtual image larger than the object can be produced by (i) concave lens(ii) concave mirror(iii) convex mirror(iv) plane mirror |
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Answer» (ii) concave mirror |
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| 86. |
Assertion and Reason. Assertion (A) : Virtual object can’t be seen by human eye. Reason (R) : Virtual image is formed by converging rays. Mark the correct choice as (a) Both A and R are true and R is the correct explanation of assertion.(b) Both A and R are true but R is not the correct explanation of assertion.(c) A is true but R is false.(d) A is false but R is true. |
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Answer» (c) A is true but R is false Correct reason: Virtual image is formed by diverging rays. |
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| 87. |
A virtual image larger than the object can be produced by a (i) concave lens (ii) concave mirror (iii) convex mirror (iv) plane mirror |
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Answer» (ii) concave mirror |
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| 88. |
Which type of lens forms always a virtual image? |
| Answer» Concave lens. | |
| 89. |
a convex lens forms a virtual image of an object. What is the position of the object ?A. between the lens and its focus.B. at the focus of the lens.C. between F and 2F.D. at infinity |
| Answer» Correct Answer - A | |
| 90. |
Choose the correct option: A virtual image larger than the object can be produced by a(i) concave lens(ii) concave mirror(iii) convex mirror(iv) plane mirror |
| Answer» (ii) concave mirror | |
| 91. |
The image of an object formed by a plane mirror is: A. virtual B. real C. diminished D. upside-down |
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Answer» A. virtual The image of an object formed by a plane mirror is virtual always suggesting that the light rays do not actually come from the image. |
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| 92. |
Try to start the TV by operating the remote control from behind it. |
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Answer» T.V will not start. |
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| 93. |
The formation of inverted image in a pin hole camera shows that1. light enables us to see2. light travels in a straight line path3. light can pass through the pin hole4. light does not pass through the pin hole |
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Answer» 2. light travels in a straight line path |
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| 94. |
Explain why, too little or too much light, both are bad for eyes. |
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Answer» In the presence of little light the iris has to dilate pupil to facilitate entry of more and more light to view things, which leads to strain on the eyes and causes headaches. In case of too much light, the retina may get injured and damaged thus impairing vision. |
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| 95. |
What kind of lens is there in our eyes? Where does it form the image of an object? |
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Answer» The type of lens in our eyes is convex. It forms images on the retina. |
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| 96. |
Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them? |
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Answer» A large pupil and large cornea allows more light to enter their eyes and they can see objects even in faint light. |
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| 97. |
Which of the following statements is correct regarding rods and cones in the human eye? (a) Cones are sensitive to dim light. (b) Cones are sensitive to bright light. (c) Rods are sensitive to bright light. (d) Rods can sense colour |
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Answer» (b) Cones are sensitive to bright light. |
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| 98. |
What is dispersion ? Explain in detail. |
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Answer» 1. Splitting of white light into its seven constituent colours (wavelength), on passing through a transparent medium is known as dispersion of light. 2.Dispersion occurs because, light of different colours present in whit light have different wavelength and they travel at different speed in a medium. 3. Refraction of a light ray in a medium depends on its speed. |
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| 99. |
Explain the working of a periscope. |
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Answer» Periscope: 1. It is an instrument used for viewing bodies or ships, which are over and around another body or a submarine. 2. It is based on the principle of the law of reflection of light. 3. It consists of a long outer case and inside this case mirrors or prisms are kept at each end, inclined at an angle of 45°. 4. Light coming from the distant body, falls on the mirror at the top end of the periscope and gets reflected vertically downward. 5. This light is reflected again by the second mirror kept at the bottom, so as to travel horizontally and reach the eye of the observer. 6. In some complex periscopes, optic fiber is used instead of mirrors for obtaining a higher resolution. 7. The distance between the mirrors also varies depending on the purpose of using |
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| 100. |
A safety vest helps to keep the workers who are working by the roadside safe. This especially so during the nights. Why? |
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Answer» The reflectors on the safety vest reflect light into the motorists eyes. This help to alert the motorists of the wearer’s presence on the road. |
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