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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.
| 401. |
What is the name of transparent front part of an eye? |
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Answer» Cornea is the transparent front part of an eye. It covers the front portion of the eye. |
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| 402. |
Mention the name of the most popular resource for visually challenged persons which can make them read and write. |
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Answer» Best way to learn and write Braille system is - The Hadley Institute for the Blind and Visually Impaired. |
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| 403. |
The direction of light can be changed by ______A. a plane mirrorB. a piece of paperC. a stoneD. All the above. |
| Answer» Correct Answer - D | |
| 404. |
Name some auditory aids which are useful for visually changed persons. |
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Answer» Braille (Braille is named after its creator- Louis Braille). |
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| 405. |
Name the part of our eye that gives it as distinctive colour. |
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Answer» Our eye contains two types of cells – cone cell and rod cell.
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| 406. |
Name the part of the eye which gives colour to the eyes. |
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Answer» The part of the eye which gives colour to the eyes Iris. |
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| 407. |
In our eye ........... cells can sense colour. a) Rod b) Cone c) Both rod andcone d) Neither rod nor cone |
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Answer» In our eye, Cone cells can sense colour. |
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| 408. |
To make a kaleidoscope we require a) Three plane mirrors b) Four plane mirrors c) Three glass sheets d) Four glass sheets |
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Answer» a) Three plane mirrors |
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| 409. |
Which of the following is not a luminous object? a) sun b) candle c) moon d) Tube light |
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Answer» Moon is not a luminous object. |
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| 410. |
If light falls perpendicularly on a plane mirror, what will be the angle in which it will be reflected? a) 45 degrees b) 90 degrees c) 180 degrees d) 360 degrees |
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Answer» b) 90 degrees |
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| 411. |
What holds the crystalline lens in the human eye? |
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Answer» Ciliary muscles. |
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| 412. |
Match the following columns.Column A Column B(a) wooden block(i) New moon's day(b) Sun(ii) Rectilinear propagation of light(c) Umbra(iii) opaque body(d) Eclipse(iv) Iuminous body(e) solar eclipse(v) complete dark part |
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| 413. |
Fill in the blanks(a) Light gives us the sensation of .............(b) The sun is a.............. source of light.(c) A medium through which light cannot pass is called the ...............(d) A medium which allows light to pass through it easily is called the ...............(e) Moon is a ............... body.(f) Light travels in a ............... path.(g) In a pin hole camera, the image formed is ...............(h) The darkest portion of a shadow is called the.............(i) The less dark portion of a shadow is called the ...............(j) Lunar eclipse occurs when the ............. comes in between the............... and the sun. |
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Answer» (a) Light gives us the sensation of vision. (b) The sun is a natural source of light. (c) A medium through which light cannot pass is called the opaque medium. (d) A medium which allows light to pass through it easily is called the transparent medium. (e) Moon is a non-luminous body. (f) Light travels in a straight line path. (g) In a pin hole camera, the image formed is inverted and real. (h) The darkest portion of a shadow is called the umbra. (i) The less dark portion of a shadow is called the penumbra. (j) Lunar eclipse occurs when the earth comes in between the moon and the sun. |
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| 414. |
What is the name of a small opening in the iris of an eye? |
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Answer» A small opening in the iris of an eye is known as pupil. Pupil controls the amount of light that enters the eye. |
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| 415. |
A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain. |
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Answer» Some of the reason can be |
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| 416. |
A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain. |
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Answer» We can see the shadow of football lying on the ground because the ground acts as a screen for it. However, when the football is kicked high, the ground, which is acting as a screen is away from the football, hence no shadow of the football will be formed on the ground. |
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| 417. |
Have you ever seen your image in rearview mirror of your father’s, motor cycle? |
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Answer» The correct answer is Yes . |
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| 418. |
Take an empty tooth paste box and two mirror strips of required size and make a periscope. |
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Answer» Collect the following materials to make your own periscope. 1. Empty tooth paste box, two mirror strips, scale, pencil, blade, gum. 2. Take an empty tooth paste box. 3. Close the ends and draw two squares at both the ends by using scale and pencil. 4. Draw diagonals to the square boxes, such that the two diagonals facing each other. 5. Make two slits with the help of blade along the diagonals. 6. Make sure that the size of mirror should be equal to the length of slits. 7. Fix the mirror strips in the slits in such a way that reflecting surfaces of mirror strips face pach other. 8. Fix the mirror strips firmly to the box by using gum. 9. Cut out two windows on the narrow sides such that the windows should open directly on the reflecting surfaces of the mirror strips. Now the Periscope is ready. |
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| 419. |
Man A has a defect of vision due to which he cannot see the nearby objects clearly (though he can see the distant objects clearly). On the other hand, man B has a defect of vision due to which he cannot see the distant object clearly (though he can see the nearby objects clearly). The defect in man A can be corrected by using spectacles containing lenses C whereas the defect in man B can be corrected by using spectacles containing lenses D.(a) Name the defect of vision in man (i) A, and (ii) B. (b) What type of lenses are (i) C, and (ii) D? |
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Answer» a) i-Man A suffers from hypermetropia wherein the image of a nearby object is formed behind the retina so the person has a blurred vision while looking at nearby objects. ii- Man B suffers from myopia wherein Light from a distant object forms an image before it reaches the retina so the person can see the nearby objects clearly but not the distant objects. b) C are Convex lens. these lenses are placed in front of a hyper-metropic eye which moves the image forward and focuses directly onto the retina which clears the vision of a nearby object. D are concave lenses. These lenses are placed in front of a myopic eye which moves the image back to the retina and clarifies the image of a distant object. |
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| 420. |
`{:("Column A","Column B"),(A."Real image",(" ")a."Concave mirror"),(B."Virtual image",(" ")b."Convex mirror"),(C."Inner surface of a spoon",(" ")c."Erect"),(D."Outer surface of a spoon",(" ")d."Inverted"):}` |
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Answer» Correct Answer - A::B::C::D A-d All the real images are inverted. B-c All the virtual images are erect. Convex mirrors also forms virtual images. C-a Inner surface of a spoon behaves as a concave mirror. Outer surface of a spoon behaves as a convex mirror. |
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| 421. |
Angle between two plane mirrors in periscope is A) 0° B) 90° C) 180° D) 360° |
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Answer» The correct option is A) 0°. |
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| 422. |
Why is the writing on the front of an ambulance back to front as shown in the picture |
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Answer» 1. This is due to lateral inversion. 2. The phenomenon due to which the left side of an object appears to be right side of the object in its image in a reflecting medium (mirror). 3. So that drivers see the word the right way around in their rear-view mirror. |
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| 423. |
Describe the picture |
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Answer» 1. When the tube is bent, we cannot see the source of light 2. When the tube is held straight we can see the flame. The two pictures verify that light travels in straight lines. This is known as rectilinear propagation of light. |
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| 424. |
Observe the picture given in Fig. 11.6. A sheet of some material is placed at position ‘P’, still the patch of light is obtained on the screen. What is the type of material of this sheet? |
| Answer» A sheet of transparent material is placed at ‘P’. | |
| 425. |
What do you observe in the picture? Mention the different objects in the scenery. |
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Answer» Trees, river, hills, rainbow, steps, boat, a boy, a girl, butterfly, water, plants, wooden bridge. |
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| 426. |
Which of the following is not a characteristic of the image of the plane mirror? A) Object distance is equal to image distance. B) Size of the object is equal to size of the image. C) The image formed is always real and erect. D) Laterally inverted image is formed. |
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Answer» The correct option is C) The image formed is always real and erect.. |
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| 427. |
Define reflection of light ? |
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Answer» When light rays after striking the smooth and shiny surface return to same medium, this phenomenon is called reflection of light. |
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| 428. |
What is an incandescent body ? Give example. |
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Answer» The bodies which emit light when heated to a very high temperature are called incandescent bodies. Ex : Electric bulb. |
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| 429. |
What is a beam of light? How many types of beam of lights are there? |
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Answer» The bundle of light rays are called beam of light rays. These are three types. 1. Parallel beam of light rays 2. Converging beam of light rays 3. Diverging beam of light rays. |
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| 430. |
How white light is composed? |
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Answer» White light is composed of seven colours. |
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| 431. |
Angle between normal and the incident ray A) angle of incidence B) angle of reflection C) angle of vision D) A & B |
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Answer» The correct option is A) angle of incidence. |
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| 432. |
What are the essential conditions for the formation of shadow ? |
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Answer» 1. There should be an opaque material 2. There should be a source of light and screen. 3. The object must be placed in the path of light. Then shadow is formed on the screen. |
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| 433. |
What is shadow ? |
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Answer» Shadow is the dark space behind an opaque object where light does not reach. |
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| 434. |
Why do dentists use a concave mirror? |
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Answer» Dentists also use concave mirrors to get a bigger image of the teeth. |
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| 435. |
What is speed of light in vacuum? |
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Answer» The speed of light in vacuum is known to be almost exactly 300,000 km per second. In 1665 the Danish astronomer Ole Roemer first estimated the speed of light by observing one of the twelve moons of the planet Jupiter. |
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| 436. |
What is reflection of light? |
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Answer» The rays of light falling on an object from a source of light are thrown back from the substance of that object. This is reflection of light. |
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| 437. |
Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way ? |
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Answer» A cylindrical shape can give a circular shadow when light is incident from its top or bottom. It will give a rectangular shadow when light is incidental from its side. |
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| 438. |
Concave mirrors are used by dentists to examine teeth. Why? |
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Answer» As a dentist’s head mirror: You would have seen a circular mirror attached to a band tied to the forehead of the dentist/ENT specialist. A parallel beam of light is made to fall on the concave mirror; this mirror focuses the light beam on a small area of the body (such as teeth, throat etc.). |
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| 439. |
Pick out the concave and convex mirrors from the following and tabulate them Rear-view mirror, Dentist’s mirror, Torch-light mirror, Mirrors in shopping malls, Make-up mirror. |
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| 440. |
Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way? |
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Answer» A cylinder object can cast shadows in two ways. When the top circular view faces the shining object, a circular shape shadow is formed. When its curved side faces the shining object, it casts a rectangular shadow. |
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| 441. |
Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon. |
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Answer» Opaque : A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, kerosene stove, sun, firefly, moon. |
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| 442. |
A LASER source placed between two concave mirrors sends light rays as shown in the figure. If PQ and RS are parallel to the principal axis, determine the focal lengths and radius of curvatures of both the mirrors. |
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Answer» As the light ray after reflection from the first mirror travels parallel to the principal axis, it is placed at the principal focus of first mirror. The reflected ray from the second mirror travel through the focus of the first mirror. Therefore, the source is also placed at the focus of second mirror. So, focal length f= 10 cm and radius of curvature R `=2xxf=2xx10=20cm` |
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| 443. |
How do we see objects around us? |
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Answer» The rays of light falling on an object from a source of light are thrown back from the surface of that object. This is called reflection of light. We see the object when the reflected rays reach our eyes. |
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| 444. |
What helps us to see the objects around us? |
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Answer» Reflected light helps us to see objects around us. |
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| 445. |
Fill in the blanks1. Light is a form of ………………. that helps us to see all the things around us. 2. Light comes from different objects called ………………. . 3. Objects that emit light are known as ………………. . 4. Sources that release light artificially [with human involvement] are called ………………. sources of light or artificial sources of light. 5. ………………. source emit light on their own. 6. The direction or path along which light travels is called ………………. . 7. The straight line indicates the of light and arrow mark indicates the ………………. of light from the source. 8. A bundle of light rays are called ………………. of light rays. 9. Light rays which travel parallel to each other are called ………………. of light rays. 10. Light rays which travel from different directions to meet at a point are called as ………………. of light rays.11. Light rays which travel from a source moving in different directions are called as ………………. of light rays. 12. The process of bouncing back of light rays into the same medium after falling on a smooth or rotigh surface from the light source is called ………………. . 13. Objects are visible only when ………………. falls on the objects and bounces back to the eye. 14. Light rays from the sun fall on the mirror and bounced back and formed a spot of light on the wall. It is the image of ………………. . 15. The light rays that fall on the objects are called ………………. . 16. The light rays that bounce back from the objects are called ………………. . 17. Reflection from a ………………. surface is called regular reflection. 18. Reflection from an irregular or uneven surface is called ………………. reflection. 19. Clear images are formed in case of ………………. reflection. 20. Angle of ………………. is equal to Angle of reflection. |
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Answer» 1. energy 2. sources of light 3. sources of light 4. man made 5. natural 6. a ray of light 7. path, direction 8. beam 9. parallel beam 10. Converging beam 11. Diverging beam 12. reflection of light 13. Light 14. sun 15. incident rays 16. reflected rays 17. smooth and shiny 18. irregular or diffused 19. regular 20. incidence |
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| 446. |
Write the uses of convex mirrors. |
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Answer» 1. Large convex mirrors kept at the corners of curved roads to avoid accidents. 2. Convex mirrors form images of vehicles on both sides of curved road. 3. These mirrors are also used at the junctions of roads. 4. These mirrors used as rear view mirrors in vehicles. |
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| 447. |
Which colour of light is better to see? Why? |
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Answer» 1. Yellow light is better to see. 2. Yellow light has been proven effective in protecting retina than blue light which causes damage to retina. |
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| 448. |
What is the rule of 20 – 20 – 20? |
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Answer» While watching TV or computer a simple rule 20 – 20 – 20 helps us in protecting eyesight. After 20 minutes of watching TV or computer screen, take 20 seconds break and watch the TV or computer around 20 feet away. |
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| 449. |
Akshaya got many doubts while her brother is burning a paper with a magnifier. What would be those doubts? |
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Answer» 1. How does a magnifier burn the paper? 2. Why are the sun rays passing through the magnifier, without reflecting back? 3. What is the shape of the magnifier? 4. What happens to the sun rays after passing through the magnifier? |
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| 450. |
How objects are visible? |
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Answer» Objects are visible only when light falls on the objects and bounces back to the eye. |
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