Welcome to your Light MCQs Mock Test of 10th Class Science

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1. The real image formed by a concave mirror is smaller than the object if the object is

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2. The image formed by a concave mirror is real, inverted and highly diminished (much smaller than the object). The object must be

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3. In the concave reflector of a torch, the bulb is placed

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4. The focal length of a small concave mirror is 2.5 cm. In order to use this concave mirror as a dentist's mirror, the distance of tooth from the mirror should be

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5. One of the following does not apply to a concave mirror. This is because

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6. In order to obtain a magnification of, -0.6 (minus 0.6) with a conc (ave mirror, the object must be placed

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7. An object is placed at a large distance in front of a concave mirror of radius of curvature 40 cm. The image will be formed in front of the mirror at a distance of

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8. Linear magnification (m) produced by a rear view mirror fitted in vehicles

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9. Linear magnification produced by a concave mirror may be

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10. Magnification produced by a convex mirror is always

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11. Magnification produced by a plane mirror is

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12. In order to obtain a magnification of, - 2 (minus 2) with a concave mirror, the object should be placed

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13. The image formed by a spherical mirror is virtual. The mirror will be

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14. Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be

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15. If the image formed is alway virtual, the mirror can be

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16. A concave mirror cannot be used as

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17. A boy is standing in front of and close to a special mirror. He finds the image of his head bigger than normal, the middle part of his body of the same size and his legs smaller than normal. the special mirror is made up of three types of mirrors in the following order from top downwards

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18. A real image of an object is to be obtained. The mirror required for this purpose is

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19. Consider two statements (i) and (ii) given below: (i): real image is always inverted (ii) : virtual image is always erect Out of these two statements

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20. The refractive indices of four media A, B, C and D are 1:44, 1.52, 1.65 and 1.36 respectively. When light travelling in air is incident in these media at equal angles, the angle of refraction will be the minimum

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21. The refractive indexes of four substances P, Q, R and S are 1.77, 1.50, 2.42 and 1.31 respectively. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in

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22. The refractive index of water is

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23. The refractive index of water with respect to air is 4/3. The refractive index of air with respect to water will be

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24. The refractive index of glass with respect to air is 3/2 and the refractive index of water with respect to air is 4/3. The refractive index of glass with respect to water will be

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25. A converging lens is used to produce an image of an object on a screen. What change is needed for the image to be formed nearer to the lens?

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26. A convex lens of focal length 8 cm forms a real image of the same size as the object. The distance between object and its image will be

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27. A virtual, erect and magnified image of an object is to be obtained with a convex lens. For this purpose, the object should be placed

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28. A burning candle whose flame is 1.5 cm tall is placed at a certain distance in front of a convex lens. An image of candle flame is received on a white screen kept behind the lens. The image of flame also measures 1.5 cm. If f is the focal length of convex lens, the candle is placed

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29. A convex lens has a focal length of 10 cm. at which of the following position should an object be placed so that this convex lens may act as a magnifying glass?

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30. A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces

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31. An illuminated object is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is

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32. An object is placed between f and 2f of a convex lens. Which of the following statements correctly describe its image?

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33. Which of the following can make a parallel beam of light when light from a bulb falls on its?

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34. In order to obtain a real image twice the size of the object with a convex lens of focal length 15 cm, the object distance should be

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35. Linear magnification produced by a convex lens can be

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36. Magnification produced by a concave lens is always

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37. In order to obtain a magnification of, - 3 (minus 3) with a convex lens, the object should be placed

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38. A convex lens produces a magnification of +5. The object is placed

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39. Ifa magnification of, -1 (minus 1) is obtained by using a converging lens, then the object has to be placed

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40. To obtain a magnification of, -0.5 with a convex lens, the object should be placed

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41. An object is 0.09 m from a magnifying lens and the image is formed 36 cm from the lens. The magnification produced is

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42. To obtain a magnification of, - 2 with a convex lens of focal length 10 cm, the object should be placed

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43. A convex lens of focal length 15 cm produces a magnification of = 4. The object is placed

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44. If a magnification of, -1 is to be obtained by using a converging lens of focal length 12 cm, then the object must be placed

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45. In order to obtain a magnification of, -0.75 with a convex lens of focal length 8 cm, the object should be placed

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46. A diverging lens is used in

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47. When an object is kept at any distance in front of a concave lens, the image formed is always

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48. When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at the focus of