OBJECTIVE QUESTIONS FOR NEET AIIMS JIPMER www wisedane
OBJECTIVE QUESTIONS FOR NEET AIIMS JIPMER www. wisedane. com
PHYSICS RAY OPTICS SET 1 MCQ’S www. wisedane. com
Q 1. Two mirrors are kept at 600 to each other and a body is placed in the middle. The total number of images formed is : A. Six B. Five C. Four D. Three www. wisedane. com
ANSWER (B) EXPLANATION www. wisedane. com
A. 300 B. 600 C. 900 D. 450 www. wisedane. com
ANSWER (C ) EXPLANATION Ø Mirrors are to be placed at right angle to each other. www. wisedane. com
Q 3. Two plane mirrors are at right angles to each other. A man stand between them and combs his hair with his right hand. How many of the images will be seen when using his right hand ? A. 1 B. 2 C. 3 D. None of these www. wisedane. com
ANSWER (A) EXPLANATION www. wisedane. com
Q 4. The image of an object formed by a device is always virtual and small. The device may be: A. A glass plate B. Concave lens C. Convex lens D. Concave mirror www. wisedane. com
ANSWER (B) EXPLANATION Ø Concave lens (see the property of image formed by different lenses). www. wisedane. com
Q 5. A small object is 10 cm in front of a place mirror. If you stand 30 cm behind the object and look at his image, at what distance must you focus your eyes A. 50 cm B. 40 cm C. 30 cm D. 10 cm www. wisedane. com
ANSWER (A) EXPLANATION Ø Image formed by the plane mirror is behind the mirror at the same distance as much the object is in front of the mirror. So the man should focus his eyes at the distance 30 + 10 = 50 cm. www. wisedane. com
Q 6. How many images will be formed if two mirrors are fitted on adjacent walls and one mirror on the ceiling ? A. 5 B. 7 C. 11 D. 2 www. wisedane. com
ANSWER (B) EXPLANATION Ø Images will be formed, three due to the two adjacent walls at 900 and four images on the ceiling. www. wisedane. com
Q 7. A converging lens has a focal length in air = 20 cm. when it is immersed in a liquid of refractive index less than the refractive index of the material of the lens, the focal length of lens in the liquid: A. = 20 cm B. > 20 cm C. < 20 cm D. Changes the sign www. wisedane. com
ANSWER (B) EXPLANATION www. wisedane. com
Q 8. The lens shown in the figure is made of two different materials. A point object is placed on the axis. How many images will the object form. A. One B. Two C. Three D. No image www. wisedane. com
ANSWER (B) EXPLANATION Ø Two Images will be formed because two different materials in a lens from two different images. www. wisedane. com
A. 450 B. 370 C. 600 D. 300 www. wisedane. com
ANSWER (C) EXPLANATION Ø Equilateral prism means A = 600 www. wisedane. com
Q 10. A convergent beam is incident on a convex lens L as shown in the figure. The image formed is : A. Real, erect and enlarged B. Real, erect and diminished C. Virtual, erect and diminished D. Virtual, erect and enlarged www. wisedane. com
ANSWER (B) EXPLANATION Ø Real, erect and diminished www. wisedane. com
Q 11. A 9 cm high image of an object is formed on a screen by a convex lens. When the lens is displaced towards the screen, again a 4 cm high image is formed on the screen. The height of the object is : A. 6 cm B. 6. 25 cm C. 6. 5 cm D. None of these www. wisedane. com
ANSWER (A) EXPLANATION www. wisedane. com
Q 12. Radius of curvature of concave mirror is 40 cm and size of the image is twice as that of the object. The object distance is : A. 20 cm B. 30 cm C. 60 cm D. 40 cm www. wisedane. com
ANSWER (B) EXPLANATION www. wisedane. com
Q 13. A thin lens, made of glass of refractive index 1. 5, has a front surface + 11 D power and back surface – 6 D. If this lens is submerged in a liquid of refractive index 1. 6, the resulting power of the lens is : A. -1 dioptre B. + 1 dioptre C. – 5 dioptre D. +5 dioptre www. wisedane. com
ANSWER (C) EXPLANATION Ø Combination is behaves as a convex lens of power 5 D. When in a medium of refractive index 1. 6, the combination will behave as a concave lens of power – 5 D. www. wisedane. com
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ANSWER (B) EXPLANATION www. wisedane. com
Q 15. If a diverging lens is to be used to form an image which is one fourth of the size of the object, where must the object be placed: A. f B. 2 f C. 3 f D. 4 f www. wisedane. com
ANSWER (C) EXPLANATION www. wisedane. com
Q 16. As an object gets closer to the focal point of a converging lens from infinity, its image: A. Becomes smaller B. Remains the same size C. Gets farther from the lens D. Gets closer to the lens www. wisedane. com
ANSWER (C) EXPLANATION Ø As the object moves towards the converging lens, its image moves away from the lens. Moreover, when the object reaches the focus of the lens, then image goes to infinity. www. wisedane. com
Q 17. In order to increase the magnifying power of microscope, the focal power of the : A. Objective and the eye-piece should be small B. Objective should have small focal length and the eye- piece should have large focal length C. Both should have large focal lengths D. The objective should have large focal length and eye-piece should have small focal length www. wisedane. com
ANSWER (A) EXPLANATION www. wisedane. com
Q 18. A beam of light is partially reflected and partially refracted from a surface. The angle between the reflected and the refracted light is 900. The angle of refraction is 300. Then the angle of incidence must be : A. 780 B. 500 C. 600 D. 750 www. wisedane. com
ANSWER (C) EXPLANATION www. wisedane. com
Q 19. Critical angle for total internal reflection will be smallest for light travelling from : A. Water to glass B. Glass to air C. Glass to water D. Water to air www. wisedane. com
ANSWER (B) EXPLANATION www. wisedane. com
Q 20. A convex lens of focal length 2 m has an object placed at a distance of 0. 5 m from it. The image formed is : A. Real, at a distance of 2/3 m from the lens B. Virtual, at a distance of 2/3 m from the lens C. Real, at a distance of 0. 04 m from the lens D. Virtual, at a distance of 0. 04 m from the lens www. wisedane. com
ANSWER (B) EXPLANATION www. wisedane. com
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