Holiday HW Phy PDF

FIITJEE BAHRAIN CENTRE PHYSICS -SUMMER HOLIDAY HOMEWORK CRP-GRADE X -----------------------------------------------------------------------------------------------------------------...

FIITJEE BAHRAIN CENTRE PHYSICS -SUMMER HOLIDAY HOMEWORK CRP-GRADE X ----------------------------------------------------------------------------------------------------------------- CHAPTERS-LIGHT – REFLECTION & REFRACTION, HUMAN EYE & COLOURFUL WORLD 1. For a concave mirror of focal length 20 cm, if the object is at a distance of 30 cm from the pole, then the nature of the image and magnification will be: (A) real and -2 (B) virtual and -2 (C) real and +2 (D) virtual and +2 2. Focal length of plane mirror is. (A) At infinity (B) Zero (C) Negative (D) None of these 3. A man standing in front of a concave spherical mirror of radius of curvature 120 cm sees an image erect of his face four times its natural size. Then the distance of the man from the mirror is (A) 180 cm (B) 300 cm (C) 240 cm (D) 45 cm 4. A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be: (A) Greater than unity (B) Less than unity (C) Equal to unity (D) Zero 5. How far in front of a concave mirror of focal length 10 cm, would you place a 2cm pin in order to obtain an erect image 4 cm in height? (A) 10 cm (B) 25 cm (C) 15 cm (D) 5 cm 6. The diagram shows a concave mirror. Identify the labelled parts. (A) X = centre of curvature, Y = pole, Z = focus (B) X = focus, Y = principal axis, Z = focal length (C) X = radius of curvature, Y = focus, Z = principal axis (D) X = centre of curvature, Y = pole, Z = focal length 7. Which of the following statements is true? (A) A concave lens having 4 dioptre power has a focal length 0.25 m (B) A convex lens having –4 diopter power has a focal length 0.25 m (C) A concave lens having 4 dioptre power has a focal length 0.25 m FIITJEE BAHRAIN CENTRE. PH: 973 – 77153535, Email: [email protected] (D) A concave lens having –4 dioptre power has a focal length 0.25 m 8. A ray of light travelling in a rarer medium meets the surface of a denser medium obliquely. While entering the second medium at the point of incidence, it (A) Goes straight into the second medium (B) Bends towards the normal (C) Bends away from the normal (D) Does not enter at all 9. The path of a ray of light coming from air passing through a rectangular glass slab is traced by students A, B, C and D as shown in figure. Which one of them is correct? A (A) A (B) B (C) C (D) D 10. Which of the following ray diagrams is correct for the ray of light incident on a lens shown in fig. (A) A (B) B (C) C (D) D 11. The power of a convex lens of focal point 15 cm is ________ D. (A) 0.15 (B) 15 (C) 3.33 (D) 1/15 12. A lens of power +3.5D is placed in contact with a lens of power -2.5 D. The combination will behave like (A) A convergent lens of focal length 100 cm (B) A divergent lens of focal length 100 cm (C) A convergent lens of focal length 200 cm (D) A divergent lens of focal length 200 cm 13. A student focused the image of a distant object using a device X on a white screen S as shown in the figure. If the distance of the screen from the device is 30 cm, select the correct statement about the device X. (A) The device X is a concave mirror of focal length 15 cm. (B) The device X is a concave mirror of focal length 30 cm. (C) The device X is a convex mirror of focal length 15 cm. FIITJEE BAHRAIN CENTRE. PH: 973 – 77153535, Email: [email protected] (D) The device X is a convex mirror of focal length 30 cm. 14. While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below: The correct figure is given in (A) I (B) II (C) III (D) IV 15. A student focused the image of a distant object using a device ‘X’ on a white screen ‘S’ as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device. (A) The device X is a convex lens of focal length 20 cm. (B) The device X is a concave mirror of focal length 40 cm. (C) The device X is a convex lens of focal length 40 cm (D) The device X is a convex lens of focal length 20 cm. 16. A convex lens forms a virtual image of an object placed at a distance of 20 cm it. The focal length of the lens must be (A) Greater than 20 cm & less than infinity (B) Greater than 10 cm less than 20 cm (C) Less than 20 cm (D) Infinite 17. When an object is placed in front of a convex lens, the image formed: (A) Is always virtual (B) Is always real (C) May be real or virtual (D) None of these 18. A ray of light travelling in air falls obliquely on the surface of a calm pond. It will (A) Go into the water without deviating from its path (B) Deviate away from the normal (C) Deviate towards the normal (D) Turn back on its original path. FIITJEE BAHRAIN CENTRE. PH: 973 – 77153535, Email: [email protected] 19. While performing the experiment on tracing the path of a ray of light through a glass prism as shown in the given diagram, four students interpreted the result as given below. At the minimum deviation position of the prism, which one of the four interpretations is correct? (A) θ1 = θ3 (B) θ1 = θ2 (C) θ1 = θ4 (D) θ1 > θ3 20. A glass slab is placed over a page on which the word VIBGYOR is printed with each letter in corresponding colour. Then, which of the following is correct? (A) The images of all the letters will be in the same place as that on paper (B) Letter V is raised more (C) Letter R is raised more (D) None of the above 21. Rainbow is caused due to (A) Reflection of sun light air (B) Dispersion of sun light from water drops (C) Refraction of sun light from water drops (D) Diffraction of sun rays from water drops 22. On entering a glass prism, sun rays are (A) Deviated but not dispersed (B) Deviated and dispersed (C) Dispersed but not deviated (D) Neither deviated nor dispersed. 23. An object is placed 40.0 cm in front of a convex mirror. The image appears 15 cm behind the mirror. What is focal length of the mirror? (A) +24 cm (B) +11 cm (C) -11 cm (D) -24 cm 24. An object is situated at a distance of f/2 from a convex lens of focal length f. Distance of image will be (A) +(f/2) (B) +(f/3) (C) +(f/4) (D) –f 25. A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance d between them. If a parallel beam of light falling on A Leaves B as a parallel beam, then the distance d in cm will be: (A) 25 (B) 15 (C) 30 (D) 50 26. A person cannot see distinctly objects kept beyond 2 m. this defect can be corrected by using a lens of power. (A) +0.5 D (B) -0.5 D (C) +0.2 D (D) -0.2 D FIITJEE BAHRAIN CENTRE. PH: 973 – 77153535, Email: [email protected] 27. At noon the sun appears white as: (A) Light is least scattered (B) All the colours of the white light are scattered away (C) Blue colour is scattered the most (D) Red colour is scattered the most 28. Twinkling of stars is due to atmospheric: (A) Dispersion of light by water droplets. (B) Refraction of light by different layers of varying refractive indices. (C) Scattering of light by dust particles. (D) Internal reflection of light by clouds. 29. The clear sky appears blue, because: (A) Blue light gets absorbed in the atmosphere (B) Ultraviolet radiations are absorbed in the atmosphere (C) Violet and blue lights get scattered more than light of all other colours by the atmosphere (D) Light of all other colours is scattered more than the violet and blue colour lights by the atmosphere. 30. The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light: (A) Is scattered the most by smoke or fog (B) Is scattered the least by smoke or fog (C) Is absorbed the most by smoke or fog (D) Moves fastest in air FIITJEE BAHRAIN CENTRE. PH: 973 – 77153535, Email: [email protected]