(c) when the sun is overhead State whether the following statements are True or False. (c)-(iv) Convex lens is a lens which can converge the sun’s rays to a point and burn a hole in the piece of paper. A virtual image Answer: Answer: To download Printable worksheets for class 7 Mathematics and Science; do check myCBSEguide app or website. True/False 6. Answer: Answer: Question 13. So, when the disc is rotated very fast, then all the seven colours mix together due to which the disc appears to be white (see figure). An image formed by a lens is erect. Answer: which is thicker in the middle than at the edges is called a convex lens. Boojho made light from a laser torch to fall on a prism. Will he be able to observe a band of seven colours? This phenomenon is called reflection of light. So, when the person moves 2 m towards the plane mirror, then the distance between the person and the plane mirror will be equal to (6 m – 2 m) = 4 m, this means that distance between the image and the mirror will be 4m. 11. (a) Dispersion of white light is the name of phenomenon which leads to the formation of band of seven colours. Popular Questions for the Light, Karnataka Class 7 SCIENCE, Science. (c) concave lens provided the image is larger than object (b) cannot be formed on the screen, Question 6. This means that the mirrors of Boojho and Paheli are, respectively. (a) A concave lens can be used to produce an enlarged and erect image. (b) only a concave mirror, Question 9. False, an enlarged image is always larger than the object and is always formed by a concave mirror. left seems to right or vice-versa. CBSE and NCERT students can refer to the attached file. A convex lens always produces a real image. (a) which can be formed on the screen. Question 3. Answer: Now, make a small hole at the centre of the disc. (b) Concave lens and convex mirror, Question 3. Such an image could be formed by [NCERT Exemplar] When light travels obliquely from one transparent medium into another it gets bent. Question 20. Explain how this could be possible. Last Sunday Girish’s mother, Priyanka was preparing the dinner in her kitchen for Girish and his father. 7. Is the image formed by a plane mirror is always upright? (a) Convex mirror is a mirror which is used as a rearview mirror. Question 6. NCERT Exemplar Class 7 Science is very important resource for students preparing for VII Board Examination.Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7. Question from very important topics are covered by NCERT Exemplar Class 7. We can identify the mirrors by forming image of an object. Light Class 7 Science Extra Questions Short Answer Type Questions. Question 5. Real image is an image which is formed on a cinema screen. (c) Only convex mirror 8. concave Draw a diagram to show the dispersion of white light by a glass prism. Answer: (a) when the sun is in front of you (c) only a plane mirror (d) only at the time of sunrise A prism splits light into ………………….. colours. e.g. [HOTS] Yes, the image formed by the plane mirror is always upright. Question 5. Question 15. The sides of an object and its image formed by a concave mirror are always interchanged. The colour of light which is deviated the least by prism in the spectrum of white light is (a) 2 m (c) The outer shining surface of a round bottom steel bowl acts as a __________ mirror. Answer: 3. Answer: Answer: (c) plane mirror and convex mirror, Question 2. False, in a convex spherical mirror, reflection of light takes place out the bent out (bulging out) surface. Name the colours include in the composition of sunlight. Now, rotate the disc quickly in day light. (b) Name the type of spherical mirror represented by the shining steel spoon. 7. seven What type of mirror is used as a side mirror in a scooter? 10. Explain with the help of an activity that when seven colours are mixed together, then white colour is formed. Fix the disc loosely on the tip of a refill of a ball pen. Answer: What type of mirror should he use? Question 9. The lights on a lighthouse rotate around the lighthouse so that it is visible from all sides. In the year 1665, Newton discovered by his experiments with glass prisms that white light (like sunlight) consists of a mixture of lights of seven colours. 6. (b) when the sun is behind you Answer: Question 24. The image of candle in the plane mirror is of the same size as the original candle. 2. It helps in the sense of vision. An erect and enlarged image of an object is formed on a screen. Answer: It was observed that when the distance between an object and a lens decreases, the size of the image increases. All the questions are taken from NCERT Books for Class 7 Science only. The distance between an object and a convex lens is changing. In the formation of a rainbow, what acts as tiny prisms? Class 7 Science Chapter 6 MCQ with answers and explanations are given below. (b) concave mirror or convex lens, Question 7. NCERT 7th Class (CBSE) Science: Light – Quiz. Answer: (b) Name the constituent colours of white light. (c) The sides of an object and its image formed by a concave mirror are always interchanged. Answer: Identify the nature of the lens. (b) 1 m 1. Therefore, the rapid rotation of Newton’s colour disc tells us that mixing of seven colours of the spectrum can give us white light. One day, Ramesh’s friend was performing their respective experiments given by their teacher. 11. You are given three mirrors of different types. So, state whether it is real or virtual image. Answer: Changing of left side of an object to right side of image is called ………………….. Is the object moving in a direction towards the lens or away from it? 6. [NCERT Exemplar] In the same way, the bottom of candle remains at the bottom in an image. Question 3: What is incident ray? Question 8. Question 17. (a) The inner surface of a steel spoon acts as a ___________ mirror. Briefly explain why in ambulance words are written laterally inverted. State in brief what we can demonstrate by rotating Newton’s colour disc very fastly. Will he be able to observe a band of seven colours? Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7. In case of convex lens, when we move the object far away from the lens, the size of image decreases and ultimately, when object is at infinity, it will form a point image at focus. Differentiate between a plane mirror, concave mirror and a convex mirror without touching them. (d) 0.25 m Is the object moving in a direction towards the lens or away from it? Answer: Light is a form of energy. By rotating Newton’s colour disc, we can demonstrate that when seven colours are mixed together, then a white colour is formed. So, greater the shining and smoothness of the surface, greater will be the reflection. It is noticed that the size of the image formed on a screen is decreasing. Which of the following would you prefer to use while reading small letters found in a dictionary? True You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. In first case, we will use a concave mirror, as we know that concave mirror can form real image, i.e. What is a _____? Two different type of lenses are placed on a sheet of newspaper. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Question 4. A rainbow can be seen in the sky [NCERT Exemplar] Boojho found his image to be erect and of the same size, whereas Paheli found her image erect and smaller in size. Question 4. Name the type of lens which diverges a beam of parallel rays of light. Questions of level-II Olympiad exams will be from current class … The distance between an object and a convex lens is changing. Question 12. You have a spherical mirror. Answer: It can be either larger or smaller depending on the distance of the object to the mirror. Question 6. Explain. Mention the type of image Firstly, take a circular cardboard disc of about 10 cm diameter, then divide this disc into seven equal segments and paint the seven colours of white light (red, orange, yellow, green, blue, indigo and violet) on these segments (as shown in figure given ). Such an image could be formed by a. If the distance between object and lens is less than the focus of the lens, then it forms a virtual image and this image cannot be obtained on a screen but formed on the same side of the object.