NCERT Solutions for Class 6th Science Chapter 13 : All Q&A

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As iron nails and screws are magnetic materials and will get attracted to the magnet,whereas wooden shavings are non-magnetic. Music can become noise when played at high volumes.

The direction of deflection of N-pole of the compass needle gives the direction of the magnetic field at that point. As a result, a pleasant sound is produced. Ans: i Magnet has two poles—south pole and north pole. The height of the wall is 4m and thickness of the wall is 24 cm.

Downlaod NCERT Solutions for Class 7 Science (Updated for 2018

Answer 1 a Ncert solutions for class 7 science chapter 13 image that cannot be obtained on a screen is called virtual image. F b A concave lens always form a virtual image. T c We can obtain a real, enlarged and inverted image by a concave mirror. T d A real image cannot be obtained on a screen. F e A concave mirror always form a real image. Question 4 State the characteristics of the image formed by a plane mirror. Answer 4 Characteristics of the image formed by a plane mirror: Virtual and erect. Size of image is equal to size of object. Laterally inverted image image of left side visible on right side. Distance of image behind the mirror is equal to distance of object in front of mirror. Question 5 Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Answer 5 A, H, I, M, O, T, U, V, W and X are the letters which form same image as the letter is. These letters are laterally symmetrical. Question 6 What is a virtual image. Give one situation where a virtual image is formed. Answer 6 The image, which cannot be obtained on a screen, is called virtual image. The images formed by plane mirror, convex mirror and concave lens are virtual. Question 7 State two differences between a convex and a concave lens. Answer 7 A convex lens can make images which are enlarged or smaller or equal to the size of the object whereas concave lens can always make smaller image. A convex lens makes both real image and virtual images whereas a concave lens always makes a virtual image. Question 8 Give one use each of a concave and a convex mirror. Answer 8 Concave mirror is used by dentist, solar furnace, reflector of a torch, etc. Convex mirror is used in rear view mirrors. Question 9 Which type of mirror can form a real image. Question 10 Which type of lens forms always a virtual image. Question 11 Choose the correct option: A virtual image larger than the object can be produced by a i concave lens ii concave mirror iii convex mirror iv plane mirror Answer 11 ii concave mirror Question 12 Choose the correct option: David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be i 3 m ii 5 m iii 6 m iv 8 m Answer 12 iii 6 m Explanation: As David moves 1 m towards the mirror, the image also moves 1 m towards the mirror. Now the distance between David and mirror is 3 m and the distance between mirror and image is 3 m. So, the total distance between David and his image will be 6 m. Question 13 Choose the correct option The rear view mirror of a car is a plane mirror. The driver sees in his rear view mirror the image of a truck parked behind his car.

The spores are stored in a hard outer covering and this is called sporangium. Download options are given at the end of these solutions. When loud music is played during religious celebrations or marriages, it can be annoying for many people. It is responsible for production of sound. Answer Time Period given by the inverse of the frequency. For other answers please visit to or or or or or or or or go for Solutions. Therefore, it has a motion along a straight line. Our for Class 7 Science are by our subject matter experts. For other answers please visit to or or or or or or or or go for Solutions. Calculate the speed of the train. Ans: i False ii True iii True iv False v True vi True vii False 3.