Subject: Science, asked on 3/1/16

Q.1 Fill in the blanks:-

(i) Light always travels in a ____________..(ii) Change in direction of light after striking a polished surface is called ____________.(iii) The phenomenon of left appearing right and right appearing left on reflection from amirror is called _____________.(iv) Real images are always ____________ while virtual images are always __________.(erect/inverted)(v) The reflecting side of a concave mirror curves ____________ while the reflecting sideof a convex mirror curves ______________ (inwards/outwards)(vi) Concave mirrors from ____________ and ____________ images whereas the imageformed by a convex mirror is always ____________ (real/virtual)(vii) ____________ mirrors are used as rear/side view mirrors and ____________ mirrorsare used as reflectors of headlights of vehicles.(viii) A ____________ lens converges rays of light falling on it hence it is also called a____________ lens.(ix) A concave lens always forms a ____________ (real/virtual) image which is____________ (erect/inverted) and ____________ (smaller/bigger) than the object.(x) Formation of shadows suggest that light travels in __________ lines.(xi) A __________ lens is thicker in the middle and tapering at the edges.Q.2 Multiple choice questions (Choose the correct option)(A) A virtual image formed by a plain or a spherical mirror(a) is always inverted (b) is always erect (c) is erect or inverted depending on thedistance of the object from the mirror(B) which of the following images can a convex lens not produce?(a) Real, Magnified (b) Virtual, magnified (c) erect, virtual (d) erect, diminished(C) which of the following is true for a convex mirror?(a) It can only form virtual images (b) It can only form real images (c) It can form realor virtual images depending on the distance of the object from the mirror (d) It canform real or virtual images depending on the size of the object.(D) which of the following can not split light into its seven colours?(a) diamond cut in a special way (b) Prism (c) Convex Lens (d) Water droplets suspendedin the air. (E) Sodium chloride will turn(a) Blue Litmus Red (b) Methyl orange yellow (c) Red Litmus blue (d) None of these1. How does a plane mirror differ from a spherical mirror?2. State the law of reflection.3. How many reflected rays can be for a given incident ray falling on a plane mirror?4. Two plane mirrors are placed 900to each other. An incident ray AB falls on one ofthe mirrors at 450. Draw the path of the reflected ray.5. Write down five English alphabets which do not show lateral inversion on reflectionfrom a plane mirror.6. You are standing at a distance of 1m. from a plane mirror (a) What is the distancebetween you and your image (b) By how much distance does your image move fromyou if you had walked 2m away from the original position.7. Under what conditions should a concave mirror, a plane mirror, a convex mirror formvirtual images?8. (a) What type of mirror is used in the following and why?(1) In a search light (2) as a side view mirror in a car (C) as a shaving mirror (4)vigilance mirror in a big shop.(b) Why is light not visible through a bent pipe?(c) If we want to make fire with the help of a lens using the rays of the Sun, what kind oflens should be used and why?(d) What kind of mirrors do the two surfaces of a spoon act as?HOTS QUESTIONSQ.1 What will be the difference in the size of the image (of the same object) formed by asmall and a large plane mirror?Q.2 Identity three letters of the English alphabet or of your mother tongue whose mirror 3.Q.3 Car rear view mirrors carry a warning message that objects in the rear view mirrorare closer than they appear. Why do you think this is so?Q.4 How many images do you think will be formed if an object is kept between two planemirrors parallel to each other?

Subject: Science, asked 5 days, 15 hours ago

Subject: Science, asked on 17/2/17

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