Practice Test

Q1) An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be Show Answer

Q2) The angle of incidence for a ray of light having zero reflection angle is Show Answer

Q3) For a real object, which of the following can produce a real image ? Show Answer

Q4) Which of the following mirror is used by a dentist to examine a small cavity ? Show Answer

Q5) An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is Show Answer

Q6) An object at a distance of +15 cm is slowly moved towards the pole of a convex mirror. The image will get Show Answer

Q7) A concave mirror of radius 30 cm is placed in water. It's focal length in air and water differ by Show Answer

Q8) A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of object, the position of object will be at Show Answer

Q9) The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be Show Answer

Q10) The nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is Show Answer

Q11) The nature of image formed by a convex mirror when the object distance from the mirror is less than the distance between pole and focal point (F) of the mirror would be Show Answer

Q12) If a man's face is 25 cm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be Show Answer

Q13) As light travels from a rarer to a denser medium it will have Show Answer

Q14) The angle of incidence i and refraction r are equal in a transparent slab when the value of i is Show Answer

Q15) The refractive index of transparent medium is greater than one because Show Answer

Q16) The refractive index of water is 1.33. The speed of light in water will be Show Answer

Q17) Light from the Sun falling on a convex lens will converge at a point called Show Answer

Q18) Large number of thin stripes of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be Show Answer

Q19) A divergent lens will produce Show Answer

Q20) When object moves closer to convex lens, the image bu it shift Show Answer

Q21) A magnified real image is formed by a convex lens when the object is at Show Answer

Q22) A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of the mirror is Show Answer

Q23) Which of the following statements is / are true ? Show Answer

Q24) Magnification produced by a rear view mirror fitted in vehicles Show Answer

Q25) A full length image of a distance tall building can definitely be seen by using Show Answer

Q26) In torches, search lights and headlights of vehicles the bulb is placed Show Answer

Q27) The laws of reflection hold good for Show Answer

Q28) In which of the following, the image of an object placed an infinity will be highly diminished and point sized ? Show Answer

Q29) Assertion :
Incident light is reflected in only one direction from a smooth surface.
Reason :
Since the angle of incidence and the angle of reflection are same, a beam of parallel rays of light falling on a smooth surface is reflected as a beam of parallel light rays in one direction only. Show Answer

Q30) Assertion :
The word AMBULANCE on the hospital vans is written in the form of its mirror.
Reason :
The image formed in a plane mirror is same size of the object. Show Answer

Q31) Assertion :
Cannot see the distant object clearly.
Reason :
The far point of an eye suffering from myopia is less than infinity. Show Answer

Q32) Assertion:
Pupil is black in colour.
Reason :
Pupil is black in colour as no light is reflected in it. Show Answer

Q33) Assertion :
The rainbow is a man made spectrum of sunlight in the sky.
Reason :
The rainbow is formed in the sky when the sun is shining and it is raining at the same time. Show Answer

Q34) A person standing in front of a mirror finds his image larger than himself. This shows that mirror is convex in nature. Show Answer

Q35) Lateral displacement increases with the thickness of the given slab. Show Answer

Q36) Lateral displacement is directly proportional to thickness of the glass slab. Show Answer

Q37) Nature of image formed by mirror gives an ideal about nature of mirror. Show Answer

Q38) A convex and a concave lens of equal focal length behaves as a regular glass slab receiving light normally. Show Answer

Q39) Concave lens and convex mirror diverge the rays which fall parallel to the principal axis. Show Answer

Q40) The power of a concave lens is positive. Show Answer

Q41) The law of reflection hold true for: Show Answer

Q42) When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is: Show Answer

Q43) Consider the following properties of virtual images:
i)cannot be projected on the screen
ii) are formed by both concave & convex lens
iii)are always erect
iv)are always inverted.
The correct properties are: Show Answer

Q44) A real image is formed by the light rays after reflection or refraction when they:
(i) actually meet or intersect with each other.
(ii) actually converge at a point.
(iii) appear to meet when they are produced in the backward direction.
(iv) appear to diverge from a point.
Which of the above statements are correct? Show Answer

Q45) A student obtained a sharp image of a candle flame placed at the distant end of the laboratory table on a screen using a concave mirror to determine its focal length. The teacher suggested him to focus a distant building about 1 km far from the laboratory, for getting more correct value of the focal length. In order to focus the distant building on the same screen the student should slightly move the: Show Answer

Q46) A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens : Show Answer

Q47) Suppose you have focussed on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. if your teacher suggests you to focus the parallel rays of the sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the : Show Answer

Q48) Rays from sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object ? Show Answer

Q49) What is not a characteristic of a rear view mirror in a car ? Show Answer

Q50) Which of the following statement is incorrect ? Show Answer

Q51) A piece of red cloth when suitably illuminated may look black, but a piece of black cloth will never appear red. This phenomenon occurs because : Show Answer

Q52) Consider four mediums P, Q, R and S whose refractive indices are 2.14, 1.99, 2.98 and 2.16 respectively. Assume that if light travels from one medium to another. The rate of change will be utmost in which medium. Show Answer

Q53) The refractive index (n) of a colourless, volatile, non-polar solvent is 1.24 to the refractive index of a solid ice cube. The unmitigated refractive index of the ice cube is 1.31.Enumerate the unmitigated refractive index of the non-polar solvent. Show Answer

Q54) Which of the following mirror is used by a dentist to examine a small cavity ? Show Answer

Q55) To determine the approximate value of the focal length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always: Show Answer

Q56) Which of the following can make a parallel beam of light from a point source is incident on it? Show Answer

Q57) Magnification produce by a rear-view mirror fitted in vehicles. Show Answer

Q58) Rays from sun converge at a point of 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object? Show Answer

Q59) In torches, search lights and headlights of vehicles,the bulb is placed Show Answer

Q60) When light falls on a smooth polished surface, most of it ? Show Answer

Q61) Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below :
Student A : From mirror to the screen
Student B : From building to the screen
Student C : From building to the mirror
Who measured the focal length correctly ? Show Answer

Q62) A student is performing the experiment of determining the focal length of a given concave mirror by focussing a distant tree on a screen. Which one of the following kinds of images he is likely to obtain on the screen ? Show Answer

Q63) A student has focussed on the screen a distant building using a convex lens. If he has selected a blue coloured building as object, select from the following options the one which gives the correct characteristics of the image formed on the screen. Show Answer

Q64) An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device. Show Answer

Q65) A student determines the focal length of a device 'X' by focusing on image of distant object on a screen placed 20 cm from the device on the same side as the object. The device 'X' is Show Answer

Q66) A student obtains a blurred image if a distant object on a screen using a convex lens. To obtain a distinct image on the screen. He should move the lens Show Answer

Q67) An optical device has been given to a student and he determines it's focal length by focusing the image of the sun on screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device Show Answer

Q68) Select from the following the best experimental set-up for tracing the path of a ray of light through a glass slab : Show Answer

Q69) A teacher sets up the stand carrying a convex lens of focal length 15cm at 42.7cm mark on optical bench.He asks 4 students A,B,C,D to suggest the position of screen on the optical bench so that a distant image of a distant tree is obtained almost immediately on it. The position suggested by the students were as:
(i) 12.7cm (ii) 29.7cm
(iii)57.7cm (iv) 72.7cm
The correct position of the screen was suggested by Show Answer

Q70) When you focus the image of a distant flag, whose shape is given below, on a screen using a convex lens, the shape of the image as it appears on the screen is : Show Answer

Q71) A student determines the focal length of a device 'X' by focusing the image of a distant object on a screen placed 20 cm from the device on the same side as the object.
The device 'X' is : Show Answer

Q72) A teacher sets up the stand carrying a convex lens of focal length 15 cm at 42.7 cm mark on the optical bench. He asks four students A, B, C and D to suggest the position of screen on the optical bench so that a distinct image of a distant tree is obtained almost immediately on it. The positions suggested by the students were as :
(A) 12.7 cm
(B) 29.7 cm
(C) 57.7 cm
(D) 72.2 cm
The correct position of the screen was suggested by Show Answer

Q73) In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray : Show Answer

Q74) Focal length of plane mirror is : Show Answer

Q75) To determine the approximate focal length of the given convex lens by focusing a distant object (say, a sign board), you try to focus the image of the object on a screen. The image you obtain on the screen is always: Show Answer

Q76) Suppose you have focused on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggest you to focus on parallel rays of sun, reaching your laboratory table,on the same screen, what you are expected to do is to move the: Show Answer

Q77) A spherical mirror and a thin spherical lens have each a focal length of -15cm each . The mirror and the lens are likely to be Show Answer

Q78) Which of the following lens would you prefer to use while reading small letters found in dictionary? Show Answer

Q79) Assertion :
The nature of the image formed by a concave mirror is real and inverted.
Reason :
The image formed by a concave mirror depends on the position of the object at infinity. Show Answer

Q80) Assertion :
Convex mirrors are used for rear view on vehicles.
Reason :
The size of the image formed by a convex mirror will be same. Show Answer

Q81) Assertion :
Light bends from its path when it goes from one medium to another medium.
Reason :
Speed of light changes, when it goes from one medium to another medium. Show Answer

Q82) Assertion :
The path of light passing through the colloidal solution becomes not visible.
Reason :
The large particle size does not come its way. Show Answer

Q83) Assertion :
When a ray of light travels from air to water, its speed will increase.
Reason :
The speed of light is slower in a denser medium than in a rarer medium. Show Answer

Q84) Assertion :
A ray of light that travels obliquely from one transparent medium into another will change its direction in the second medium.
Reason :
Refraction is due to change in the speed of light as it enters from one transparent medium to another. Show Answer

Q85) Assertion :
The refractive index of kerosene is 1.44 which is optically denser than water.
Reason :
The mass density of kerosene is lesser than water. Show Answer

Q86) Assertion :
Owls can move freely during night.
Reason :
They have large number of rods on their retina. Show Answer

Q87) Assertion :
The air bubble shines in water.
Reason :
Air bubble in water shines due to refraction of light. Show Answer

Q88) Assertion :
Large concave mirrors are used to concentrate sunlight to produce heat in solar cookers.
Reason :
Concave mirror converges the light rays falling on it to a point. Show Answer

Q89) The measure of how much light bends in a medium is : Show Answer

Q90) Refractive index of ethanol is 1.361 and it's known that benzene is optically dense than ethanol. Which could be the refractive index of benzene : Show Answer

Q91) Refractive index does not depend upon which of the following factor : Show Answer

Q92) Diamond sparkles more than a similar cut glass piece. reason being : Show Answer

Q93) For a plane mirror image formed is :
(I) erect and virtual
(II) same size as the object
(III) laterally inverted Show Answer

Q94) In a plane mirror, the image formed is : Show Answer

Q95) A plane mirror reflects a pencil of light to form a real image. Then the pencil of light incident on the mirror is : Show Answer

Q96) What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other ? Show Answer

Q97) Binocular is basically a : Show Answer

Q98) Prisms are used in binoculars : Show Answer

Q99) Binoculars are used to see : Show Answer

Q100) Refractive index of air is : Show Answer

Q101) The lens facing object in binocular is called : Show Answer

Q102) Mirage is caused due to ... Show Answer

Q103) What is mirage ? Show Answer

Q104) What are the two types of mirage ? Show Answer

Q105) How a mirage is formed ? Show Answer

Q106) Mirage is observed mainly during ... days. Show Answer

Q107) For a real object, which of the following can produce a real image ? Show Answer

Q108) An object at a distance of +15 cm is slowly moved towards the pole of a convex mirror. The image will get .... Show Answer

Q109) A convex mirror is used : Show Answer

Q110) Mark the correct statement : Show Answer

Q111) Which of the following statements is true? Show Answer

Q112) Direction: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Plane mirror may form real image.
Reason (R): Plane mirror forms virtual image, if object is real. Show Answer

Q113) Direction: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): The image formed by a concave mirror is certainly real if the object is virtual.
Reason (R): The image formed by a concave mirror is certainly virtual if the object is real. Show Answer

Q114) Direction: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): An object is placed at a distance of f from a convex mirror of focal length f, its image will form at infinity.
Reason (R): The distance of image in convex mirror can never be infinity. Show Answer

Q115) Direction: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A):If the rays are diverging after emerging from a lens; the lens must be concave.
Reason (R): The convex lens can give diverging rays. Show Answer

Q116) Direction: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Refractive index of glass with respect to air is different for red light and violet light.
Reason (R): Refractive index of a pair of media depends on the wavelength of light used. Show Answer

Q117) Direction: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A):Light travel faster in glass than in air.
Reason (R): Glass is denser in air. Show Answer

Q118) If the focal length of the concave mirror is 10cm, the image formed will be at a distance __________. Show Answer

Q119) In case of concave mirror, the image distance is _____ when image is formed in front of the mirror and ________ when the image is formed behind the mirror. Show Answer

Q120) If the size of the object in in the given figure is 5 cm and the magnification produced is -0.5. The size of the image is (in cm) _______. Show Answer

Q121) A negative sign in the magnification value indicate that the image is_______ Show Answer

Q122) An image formed by concave mirror is virtual, when the object is placed: Show Answer

Q123) Which type of mirror should he use and why? Show Answer

Q124) At what distance, in terms of focal length 'f' of the mirror, should he place the candle flame to get the magnified image on the wall? Show Answer

Q125) To get the diminished image of the candle flame, the object must to placed at: Show Answer

Q126) If the image formed by this mirror is inverted and real, the magnification will be: Show Answer

Q127) A virtual image formed by concave mirror is: Show Answer

Q128) A student obtains a blurred image if a distant object on a screen using a convex lens. To obtain a distinct image on the screen. He should move the lens
Show Answer

Q129) Suggest the type of mirror he should use: Show Answer

Q130) Find the linear magnification of the image produced. Show Answer

Q131) When object distance is less than focal length the image is _______ and when object distance is more than focal length the image is______. Show Answer

Q132) What is the distance between the object and its image? Show Answer

Q133) The image formed in the above case is: Show Answer

Q134) In which direction does he move the lens to focus the flame on the screen? Show Answer

Q135) What happens to the size of the image of the flame formed on the screen? Show Answer

Q136) What difference is seen in the intensity (brightness) of the image of the flame on the screen? Show Answer

Q137) What is seen on the screen when the flame is very close (at about 5 cm) to the lens? Show Answer

Q138) From the above table, find the focal length of lens without using lens formula: Show Answer

Q139) Which set of observation is incorrect? Show Answer

Q140) In which case, the size of the object and image will be same: Show Answer

Q141) What is the change in the image observed as the object is moved from infinity towards the concave lens? Show Answer

Q142) Which of the following statement is false for the formation of images by convex lens? Show Answer

Q143) Following are the possibilities of two emergent beams similar. Choose the correct answer: Show Answer

Q144) The light changes its path as its medium changes. Which 0f the following is an incorrect statement? Show Answer

Q145) What is the unit of refractive index? Show Answer

Q146) Light travel faster in: Show Answer

Q147) The nature of image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is Show Answer

Q148) You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is Show Answer

Q149) When object moves closer to concave lens, the image bu it shift Show Answer

Q150) The distance between the potical centre and point of convergence is called focal length in which of the following cases? Show Answer

Q151) A full length image of a distant tall building can definitely be seen by using Show Answer

Q152) In which of the following, the image of an object placed at infinity will be highly diminished and point sized? Show Answer

Q153) A person standing in front of mirror finds his image larger than himself. This shows that mirror is convex in nature. Show Answer