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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 10101. |
An object is placed at a distance 8 cm from a concave mirror of radius of curvature 16 cm. What are the characteristics of image? |
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Answer» The image is real, inverted, and same size. |
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| 10102. |
The radius of curvature of a spherical mirror is 20 cm. What is the focal length? |
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Answer» Radius of curvature (R) = 20 cm R 20 Focal length (f) =R/2 = 20/2 = 10 cm. |
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| 10103. |
The radius of curvature of a concave mirror is 30 cm. If the object placed at 10 cm from the mirror, then the image isA) Magnified real image B) Diminished real image C) Diminished virtual image D) Magnified virtual image |
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Answer» D) Magnified virtual image |
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| 10104. |
Where did the white man live, in the lesson ‘Around the Medicinal Creeper’? |
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Answer» At Hulihindalu. |
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| 10105. |
Have you ever observed the image of the sky in rain water pools on earth? Explain the reflection of light in this context |
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Answer» Surface of the rain water pool acts as a plane mirror, because of its surface. The light rays from the sky and clouds incident at this surface and reflect. Hence, the images of the sky and clouds appear in the rain water pools. smooth |
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| 10106. |
Radius of curvature = …………… × focal length A) 3 B) 4 C) 2 D) 5 |
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Answer» Correct option is C) 2 |
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| 10107. |
The entire system of Indian medicine suffers from a kind of ....... |
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Answer» The entire system of Indian medicine suffers from a kind of mystification. |
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| 10108. |
Distinguish between:Real image and Virtual image |
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Answer»
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| 10109. |
What is the difference between a real image and a virtual image ? Give one example of each type of image. |
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Answer» Real image can be obtained on a screen because light rays actually pass through a real image but virtual image cannot be formed on screen because light rays do not actually pass through a virtual image. Example:- The image formed on a cinema screen is an example of real image. The image formed by a plane mirror is a virtual image. |
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| 10110. |
Do bitter gourd flower have whorls? |
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Answer» No, bitter gourd flower has only three whorls. Either androecium or gynoecium are absent in them. |
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| 10111. |
What is a real image ? |
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Answer» The image that can be obtained on a screen is called a Real image. |
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| 10112. |
Give definitions of Plane mirror and Ray diagram. |
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Answer» Plane mirror: A plane mirror is that which has a planar reflective surface. Ray diagram: A diagram showing the paths of selected rays through an optical system. |
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| 10113. |
Can a plane mirror ever form a real image? |
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Answer» 1. Real image can only be formed when the reflected rays converge. 2. For plane mirrors it is not possible. 3. However if the reflected rays are converged it can form a reed image. 4. Consider a source of light at infinity (say sun) and plane mirror is very small in size, its reflected image will show a circular bright spot (image of sun) on the screen. |
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| 10114. |
A radius drawn from the centre of the circle to point on the circle will be …………… to the tangent to that point on the circle.A) parallel B) perpendicular C) equal D) none of these |
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Answer» B) perpendicular |
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| 10115. |
Find the odd man out:1. Torches, flood lights, head lamps of vehicles, rear view mirror.2. Side mirrors of cars, parking mirrors, flood lights, mirror fitted in shops.3. Virtual and enlarged, virtual and diminished, real and inverted, real and magnified.4. Image is laterally inverted, image is of same size, image is at same distance, image is diminished. |
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Answer» 1. Rear view mirror – In rear view mirrors, convex . mirror is used. Concave mirrors are used in the rest. 2. Flood lights – In flood lights concave mirror is used. Convex mirrors are used in the rest. 3. Virtual and diminished type of image is not formed by a concave mirror. All the other types of images are formed by a concave mirror. 4. Image is diminished is not a characteristic of image formed in a plane mirror. Rest of them are characteristics of plane mirror. |
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| 10116. |
How long did the author take to learn about the medicinal creeper? |
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Answer» Twenty years. |
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| 10117. |
What is the size of the image compared to the size of the object? |
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Answer» Size of the image is equal to size of the object. |
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| 10118. |
What is a real image? What is a virtual image? |
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Answer» Real image: The image formed due to convergence of light rays. The real image can be caught on the screen. Virtual image: The image that we get by extending the rays backwards is called a virtual image. A virtual image cannot be caught on the screen. |
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| 10119. |
What is angle of reflection ? |
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Answer» The angle between the normal and the reflected ray is called the angle of reflection. |
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| 10120. |
What is real image? |
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Answer» Real image: The image formed due to the converging of light rays is real. |
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| 10121. |
Choose correct matching option:Group- AGroup- B1. Electrodea) Dissociation into ions with passage of current2. Electrolysisb) Kerosene3. Electrolytec) Metallic rods used in electrolysis4. Good conductord) The material which allows passage of current5. Bad conductore) Salt solutionA) 1 – c, 2 – a, 3-d, 4 – e, 5 – bB) 1 – a, 2 – b, 3 – c, 4 – d, 5 – e C) 1 – b, 2 – c, 3 – d, 4 – e, 5 – a D) 1 – c, 2 – d, 3 – e, 4 – a, 5 – b |
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Answer» A) 1 – c, 2 – a, 3-d, 4 – e, 5 – b |
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| 10122. |
The rear view mirror used in vehicles is A) Plane B) Convex C) Concave D) None of these |
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Answer» Correct option is B) Convex |
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| 10123. |
What did the doctor advise for Krishna’s piles? |
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Answer» The doctor advised surgery for Krishna’s piles. |
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| 10124. |
What did the author do when he found the tuberous root of the medicinal creeper? |
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Answer» When the author found the tuberous root of the medicinal creeper, he ate a small piece of it, just to see how it tasted. |
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| 10125. |
The lens which is thin at the middle on both sides and thicker at the edges is ……………………. A) bi – convex B) concave – convex C) plano-concave D) bi concave |
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Answer» D) bi concave |
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| 10126. |
A lens is bounded by two spherical surfaces, thin at the middle and thicker at the edges is called …………………..A) bi convex lens B) bi concave lens C) piano – concave lens D) piano – convex lens |
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Answer» B) bi concave lens |
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| 10127. |
Which type of lenses are :(a) thinner in the middle than at the edges ?(b) thicker in the middle than at the edges ? |
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Answer» (a) Concave lenses. (b) Convex lenses. |
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| 10128. |
What is diffused reflection ? |
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Answer» Reflection from a rough or irregular surface is called irregular reflection or diffused reflection. |
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| 10129. |
A lens which has thick at the middle and thinner at the edges is called …………………… A) bi convex lens B) bi concave lensC) piano – concave lens D) micro lens |
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Answer» A) bi convex lens |
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| 10130. |
Show that the size of an object and its image are same. |
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Answer» 1. Stand in front of a big mirror. Observe your image. 2. Step back two feet and step forward one foot. Observe your image while you move to and fro. 3. You notice that your image also move. 4. Estimate the distance from you to the mirror and the distance from the mirror to the image. 5. Is the size of your image equal to your size? Place an object in front of the mirror. Compare the size of the object with its image. 6. We notice that irrespective of the size of mirrors, the size of image and the size of object are equal. |
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| 10131. |
What does virtual image mean? |
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Answer» Virtual image: Virtual image ¡s the image formed due to diverging of light rays. OR The image formed due to the extension of rays in the backward direction. |
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| 10132. |
What is an electrolyte ? |
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Answer» Electrolyte is a solution of substance through which current can pass. |
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| 10133. |
‘Godman’ refers to ...........(a) Mara(b) Krishna(c) Malayali sadhu. |
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Answer» (c) Malayali sadhu. |
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| 10134. |
“Hey, why did you pluck this, you fool?” said Mara. Here ‘fool’ refers to .......(a) Sanna(b) the author(c) medicinal creeper. |
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Answer» “Hey, why did you pluck this, you fool?” said Mara. Here ‘fool’ refers to Sanna. |
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| 10135. |
She might have put some seeds in the soil. Isn’t it? |
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Answer» Yes. She would sow some seeds in the soil to get new plants. |
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| 10136. |
Difference Object distance vs image distance. |
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Answer» Object distance (u): The distance between object and mirror is & killed object distance. Image distance (v): The distance between image and mirror is called image distance. |
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| 10137. |
Why does the image in plane mirror suffers lateral inversion? |
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Answer» The light rays which come from our right side get reflected from the plane mirror reach our eye. Our brain feels that the rays is coming from the inside of the mirror. That is why our right side looks like left side in the image. This is called right-left inversion or lateral inversion. |
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| 10138. |
Is it thicker in the middle or at the edge? |
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Answer» Magnifying glass and some spectacle are thicker in middle whereas some spectacles are thicker at edge. |
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| 10139. |
Do you have any idea that how plant overcome this situation? |
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Answer» 1. To overcome this problem, plants adopt different methods to disperse their seeds. 2. Seed dispersal takes place with the help of various agents. |
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| 10140. |
What is lateral Inversion ? |
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Answer» In the image formed by a mirror, the right of the object appears as left, and the left of the object appears as right. This is called Lateral Inversion. |
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| 10141. |
What do you add to distilled water for making it to conduct electricity? |
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Answer» Distilled water is poor conductor of electricity. In order to increase conductivity we should have to add either acid, base or salt. That will increase the conductivity of distilled water due to decomposition of these substances into constitute ions. |
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| 10142. |
What would your mother have done to grow a basil / tulasi plant in your house? |
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Answer» My mother sow the seeds of basil / tulasi in soil to grow the basil plant. |
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| 10143. |
What is Lateral inversion? |
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Answer» Lateral inversion: The image of an object reverses its direction on reflection is a lateral inversion (This means that objects that are on the right side, appear on the left side in the mirror.) |
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| 10144. |
Why do we prefer a convex mirror as a rear-view mirror in the vehicles? |
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Answer» It gives erect and small image and covers large distance. |
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| 10145. |
Why is there right-left inversion (lateral inversion) when we look into mirror? (OR) Explain the lateral (righ-left) inversion of the image in plane mirrors through an example |
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Answer» 1. The light rays which come from object get reflected from the plane mirror and reach our eye. 2. Our brain feels that the ray is coming from the inside of mirror. 3. So there is right-left inversion. |
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| 10146. |
Which among these is bad conductor of electricity? A) gold B) silverC) copper D) kerosene |
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Answer» Correct option is D) kerosene |
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| 10147. |
Give examples for good solid conductors and liquid conductors. |
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Answer» Examples for good conductors in solids: Silver, copper, iron, graphite, etc. Examples for good conductors in liquids: Mercury, acid solutions (HCl, H2SO4), base solutions (NaOH, KOH), salt solutions (NaCl, KCl), etc. |
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| 10148. |
Give examples for bad solid conductors and liquid conductors. |
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Answer» Examples for poor conductors in solids: Gold, platinum, etc. Examples for bad conductors in liquids: Distilled water, coconut oil, petrol, vegetable oil, kerosene, alcohol, etc. |
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| 10149. |
What is meant by lateral inversion? |
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Answer» The right appears as left in the image is called lateral inversion. |
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| 10150. |
Which path light tends to prefer? |
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Answer» Light selects the path which takes least time to travel. |
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