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InterviewSolution
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.
| 7201. |
The magnification produced by a spherical mirror is -3". List four informations you obtain from this statement about the mirror/image. |
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Answer» SOLUTION :(i) Inverted IMAGE (II) MAGNIFIED (iii) CONCAVE mirror (iv) Real image |
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| 7202. |
The ammeter, voltmeter and, resistors R_(1) and R_(2) connected in the circuit as shown below have been checked and found to be correct. On plugging the key, the voltmeter reads 4.5 V but the ammeter reads 1.5 A. This is most likely because the wires joined to : |
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Answer» resistor `R_(1)` are loose |
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| 7204. |
The reconstruction phase of disaster management is a very simple and lasts for a short time. |
| Answer» Solution :The RECONSTRUCTION phase of DISASTER management is a very complicated phase and takes long TIME. | |
| 7205. |
There are few forces acting at a Point P produced by strings as shawn, which is at rest, Find the forces F_1 & F_2. |
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Answer» Solution :Using RESOLUTION of forces 1N and 2N and then applying laws of vector addition. CALCULATE for `F_1 & F_2.` `F_(1)=1/sqrt2. N, F_(2)=3/sqrt2N`. |
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| 7206. |
Water Boiler, Electric cooker, Electric bulb, Electric motor. |
| Answer» SOLUTION :Electric Motor. It USES magnetic effect of electric current whereas other DEVICES USE HEATING effect of electric current. | |
| 7207. |
The speed of light in vaccum is _______ms^(-1). |
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Answer» `3xx10^(-8)MS^(-1)` |
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| 7208. |
Explain the importance of good communication with others. |
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Answer» Solution :Good COMMUNICATION is very important to REDUCE stress. Various WAYS of expression like estabilishing communication with friends, peers, cousins, TEACHERS and more importantly parents, NOTHING down our feelings, expressing our feeling with near and dear ones help us to relieve the stress. 2. Communicating to reduce stress is worth the effort because, it builds trust, helps better understanding, cooperation, harmony and more effective problem-solving ways. 
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| 7209. |
A passenger sitting in a car at rest, pushes the car from within. The car doesn’t move, why ? |
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| 7211. |
What is lateral displacement of a light ray passing through a glass slab ? |
| Answer» Solution :The SHIFTING of the light ray SIDEWAYS on emergence from a rectangular GLASS slab is called "LATERAL displacement". | |
| 7212. |
(a) What do you understand by the term "electromagnetic induction"? Explain with the help of a diagram. ltBrgt (b) Name one devices which works on the phenomenon of electromagnetic induction. (c ) Describe differentways to inducecurrentin a coilof wire. |
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| 7213. |
Sketch and label the diagram showing self and cross pollination . |
Answer» SOLUTION :
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| 7214. |
How is metal corrosion prevented? |
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Answer» SOLUTION :Methods of preventing corrosion : E.g : Stainless Steel 2. Surface Coating : It involves application of a protective coating over the metal. It is of the following types: (a) GALVANIZATION : It is the process of coating zinc on iron sheets by using electric current. (b) Electroplating : It is a method of coating one metal over another metal by PASSING electric current. (c ) Anodizing : It is an electrochemical process that converts the metal surface into a DECORATIVE, durable and corrosion resistant. Aluminium is widely used for anodizing process. (d) Cathodic Protection : It is the method of controlling corrosion of a metal surface protected is coated with the metal which is easily corrodible. The easily corrodible metal is called Sacrificial metal to act as anode ENSURING cathodic protection. |
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| 7215. |
On which factor does the colour of the scattered white light depend? |
| Answer» SOLUTION :SIZE of the PARTICLES of the MEDIUM through which it is PASSING. | |
| 7216. |
When do we say that the potential difference between two points of a circuit in 1 volt? |
| Answer» Solution :When a WORK of 1J is to be done for MOVING a CHARGE of 1C between these two points. | |
| 7217. |
Which bulb will glow With maximum brightness in case bulbs of different wattages are joined in series With a voltage source? |
| Answer» SOLUTION :The bulb With HIGHEST wattage (here highest resistance) will GLOW with maximum BRIGHTNESS as `P =I^2R and " here " P prop R`. | |
| 7218. |
If area ESF in figure 1.5 is equal to area ASB,, what will you infer about EF? |
| Answer» Solution :The TIME taken by the PLANET to move from E to F equals the time taken by the planet to move from A to B. | |
| 7219. |
Unit of electric potential is ____________. |
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Answer» AMPERE |
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| 7220. |
Electrical Power |
| Answer» SOLUTION : It is DEFINED as the ELECTRICAL energy PER UNIT time | |
| 7221. |
Observe. Explain importance of each of those in disaster management. Which are other such activities? |
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Answer» Solution :All the PICTURES shown in figure represent different methods to TRANSPORT VICTIMS of disaster. i. Picture a shows a victim or patient being carried onn STRETCHER. ii. Picture b. shows artificial breathing beig administered to the victim or patient who is lying unconscious. ii. Picture c shows the method to help victims who can hold their body UPRIGHT but are unable to use their hands. iv. Picture d and e show the various methods to lift and carry an injured person. v. Picture f shows the human crutch method. |
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| 7222. |
(i) Draw a ray diagram to show the formation of image by a convex lens when an object is placed in fron of the lens between its optical centre and principal focus. (ii) In the above ray diagram markthe object distance (u) and the image distance (v) with their proper signs (+ve or -ve as per the new Cartesian sign convention) and state howthese distances are related to the focal length (f) of the convex lens in this case. (iii) Find the power of a convex lens which forms areal, andinverted image of magnification -1 of an object placed at distance of 20 cm from its optical centre. |
Answer» Solution : (II) Relation: `1/f=1/v-1/U` (III) `m=-1, u=-20cm, v=?,f=?` Marketing of u and v Thus object is at 2F i.e. `2f=20 cm` `:.f=10cm =0.1 m` `p=1/f=1/0.1+10D` |
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| 7223. |
Annelida : Earthworm : : Platyhelminth : ……………. |
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| 7224. |
What property of the eye of the principle of motion pictures ? |
| Answer» Solution :Refraction of the LIGHT through the eye LENS is the basic principle for the visualization of pictures and MOTION. | |
| 7225. |
Which of the following correctly describes the magnetic field near a long straight wire____ |
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Answer» The field consists of straight LINES PERPENDICULAR to the WIRE |
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| 7226. |
What is chitin ? |
| Answer» Solution :Chitin is a type of polysaccharide . Its chemical formula is (`C_(8)H_(13)O_(5)N)_(n)`. It is a long - chain polymer of N - ACETYLGLUCOSAMINE , which is actually a derivative of glucose . It is a primary component of cell walls in fungi , the exoskeletons of arthropods, such as crustaceans and insects . In many medicines chitin is used . The industrial PROCESSES and the biotechnological experiments also use chitin . | |
| 7227. |
During the alpha decay process atomic number is .......... by 2 and mass number is decreases by ……. |
| Answer» SOLUTION :DECREASES. 4 | |
| 7228. |
Which are various ways to minimize stress ? |
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Answer» Solution :1. People relieve their mental stress by laughing loudly. 2. Various ways of expression like estabilishing communication with friends, PEERS, cousing, teacheer and more importantly parents, noting down our feelings, expressing our feeling with near and dear ones help us to relieve the stress. 3. Fostering hobbies like material COLLECTION, photography, reading, cooking, SCULPTURING, drawing, rangoli,dancing, etc. help us to properly utilize our free hours. 4. By diverting the energy and mind thowards positive thinking, automatically neutralized WOULD automatically neutralized our negative thoughts. 5. Learning and listening to the music, singing, etc. keeps us happy and drives away the stress. 6. Regular exercising, massaging, yoga, mediation, visiting the SPA, etc. also help to relieve the stress. |
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| 7229. |
On what effect of an electric current does an electromagnet work? |
| Answer» Solution :An electromagnet WORKS on the magnetic EFFECT of CURRENT. | |
| 7230. |
At which position will you keep an object in front of a convex lens so as to get a real image of the same size as the object ? Drow a figure. |
Answer» SOLUTION :Object will be at`2F_(1)` in front of the CONVEX lens so as to GET a real image of the same SIZE has the object. The image will be formed at`2F_(2)`. 
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| 7231. |
Draw ray diagrams for the following cases when a ray of light :(i) passing through centre of curvature of a concave mirror is incident on it.(ii) parallel to principal axis is incident on convex mirror.(iii) is passing through focus of a concave mirror incident on it. |
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Answer» SOLUTION :(i) The ray RETRACES its path BACK as shown here. (ii) After REFLECTION ray appears to diverge from the principal focus F of given mirror. (iii) The reflected ray travels parallel to principal axis of mirror. 
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| 7232. |
The equivalent resistance of a _________ circuit, the others do not work. |
| Answer» SOLUTION :PARALLEL | |
| 7233. |
An electric fuse is based on ............ . |
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Answer» the HEATING effect of the current |
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| 7234. |
Explain how the loss of heat (or transfer of heat) due to modes of transfer of heat is 1. Explain how the las minimised in a thermos flask. |
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Answer» Solution :Transfer of heat is thermos is minimised as under By conduction: As in conduction heat can transfer by contact of MATERIAL medium. In thermos air is evacuated between the WALLS so heat transfer in stopped by conduction mode. (ii) By convection: As convection mode also require material (fluid) medium and there is nothing between the walls of thermos so heat does not transfer by connection mode. day (iii) By Radiation: As Ag POLISH is coated opaque on inner and outer walls of thermos radiation obeys the laws of refraction and reflection so no refraction takes place through opaque wall. Reflection of outer radiation goes outside of innerwall goes inside. So the transfer of heat is minimised by polishing. (ii) (a) The element present in a group have the same valency. (b) The element present in a group have identical chemical properties. (c) The PHYSICAL properties of the ELEMENTS in the group vary gradually. (d) The atomic radii of the elements present in a group increases downwards |
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| 7235. |
What is bolting? How can it be induced artificially? |
| Answer» SOLUTION :Sudden shoot elongation FOLLOWED by flowering is KNOWN as bolting. Artifically bolting can be induced on rosette plants by the TREATMENT of Gibberellins. | |
| 7236. |
List any three differences between an alternatingcurrent and a direct current. |
| Answer» SOLUTION :`{:("DC","AC"),("It flows in one direction in the circuit" ,"It reverses its direction while FLOWING in a circuit."),("DC voltage cannot travel very far as it begins to lose energy.", "AC voltage can travel over longer distances WITHOUT much loss of power."),("The frequency of DC is zero." ,"The frequency of AC is 50 Hz or 60 Hz dependingupon the COUNTRY. "):}` | |
| 7237. |
Isothermal curves for a given mass of gas are shown at two different temperture T_(1) and T_(2) in Fig. State whether T_(1) gt T_(2) or T_(2)gt T_(1). Justify your answer. |
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Answer» Solution :`T=(PV)/(muR)`, `TalphaPV` [`muR=` constant] Since `PV` is greater for the CURVE at `T_(2)` than for the curve `T_(1)` therefore `T_(2) GT T_(1)`. |
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| 7238. |
Images formed by convex lenses for different position of the object. Object at infinity Image formation-(a) At focus F_(2) (b) Real, inverted and highly diminished |
Answer» SOLUTION :
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| 7239. |
Derive the Magnification of a compound. |
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Answer» Solution :MAGNIFICATION (MAGNIFYING power) of a compound microscope is the product of magnification of objective lens and the eye piece `M = M_(o) XX M_e` Magnification of eye lens `M_(o)=v/u` Magnification of eye lens `M_e =1+D/f` `M=M_o xx M_e` `M= v/u (1+D/(f_(E)))` This equation can also be written as `M=(v/(f_(0))-1) (1+D/(f_e))` |
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| 7240. |
Match: I {:("1. BARC", "(a) Kalpakkam"), ("2. india first atomic power station", "(b) Apsara"), (3. "IGCAR", "(c) Mumbai"),(4. "First nuclear reactor in india" , "(d)Tarapur"):} |
| Answer» Solution :1. (c) Mumbai , 2. (d) TARAPUR, 3. (a) Kalpakkam,(4) APSARA | |
| 7241. |
If five equal pieces of a resistance wire having 5 Omega resistance are connected in parallel, their equivalent resistance will be …………… . |
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Answer» `1/5 Omega` The equivalent resistance (`R_p`) of their PARALLEL combination is given by, `1/R_p = 1/R_1 + 1/R_2 + 1/R_3 + 1/R_4 + 1/R_5` `:. 1/R_p = 1/1+ 1/1 + 1/1 + 1/1 + 1/1` `:. 1/R_p = 5/1` `:. R_p = 1/5 Omega` |
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| 7242. |
Which of the following symptoms is likely to afflict an astronaut in space (a) swollen feet, (b) swollen face, (c) headache, (d) orientational problem. |
| Answer» SOLUTION :not affeceted in SPACE | |
| 7243. |
State the factors on which the induced emf in a coil rotating in a uniform magnetic field depends. |
| Answer» Solution :Induced emf SET up in the coil depends on [i] NUMBER of turnsofthe coil [ii] area of the coil [iii] SPEED of rotationof the coil and [iv] STRENGTH ofthe MAGNETIC field. | |
| 7244. |
A coil of insulated wire is connected to a galvanometer. What would be seen if a bar magnet with its south pole towards one face of the coil is (i) moved quickly toward it (ii) moved quickly away from it (iii) placed near its one face ? These activities are then repeated with north pole of the magnet. What will be the observations? (b) Name and define the phenomenon involved in above activities. (c) Name the rule which can determine the direction of current in each case. |
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Answer» Solution : (a) A coil of insulated wire is connected to a galvanometer and if a bar MAGNET with its south pole towards one face of the coil is (i) moved quickly towards it, the galvanometer is deflected towards the left. (ii) moved quickly AWAY from it, the galvanometer is deflected towards the right. (iii) placed near its one face, the deflection of the galvanometer is zero. If this activity is repeated with north pole of the magnet - (i) If the magnet is pushed into the coil, the galvanometer is deflected towards the right. (ii) If the magnet is WITHDRAWN form the coil, the galvanometer is deflected towards the left. (iii) If the magnet is held stationary inside the coil, the deflection of the galvanometer is zero.  (b) This PHENOMENON involved in this activity is 'Electromagnetic Induction'. The production of electric current by moving a magnet inside a fixed coil of wire is called electromagnetic induction. (c) The direction of induced current is determined by 'Fleming's Right Hand Rule'. 
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| 7245. |
What is a good fuel ? |
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Answer» Solution :A good fuel is one : (i) which has a high calorific VALUE, (ii) which has a proper ignition temperature, (iii) which burns without giving out any smoke or harmful gases, (iv) which burns smoothly and does not leave behind MUCH ASH after burning, and (v) which is CHEAP, easily available, easy to handle, safe to transport and convenient to STORE. |
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| 7246. |
What precautions are to be taken for those who are working in radiation laboratories? |
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Answer» Solution :(i) Radio - Iodine (`I^(131)`) is used to cure goiter. (ii) Radioactive materials should be kept in a thick walled lead container. (iii) Lead coated aprons and lead gloves should be used while working with HAZARDOUS radioactive materials. (iv) We should avoid eating while handling radioactive materials, (V) The radioactive materials should be handled only by tongs or by a remote control DEVICE. (vi) Dosimeters should be worn by the users to check the level of radiation. |
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| 7247. |
Observe the diagram given and answer the question asked. e. What are the changes observed in the image formed before correction and after correction. |
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Answer» Solution :Before the correction the image is formed in FRONT of the RETINA. As the CONCAVE lens DIVERGES the rays, the image is pushed behind to be formed on the reatina. |
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| 7248. |
Find the total resistance of parallel connection of series resistors. |
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Answer» Solution :(i) A connection of a SET of series resistors connected in a parallel circuit, is a parallel -series circuit. (ii) Let `R_(1)` and `R_(2)` be connected in series to GIVE an effective resistance of `R_(S1)`. (iii) Similarly, let `R_(3)` and `R_(4)` be connected in series to give an effective resistance of `R_(S2)`. (iv) Then ,both of these serial segments are connected in parallel (Figure).  Using the equation `R_(s) = R_(1) +R_(2)` `R_(s1) = R_(1) +R_(2)` `R_(s2) = R_(3) +R_(4)` FINALLY , using equation `((1)/(R_(p)) = (1)/(R_(1)) +(1)/(R_(2)))` , the net effective resistance is given by `(1)/(R_("total")) = (1)/(R_(s1)) +(1)/(R_(s2))` |
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| 7249. |
The power (P) of a lens of focal length (f) is given by |
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Answer» P = F `P = (1)/(f)` |
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| 7250. |
Microbial enzymes are said to be eco-friendly. |
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Answer» Solution :(1) Microbial ENZYMES are active at low temperature, pH and pressure. (2) Due to this property, the energy is saved. The costlier erosion-proof instruments need out not be used. (3) In enzymatic reactions, the unnecessary byproducts are not formed as the reactions are highly specific. (4) The expenses on PURIFICATION of the product are minimized as no unnecessary products are formed. (5) The elimination and decomposition of waste MATERIAL is avoided and enzymes can be reused again. Hence, microbial enzymes are said to be eco-friendly. |
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