InterviewSolution
Saved Bookmarks
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.
| 1151. |
There are two bodies of masses 1 kg and 100 kg reporated by a distance 1m. At what distance from the smaller body, the intensity of gravitational field will be zero |
|
Answer» `(1)/(9)m` |
|
| 1152. |
How are chromosomes classified based on the position of centromere ? |
|
Answer» SOLUTION :Thpes of CHROMOSOMES based on the position of centromere : (i) Telocentric (ii) ACROCENTRIC (iii)Submetacentric (iv) Metacentric |
|
| 1153. |
A disc rotating about its axis with angular speed omega_(0) is placed lightly (without any translational pull) on a perfectly frictionless table. The radius of the disc is R. What are the linear velocities of the points A, B and C on the disc shown in Fig. Will the disc roll in the direction indicated ? |
|
Answer» Solution :For A `V_(A) = Romega_(0)` in forward direction For `B=V_(B) = Romega_(0)` in backward direction For `CV_(C) = R/2 omega_(0)` in forward direction disc will not roll. |
|
| 1154. |
When is the force experienced by a current carrying conductor placed in a magnetic field largest ? |
| Answer» Solution :The force EXPERIENCED by a current CARRYING CONDUCTOR placed in a magnetic field is largest when the current - carrying conductor is placed in a DIRECTION perpendicular to that of magnetic field. | |
| 1155. |
If a current of 0.6 ampere is passed through a wire having resistance 15 Omega for 2 minute, calculate the heat generated in the wire in joule. |
|
Answer» Resistance (R) = `15OMEGA` Time (t) `=2xx60s=120s` `"To FIND:Heat (H)"` `"FORMULA:"H=I^(2)Rt` `"Calculation:From formula,"` `H=(0.)^(2)xx15xx120` `=0.30xx15xx120` `=648J.` |
|
| 1156. |
A convex lens can form a magnified erect as well as magnified inverted image of an object placed in fron of it. Draw ray diagram to justify thisby statement stating the position of the object with respect to the lens in each case. An object of height 4 cm is placed at a distance of 20 cm from a concave lens of focal length 10 cm. Use lens formula to determine the position of the image formed. |
|
Answer» Solution :Convex LENS form magnified erect image when object is PLACED betweenn `F_(1)` and optical centre O. Image formed is virtual, erect and enlarged and on the same side of the lens as the object.  Convex lens form magnified inverted image when object is placed at `F_(1)`. Image formed is real, inverted and enlarged at infinity.  Given focal length f=+10 cm (concave) OBject distance (u)=-20 cm For concave lens `1/f=1/v-1/u` we GET `1/f+1/u=1/v` `1/(-10)+1/(-20)=1/v` or `=1/10-1/20 ` or `1/v=(-2-1)/20=(-3)/20` `v=-20/3cm` `m=(h_(1))/(h_(0))=v/u` `h_(1)=v/uxxh_(0)` `=(-20)/(3xx-20)xx4=4/3=1.3cm` Image is diminished. |
|
| 1157. |
An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the transmission and reception of the wave is 1.6 seconds. What is the depth of the sea, if the velocity of sound in the seawater is 1400ms^(-1) |
|
Answer» Solution :SPEED of sound `=("Distance TRAVELLED")/("TIME TAKEN")` `v=(2d)/(t)` `d=(vt)/(2)=(1400xx1.6)/(2)` d=1120m The depth of the sea is 1120 m |
|
| 1158. |
Angular momentumof the particle rotating with a central force is constant due to |
|
Answer» constant force `T=(DL)/(DT) = 0 rArr L` = constant. |
|
| 1160. |
A converging lens forms a real image at a distance of 15 cm . Find the position of object of the focal length of the lens is 10 cm . Also, find the magnification. State the charecteristics of the image formed. |
|
Answer» SOLUTION :Given:v= 15 cm (REAL image ) f = 10 cm (Convex lens ) To find : Object DISTANCE (U) Magnificaion (M) Characterication of the image Solution:`1/v - 1/u = 1/f ` `1/15 - 1/u = 1/10` `therefroe"" 1/u = 1/15 - 1/10` `1/u = (2-3)/(30)` `1/u = -1/30 ` u = -30 `therefore` Distance of the image = 30 cm Magnification (M) = `v/u = 15/-30 = -0.5` ` therefore` Magnification = 0.5 The NEGATIVE sign indicates the image formed is real. The image formed will be rea, inverted and diminished. |
|
| 1162. |
When water is flowing through a pipe with a speed v, then its power is proportional to |
| Answer» Answer :C | |
| 1163. |
What are the components of Biogas? How is biogas produced ? Write any two advantages of this gas to the farmers. |
|
Answer» Solution :Components of Biogas: `CH_(4)` (Methane) gas main component, other component are `H_(2), CO_(2) and H_(2)S` gases. Biogas is produced by the anaerobic DECOMPOSITION of slurrymade from waste animal dung in a biogas plant by the bacteria. Two ADVANTAGES of Biogas : (i) FARMERS get clean and better domestic fuel. (ii) The spent slurry of the biogas plant can be used as manure in the crop fields. |
|
| 1164. |
How much time satellites take in low earth orbit? |
| Answer» Solution :DEPENDING on the height of their orbits, sateIJites complete ONE revolution in around 90 MINUTES. | |
| 1165. |
(a) Explain the various types of binary solutions based on the physical states of solute and solvent table. (b) State Henry's law? |
Answer» Solution :(a)  (b) Henry.s law states that, the SOLUBILITY of a gas in a LIQUID, is DIRECTLY proportional to the pressure of the gas over the solution at a definite TEMPERATURE. |
|
| 1166. |
What is meant by green energy? Which energy sources can be called green energy sources and why? Give examples. |
|
Answer» Solution :(1) Green energy MEANS eco-friendly form of energy which does not CAUSE environmental problems and are non-exhaustible, perpetual and sustainable. (2) These sources of energy do not pproduce toxic GASES or other pollutants, therefore they are safe. (3) Examples of green energy : (i) HYDROELECTRIC energy (II) Wind energy (iii) Solar energy (iv) Energy obtained biofuels. |
|
| 1167. |
How is F2 progeny obtained by self-pollination of Fl progeny different from Fl progeny ? Give reason for this observation. |
Answer» Solution :Organisms used by Mendel for his experiments was PEA plant. Mendel took a pure tall plant (TT) and CROSSED it with a dwarf (tt) plant. The progeny thus obtained was called Fl progeny (First filial progeny).  Then he self pollinated the Fl progeny to OBTAIN F2 generation  In F2 generation he FOUND that 75% PLANTS were tall and 25% were dwarf. |
|
| 1168. |
What is meant by magnetic field ? |
| Answer» Solution :The REGION SURROUNDING a MAGNET in which the force of the magnet can be DETECTED is said to be its MAGNETIC field. | |
| 1169. |
Explain how concave lenses are used in the following devices. Camera, telescopes and microscopes |
|
Answer» SOLUTION :Camera, telescopes and microscopes: These INSTRUMENTS MAINLY consist of convex lens but for better image QUALITY, a concave lens is PLACED in front of the eyepiece or inside it. |
|
| 1170. |
Explain the appplications of convex lenses used in the following instruments. Optical instruments |
|
Answer» Solution :Conves LENSES are USED in the FOLLOWING instruments. OPTICAL instruments: Convex lenses are used in different optincal instruments like camera, projector, SPECTROMETER, etc. |
|
| 1171. |
Figure shows a ray of light AO incident on a rectangular glass block PQRS, which is silvered at the surface RS. The ray is partily reflected and partly refracted. (a) Draw the path of the reflected and refracted rays. (b) Show at least two rays emerging from the surface PQ after reflection from the surface RS. (c) How many images are formed in the above case ? Which image is the brightest ? |
Answer» Solution :(a)  The COMPLETED diagram is shown in FIGURE in which OB is the reflected ray and OC is the refracted ray for the incident ray AO. (b) Two rays emerging from the surface PQ after reflections from the surface RS are labelled as 1 and 2. (c) Multiple (or infinite) images are formed. the second IMAGE formed DUE to FIRST reflection at C at the silvered surface RS, is the brightest. it is seen in the direction of ray 1. |
|
| 1172. |
By convention , the clockwisemomentsare taken as __________ and theanticlockwise momentsare taken as __________. |
| Answer» SOLUTION :NEGATIVE , POSITIVE | |
| 1174. |
A convex mirror used for rear view on an automobile has radius of curvature of 3.00 m. If a bus is located at 5.0 m from the mirror, find the position, nature and size of the image. |
|
Answer» Solution :Here R = + 3.0 m and u = - 5.0 m `therefore""(1)/(v) = (2)/(R) - (1)/(u) = (2)/((3.0)) - (1)/((-5.0)) = (2)/(3) + (1)/(5) = (10 + 3)/(15) = (13)/(15)` `therefore"" v = (15)/(13)` m = + 1.16 m The IMAGE is virtual, erect and diminished one and is FORMED behind the mirror. |
|
| 1175. |
The orbit of a planet is an ________________ with the Sun at one of the foci. |
|
Answer» |
|
| 1176. |
How does the leech suck blood from the host? |
| Answer» Solution :The leech makes a triradiate or Y shaped incision in the skin of the host by the jaws protruded through the MOUTH. The BLOOD is SUCKED by muscular PHARYNX and the salivary secretion is poured | |
| 1177. |
100 J of heat is producec! in eachsecond in a 4 Omega resistance. Find the potential difference across the resistor. |
|
Answer» Solution :H = 100 J, R = 4 N, t = 1 s, V = ? Now, Heat `H = I^2 Rt` So, we have the current through the resistor as `I = sqrt(H/(Rt))` `= sqrt((100J)/((4 Omega xx 1s)))` `=5A` THUS, the POTENTIAL. DIFFERENCE ACROSS the resistor, V is `V = IR` `= 5A xx 4 Omega` `=20V` |
|
| 1178. |
Every particleof matterin this universe ________ every other particles with a force . |
| Answer» SOLUTION :ATTRACTS | |
| 1179. |
State the factors on which at a given temperature the resistance of a cylindrical conductor depends, State the S.I unit of resistivity. |
|
Answer» Solution :Factors on which the RESISTANCE of a CYLINDRICAL CONDUCTOR DEPENDS : (i) Area of cross-section of the conductor. (ii) Nature of the material. SI UNIT of resistivity is ohm -m |
|
| 1180. |
A spring obeying Hooke's law has a force constant k. Now if the spring is cut in two equal parts, the force constant of each part is: |
| Answer» SOLUTION :FORCE constant of each HALF becomes twice the force constant of the ORIGINAL spring. | |
| 1181. |
We saw in this chapter that there are four main stake - holders when it comes to forests and wildlife which among these should have the authority to decide the management of forest produce? Why do you think so? |
|
Answer» SOLUTION :The people who live in or around forests and are dependent on FOREST products for VARIOUS aspects of life The forest department that owns that land and controls the forest resources and their PRODUCE. The wildlife and bnature ethusiasts who wants to conserve natire in its orginal from as for as possible. The local people who live in or around the forests must have more say in deciding the management of forest produce , They TAKE the materials only up to their needs from the forest resources and try to replenish these resources. |
|
| 1182. |
What is meant by the power of a lens? Give its SI unit. When two or more lenses are placed in contact what will be their combined power? |
|
Answer» Solution :The RECIPROCAL of the FOCAL length of a LENS is termed as power of lens. It is expressed in metres. SI unit is dioptre. The combined power will be equal to the ALGEBRAIC sum of their individual powers. |
|
| 1183. |
What precautions can be taken for preventing heart diseases ? |
|
Answer» Solution :(i) Prevention for preventing heart disease 1. Reduction in the intake of CALORIES, low saturated fat, cholesterol rich food, low carbohydrates and common SALT. 2. Increase in the intake of fibre diet, fruits and vegetables, protein, minerals and vitamins. 3. Regular exercise, walking and yoga and essential for body weight maintenance. 4. Avoid ALCOHOL consumption, Psychotrophic drugs and smoking. (ii) PROTINA, shakt and Rathna are lysine rich maize HYBRIDS, which are developed in India. |
|
| 1184. |
Identify the wrong statement among the following. Rewrite them by making necessary corrections. If the work done by the external forces on a system is negative then the energy of the system decreases. |
|
Answer» |
|
| 1185. |
The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give |
|
Answer» `2.75 and 2.74` |
|
| 1186. |
Prejudice againt traditional use of forest areas has no basic.Explain giving an example |
|
Answer» Solution :In MANY forests , the local population may not be allowed to use forests in the manner they have been using them for generations . This the sometimes be harmful for the SUSTAINABILITY of forests . When thenomadic shepherds were not allowed in the lapine meadows of the greatHimalayan National Park to graze their sheep , it had an adverse AFFECT on the growth of grass . Without regular grazing by sheep , the grass GREW very tall and then fell over preventingfresh growth. |
|
| 1187. |
Read Examples : 1, 2, 3 and 4 from page 162 and 163 . Now fill the following table. |
Answer» SOLUTION :
|
|
| 1188. |
An apple is falling from a tree. It has |
| Answer» Answer :C | |
| 1189. |
What happens to the resistance of a conductor when the length of the conductor is reduced to half? |
| Answer» Solution :The resistance of CONDUCTOR is REDUCED to ONE half of its previous value. | |
| 1190. |
Which of the following is correct? |
|
Answer» `0K = 273^@ C` |
|
| 1191. |
(i) List three common refractive defects of vision. Suggest the way of correcting these defects. (ii) About 45 lac people in the developing countries are suffering from corneal blindness. About 30 lac children below the age of 12 years suffering from this defect can be cured by replacing the defective cornea with the cornea of a donated eye. How and why can students of your age involve themselves to create awareness about this fact among people? |
|
Answer» SOLUTION :(i) The three common refractive defects of vision are as follows: (a) Myopia (short-sightedness) : It is CORRECTED by USING spectacles having concave lenses of APPROPRIATE power. (b) Hypermetropia (far-sightedness) : It is corrected by using spectacles having convex lenses of appropriate power. (c) Presbyopia : This defect is corrected using bifocal lenses of appropriate power in which the upper part consists of a concave lens (to correct myopia) and the lower part consists of a convex lens (to correct hypermetropia). (ii) Eyes of a dead person can be donated to the person having corneal blindness. It will help him/her see the world. We can also register ourselves to eye donation CAMPS who can preserve our eyes after our death and donate them to the needy. |
|
| 1192. |
Compare how an ammeter and a voltmeter are connected in a circuit. |
|
Answer» SOLUTION :AMMETER is connected in SERIES in a CIRCUIT. Voltmeter are connected in parallel in a circuit. |
|
| 1193. |
Form equation (1) and (2) what is the relation between h_(1), h_(2),u and v? |
|
Answer» Solution :1.The magnification produced by a lens is the RATIO of height of the image and the height of the object . `therefore` Magnification = `(Height of the image)/(Height of the object ) "i.e. M" = (h_(2))/(h_(1))…………..(1)` 2. Magnification produced by a lens is ALSO related to the object DISTANCE (u)and image distance (v). 3. from the equaitons (1) and (2) we can SAY that, M = `(h_(2))/(h_(1)) = v/u` |
|
| 1194. |
Distinguish between saturated and unsaturated fatty acids. |
Answer» SOLUTION :
|
|
| 1195. |
What is disperson of white light ? State its cause. Draw a ray diagram to show disperson of white light by a glass prism. |
|
Answer» Solution :(i) The phenomenon observed is dispersion of light which means splitting of white light into its constituent colours. It is caused because DIFFERENT constituent colours of light travel with different speeds in the prism and bend through different angles. (ii) In nature, this pehnomenon is observed in formation of rainbow. (iii) BASED on phenomenon of dispersion, we can CONCLUDE that : (a) White light consists of seven colours. (b) Violet light suffers MAXIMUM deviation and red light suffers minimum deviation. 
|
|
| 1196. |
Heatis liberated when _____. |
|
Answer» icemelts |
|
| 1198. |
Radium was discovered by |
| Answer» Solution :Marie curie | |
| 1199. |
Whichof thefollowingconditionsare observedwhenheatis suppliedto thesubstance? |
|
Answer» SOLID +LIQUID, Liquid |
|
| 1200. |
Which instrument detects the presenceof electric current in a circuit ? |
|
Answer» galvanometer |
|