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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.
| 4451. |
Give scientific reasons for thefollowingstatements :We usepowersupply of two differentcurrentratingat ourhomes . |
| Answer» SOLUTION :Each electrical appliancehas its ratingand draws currentaccording for its functioning . To avoidoverloadingand short -ciruciting, two separate CIRCUITS areused in electrical wiringathome , one of 15A for appliances withhigherr powerrating and anotherof 5A for bulbs, TUBES, fans , ETC . | |
| 4452. |
Light rays travel from vacuum into glass whose refractive index is 1.5If the angle of incidence is 30^(@) calculate the angle of refraction inside the glass. |
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Answer» SOLUTION :ACCORDING to Snell . s law, `(sini)/(SINR)=(mu_(2))/(mu_(1))` `mu_(1)sini-mu_(2)sinr` Here `mu_(1)=1.0mu_(2)=1.5,i=30^(@)` `(1.0)sin30^(@)=1.5sinr` `1XX(1)/(2)=1.5sinr` `sinr=(1)/(2xx1.5)=(1)/(3)=(0.333)` `r=sin^(1)(0.333)` `r=19.45^(@)` |
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| 4453. |
Peripatusis said to be aconnectinglink between Annelida and Arthropoda. |
| Answer» Solution :(1) Peripatus SHOWS segmented BODY, thin cuticle and parapodia-like organs. (2) These characters are typical of Annelids. (3) Similarly, it also shows tracheal respiration andopen CIRCULATORY SYSTEM which is a characteristicfeature of Arthropods. (4) Since Peripatus shares both these characters, it is said to be a connecting link between Annelida and Arthropoda. | |
| 4454. |
Which type of electric force acts between the proton and the electron? |
| Answer» SOLUTION : ATTRACTIVE ELECTRIC FORCE | |
| 4455. |
On what factor does the colour of the scattered light depend ? |
| Answer» Solution :The COLOUR of the scattered LIGHT depends UPON size of the SCATTERING particle. | |
| 4456. |
Latent heat of fusion : |
| Answer» Solution :The heat ENERGY ABSORBED at constant temperature during transfomation of solid into LIQUID is called the latent heat of FUSION. | |
| 4457. |
Physical properties of metals and non metals |
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Answer» Solution :PHYSICAL state : Under ordinary conditions, METALS are GENERALLY solids. Exceptions : mercury and GALLIUM are liquies. Under ordinary ocnditions, nonmetals may be solids or gases. Exception :bromine is in liquid state. |
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| 4458. |
Which physical quantity is expressed in kWh? |
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Answer» WORK |
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| 4459. |
Hold a stone at the end of a spring balance .The pointer shows 5kg wt . Now release the spring balance . Then the pointer will read |
| Answer» Answer :D | |
| 4460. |
An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of length 10 cm. If the distance of the object from the optical centre of the lens is 20 cm, determine the position, nature and size of the image formed using the lens formula. |
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Answer» Solution :`f=-10cm,u=20cm,V=?` Using `1/f=1/v-1/u` we get `1/v=1/f+1/u` `=1/(-10)+1/((-20))` `=(-2-1)/20=-(3/20)` `v=(-20)/3CM` `m=(h_(1))/(h_(0))=v/u` or `h_(1)=v/xxh_(0)` `=(cancel(20))/(3xxcancel(20))xx5` `=5/3=.6cm` Image is VIRTUAL and diminished. |
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| 4461. |
Which source produce alternatingcurrent ? |
| Answer» Solution :AC GENERATOR (or powerhousegenerators), car ALTERNATORS , bicycledynamos are sourceof alternatingcurrent (AC). | |
| 4462. |
Explain the phenomenon of electromagnetic induction. Describean experimentto show that a current is set up in a closed loop when an external magnetic field passingthroughthe loop increases or decreases. |
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Answer» Solution :The phenomenon where a CHANGING magneticfield in a conductorinduces a current in anotherconductor is called electromagnetic induction. Experiment to showthat a current is SET up in a closed loop when an external fieldpassing through the loop increases or decreases : 1] Wind insulated copper wire on an insulating cylinder (made of cardboard or thick paper) as two COILS - coil 1 and coil 2 having large number of turns (say 100 and 50) as shown. 2] Connect coil 1 (having more number of turns) to a battery and plug key, and coil 2 to a galvanometer. 3] Insert the plug key and observe thedeflection in the galvanometer .Itshows momentary deflectionin one direction . 4] Now removethe plug key. Galvanometeragain shows deflection but in the oppositedirection. Inference : WHENEVER electric current through coil 1is changing (increasing or decreasing) , magnetic field associated with it alsochanges accordingly. Thiscause changes INTHE magnetic field experienced by coil 2 and hence a current is induced in it which is observed as a deflectionin the galvanometer.Thus, changing magnetic filed inducesa current in a closesloop. 
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| 4463. |
Most sensitive part of retina is called : |
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Answer» BLIND SPOT of eye |
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| 4464. |
How are the hereditary changes responsible for evolution? |
| Answer» Solution :Hereditary characters are transmitted from parental GENERATION to the offspring. These characters are maintained through inheritance. But the genes which are BENEFICIAL for the organisms in helping them to adapt to the environment are transmitted to the next generations in a greater proportion. This happens due to natural selection. The PROCESS of evolution happens at a very SLOW pace. The favourable genes are preserved in the SPECIES as they bring about better survival of the individuals. Such individual reproduces more efficiently and evolve. The individuals with unfavourable genes are not selected by nature and are thus removed from the population through natural death. The fuel for evolution is thus truly supplied by the hereditary changes. | |
| 4465. |
A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long. (a) to which class does it belong ? (b) Draw a diagram of the lever showing the position of the fulcrum F and directions of both the load L and effort E. (c) what is the mechanical advantage and velocity ratio if the efficiency is 100%? (d) What will be the mechanical advantage and velocity ratio if the efficiency becomes 50%? |
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Answer» (C) M.A.=1.8, V.R.=1.8 (d) M.A.=0.9, V.R.=1.8 |
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| 4466. |
How is an ammeter connected in a circuit to measure current flowing through it? |
| Answer» SOLUTION :In SERIES of the ELECTRIC CIRCUIT. | |
| 4467. |
State the laws of refraction |
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Answer» Solution :The incident ray , the refracted ray of light and normal to the refracting SURFACE all lie in the same PLANE . Second LAW of REFRACTION (i) The ratio of the sine of the angle of incidense and sine of the angle of refraction is equal to the ratio of refractive indices of the two media . This law is also known as SNELL .s law `(sini)/(sinr)=(mu_(2))/(mu_(1))` (ii) Refractive index gives us an idea of how fast or how slow light travels in a medium. The ratio of speed of light in vacuum to the speed of light in a medium is defined as refractive index `mu` of that medium. (iii) The speed of light in a medium is low if the refractive index of the medium is high and vice versa. (iv) When light travels from a denser medium into a rarer medium , the refracted ray is bent away from the normal drawn to the interface. (v) When light travels from a rarer medium into a denser medium , the refracted ray is bent towards the normal drawn to the interface. |
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| 4468. |
Define Radius of curvature (R_1 and R_2). |
| Answer» Solution :The RADIUS of the SPHERE of which of the face of the LENS forms a PART. | |
| 4469. |
A current - carryingsolenoid coil is suspended freely. In whichdirectionwill it settle ? Why ? |
| Answer» SOLUTION :In north - SOUTH direction BECAUSEIT behaves as bar magnet . | |
| 4470. |
Safe limit of exposure to radiation is 20 milli slevert per month. |
| Answer» SOLUTION :SAFE limit of EXPOSURE to radiation is 20 milli SIEVERT peryear. | |
| 4471. |
Define reflex arc. |
| Answer» Solution :The PATHWAY TAKEN by nerve impulse to accomplish reflex ACTION is CALLED reflex ARC. | |
| 4472. |
How has the traditional use of wind and energy been moditifed for our convenience ? |
| Answer» Solution :The traditional use of wind has been modified by using WINDMILLS and that of WATER by constructing hydroeletric POWER plants. | |
| 4473. |
Draw magnetic field lines produced around a current carrying straight conductor passing through cardboard. How will the strength of the magnetic field change, when the point where magnetic field is to be determined, is moved away from the straight wire carrying constant current ? Justify your answer. |
Answer» SOLUTION :Using compass needle. When we MOVE AWAY from the straight wire, the DEFLECTION of the needle decreases which implies the decreasing strength of the magnetic field.
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| 4474. |
Tell me who am I ? What is my class/phylum ? I am venomous , eight legged creature having chitinous exoskeleton . |
| Answer» SOLUTION :SCORPION , PHYLUM : ARTHROPODA. | |
| 4475. |
A current carrying conductor produces a magnetic field around it. Is there a similar magnetic field produced around a thin beam of moving : (i) electrons(ii) Neutrons Justify your answer. |
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Answer» Solution :(i) Yes(II) No A beam of moving electrons CONSTITUTES electric current but NEUTRONS are neutral, so no current and hence no magnetic FIELD is produced. |
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| 4476. |
An atom bomb is an example of |
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Answer» FUSION reaction |
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| 4477. |
Sketch a concept map to show structure of disaster management authority . |
Answer» SOLUTION :
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| 4479. |
Which of the following has a magnetic field like thatof a bar magnet ? |
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Answer» Current-carrying wire |
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| 4480. |
A uniform metre rule of weight 10gf is pivoted at its 0 mark. (i) What moment of force depresses the rule? (ii) How can it can be made horizontal by applying a least force? |
| Answer» SOLUTION :(i) 500gf cm (ii) By APPLYING a force 5 GF UPWARDS at the 100cm MARK. | |
| 4481. |
The work done by the heart is J J per beat .Calculate the power of the heart if it beats. 72 times in minute. |
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Answer» SOLUTION :Given :Number of beats in 1 minute=72 `therefore` Number of beats per second =`(72)/(60)=1.2` Power of heart =work done per second `1 J xx 1.2 s^(-1)` 1.2 J `s^(-1)` (or 1.2 W) |
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| 4482. |
Myopia, hypermetropia, colour-blindness, presbyopia |
| Answer» SOLUTION :colour-blindness Colour-blindness is CAUSED due to deficiency of conical cells in the RETINA while OTHERS are DEFECTS of an eye. | |
| 4483. |
Uses of Xantham gum : |
Answer» SOLUTION :
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| 4484. |
The xylem and phloem arranged side by side on same radius is called __________ . |
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Answer» radial |
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| 4486. |
The magnetic is effect of current was discovered by: |
| Answer» SOLUTION :Oersted | |
| 4487. |
What is a rainbow ? Draw a labelled diagram to show the formation of rainbow. OR Describe the formation of rainbow in the sky with the help of a diagram. |
Answer» Solution :A rainbow is a natural spectrum appearing in the sky after a rain shower. Rainbow is caused by DISPERSION of sunlight by tiny water droplets HANGING in the atmosphere after a rain shower. The water droplets act like small prisms. As shown in figure, the water droplets refract and disperse the incident sunlight. These rays are then reflected internally and finally refracted again and come out of rain drop. Due to the dispersion and INTERNAL reflection of LIGHT DIFFERENT colours reach the observer.s eye and rainbow is seen. An important point to be noted here is that a rainbow is always formed in a direction opposite to that of Sun. 
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| 4488. |
Planet mercury has no atmosphere. What is the colour of its sky ? |
| Answer» Solution :SINCE MERCURY has no ATMOSPHERE, no scattering of sunlight takes PLACE and its SKY appears black in colour. | |
| 4489. |
What are magnetic field lines? How is the direction of a magnetic field at a point determined ? Mention two important properties of magnetic field lines. |
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Answer» Solution :Magnetic field LINES are used to represent a magnetic field. A field line is the path ALONG which the north pole of a small compass TENDS to move. The direction of the magnetic field at a point is given by the direction in which north pole of compass placed at that point would take. Two properties of magnetic field lines are as follows: (i) In air field lines start from N-pole and end at S-pole. (II) No two magnetic field lines can ever intersect at any ONE point. |
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| 4490. |
Two electric bulbs have resistances in the ratio 1 : 2. If they are joined in series, the energy consumed in them are in the ratio |
| Answer» ANSWER :B | |
| 4491. |
Whatis meant by 'speciation'? List four factors that could lead to speciation. Which ofthese factorscannot be a major factor in the speciation of asexually producing organisms?Explain your answer. |
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Answer» Solution :Speciation is the process of formation of a new SPECIES from pre-existing ones. Four factors:(i) Genetic Drift, (ii) Natural SELECTION, (iii) Geographical ISOLATION, (iv) Severe changes in DNA/change in number of chromosomes/Mutation. |
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| 4492. |
The values of resistance marked on the coils R_(1) and R_(2) are found to be correct. A student connects the given resistors in the following manner (as shown in Figure 1). He then connects the terminals marked X and Y of the above combination of resistors R_(1) and R_(2) to the terminals marked X and Y in the circuit (shown in Figure 2). The average value of the ratio V/I in the obervations recorded in the circuit would be : |
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Answer» `9 OMEGA` |
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| 4493. |
…………… is used to observe parts of flower , insects and finger prints in the field of forensic science. |
| Answer» SOLUTION :SIMPLE MICROSCOPE | |
| 4495. |
Why does a tunnis ball bounce heigher on a hill than on plains? |
| Answer» Solution :The value of 'g' on HILLS is less than at the PLANE, so the weight of TENNIS ball on the hills is lesser FORCE than at planes that is why the EARTH attract the ball on hills with lesser force than at planes. Hence the ball bounces higher. | |
| 4496. |
The ratio of the size of the image to the size of the object is known as |
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Answer» the FOCAL plane |
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| 4497. |
A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is. ………………… |
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Answer» `N.=((v)/(v-v_(s)))n` `=((339)/(339-11.1))xx2000=1.03385xx200` n.=2068 Hz Data: v=1220 km/h (or) `339ms^(-1)` `v_(s)=40km//h` or `11.ms^(-1)` n=2000Hz |
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| 4498. |
Radio isotopes are used to diagnose the nature of __________. |
| Answer» SOLUTION :CIRCULATORY DISORDERS | |
| 4499. |
How much heat energy is necessary to raise the temperature of 2.5 kg of water from 20 ^@ C "to " 100^@C ? |
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Answer» Solution :Given Mass (m) `=2.5 kg,` secific heat of water ( c)= 1 kcal /`kg^@C` CHANGE in temperature `(Delta T)` `=100 -20 = 80 ^@ C` To FIND, heat ENERGY (Q) Formula : `Q-m c Delta T` Calculation: According to priniciple of heat exchange , Energy supplied to water = Energy gained by water From formula, `Q=2.5 xx 1 xx 80 ` = 400 kcal. |
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| 4500. |
Aanchal loves to eat cl1ips, burgers and chocolates. Her parents always discourage her to eat junk food. Answer the following questions based on the situation mentioned above. (i) Why do you think Aanchal's parents do not let her eat junk food? (ii) What values are they promoting? (iii) How can children be persuaded to eat healthy food? |
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Answer» SOLUTION :(i) (a) Junk food makes the person obese. (b) He/She may suffer from loss of appetite. (c) He/She may develop the problems related to his/her physical or MENTAL GROWTH. (d) It leads to wastage of money. (ii) Awareness REGARDING health, caring, loving nature. (iii) Inform them about advantages of eating healthy food and the health problems posed by junk food. |
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