InterviewSolution
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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.
| 801. |
The percentage error in the measurement of mass and speed of a body are 2% and 3% respectively. What will bek the maximum percentage error in the estimation of kinetic energy of the body? |
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Answer» Solution :`K.E.=(1)/(2)mv^(2)` `THEREFORE (DELTAK)/(k)=(Deltam)/(m)+(2Deltav)/(v)implies(Deltak)/(k)xx100=(Deltam)/(m)xx100+2((Deltav)/(v))xx100` `therefore` Percentage ERROR in `K.E. = 3% + 2 × 2% = 7%` |
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| 802. |
An electric lamp is marked 60 W, 240 V. If it operats at 200, V the current through it will be |
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Answer» 0.18 A |
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| 803. |
You are given aluminium wire and copper Wire having the same dimensions. Which wire will carry more electric current if the applied potential difference is the same for the two wires? |
| Answer» SOLUTION :COPPER WIRE | |
| 804. |
In what way can the magnitude of an induced current be increased ? |
| Answer» Solution :The magnitude of the inducedcurrent can be increased by [i] moving the MAGNET more quickly into or out of the COIL[ii]USE a stronger magnet [iii] INCREASES the number of turns in the coil. | |
| 805. |
Jay.s friend Devwas playingand that too with a magnet . Jay askedhimnot to play with a magnet . Eventhen Dev continuedplayingand broughtthemagnet verynear to the TVscreen . That TV, then gotdamagedand therewasa drak patch on thatarea of TV due to effect of magnetism . Jayinformedall of hisfriends to be aware of suchthingsin future . How was TV damagedto getdark patch . |
| Answer» Solution :TV set has an electromganetinstalled init . Whena magnet is brought closer to the TV screen , the TWO magneticfieldsinterfered with each OTHERAND spolied the FUNCTIONING of the TV. | |
| 806. |
Jay.s friend Devwas playingand that too with a magnet . Jay askedhimnot to play with a magnet . Eventhen Dev continuedplayingand broughtthemagnet verynear to the TVscreen . That TV, then gotdamagedand therewasa drak patch on thatarea of TV due to effect of magnetism . Jayinformedall of hisfriends to be aware of suchthingsin future . Nameany tow domesticdevice havingelectromagneticeffect . |
| Answer» SOLUTION :MOBILE phones and CD PLAYERS have ELECTROMAGNETIC effect . | |
| 807. |
The moment of inertia of a ring about one of it's diameter is I. What will be the moment of inertia about a tangent parallel to the diameter? |
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Answer» Solution :`I_(T) =I + MR^(2) =1/2mR^(2) + mR^(2)` `=3 XX 1/2 mR^(2)=3I` |
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| 808. |
Jay.s friend Devwas playingand that too with a magnet . Jay askedhimnot to play with a magnet . Eventhen Dev continuedplayingand broughtthemagnet verynear to the TVscreen . That TV, then gotdamagedand therewasa drak patch on thatarea of TV due to effect of magnetism . Jayinformedall of hisfriends to be aware of suchthingsin future . Whatvalues do you learn from Jay ? |
| Answer» Solution :We LEARN VALUESOF HELPFULNESS, KINDNESS , and caringof others. | |
| 810. |
Which wavelengthof light if best absorbed by chlorophyll ? |
| Answer» SOLUTION :RED COLOUR WAVELENGTH | |
| 811. |
Three masses 3 kg, 4kg nd 5kg are located at the corners of an equilateral triangle of side 1 m. Locate the centre of mass of the system. |
| Answer» SOLUTION :(X,y) = (0.54 m, 0.36 m) | |
| 812. |
Which changes occur in persons contitinusly using internet and mobile phones ? |
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Answer» Solution :1. Various physical problems like tiredness, headache, insomnia, forgetfulness, tinnitus, JOINT pains and problems in vision may arise due to radiation of cell phones. 2. More serious fact is those radiations PENETRATE the bones of children more effectively than the bones of ADULTS. 3. Persons continuosly using the computers and Internet become solitary. They cannot establish harmonious relations with relatives and other members of the society. 4. habitually, they become self-centered and thereby they may develop problems like autism and selfishness. 5. They become less sensitive towards OTHERS. 6. Chronic effect of such tendency is that they ar not ready to help others in need and hence they also do not get help when in need. |
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| 813. |
What happens to its resistivity when some impurity is added in a conductor ? |
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Answer» Increaes |
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| 814. |
Splitting of white light into seven colours is called : |
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Answer» Reflection |
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| 815. |
A block of mass 30 kg is pulled up a slope as shown in with constant speed by applying a force of 200 N parallel to the slope from the initial position A to the position B, (a)Calculate : (i)the work done by force in moving the block from A to B, and (ii)The potential energy gained by the block Take, g=10 m s^(-2) (b)Account for the difference in answers to parts (i) and (ii) |
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Answer» Solution :(a)Given :m=30 kg,F=200 N,AB=3 m and CB=1.5 m. (i)Work done by the force in MOVING the blockfrom A to B =Force `xx` displacemet in the direction of force or`W=FxxAB` `200 N xx3 m` =600 J (ii)The potential energy gained by the block U=mgh where h=CB=1.5 m `therefore U=30xx10xx1.5=450 J` (b)Out of the work done 600 J ,only 450 J is the useful work RAISES the potential energy of the block and the remaining work =600 J-450 J=150 J is spent against the force of friction between the block and the SLOPE which GETS converted into heat energy |
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| 816. |
Under what condition is the force by a current-carrying conductor placed in a magnetic field maximum ? |
| Answer» SOLUTION :When the DIRECTION of CURRENT is at right ANGLES to the direction of the magnetic field. | |
| 817. |
White appearance of the clouds is due to _______ . |
| Answer» SOLUTION :MIE SCATTERING | |
| 818. |
A system is in stable equilibrium. What can we say about its potential energy ? |
| Answer» SOLUTION :P.E. is MINIMUM. | |
| 819. |
The quantity expressed in ohm. |
| Answer» SOLUTION :ELECTRIC RESISTANCE | |
| 820. |
Find the circuit flowing through the following electric circuit: |
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Answer» Solution :In circuit COMBINED resistance `R_1` of the series grouping of `1 Omega and 3 Omega` RESISTORS `R_1=1+3=4 Omega` Combined resistance of parallel grouping of `6 Omega and R_1=4 Omega` resistors is `R_2` , where `1/R_2=1/6+1/4=(2+3)/12=5/12 implies R_2=2.4 Omega` `THEREFORE` TOTAL resistance of circuit `R=3.6+R_2+3=3.6+2.4+3=9 Omega` `therefore` Current flowing `I=V/R=(4.5 V)/(9 Omega)=0.5A` 
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| 821. |
"A compound 'X' on combustion gives a yellow flame with lots of smoke." What inference would you draw from this statement ? |
| Answer» Solution :Compound X is an unsaturated HYDROCARBON. Unsaturated HYDROCARBONS burn with a yellow FLAME because of incomplete combustion. | |
| 822. |
An air bubble of volume 1.0 cm^(3) rises from the bottom of a lake 40 m deep at a temperature of 12^(@) C. To what volume does it grow when it reaches the surface, which is at a temperature of 35^(@) C. ? Given 1 atm = 1.01 xx 10^(5) Pa. |
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Answer» Solution :`V_(1)=10^(-6)m^(3)` Pressure on hubble `P_(1)=` WATER pressure `+` ATMOSPHERIC pressure `=pgh+Patm` `=4.93xx10^(5)PA` `T_(1)=285k`, `T_(2)=308k` `(P_(1)V_(1))/(T_(1))=(P_(2)V_(2))/(T_(2))` `V_(2)=(4.93xx10^(5)xx1xx10^(-6)xx308)/(285xx1.01xx10^(5))=5.3xx10^(-6)m^(3)`. |
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| 823. |
___________ isotope is used for the treatment of cancer. |
| Answer» Solution :Radio Cobalt | |
| 824. |
Give reason for the Why ie lead-tin alloy used for fuse wires ? |
| Answer» SOLUTION :LOW MELTING POINT. | |
| 825. |
Weightof a person inside the lift while at rest is 50 N. What it the weighthe feelswhen liftmoves up with an acceleration of 9.8 ms^(-2) . |
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Answer» Solution :R= m(g+a) ( ` R to `Apparent WEIGHT ) mg= 50 N ma= 50 N R = mg + ma = 50 +50 R= 100 N Here Apparentweight (R) is greaterthan the acutal weight mg(=W) |
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| 826. |
A particle is moving in a circular path of radius r. The displacement after half a circle would be |
| Answer» Answer :C | |
| 827. |
State with reasons whether the following sentences are true or false. If the height of the orbit of a satellite increase, its velocity must be increase. |
| Answer» Solution :FALSE - As the height of the SATELLITES orbit from the EARTH SURFACE increasesthevelocity DECREASE. | |
| 828. |
Which of the following has the fastest process of heat transfer ? |
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Answer» conduction |
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| 829. |
Series combination of resistors and Parallel combination of resistors |
Answer» SOLUTION :
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| 830. |
Name the type of reaction. |
| Answer» SOLUTION :This is a THERMAL DECOMPOSITION REACTION. | |
| 831. |
What is meant by a satellite? |
| Answer» Solution :A celestial BODY orbiting the EARTH or any other planet in our solar system is CALLED as a SATELLITE. | |
| 832. |
The resistivity of alloys is usually |
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Answer» more than its CONSTITUENTS |
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| 833. |
For an object at infintiy, a concave mirror produces an image at its focus which is |
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Answer» enlarged |
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| 834. |
Nocturnal animals (animal which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this. |
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Answer» |
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| 835. |
A ball of mass m is thrown vertically up with an initial velocity so as to reach a height h.The correct statement is : |
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Answer» Potentialenergy of the BALL at the GROUND is MGH. |
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| 836. |
Which one of the following is renewable? |
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Answer» coal |
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| 837. |
The change in …………….Of light rays whil going from one medium to anoher is called refraction. |
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Answer» Solution :direction. Explantion : The light GETS refracted when crossing the BOUNDARY from one medium into another,because the SPEED of light is defferent in different media. |
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| 838. |
A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself. Draw diagram to justify the statement. |
Answer» Solution : The emergent RAY CD is PARALLEL to the incident ray AB, but it has been LATERALLY displaced by a perpendicular DISTANCE CN with respect to the incident ray. |
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| 839. |
What is velocity of light in water ? |
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Answer» Solution :Refractive index of water is N = 1.33 velocity of light in water is c/n = `3XX10^(8)(1.33)=2.25xx10^(8)ms^(-1)`. |
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| 840. |
Handlein a door is always placedat the edgeof door . Why ? |
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Answer» Solution :The DOOR can be easily OPENED or closed if we apply the forceat a POINT far away from the fixed ADGE . (i) In this case , the effect of the force we apply is to rotatethe door about the fixed adge . (ii) This rotational effect of the appliedforceis more about the 'axis of rotation ' when the distancebetween the fixed edge and the point of application of force is more . |
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| 841. |
A glass slab made of a material of refractive index n_(1) is kept in a medium of refractive index n_(2). A light ray is incident on the slab. Draw the path of the rays of light emerging from the glass slab, if (i) n_(1)gt n_(2)(ii) n_(1)=n_(2)(iii)n_(1)lt n_(2). |
Answer» SOLUTION :The PATH of LIGHT RAYS have been SHOWN here.
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| 842. |
Sunny Dayal is a car driver working for Mr. Khanna. One day Sunny Dayal complained that he had difficulty in driving car because he could not see the distant traffic (car, buses, scooters, motorcycles and people) clearly though he could see the nearby things clearly. Mr. Khanna took Sunny Dayal to an eye hospital. The eye-specialist doctor checked and tested his eyes with various machines and gave him the name and power of lenses to be worn as spectacles. Mr. Khanna paid for the required spectacles for the driver. By wearing these spectacles, the driver could now see even the distant vehicles and people on the road clearly. He thanked Mr. Khanna for this. (a) Name the eye defect Sunny Dayal is suffering from. (b) What could be the two possible reasons for his eye defect ? (c) What type of lenses do you think have been recommended for Sunny Dayal's spectacles and why ? (d) Do you think Sunny Dayal has to wear these spectacles all the time ? Give reasons for your answer. (e) What could have been the risk if Mr. Khanna had not taken sunny Dayal to eye specialist doctor for the correction of vision by wearing spectacles ? (f) What values (or qualities) are displayed by Mr. Khanna ? |
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Answer» Solution :(a) Myopia (Short-sightedness or Near- sightedness). (b) (i) One reason for this eye defect is the high converging power of eye lens (because of eye lens being too convex or too thick). (ii) Another reason for this eye defect is that the eyeball may to long (because of which the distance of retina from the eye lens is more than normal). (c) The doctor recommended concave lenses for the spectacles of Sunny Dayal. This is because concave lenses are diverging lenses which will decrease the converging power of convex eye lenses. (d) No, Sunny Dayal has not to wear these spectacles when reading or writing. This is because Sunny Dayal's near vision is normal. He can see the NEARBY objects clearly even with naked eyes. (e) If Sunny Dayal had not worn spectacles to CORRECT his myopic vision, then the risk was that he could have CAUSED a car accident (because without spectacles he could not see distant vehicles and people clearly). (f) Mr. Khanna DISPLAYED the values of (i) General awareness (that eye-defect can usually be corrected by wearing spectacles containing suitable lenses) (ii) Concern for others (because he WANTED to mitigate or remove the suffering of driver) (iii) Concern for self and family (because he wanted to protect himself and his family from car accidents), and (iv) Kindness or Generosity (because he spent his own money in the hospital and for buying spectacles, which the driver could not afford). |
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| 843. |
Which are different trophic levels in food chain ? |
| Answer» Solution :Producers, PRIMARY consumers, secondary consumers, tertiary and `//` or apex consumers, omnivores are the DIFFERENT trophic levels in the FOOD CHAIN. | |
| 844. |
Distinguish between Transcription and Translation |
Answer» SOLUTION :
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| 845. |
From the top of a tower 100 m in height a ball is dropped and at the same time another ball is projected vertically upwards from the ground with a velocity of 25 m/s. Find when and where the two balls will meet ? (g = 9.8 m/s) |
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Answer» SOLUTION :For the ball CHAPPED from the top `x=4.9t^(2)"" ...(i)` For the ball thrown UPWARDS `100-x=25t-4.9t^(2)"" ...(ii)` From eq. (i) & (ii), `t=4s, x=78.4m` |
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| 846. |
Draw a ray diagram to show the position and nature of the image formed in the above case. |
Answer» Solution :The RAY diagram has been DRAWN below. Here AB is the object and A.B. is its virtual and ERECT image formed by the lens 
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| 847. |
The graph between current I and potential difference V in the experimental verification of Ohm's law were drawn by four students. Which one is correct? |
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Answer»
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| 848. |
(i) Give an example each (i) gas in liquid, (ii) liquid, (iii) solid in solid, (iv) gas in gas (ii) explain the types of double displacement reactions with examples. |
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Answer» Solution :(i) Carbon dioxide DISSOLVED in water (ii) Sodium chloride dissolved in water (III) Copper dissolved in GOLD (iv) Mixture of Helium - Oxygen GASES. |
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| 849. |
Hobbies like rearing pet animal helps to create a ___________ |
| Answer» SOLUTION :Hobbies like rearing pet animal HELPS to create a ` ul ( POSITIVE MINDSET) ` | |
| 850. |
Alcoholism does not cause any harm to nervous system, however it decreases efficiency of liver. |
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Answer» Solution :FALSE. Alcoholism DECREASES efficiency of NERVOUS system and LIVER. |
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