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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.
| 8601. |
The proper representation of series combination of cells obtaining maximum potentail is |
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| 8602. |
What is meant by accomodation of the eye ? |
| Answer» Solution :The human eye has the ability to adjust its focal LENGTH according to the distance of object, which is KNOWN as POWER of ACCOMODATION. While viewing distant objects, ciliary MUSCLES of the eye relax which makes the eye les thinner. This increases the focal length of the eye lens so that a clear image of the object is formed on the retina. While viewing nearby objects, ciliary muscles contract which increases the curvature of the eye lens. This decreses the focal length of the eye lens so that a clear image of the object is formed on the retina. | |
| 8603. |
Whatis a compass ? Givebreifinformationabout it . |
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Answer» Solution :A compass is a device used to FIND (and show) the directionof magnetic fieldat a point . `to` A compass consists of a tinymagnet , usuallyin the form of a POINTER , pivoted suchthat it can rotate freely in a horizontal plane .  `to`The tiny magnet in the compass is also called magnetic needle(or justa needle ) . It is a small bar magnet . `to`Theends of the compass needle point approximatelytowards the geographic north and southdirection . `to` In , facttheypoint TOWARDS the magnetic south and north directionof the earth , as theearthbehaves liek a giant bar magnet . (Geographic polesof the earth do not exactly conicidewtih magnetic poles ). `to`The tip (one end ) of theneedlepointingtowards the north is called the north seeking or north poleand its tail ( theother end ) pointingtowards the south is called the south seeking or south POLE. |
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| 8604. |
What are the various reaasons of increase in stress which disturbs social health ? |
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Answer» Solution :Some of the reasons for the increase in stress leading to poor social health are : i. Increased competitio in OPPORTUNITIES for education, employment and business. ii. Loneliness and MENTAL stress in children due to reasons like nuclear family and parents staying outdoors for WORK. iii. Increased social disorder, crime and violence. iv. Persons turing ot crime and violence as easy means of earning money and finally BECOMING a victim of the same system. v. Stress in girls due to excessive bindings on them at home as compared to BOYS. vi. Stress in adolescent girls due to social evils like teasing and molestation as well as gender inequality. |
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| 8605. |
In a solar water heater, why is the storage tank placed at a higher level than the solar panel containing coils ? |
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| 8606. |
Semi-conductors are certain type, of metals which allow only partial current to pass through them in one direction only. In a solar cell, the pieces(wafers) of semi-conductor materials containing impurities are so arranged that potenti,ll difference develops between two regions of the semi-conductors when light falls on it . A lead storage battery is connected in the circuit which gets charged and can be used as and when desired. (i) How does conductivity of semi-conductors increases ? (ii) Name any four materials which act as a semiconductor . |
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Answer» Solution :(i) Conductivity of semi-conductors INCREASES when LIGHT falls on them and certain impurities are added to them. (ii) Materials like SILICON, Selenium, CADMIUM sulphide and Copper sulphide act as semi-conductors. |
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| 8607. |
0.5 amp current is passing through the 3 bulbs with 4Omega,12Omegaand8Omega resistances and they are connected in series ? Find the voltage of the combination. |
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Answer» Solution :I = 0.5 AMP `= 1/2` amp. VOLTAGE at bulb - 1 `(V_(1))=IR_(1)=1//2xx4=2V.` Voltage at bulb -2 `(V_(2))=IR_(2)=1//2xx12=6V.` Voltage at bulb - 3 `(V_(3))=IR_(3)=1//2xx8=4V.` Votage of the combination is `V=V_(1)+V_(2)+V_(3)` = 2 V + 6 V + 4 V = 12 V. 
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| 8608. |
Colour blind person does not get driving license. Justify. |
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Answer» Solution :1. Colour blind PERSON LACK conical cells responding to CERTAIN colours including red. 2. Therefore , these people cannot IDENTIFY red colour. |
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| 8609. |
A ray of light XY passes through a right angled isosceles prism as shown alongside Figure. (a) What is the angle through which the incident ray deviates and emerges out of the prism? 9b) Name the instrument where this action of prism is put into use. (c) Which prism surface will behave as a mirror ? |
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Answer» `XY=90^(@)`, (b) periscope, (c) the surface AB of the prism behaves as the mirror. |
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| 8610. |
What is the colour of the clear sky during day time. Give reason for it. |
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Answer» Solution :Clear sky appears blue Reason: When sunlight passes through the atmosphcrere having the MOLECULES of air and other fine particles, WHOSE size is smaller than the wave length of visible light, these molecules and particles SCATTER the blue colour more strongly than the other colours of spectnnn as the ,wavelength of blue colour is more This scattered blue light entcre our EYE, So, the colour of sky appears blue to us during DAY time. |
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| 8611. |
Four particles-proton, electron, alpha, and neutron-enter a region of constant magnetic field with same velocities. The magnetic field is perpendicularto the velocity .A] Which particle [s] are not be deflected by the magnetic field ?B] Which particle [s] are deflected by the magnetic field ?C] Which particle experiences maximum force ? Justify . |
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Answer» Solution :A] Only NEUTRON is not deflected by the magnetic field . Magnetic force is given by F = q v B. For a neutron, charge q = 0 and hence, F = 0 B] Proton, electron, and ALPHA particles are deflected as they CARRY a charge. C] Alpha particle experiences maximum force because it has the maximum charge. |
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| 8612. |
In which direction a ray of light bends while emerging out of a prism? |
| Answer» SOLUTION :TOWARDS the BASE of the PRISM. | |
| 8613. |
What'app Instagram, Facebook, Textbook |
| Answer» SOLUTION :TEXTBOOK.(All OTHERS are SOCIAL MEDIA) . | |
| 8614. |
Draw a symbol for variable resistor. |
Answer» SOLUTION :
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| 8615. |
The magnetic field of a ............ is like a magnetic field of a bar magnet. |
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Answer» current CARRYING wire |
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| 8616. |
Mass is associatedwith gravitational force is ____________. |
| Answer» SOLUTION :GRAVITATIONAL MASS | |
| 8617. |
Which phenomenon of vision is used in cinematography ? |
| Answer» Solution :PROPERTY of presistence of VISION is used in CINEMATOGRAPHY. | |
| 8618. |
A disc of radius a//4having a uniformly distributed charge 6C is placed in X-Y plane with its centre at (-a//2,0,0).A rod of length a carrying a uniformly distributed charge 8C is placed on the X-axis from x = a//4 to x = 6a//4. Two point charges -7 C and 3 C are placed at ((a)/(4) , - (a)/(4) . 0) and (-(3a)/(4) , 0) respectively. Consider a cubical surface formed by six surfaces x = +- (a)/(2) , y = +- (a)/(2), z = +- (a)/(2). The electric flux throgh the cubical surface is |
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Answer» `-2 C//in_(0)` |
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| 8619. |
A ray of light parallel to principal axis after reflection from concave mirror passes through……….. . |
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| 8620. |
D.C. : ____________ :: A.C. : oscillatory motion |
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Answer» SOLUTION :non-oscillatory motion A.C. exhibits oscillatory motion WHEREAS D.C. can increase, can be STABLE or can reduce ALSO but cannot be oscillatory. |
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| 8621. |
Define the unit of current. |
| Answer» Solution :UNIT of current is Ampere. Current is said to be 1 ampere if 1 coulomb of ELECTRIC charge FLOWS through it for 1 second. | |
| 8622. |
The error in the measurement of radius of a shpere if 2%. What would be the error in the volume of the sphere? |
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Answer» SOLUTION :`V=(4)/(3)piR^(3)` `(DELTAV)/(V)=3(DeltaR)/(R)implies(DeltaV)/(V)%=3xx2%=6%` |
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| 8623. |
Define an electric circuit , Draw a labelled, schematic diagram of an electric circuit comprising of a cell, a resistor , an ammeter, a volmeter and a closed switch. Distinguish between an open and a closed circuit. |
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Answer» Solution :A CONTINUOUS and closed path of an electric current is called an electric circuit. A LABELLED schematic diagram of an electric circuit showing a cell E , a resistor R, an ammeter A, a voltmeter V and a closed switch S is SHOWN here. An electric circuit is SAID to be an open circuit when the switch is in off mode (or key is unplugged and no current flows in the circuit . The circuit is said to be a closed circuit when the switch is in on mode (or key is plugged) anda current flows in the circuit. 
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| 8624. |
Define biodiversity . |
| Answer» Solution :The occurrence of different TYPES of GENES and species from all the habitatand ecosystem in a PARTICULAR place andvarious part of the EARTH is CALLED biodiversity. | |
| 8625. |
A railway carriage of mass 9000 kg moving with a speed of 36kmh^(-1) collides with a stationary carriage of same mass. After thecollisiion of the carriage get coupled and move together. What is their common speed after collision? What type of collision is this? |
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Answer» Solution :`m_(1)=9000KG,u_(1)=36km//h=10m//s` `m_(2)=9000kg, u_(2)=0,v=v_(1)=v_(2)=?` By conservation of momentum `m_(1)u_(1)+m_(2)u_(2)=(m_(1)+m_(2))v` `:.v=5m//s` TOTAL K.E before collision `=1/2 m_(1)u_(1)^(2)+1/2m_(2)u_(2)^(2)` `=45000J` Total K.E. after collision `=1/2(m_(1)+m_(2))v^(2)=225000J` As totla K.E. after collision `gt` Total K.E. before collision |
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| 8626. |
Mutation |
| Answer» SOLUTION :Sudden and DRASTIC CHANGE that OCCUR in the genetic material is CALLED mutation. | |
| 8627. |
If you could use any source of energy for heating your food, which one would you use and why ? |
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Answer» Solution :Fuel to be used should be EASILY accessible, should be EASY to store and transport and should be ECONOMICAL. If we are in city area, L.P.G. should be used since it does not produce POLLUTION, is easily available and is economical. In RURAL area, Gobar gas or biogas should be used. It is almost free has high calorific value and is pollution free. it is also renewable source of energy. |
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| 8628. |
A coil made up of an alloy ............ is used in the electric heater-cooker as a resistor. |
| Answer» SOLUTION :NICHROME | |
| 8629. |
The working of an electric generator is based on the heating effect of electric current. |
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Answer» SOLUTION :FALSE. The WORKING on an electric genertor is based on magnetic effect of electric CURRENT. |
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| 8630. |
A convex lens is known as a converging lens. Is there any condition when it does not behave as converging lens? |
| Answer» Solution :When rays of light PARALLEL to the principal axis of a convex LENS pass through the lens, they converge to a point on the principal axis. HENCE, a convex lens is KNOWN as a converging lens. | |
| 8631. |
(a) How will you distinguish between convex lens without touching them? (b) Linear magnification of a concave lens is always positive, whereas that of a convex lens can be both, positive or negative . Why? |
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Answer» SOLUTION :(a) N/A (B) N/A |
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| 8632. |
(a) What is an electromagnet ? Describe the construction and working of an electromagnet with the help of a labelled diagram. (b) Explain why, an electromagnet is called a temporary magnet. (c ) Explain why, the core of an electromagnet should be of soft iron and not of steel. (d) State the factors on which the strength of an electromagnet depends. How does it depend on these factors ? (e) Write some of the important uses of electromagnets. |
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| 8633. |
(i) Draw a ray diagram to show the refraction of light through a glass slab and mark angle of refraction and the lateral shift suffered by the ray of light while passing through the slab. (ii) If the refractive index of glass for light going grom air to glass is 3/2, find the refractive index of air for light going from glass to air. |
Answer» SOLUTION :  Diagram MARKING `/_r` and x (ii) `""_(a)n_(g)=3/2` `""_(a)n_(g)=1/(""_(a)n_(g))=1/(3//2)=2/3` Alternately, `(c_("AIR"))/(c_("glass"))=3/2` `(c_("glass"))/(c_("air"))=2/3` |
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| 8634. |
Take a small slab of ice, a thin wire, two identical weights. In the above experiment, the wire moves through the ice slab. However, the ice slab does not break. Why ? |
| Answer» Solution :When the thin wire with two equal weights attached to its ends is hung over the BLOCK of ice, it exerts pressure on the ice below it. DUE to this, the melting POINT of ice below the wire is LOWERED and some ice melts. The wire passes through the water so formed. The water above the wire is no LONGER under pressure and, therefore,refreezes. Once again the ice below the wire melts, and the wire passes through it, and the process continues. In this way, due to alternate melting of ice and refreezing of water, the wire cuts right through the block of ice leaving the block intact. | |
| 8635. |
GYNOECIUM |
| Answer» SOLUTION :PRODUCTION of female gametes of flower. PARTICIPATING in production of FRUITS. | |
| 8636. |
Sanctuary : |
| Answer» Solution :Sanctuary is the PROTECTED PART of the FOREST where wild LIFE, ANIMAL and plants are protected and conserved. Due to this aspect, the biodiversity is protected and wild animals are conserved from hunting and poaching. | |
| 8637. |
What will be the effect on focal length of a lens immersed in water ? |
| Answer» SOLUTION :FOCAL LENGTH will INCREASE | |
| 8638. |
Refraction, Refractive indexindex , Dispersion, Total internal reflection. |
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| 8639. |
What is meant by green energy ? Which energy sources can be called as green energy sources and why ? Give examples. |
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Answer» Solution : (i). Energy genrated from sources which are unlimited and environmental friendly is called GREEN energy. (ii). Energy sources which are unlimited and environment friendly are called as green energy sources. (iii) Green energysources are called so because they are naturally REPLENISHED and do not cause any harm to the environment. (IV). Example wind water reservoir sunlight BIOFUEL are called as green energy sources. |
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| 8640. |
State the laws of reflection. |
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Answer» Solution :(i) The incident wave, the NORMAL to the reflecting surface and the reflected wave at the point of INCIDENCE lie in the same plane. (II) The angle of incidence `anglei` is EQUAL to the angle of reflection `ANGLER`. |
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| 8641. |
Arrange the following fuels in the order of increasing calorific values (keeping the fuel with lowest calorific value first) : LPG, Coal, Alcohol, Dung cakes, Diesel |
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| 8642. |
A student constructed a box-type solar cooker and covered it with a glass place. Write the purpose served by the glass plate in the cooker. |
| Answer» SOLUTION :To create greenhouse effect/to TRAP the SOLAR HEAT. | |
| 8643. |
State the law of combination of resistances in parallel. |
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Answer» Solution :COMBINATION of RESISTORS in parallel: `R_(eq)=(R_(1)xxR_(2))/(R_(1)+R_(2))` |
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| 8644. |
A solid sphere is rolling on a frictionless plane surface about its axis of symmetry. Find ratio of its rotational energy to its total energy |
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Answer» Solution :Rot K.E. `=1/2 Iomega^(2) = 1/2 xx 2/5 MR^(2) xx V^(2)/R^(2)` (As `omega = V/R, I = 2/5 MR^(2)`) `=1/5 MV^(2)` TOTAL energy = Translation K.E. + Rot. K.E. `=1/2mv^(2) + 1/5 mv^(2) = 7/10 mv^(2)` `THEREFORE ("Rot. K.E.")/("Total Energy") =(1/5 mv^(2))/(7/10 mv^(2)) = 2/7` |
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| 8646. |
Why do some clouds appear white while some appear grey ? |
| Answer» Solution :Clouds CONSIST of WATER droplets WHOSE size is same as that of wavelength of visible light. Hence, they scatter all the colours of INCIDENT sunlight equally and the cloud appears white. The bottom PORTION of thick clouds appears grey because most of the sunlight is absorbed by the upper portion of the cloud before reaching its bottom. However, these clouds appear white when viewed from the top. | |
| 8647. |
Each human being is different' is an example of which level of biodiversity? |
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Answer» GENETIC DIVERSITY |
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| 8649. |
Prepare a list of five activities that you perform daily in which natural resources can be conserved or energy utilisation can be minimised. |
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Answer» Solution :(i)Unused water in the water BOTTLE may be used for watering plants. (ii)Close all the taps before you go to sleep. (iii)Avoid usinga hose pipe for watering plants and INSTEAD use a mug. (iv)Wash vehicles only when they are dirty. (v)Use fan and light only whenrequired. (vi)Use solar water HEATING DEVICES. (vii)Use CFL in place of conventional bullbs/ tubes. |
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| 8650. |
An experiment for tracing the path of a ray of light through a glass slab was set up in the laboratory and ray diagram was drawn as shown here. The teacher asked the students to identify the refracted ray. The correct answer is : |
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Answer» `SR` |
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