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.
| 4601. |
________ explained that the mass of an atom is concentrated in its central part called nucleus. |
| Answer» SOLUTION :ERNEST RUTHERFORD | |
| 4602. |
A ……………………… enables you to manoeuore a car easily by transferring a ……………………… to the wheels with less effort. |
| Answer» SOLUTION :STEERING WHEEL, TORQUE | |
| 4603. |
Describe an activity to determine the direction of magnetic field produced by a current carrying straight conductor. Also show that the direction of the magnetic field is reversed on reversing the direction of current. |
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Answer» Solution :Take a battery (12 V), a variable resistance (or a rheostat), an AMMETER (0 - 5A), a plug key and a long straight thick copper wire. Insert the thick wire through the centre, normal to the plane of a rectangular CARDBOARD. Take care that the cardboard is FIXED and does not slide up or down. Connect the copper wire vertically between the points X and Y, in series with the battery, a plug and key. Sprinkle some iron fillings uniformly on the cardboard. Keep the variable of the rheostat at a fixed position and note the current through ammeter. Close the key, so that current flows through the wire. Ensure that the copper wire placed between the points X and Y remains vertically straight. Gently tap the cardboard for a few times. Observe the pattern of the iron filings. You would FIND that the iron filings align themselves showing a pattern of concentric circles around the copper wire. This represents the magnetic field around the current- carrying conductor. The direction of magnetic field CHANGES on reversing the direction of current. 
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| 4604. |
Amount of scattering of light is directly proportional to fourth power of its wavelength. |
| Answer» Solution :CORRECT STATEMENT- Amount of SCATTERING of light is inversely PROPORTIONAL to fourth scattering, the energy of INCIDENT and scattered light are not same. | |
| 4605. |
How can you as an individual contribute or make a different to the management ofa) Forests and wildlife b) Water resources and c) Coal and petrolum |
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Answer» Solution : a) Forests and wildlife • Take part in community activities with focus on conserving forests and wildlife • As a TOURIST, follow all principles of CONSERVATION. • Help the organisations ENGAGED in conservation of forests and wildlife. b) Water resources • Save water in domestic use . • Install a system for rain water HARVESTING c) Coal and PETROLEUM • Save electricity whenever required • Install electric gadgets that use less power • Use public transport. |
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| 4606. |
Give two examples each of dimensionless constants and dimensional variables. |
| Answer» SOLUTION :DIMENSIONAL Constants : GRAVITATIONAL constant, plank’s constant.Dimensionless Constants : `π, e`. | |
| 4607. |
A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length. |
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Answer» <P> Solution :(a) The person is suffering from hypermetropia. Two possible CAUSES : (i) Greater focal length of the lens. (ii) Eye ball becoming smaller. Use CONVEX lens of focal length `u=-25cm` `v=-50cm`. `(1)/(f)=(1)/(v)-(1)/(u)=(1)/(-50)-(1)/(-25)` `=(-1+2)/(50)=(1)/(50)cm rArr f=50cm` `P=(100)/(50)="2 D is required 1"` |
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| 4608. |
If two heaters, each of power 1 kW are connected in parallel to a 250 V supply, their combined rate of heating will be |
| Answer» Solution :In PARALLEL combination total POWER`(P )=P_1 +P_2` | |
| 4609. |
What would happen if ther were no gravity? |
| Answer» Solution :If GRAVITATIONAL force of the Earth WOULD not have existed, then all the OBJECT would have floated in the AIR. Life would be unstable. | |
| 4610. |
A geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth's gravity at the site of the satellite ? Mass of the earth= 6xx10^(24)kg and radius =6400 km. |
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Answer» Solution :U= Potential at height `h= -(GM)/(R+h)` `U=(6.67xx10^(-11)xx6xx10^(24))/(6.4xx10^(6)+36xx10^(6))= -9.44xx10^(6) J"/"KG`. |
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| 4611. |
The maximum resistance which can be made using four resistors each of resistance 1/2 Omega is |
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Answer» `2 Omega` `R_(EQUIVAL ent)=4R=4 times 1/2=2 Omega` |
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| 4612. |
What is meant by power of a lens? Define its SI unit. |
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Answer» Solution :The power of a LENS is defined as the reciprocal of its FOCAL length (f) expressed in metres. SI unit of power is dioptre. One dioptre is defined as the power of a lens whose focal length is 1 METRE. |
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| 4613. |
Depending upon above information, explain the various effects of the disaster of railway accident. |
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Answer» Solution :(i) INJURIES or death of victims. (II) Possible ENVIRONMENTAL damage - chemical spillages, spillage of FLAMMABLE substances. (iii) Destruction of public property. (v) Financial losses. (v) Collapse of communication system. (vi) Disruption of rail traffic. (vii) Transport of commodities collapses. (viii) Shortage of beds in hospital. (ix) · Emotional and mental STRESS to victims and relatives. |
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| 4614. |
Answer the following : (sini)/(sinr) = constant =n 1. State the law related to their formula. |
| Answer» Solution :For a GIVEN PAIR of media, the ratio of sin I to sin R is a constant and is equal to the refractive INDEX of the second medium with respect to the first medium (n). This is known as Snell's LAW. | |
| 4615. |
What temperaturedifference between the surface water of an Ocean and its deeper water is necessary for the operation of ocean-thermal-energy conversion plants? |
| Answer» SOLUTION :`20^(C)` [ or more] | |
| 4616. |
Compare the properties of alpha, beta, and gamma radiations. |
Answer» SOLUTION :
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| 4617. |
Definecombinationreaction. Giveoneexamplefor anexothermiccombinationreaction . |
| Answer» Solution :A chemical reaction in which 2 or more reactants COMBINE to FORM a SINGLE PRODUCT, the reaction is known as combination reaction. | |
| 4618. |
Physical problems arising due to exessive use of mobile phones |
| Answer» SOLUTION :(1) HEADACHE (2) Vision problems (3) Joint pains | |
| 4619. |
Why can't two magnetic field lines cross each other? Draw the magnetic field lines (including field directions) of the magnetic field due to a long straight solenoid. What important property of this field is indicated by this fieldline pattern?Name any two factors on which the magnitude of the magnetic field due to this solenoid depends. |
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Answer» Solution :If two MAGNETIC FIELD lines will CROSS eachother, then there will be two DIRECTIONS of magnetic field at the point of crossing, which is not POSSIBLE in a magnetic field. The field around a solenoid is like that of a bar magnet. Two factors are: (a) Number of turns in the solenoid. (b) It depends on the magnitude of the current passing through the solenoid. |
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| 4620. |
(a) Write an activity for observing scattering of light in colloidal solution. (b) On the basis of this activity explain why sky appears red at sunrise or sunset. |
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Answer» Solution :(a) (i) Place a strong source of white light at the focus of converging lens. (ii) Allow the light beam to pass through a transparent glass tank containing clear water. In that clear water, dissolve 200g of sodium thiosulphate in about 2 L of clean water in the tank and add 1 to 2 mL of conc `H_(2)SO_(4)` acid. (iii)Allow the beam of light to pass through a circular hole made in a cardboard. Obtain a sharp IMAGE of circular hole on screen by USING converging lens. (b) At sunrise or sunset light travels long distance through thick layers of atmosphere. Blue and other lower WAVELENGTH get SCATTERED and only red light reaches earth. |
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| 4621. |
A body of mass m is moving with a uniform velocity U. A force is applied on the body due to which its velocity increases from u to v: How much work is being done by the force ? |
| Answer» SOLUTION :`(1)/(2)m(V^(2)-U^(2))` | |
| 4622. |
From Question 29, we can say that |
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Answer» the AVERAGE SPEED is 40km/h |
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| 4623. |
A body tied to one end of a string is made to revolve in a vertical circle. Derive an expression for the velocity of the body and tension in the string at any point. |
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| 4624. |
Out of the two, a toaster of 1kW and an electric heater of 2kW, which has a greater resistance? |
| Answer» SOLUTION :TOASTER has a GREATER RESISTANCE | |
| 4625. |
What is a stake holder? Name the stake holders who have their dependence on forests? |
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Answer» SOLUTION :A person who has interests or CONCERNS for some thing is called as stakeholder. 1. Local people of the FOREST : Who depend on forest for their survival. 2. Forest department: A government body which owns manages and controls the forest resources. 3. Industries : which use various forest products. 4. Wild LIFE conservationalists and enthusiasts: Who want to conserve nature. |
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| 4626. |
Heavier bodies need greater initial effort to put them in motion Way ? |
| Answer» SOLUTION :As F =ma so for given a, more force will be required to PUT a large MASS in MOTION. | |
| 4627. |
How can we determine the focal length and power of the concave lens required to correct a myopia eye ? |
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Answer» <P> Solution :Let x be the distance of the ACTUAL far point from the eye and hence from the concave lens placed close to the eye. The RAYS coming from infinity after refraction through the concave lens, appear to COME from the far point F.`:.` object distance `= u = -oo`, image distance `= v = -x`, focal length = f = ? By lens formula, `(1)/(f) = (1)/(v) - (1)/(u) = (1)/(-x) - (1)/(-oo) = (1)/(-x) + 0 = (1)/(-x)` `:.` Required focal length , f = -x. Required power , `P = (1)/(f) = (1)/(-x)` The NEGATIVE sign shows that the correcting lens is a concave lens. |
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| 4628. |
If the earth had no atmosphere, the sky would have looked. |
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Answer» brown |
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| 4629. |
According to the sign convention,…………… is always negative. |
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| 4630. |
Speed of light in a glass sample is 2.0 xx 10^(8) ms^(-1). Its refractive index is ____________. |
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| 4631. |
(a) Name that part of a box-type solar cooker which allows the sun's heat rays to enter the box but does not allow inside heat to go out.(b) Explain why, a plane mirror reflector is used in a box-type solar cooker. |
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| 4632. |
A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incidence is : |
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Answer» `0^(@)` |
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| 4633. |
During acent____________ is zero and during descent ______________ is zero. |
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| 4634. |
Measurement of specific heat by mixing method: |
| Answer» SOLUTION :`{:("HEAT lost by " "Heat gained ""Heat gained"),("= " "+ " " by WATER in "),("hot OBJECT" "by calorimeter "" calorimeter"):}` | |
| 4635. |
Choose the odd one out : Light, sound, heat, laws of planetary motion. |
| Answer» SOLUTION :LAW of planetarymotion. Others are RELATED to Newton. | |
| 4637. |
A positively charged particle (alpha particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is ............ |
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Answer» TOWARDS SOUTH |
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| 4638. |
Which of the following is a non-renewable energy source? |
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| 4639. |
Give reasons : Red colour is selected for danger signals. |
| Answer» Solution :Red COLOUR is selected for danger signals because it is LEAST scattered by FOG or smoke or air molecules and thus can be seen easily from a DISTANCE. | |
| 4640. |
(a)(i)Explain the functions of the thyroid hormones ? (ii)How are stem cells useful in regenerative process? (iii)What is palaeontology ? |
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Answer» Solution :(i) Functions of the thyroid hormone Increases oxygen CONSUMPTION in tissues. Production of energy by maintaining the Basal Metabolic RATE (BMR) of the body. Helps to maintain normal body temperature. Controls growth of the body, bone formation and development of gonads. Essential for normal physical, mental and personality development. Hence also knownas personality hormone (ii)Stem cells useful in regenerative PROCESS Sometimes cells, tissues and organs in the body may be permanently damaged or lost due to genetic condition or disease or injury In such situations, stem cells are used for the treatment of diseases, which is called stem- cell therapy.In treating neurodegenerative disorders LIKE Parkinson.s disease and Alzheimer.s disease neuronal stem cells can be used to replace the damaged or lost neurons. (iii) The study of fossils is known as Palaeontology. |
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| 4641. |
A chemical bond is an attractive force that holds the atoms together in a molecule or a compound. The element carbon is known to have the unique ability to form bonds with other similar atoms or atoms of other elements. This property of carbon has resulted in its having very large number of compounds. The carbon-carbon bond is also known to be very strong and hence stable. Answer the following questions based on above information: (i) Name the chemical bond formed between carbon-carbon atoms. How is this bond formed? (ii) Which two values are reflected in the nature of carbon resulting in its ability to form maximum number of compounds? (iii) How can these values be helpful in strengthening relationship in a family, organisation or even people of a nation? |
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Answer» Solution :(i) Covalent bond is formed between carbon-carbon atoms by the sharing of electrons. (II) Sharing (ability to share), NATURE to share and bonding with OTHERS. (III) Sharing of one's POSSESSIONS, jobs, resources, moments with others enable an individual, an organisation or even a society to live happily and comfortably. |
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| 4642. |
A body nis thrown vertically upward. Which of the following graphs correctly/represents the velocity of the body with time? |
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| 4643. |
What is atmospheric refraction ? Use this phenomenon to explain the following natural events : (i) Twinkling of stars (ii) Advanced sunrise and delayed sunset. Draw diagram to illustrate your answer. |
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Answer» Solution :The density of the atmosphere goes on decreasing as the distance above the sea level increases. Hence, the REFRACTIVE index of AIR also decreases. So, light from the sun or other stars undergo MULTIPLE refractions before reaching our eyes. This phenomenon is called as atmospheric REFRACTION. Variations in refractive index of different regions in the atmosphere due to atmospheric refraction causes the variations in intensity of the star light reaching our eyes. Hencee the stars appear to be twinkling.  Atmospheric refraction causes the light rays coming from the sun to be bent. So, the sun which is actually at a position below the horizon, APPEARS in the position above the horizon to a person on the earth. Thus, the Sun appears to rise early by about 2 minutes and set late by about 2 minutes. 
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| 4644. |
Explain the nature and scope of the disaster of flood with the help of six points . |
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Answer» Solution :The nature and the scope of the disaster of flood can be described according to the six points : Pre-disaster phase : Due to Indian Meteorological Department the warning predictions are are received before any climatic disaster strikes. If th e scope of the flood is predicted to be high, then the people who may be affected by the calamity are relocated to a safer area. (2) Warning ph . ase . In the warning phase the Government warns the general public about the forthcoming disaster of floods through mass media like radio, television, newspapers, etc. In recent times event he cellphone messages are sent to people for warning them. The people living in coastal areas will be worst affected and hence such people are given greater care and they are immediately made toleave their houses. They are taken to the safe places. (3) Emergency phase : When the flood waters actually start rising up, the low-lying areas are submerged. Houses, roads and shops everything goes under water. The rescue operations are CARRIED out by army men from National Disaster Rescue Force. They take every possible effort to rescue the trapped people. The emergency continues till the water does not recede. Later after the water starts receding, people who had been taken to places on heights, start coming back. During this phase, search, rescue operations, medical treatment, and first aid are all the aspects on which the attention is focussed. (4) Rehabilitation phase : The people affecteddue to floods are given emotional and financial support. The fields, farms, houses or cattle-shed are under water. Such people are given transient accommodations. Many cattle and other animals die by drowning. Their rotting carcasses have to be disposed as soon as possible because the decaying process SPREADS epidemics of diseases. People are given vaccinations to protect them from diseases of such kind. Special care of young children and senior citizens is taken during this period. Supply of food and drinking water is also very important task during this time. (5) Recovery phase : During recovery phase, the life comes gradually back to normalcy. The removal of dead, decaying MATERIAL and the debris is the first priority. The water connections and electricity is restored back. Various NGOs or Government organizations provide help of various kind to the affected people. This help is to be distributed to those who are in real need. This work is also done byDisaster Management Department. (6) Reconstruction phase : The houses and building that collapse due to floods are built back. Agri.cultural activiti.es start again. Roads and water supply is once again NORMALIZED. Schools and colleges start once again. THUS, the once flood affected area comes back to routine functioning again. |
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| 4645. |
Explain the working of an astronomical telescope using refraction of light. |
Answer» Solution :An astronomical telescope is an optical instrument which is used to SEE the magnified image of distant heavenly bodies like stars, planets, satellites and galaxies, etc.  Construction of Astronomical Telescope 1. An astronomical telescope consists of two CONVEX lenses, an objective lens and an eye piece. 2.Objective lens has diameter and larger focal length because of which maximum amount of light coming from the distant object can be collected. 3. On the other hand, the size of the eyepiece is smaller and its focal length is also less. 4. Both the lenses are fitted inside a metallic tube in such a way that the distance between them can be changed. 5. The principal axes of both the lenses are along the same STRAIGHT line. 6. Generally, using the same objective but different eye pieces, different amgnification can be obtained. Working of Astronomical Telesecope: 1. A parallel beam of light from a heavenly body such as stars, plantes or satellites falls on the objective lens of the telescope. 2. The objective lens forms a real, inverted and diminished image of the heavenly body. This image lies between the focus and the optical centre of the eye piece. 3. Now the eye piece forms a virtual, inverted and highly magnified image of object at infinity. When the final image of an object is formed at infinity, the telescope is said to be in 'normal adjustment'. 4. It should be noted that, the final image of object ( such as stars, planets or satellites) formed by an astronmical telescope is always inverted with respectto the object . But is does not matter WHETHER the image formed by an astronomaical telesocope is inverted or not, as all the heavenly bodies are usually sphrerical is shape. |
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| 4646. |
When a sound wave goes from one medium to another, the quantity X remains unchanged. X is |
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Answer» speed |
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| 4647. |
List two methods of producing magneticfields . |
| Answer» Solution :Magnetic fieldscan be produced by passinganelectriccurrentthrough (1) a straight CONDUCTOR , (2) a CIRCULAR loop and (3) a SOLENOID . | |
| 4648. |
An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain. |
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Answer» <P> Solution :POWER, `P=2kW=2xx1000W=2000W`Voltge, `V=220V` CURRENT drawn, `I=?` Power, `P=V xx I` `I=(P)/(V)=(2000)/(220)` `=9A` (approx) The current drawn by this electric oven is 9A whereas the fuse in the circuit is only 5 A capacity. When a high current of 9 A flows throughthe 5 A fuse, the fuse will get heated too much, MELT and break the circuit. Therefore, when a 2 kW power rating electric oven is operated in a circuithaving 5 A fuse, the fuse will blow off cutting off the power supply in this circuit. |
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| 4649. |
A sattelite in its orbit around earth is weightess on account of its….. |
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Answer» velocity |
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| 4650. |
In the context of conservation of natural resources, explain the term reduce. Identify any one material for this category. |
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Answer» Solution :Reduce. It MEANS using a material in lesser quantity as FAR as possible EXAMPLE : Water as a SOURCE |
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