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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.
| 2401. |
Describe the activity with the help of diagram to establish the relationship between Current (I) flowing in a conductor and potential difference (V) maintained across its ends. |
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Answer» Solution :Aim : To establish the RELATIONSHIP between Current (I) flowing in a conductor and potential difference (V) maintained across its ends. Material required : 5 dry cellls of 1.5 V each, conducting wires, an ammeter. A volt meter, thin iron spoke of lenth 10 cm, LED and key. Diagram :  Procedure : 1. Connect a circuit as shown in the figure. 2. Solder the conducting wires to the ends of the iron spoke. 3. Close the key . 4. Note the reading of current from ammeter and difference from vol meter in the given table.  5. Now connect two CELLS (In series) INSTEAD of one CELL In the circuit. 6. Note the respective readings of the ammeter and voltmeter and the values in the table. 7. Repeat the same for three cells, four cells and five cells RESPECTIVELY. 8. Record the values of V and I corresponding to each case in the table. 9. Find `(V)/(I)` for each set of values. Conclusion : The ratio of `(V)/(I)` is constant. 10. From this activity we can conlude that the potential difference between the ends of the iron spoke (conductor) is directly to the current passing throug it. This means `VpropI.` |
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| 2402. |
(a) How does a centripetal force differ from a centrifugal force with reference to the direction in which they act? (b) Is centrifugal force the force of reaction of the centripetal force? ( c) compare the magnitudes of centripetal and centrifugal force. |
| Answer» SOLUTION :(a) They act in OPPOSITE directions (B) No ( C) `1:1` | |
| 2403. |
Mantle: |
| Answer» Solution :Protection of INNER delicate ORGANS. Mantle also SECRETES hard, calcareous shell. | |
| 2404. |
Mock drill is useful. Explain. |
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Answer» Solution :i. Mock drill is conducted to check the preparadness of the people in a locality, premise or building to face a disaster. ii. It helps to judge the efficacy of the system PREPARED for disaster redressal. iii. A virtual SITUATION of disaster is created to check the reaction time for any type of disaster. iv. Ever mock drill is observed and supervised by trained personnel who check the execution of plan designed for disaster redressal. v. For example, fire mock drils are arranged in various schools by fire FIGHTERS, which includes demonstrations like extinguishing the fire, rescuing the people trapped at higher floors of buildings, rescuign the persons WHOSE clothing have CAUGHT fire, etc. |
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| 2405. |
Does the current in the circuit change when the length or area of cross section or the material of the conductor is changed ? |
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Answer» SOLUTION :(i) The CURRENT becomes ONE half of the initial value when the length of the conductor is DOUBLED. (ii) The current is doubled when the area of the cross section is doubled. (III) The current changes when the material of the conductor is changed from copper to nichrome. |
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| 2406. |
Raman is a student of class X. Raman's mother was making tea in an old electric kettle having metal case. She switched on the power supply to the electric kettle. When Raman's mother touched the metal case of working electric kettle unknowingly, she got a severe electric shock. Raman put off the main switch quickly. After removing the kettle plug from socket, Raman found that the connecting cord was torn where it touched the metal case of the kettle. He also found that though the red and black wires of connecting cord were firmly connected to the two lower terminals of the power plug but the green wire of cord was not connected to the upper terminal of the plug. Raman replaced the torn connecting cord and also connected the three wires fo cord firmly to the power plug terminals. (a) Why did Raman put off the main switch quickly ? (b) What name is given to (i) red wire (ii) black wire, and (iii) green wire, of the connecting cord ? (c) Which wire, red, black or green, touched the metal case of electric kettle when Raman's mother got electric shock ? (d) Which safety device was not working in electric kettle circuit which could have prevented the electric shock ? (e) What values are displayed by Raman in this incident ? |
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Answer» SOLUTION :(a) Raman put off the main switch to cut off the electricity supply to faulty electric kettle so as to save his MOTHER. (b) (i) Red wire is LIVE wire (ii) Black wire is neutral wire, and (iii) GREEN wire is earth wire. (c) Red wire (or live wire) which is at a high potential of 220 volts was touching the metal case of electric kettle. (d) Earth wire. (e) The values displayed by Raman are (i) Presence of mind (in putting off the main switch) (ii) Concern for mother (to save her life) (iii) KNOWLEDGE of household electric wiring, and (iv) Application of knowledge (in daily life situations). |
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| 2407. |
Define one mole of a substance. |
| Answer» SOLUTION :The MASS of substance containing the same NUMBER of atoms as in exactly 12gof `C_(12)` atoms. | |
| 2408. |
The resistance of a wire of 0.01 cm radius is 10Omega. If the resistivity of the material of the wire is 50 xx 10^(-8)ohm meter, find the length of the wire. |
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Answer» SOLUTION :Given RADIUS `= 0.01 CM = 0.01 xx10^(-2) ` m . Resistivity `rho=50xx10^(-8) Omega` m. Resistance R =` 10 Omega` `R = rho (L)/(A) =rho (l)/(pir^(2))` `l= (Rpir^(2))/(rho)` `(10xx3.14xx0.01xx10^(-2)xx0.01xx10^(-2))/(50xx10^(-8))` `=(314xx10^(-4))/(50xx10^(-8)xx10^(5))` Length =`(6.28xx10^(-4))/(10^(-3))` =0.628 m . |
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| 2409. |
Which type/types of power generation involve maximum numberof steps pf energy conversion? In which power generation is the number minimum? |
Answer» SOLUTION :The maximum number of steps of ENERGY conversioun are INVOLVED in thermal power PLANT and nuclear power plant. 
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| 2410. |
What do you mean by social health ? Name the factors required for maintaining good social health. |
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Answer» Solution :i. Social health can be DEFIND as the ability of a person to establish GOOD RELATIONS with other persons. ii. The factors which are required for maintaining good social health are strong personality, having large number of friends and relatives, proper use of time during loneliness and with peer-group,respect and acceptance for OTHERS, TRUST in others, etc. |
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| 2411. |
The unit of electric potential is ohm |
| Answer» SOLUTION :VOLT is the UNIT of ELECTRIC POTENTIAL. | |
| 2412. |
What is the use of the black painted surface in solar heating devices ? |
| Answer» Solution :BLACK colour is a very good absorber of heat but a very poor reflector . So, it is used to absorb the maximum amount of heat from the sunlight . It is used in SOLAR heating DEVICES to MAXIMISE the absorption of heat to minimise heat LOSS due to reflection. | |
| 2413. |
Assertion : The fore exerted by the earth on a apple is more than that exerted by apple on the earth. Reason : The force on apple exerts on the earth is determined by the mass of the apple only. |
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| 2414. |
Compare and contrast fossil fuel and the sun is direct sources of energy ? |
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Answer» Solution :Fossil fuel are energy sources such as coal and petroleum obtained from underneath of earth.s crust they are directly available to human being for use hence fossil fuels are the direct source of energy these are limited in amount these are non RENEWABLE sources of energy because three cannot be replenished in nature fossil fuel TAKE millione of years for their formation. If the present fossil fuel of the earth gets exhausted its FORMATIONS will take several years. fossil fulls are also very costly. On the other HAND solar energy is a renewable and direct source of energy and will do so for the next five billion years, solar energy is available free of cost to all in unlimited amount it replenishes in the SUN itself. |
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| 2415. |
The volume of 50 g. of a substance is 20cm^(3). If the density of water is 1g.cm^(-3), will the substance float or sink ? |
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Answer» Solution :`"1. Density of substance"=("MASS")/("Volume")=(50g)/(120cm^(3))=2.58cm^(-3).` `"2. Density of water"=1gcm^(-3).` As the density of substance is greater than that water, so the substance will sink in water. |
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| 2416. |
Name one type of forest manage-ment programme, usually undertaken? |
| Answer» SOLUTION :MANAGEMENT of the EXISTING forests to ACHIEVE sustainable targets. | |
| 2417. |
How can you convert an AC into a DC generator? |
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Answer» Solution :An AC GENERATOR can be converted into a DC generator by replacing the solid ring arrangement with split ring arrangement. THEREFORE, the current PRODUCED in an AC generator is of ALTERNATING nature. |
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| 2418. |
What are the typeof inertia ? Give an example for each type . |
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Answer» Solution :(i) INERTIAOF rest : The RESISTANCEOF a body to changeits state of rest is calledinertia of rest . Eg : When you vigorously shake the branchesof a tree some of the leaves and fruit are detachedand they fall down . (ii) Inertiaof motion : The resistanceof a body to changeits state of motion is calledinertia of motion . Eg : An athlete runs somedistancebeforejumping . Because , this will help him JUMP longerand higher . (iii) Inertiaof direction : The resistanceof a body to change its direction of motion is called INERTIA of direction . Eg : When you make a SHARP turn while driving a car , you tendto lean sideways . |
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| 2419. |
Namethe two factorsthat completelydefinea magnetic field at a point . |
| Answer» SOLUTION :Thestrenght and the DIRECTION of MAGNETIC FIELD at thegivenpoint . | |
| 2420. |
Ostia and oscula : |
| Answer» Solution :WATER is taken inside the BODY through ostia. Through the osculum it is given out. This function is seen in animals BELONGING to phylum PORIFERA. | |
| 2421. |
A battery of 12 V is connected to a series combination of resistors 3Omega , 4 Omega, 5 Omega and 12 Omega. How much current would flow through the 12 W resistor ? |
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Answer» Solution :Current REMAINS same in SERIES combination `R_("series ") =R_(1)+R_(2)+R_(3)+R_(4)` `(3+4+5+12)=24 Omega` V=12 V `I =(V)/(R)=(12V)/(24Omega)=(1)/(2) =0.5 A` |
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| 2422. |
State the Biogenetic law. |
| Answer» Solution :According to BIOGENETIC law, ..ONTOGENY recapitulates Phylogeny... The stages of DEVELOPMENT of the individual ANIMAL repeats the EVOLUTIONARY history of the entire race of the animal. | |
| 2424. |
An electric iron of 1100 W is operated for 2 hours daily. What will be the electrical consumption expenses for that in the month of April? (The electric company charges Rs. 5 per unit of energy). |
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Answer» SOLUTION :Given : Power (P) = 1100 W, Time= 2 hrs Number of days in April = 30 Charges per unit (I kWh) = Rs. 5 To find : MONTHLY Expense Formula: ENERGY = Power x Time Solution : Energy consumed per day =1100 X 2 = 2200 Energy consumed for 30 days = 2200 x 30 = 66000 Wh `=66000/1000=`66 kWh Amount per unit = Rs. 5 Amount for 66 units = 66 x 5 = Rs. 330 [he electrical expenses for the month of April is Rs. 330. |
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| 2425. |
An object of height 2 cm is kept in front of a concave lens of focallength 20 cm. If the object distance is 30 cm, find the position and the height of the image. |
| Answer» SOLUTION : ` V= - 12 cm, h_(2) = 0.8 cm ` | |
| 2426. |
(1) Definemagnetic field . (2) Whatare magnetic fieldlines ? |
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Answer» Solution :(1) Magnetic field : Theregionsurrodinga magnet in which the FORCE of attraction andrepulsiondueto that magneti can be deteced ( usingmagnet or magnetic substance) is calledthemagneticfield . [ Each pointin thisfieldhas a particularstrength. The FIELDAT eachpointalsohas adefinitedirection ]. (2) Magneitc fieldlines alongwhichthe iron filingaling/ arragethemselves due to forceactingon them in themagneticfieldof a bar magnet are calledmagnetic fieldlines. Note: The path followed by THENORTH poleof a COMPASS needlefield , such as thatof a bar magnet , is called a magnetic fieldline . It shows how ,the magnetic force change from pointto point. |
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| 2427. |
How would these advantages differ from the advantages of using a long term perspective in managing our resources? |
| Answer» Solution :If RESOURCES are used in accordance with short term aims, present generation will be able to utilize the resources properly for GROWTH and development , But if we use resources with long term AIM, future generation will also be able to utilize resources for FULFILLING its NEEDS. Thus it would be better to use our natural resources with a long term perspective so that it could be used by the present generation as well as conserved for future use, But it will derive future generation from the benefits of these resources as resources are exhaustible. | |
| 2428. |
The order of various colours observed in the spectrum of sunlight is given below.Choose the correct order. |
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Answer» Blue,VIOLET,GREEN,Red |
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| 2429. |
On the basis of your understanding of the following paragraph and the related studied concepts. Solar power in India is a fast developing industry. The country's solar installed capacity reached 30.071 GW as of 31 July 2019. India has the lowest capital cost per MW to install solar power plants. Solar electricity generation recorded nearly 3.4% of total utility electricity generation in January 2019. The following table shows Annual Solar Power Generation of the last six years. Our country is lucky to receive solar energy for the greater part of the year. It is estimated that during a year India receives the energy equivalent to more than 5000 trillion kW h from the Sun. What are solar cells ? |
| Answer» Solution :Solar cell is a DEVICE that CONVERTS solar energy DIRECTLY into ELECTRICITY. | |
| 2430. |
A uniform seesaw, 5m long, is supported at its centre. A boy weighing 40 kgf sits at a distance of 1 m from the centre of the seesaw. (i) To which class of lever does it belong ? (ii) Find where a girl of weight 20 kgf must sit on the seesaw so as the balance the weight of the boy. |
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Answer» SOLUTION :(i) The seesaw has the fulcrum F at its centre i.e., between the load and the effort. It is a class I lever. (Ii) To BALANCE the weight of the boy, LET the girl be sitting at a distance x METRE from the centre on the opposite side of the boy, then Effort arm=x metre, load arm=1 metre, Taking MOMENTS about F, `40xx1=20xx x` `therefore x=(40)/(20)=2m.` Hence the girl must sit at a distance 2 m from the centre on the opposite side of the boy. |
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| 2431. |
The minimum mass of a fissile material necessary to sustain the chain reaction is called ____________. |
| Answer» SOLUTION :CRITICAL MASS | |
| 2432. |
In a concave lens when an object is between optic centre and infinity , the image will be _________ . |
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Answer» at F |
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| 2433. |
We can see the sun even when it is little below the horizon because of ………………… . |
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Answer» Solution :(i) By sunrise we mean the appearance of he sun above the horizon. (ii) When the Sun is somewhatbelow the horizon, its LIGHT rays are able to reach us alonga curved path due to the refraction through Earth's atmosphere. (iii) Thus we see the Sun EVEN before it emerges above the horizon. (IV) SAMETHING happens at the time of sunset, we keep seeing the Sun for a short while even after it goes below horizon. |
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| 2434. |
Explain the alternatingcurrent (AC). |
Answer» Solution :AC : The current whosedirectionchangesperiodically with timeis calledan alternating current (AC).  Here T (periodictime ) is thetime TAKEN bythe currentto complete one cycle. ITIS thesameas the timetaken by the rotatingcoilin the AC genertorto complete one rotation `f = (1)/(T) ` gives frequency of AC . Itis the sameas the frequencyof rotationof the coil in the AC generator . AC voltageof 220 Vand frequency 50HZ is usedfordomestic purposein India. So , in India , the direction of AC changes100 times in1 second or AC change directionafter every `(1)/(100)`second . A refrigerator ,mixer ,electric iron ,FAN etcworkon AC. |
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| 2435. |
An object 5cm in length is held 25cm away froma converging lens of focal length 10cm. Draw the ray diagram and find the position, size and the nature of the image formed |
Answer» Solution : Height of the Object, `h_0=5cm` Distance of the object from converging lens, u-25cm Focal length of converging lens, f=10cm Using lens FORMULA `1/v-1/u=1/f` `1/v=1/f+1/u=1/(10)-1/(25)=(15)/(250)` `v=(250)/(15)=16.66cm` Also, for a converging lens, `(h_1)/(h_0)=v/u` `h_i=v/uxxh_0(50x5)/(3X(-25))=(10)/(-3)=-3.3cm` Thus, the image is inverted and formed at a distance of 16. 7 cm behind the lensand MEASURES 3.3 cm. The ray DIAGRAM is shown below. |
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| 2436. |
A block of mass 500 g is at rest on a horizontal table. What steady force is required to give the block a velocity of 200"cms"^(-1)" in 4 s ?" |
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Answer» Solution :Use F=ma `a=(v-u)/(t)=(200-0)/(4)=50cm//s^(2)` `F=500 xx 50=25,000"DYNE".` |
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| 2437. |
In coldconutriesin winter , watercarryingpipes sometimesbreak , because _______. |
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Answer» Volumeof waterreducesif the temperatureis reducedbelow `0^(@ )C ` |
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| 2438. |
We wish to obtain an equal sized inverted image of a candle flame on a screen kept at a distance of 4 m from the candle flame. (a) Name the type of lens that should be used. (b) what should be the focal length of the lens and at what distance from the candle flame the lens be placed ? (c) Draw a labelled diagram to show the image formation in this case. |
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Answer» SOLUTION :(a) CONVEX LENS (b) Focal length of the lens should be 2 m. Distance of candle FLAME from the lens is 4 m. 
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| 2439. |
Differentiatemass and weight . |
Answer» SOLUTION :
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| 2440. |
Have you ever seen the persons inebriated with drugs or liquor loitering on dirty places ? Whether such a pitiful condition of most intelligent human being is acceptable ? |
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Answer» Solution :a. A person walking in public PLACES inebriated with drugs or liquor is pitiful sight. b. Both drugs a liquor AFFECT the nervous system (mainly brain) of a person and he loses CONTROL over his actions. c. This not only AFFECTS the person himself but also causes harm and distress to his family and other people in his vicinity. d. Thus, such a condition of a human, the most intelligent LIVING being, is surely not acceptable. |
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| 2441. |
Describe any four safety measures that shouldd be taken while dealing with electric appliances concected in domestic electric circuit. |
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Answer» SOLUTION :To avoid shocks from electrical appliances, use proper-earthing arrangement. (II) Replace old worn out and damaged wires with new set. (iii) PUT the main switch off when removing any FAULT in electric circuits. (iv) Wear rubber shoes and gloves while dealing with replacement of any appliance. (v) Work with electric circuits in proper light. (vi) Do not put your hand INSIDE water being heated with immersion rod, when the rod is inside and on. |
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| 2442. |
Dharmendra is a welder , workingat Amit.s house. Afterelectricweldingdone with nakedeyes , heused a grinderto smoothen the weldingjoints . Accidentally, some particle fell into his eye . He was then cryingdue to pain . Amittook him to an eye hosptialby a taxi. Amittook him to an eye hospital by a taxi . Thedoctorused a device connected to two electricwiresto removethe particlefrom his eye . Dharmendra inquired what happened to his eye and what device did the doctoruse to removethe particlefrom his eye . Amit as a science students of class X explained toDharmendra and adivsed him to be carefull in future as he had a responsiblerisky job of welding . Whatvaluedo you learn from Amitduring this episode ? |
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Answer» SOLUTION :We LEARN the valuesuch as . (a) Will tohelp OTHERS. (B) abilityto handlea scrioussituation with CALMNESS. |
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| 2443. |
Give the names of two ener8y sources that you would consider to be exhaustible. Give reasons for your choices. |
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Answer» Solution :Two exhaustible energy SOURCES are: (a) Coal: It is produced from dead remains of plants and animals that remain BURIED under the earth.s crust for millions of years. It takes millions of years to PRODUCE coal. Industrializationhas increased the demand ol coal.However, coal cannot replenish within a short TIME. Hence, it is a non-renewable or exhaustible energy source. (b) Wood: It is obtained from forests. Deforestation at a faster rate has caused a reduction in the number of forests on the earth. t takes hundreds of years to grow a forest. If deforestation is continued at this rate, there would be no wood left on the earth. Hence, wood is an exhaustible energy source. |
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| 2444. |
Dharmendra is a welder , workingat Amit.s house. Afterelectricweldingdone with nakedeyes , heused a grinderto smoothen the weldingjoints . Accidentally, some particle fell into his eye . He was then cryingdue to pain . Amittook him to an eye hosptialby a taxi. Amittook him to an eye hospital by a taxi . Thedoctorused a device connected to two electricwiresto removethe particlefrom his eye . Dharmendra inquired what happened to his eye and what device did the doctoruse to removethe particlefrom his eye . Amit as a science students of class X explained toDharmendra and adivsed him to be carefull in future as he had a responsiblerisky job of welding . Whatdevicewas used by the doctorto removethe partcile ? |
| Answer» SOLUTION :Thedoctorused an electromagneticto REMOVE the tinyiron PARTICLE . | |
| 2445. |
Dharmendra is a welder , workingat Amit.s house. Afterelectricweldingdone with nakedeyes , heused a grinderto smoothen the weldingjoints . Accidentally, some particle fell into his eye . He was then cryingdue to pain . Amittook him to an eye hosptialby a taxi. Amittook him to an eye hospital by a taxi . Thedoctorused a device connected to two electricwiresto removethe particlefrom his eye . Dharmendra inquired what happened to his eye and what device did the doctoruse to removethe particlefrom his eye . Amit as a science students of class X explained toDharmendra and adivsed him to be carefull in future as he had a responsiblerisky job of welding . Whichparticlefell into Dharmendra.s eyewhile welding ? Whatprecautions should Dharmendratake whiledoingelectric weldingand grinding work ? |
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Answer» Solution :A tiny IRON particlefell into DHARMENDRA.s eye while welding . Dharmendra should use some eye - protectingdevice e.g.,weldinggoggles or handheld SHIELD while doing electric weldingand grinding WORK . |
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| 2446. |
Draw a labelled circuit diagram to study the relationship between the cunent (I) flowing through a conductor and the potential difference (V) applied acro its two ends. State the formula conelatlng the I in a conductor and the V acroa it. Also show their relationship by drawing a diagram. What would be the resistance of a resistor if the current flowing through it is 0.15 A when the potential difference across it is 1.05 V ? |
Answer» Solution : The formula STATES that the current passing through a conductor is directly proportional to the POTENTIAL difference across its ends, PROVIDED the physical CONDITIONS LIKE temperature, density, etc. remain unchanged . This is Ohm.slaw `I prop V or I =(V)/(R)` `V= pm IR `. R is called resistance of the conductor As V= 1.05 V I = 0.15 A V =IR `1.05 =0.15 xxR ` `R =(1.05)/(0.15) = 7 Omega` |
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| 2447. |
Ohm's law states the relationship between power and voltage. |
| Answer» Solution :CORRECT STATEMENT : Ohm.s law states the relationship between potential DIFFERENCE and CURRENT. | |
| 2448. |
The maximum resistance which can be made using four resistors each of 2 Omega is |
| Answer» Solution :8 `Omega` | |
| 2449. |
In gamma-decay................ |
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Answer» atomic number DECREASES by ONE |
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| 2450. |
The gravitational field intensity at a point 10,000km from the centre of the earth is 4.8Nkg^(-1). The gravitational potential at that point is |
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Answer» Solution :Gravitational intensity `=E= (GM)/(R^2)` Gravitational potential `V= -(GM)/(R )` `(V)/(E )= -R` or `V= -ExxR` or `V= -4.8xx10,000xx10^(3)= -4.8xx10^(7)J KG^(-1)`. |
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