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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.
| 2351. |
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. How much voltage can be developed and how much electricity can be produced by one typical-solar cell when exposed to the Sun ? |
| Answer» Solution :One typical solar cell can develop a VOLTAGE of 0.5 to 1 VOLT and can PRODUCE about 0.7 watt of ELECTRICITY. | |
| 2352. |
List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining image of a distant object on a screen. |
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Answer» Solution :The precaution while DETERMINING the focel length of a given convex lens by obtaining image of a distant object on a screen are: (i) A convex lens should be PLACED on the lens holder kept on a optical BENCH at a point 'A'. (ii) The position of the screen is adjusted on the other side of the lens in such a way that a clear and SHARP image of the object is formed on it. (iii) The base of the lens and white screen should be in a line with the measuring scale. (iv) There should not be any obstacle in the path of the convex lens. |
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| 2353. |
Draw a ray diagram showingthe path of rays of light when it enters with oblique incidence from water into air |
Answer» SOLUTION :From WATER into AIR 
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| 2354. |
Whatare thefactors on whichthe forceactingon a givecurrent- carryingconductorplaced in a magneticfield depend ? State when is the magnitudeof force highest . |
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Answer» Solution :Force on the givenconductor ( and hencethe displacmentof the conductor) depends upon : (1) directionof current and . (2) directionof magnetic FIELD . Experiments haveshown that the MAGNITUDEOF theforce is thehighest( or thedisplacement of the rodis LARGEST) when the directionof current is at right angle to the DIRECTION of the magnetic field . |
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| 2355. |
In a hydroelectric power plant, |
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Answer» POTENTIAL energy possessed by stored WATER is CONVERTED into electricity. |
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| 2356. |
SI unit of temperature is ____________. |
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Answer» celsius |
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| 2357. |
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. List two advantages of solar cells. |
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Answer» Solution :Two advantages of solar cells are : (i) They have no moving parts and REQUIRE little MAINTENANCE. (II) They can be SET up EVEN in remote areas. |
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| 2358. |
Assertion:Among alpha, beta and gamma rays, alpha-particle has maximum penetrating power. Reason: The alpha-particle is heavier than beta & gamma rays |
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Answer» If both the ASSERTION and the reason are true and the reason is the correct explanation of the assertion. |
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| 2359. |
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. The future of power generation by solar energy is bright in India. Give reason. |
| Answer» Solution :Future of power generation by solar energy is bright in India because India has an extremely large electricity generation CAPACITY by using solar energy and India has the lowest CAPITAL cost per MW to INSTALL solar power PLANTS. | |
| 2360. |
Other than thermal power plant, which power plants use thermal energy for power generation? In what different ways is the thermal energy obtained? |
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Answer» Solution :(1) The power plant based on NATURAL gas and the nuclear poer plants also used thermal energy for the power generation. APART from these, SOLAR energy is also used to produce heat and thereby create the power. (2) In nuclear power plant the energy is RELEASED by carrying out fission of nuclei of atoms like Uranium or Plutonium. This energy is used to generate the stesm of high temperature and high pressure. The steam rotates the turbine. The kinetic energy in steam drived the turbine and turbine in turn drived the generator. (3) The combustion of natural gas PRODUCES gas, which is used to run the turbine. This gas is under high pressure and high temperature. This is used to produce thermal energy. (4) In solar thermal power plant, thermal energy is generated with the help of solar radiation. For this reflectors and absorbers are used for concentrating solat radiation and converting it into thermal energy. |
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| 2361. |
One day the science teacher was teaching in her class, one of her student seemed very sad. The teacher asked her the reason. She told the teacher that a mishap took place in her locality where four members of a family died as they were trying to steal electricity by connecting a conductingwire with the live wire on the street. Answer the following questions based on the situation given above. (i) Do you think this practice of electricity theft is good? (ii) What advice would you like to give to improve such mind-set? |
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Answer» Solution :(i) No, electricity theft is not good. (ii) PROPER connection, billing, safety measure can SAVE both property and life which is more precious. People should BECOME responsible citizens and should not HP involved in any unlawful and risky EVENTS like electric theft, etc. |
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| 2362. |
Explain with diagram step-by-step energy conversion in: Hydroelectric power plant : |
Answer» Solution : In HYDROELECTRIC PLANT, the water stored in the reservoir is used as a source of POTENTIAL energy. This water is made to FALL at a great speed and hence there is production of kinetic energy in flowing water. This FAST flowing water falling down from the reservoir is brought to the turbine at the lower levels. The kinetic energy of the flowing water in turn drives the turbine. The turbine then drives the generator and electrical energy is produced. |
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| 2363. |
Which of the following is not an example of a biomass energy source ? |
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Answer» Wood |
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| 2364. |
The following apparatus is available in a laboratory : Battery : adjustable from 0 to 4.5 V Resistors : 3 Omega and 6 Omega Ammeters : A_1 of range 0 to 3 A , least count 0.1 A A_2 of range 0 to 1 A, least count 0.05 A Voltmeters : V_1 of range 0 to 10 V , least count 0.5 V V_2 of range 0 to 5 V , least count 0.1 V Which is the best combination of votmeter and ammeter for finding the equivalent resistance of the resistors in series ? |
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Answer» AMMETER `A_(1)` and voltmeter `V_(1)` |
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| 2365. |
Two particles having the same phase must be at |
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Answer» one CREST and one trough |
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| 2366. |
A gas which obeys the relation PV = nRT at all temperature and pressure is called real gas. |
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| 2367. |
Direction of current produced by dynamo is governed by : |
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| 2368. |
Which of the following oxides of iron would be obtained on prolonged reaction of iron with steam ? |
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Answer» FeO |
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| 2369. |
Find the equivalent resistance of a device which draw 2A of current at 12V. |
| Answer» SOLUTION :`6OMEGA` | |
| 2370. |
Differentiate between a microscope and telescope on its use. |
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Answer» Solution :A microscope is an optical instrument which is used to see FINER details of OBJECTS A telescope is used for VIEWING DISTANT objects clearly |
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| 2371. |
List in a tabular form two differences between a voltmeter and an ammeter. |
Answer» SOLUTION :
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| 2373. |
An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained ? Find the size and the nature of the image. |
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Answer» Solution :u = -27 CM, F = -18 cm (As the mirror is concave), h = 7.0 cm From mirror formula `(1)/(v) + (1)/(u) = (1)/(f) rArr (1)/(v) + (1)/((-27)) = (1)/((-18)) rArr (1)/(v) = - (1)/(18) + (1)/(27) = (-3 + 2)/(54) = (-1)/(54)` or v = - 54 cm. The screen MUST be placed at a distance of 54 cm from the mirror in front of it. `m = - (v)/(u) = -(-54)/(-27) = -2`. The image is real, inverted and enlarged. Size of the image h. = m.h `= (-2) xx 7` cm = - 14 cm. Thus, the image is of 14 cm length and is an inverted image i.e., formed below the PRINCIPAL AXIS. |
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| 2374. |
ln the given circuit, calculate : (i) the total resistance of the circuit (ii) the current through the circuit, and (iii) the potential difference across R_(1) and R_(2) |
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Answer» Solution :Given, the resistance of conductor `R_(1) = 4Omega` The resistance of conductor `R_(2) = 20Omega` (i) The total resistance of the circuit R= `R_(1) + R_(2)`(series COMBINATION) (i) Now by Ohm.s Law The current through the circuit `V=IRI= (V)/(R) = (6)/(24) = (1)/(4) =0.25 ` Amp. (iii) The potential difference across the TWO TERMINALS of the battery = 6 V . `V_(1)= IxxR_(1)` = `0.25xx4= 1V` ( Potential difference across the conductor `R_(1))` `V_(2) =IxxR_(2)` = `0.25xx20= 5V` ( Potential difference across the conductor `R_(2))` |
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| 2375. |
A couple shall have a male child or female child totally depends upon husband. Prove truthfulness of this statement with scientific reason. |
Answer» Solution :(1) The statement gender of child is determined by the male partner of COUPLE is true.  (2) It is CLEARLY SEEN from the diagram that there are two types of sperms produced by MALES. One sperm has a X chromosome while the other has a Y chromosome, apart from autosomes. The mother on the other hand has all X bearing oocytes. Thus the sperm that FERTILIZES the oocyte decides the sex of the child. (3) If X bearing sperm fertilizes the oocyte, daughter is born and when Y bearing sperm fertilizes the oocyte, son is born. (4) Thus father or male partner is responsible for the determination of the sex. |
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| 2376. |
Calculate the force required to move a train of 2000 quintal up on an incline plane of 1 in 50 with an acceleration of 2"ms"^(-2). The force of friction per quintal is 0.5 N. |
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Answer» Solution :Force of friction =0.5N per qunital `f=0.5 xx 2000=1000N` `m=2000" QUINTALS"=2000 xx 100 kg` `sin THETA=1/50, a=2m//s^(2)` In MOVING up an inclined plane, force required against GRAVITY `=MG sin theta= 39200N` And force required to produce acceleration `=ma = 2000 xx 100 xx 2= 40,0000 N` Total force required =1000 + 39,200 + 40,0000 `=440200 N.` |
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| 2379. |
Mention the frequency of AC supply in India. |
| Answer» Solution :Frequency of alternating CURRENT in India is 50 HZ. | |
| 2380. |
The efficiency of power generation using coal plant is higher than that of power generation plant based on natural gas. True/False |
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| 2381. |
An object in a denser medium when viewed from a rarer medium appears to be raised. The shift is maximum for : |
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Answer» RED light |
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| 2382. |
The phenomenon of electromagnetic enduction is: |
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Answer» The PROCESS of charging a body. |
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| 2383. |
Any object on earth falls vartically downward and not at an angle to the vertical, nor fly off in a horizontal direction . |
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Answer» Solution :(i) The force with which earth ATTRACTS any OBJECT is directed TOWARDS the centre of the earth. (ii)At any given position of a falling object, the direction from the falling object to the centre FO the earth is vertically downward. Hence, any object on earth will fall vertically downward and not at an angle to the VERTICAL , nor will the object fly off in a horizontal direction . |
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| 2384. |
Find the direction of magnetic field due to a current-carrying circular coil held : [i] Vertically in north-south plane and an observer looking at it formeast sees the current to flow in an anticlockwise direction[ii]Vertically in east-west plane and an observer looking it from south sees the current to flow in an anticlockwise direction .[iii] Horizontally and an observer looking at it from below sees current to flow in the clockwise direction. |
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Answer» Solution :i] The magnetic field is from EAST to WEST direction. II] The magnetic field is from south to northdirection. iii] The direction of the field for theobserver POSITIONED belowthe coil is downward. |
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| 2385. |
How does an eye focus the object lying at various distances? |
| Answer» Solution :The eye can focus the images of the distant objects as WELL as that of the nearby objects on its retina by changing the focal length of its LENS. The focal length of the eye lens is CHANGED by the action of the ciliary muscles. The ciliary muscles can change the thickness of the eye lens and HENCE its focal length CHANGES the converging power of the eye lens. | |
| 2386. |
What is an electric fuse? Explain itsfabrication. function and use in electric circuit in detail. |
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Answer» Solution :An electric fuse is a low resistance resistor Wire having low melting point that providesprotection in the event of a overload current. The fuse is placed on live Wire in series With the device (and With the mains supply). The fuse is a safety device used in electriccircuits which protects circuits and appliances by stopping the flow of any unduly high electric current. If CONSISTS of a piece of wire made of a metal or an alloy of approprlate melting point e.g., aluminium, copper,iron,lead,etc. If a current higher than the specified valueflows through the circuit, the temperature of the fuse Wire increases. This MELTS the fuseWire and breaks the circuit, due to whichcurrent stops FLOWING. The fuse used to protect an individual electrical device is shown in figure.  The fuse connected in series with the mains supply is generally encased in cartridge of porcelain or similar material with metal ends. The fuses used for domestic purposes are rated as 1 A, 2 A, 3 A, 5 A, 10A, etc. For an electric iron which consumes 1 kW electric power when operated at 220 V. a current of `I=P/V =1000/220= 4.54 A`flows in the circuit. In this case, a fuse of rating 5 A should be used. |
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| 2387. |
The depletion of the ozone layer causes |
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Answer» GLOBAL warming |
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| 2388. |
The valueof acceleration due to gravityon the surface of the moon is 3.625 ms^(-2) . |
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Answer» |
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| 2389. |
The gravitational force between two bodies in 1 N if the distance between them is doubled, what will be the force between them? |
| Answer» SOLUTION :`F=1F' = (F)/(4)=(1)/(4)N`. | |
| 2390. |
whattypeof reactionis thetransformationof ethanolintoethanoic acid ? |
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Answer» ADDITIONREACTION |
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| 2391. |
A rollercoasterexhibitsthe phenomenonof ___________ |
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Answer» LINEARMOMENTUM |
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| 2392. |
Explain the mechanism of cleansing actionof soaps and detergents. |
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Answer» Solution :A soap molecule contains two chemically distinct parts that interact differently with water. It has one POLAR end, which is a short head with a carboxylate GROUP (-COONa) and one nonpolarand having the long tail made of the hydrocarbon chain. The polar end is hydrophilic (Water loving) in NATURE and this end is attracted towards water. The non-polar end is HYDROPHOBIC (Water hating) in nature and it is attracted towards dirt or oil on the cloth, but not attracted towards water. thus, the hydrophobic part of the soap molecule traps the dirst and the hydrophilic part makes the entire molecule soluble in water. When a soap or detergent is dissolved in water, the molecules join together as clusters called .MICELLES.. their long hydrocarbon chains attach themselves to the oil and dirst. the dirt is thus surrounded by the non-polar end of the soap molecules. the charged carboxylate end of the soap molecules makes the micelles soluble in water. thus, the dirt is washed away with the soap. |
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| 2393. |
How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain. |
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Answer» Solution :A solenoid has a large number of close,insulated circular turns. The magnet at the centre of current CARRYING circular wire is along the axis, so when current is passed in a solenoid, the magnetic fields due to all circular turns are added and hence the field line becomes just as for a bar magnet. YES, we can determine the northand south poles of a current carrying solenoid with the help of a bar magnet. For this we suspend the bar magnet freely and note its ends pointing along north and south directions and MARK on these ends N (north pole) and S (south pole). Now we bring N-pole near one END of freely SUSPENDED current carrying solenoid, if there is repulsion, then that end of solenoid is N-pole and other S-pole, butif there is attraction, then that end of solenoid is S-pole and the other is N-pole. |
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| 2394. |
Which of the following have inert gases 2 electrons in the outermost shell? |
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Answer» He |
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| 2395. |
What is iris? |
| Answer» Solution :IRIS is a dark MUSCULAR DIAPHRAGM present behind the cornes of the human eye that controls the size of the PUPIL. | |
| 2396. |
Judge the equivalent resistance when the following are connected in parallel: a) 1 Omega and 10^6 Omega (b) 1 Omega and 10^3 Omega and 10^6 Omega |
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Answer» SOLUTION :When two or more resistances `R_1,R_2,R_3` etc are joined in PARALLEL, the resultant RESISTANCE in parallel arrangement `R_p` is given by `1/R_p=1/R_1+1/R_2+1/R_3+…` (a) When `R_1=1 Omega and R_2=10^6 Omega` `1/R_p=1/1+1/10^6=1+10^-6=1 IMPLIES R_p=1 Omega` (b) When `R_1=1 Omega, R_2=10^3 Omega and R_3=10^6 Omega` `1/R_p=1/1+1/10^3+1/10^6=1+10^-3+10^-6=1thereforeR_p=1 Omega` |
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| 2397. |
A satellite takes 24 hours to complete one revolution around a planet 2 times heavier and of the same size as that of earth. Detemine the height of the orbit of the satellite from the surface of the planet. |
| Answer» SOLUTION :`46909"KM" or 46.909xx10^(6)m` | |
| 2398. |
Derive the ideal gas equation. |
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Answer» Solution :(i) The ideal gas EQUATION relates all the properties of an ideal gas. (ii) AL ideal gas obeys BOYLE's law, Charle's law and Avagardo's law. (iii) According to Bolye's law. PV = constant....(1) (iv) According to Charle's law, V/T = constant...(2) According to Avagardo's law, V/n = constant...(3) Conbining equations (1),(2) and (3) , we can write, PV/nT = constant...(4) This relation is called the combined law of gases. (vii) CONSIDER, `n=muN_(A)` (viii) Using this value, equation (4) can be written as `PV//muN_(A)T` = constant (ix) The value of constant in the above equation is taken to be `K_(B)`, which is called as Boltzman constant. Its value is `1.381 xx10^(-23) JK^(-1)`. (x) Hence, we have the FOLLOWING equation: `PV//muN_(A)T =K_(B)` `PV = muN_(A) K_(B) T` Here, `muN_(A) K_(B) = R` , which is universal gas constant and its value is `8.31 J mol^(-1) K^(-1)` PV=RT This is called ideal gas equation . Ideal gas equation is also called as equation of state. |
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| 2399. |
A person gets a severe electric shock on touching ............ . |
| Answer» Answer :A | |
| 2400. |
How is the kinetic energy of a moving cart affected if (a) its mass is doubled, (b)its velocity is reduced to (1)/(3)rd of the initial velocity ? |
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Answer» Solution :(a)`K_(1)=(1)/(2)mv^(2).K_(2)=(1)/(2)xx2mxxv^(2)` `therefore K_(2)=2K_(1)` Alternative :If mass m is doubled (keeping the SPEED same),the kinetic energy gets doubled (since kinetic energy is directly proportional to the mass) i.e., Increase in kinetic energy =`K_(2)-K_(1)=2K_(1)-K_(1)` `=K_(1)` (initial kinetic energy ) (b)`K_(1)=(1)/(2)mv^(2),k_(2)=(1)/(2)mxx((1)/(3)v)^(2)=(1)/(9)xx(1)/(2)mv^(2)` `therefore K_(2)=(1)/(9)K_(1)` ALternative :If VELOCITY v is reduced to `(1)/(3)`rd (keeping the mass same),the kinetic energy reduces to `(1)/(9)TH` initial value (since kinetic energy is directly proportional to the square of velocity). i.e. Decreases in kinetic energy =`K_(1)-K_(2)=K_(1)-(1)/(9)K_(1)` `=(8)/(9)K_(1)` (i.e. `(8)/(9)th` the initial kinetic energy ) |
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