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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.
| 7451. |
Refractive index in diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of diamond. |
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Answer» Solution :`mu_(g)=mu_("glass")=1.5 mu_(d)=mu_("DIAMOND")=?` `mu_(dg)=(V_(g))/(V_(d))=1.6` But `mu_(g)=(c )/(V_(g))` `1.5=(3XX10^(8))/(V_(g))"" V_(g)=(3xx10^(8))/(1.5)` Also, `mu_(dg)=(V_(g))/(V_(d))=1.6 "" 1.6=(3xx10^(8))/(1.5)div V_(d) "" V_(d)=(3xx10^(8))/(1.5xx1.6)` `mu_(d)=(c )/(V_(d))=3xx10^(6)=(3xx10^(8))/(1.5xx1.6)` The ABSOLUTE refractive index of diamond is 2.4 |
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| 7452. |
On which principle does a prism form the image of an object? |
| Answer» SOLUTION :REFRACTION of LIGHT. | |
| 7453. |
On which effect of an electric current does a fuse work ? |
| Answer» SOLUTION :The FUSE works on the heating effect of an ELECTRIC CURRENT. | |
| 7454. |
The speed of a body describing its motion is |
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Answer» direction |
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| 7455. |
What kind of mirror-concave, convex or plain would be best suited for use in a solar cooker ? Why ? |
| Answer» Solution :Concave MIRROR is BEST SUITED for use in a solar cooker. This is because it is a converging mirror and converges large AMOUNT of light of sun into the solar cooker. | |
| 7456. |
For the circuit shown in figure given below, calculate (a) the total resistance of the circuit. (b) the total current flowing in the circuit. (c) the voltage developed across the two ends of R_1. |
| Answer» Solution :(a) `12 OMEGA` (B) `0.5 A`(C ) 3.6 V | |
| 7457. |
A ball of mass 1 kg moving with a speed of 10 ms^(-1) reboundsafter a pefect elastic collision with the floor. Calculate the changein linear momentum of the ball. |
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Answer» Solution :u=-20 cm f=10 cm `1/(f)=1/v-1/u` `1/v=1/(f)+1/u` `1/v=1/10+1/(-20)` `1/v=1/10-1/20` `v=1/20 rArr` v=20 cm Nature of the image REAL enlarged and inverted image. (II)Given : mass =1 kg , speed = `10 ms^(-1)` `therefore` INITIAL momentum = mu = 1 x 10 =10 kg `ms^(-1)` Final momentum = mv =- 10 `ms^(-1)` Change in momentum =final momentum - Initial momentum =mv-mu =-10-10 Change in momentum =-20 kg `ms^(-1)` 
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| 7459. |
Name the part of our eyes that helps us to focus near and distant objects in quick sucession. |
| Answer» SOLUTION :Ciliary MUSCLES HOLDING the EYE LENS. | |
| 7461. |
Explain with diagram step-by-step energy conversion inThermal power plant |
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Answer» Solution :In a thermal power PLANT coal is used as fuel. b. Conversion of chemical energy in coal to thermal enrgy:When the coal is burned, the chemical energy in coal is converted to thermal energy . c. conversion of thrmal energy to kinetic energy in steam :This thermal energy is used to heat the water present in a boiler . Steam of very high temperature and pressure is GENERATED and directed on the blandes of the turbine . d.Conversion of kinetic energy in steam to kinetic energyin turbine:The kinetic energy produced in THESTEAM is then used to DRIVE the turbine. e. Conversion of kinetic enrgy in turbine to electrical energy:The turbine rotates the generator connected to it which in turn PRODUCES electrical energy. 
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| 7462. |
Edible oil, LPG, CNG, crude oil. |
| Answer» Solution :Edible OIL: It is used in FOOD products, while OTHERS are used as FOSSIL FUELS. | |
| 7464. |
Momentum of a body is doubled. By what percent does its KE change? |
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Answer» Solution :K.E. `=(p^(2))/(2m)` when p is DOUBLED K.E. becomes 4 times. `:.` % Increase in K.E. `=(DeltaK.E.)/(K.E)XX100=(4K.E-K.E.)/(K.E.)xx100` `=3xx100=300%` |
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| 7465. |
What is the function of ostia and osculum in Poriferan animals . |
| Answer» Solution :Water is TAKEN through the OSTIA and GIVEN out through the osculum in CASE of PORIFERANS while feeding . | |
| 7466. |
Enumeratethefunctionofblood. |
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Answer» Solution :Functions of blood. (i) TRANSPORT of repiratory gases (Oxygen and `CO_(2)`). (ii) Transport of digested food materials to the different body cells. (iii) Transport of hormones. (iv) Transport of nitrogenous excretory products like ammonia, urea and uric acid. (V) It is involved in protection of the body and defensee against diseases. (vi) It ACTS as buffer and also HELPS in regulation of pH and body temperature. |
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| 7467. |
What is meant by free path of a gas molecule ? On what factors does the mean free path depend ? |
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Answer» SOLUTION :`(i)` DIAMETER of molecule as `lambda PROP (1)/(d^(2))` `(ii)` PRESSURE of gas as `lambda prop (1)/(P)` |
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| 7468. |
What will be the nature of a spherical mirror and a thin spherical lens if both have negative focal length ? |
| Answer» SOLUTION :CONCAVE. | |
| 7469. |
Vagina: |
| Answer» SOLUTION :Passage for copulation/intercourse. BIRTH canal. Passage for MENSTRUAL FLOW. | |
| 7470. |
______group contains the members of halogen family . |
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Answer» 17th |
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| 7471. |
The number of significant figures in 0.06900 is |
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Answer» 5 |
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| 7472. |
Differentiate mass and weight. |
Answer» SOLUTION :
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| 7473. |
What changes would you suggest in your home in order to be environment frindly? |
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Answer» Solution :By pursuing the three R.s,i.e., Reduce , Recycle and Reuse , we can save the ENVIRONMENT in an effective way . (i)Reduce : It means to use less . I would save electricity by switching offunnecessary lights and fans , preper walking on CYCLING than using an AUTOMOBILE , TURN off the engine of car at red light , repair leaky taps , and would not waste food etc. (ii)Recycle : Meansto collect used things like palastic , paper , glass and metal items and recycle these materials to make required thingsinstead of synthesising or extracting fresh plastic, paper , glass or metal . (iii)Reuse : Refers to use things again and again . For example , instead of throwing away used envelopes , they can be used by reversing . |
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| 7474. |
One horse power is |
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Answer» 764 watt |
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| 7475. |
A ball is dropped from height h on the ground where co-efficient of restitution is e. After one bounce the maximum height is |
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Answer» `e^(2)H` If the bal re bounces with velocity V, then `V=eu=esqrt(2gh)` If `h'to` MAX velocity ofter one bounce, then `0^(2)-V^(2)=2(-g)himpliesh'=e^(2)h` |
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| 7476. |
Appliances based on heating effect of current work on |
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Answer» only a.c. |
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| 7477. |
Rahul adds aqueous solution of barium chloride to an aqueous solution of sodium sulphate. What would he observe? |
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Answer» Solution :He WOULD observe that a white precipitate is FORMED almost immediately. This is because when aqueous solution of barium chloride is added to an AQUEOS solution of sodium sulphate, barium sulphate and sodium chloride are formed. `BaCl_(2)+Na_(2)SO_(4)toBaSO_(4)+underset(("White ""ppt")(2NaCl)` |
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| 7478. |
How is mechanical advantage related to velocity ratio for (i) an ideal machine, (ii) a practical machine ? |
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Answer» |
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| 7479. |
Assertion : Cristae increases the inner surface area of mitochondria. Reason : Cristae involve in ATP synthesis. |
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Answer» OXYSOMES |
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| 7480. |
An electric lamp of 100 Omega, a toaster of resistance 50 Omega and a water filter of resistance 500 Omega are connected in parallel to a 220V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it? |
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Answer» Solution :Here voltage of given voltage SOURCE V=220V As three gadgets of resistances `R_1=100 OMEGA,R_2=50 Omega and R_3=500 Omega` have been connected to parallel across the voltage source, hence their EQUIVALENT resistance `R_p` is given by `1/R_p=1/R_1+1/R_2+1/R_3=1/100+1/50+1/500=(5+10+1)/500=16/500` `R_p=500/16 Omega =31.25 Omega` `therefore` Resistances of electric iron, which draws as much current as all three appliances (lamp, toaster and WATER filter) taken together =`R=R_p=31.25 Omega` Current passing through electric iron `I=V/R=(220V)/(31.25 Omega)=7.04 A` |
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| 7481. |
Dimensions of angular momentum are |
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Answer» `[MLT^(-2)]` |
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| 7482. |
Temperature of air is 40^@C:49 grams of water vapour : :Temperature of air is 20^@ C : ______ |
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Answer» |
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| 7484. |
(a) Draw a ray diagram to show the formation of image of an object placed between infinity and optical centre of a concave lens. (b) A concave lens of focal length 15 cm forms an image 10 cm from the lens. Calculate (i) the object distance, (ii) the nature and magnification of the image formed. |
Answer» Solution :(a) A ray diagram showing the FORMATION of image of an object placed between infinity and optical CENTRE of a concave lens is shown below.  (b) Here f = - 15 cm, v = - 10 cm (i) From lens FORMULA `(1)/(v) - (1)/(u) = (1)/(f)`, we have `(1)/(u) = (1)/(v) - (1)/(f) = (1)/((-10)) - (1)/((-15)) = - (1)/(10) + (1)/(15) = - (1)/(30)` `rArr""u = - 30` cm THUS, the object is placed at a distance of 30 cm from the concave lens and the image is a virtual image. (ii) Magnification `m = (v)/(u) = ((-10))/((-30)) = (1)/(3) = 0.33` |
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| 7485. |
A boy of mass m climbs up the stairs of vertical height h. (a) What is the work done by the boy against the force of gravity ? (b) What would have been the work done if he uses a lift in climbing the same vertical height ? |
| Answer» SOLUTION :(a) MGH, (B) mgh | |
| 7486. |
(i) What is the mass of 1 mole of nitrogen atom? (ii) How many moles of SO_(2) have same mass as 3 moles of oxygen? (iii) How many molecules are present in 1 ml of water? |
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Answer» Solution :(i) 1 `times` gram atomic mass of nitrogen ATOM `""1 times 14=14g` (ii) Mass of 3 moles of oxygen `=3 times 16=48g` `""`, Now, mass of `SO_(2)=32+[2 times 16]` `""=32+32=64g` `""therefore" 64 g of "SO_(2)=` 1 MOLE `"48 g " SO_(2)=(1/64) times 48=0.75` mole (iii) We KNOW that density of water is 1 g/ml Hence, 1 g of water = 1 ml of water Now, We have molecular mass of water `""H_(2)O=(1 times 2)+16=18g` 18 g of water contains `6.022 times 10^(23)` molecules 1 g of water will contains `=(6.023 times 10^(23))/18=0.33 times 10^(23)` molecules So the number of molecules of water in 1 ml `=3.3 times 10^(22)` |
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| 7487. |
(a) Draw a ray diagram to explain the term angle of deviation. (b) Wgy do the component colours of incident white light cplit into a spectrum whilepassing through a glass prism, explain. (c) Draw a labelled ray diagram to show the formation of a rainbow. |
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Answer» Solution :(a) Angle of deviation is the angle between extended incident ray and extendent emergent ray through a PRISM. PQ = Incident Ray, RS = Energy Ray `angle D=` Angle of Deviation  (B) The incident white light splits into a SEVEN coloured spectrum as speed of different coloured light waves is different when these pass through the prism. (C) 
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| 7488. |
How the disease are transmited from one person to the other person? |
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Answer» Solution :All INFORMATION from the environment are detected by the receptors, located in the sense organs such as the eyes, nose, skin, ETC. Information from the receptors is transmitted as electrical impulse and is received by the dendritic tips of the neuron. This impulse travels from the dendrite to the cell body and then along the AXON to its terminal end. On reaching the axonal end, it causes the nerve endings to release a chemical (neurotransmitter) which diffuses across a synapse and starts a similar electrical impulse in the dendrites of the NEXT neuron, then to their cell body to be carried along the axon. In this way, the electrical signal reaches the brain or spinal cord. The response from brain (or spinal cord) is similarly passed on to the effector organs such as the muscle or gland cell, that undergoes the desired response. The flow of nerve impulses from axon end of one neuron to dendrite of another neuron through a synapse is called synapatic transmission. |
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| 7489. |
How much current will an electric bulb draw from a 220 V source, if the resistance of the bulb filament is 1200 Omega? |
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Answer» Solution :We are given. source voltage V = 220 V, RESISTANCE of bulb FILAMENT R = 1200 `Omega`. Now, V= IR `I = V/R = 220V//1200 Omega = 0.18A` |
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| 7490. |
What is the Cartesian sign convention used for spherical mirrors ? |
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Answer» Solution :i. The pole of the mirror is CONSIDERED as ORIGIN and all the distances are measured from the pole. ii. Principal axis is TAKEN as X-axis and all the distances PARALLEL to the principal axis are measured from the pole of the mirror. iii. The object is always kept on the left of the mirror. iv. All the distances measured to the right of the origin (in the same direction of the incident ray) are taken as positive, while those measured to the left side of the origin are taken as negative. Thus, the focal length of a CONCAVE mirror is negative while that of a convex mirror is positive. v. All the distances measured vertically upwards from the principal axis are taken as positive and those measured in vertically downward direction, are taken as negative. |
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| 7491. |
The induced current in the electrical conductor ( coiI) will be maximum when the direction of motion of the electric conductor is ............ to the magnetic field |
| Answer» SOLUTION :PERPENDICULAR | |
| 7492. |
The length of a rod as measured in an experiment is found to be 2.48 m, 2.46 m , 2.49 m , 2.49 m and 2.46 m. Find the average length , the absolute error in each observation and the percentage error. |
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Answer» SOLUTION :AVERAGE length `=(2.48+2.46+2.49+2.50+2.48)/(5)=(12.41)/(5)=2.48m` Mean absolute ERROR `=(0.00+0.02+0.01+0.02+0.00)/(5)=(0.05)/(5)=0.013m` PERCENTAGE error = `(0.01)/(2.48) × 100% = 0.04 × 100%` `= 0.40%` Correct length = `(2.48 ± 0.01)m` Correct length = `(2.48m ± 0.40%)` |
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| 7493. |
Name the following:(i) Metal that can be cut by knife(ii) Lustrous non-metal(iii) Metal that exists in liquid state at room temperature(iv) Most malleable and ductile metal(v) Metal that is best conductor of electricity(vi) Non-metal that can exist in different forms(b) How are alloys better than metals ? Give composition of solder and amalgam. |
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Answer» Solution : (i) Sodium (Na) (II) Iodine (`I_2`) (III) Mercury (Hg) (iv) Gold (Au) (v) Silver (Ag) (vi) Carbon (C) (b) We can get DESIRED PROPERTIES from a metal by alloying it with another metal or non-metal. For example, iron is very soft. But if it is mixed with about 0.05% carbon, it becomes hard and strong. Solder : Lead and tin. Amalgam : Metal and mercury. |
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| 7494. |
(a) Define an ecosystem. Give examples of any two ecosystems. (b) List the biotic and abiotic components of an ecosystem. |
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Answer» SOLUTION :The definite geographical area formedby BIOTIC and ABIOTIC factors and their interactions with each other constitute the ecosystem. e.g. Pond ecosystem ,FOREST ecosystem, etc. |
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| 7495. |
Explain with diagram step-by-step energy conversion in: Power plant based on natural gas : |
Answer» Solution : In a power plant based on natural GAS, there are three main sections of the plant. There is combustion chamber with compressor in which the steam under pressure is introduced. The natural gas burns in the presence of air in this combustion chamber. This results in a production of a gas which is at very HIGH temperature and pressure. This generated gas from the chamber runs the TURBINE. The kinetic energy of the turbine drives the generator. The generator produces electrical energy. |
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| 7496. |
Resistivity of a material depends on ......... of the material. |
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Answer» the LENGTH of the WIRE |
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| 7497. |
Name two factors which determine whether a planet would have atmosphere or not. |
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Answer» SOLUTION :(i) VALUE of acceleration due to gravity (ii) Surface TEMPERATURE of PLANET. |
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| 7498. |
Define atomicity ,give one example. |
| Answer» SOLUTION :The number of atoms PRESENT in the molecule is CALLED its atomicity. | |
| 7499. |
In givenmagneticfield , whatshould the direction of motionof the conductorso thatthemaximum induced currentcan be produced ? |
| Answer» SOLUTION :PERPENDICULAR OT THEMAGNETICFIELD . | |
| 7500. |
Which of the following gas is found maximum in biogas ? |
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Answer» Methane |
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