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.
| 7601. |
What is elastic scattering ? |
| Answer» SOLUTION :The energy of incident LIGHT beam and SCATTERED light beam are the same, thenthe scattering is SAID to be elastic scattering. | |
| 7602. |
n electrons, each carrying a charge -e, are flowing acrossa unit cross section of a metallic wire in unit time from east to west. Write an expression for electric current and also give its direction of flow. Give reason for your answer. (b) The charge possessed by an electron is 1.6 times 10^-19 coulomb. Find the number of electrons that will flow per second to constitute a current of a 1 ampere. |
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Answer» Solution :ELECTRIC current in a circuit defined as the TIME rate of flow of electric charge through any cross section and its direction is opposite to that of flow of electrons. HENCE in present case electric current `I=q/t=(n E)/1=n e` As electrons are flowing from east to WEST, the direction of electric current is from west to east. (b) Here current I=1A, time t=1s and charge on each electron `e=1.6 times 10^18` Hence, number of electrons flowing `n=(It)/e=(1 times 1)/(1.6 times 10^-19)=6.25 times 10^18` |
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| 7603. |
Observe the diagram given and aswer the question asked. b. What decides the colour of human eye? |
| Answer» SOLUTION :The colour of Iris decides the colour of human EYE. The colour of Iris is DIFFERENT for different PEOPLE. | |
| 7604. |
(a) Draw a labelled diagram of excretorysystem in human beings and label the following: (i) left kidney, (ii) renal artery, (iii)urinary bladder,(iv) urethra (b) Name the functional unit of kidney. (c) Name two nitrogenous wastes released from kidney. |
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Answer» SOLUTION :(b) The functional unit of kidney is Nephron. (c) These NITROGENOUS WASTES are: Urea and URIC acid. |
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| 7605. |
Four students A, B, C and D showed the following traces of the path of a ray of light passing through a rectangular glass slab. The trace most likely to be correct is that of student : |
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Answer» A |
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| 7606. |
Latent heat of vapourization : |
| Answer» SOLUTION :The heat energy absorbed at constant temperature during transfomation of liquid into GAS is called the LATENT heat of vapourization. | |
| 7608. |
A sound wave has a frequency of 200 Hz and a speed of 400ms^(-1) in a medium. Find the wavelength of the sound wave. |
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Answer» Solution :A SOUND wave of FREQUENCY, `n=200Hz` Speed `=400" MS"^(-1)` The WAVELENGTH of the sound wave, `LAMDA=(400)/(200)=2m` |
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| 7609. |
By which optical phenomenon, the splitting of white light into seven constituent colours occur |
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Answer» REFRACTION |
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| 7610. |
How does leech respire? |
| Answer» Solution :RESPIRATION takes place through the skin in leech. The exchange of RESPIRATORY gases takes place by diffusion. OXYGEN dissolved in water diffuses through the skin into haemocoelic FLUID, while carbon dioxide diffuses out. | |
| 7611. |
What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of thatquantity ? |
| Answer» SOLUTION :ENERGY, 1 EV = 1.6 `x×`10-19 J | |
| 7612. |
Disater is a very fast process, in fact it is an accident. What shall we do in such situation? How can we protect ourselves, our belongings and animals? |
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Answer» Solution :i. DISASTERS are unpredictable but losses can be minimized I a planned manner. ii. Being aware of precautionary measures of any DISASTER and taking needed actions during actual disasters situation is IMPORTANT. iii. Also MAN made disasters can be avoided. iv. Helping each other in disaster situation is our ethical responsibility. |
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| 7613. |
Watt is equal to |
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Answer» `A OMEGA` |
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| 7614. |
Which defect of vision can be rectified using a concave lens ? |
| Answer» SOLUTION :MYOPIA or SHORT SIGHTEDNESS. | |
| 7615. |
StateFleming's left -handrule . |
| Answer» SOLUTION :Fleming.s left - handrule statethat strecththeforefinger ,the central fingerand thethumbof your left-hand in mutually perpendicular to EACHOTHER . If theforefinger shows the directionof THEMAGNETIC fieldand the central fingerthat ofthe current, then thumn will pointtowards the direction of motion of the conductor (i.e., the thumbwill POINTIN the directionof force F). | |
| 7616. |
What precautions will you take to maintain reproductive health? |
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Answer» SOLUTION :Precautions to maintain reproductive health : (i)Having scientific and authentic information about the reproductive PARTS and process is the first step to maintain reproductive health. (ii)Cleanliness of genitals and other private parts is NECESSARY. (iii) Appropriate sanitary measures during menstruation. (iv)Not to INDULGE in sexual RELATIONS and experiments in young age. |
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| 7617. |
Is there a gravitational force between two objects kept on a table or between you and your friend sitting next to you? If yes, why don't the two move towards each other? |
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Answer» Solution :YES there is a force of ATTRACTION between the two objects as well as me and my friend. We KNOW `F alpham_(1) m_(2)` Since the mass of me and my friend is very less as compared to the Earth, the force is also very less. Hence we don't move towards each other. |
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| 7618. |
Artificial environment does not affect natural environment. |
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Answer» SOLUTION :FALSE. ARTIFICAL environment can AFFECT the NATURAL environment, DIRECTLY or indirectly. |
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| 7619. |
Write down the difference between the sound and light waves. |
Answer» SOLUTION :
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| 7620. |
Why do we see our image in a shining spoon ? |
| Answer» Solution :The SHINING surface of spoon behaves LIKE a CURVED MIRROR. | |
| 7621. |
Solar cells are made of : |
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Answer» CONDUCTORS |
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| 7622. |
Define ocean thermal energy. |
| Answer» SOLUTION :The energy available DUE to the DIFFERENCE in the temperature of water at the surface of the OCEAN and at deeper levels is called Ocean THERMAL Energy [OTE], | |
| 7623. |
The valueofacceleration due to gravity on surfaceof the moon is _______ ms^(-2) . |
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Answer» |
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| 7624. |
Classify the following thingsinto like parallel and unlike parallelforces ( Draggingwater from well ,force appliedto crow bar , weight balance , turningpen cap ) |
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Answer» SOLUTION :Dragging water from WELL - Like parallel FORCES Force applied to crow BAR - Unlike parallel forces Weight balance - Lightparallel forces Turningpen cap - Unlike parallel forces |
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| 7625. |
During transformation of liquid phase to solid phase, the latent heat is ______ |
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Answer» given off or released |
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| 7626. |
Direction of magnetic field produced by the currentcarrying conductor is given by : |
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Answer» right hand GRIP RULE |
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| 7627. |
Whatis an electromagnet? Statethe principle on whichit works. Draw a circuitdiagram to show how a soft iron piece can be transformed into an electromagnet. Writeuses of electromagnet. |
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Answer» Solution :Electromagnet : An electrongnetis a magnet consisting of a longcoil of insulatedcopper wire wound arounda soft iron core in the from of a rod. It is magnetised onlywhen an ELECTRICCURRENTIS passed through the coil . OR An electrongnet is temporary strong magnet and is justa solenoidwith its windingon a soft iron core . Theworking of an electrognet is BASED onthemagnetic effect ofelectric current .  A strong magnetic fieldproduced insidea current - carrying solenoid can be used to magnetise a piece of magnetic material like soft iron , byplacingit insidethe coil / solenoid(figure 13.17) . The magnet soformed is called an electromagnet. ANELECTROMAGNET acquires themagneticproperties onlywhenan electric currentis passed through the solenoid . Once the currentis switchedoff ,it almost loses its magneticproperty as the retentivity( theabilityto retain magnetism) of soft iron is verylow . The strength of the electromagnet depends on : (i) The numberof turns per unit length n of thesolenoid . (ii) ThecurrentI through the solenoid . Uses of electromagnets : (1) Electromagnets are usedin electrical devices such as an electric bell , an electric fan ,TELEGRAPH , an electric train ,an electric motor, genertor etc. (2) They are used for lifting and transporting large masses of iron in the from of girders . (3) They are used in medical paractice forremovingpieces of iron from wounds . |
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| 7629. |
Complete the following sentence : Angle of deviation is the angle which the ____ray makes with the direction of _____ray. |
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Answer» |
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| 7630. |
War, Fire, Volacano, Bomb blast. |
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Answer» Solution :Volcano Volcano is a geological disaster, WHEREAS the REST are INTENTIONAL man -made DISASTERS. |
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| 7631. |
What is Resistance ? What are the SI Units of Resistance ? |
| Answer» Solution :RESISTANCE of a CONDUCTOR is defined as the OBSTUCTION to the MOTION of the electrons in a conductor. It's S.I UNIT is Ohm. | |
| 7632. |
When a ray of light passes from a rarer medium to a denser medium, the angle of refraction is ……….. . |
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Answer» EQUALTO angle of incidence |
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| 7633. |
Whena person uses a convex lens as a simple magnifying glass, the object must be placed at a distance __________. |
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Answer» LESS than ONE FOCAL length |
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| 7634. |
A man exerts a force of 200 N in pulling a cart at a constant speed of 16 m s^(-1).Calculate the power spent by the man. |
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Answer» SOLUTION :GIEN ,force =200 N,velocity =16 m `s^(-1)` Power =Force `xx` velocity |
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| 7635. |
How can you say that the sound is a form of energy? |
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Answer» Solution :1) Take a tin can and remove both ends to make a hollow cylinder. 2) Take a balloon and stretch it over the can. 3) Wrap a rubber band around the balloon. 4) Take a small MIRROR and stick it on the balloon. 5) Take a laser light and let it fall on the mirror. 6) After reflection the light spot is seen on the wall. 7) Now shout directly into the open end of the can and observe the dancing light. Observations : 1) When sound is made, the ENERGY produced from the sound vibrates the membrane of the balloon, resulting in the dancing of light ray. 2) This shows that sound is a form of energy which travels in air.  .
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| 7636. |
An object of height 3 cm is placed at 10 cm from a concave lens of focal length 15 cm. find the size of the image. |
Answer» Solution :(i)  `1/f=1/v-1/u` `f=-15` cm [LEFT side oflens] `u=-10` cm [left side of lens] `1/v=1/f+1/u` `""=1/(-15)+1/(-10)` `""=((1/-15) times 30+(1/-10) times 30)/30` `""=(-2-3)/30=(-5)/30=(-1)/6` `v=-6cm` `m=v/u=h_(2)/h_(1)` `""=(-6)/(-10)=h_(2)/(3)` `""=(-18)/(-10)=h_(2)` Size of the image `h_(2)=1.8cm` (ii) Given, time, t = 9.8 s Speed of sound, v = 330 `ms^(-1)` Height of CLOUD, `d=?` `v=d//t, ""d=vt` `""=330 times 9.8` `""d=3234 m` |
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| 7637. |
(a) What is short-sightedness ? State the two causes of short-sightedness (or myopia). With the help of ray diagram, show : (i) the eye-defect short-sightedness. (ii) correction of short-sightedness by using a lens. (b) A person having short-sight cannot see objects clearly beyond a distance of 1.5 m. What would be the nature and power of the corrective lens to restore proper vision ? |
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| 7638. |
On the basis of the issues raised in this chapter. What changes would you incorporate in your lifestyle in a move towards a suitable use of our reasources? |
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Answer» Solution :Three methods of suitable use of resources are as follows: • Will move in public transport system to CONSERVE petrol . • Instead of coal & natural gas, will prefer to use SOLAR energy for cooking • Will obeyrationalised handling of all renewable resources • Take care not to pollute the environment with WASTE. • Should realise that we are LIVING in a COMMUNITY and are not alone |
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| 7639. |
Give reasons : The time difference between actual sunset and apparent sunset is about 2 minutes |
| Answer» Solution :SUN is visible to us about 2 minutes even after the actual crossing of the sun below the horizon in the EVENING due to the phenomenon of ATMOSPHERIC refraction. So the time difference between actual sunset and APPARENT sunset is 2 minutes. | |
| 7640. |
Forthe samethicknessof thelens, ifthe radiusofcurcaturein increased , thefocallengthwill_______ |
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Answer» Reduced |
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| 7641. |
The speed (v) of sound in a gas is given by v = k P^(x) ρ^(y) Where K is dimensionless constant, P is pressure, and ρ is the density, then |
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Answer» `X = ½, y = ½` `[M^(@)LT^(-1)]=[ML^(-1)T^(-2)]^(x)[ML^(-3)]^(y)` `0=x+y,1=-x-3y,-1=-2x` `y=-x""x=1//2` `=-1//2` |
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| 7642. |
The device that reverses the direction of current flow through the coil of an electric motor afterevery half rotation is called ______. |
| Answer» SOLUTION :SPLIT RING COMUTATOR | |
| 7643. |
If the force of gravitation acts on apples on the tree at different height from the surface of the earth, can it also act on object at even greater heights, much farther at even greater heights, much farther away from the earth, like for example, the moon? |
| Answer» Solution :YES, the gravitational FORCE acts on objects at GREATER heights and FARTHER away from the earth like the moon | |
| 7644. |
If the force of gravitation acts on apples on the tree at different height from the surface of the earth,can it act on even farther objects like the other planets and the sun ? |
| Answer» SOLUTION :Yes, the gravitational force ACTS on other PLANETS and sun | |
| 7645. |
Two ores X and Y were taken. On heating these ores it was observed that ore Y gives SO_(2)gas. |
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Answer» SOLUTION :Ore Y GIVES the metal by roasting `2ZnS + 3O_(2) overset("Heat") rarr 2ZnO + 2SO_(2)` `ZnO + C overset("He")rarr Zn + CO` The second step of REDUCTION with carbon is common with both ores |
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| 7646. |
Consider the two circuits A and B given alongside : In the circuits A and B shown here, the voltmeter reading would be : |
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Answer» NEARLY 4.5 V in both the circuits |
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| 7647. |
The refractive index of water with respect to air is 4//3. What is the refractive index of aiir with respect to water ? |
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Answer» |
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| 7648. |
2C_(2)H_(5)OH + 2Na to 2C_(2)H_(5)O"Na" + H_(2) : Oxidation :: CuO + H_(2) to Cu+ H_(2)O : __________ |
| Answer» SOLUTION :REDUCTION | |
| 7649. |
List out the parasitic adaptations in leech. |
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Answer» Solution :(i) Parastic adaptation of leech : (a) Anterior and Posterior ends of the body are provided with suckers by which the animal attaches itself to the body of the host. (c ) The salivary glands produce Hirudin, which does not allow the blood to coagulate. So, the continuous supply of blood is maintained. (ii) Darwin published his observations under the name "origin of species". It elaborates on the theory of natural selection for evolutionary transformation. The principles of Darwinism tells that natural selection is a driving force for evolution. 1. Overproduction : Living beings have the ability ot reproduce and have the capacity to multiply in a geometrical manner. 2. Struggle for existence : Due to overproduction a geometric ratio of increase in population occurs.The space to live and food avialable for the organisms remain the same. This creates a competition among the organisms, for food and space, leading to struggle. (a) The competition may be among the individuals of the same species (Intraspecific struggle). (b) Competition between the organisms of different species living together (Interspecific struggle). (c ) Natural conditions like extreme heat or cold drought and floods can affect the existence of organisms (Environmental struggle). 3. Variations : Small variations are important for evolution. ACCORDING to Darwin, FAVOURABLE variations are useful to the organisms and unfavourable variations are harmful or useless to the organisms. 4. Survival of the FITTEST or Natural selection : During the struggle for existence, the organisms which can overcome the challenging situation, survive and adapt to hte surrounding enviornment. Organisms, which are unable to face the challenges, are unfit to survive and disappear. The PROCESS of selection of organisms with favourable VARIATION is called as Natural selection. 5. Origin of species : According to Darwin, new species originates by the gradual accumulation of favourable variations for a number of generations. |
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| 7650. |
Sketch , label and classify the following organisms : |
Answer» SOLUTION :
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