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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.
| 5502. |
Pressure cooker : Anodizing :: Silver plated spoons : _______ |
| Answer» SOLUTION :ELECTROPLATING | |
| 5503. |
What are isomers? Give example. |
Answer» Solution :Compound with identical MOLECULAR formula but different STRUCTURES are CALLED structural ISOMERS. 
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| 5504. |
What is meant by power of a lens ? You have three lenses A, B, C of power +10 D, +5 D and -10 D respectively. State the nature and focal length of each lens. Explain which of the three lenses will from a virtual and magnified image of an object placed at 15 cm from the lens. Draw the ray diagram in support of your answer. |
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Answer» <P> Solution :The degree of convergence or divergence of a LENS is called the power of a lens [P]. Power of a lens is defined as the RECIPROCAL of focal length of a lens.Power of lens [P] `=(l)/("Focal length of the lens in METRE (f)")` `P=(l)/(f)` Focal length in m `[f] = (f)=(l)/(P)` `{:(,"Lens A","Lens B","Lens C"),("Power",+ 10 D,+5 D,-10D),("Focal length",1//10=+0.1,1//5=+0.2,1//10=-0.1),(,m=+10 cm,m=+20cm,m=-10 cm),("Nature of lens","Convex lens","Convex lens","Concave lens"):}` Concave lens cannot form magnified virtual image. Lens B will form a virtual and magnified image of an object placed at 15 cm from the lens. Object distance `u=-15` cm which is less than focal length of the lens = 20 cm. In other words, the object is placed between the optic centre and focus of the convex lens. The image is formed on the same side as the object. 
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| 5505. |
(a) Define optical centre of a lens. What happens when a ray of light passes through the optical centre of lens ? (b) Define principal focus and focal length of a lens. Draw ray diagram to show the position of principal focus of a lens. |
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Answer» Solution :(a) The OPTICAL centre of a thin lens is a point on its principal axis, a ray of light passing through which goes straight without any bending (or DEVIATION). In FIGURE, the point O is the optical centre.  (b) Principal focus of a lens is a point where a light beam incident parallel to the principal axis of the lens, after refraction, actually converges to (in case of a convex lens) or diverges from (in case of a concave lens). Since, a lens has two refracting surfaces, a lens has two principal foci. `F_(1) and F_(2)` on either side of lens. The distance of principal focus of a lens from its optical centre is called its focal length f. Thus, `f = OF_(1) = OF_(2)`. 
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| 5506. |
A ray of light passes from medium 1 to medium 2. which of the following quantities of the refracted ray will differ from that of the incident ray speed, intensity, frequency, and wavelength ? |
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| 5507. |
Thermal power plant |
| Answer» Solution :In thermal power plant the turbines are rotated using steam. Here the coal is burnt. The heat energy liberated from this burning is used to heat the WATER in the boiler. This water PRODUCES steam of very high temperature and pressure. The kinetic energy in the steam rotates the turbines. The rotation of tubines produces itsown mechanical kinetic energy. The generators connected to tubines produce electrical energy. Thestem is CONDENSED in a condenser and converted back into water. In this way in thermal power plant, thermal energy to kinetic enerhgy, kinetic energy into mechancal energy and mechanical energy to electrical energy, are the CONVERSIONS that take PLACE. | |
| 5508. |
If the image formed by mirror for all positions of the object placed in front of its always virtual and diminished, state the type of the mirror. Draw a ray diagram in support of your answer. Where are such mirrors commonly used and why? |
Answer» Solution :CONVEX mirror Use of convex mirror: as rear VIEW mirror in vehicles. REASON: Always gives erect image with LARGE field of view. |
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| 5509. |
____________ influence is stronger in case of adolescents. |
| Answer» Solution :` ul ( PEER GROUP) ` influence is stronger in CASE of adolescents | |
| 5510. |
Assertion (A): When a resistance wire is stretched so as to make its length double, its resistance becomes 4 times of its original value. Reason (R ): Resistance of a conductor is directly proportional to its length and inversely proportional to its cross section area. |
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Answer» Both (A) and (R ) are true and (R ) is correct explanation of the assertion reduced to one half of its ORIGINAL value i.e., `A.=A/2` SO the new resistance `R.=(rho l.)/A.=(rho(2l))/((A//2))=4(rho l)/A=4R`. |
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| 5511. |
Resistivity of a given conductor depends on |
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Answer» length of CONDUCTOR |
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| 5512. |
If the work done to take 3 C electric charge from one point to another point is 15 J, what will be the potential difference between these two points? |
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Answer» Solution :POTENTIAL DEFFERENCE `V =W/Q` `=(15J)/(3C) = 5V` |
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| 5514. |
The moderator used in nuclear reacton is ____________. |
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Answer» Cadmium |
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| 5515. |
Observe the diagram given and answer the question asked. b. What are the reasons of this defect? |
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Answer» Solution :The reasons are as follows: i. The NEAR point of the eye is no longer at 25 cm but has shifted FARTHER away. ii. The curvature of the cornea and the eye lens decreases so that, the converging POWER of the lens becomes less. iii. The DISTANCE between the retina and eye lens decreases. |
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| 5516. |
Explain glycolysis in detail. |
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Answer» Solution : (1) Carbohydrates are CONVERTED to GLUCOSE after the process of digestion is completed. The oxidation of glucose for releasing energy is called glycolysis which takes place in cytoplasm. (2) Glycolysis can occur in presence of oxygen or without oxygen too. The first type of glycolysis takes place in aerobic respiration and the second type is in anaerobic respiration. (3) In aerobic respiration, there is step-wise oxidation of glucose molecule FORMING two molecules each of pyruvic acid, ATP, `NADH_2` and water. (4) Later the pyruvic acid formed in this process is converted into molecules of Acetyl-Coenzyme-A along with two molecules of `NADH_2` and two molecules of `CO_2`. (5) During anaerobic respiration along with glycolysis there is FERMENTATION too. This is incomplete oxidation of glucose and thus it results in formation of lesser energy. (6) The process of glycolysis was discovered by Gustav Embden, . Otto MEYERHOF, and Jacob Parnas. Therefore, in their honour, glycolysis is also called Embden-Meyerhof-Parnas pathway (EMP pathway). For the discovery they had performed experiments on muscles. |
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| 5517. |
Rainbow formation or Prove that a rainbow is the combined effect of the refraction, dispersion and total internal reflection of light. |
Answer» Solution : (i) The beautiful phenomenon of the rainbow is a combination of different phenomena NAMELY dispersion of light, internal reflection and REFRACTION of light. (ii) The rainbow appears in the sky after a rain shower. (iii) The water droplets ACT as small prisms. (iv) When sunlight ENTERS the water droplets present in the atomosphere, they refract and disperse teh incident sunlight. That results in a spectrum. (v) Then teh light RAYS get reflected internally inside the droplet and finally again get refracted. (vi) As a collective effect of all these phenomena, the seven coloured rainbow is observed. (vii) In the morning, rainbow can be seen towards west, while in the evening, it can be seen towards the East. |
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| 5518. |
a] What is a solenoid ?Draw the patterns of magnetic field lines of a solenoid through which a steady currentflows. What does the pattern of field lines the solenoid indicate?b] Write one use of a solenoid . |
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Answer» Solution :a] A coil of insulated copper wire woundin the form of a CYLINDER is a solenoid. Whencurrent is passed through a solenoid, it produces MAGNETIC fieldlines like a bar magnet. The pattern of magnetic field linesof a solenoid is shown in the figure. Inside the solenoid, field lines are parallel to each other This indicatesthat the magnetic fieldis UNIFORM . b] Solenoids are USED in hotel door-locks, are CONDITIONERS, storage hard-disks, speakers, microphones, power plants, cars, etc. 
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| 5519. |
____________has been newly launched in Police Department |
| Answer» Solution :` UL ( Cybercrime unit ) ` has been newly LAUNCHED in Police DEPARTMENT | |
| 5520. |
We are not above to see some specific animals about whichwe had listened from our earlier generations. Who is responsible for this ? |
| Answer» Solution :Humans are solely responsible for this. The impacts of human ACTIVITIES are so ADVERSE that MANY plant and animal SPECIES have become extinct. | |
| 5521. |
How can the people be made aware of the need to conserve the environment ? |
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Answer» Solution :i.Environmental problems can be RESOLVED only if protectionand conservation of environment becomes an effective public movement. ii. Values like POSITIVE attitude, affecton about the environment, knowledgeabout the environment, etc, can be achieved by increasing awareness through education. iii. Also, many people are unaware about the rules of environment conservation. Thus, SPREADING awareness about the importance of protection of environment is necessary. For this purpose television , radio can be used EFFECTIVELY. Stree PLAYS,posters can also be used for spreading awareness. iv. All the developed, developing and underdevelopedcountries have accepted the responsibility of conservation of environment. We as responsible citizens should participate on large scale for environment conservation. |
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| 5522. |
If earth has a mass 9 times and radius 4 times than that of a planet 'P'. Calculate the escape velocity at the planet 'P' if its value on earth is 11.2 kms^(-1). |
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Answer» <P> Solution :`v_e= SQRT((2GM)/(R_e)), v_(p)= (sqrt(2GM_p))/(R_p)``M_p= (M)/(9), R_p = (R_e)/(4)` `:. ""v_p= sqrt(2G(M)/(9)XX(4)/(R_e))` `=(2)/(3)sqrt((2GM)/(R_e))=(2)/(3)xx11.2= (22.4)/(3)` `=7.47 KM"/"sec`. |
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| 5523. |
How does sound reach our ears from the source of its production? |
| Answer» SOLUTION :SOUND travels in the FORM of WAVES. It reaches our EARS from the source of its production, in the form of waves. | |
| 5524. |
Whatis theprincpleof an electricmotor ? |
| Answer» SOLUTION :When a rectangularcoil carryinga currentis placedin a magneticfield ,then forces , EQUAL in MAGNITUDE and oppositein direction , acts on is two parallel sides , perpendicular to their lengths , due to whichthe coilrotates CONTINUOUSLY. | |
| 5526. |
Explain why, when it is getting dark at night, it is impossible to make out the colour of cars on the road. |
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| 5527. |
What is colour blindness ? |
| Answer» Solution :When a person is unable to RECOGNISE red,green and blue colour, it is CALLED colour blindness. It is a genetic disorder and cannot be CURED. | |
| 5528. |
Deer, Goat , Sheep, Snake |
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Answer» SOLUTION :SNAKE Snake is CARNIVORE, WHEREAS REST are hervibores. |
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| 5529. |
What is the impact of excessive irrigation and intensification of agriculture ? |
| Answer» Solution :It has resulted in ENVIRONMENTAL DEGRADATION and creation of few waste lands . Water logging has ultimately caused development of saline SOIL. | |
| 5530. |
How do you demonstrate the formation of crests and troughs in a slinky? |
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Answer» Solution :1) Hang a slinky from a fixed support. 2) Hold it gently at the lower end and quickly move your HAND sideways and back. 3) This will cause a hump on the slinky near the lower end. 4) The hump travels upwards on the slinky as shown in the FIGURE. 5) The humps formed alternately are known as crests and TROUGHS. 
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| 5531. |
The energy released due to a controlled chain reaction can be utilized for _________ purposes. |
| Answer» SOLUTION :CONSTRUCTIVE | |
| 5532. |
Assertion: Transmission of heat takes place in the conduction, Convection and Radiation. Reason: Heat can be transferred from higher temperature to lower temperature. |
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Answer» both the ASSERTION and the reason are TRUEAND the reason is the correct explanation of the assertion. |
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| 5533. |
The chemical equation that represent neutralization reaction among the following is |
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Answer» `BaCl_(2)+H_(2)SO_(4)rarrBaSO_(4)+2HCl` |
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| 5534. |
When steam condenses to form water "…........................" |
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Answer» HEAT is ABSORBED and TEMPERATURE increases |
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| 5535. |
Radiation leakage occurred after a blast in an atomic energy plant at Chernobyl in Russia. |
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| 5536. |
Observe the disaster cycle given below and explain each aspect of the disaster of earthquake. |
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Answer» Solution :The main aspects of disaster CYCLE to tackle disaster of earthquake are as follows : (1) Preparation : With the help of seismograph, the warning about forthcoming earthquake can be obtained these days. The intensity of the earthquake is also predicted with the help of technology. If the estimate of the Richter scale is on the higher sides, there would be more preparatory measures TAKEN to tackle the forthcoming problem of earthquake. (2) Redemption : Once this information isobtained the possible impact of the earthquake on the houses, buildings, people can be studied by thegeological experts. The meetings of the DisasterManagement Authority will be organized for same. (3) Preparedness : What the general publicshould do and what action the reserved forces should take, will be decided in case of actual incidence of the earthquake. The schemes and plans will be made ready in this direction. ( 4) Impact of Earthquake : In case of disaster of earthquake, people will be helped to safety. 'l'he trapped people will be rescued. First aid and other necessary help will be provided. The data about the losses and the intensity of this disaster will be noted and reported for the further process. (5) Response : In this phase the response of the people as well as the action of Government can be well studied. The response should b~ . quick and positive. The maximum lives and property should be saved by such responses. The disaster of earthquake should be managed with POSITIVITY and through help given to the sufferers. (6) Resurgence : Earthquakes can destroy the entire households or even entire community. Such homeless people should be given the place to stay. Resurgence is important phase for the national welfare. If the citizens of India are cared for, the nation too will progress. (7) Restoration : The earthquake victims shouldbe settled by providing them with new SETTLEMENTS. Sometimes, entire village is to be settled. E.g. In Latur or Kutch, there was very large scale devastation. But Government of India as well as some NGOs helped to reconstruct the houses. In such earthquake-prone areas, houses are built in specific PATTERN to withstand any possible future calamities. |
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| 5537. |
Complete the following with the help of suitable diagram. The rules used for drawing ray diagrams for the formatino of image by a convex lens. Rule 1:_________,(b) Rule 2:_________,( c) Rule 3:_________ |
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Answer» Solution :The rules used for drawing ray DIAGRAMS are as follows: (a) Rule 1 : When the incident ray is paralled to the principal axis, then the refrected ray passes through the principale FOCUS F . (b) Rule 2 : When the incident ray is PASSING through the principal focus, the fefracted ray is direction parallel to the principale axis. (c) Rule 3 : When a incident ray passes throught the optical centre of the lens, it passes without changing its direction 
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| 5538. |
What is meant by the power of accommodation of eye? |
| Answer» SOLUTION :The ability of the eye to focus the DISTANT OBJECTS as well as the nearby objects on the retina by CHANGING the FOCAL length of the eye lens is called power of accommodation. | |
| 5539. |
On which factors does the resistivity of a conducting wire depend? |
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Answer» The length of the WIRE |
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| 5540. |
In a circuit, two resistors of resistances 5 Omega and 10 Omega are connected in series. Compare the current passing through the two resistors. |
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Answer» SOLUTION :In a series combination of resistors, the same current passes through all the resistors and it is same as the total current of the CIRCUIT. Hence, here current will be the same in TWO resistors. So, the RATIO of the current will be 1: 1. |
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| 5541. |
What is meant by electric resistance of a conductor? |
| Answer» Solution :The electric RESISTANCE of a CONDUCTOR is a MEASURE of its opposition for flow of CHARGE through it. | |
| 5542. |
How to dispose the nuclear waste safely is a big challenge bofore the scientists. Why is it so? |
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| 5543. |
Observe the following figures and complete the table . |
Answer» SOLUTION :
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| 5544. |
A person with myopia can see objects plaecd at a distance of 4 m. if he wants to see objects at a distance of 20 m, what should be the focal length and power of the concave lens he must wear? |
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Answer» SOLUTION :GIVE that x=4m and y =20m. Focal length of the correction LENS is `f=(xy)/(x-y)` `f=(4xx20)/(4-20)` `=(80)/(-16)=-5m` Power of the correction lens `=(1)/(f)-=(1)/(5)=-0.2D` |
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| 5545. |
A student has to connect 4 cells of 2 V each to form a battery of voltage 8 V. The correct way of connecting these cells is shown in figure : |
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| 5546. |
A student wanted to pick up a concave mirror from three mirror A, B, C lying on a table to find its focal length. He looks into mirror A, he finds his image enlarged and erect. When he looks in mirror B, his image is diminished and erect. When he looks in mirror C, his image is erect and of same size. Find the correct identification of A, B C in respective order. |
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Answer» Solution :(i) Mirror A is concave. When the face is PLACED close to the concave mirror, it produced enlarged and erect image. (ii) Mirror B is convex. When the object is at finite distance from the mirror the image formed by the convex mirror is diminished, virtue and erect. (iii) Mirror C is place. Image formed by a PLANE mirror us ALWAYS virtue and erect. The SIZE of the image is equal to that of the object. |
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| 5547. |
List two methods of producing magneticfields. |
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Answer» Solution :Magnetic field can be PRODUCED by : i] Using any MAGNET-bar magnet, horseshoe magnet, or round magnet ii] A straightwire CARRYING CURRENT iii] A loop or a solenoid carrying current. |
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| 5548. |
State the characteristics of the series combination of resistors. |
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Answer» Solution :Characteristics of a series combination of resistors are as follows: (1) The same CURRENT flows through each RESISTOR and is equal to the total current flowing in the series CIRCUIT. (2) The potential difference (voltage) across the combination is equal to the sum of the potential differences across the INDIVIDUAL resistors. (3) The equivalent resistance of the combination is equal to the sum of the individual RESISTANCES and hence is greater than any of the individual resistances or greater than the largest resistance. (4) The potential difference across each resistor is directly proportional to the resistance of the resistor. |
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| 5549. |
Calculate the refractive index of the material of a glass slab. Given that the speed of light through the glass slab is 2 xx 10^(8) m//s and in air is 3 xx 10A^(8) m//s. |
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Answer» Solution :As per QUESTION speed of light in air `c = 3 xx 10^(8) m s^(-1)` and speed of light through the glass slab `v = 2 xx 10^(8) m S^(-1)` `therefore`REFRACTIVE index of glassslab n = `(c )/(v)=(3xx10^(8))/(2XX10^(8))=1.5` |
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| 5550. |
An object 5cm is placed at a distance of 20cm in front of a convex mirror of radius of curvature 30cm. Find the position, nature and size of the image. |
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Answer» Solution :Object DISTANCE,u=-20cm object height, h=5cm Radius of CURVATURE, R=30cm Radius of curvature`=2xx` Focal length R=2f f=15cm ACCORDING to the MIRROR formula, The positive value of image height indicates that the image formed is ERECT. Therefore, the image formed is virtual erect,and smaller in size |
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