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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.
| 5451. |
Define disasters. |
| Answer» Solution :The UNPREDICTABLE dangerous events which OCCUR many times in the environment are KNOWN as DISASTERS. | |
| 5452. |
(a) What is an electric motor ? Write the principle on which its working is based . (b) What is short circuit ? Give its possible cause. |
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Answer» Solution :(a) Electric motor is a device which transforms the electric energy into kinetic energy for doing work. The working ofelectric motor is based on 'Fleming's LEFT hand rule'. This rule states that , "If we hold the forefinger, middle finger and thumb of our left hand, mutually perpendicular to each other, and if forefinger gives the direction of CURRENT, then the thumb gives the the direction of motion of the conductor due to force ACTING on it. (B) short circtui: When live wire comes in contact with the neutral wire in between the circtuit, then a lot of current flows abruptly through the circuit. such a phenomenon is known as short circuit. When many electric appliances are connected in one circuit (through the same switch), then short circuit can occur. |
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| 5453. |
Most of the sources of energy we use represent stored solar energy . Which of the following is not ultimately derived from the Sun's energy ? |
| Answer» Answer :A | |
| 5454. |
Mention the diseases caused by tobacco smoke. |
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Answer» SOLUTION :Lung cancer, bronchitis, pulmonary TUBERCULOSIS, EMPHYSEMA and hypoxia are some on the diseases caused by tobacco smoke. Protina, Shakti and Rathna are lysine rich MAIZE HYBRIDS which are developed in India |
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| 5455. |
Mention some space missions done by the given Indian astronauts |
Answer» SOLUTION :
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| 5458. |
What happens when the battery is conneted in a circuit ? |
| Answer» Solution :A POTENTIAL difference is CREATED between the ends of the CONDUCTOR, When the battery is connected in a circuit. In a circuit. | |
| 5459. |
Name a device that helps to maintain a potential difference across a conductor. |
| Answer» Solution :Potential difference ACROSS a CONDUCTOR can be maintained by means of a BATTERY consisting of ONE or more cells. | |
| 5460. |
When the gas formed on heating lime stone is passed through freshly prepared lime water, the lime water turns milky. |
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Answer» Solution :When lime stone is heated, calcium oxide and CARBON dioxide are formed. This carbon dioxide gas is passed through freshly prepared lime water, insoluble calcium carbonate and water are formed. In this reaction, lime water TURNS MILKY. `CA(OH)_(2)+CO_(2)rarrunderset("carbonate")underset("Calcium")(CaCO_(3)darr)+H_(2)O` |
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| 5461. |
A certain form of energy is available due to the difference in the temperature of water at the surface of the ocean and its deeper levels. (a) Name the form of energy.(b) Is this energy ultimately derived from the sun or not ?(c ) Explain how this form of energy can be converted into electricity.(d) What is the minimum temperature in water at the surface of ocean and its deeper level which is required to operate power plants based on this energy ? |
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| 5462. |
List the properties of magnetic lines of force (magnetic field lines). |
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Answer» SOLUTION :Properties of magnetic lines of force (also known as magnetic field lines) are listed below: (1) Outside a magnet, the magnetic field lines are directed from N-pole of magnet towards S-pole. However, INSIDE a magnet, the field lines are directed from S-pole to N-pole. Thus, magnetic field lines are closed curves. (2) A magnetic field line always POINTS in the direction of magnetic field. (3) The relative strength of magnetic field lines is given by DEGREE of closeness of the field lines. The magnetic field is STRONGER in the region where the field lines are crowded. (4) No two magnetic field lines can ever intersect with each other. |
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| 5463. |
Fill in the blanks: Q: Total internal reflection occurs only when a ray of light passes from a _____medium to a ____medium. |
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| 5464. |
The heteroatoms present in CH_(3) - CH_2) - O - CH_(2) - CH_(2) Clarea) Oxygenb) Carbonc) Hydrogend) Chlorine |
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Answer» a and b |
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| 5465. |
(a) What is meant by electric current ? Give its direction ? (b)Name and define its unit. (c ) Which instrument is used to measure the electric current ? How should it be connected in a circuit ? |
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Answer» Solution :(i) • Electric current is OFTEN termed as "current and it is represented by the symbol .T.. It is defined as the RATE of flow of charges in a conductor . • The electric current represents the amount of charges flowing in any cross section of a conductor in unit time. (ii) The current flowing through a conductor is said to be one ampere, when a charge of one coulomb flows ACROSS any cross-section of a conductor, in one second. Hence, I ampere=`(1" coulomb")/(1" second")` (iii)• Ammeter is USED to measure the current. • An Ammeter is connected in series with the circuit. • The Ammeter is a low impedance device connecting it in parallel with the circuit would cause a short circuit, damaging the Ammeter or the circuit. |
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| 5466. |
The far point of a myopic person is 80cm in front of the eye. What is the nature and power of the lens required to correct the problem. |
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Answer» Solution :The person is SUFFERING from an eye defect called myopia. In this defect, the image is formed in front of the RETINA. HENCE a concave lens is used to CORRECT this defect of vission. Object distance, u - infinity - `oo` Image distance, v=-8cm, Focal length=f According to the lens formula `1/v-1/u = 1/f` `- 1/80 - 1/oo = 1/f` `1/f =- 1/80` `f =- 80 cm = - 0.8 m` We know , power , P = 1/f(in meter) `P= (1)/(-0.8) = - 1.25D` A concave lens of power -1.25D is required by the person to correct his defect . |
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| 5467. |
Calculate the amount of heat generated while transferring 90000 coulombs of charge between the two terminals of a battery of 40 V in one hour. Also determine the power expended in the process. |
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Answer» Solution :Q = 90000 t= 1 h = 3600 s V = 40 V `I = (Q)/(t) = (90,000)/(3600) = 25 `A `R= (V)/(I) =(40)/(25) = 1.6 Omega` `H= I^(2) Rt = 25 xx25xx1.6xx 3600` `=36xx10^(5) H or 3600 kJ` `P =I^(2)R = 25 xx25xx1.6 ` = 1000 W = 1 KW. |
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| 5468. |
What is the focal length in case of spherical mirrors ? |
| Answer» SOLUTION :It is the DISTANCE between FOCAL LENGTH and FOCUS. | |
| 5470. |
The wire having a green plastic covering is a |
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Answer» LIVE WIRE |
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| 5471. |
Define stimulus. |
| Answer» SOLUTION :Stimulus refers to the CHANGES in the ENVIRONMENTAL condition that are detected by receptors PRESENT in the body. | |
| 5472. |
Which one is stress hormone |
| Answer» Solution :Abscisic ACID (ABA) is a growth inhibitor which regulate abscission and dormancy. It INCREASES tolerance of plants to various kind of stress. Hence, it is CALLED as stress hormone. It is found in the chloroplast of plants | |
| 5473. |
You must have seen chandeliers having glass prisms. The light from a tungsten bulb getsdispersedwhile passing throughthese prisms and we see coloured spectrum. If we use an LED light instead of a tungsten bulb, will we be able to see the same effect ? |
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Answer» Solution :1. No, the DISPERSION of light from a TUNGSTEN bulb and light from an LED willnot be the same. 2. This is because: (i) The intenity of the colors in LED will not be as uniform as that with tungsten. (ii) The color distribution seen MAY vary with manufacturer. 3. LED emisson has a narrow BAND of colors, and not CONTINUOUS as in light from tungsten. |
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| 5474. |
Energy is not propagated by |
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Answer» STATIONARY WAVES |
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| 5475. |
A student focuses the image of a well illuminated distant object on a screen using a convex lens. After that the gradually moves the object towards the lens and each time focuses its image on the screen by adjucting the lens. (a) In which direction -towards the screen or away from the screen, does he move the lens ? (b)What happens to the size of the image-does it decrease or increase ? (c) What happens to the image on the screen when he moves the object very close to the lens ? |
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Answer» SOLUTION :(a) He should move the lens AWAY from the SCREEN. (b) Size of the image INCREASES. (c) No image will be formed on the screen. |
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| 5476. |
A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following |
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| 5477. |
Explain the need and importance of space missions |
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Answer» SOLUTION :1.Space technology plays a very crucial role in development of a NATION. 2. Today, we can contact a person in any PART of the world within a second. We can gather information about worldwide events sitting at home. Due to INTERNET, every information is available at our fingertips. 3. It has become possible to get advance alert about NATURAL calamities and take proper precautions. 4.During war, it is possible to get information about the actions of the enemy through aerial surveillance using satellites. 5. It is also possible to explore the fossil reserves and minerals in the earth. 6. Hence, space technology is an inevitable part for development of a nation |
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| 5479. |
Define G (universal gravitational constant). |
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Answer» Solution :`F=G=(m_(1)m_(2))/(r^(2)) THEREFORE G=(Fr^(2))/(m_(1)m_(2))`. If we TAKEN `m_(1)=m_(2)="unit"` mass and r = unit distance, numerically, G = F , i.e., G (universal gravitational constant) REPRESENTS the magnitude of the gravitational force of attraction between two unit masses, separated by a unit distance. |
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| 5480. |
Explain with diagram step-by-step energy conversion in: Nuclear Power Plant : |
Answer» SOLUTION : In nuclear power plant, the energy is released by FISSION of nuclei of atoms like Uranium or Plutonium. This energy is used to generate the STEAM of high temperature and high pressure. The kinetic energy in the steam rotates the turbine. The turbine in turn drives the generator to PRODUCE electricity. |
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| 5481. |
A substance through which light can pass is called a/an |
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Answer» OPTICAL medium |
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| 5482. |
Velocity of light in diamond, glass and water decreases in the following order: |
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Answer» WATER GT DIAMOND gt glass |
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| 5483. |
One half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain you observations |
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Answer» SOLUTION :The convex lens will form complete IMAGE of an object, even if its one half is covered with black paper. It can be understood by TWO CASES. Case I- when the UPPER half of the lens is covered with black paper  When the upper half of the lens is covered In this case, a ray of light coming from the object will be refracted by the lower half of the lens. These rays meet at the other side of the lens to form the image of the given object, as shown in the above figure. Case II- When the lower half of the lens is covered with black paper.  When the lower half of the lens is covered In this case a ray of light coming from the object is refracted by the upper half of the lens. These rays meet at the other side of the lens to form the image of the given object, as shown in the above figure. |
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| 5484. |
The value of universal gas constant |
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Answer» `3.81 MOL^(-1) K^(-1)` |
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| 5485. |
Explain in detail the role of anomalous behaviour of water in preserving aquatic life in regions of cold climates such as polar regions.. |
Answer» Solution : In COLD regions, during winter, the temperature of the atomosphere falls well below `0^(@)C `. As the temperature decreases, the water at the surfaces of lakes and PONDS starts contracting. Hence, its density increases and it sinks to the bottom. This process contiues till the temperature of all the water in a lake falls to `4^(@)C `. Asthe water at the surface COOLS further, i.e., its temperature falls below `4^(@)C `, it starts expanding instead of contracting .Therefore,its density decreases and it remains at the surface.The temperatureof the water at the surface CONTINUES to fall to `0^(@)C`.Finally , the water at the surface is converted intoice, but the water below the layer of ice is at`4^(@)C`. Ice is a bad conductor of heat. Hence, the layerof the ice at the surfacedoes not allow TRANSFER of heat from the water to the atmosphere.As the water below the layer of ice remains at `4^(@)C `, fish and the aquaticanimals and plants can survive in it. |
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| 5486. |
(i) Define optical centre of spherical lens. (ii) A divergent lens has a focal length of 20 cm. At what distance should an object of height 4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away from the lens. Find the size of the image also. (iii) Draw a ray diagram to show the formation of image in above situation. |
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Answer» SOLUTION :(i) Optical centre: the central point of a lens. (II) f=-20 cm `h_(1)=4cm, v=-10 cm` `U=?,h_(2)=?` `1/f=1/v-1/u` `1/u=(-1)/10+1/20=(-1)/10+1/20` `=(-20+1)/20=-1/20` `u=-20cm` `h_(1)=v/u h_(0)` `=(-10cm)/(-20cm) xx4cm=2cm` 
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| 5487. |
At sea level, the value of "g" is maximum at …………………… |
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Answer» the POLES |
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| 5488. |
Lound speaker, Microphone, Electric motor , Magnet. Find the Odd one out. |
| Answer» SOLUTION :Magnet. It exerts a force on a MAGNETIC material, the remaining THREE convert one FORM of energy into another. | |
| 5489. |
Distinguish between a convex lens and a concave lens. |
Answer» SOLUTION :
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| 5490. |
We should not use many electrical appliances simultaneously. |
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Answer» Solution :i. Electrical appliances like GEYSER, heater, motor, OVEN, washing machine, etc. have high POWER consumption. II. If such appliances are connected simultaneously, large AMOUNT of current flows in the circuit. iii. This current may exceed permissible value and cause overloading. iv. It can result in causing fire. Hence, we should not use many electrical appliances simultaneously. |
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| 5491. |
The world's known coal reserves are expected to last for about : |
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Answer» 200 years |
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| 5492. |
A student carries out the experiment for studying the dependence of current (I) flowing through a resistor system of R_(1) and R_(2) on the potential difference (V) applied to it by connecting the resistor system to points X and Y of the measuring circuit as shown : The average value of the ratio V/I, of his observations, would then be equal |
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Answer» only in CASES A and B |
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| 5493. |
How does a battery maintain a constant potential difference between its terminals ? |
| Answer» Solution :We KNOW that a BATTERY consists electric force `(F_(e))` and chemical. force `(F_(e)).`These TWO POTENTIAL difference between its TERMINALS. | |
| 5494. |
Which part of the human eye is mainly donated after death ? |
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Answer» Retina |
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| 5495. |
Distinguish between the physical properties of metals and nonmetals with respect to the point : Melting and boiling points. |
| Answer» Solution :Melting and boiling points : The melting and boiling points of METALS are high, exceptions : sodium, potassium, MARCURY, gallium: The melting and boiling points of nonmetals are low, exceptions: CARBON, SILICON. | |
| 5496. |
At very___________ temperature and _____________ pressure, real gas behave as an ideal gas. |
| Answer» SOLUTION :HIGH, LOW | |
| 5497. |
What is the periodic trend in the variation of valency while going down a group? Explain your answer with reserence to the group 1, group 2 and group 18. |
Answer» Solution : The velency of an element is determined by the number of valuence elenctrons persent in the outermost shell of an atom of an element. All the elements in a grop have the same numbr of VALENCE elements. Therefore, elements in the same GROUP should have the same valency. For example, the elements of group , the valence electron, the valency of elements of group 1 is ONE. Similarly for group 2, (Be, Mg, Ca ) contain two valence electrons, the valency of elements of group 2 in two. The elements of group 18 (Ne ,Ar ) contain 8 electrons (exception, HELIUM contain 2 electrons). Since the octect is complected their valency is zero. |
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| 5498. |
The velocity of sound in air at a particular temperature is 330ms^(-1). What will be its value when temperature is doubled and the pressure is halved? |
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Answer» `330ms^(-1)` |
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| 5499. |
Draw ray diagram to shown the principal focus of a (i) concave mirror, (ii) convex mirror. |
Answer» SOLUTION :Ray DIAGRAMS have been SHOWN in following FIGURES RESPECTIVELY. 
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| 5500. |
An obliquely incident light ray bends at the surface due to change in speed, when passing from one medium to another. The ray does not bend when it is incident normally. Will the ray have different speed in the other medium ? |
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