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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.
| 7151. |
Light travels fastest through which of the following materials ? |
| Answer» ANSWER :D | |
| 7152. |
An object is placed at a distance of 40 cm from a convex lens and its real and inverted image of same size is formed on a screen placed on other side of lens. The focal length of lens is |
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Answer» `+40` cm `(1)/(f) = (1)/(v) - (1)/(u) = (1)/((+40)) - (1)/((-40)) = (1)/(40) + (1)/(40) = (1)/(20) rArr f = +20 cm` |
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| 7153. |
Choose the incorrect statement: |
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Answer» the value of distance travelled by a moving BODY can never be zero or negative. |
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| 7154. |
Disaster Management Act, 2005. |
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Answer» Solution :(1) Government of India has made Disaster Management Act in 2005. The affected people are given all necessary help as per this act. With the humanitarian view, people are REHABILITATED and helped them to come back to normalcy after the disaster. (2) As per this act, National Disaster Response Force has been established. (3) This force consists of 12 divisions in entire India which are attached with Indian Army. (4) The headquarter is located in Delhi, but the action is taken all over the country with help of army. As per the act, in Maharashtra National Disaster Response Force is in action through STATE Reserve Police Force. The personnel of this force are trained accordingly, and they take part in the rescue work during different disasters. |
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| 7155. |
(a) Which lens is used for correcting a mypoic eye ? (b) Which lens is used for correcting a hypermetropic eye ? |
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Answer» SOLUTION :(a) For correcting a MYOPIC eye, we use a CONCAVE LENS of suitable FOCAL length. (b) For correcting a hypermetropic eye. We use a convex lens of suitable focal length. |
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| 7156. |
A stationary charge is surrounded by : |
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Answer» NEITHER ELECTRIC nor MAGNETIC field |
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| 7157. |
A light ray is incident on a concave mirror which passes through the centre of curvature of a concave mirror. Which of these rays indicates the reflected ray ? |
| Answer» Answer :A | |
| 7158. |
The clear sky appears blue because |
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Answer» blue light GETS easily absorbed in the ATMOSPHERE. |
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| 7159. |
When light rays enter the eye, most of the refraction occurs at the. |
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Answer» CRYSTALLINE lens |
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| 7160. |
State whether thestatements are true or false. An electric motor converts mechanical energy into electrical energy. |
| Answer» Solution :False, because an ELECTRIC motor CONVERTS electric energy into MECHANICAL energy. | |
| 7161. |
The energy possessed because of position or configuration is called_____________. |
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Answer» |
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| 7162. |
One atomic mass unit is equivalent to …………. Energy |
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Answer» 931 eV |
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| 7163. |
An insulated sphere of radius R has a uniform volume charge density lambda. The electric field at a point A, which is at distance r from its center is given by (R gt r) |
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Answer» ZERO |
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| 7164. |
The maximum number of components into which a vector in space can be resolved is |
| Answer» SOLUTION :INFINITE. | |
| 7166. |
What is meant by equilibrant ? |
| Answer» Solution :A system can be brought to equilibrium by applying ANOTHER force, which is EQUAL to the resultant force in magnitude, but OPPOSITE in direction. Such force is called as .Equilibrant.. | |
| 7167. |
At the time of short circuit, the current in the circuit : |
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Answer» REDUCES substantially |
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| 7168. |
Statethe characteristics of themagneticfidlproduced bya current - carryingcircularloop. Sketch its magnetic fieldlines. |
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Answer» Solution :Whena currentis passed through a circular loop , a magenticfield is produced aroundit . The patter fromedby the magnetic field line of themagneticfield due toacurrent - carrying circular loop is SHOWN in figure .  Themagnetic field lines of the fieldproducedby a current- carryingcircular loop are circularandconcentricnear the loop . As we move away from wire , theconcentriccircles representingthe magneticfieldaroundit becomesang larger . (The magnetic fieldis proportional to thecurrentand decreases as wemoveaway from the loop ). When we reachat the CENTREOF thecircularloop, the arcs of thesebig circles would apper as a straight line . Here every point on thecircularwire carrying currentwould give rise to the magnetic fieldapperingas straigth linesatthe magneticfield appearing as straight lines atthe centreoftheloop . By applyingthe Right- handthumb RULE ,it can be seen that every section of thewireproduces magneticfield/ field lines in the same direction within the loop. Hence , at the centre of the circular loop, all the magneticfield lines are in the same directionand aid each other due to which the strenght of themagneticfieldincreases. In caseof a current - carryingcircular coil havingN turns, the magneticfield produced is N times as large as that produced by a coil havingsingle turn ,assumingthat all turns havenearly the sameradius. Thisis because the currentin eachcircular turns has the samedirection and the fielddue to each turn then justadd up . Thus, magntidueof the magneticfield B produced at the centreof the coilis: (1) Directlyproportional to the currnetI flowingthrough it , i.e.,`B prop I` (2) Inversly proportional to theradiusr of the coil , i.e., `B prop (1)/(r)` . (3) Directly propotional to TOTAL NUMBEROF turns N of the coil , i.e., `B prop N ` . |
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| 7169. |
a) What is a balanced chemical equation? b) Write the balanced reactions for the following: (i) Potassium Bromide + Barium iodide toPotassium iodide Barium Bromide. (ii) Zinc carbonate + Zinc oxide + carbondioxide |
| Answer» Solution :a) An equation in which the number of ATOMS of each on the TWO side of an equation is equal is called a balanced chemical equation. ii) ` ZnCO_3 (s) to ZnO(s)+ CO_2(G)` | |
| 7170. |
Electric current flows from the ___________ terminal of the battery to the ______________ terminal through a wire. |
| Answer» SOLUTION :POSITIVE , NEGATIVE | |
| 7171. |
Explain about the variation of acceleration due to gravity. |
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Answer» Solution :Variation of acceleration due to GRAVITY (g) : (i) Since, g depends on the geometric radius of the Earth, `(gprop1//R^(2))`, its value changes from one place to another on the surface of the Earth. (II) The geometric radius of the Earth is maximum in the EQUATORIAL region and minimum in the polar region, the value of g is maximum in the polar region and minimum at the equatorial region. (iii) When you move to a higher altitude from the surface of the Earth, the value of g reduces. (iv) when you move deep below the surface of the Earth, the value of g reduces. Value of g is ZERO at the CENTRE of the Earth. |
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| 7172. |
What do you mean by selfiecid ? |
| Answer» Solution :The act by a person of INDULGING in CLICKING selfies WITHOUT being aware of the WORLD arund and the RISKS involved is knonw as selfiecide. | |
| 7174. |
The minimum number of unequal vectors whose vector sum can be zero is |
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Answer» 1 |
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| 7175. |
Why do different colours get separated when a white light passes through a prism ? How can we recombine the components of white light after a prism has separated them ? Explain with the help of a figure. |
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Answer» Solution :Light rays of different colours travel with same speed in vacuum and air. But in any other medium, they travel with the different speeds and BEND through different ANGLES, which LEAD to the dispersion of light. Newton showed that the reverse of dispersion of light is also possible. He kept two identical prisms close to each other-one erect and the other in an inverted position as SHOWN in the figure. The light gets dispersed when it passes through the first prism. The second prism receives all the SEVEN coloured rays. from first prism and recombines them into the original white light. This obervation show that sunlight is made up of seven colours.  it is essential that the two prisms used should be identical and placed in inverted position with respect to each other because then, the second prism cancels the dispersion caused by the first prism so that white light can be obtained. |
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| 7176. |
Cellular respiration is |
| Answer» Solution :Oxidation of GLUCOSE and other food components which takes place inside the cell in presence or ABSENCE of oxygen, is KNOWN as cellular respiration. | |
| 7177. |
How do you measure quickly the approximately focal lengthof a concave mirror? |
| Answer» SOLUTION :Hold the concave mirror facing some distant object like a TREE. Hold a cardboard screen in front of the mirror. Adjust the position of the screen so that a SHARP image of distant object is formed on the screen. The distance of screen from the mirror gives us the APPROXIMATE FOCAL length of the concave mirrror. | |
| 7178. |
2 A electric current is passed for 1 minute through a conducting wire. How much electric charge will pass through this wire? |
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Answer» 2C `:. Q = I xx t = (2 A) (1 xx 60S)` `=120 C` |
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| 7179. |
Mention the purpose of blackening the interior of a solar cooker. |
| Answer» Solution :BLACK SURFACE absorbs more heat than a white and PREVENTS heat LOSS. | |
| 7180. |
mention two ways in which water harvesting can be undertaken. |
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Answer» SOLUTION :The two ways by which water HARVESTING can be UNDERTAKEN are : (i)Capturing run - off water from ROOF tops. (ii)Capturing run - off water from LOCAL catchments. |
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| 7181. |
Which of the following graph indicate uniform velocity ? |
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Answer»
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| 7182. |
Sun appears red in colour during sunrise but appears white at noon. Explain with the reasons. |
| Answer» SOLUTION :Blue colour is SCATTERED the most and red colour the least by air molecules and particles in the earth.s atmosphere. At noon, only little blue and VIOLET colours are scattered and hence, the sun appears white. At sunrise or sunset, sunlight passes through a longer DISTANCE in the atmosphere. En route, blue colour [shorter wavelength] would have been mostly removed by SCATTERING leaving behind red colour [longer wavelengths] which reaches our yes. Thus, at sunset or sunrise, the sun appears reddish in colour. | |
| 7183. |
Give the name of two energy sources that you would consider to be exhaustible. Give reason for your choices. |
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Answer» SOLUTION :Two exhaustible energy sources are as FOLLOWS: * Coal: It is produced from dead remains of plants and animals that REMAIN buried under the earth.s crust for million of YEARS. It takes MILLIONS of year to produce the demandof coal. However, coal cannot replenish with in a short period of time. Hence, it is a non - renewable or exhaustible source of energy. * Wood: It is obtained from forests, Deforestation at a faster rate has caused a reduction in the number of forests on the earth It takes hundreds of years to grow a forest. If deforestation is continued at this rate, then there would be no wood left on the earth , hence, wood is an exhaustible source of energy. |
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| 7184. |
X-rays and radiations from atomic energy plants : Artificial radiations ::"__________": Natural radiation |
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Answer» SOLUTION :UV and IR radiations X-rays and radiation are from ATOMIC energy plants whereas UV and IR are NATURAL radiations. |
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| 7185. |
Describe the refraction of light through prism. Draw the diagram and explain |
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Answer» Solution :Prism is a transparent OPTICAL element which refracts light. An optical object to be defined as prism must have at least two faces with an ANGLE between them. Triangular prism is the most common type of prism. It has a triangular base and rectangular sides When a ray of light enters the prism, it bends towards the normal, because light is ENTERING from a rarer medium to a denser medium. Similarly, when the light emerges from the prism, it follows the laws of refraction of light. Due to the angle of the prism and due to differentwavelength of different components of white light, the emergent ray gets segrated into different colours. FINALLY, a colouful band of seven colours is obtained. This phenomenon is called dispersion of white light by the prism. Refraction of light through prism  
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| 7186. |
State four characteristics of the image formed by plane mirror. |
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Answer» SOLUTION :(i) Image distance=Object distance (II) SIZE of the image = size of the object (iii) Image is lateraly inverted. (IV) Image is always virtual and erect. |
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| 7187. |
How do we perceive diferent colours? |
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Answer» Solution :1.We perceive different colours, because the coical cells in our retina respond to the COLOURES and GIVE INFORMATION about the COLOUR of the OBJECT to the brain. Brain processes all the information and we see image of the object and the colours. 3. When red colour falls on the eyes, the cells reponding to red light get excited more than those responding to ohter colours and we get the sensation of red colours. 
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| 7188. |
Probiotics are |
| Answer» Solution :FOOD products CONTAINING ACTIVE vacteria are CALLED PROBIOTICS. | |
| 7189. |
. . . . . . . . .. .Is used to indicate the direction os current. |
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Answer» |
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| 7190. |
What is electric motor? Explain its working. |
| Answer» SOLUTION :A device which CONVERTS electric energy into MECHANICAL energy is called an electric MOTOR. | |
| 7191. |
A plane is in level flight at constant speed andeach of its two wings has an area of 25m^(2). If the speed of air is 180 km/h over the lower wing and 234 km/h over the upper wing surface, determine the plane's mass (take air density to be 1 kg//m^(3)). |
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Answer» |
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| 7192. |
If the convex lens of focal length 10 cm and a concave lens of focal length 50 cm are kept in contact with each other. What will be the behaviour of the combination (behaviour as a convex lens/concave lens) ? |
| Answer» SOLUTION :The focal length of the COMBINATION of the lenses is POSITIVE. This shows that the combination will BEHAVE as a convex lens. | |
| 7193. |
A bullet of mass 5 g travelswith a speed of 500 ms^(-1) .if it penetrates a fixed target which offers a constant resistive force of 1000 N to the motion of the bullet ,find ,(a) the intial Kinetic energy of the bullet penetrated before coming to rest,and (c)the speed with which the bullet emerges out of the target if target is of thickness 0.5 m. |
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Answer» Solution :Given ,m=5 G=`5xx10^(-3)` kg,v=500 `MS^(-1)` F=1000 N (a)Kinetic energy of the bullet `=(1)/(2)mv^(2)` `=(1)/(2)xx(5xx10^(-3))xx(500)^(2)=625 J` (b)LET the bullet penetrate through a distance S m in the target . Work is obtained the INITIAL kinetic energy of the bullet . `therefore` 1000 S=625 or S=625/1000 =0.625 m THUS,the distance penetrated by the bullet =0.625 m (C)Energy spent against the resistive force offered by the target in penetrating through it `therefore ` Kinetic energy left with the bullet on emerging out of the target =625 J-500 J=125 J If the speed of bullet is now v,then kinetic energy =`(1)/(2)mv^(2)` `therefore (1)/(2)mv^(2)=125 J` or `(1)/(2)xx(5xx10^(-3))v^(2)=125` or `v.=sqrt((2xx125)/(5xx10)^(-3))=223.6 ms^(-1)` |
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| 7194. |
A current - carrying conductor is placed in a magnetic field. Nowanswer the following : (i) List thefactors on whichthe magntiudeof forceexperienced by conductor depends . (ii) When is themagnitude of this force maximum ? (iv) Statethe rule whihchelps in findingthe directionof motionof conductor. (iv)Ifinitially this forcewasactingfromrightto left, how will the direction of force change , if : (a) direction of magneticfield is reversed ? (b) directionof current is reversed ? |
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Answer» Solution :(i) The magnetic of FORCE experienced by current- carryingconductorwhenplacedin a magneticfield dependson (a) currentflowing (I),(b) lengthof conductor (I),(c) the strenght of magneticfield (B) , and (d)orientationof conductor in magnetic field . (ii)Magnitudeof forceis maximum when current- carryingconductoris placed at rightangles to the directionof magnetif field . (III) See Point Number13 UNDERTHE HEADING " Chapter At A Glane". (iv) (a) Directionof forceis reversed that is nowthe force acts from left to RIGHT . (b) Direction of forceis reversed thatin now the force acts from left toright. |
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| 7195. |
What is mirror formula ? Under what conditions is it valid ? Obtain an expression for magnification of an image formed by a concave mirror. |
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Answer» Solution :Mirror formual is a relation between the object-distance (U), the image-distance (v) and the focal length (f) of the mirror. According to mirror formula : `(1)/(v) + (1)/(u) = (1)/(f)` The mirror formula is true for concave and convex mirrors both, IRRESPECTIVE of the fact WHETHER the image formed is real or virtual. However, proper sign for u, v, f and R be applied as per sign convention followed. CONSIDER the formation of the image A.B. of an object AB by a concave mirror. As shown in Figure the right angled triangles ABP and A.B.P are similar triangles, hence `(A.B.)/(AB) = (PB.)/(PB)`  As per sign convention followed, PB = -u, PB. = - v, AB = SIZE of the object = +h and A.B. = size of the image = -h.. Hence, we have `(-h.)/(h) = (-v)/(-u) pr (h.)/(h) = - (v)/(u)` Thus, by definition of magnification of image, we have Magnification, `m = (h.)/(h) = - (v)/(u)`. |
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| 7196. |
What is the angle between velocity vector and acceleration vector in unitorm circular motion ? |
| Answer» SOLUTION :`90^(@)` | |
| 7197. |
The velocity -time graph for a body with non-uniform motion is a |
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Answer» STRAIGHT LINE |
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| 7198. |
Draw the diagram of a DC generator. Then explain as to how the DC current is obtained. |
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Answer» Solution :(C) Electric Generator (DC) A generator which converts mechanical energy into electrical energy in the form of DIRECT current is called as D.C. generator. Construction: The main components of D.C. generator are: i. Rectangular coil (ABCD): It consists of a large number of turns of insulated copper wire wound on an iron core in rectangular shape. ii. Strong magnets: The coil is placed between the two pole pieces (N and S) of a strong magnet that produces a strong magnetic field. (iii.) Split ring: It consists of two halves of a metallic ring to which the ends of the coil are connected. iv. Brushes: Carbon brushes `(B_(1) and B_(2))` are used to press the rings. v. Axle: The function of axle is to rotate with the coil.  Working: i. When the axle is rotated with the help of a machine from outside, the coil ABCD starts rotating. ii. On rotating the axle, the branch AB move upwards and branch CD move downwards and coil ABCD rotates clockwise. iii. According to Fleming's right hand rule, electric current flows in the direction `ArarrBrarrCrarrD`. Therefore, current flows in the EXTERNAL circuit through galvanometer. iv. After half rotation, the branch AB and CD EXCHANGE their position and the induced current flows as `Drarr CrarrBrarrA`. v. SINCE, the branch which is moving upwards is always in CONTACT with brush B1 and the branch which is moving downwards is always in contact with brush `B_(2)`, current flows in the same direction in the external circuit, thereby producing direct current. |
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| 7199. |
To detect the explosives in the luggage Am^(241) is used. |
| Answer» SOLUTION :To detect the explosives in the LUGGAGE californium `CF^(253)` is used. | |
| 7200. |
What is autogamy? |
| Answer» Solution :The TRANSFER of pollen GRAINS from the another to the STIGMA of same flower or another flower borne on the same plant is KNOWN as self pollination. Self pollination is also known as Autogamy. EG. Hibiscus. | |
