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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.
| 4101. |
""_zX^(A) to ""_zY^(A) This reaction is possible in _____________ decay. |
| Answer» SOLUTION :GAMMA (`gamma`) | |
| 4102. |
Draw the diagram of the electric circuit in which the resistors R_1, R_2and R_3are connected in series including ammeter and voltmeter and mark the direction of current . |
Answer» SOLUTION :
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| 4103. |
In a voltmeter there are20 divisionsbetween 0 mark and 0.5 V mark. Calculate the least count of the voltmeter. |
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Answer» SOLUTION :Range of voltmeter = 0.5 V No. of divisions = 20 `:.` The LEAST count of the voltmeter `=("Range")/("TOTAL no.of divisions") =(0.5V)/(20) = 0.025V` |
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| 4104. |
Whatis the function of thebrushes in an AC generator ? |
| Answer» Solution :In an AC GENERATOR BRUSHES are usedto transfe current form the simplecoil/armatureof the genertorto THELOAD in (extermal) circuit. | |
| 4105. |
(i) Redraw the diagram shown and complete the path of the ray diagram.(ii) What is the difference between the virtual images produced by plane mirror, convex mirror and concave mirrors ?(iii) What does the negative sign in the value of magnification produced by a mirror indicate about a image ? |
Answer» Solution :(i)  (ii) VIRTUAL image FORMED by a plane mirror is of the same SIZE as the OBJECT. The image formed by a convex mirror is diminished. The image formed by a concave mirror is enlarged. (iii) When m is negative, it suggests that the image formed is real and inverted. |
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| 4106. |
(a) Write the function of each of the following parts of human eye: Cornea, iris, crystalline lens, ciliary muscles. (b) Millions of people of the developing countries of world are suffering from corneal blindness. These persons can be cured by replacing the defective corner with cornea of a denoted eye. A charitable society of your city has organised a campaign in your neighborhood in order to create awareness about this fact. If you are asked to participate in this mission how would you contribute in this noble cause? (i) Sate the objective of organising such campaigns. (ii) List two arguments which you would give to motivate the people to donate their eyes after death. (iii) List two values which are developed in the persons who actively participate and contribute in such programmes. |
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Answer» SOLUTION :(a) Cornea: Refracts the rays of light falling on the eye. Iris: Controls the size of the pupil. Crystalline lens: Focuses the image of the object on the retina. Ciliary muscles: Holds the eye lens and adjusts its focal length. (b) (i) These campaigns are organised to make people AWARE and realise their duties towards society. (ii) Following ARGUMENTS can be GIVEN: One person can give sight to two people. Our eyes can live even after our death. (iii) Values: Concern for others/Responsible behavior/Group work. |
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| 4107. |
Live wire, Neutral wire, Fuse wire, Earth wire |
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Answer» SOLUTION :Fuse WIRE. Fuse wire protects the electric CIRCUIT from short circuit whereas others TYPES of wires are used in home electrical CONNECTIONS. |
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| 4109. |
Define Power of a lens |
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Answer» Solution :(i) The DEGREE of CONVERGENCE or divergence of LIGHT rays. (ii) POWER of a lens is numerically defined as the reciprocal of its FOCAL length. `P=1/f` (iii) The SI unit is dioptre. |
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| 4110. |
The fossil fuel whose known reserves in the earth are expected to last for the minimum period is : |
| Answer» Answer :c | |
| 4111. |
Conventional and non-conventional sources of energy |
Answer» SOLUTION :
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| 4112. |
List four characteristics of the images formed by plane mirrors. |
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Answer» Solution :The characteristics of the IMAGES formed by plane mirrorsare `:` (i) The image formed by a plane mirror is virtual and erect. It cannot be received on a screen. (ii) The image formed by a plane mirror is of the same SIZE as the object. (iii) The image formedby a plane mirroris at the same DISTANCE behind the mirror as the object is in FRONT the mirror. (iv) The image formed in a plane mirror is laternally inverted. |
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| 4113. |
What is animal classification ? |
Answer» SOLUTION :
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| 4114. |
The refractive index of water with respect to air is ""_(a)mu_(w) and of glass with respect to air is ""_(a)mu_(g). Express the refractive index of glass with respect to water. |
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| 4116. |
How is liquor produced ? |
| Answer» Solution :Liquor is PRODUCED from ALCOHOL OBTAINED through fermentation of substances. | |
| 4117. |
What is resistor ? |
| Answer» SOLUTION :The MATERIAL which offers resistance to the motion of ELECTRONS is called RESISTOR. | |
| 4118. |
A compass needle is placed near a cunent-carrying wire. State your observation for the foUowing cases, and give reason for the same in each case : |
| Answer» SOLUTION :DEFLECTION of compass needle decreases. Magnetic field strength is INVERSELY PROPORTIONAL to the distance from WIRE. | |
| 4119. |
A man walks 8 m towards East and then 6 m towards North. His magnitude of displacement is |
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Answer» 10 m |
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| 4120. |
Magnification : h_(2)//h_(1): : power : ……………… . |
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| 4121. |
Mention any four phenomena that can be observed due to atmospherie relraction of light on the earth. |
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Answer» Solution :The sun is visible to us two minulcs before the ctual sunn rise. THC sun is visible to us Iwo iutes after the actual sunsct also. The apparent position of the star is slightly DIFFERENT from its actual position. Twinkling of star Formalion of rainbow The apparent random WAVERING or flickering of objects seen through a turbulent stream of hot AIR rising above a fire or a radiator. |
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| 4122. |
Explainthe directioncurrent (DC). |
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Answer» Solution :DC : Thiscurrentflows only in one direction. If thevoltage does not change with time , the currentremains constant. Thisis shown in figure 13.32.  Whena cell or battery is used to OBTAIN DC, the voltagegoes on decreasingalso decreases with time . In a circuit, theelectric CURRENT flows the positive terminal of the cell or batteryto the NEGATIVE terminalin theexternal circuit,that meansit flows only in one direction. Thus, the current obtained due to cell or batteryis unidirection . Itis calleddirectioncurrent (DC). Ageneratorthat produces direction currentis called a DC generatorwhichis alsocalled a dynamo. DC is used in RADIO, cell phone , watch, LAPTOP etc. |
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| 4123. |
A concave lens is a converging lens. True/False |
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Answer» SOLUTION :FALSE. A CONCAVE LENS is DIVERGING lens. |
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| 4124. |
While doing an experiment for the determination of focal length of a convex lens, Raja Suddenly dropped the lens. It got broken into two halves along the axis. If the continues his experiment with the same lens, (a) can he get the image? (b) is there any change in the focal length? |
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Answer» Solution :(a) YES he can get the IMAGE , because the lens broken into halves along the AXIS. (b) No , FOCAL length remains the same for the lens if its broken (or) not broken. |
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| 4125. |
What is the size of an air molecule ? |
| Answer» SOLUTION :The SIZE of AIR MOLECULE is of the ORDER of `10^-10 m`. | |
| 4126. |
What will be the effect on electricity generation if the channel taking water toturbine starts at point A in figure 5.17 of your textbook ? |
| Answer» Solution :As height INCREASES , potential energy increases. Thus at point A , potential energy of water will be MAXIMUM. If a canal/penstock carrying water from dam starts at point A, this maximum potential energy will be converted into kinetic energy due to which TURBINES will ROTATE with more SPEED. Thus more electrial energy will be generated. | |
| 4127. |
An object of height 1 cm is placed in front of a concave lens of focal length 40cm . If the object distance is 60 cm , find the position and height of the image . |
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Answer» SOLUTION :Data : `f=-40cm `(concave lens), `U=-60 cm, h_(1)=1 cm , v=?,h_(2)=?` `(i) 1/f =1/v-1/utherefore 1/v=1/f+1/u` `therefore 1/v=(1)/(-40cm)+(1)/(-60 cm) =-((1)/(40cm)+(1)/(60cm))` `=-((3+2)/(120 cm))=-(5)/(120)cm` `therefore v=-(120)/(5)cm =-25 cm` The IMAGE is FORMED at 24 cm from the lens . It is on the same side as the object . (II)`(h_(2))/(h_(1))=(v)/(u) therefore h_(2)=v/u h_(1)` `therefore h_(2)=((-24 cm)/(-60))xx1 cm =0.4xx 1 cm =0.4 cm` The heigth of the image is 0.4 cm |
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| 4129. |
Draw a labelled diagram to explain the formation of a rainbow in the sky. |
Answer» SOLUTION :
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| 4130. |
How the biodiversity can be conserved ? |
| Answer» SOLUTION :BIODIVERSITY can be conserved by FOLLOWING ways `:`Refer the QUESTION. | |
| 4131. |
The angle of incidence of any light ray passing through the centre of curvature of a spherical mirror is |
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Answer» `0^(@)` |
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| 4132. |
A gas is found to obey the law P^(2)V= constant. The initial temperature and volume are To and Vo. If the gas expands to a volume 3Vo. Its final temperature becomes : |
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Answer» <P>`(To)/(3)` |
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| 4133. |
Develop the notions of work and show that it leads to work-energy theorem . State the condition under which a force does no work . |
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Answer» Solution :WORK : The product of component of force in the direction of displacement and the magnitude of displacementis called work . `W=bar(F).bar(S)` When `bar(F)andbar(S) " are parallel "W=|bar(F)|xx|bar(S)|` When`bar(F)andbar(S)` has some angle`theta` between them `W=bar(F).bar(S)costheta`  Kinetic energy : Energy possessed by a moving body is called kinetic energy (k) The kinetic energy of an OBJECT is a measure of the work that an object can do by the virtue of its motion . Kinetic energy can be measured with equation `K=(1)/(2)mv^(2)` Ex : All moving bodies contain kinetic energy . Work energy theorem (For variable force ) : work done by a variable force is always equal to the change in kinetic energy of the body . Work done `W=(1)/(2)mV^(2)-(1)/(2)mV_(0)^(2)=K_(f)-K_(i)` Proof : Kinetic energy of a body `K=(1)/(2)mv^(2)` Time rate of change of kinetic energy is `(DK)/(dt)=(d)/(dt)((1)/(2)mv^(2))=(1)/(2)m.2v.(dv)/(dt)=mv.(dv)/(dt)` But `(dv)/(dt)=a` `therefore(dk)/(dt)=mav " but"ma="Force"(F)` `therefore(dk)/(dt)=Fv=F.(dx)/(dt)RARR(dk)/(dt)=F.(dx)/(dt) " or "dk=f.dx` When force is conservation force F = F (x) `therefore` On INTEGRATION over initial position`(X_(1))`and final position `(X_(2))` `int_(i)^(f)dk=int_(x_(1))^(x_(2))F(X)dx " but "int_(x_(1))^(x_(2))F(X)dx=` work done By variable force W `thereforeW=int_(i)^(f)rArrW=K_(f)-K_(i)` I.e ., work done by a conservative force is equal to chage in kinetc energy of the body . Coondition for force not to do any work . When Force `(bar(F))` and displacement `(bar(S))` are perpendicular work done is zero . , i.e., when `theta=90^(@)" then " W = bar(F). bar(S)=0` |
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| 4134. |
If the atomic mass of sodium is 23,then the number of moles 46 g of sodium is |
| Answer» Solution :Collateral BUNDLE is a TYPE of vascular bundle in which XYLEM LIES towards the CENTRE and phloem lies towards the periphery. | |
| 4135. |
Calculatethe mass of 1.51 xx 10 ^(23)molecule of H_2O. |
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Answer» Solution :`"Massof an atom " = ("Number of atoms ")/("Avogadro.s number ") xx "Mass of " H_2O` Mass `= (1.51 xx 10^(-23))/(6.023 xx 10^(23)) xx 18` `= (1.51)/(6.023) xx 18` `= (27.18)/(6.023) = 4.512 g ` (ii) 46 g of SODIUM ATOMIC mass of soidum = 23 Mass of sodium =46 No. of MOLES`=("mass ")/("atomic mass ") = 46/23` 2 mole of sodium (iii) `H_(2)O rarr= (1 xx 2) + (1 xx 16)` = 2 + 16 `H_(2)O = 18 g ` NO of molecule `= ("Avorgadro Number" xx " Given mass ")/("Gram molecular mass ")` `= (6.023 xx 10^23 xx 36)/(18)` `= 12.046 xx 10^23` atoms 36g water contains `rarr 12.046 xx 10^23` atoms |
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| 4136. |
What is the direction of magnetic field at the centre of a current- carrying circular loop? |
| Answer» Solution :The direction of MAGNETIC FIELD at the centre of a current-carrying CIRCULAR loop is perpendicular to the plane of the loop. | |
| 4137. |
The following diagram (Fig. 1.20) shows two parallel and opposite forces F_1 and F_2 each of magnitude 5N, with their lines of action separated by a distance of 2m. A point X is pivoted midway between F_1 and F_2 while a point Y is pivoted on F_2 (a) calculate the total moment of the two forces about the points (i) X, and (ii) Y (b) State the effect produced by the two forces about the points (i) X and (ii) Y |
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Answer» SOLUTION :(a) (i) Perpendicular distance of point X from EITHER of the forces `F_1 or F_2` is `1/2 times 2M=1m` `therefore` Moment of FORCE `F_1` about X `=5N times 1m` =5 Nm (clockwise) and moment of force `F_2` about `X= 5N times 1m` =5 N m (clockwise) Hence total moment of the two forces about X =5+5=10 N m (clockwise) (ii) Perpendicular distance of point Y from the force `F_1` is 2m while it is ZERO from the force `F_2` `therefore` Moment of force `F_1` about Y =`5 N times 2m` 10 Nm (clockwise) and moment of force `F_2` about Y=0 Hence total amount of the two forces about Y =10 Nm (clockwise) (b) (i) The effect of the two forces about the point X is to produce clockwise rotation. (ii) The effect of the two forces about the point Y is to produce clockwise rotation. |
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| 4138. |
What is Solar cell panel ? Name two materials used for making solar cell. Write two limitations of solar cells. |
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Answer» Solution :Solar cell PANEL comprises of a large number of solar cells and can PROVIDE a much HIGHER power for many uses. Two materials used for making solar cell are GALLIUM and Silicon. Limitations of Solar cells- (i) It is not available in night and on a cloudy day. (II) Energy reaching the surface is very much diffused, so direct utility is limited. |
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| 4139. |
Define 'One Rutherford (Rd)' |
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Answer» Solution :It is ANOTHER UNIT of radioactivity. It is defined as the quantity of a RADIOACTIVE substance, whic PRODUCES `10^(6)` disintegrations in one second. `1 "Rd" = 10^(6)` disintegrations per second |
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| 4140. |
All the constituent colours of sunlight do not have same rate of scattering. Under what condition all the colours are scattered equally. |
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| 4141. |
Does the thickness of a conductor influence its resitance ? |
| Answer» SOLUTION :YES, as the THICKNESS of the conductor increases the RESITANCE decreases. | |
| 4142. |
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to elecbic mains supply. What currnent is drawn from the line if the supply voltage is 220 V? |
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Answer» <P> Solution :`P_(1) =100` W ( For FIRST lamp)V = 220 V `P_(1) = VI_(1)` `I_(1)=(100)/(220) = 0.45 A ` Current in SECOND lamp of power `P_(2)` = 60 W `I_(2)= (P_(2))/(V) = (60)/(220) = 0.27 A ` `I = I_(1)+I_(2)=0.45+0.27= 0.72 A` |
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| 4143. |
The amount of heat energy required to rise the temperature of 1 gram of water through 1^(@)C is __________. |
| Answer» Answer :D | |
| 4144. |
What is the function of cotyledons? |
| Answer» Solution :The function of COTYLEDONS is to STORE food for the GROWTH EMBRYO. | |
| 4145. |
A student traces the path of a ray of light passing through a rectangular glass slab for three different values of angle of incidence (angle i) namely 30^(@), 45^(@) and 60^(@). He extends the direction of incident ray by a dotted line and measures the perpendicular distance 'l' between the extended incident ray and the emergent ray. He will observe that : |
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Answer» L' keeps on increasing with increase in angle of incidence |
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| 4146. |
Blue colour of sky is due to the phenomenon of scattering. How is Tyndal effect related to above phenomenon? |
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| 4147. |
A lamp rated 60W and an electric iron rated 800W are used for 6 hourseveryday. Calculate the total energy consumed in 30 days. |
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Answer» <P> Solution :`P_(1) 60 `W `"" P_(2) =800 W ``E_(1) = 60xx6 "" E_(2) =800xx6` =360 WATT -HR `""`=4800 watt -hr Total energy consumed E = `E_(1)+E_(2)` `=360 + 4800` = 5160 watt-hour Energy consumed in 30 DAYS = `5160xx30` `= 154800 ` watt- hour =154.8 kWh. |
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| 4148. |
How is cataract caused ? How is it cured ? |
| Answer» Solution :At old age, the eye LENS of some people becomes milky and cloudy causing blurred vision. This is called CATARACT and can be CORRECTED by cataract surgery. | |
| 4149. |
The power available from the solar cells is DC. True/False |
| Answer» Solution :FALSE.(The power available from soalr CELLS is always DC while the domestic aplliances that we USE work on AC.) | |
| 4150. |
A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct ? |
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Answer» The near point of his eyes has RECEDED away |
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