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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.
| 4351. |
A truck weighing 5xx10^(3) kgf and a cart weighing 500 kgf moving with the same speed Compare their kinetic energies. |
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Answer» SOLUTION :Given ,MASS of truck `m_(1)=5xx10^(3)` kg, mass of cart `m_(2)` =500 kg Since speeds are same ,kinetic energy is DIRECTLY PROPORTIONAL to the mass (`K prop m)`. `THEREFORE (k_(1))/(K_(2))=(m_(1))/(m_(2))=(5xx10^(3))/(500)=(10)/(1)` or ,`K_(1),K_(2)=10:1` |
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| 4352. |
Imagine that you are sitting in a chamber with your back to one wall. An electron beam moving horizontally from back wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field ? |
Answer» Solution :An electron beam moving horizontally from back wall towards the front wall is equivalent to a CURRENT flowing in the opposite direction (i.e. from front wall towards the back wall). The DEFLECTION of electron beam as seen by OBSERVATION is to his right SIDE and is SHOWN in figure. On applying Fleming.s left hand rule we find that the magnetic field is acting in vertically downward direction. 
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| 4353. |
Sound travels in rocks in the form of ................. |
| Answer» SOLUTION :both LONGITUDINAL and TRANSVERSE ELASTIC WAVES | |
| 4354. |
A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the : |
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Answer» LENS and the OBJECT |
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| 4355. |
A block placed on a rough horizontal surface is pulled by a horizontal force F. Let f be the force applied by the rough surface on the block. Plot a graph of f versus F. |
Answer» SOLUTION : Uuto point A, F = F (50 Long as block is stationary) beyond A, when F increases, block STARTS moving f remains constant. |
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| 4356. |
The work done in moving a charge of 10 C across two points in a circuit is 100 J. What is the potential difference between the points ? |
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Answer» SOLUTION :Charge `Q=10` C, WORK Done, `W=100` J Potential Difference `V=(W)/(Q)=(100)/(10)` THEREFORE, `V=10` volt |
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| 4357. |
An electric iron consumes energy at a rate of 840W when heating is at the maximum rate and 360W when the heating is at the minimum. The voltage is 220V. What are the current and the resistance in each case? |
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Answer» Solution :(a) When heating is at maximum rate, the POWER rating P=840 W and supply voltage V=220V `therefore` Current flowing `I=P/V=(840 W)/(220 V)=3.82 A` and resistance of electric iron `R=V/I=(220V)/(3.82A)=57.6 OMEGA` (b) When heating is at minimum rate, the power rating P=360W `therefore` Current flowing `I=P/V=(360 W)/(220 V)=1.64A` and resistance of electric iron `R=V/I=(220V)/(1.64A)=134.2 Omega` |
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| 4358. |
Calculate the number of units consumed by a TV in a leap year which is rated at 100 W if it is used 6 hours per day. |
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Answer» <P> Solution :Data :P = 100 W,` t = 6 (" hours")/("day")xx 366 "days" ` = 2196 hours1 unit = 1 kW.h = 1000 W.h N = ` (Pt)/( 1000 W.h.//"unit") = ( 100 W xx 2196 " hours")/(1000 " W.h/ unit")= 219.6 " UNITS"` 219.6 units are CONSUMED in a leap YEAR. |
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| 4359. |
Collect pictures showing various situation where potential energy possessed by an object depends on its shape and position. Prepare a scrap book. |
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Answer» SOLUTION :Note : students can collect pictures of different OBJECTS at different heights, with different SHAPES. e.g : 1) A stone on a hill. `""` 2) A book on a table and a pen on a table, etc. Paste these pictures in your SCRAP book. |
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| 4360. |
What is the directionof magnetic fieldlines of a magnet ? |
| Answer» SOLUTION :Form N - POLE towards S - pole outsidethe magenet, andfrom S - poletowards N -pole insidea magnet . | |
| 4361. |
Assertion (A) : A convex lens forms a virtual, erect and enlarged image of an object situated between the lens and its principal focus. Reason (R) : A convex lens is a diverging lens. |
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Answer» Both (A) and (R) are true and (R) is correct explanation of the ASSERTION. |
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| 4362. |
Draw a schematic diagram of a circuit consisting of a battery of 3 cells of 2V each,a combination of three resistors of 10 Omega, 20 Omega and 30 Omega connected in a parallel, a plug key and an ammeter, all connected in series. Use the circuit to find the value of the following :(a) current through each resistor (b) total current in the circuit. (c )total effective resistance of the circuit. |
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Answer» Solution :The circuit diagram is drawn hare. HEREB is a battery of 3 cells of 2V each i.e. having a total voltage of 6 V, three resistors `R_(1) = 10 Omega, R_(2) = 20 Omega, R_(3) = 30 Omega` connected in a parallel across points P and Q a plug key K and and ammeter A all joined in series. (a) Current through resistors, `R_(1), I_(1) = (V)/(R_(1)) = (6V)/(10 Omega) = 0.6 A`. Current through resistors, `R_(2) , I_(2)(V)/(R_(2)) = (6V)/(20 Omega) = 0.3 A`. Current through resistors,`R_(3) , I_(3)(V)/(R_(3)) = (6V)/(30 Omega) = 0.2 A`. (b)Total current in the circuit `I = I_(1) + I_(2) + I_(3) = 0.6 + 0.3 + 0.2 = 1.1A` (c )total EFFECTIVE resistance of the circuit, `R = (V)/(I) = (6V)/(1.1A) =(60)/(11) Omega = 5.5 Omega` 
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| 4363. |
(a) Hydrogen is used as a rocket fuel. Why ? (b) List two limitations of using solar cookers. |
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Answer» Solution :(a) HYDROGEN is comparatively a cleaner fuel than any other gaseous fuel, as on its burning only water is produced which does not pollute the environment. (b) (i) Cannot be USED in night/cloudy days. (II) DIRECTION of REFLECTOR has to be changed from time to time. |
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| 4364. |
Which reptiles are usually kept as pets , but it is against Wildlife Act ? |
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Answer» Turtles and TORTOISE |
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| 4365. |
An electric heater having resistance equal to 5 is connected to electric source. If it produces 180 J of heat in one second, find the potential difference across the electric heater. |
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Answer» SOLUTION :Given: RESISTANCE (R) = 5 `Omega`, Heat (H) produced per SECOND by heater= 180 J, time (t) = 1 s To find:Potential difference (V) Formula : `H=I^2Rt` Solution : We know that, `H=I^2Rt =(V/R)^2 Rt =(V^2t)/R` `THEREFORE V^2 ="HR"/t=(180xx5)/1 =900` `V=sqrt900`=30 Potential difference is 30 V |
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| 4366. |
__________ gives the definition of force as well as inertia. |
| Answer» SOLUTION :NEWTON's FIRST LAW . | |
| 4367. |
For an astronaut in a spaceship, the sky appears |
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Answer» white |
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| 4368. |
Application of Newton's law of gravitation helps to predict the path of the astronamical bodies. |
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| 4369. |
If we travel with the spped of light , it will take 1 second to reach the moon. |
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| 4370. |
Differentiatebetween short -circuitingand overloading . |
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Answer» Solution :Short -ciruiting: If the plasticinsulation of thelivewires come in neutralwire getseither directlyor via a conductingwire . Thisthouchingof the live wire and neutral wire is known as short -circuiting . In this case , the resistance of the circuit becomes almostzero. This results in the flow oflarge currentin the circuit . This heats up wiredangerously and may lead to FIRE. Overloading: The currentflowingin dometic wiringat a particular time depends on the powereletrical appliances of high POWER ratinge.g., electric iron , water heater , air- CONDITIONER , etc are switched on at the sametimetheydraw an extermelylargecurrent from the circuit . Thisis CALLED overloading . Thereforethe copper /aluminium wireof householdwiringget HEATED to a veryhightemperature . Thiscan lead to fire. |
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| 4371. |
In cold regions in winter, the rocks crack due to anomolous expansion of water. |
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Answer» Solution :1.In RAINY season, lot of water sweeps through numerous cracks and fissures in the rocks. 2. In winter season, when the TEMPERATURE falls below `4^@C` going down to `0^@C` EXPANSION of water TAKE place, thus developing a high pressure. 3. As the temperature falls further, water converts into large volume of ice. 4. This large volume of ice exerts a large pressure on the rocks. 5. This RESULTS in the breaking of the rocks in cold regions in winter. |
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| 4372. |
A constant volume thermometer using the gas reads a pressure of 1.75xx 10^(4) Pa at normal freezing of water and reads 2.39 xx 10^(4) pa at normal boiling point of water. Obtained from the observation the temperature of absolute zero on celcius scale. |
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Answer» <P> Solution :Let temperature on kelvin scale of freezing point of water =`=T_(1) K=2.93xx10^(4) Pa`Let temperature on kelvin scale of boiling point of water `=T_(2)=K=1.75xx10^(4) Pa` As volume is constant so by universal GAS law `PV=nRT`=as volume and mass of gas in thermometer constant, so `P prop T or (P)/(T)`= constant `(P_(1))/(T_(1))=(P_(2))/(T_(2))= or (T_(2))/(T_(1))=(P_(2))/(T_(1))=(2.39xx10^(4))/(1.75xx10^(4))=(239)/(175)` s `T=t_(C)+ tT_(0) ""...(i)` `T_(1)=0 +T_(0) "T_(2)= 100+T_(0)` `:. (100+T_(0))/(T_(0))=(239)/(175)` `(100)/(T_(0))+(T_(0))/(T_(0))=(239)/(175)` `(100)/(T_(0))=(239-175)/(175)` `:.(100)/(T)=(64)/(175)` `64T_(0)=100xx175` `T_(0)=(100xx175)/(64)=273` From (1) `t_(c)=T-T_(0)=0-273=-273K` |
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| 4373. |
Mention the types of mirrors used as (i) rear view mirrors (ii) shaving mirrors. List two reasons to justify your answer in each case. |
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Answer» Solution :(i) A convex mirror always forms an erect, VIRTUAL and diminished image of an object placed anywhere in front ofit. Thus, convex mirrors enable the DRIVER to view mush LARGER traffic behind him that would not be possible with a plane mirror. (ii) A concave MIRRORIS used as a shaving or MAKE up mirror because it forms ann erect and enlarged image of the face when it is held closer to the face. |
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| 4374. |
What does an electric circuit mean ? |
| Answer» SOLUTION :The ELECTRIC circuit is a CLOSED CONDUCTING path in which an electric current flows. | |
| 4375. |
Name the component of a solar cooker that produces a green house effect inside it. |
| Answer» SOLUTION :GLASS plate/sheet that COVERS the BOX. | |
| 4376. |
(a)In which respect does the construction of an A.C generator differ from that of a D.C. generator ? (b) What normally drives the alternators in a Thermal Power Station ? What fuels can be used to heat water in the boiler ? |
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| 4377. |
The tension in the string shown in figure m-2m to F is. |
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Answer» F/3 `ma =T...........(2)` |
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| 4378. |
The remains (or impressions) of dead animals or plants that lived in the remote past are known as : |
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Answer» EXTINCT species |
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| 4379. |
List in tabular form two major differences between an electric motor and a generator. |
Answer» SOLUTION :DIFFERENCE between ELECTRIC MOTOR and GENERATOR 
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| 4380. |
White light splits into its constituent colours when passed through a glass prism. Give the reasons for this type of splitting |
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| 4381. |
A cylindrical conductor of length 'I' and uniform area of cross-section 'A' has resistance 'R'. Another conductor of length 2.5 I and resistance 0.5 R of the same material has area of crosssection |
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Answer» 5A |
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| 4382. |
(i) How doesnuclear fission take place? |
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Answer» SOLUTION :(i) Innuclear FISSION, the atom of a heavy element is bombarded by a neutron to FORM an unstable ISOTOPE. (ii) The unstable isotope further splits into two or more smaller nuclei releasing extra NEUTRONS and energy. (iii) In nuclear fisson, huge amount of energy and heat is released. |
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| 4383. |
What do you mean by natural resources ? List its two main calegories. |
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Answer» Solution :Natural resources are COMPONENTS of biosphare and INCLUDE energy, air, land, water, minerals, plants, animals , and micro-organimms. The natural resources are categorised into two main groups i.e.Renewable and non-renewable. Classification of natural resources Depending on the availability and abundance, the natural resources are classified into FOLLOWING kinds. 1 Inexhaustible resources. These resources are not likely tobe exhausted by man.s consumption and other USES. 2 Exhaustible resources. These are the resources which are likely to be exhausted by man.s consumption. |
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| 4384. |
State the common characteristic of the following elements : Boron, Silicon, Germanium and Arsenic |
| Answer» SOLUTION :These ELEMENTS are METALLOIDS | |
| 4385. |
What are the cause of pollution of river Ganga ? |
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Answer» Solution :The causes of pollution of river Ganga are FOLLOWS : (i)DUMPING of garbage and untreated sewage from all the towns and cities on the bank of the river. (ii)Millions of people bathe and wash their clothes , animals and vehicles in the river WATER. (iii)Releasing chemical effuents from industries directly into the river water. (iii)Releasing chemicaleffuents from industries directly into theriver water. (iv)Immersion of ASHES or even dead BODIES in the river , performed as aritual. |
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| 4386. |
What are the water harvesting methods used in Maharashtra? |
| Answer» SOLUTION :BANDHARAS and TALS. | |
| 4387. |
The jungle in Kokilamukh of Jorhat district of Assam is well known as Molai jungle. |
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| 4388. |
Define emf. |
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Answer» Solution :Electromotiye force or emf is defined as the WORK DONE by the chemical force to move unit positive charge from negative terminal to pasitive terminal of the battery. `" emf "epsilon=(W)/(q)=(F_(E)d)/(q)` Where. `F_(e)` is electric force d is the distance between the terminals q is the charge The S.I unit of emf is 'Volt'. |
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| 4390. |
How is a current- carryingwire placed in a magneticfield so that amagneticfield doesnot act on it ? |
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Answer» PARALLEL to themagneticfield |
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| 4391. |
Explain the underiyingand working of an electric generator by drawing a labelled diagram. What is the function of brushes ? |
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Answer» Solution :Principle : An electric generator works on the principle of electromagnetic induction. When a coil is rotatedbetween the magnet or when the magnet is rotated in and out of the coil , a current is INDUCED in thecoil in a direction given by Fleming.sright-hand RULE. Construction: An AC electric generatorconsists of a rectangularcoil ABCD placed between two poles of a permanent magnet asshown in the figure. The ends of the coil are connected to rings `R_(1) and R_(2)` . The inner sides of the RING are insulated and are attachedto an axle. Theirouter side is made conducting and is in contact with two brushes `B_(1) and B_(2)`whichare connected to a galvanometerthrough wires. Working : The axle attached to the two rings is rotated such thearm AB moves up and arm CD moves down in the magnetic field produced by the permanent magnet, i.e., ABCD is rotated clockwise. Then, by Fleming.s right-hand rule, the inducedcurrents are set up in these arms and current flowsin the direction ABCD and from `B_(2) t o B_(1)` as indicated by deflection inthe galvanometer. After half a rotation, arm CD starts moving up and ABmoves down. Then, the induced current flows along DCBA, and from `B_(1) t o B_(2)`externally . After every half rotation the POLARITY of the currentchanges thereby producing alternating current (AC). Thus, the device is called an AC generator. The function of the brushes is to transmit current induced externally from coil ABCD to the external circuit. 
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| 4392. |
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass ? The speed of light in vacum is 3xx10^(8)m//s. |
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Answer» SOLUTION :Refractive index of a medium, `n_(m)=` speed of light in VACUUM, C `= 3XX10^(8)m//s`. Refractive index of glass V = speed of light in vacuum Refractive index of glass `= c//n_(g)` `=3xx10^(8)//1.50=2xx10^(8)m//s`. |
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| 4393. |
A body is acted upon by two unequal forces in opposite directions, but not in the same line. The effect is that: |
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Answer» (a) the body will only have ROTATION MOTION |
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| 4394. |
State whether work is done or not ,by writing yes or no,in following cases: (a) A man pushes a wall (b)A coolie stands with a box on his head for 15 min. (c )A boy climbs up 20 stairs. |
| Answer» SOLUTION :(a)No (B)No (C )YES | |
| 4395. |
Name the process of heat transmission. |
| Answer» SOLUTION :This process of transmission may be DONE in any of the ways LIKE conduction, CONVECTION, or radiation. | |
| 4396. |
The extent of change in the direction of light ray is related to the…………. Of medium. |
| Answer» SOLUTION :REFRACTIVE INDEX | |
| 4397. |
List any two advantages associated with water stored in the ground. |
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Answer» SOLUTION :Advantages of water stored in ground : (i)Recharges the ground water (ii)Prevents evaporation of water (III)Prevents BREEDING of mosquitoes (iv)Prevents contamination (V)Mitigates FLOOD and drought |
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| 4398. |
To find the image-distance for varying object-distance in case of a convex lens, a student obtains on a screen a sharp image of a bright object placed very far from the lens. After that he gradually moves the object towards the lens and each time focuses its image of the screen. (a) In which direction-towards or away from the lens, does he move the screen to focus the object? (b) What happens to the size of image - does it increase or decrease ? (c ) What happens when he moves the object very close to the lens ? |
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Answer» SOLUTION :(a) AWAY from the lens (b) Increases (C ) No image is formed on the SCREEN. |
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| 4399. |
Draw a diagram of the tube, showing the results of your activity. |
Answer» SOLUTION :
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| 4400. |
Uterus : |
| Answer» Solution :GROWTH and development of foetus during pregnancy. HELPING in PARTURITION (childbirth) by CONTRACTIONS. | |