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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.
| 7951. |
Temperature is a property which determines |
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Answer» amount of HEAD of BODY contains |
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| 7952. |
Choose the appropriate set of apparatus for performing the experiment to determine the equivalent resistance of two resistors when connected in series : |
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Answer» Voltmeter, AMMETER, Two resistors, Key, Battery |
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| 7953. |
Draw neat and labelled diagrams. Energy transformation in solar thermal electric energy generation. |
Answer» SOLUTION :
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| 7956. |
Temperature is the average ___________ of themolecules of a substance |
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Answer» DIFFERENCE in K.E. and P.E |
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| 7957. |
Human evolution began approximately 7 crore years ago. |
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Answer» Solution :Human evolution took place in TIME period of about 7 crore years. According to this concept the journey of human evolution is as follows: (1) Approximately around 7 crore years back the ice AGE began on the earth. In such conditions, dinosaurs became extinct. The evolution and diversity of mammals started during this time. Due to CHANGE in climate the forest cover also declined rapidly. (2) Ancestors of monkey-like animals were Lemur like animals which evolved during this time period. (3) The tails of these monkey-like creatures started vanishing very gradually around 4 crore years ago. (4) The body and brain both increased in volume forming FIRST ape like animals. The monkey like ancestors gave rise to two evolutionary links to apes and human like animals. (5) Later, the human evolution took place by changes in the brain volume, the ability to walk upright, excessive use of hand for manipulations. (6) This journey of human evolution began 7 crore years ago. But the true wise and intelligent man arose around 50,000 years ago. |
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| 7958. |
Saving for the rainy day' is a popular proverb which means saving something for the times when it may not be available. Examine the practice of 'Rain water harvesting'. Answer the following questions based on the above situation: (i) Explain briefly the term 'Rain water harvesting'. (ii) Which values are promoted through the practice of rain water harvesting? (iii) Suggest two activities on the part of the school to promote this practice. How can these activities promote environmental values in the community? |
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Answer» Solution :(i) To collect and conserve rainwater during time when it is available in plenty and use it LATER. (ii) CONSERVATION of natural resources/Ecological BALANCE. (iii) Undertaking projects in the SCHOOL for water HARVESTING practice/Spreading awareness in the community and promoting this practice amongst masses. |
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| 7959. |
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child suffering from? How can it be corrected? |
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Answer» Solution :Myopia on short-sightedness : Inability of an eye in viewing long distance objects. The image in this case FALLS before the retina. For every myopic eye, there EXISTS a far point beyond which CLEAR image cannot be seen. The short-sightedness is corrected by using a CONCAVE lens which diverges and SHIFTS the image to the retina. 
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| 7960. |
Show four different ways in which three resistors of Rohm each may be connected in a circuit. In which case is the equivalent resistance of the combination. i] Maximum ii] Minimum |
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Answer» Solution :The four different ways in which resistors of Rohm can be connected are as follows: i] series connection II] Parallel connection iii] 2 resistors in series and one in parallel iv] 2 resistors in parallel and one in series  Equivalent RESISTANCES in each CASE is i] `R/3` ii] 3R iii] `(2R)/3` iv] `(3R)/2` HENCE, the MAXIMUM resistance is in case (ii) and minimum is in case (i). |
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| 7961. |
There are 10000 turns in a trànsformer. Voltage in the primary is 0.2A. The transformer is wound so as to get a current 0.4A in the secondary. What type of transformer is this? |
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| 7962. |
Process that occurs in the cytoplasm : Glycolysis : : Process that occurs in the mitochondria : ….. |
| Answer» SOLUTION :KREBS CYCLE | |
| 7963. |
Find the power of a concave lens of focal length 2 m. |
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Answer» Solution :Given that FOCAL LENGTH of CONCAVE lens f = -2 m `therefore` Power of concave lens `P = (1)/(f) = (1)/((-2 m)) = -0.5 D` |
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| 7964. |
Match IV {:("1. Uncontrolled fission reaction", "(a) Hydrogen Bomb"), ("2. Fertile material", "(b) Nuclear reactor"), (3. "Controlled fission reaction", "(c) Breeder reactor"),(4. "Fusion reaction" , "(d)Atom bomb"):} |
| Answer» SOLUTION :1. (1) Atom bomb2. (c) BREEDER reactor3.(b) Nuclear Reactor 4(a) Hydrogen BOMB | |
| 7965. |
Which hazardous radiation is the cause for the genetic disease ? |
| Answer» Solution :`gamma` ray (Gamma ray) or any high energy nuclear PARTICLE passes through human being, it DISRUPTS the entire normal functioning of the biological system and the effect MAY be EITHER PATHOLOGICAL or genetic disease. | |
| 7966. |
A particle is projected at an angle of 60^(@) to the horizontal with a kinetic energy E. The kinetic energy at the highest point is |
| Answer» Solution :K.E. at HIGHEST point `=1/2m(4 cos 60^(@))^(2)=E/4` | |
| 7967. |
Concept-diagram using factors harming the social health and based on it, answer the following questions : (ii) How the tobacco products are harming the social health? |
| Answer» Solution :Tobacco iscarcinogenic products.By its consumption personal and social HEALTH is affected on a LARGE scale. SPITTING tabcco anuwhere is also common practice AMONG tobacco chewers,This too affects public hygienic and cleanliness | |
| 7968. |
Concept-diagram using factors harming the social health and based on it, answer the following questions : (i) Tobacco products can be included in which of those factors? |
| Answer» SOLUTION :TOBACCO PRODUCTS are INCLUDED under ADDICTION. | |
| 7969. |
What are the speical feature of acommerical electricmotor ? |
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Answer» Solution :(1) A commericalmotor uses an electromagnetin place of a permanent magnet . (2) It has LARGE number of turnsof the conducting wire in THECURRENT - carryingcoil . (3) It has a soft IRON coreon whichthe coil WOUND . Thesoft ironcoreon whichthe coil is wound plusthe coils is called an armature . This enhances the power of the motor . |
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| 7970. |
The working of electric fuse is based on the ... |
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Answer» chemical EFFECT of ELECTRIC current. |
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| 7971. |
Do you know the voltage of mains that we use in our household circuits ? |
| Answer» Solution :YES, I KNOW the voltage of mains that we USE in our household CIRCUIT is 120 V. | |
| 7972. |
The equivalent resistances of a series combination of two resistances is X Omega. If the resistances are of 10 Omega and 40 Omega respectively. The value of X will be: |
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Answer» `10 OMEGA` |
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| 7973. |
An isotope of _______________ is used in many industries as a smoke detector. |
| Answer» SOLUTION :AMERICIUM `(Am^(241))` | |
| 7974. |
When does an electric short circuit occur? |
| Answer» SOLUTION :When live wire and neutral wire MAY come in direct CONTACT or insulation of wires used in an electrical circuit is damaged or there is a fault in the appliance, then the CURRENT in the ircuit abruptly rises and short-circuiting occurs. | |
| 7975. |
Arrange in descending order, on the basis of their penetration power Alpha rays, beta rays, gamma rays, cosmic rays |
| Answer» Solution : GAMMA RAYS, beta rays, alpha rays, COSMIC rays. | |
| 7976. |
The imasge formed by a concave mirror is observed to be virtual, erect and larger than the object where should be the position of the object relative to the mirror? Draw ray diagram to justify your answer. |
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Answer» <P> SOLUTION :When the object is located between the focus (F) and the POLE (P) of the mirror, the image is formed BEHIND the mirror,, this image is virtual, erect and large
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| 7977. |
Complete the following chart. |
Answer» SOLUTION : 
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| 7978. |
The statements given below are related to a stepdown transformer. Tabulate them as those related to primary and secondary. i) Winding with thick wire ii) Current flowing at higher voltage. iii) Winding with thin wire. iv) current flowing at a low voltage. |
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| 7979. |
What types of forces are you familiar with ? Also give examples |
| Answer» Solution :The gravitational force between the earth and the MOON, the electromagnetic force between TWO charged PARTICLES in motion, the nuclear force between a proton and a neutron in the NUCLEUS of an atom. | |
| 7980. |
What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce consumption? |
| Answer» Solution :Industrialization increases the demand for energy that fulifil this demand. The increased USE of fossil fuels has a harsh effect on the environment. Too much exploitation of fossil fuel increases the level EU of greenhouse gas content in the atmosphere, RESULTING in global warming and a RISE in the sea level. It is not possible to completely reduce the consumption of fossil fuels , However , some measures can be taken such as using electrical appliances wisely and not wasting electicity, unneccessary USAGE of water should be avoided, public transport system with mass transit must be adopted on a large scale , These small steps MAY help in reducing the consumption of natural resources and conserving them. | |
| 7981. |
Magnitude of force experienced by an object moving with speed v is given by F = kv^(2). Find dimensions of k. |
| Answer» SOLUTION :`[K]=([F])/([v^(2)])=(M^(1)L^(1)T^(-2))/([LT^(-1)]^(2))=(M^(1)L^(1)T^(-2))/(M^(0)L^(2)T^(-2))=[M^(1)L^(-1)]` | |
| 7982. |
Use your brain power : Animals like ghariyal and crocodile live in water as well as on land. Are they amphibians or reptiles ? |
| Answer» SOLUTION :Ghriyal and crocodile are reptiles . They can swim in WATER and crawl on land . But they can respire only with the help of lungs. Their breathing is through nostrils. EVEN when in water, they have to inhale and exhale by coming up to the surface of water of air . Amphibians can breathe through the skin when in water and by lungs when on land . They also have hard EXOSKELETON which amphibians do not have . GHARIYAL and crocodile cannot do so, hence they are not amphibians , but they are reptiles. | |
| 7983. |
Your image in bathroom mirrors results from _______ |
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Answer» Diffuse reflection |
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| 7984. |
In a two stage launch of a satellite, the first stage brings the satellite to a height of 150 km and the 2^(nd) stage gives it the necessary criticalspeed to put it in a circular orbit. Which stage requires more expenditure of fuel? Given mass of earth =6.0xx10^(24)kg radius of earth =6400 km. |
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Answer» Solution :Work done on SATELLITE in first state `=W_(1)=PE` at 150 km -PE at the surface `W_(1)= (GMm)/(R+h)-(-(GMm)/(R ))` `=(GMmh)/(R(R+h))` Work done on satellite in `2^(nd)" stage "W_(2)` = energy REQUIRED to GIVE orbital VELOCITY `v_(0)` `=(1)/(2)mv_(0)^(2)= (1)/(2)((GMm)/(R+h))` `(W_1)/(W_2)=(2h)/(R )= (2xx150)/(6400)= (3)/(64) lt 1` `W_2 gt W_1`, so second stage require more energy. |
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| 7985. |
Whatare SatelliteLaunch Vehicles ? Explaina SatelliteLanuchVehile developedby ISRO withthehelpof schematicdiagram . |
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Answer» Solution :(i) Satellite lauch vehicle are usedto placethe satelliteint theirspecificorbits . The functioningofthesatellitelaunchvehicleis basedon theNewton'sthirdlaw of motion. (ii) The launchvehicle uses specifictypeof fuel. (iii)The gasproduced due to combustionof the fuelexpands due to itshightemperatureand isexpelled forcellu throughtthe nozzelsat therear of thelaunch vehicle. (iv) Asa reactionof this ,a thrust actson the vehicle, whichdrives thevehiclehighintothe space. (v) The structure of the launch vehicle is decided by the weight of the satellite and the type of satellite orbit.  (vi) The fuel forms a major portion of the total weight of the launch vehicle. (vii) To overcome this problem, launch vehicles with more than one stages are used. Due to this, the weight of the vehicle can be reduced step by step, after its launching. (viii)For example, consider a launch vehicle having two stages. For launching the vehicle, the fuel and engine in the first stage are used. This imparts a SPECIFIC velocity to the vehicle and takes it to a CERTAIN height. (ix) Once the fuel in this first stage is EXHAUSTED, the empty fuel tank and the engine are DETACHED from the main body of the vehicle and fall EITHER into a sea or on an unpopulated land. (x) As the fuel in the first stage is exhausted, the fuel in the second stage is ignited. (xi) Since, the vehicle now contains only one stage, the weight has now been reduced and the vehicle can move with higher speed. Almost all vehicles are made of either two or more stages. (xii)As an example, Polar Satellite Launch Vehicle (PSLV). |
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| 7986. |
Whatisbluevitriol |
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Answer» Solution :(a) Copper `LARR` SULPHATE `larr` Pentahydrate `CuSO_(4).5H_(2)O` (BLUE vitriol) (a) Magnesium `larr` Sulphate `larr` Heptahydrate `MgSO_(4).7H_(2)O` (Epsom (salt) |
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| 7987. |
An electric lamp of 100Omega , a toaster of resistance 50Omega, and a water filter of resistance 500Omega are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances and what is the current through it? |
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Answer» SOLUTION :`1/R=1/100+1/50+1/500=(5+10+1)/500=16/500` `R=500//16=31.25Omega` `I=V//R=220//32.25=7.04A`. |
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| 7988. |
Heat change involved during transformation of state. |
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Answer» SOLUTION :HEAT CHANGE `= m xx L` where, m=mass of SUBSTANCE, L = Latent heat of for substance. |
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| 7989. |
The following apparatus is available in a laboratory. Cell:Adjustable from 0 to 1.5 volt Resistor:4Omega and 12Omega Ammeters:A_(1) of range 0 to 3 A, Least count 0.1 A A_(2) of range 0 to 1 A , Least count 0.05 A Voltmeters:V_(1) of range 0 to 10 V, Least count 0.5 V V_(2) of range 0 to 5 v, Least count 0.1 V Find the best combination of ammeter and voltmeter for finding the equivalent resistance of the resistors. |
| Answer» Solution :The overall RANGE of the VOLTAGE is from 0 to 1.5 V and that of CURRENT is from 0 to `(1.5)/(3)A=0.5A` . We, THEREFORE, prefer instrument that cover these ranges and also have a better least count. | |
| 7990. |
Powdered CaCO_(3) reacts more rapidly than flaky CaCO_(3) because of ......... |
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Answer» LARGE SURFACE AREA |
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| 7991. |
Draw a ray diagram to show the path of the reflected ray in each of the following cases. A ray of light incident on a convex mirror. (i) Strikes at its pole making an angle theta from the principal axis. (ii) Is directed towards its principal focus. (iii) Is parallel to its priciple axis. |
Answer» SOLUTION : 
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| 7992. |
A body of mass 5 kg is taken to the centre of the earth. What will be its Mass. |
| Answer» SOLUTION :MASS does not CHANGE. | |
| 7993. |
A person is advised to wear spectacles with convex lenses What types of defect of vision is he suffering from? |
| Answer» SOLUTION :HYPERMETROPIA or FAR- SIGHTEDNESS | |
| 7994. |
Explain the term polymerization with an example. |
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Answer» Solution :The reaction by which monomer molecules are CONVERTED into a polymer is called polymerization. A macromolecule formed by regular repetition of a small unit is called polymer. The small unit that repeats regularly to form a polymer is called monomer. The IMPORTANT method of polymerization is to make a polymer by joining alkene type of monomers. (2) Whenethylene GAS is heateed at high pressure and high temperature INT the presence of suitable catalyst, it polymerizes to form polyethylene or POLYTHENE (plastic).  ...`CH_(2)-CH_(2)-CH_(2)_CH_(2)_CH_(2)_`... etc.(3) The polymer polystyrene is used to make thermocoal articles. The polymer polyvinyl chloride is used to make P.V.C. pipes,doormats, etc. The polymer teflon is used to make nonstick cookware. THe polymer polypropylene is used to make injection syringe, furniture, etc. |
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| 7995. |
The magnetic field in a given region is uniform . Draw a diagram to represent it. |
Answer» SOLUTION :If the MAGNETIC fieldin a region is UNIFORM, it is representedbyequidistantparallel LINES as shown in the figure .
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| 7996. |
Walls of auditorium should be |
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Answer» GOOD ABSORBER |
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| 7997. |
Define weightlessness. |
| Answer» Solution :Whenever a BODY or a person falls freely under the action of Earth.s GRAVITATIONAL FORCE alone, it APPEARS to have zero weight. This state is referred to as .weightlessness.. | |
| 7998. |
A current of 1A flows in a series circuit containing an electric lamp and a conducor of 5 Omega connected to a 10V battery. Calculate the resistance of the electric lamp. Now if a resistance 10Omega is connected in parallel with this series combination, what change (if any)incurrent flowing through 5Omega conductorand potential difference across the lam will take palce ? Give the reason. |
Answer» Solution : As, `I =E/(R_1 +R_2)` `1 = 10/(x +5)` `or ` `:.x = 5Omega` is the resistance of the lamp. When a resistor of resistace `10 Omega` is connected in PARALLEL with `x + 5 = 10Omega`, the total resistance `R_p` of the ARRANGEMENT is given by, `1/R_p = 1/10 + 1/10` `=1/5` `:. R_p =5 Omega` `:.` The current in circuit `= E/(R_p)` `=10/5` `=2A` This current (2A) divides equally between `10 Omega ` and (resistance of lamp + `5 Omega`).  `:.` The current through THET lamp will be again 1A, i.e.,it remains the same. The potential difference across the lamp will be `1XX x = 1 xx 5 = 5V` Therefore, the potential difference across the lamp will remain the same. |
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| 7999. |
Name the type of energy possessed by the bob of a simple pendulum when it is at (a) the extreme position, (b) the mean position, and (c) between the mean and extreme positions |
| Answer» SOLUTION :(a) POTENTIAL ENERGY. b) KINETIC energy (c) BOCH Kinetic and potential energy | |
| 8000. |
For an object projected upward with a velocity v_(0) , which comes back to the same point after some time, draw (i) Acceleration-time graph (ii) Position-time graph (iii) Velocity time graph |
Answer» SOLUTION :
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