InterviewSolution
Saved Bookmarks
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.
| 451. |
The rate of consumption of electric energy with time is called …………………. . |
| Answer» SOLUTION :ELECTRIC POWER | |
| 452. |
Wavelength of radiation to which our eyes are senstitve is between ………… and ………. |
| Answer» SOLUTION :400 NM, 700 nm | |
| 453. |
Colour of clear sky is blue due to : |
|
Answer» Reflection |
|
| 454. |
Define nuclear fission Give example. |
|
Answer» Solution :The process of breaking (splitting) up of a heavier nucleus into two smaller nuclei with the release of a large AMOUNT of energy and a few neutrons is called .nuclear FISSION.. E.g. Nuclear fission of a urani. m nucleus (`U^(235)`) `""_(92)U^(235)+ ""_(0)n^(1) to ""_(56)BA^(141)+ ""_(36)KR^(92)+ ""_(30)n^(1)+ Q`( energy) |
|
| 455. |
Vomiting centre is located in_____ |
|
Answer» Cerebrum |
|
| 457. |
What is the slogon of chipko moment ? |
| Answer» Solution :The SLOGAN of Chipko Movement is FIVE Fs - FOOD ,fodder , FUEL fibre and fertiliser . | |
| 459. |
What type of nuclear reaction is responsible for the liberation of energy : (a) in a nuclear reactor ? (b) in the sun ? |
|
Answer» |
|
| 461. |
When heat energy is lost by an object, DeltaT represents the fall in temperature. What would DeltaTrepresent if the object gains heat energy? |
| Answer» Solution : If the OBJECT gains heat ENERGY,`DELTAT` would represent the rise in its TEMPERATURE. | |
| 462. |
The equation of linear expansion is ____________. |
| Answer» Solution :`(DELTAL)/(L_(0)) = alpha_(L)DeltaT` | |
| 463. |
How will you explain following statements with the help of the anomalous behaviour of water?In regions with cold climate, the aquatic plants and animals can survive even when the atmospheric temperature goes below 0^(@)C. |
|
Answer» Solution :(i) In cold countries during winter, the temperature of air falls to `0^(@)C` or even below. (ii) As the temperature of air DECREASES, the water at the surface of the lake begins to contract due to which its DENSITY increases. (iii) When the temperature of the water falls below `4^(@)C`, due to its anomalous behaviour, the water expands instead of contracting. (iv) As the temperature of water falls to `0^(@)C`, the water on the surface of the lake gets converted to ice. (v) Since ice is a bad conductor of heat the water below the ice LAYER continues to remain at `4^(@)C` even though the temperature of air may fall below `0^(@)C`. (vi) HENCE, due to the anomalous behaviour of water, aquatic animals stay alive even when the temperature of air falls below `0^(@)C` . |
|
| 464. |
If the body of Sycon breaksup accidently into only large and few fragments, then only each fragment develops into new sycon. |
|
Answer» |
|
| 465. |
Antheridium of pteridiphytes can be compared to |
|
Answer» STAMEN of angiosperms |
|
| 466. |
State what would happen to the directionof rotation of the cell currentflowing through the coil is reversed . |
| Answer» SOLUTION :The DIRECTION of ROTATION of the CELL WOULD be reversed . | |
| 467. |
Common energy source in village is |
|
Answer» electricity |
|
| 468. |
During transition of solid phase to liquid, the object absorbs heat energy, but its temperature does not increase. This heat energy is utilised for ........... . |
|
Answer» TIGHTENING the bond |
|
| 469. |
Two resistors, with resistance 5 Omega and 10 Omega resistively are to be connected to a battery of emf 6V so as to obtain: (i) Minimum current flowing (ii) maximum current flowing (a) How will you connect the resistance in each case? (b) Calculate the strength of the total current in the circuit in the two cases. |
|
Answer» Solution :(a) (i) Here `R_1=5 Omega ,R_2=10 Omega and V=6V` (a) (i) For minimum current FLOWING in the circuit resistance `R_1 and R_2` should be connected in series. (ii) For maximum current flowing in the circuit resistances `R_1 and R_2` should be connected in PARALLEL. (B) (i) In series COMBINATION `R_s=R_1+R_2=5 Omega+10 Omega=15 Omega` `therefore` MInimum current `I_(min)=V/R_s=(6V)/(15 Omega)=0.4A` (ii) In parallel combination `1/R_p=1/5+1/10 implies R_p=10/3 Omega` `therefore` Maximum current `I_(max)=V/R_p=(6V)/(10/3 Omega)=1.8A` |
|
| 470. |
Who Will spend more electrical energy ? 500 W TV set in 30 mins, or 600W heater in 20 mins ? |
|
Answer» `THEREFORE"Energy "="Power"xx"time"` `E_(1)=500xx30xx60=900xx10^(3)J` For HEATER: Power = 600W, Time = 20 min = `20xx60s` `therefore"Energy "(E_(2))=600xx20xx60=720xx10^(3)J` COMPARING `E_(1) and E_(2), E_(1)gt E_(2)` `therefore"Energy spend by T.V. set "(E_(1))` is greater. |
|
| 471. |
From the elements Li, K, Mg, C, Al, S identify the element that forms acidic oxide. |
| Answer» SOLUTION :SULPHUR FORMS ACIDIC OXIDE. | |
| 472. |
State the function of a fuse' in an electric circuit. A circuit has a fuse of 5A. Find the maximum number of 100 W, 220 V lamps that can be used in this circuit. |
|
Answer» Solution : It prevents damage to the APPLIANCE due to overloading or SHORT circuiting `(P)/(V) = (1500 W)/(220 V) = 6.8` A Current rating (Maximum current ) = 5 A `therefore ` No of lamps = `("Current rating ")/("Current through one lamp") = (5)/((10)/(22))= 11. ` |
|
| 473. |
Chipko movement was stared in 1970s in a small village of Garhwal high up in Himalayas. Villagers stood against greedy contractors. Women folk hugged the trees. The Chipko movement (as it was called) spread slowly to all nearby areas under the leadership of Shri Sunder Lal Bahuguna. Answer the following questions based on the above information: (i) Do you feel inspired by this movement which prevented felling of trees? Who do you think are the real stakeholders? (ii) Which old belief has been challenged by Chipko movement? (iii) What values does Chipko movement invoke? |
|
Answer» Solution :(i) Yes. The local PEOPLE are the real STAKEHOLDERS. (ii) Chipko movement has challenged the old belief that forests are meant only for timber. Gift of TREES to us is soil, water, oxygen. (iii) Environmental PROTECTION, MOTIVATION for tree plantation. |
|
| 474. |
Suppose your parents have constructed a two room house and you want that in the living room there should be a provision of one electric bulb, one electric fan, a refrigerator and a plug point for appliances of power up to 2 kilowatt. Draw a circuit diagram showing electric fuse and earthing as safety devices. |
Answer» SOLUTION :CIRCUIT DIAGRAM is DRAWN here.
|
|
| 475. |
What is meant by saying that the electric potential at a point is Ivolt? |
| Answer» Solution :The POTENTIAL difference between two points A and B is I volt if one JOULE of wok has to be DONE in MOVING a positive charge of I coulomb from point A to point B. | |
| 476. |
Virtual image can be obtained on a screen. |
|
Answer» |
|
| 477. |
Define potential energy. |
| Answer» Solution :The ENERGY POSSESSED by an object because of its POSITION or shape is called itspotential energy. | |
| 478. |
Defineonecalorie. |
| Answer» Solution :One calorie is defined as the AMOUNT of heat energy REQUIRED to RISE the temperature of 1 GRAM of water through `1^(@)C` | |
| 479. |
Observer the following picture and describe the type of reproduction shown in . |
Answer» SOLUTION : The figure shows regeneration . The process of regeneration cannot be called , type of reproduction . But some primitive organisms such as PLANARIA use this method for procreation . Planaria breaks up its body into two parts . Each part has the ability to DEVELOP the lost part by process of regeneration . This forms two new Planaria . In DEVELOPED ANIMALS like wall lizard the process of regeneration is used to restore the lost parts like tail or limbs . |
|
| 480. |
A fissionable material is a ___________ element. |
| Answer» SOLUTION :RADIOACTIVE | |
| 481. |
What is the importance of hydropower plants in India ? |
| Answer» Solution :Importance of hydropower PLANTS: In India, a QUARTER of the energy comes from FLOWING water. High-rise dams are CONSTRUCTED on the rivers to collect water in large reservoirs. As the water level rises in the RESERVOIR, the kinetic energy of the flowing water gets transformed into potential energy | |
| 482. |
Newton's laws are applicable in |
|
Answer» for a body is at REST |
|
| 483. |
How does the resistance (R) of a wire depend upon its radius (r)? |
|
Answer» Solution :As `R prop 1/A prop 1/(PI r^2) ( :. A =pi r^2)` `:.R prop 1/r^2 ( :.pi = " CONSTANT")` |
|
| 484. |
When length of a wire is doubled its resistance as well as resistivity are doubled. |
| Answer» SOLUTION :False- When length of a wire is a DOUBLED, its resistance is doubled but its RESISTIVITY REMAINS UNCHANGED. | |
| 485. |
A charge of 12 coulomb flows through a bulb in 5 second. What is the current through the bulb ? |
| Answer» Solution :Excess secrestion of growth HORMONE (GH) in adults LEADS to abnormal enlargement of head, face hands and feet. This condition is called Acromegaly. | |
| 486. |
A magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? Support your answer with a reason. |
| Answer» Solution :If the current in the wire is increased, the deflection increases. The STRENGTH of magnetic FIELD is directly PROPORTIONAL to the magnitude of current passing through the STRAIGHT conductor. | |
| 487. |
{:("1.Charge of each alpha particle", (a) gamma"ray"), ("2. Charge of each beta particle", "(b) +2e"), (3. "Penetration power is maximum", (c) alpha "ray"), (4."Ionisation power is maximum", "(d)zero"):} |
| Answer» Solution :1. (B)+2e 2. (d) zero 3. (a) `gamma` RAY 4. (c)`alpha` ray | |
| 488. |
Electrical energy can develop ___________ across a resistor. |
| Answer» SOLUTION :POTENTIAL DIFFERENCE | |
| 489. |
State the principle of homogeneity. Test the dimensional homogeneity of equations— S_(n)=u+(a)/(2)(2n-1) |
|
Answer» Solution :`S_(n)` =Distance TRAVELLED in `n^(TH)` SEC that is `(S_(n)-S_(n-1))` `therefore S_(n)=uxx1+(a)/(2)(2n-1)` `[LT^(-1)]=[LT^(-1)]+[LT^(-2)][T]` `[LT^(-1)]=[LT^(-1)]` L.H.S.= R.H.S. Hence this is dimensionally correct. |
|
| 490. |
Transport facilities Social security Counselling, Toilets. |
| Answer» Solution :COUNSELLING.(All other are factors affecting SOCIAL health. Counselling is the positive MEASURE for mental health) | |
| 491. |
State the principle of homogeneity. Test the dimensional homogeneity of equations— s=ut+(1)/(2)at^(2) |
|
Answer» Solution :Dimension of L.H.S. = `[s]=[M^(0)L^(1)T^(0)]` Dimension of R.H.S. = `[ut]+[at^(2)]` `=[LT^(-1).T]+[M^(0)L^(1)T^(-2).T^(2)]=[M^(0)L^(1)T^(0)]` as Dimensions of L.H.S. = Dimensions of R.H.S. `therefore` The EQUATION to dimensionally HOMOGENEOUS. |
|
| 492. |
IUCN (International Union for Conservation of Nature) : |
| Answer» SOLUTION :IUCN prepares the 'Red LIST' which contains the names of the endangered SPECIES from different parts of the world. They help to PROTECT and conserve biodiversity. | |
| 493. |
Draw the ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed (i) at 2 F_(1), (ii) between F_(1) and optical centre O of the lens. |
Answer» Solution :(i) When the object AB is placed at `2F_(1)`, the IMAGE A'B' FORMED at `2F_(2)` is real, inverted and of same SIZE as the object, as shown in the ray DIAGRAM in Fig.  (ii) When the object AB lies between `F_(1)` and OPTICAL centre O of convex lens, the image A'B' is formed on the same side of the lens as the object. The image is virtual, erect and magnified as shows in the ray diagram 
|
|
| 494. |
In a circuit if two resistors of 4 Omega and 8 Omegaare connected in parallel, find out the ratio of current passing through the two resistors. |
|
Answer» Solution :`R_(1)=4 Omega` `R_(2) Omega` Potential DIFFERENCE =V `I_(1) = (V)/(R_(1))=(V)/(4Omega)` `I_(2)= (V)/(R_(2))=(V)/(8 Omega)` `(I_(1))/(I_(2))= (V//4)/(V//8)` or `(I_(1))/(I_(2))=(8)/(4)` or `(I_(1))/(I_(2))=(2)/(1)` `:. I_(1): I_(2)= 2:1` |
|
| 495. |
Name the device used to prevent damage to the electrical appliances and the domestic circuit due to overloading. |
| Answer» SOLUTION :ELECTRIC FUSE. | |
| 496. |
The mean transitional kinetic energy of a perfect gas molecule at absolute temperature T is (k is the Boltzmann constant) |
| Answer» SOLUTION :`(3)/(2)RT` | |
| 497. |
Skin : Keratin : : Blood : ……. |
| Answer» SOLUTION :HAEMOGLOBIN | |
| 498. |
Define temperature. |
| Answer» Solution :TEMPERATURE is defined as the DEGREE of HOTNESS of a BODY. | |
| 499. |
1 g of copper powder was taken in a China dish and heated. What change takes place on heating ? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name and the colour of the products formed in each case. |
|
Answer» Solution :The SURFACE of copper powder becomes black. This is due to formation of copper oxide. `2CU + O_2 overset(Heat)rarrunderset((black))underset("Copper oxide")(2CuO)` When hydrogen is passed over copper oxide, the black SUBSTANCE turns BROWN due to the formation of copper. `CUO + H_2 rarrunderset(("Copper Brown"))(Cu) + H_2O` |
|
| 500. |
To which phylum does Cockroach belong ? Justify your answer with scientific reasons . |
|
Answer» Solution :(1) CocKroach BELONGS to the PHYLUM Arthropoda and class Insecta. (2) Scientific reasons for placement of Cockroach in the phylum Arthropoda: (a) The body is covered by chitinous exoskeleton . (b) Jointed APPENDAGES present , three pairs of walking legs and two pairs of membranous wings. (C) Body is eucoelmate , triploblastic , bilaterally segmented and segmented . (d) Respiration by spiracles and tracheal TUBES. |
|