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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.
| 5301. |
What is the principle of the working of the human eye? |
| Answer» Solution :It is like a camera having a lens system forming an INVERTED, REAL IMAGE on the light sensitive SCREEN, retina INSIDE the eye. | |
| 5302. |
The values of melting point, boiling point and latent heat depends on ............ |
| Answer» SOLUTION :ATMOSPHERIC PRESSURE | |
| 5303. |
SI unit of power is |
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Answer» dioptre |
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| 5304. |
(i) Define power of a lens and write its SI unit. (ii) A convex lens of power 4D is placed at a distance of 40 cm from a wall. At what distance from the lens should a candle be placed so that its image is formed on the wall? |
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Answer» Solution :(i) Reciprocal of focal length expressed in metres is called power. SI UNIT is dioptre. (ii) `F=(1)/(P)=(1)/(4D)=(1)/(4)m=25cm` `v=40m`. `(1)/(v)-(1)/(u)=(1)/(f)` `(1)/(u)=(1)/(v)-(1)/(f)=(-3)/(200)` `"or"u=(-200)/(3)cm` So candal should be placed 200/3 cm from the LENS. |
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| 5305. |
The nuclear energy is measured in Curie. |
| Answer» SOLUTION :The NUCLEAR ENERGY is MEASURED in MEV. | |
| 5306. |
How are the bread and other products produced using baker's yeast nutritious? |
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Answer» Solution :(1) In order to make the bread the BAKER's yeast - SACCHAROMYCES cerevisiae is added to the flour for the FERMENTATION PROCESS. (2) In commercial bakery, compressed yeast is used while in domestic settings dry, granular form of yeast is used. (3) The flour prepared by using commercial yeast contains various useful contents like carbohydrates, fats, proteins, various vitamins, and minerals. (4) The anaerobic fermentation also increases the nutritive CONTENT of the flour. (5) Due to this, bread and other products produced with the help of yeast become nutritive. |
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| 5307. |
An element X with atomic number 12 forms a compound with element Y with atomic number 17. The formula of the compound formed is |
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Answer» Group 1 and Period 3 |
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| 5308. |
Electrical reslstivities of some substances, In ohm- meter, at 20^(@) C are given as follows : Which substance is preferred to be used for electrical transmission lines ? Give reason. |
| Answer» SOLUTION :COPPER, ECONOMICAL/ LOW RESISTIVITY. | |
| 5309. |
Name the scientist in whose honour the SI unit of electric current is named. |
| Answer» SOLUTION :ANDRE AMPERE | |
| 5310. |
If a mirror has a focal length of + 15 cm, it is a |
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Answer» CONVEX mirror |
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| 5311. |
Which colour of the spectrum has (a) longest wavelength, and (b) shortest wavelength ? |
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Answer» |
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| 5313. |
Name the type of particles which acts as a prism in the formation of rainbow in the sky. |
| Answer» SOLUTION :WATER DROPLETS PRESENT in the ATMOSPHERE. | |
| 5314. |
Differentiate the following Monocot root and Dicot root |
Answer» Solution :(a) Monocot root and DICOT root  (B) AEROBIC and ANAROBIC respiration 
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| 5315. |
What is rust ? Give the equation for formation of rust . |
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Answer» Solution :When iron is exposed to moist AIR, it forms a layer of brown hydrated ferric oxide on its surface. This compound is known as rust and the PHENOMENON of FORMATION of rust is known as rusting. `4Fe+3O_(2)+xH_(2)Otounderset((Rust))(2Fe_(2)O_(3)).xH_(2)O` |
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| 5316. |
How many 176'Omega' resistors (in parallel)are required to carry 5 A on a 220V line? |
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Answer» Solution :Here, I = 5 A, V = 220 V So, the total resistance of the given circuit is `R_("total") = V/I =220/5 = 44 Omega` i.e., when `44Omega`resistance is connected with220 V line, 5 A current would flow through the given circuit. Now, SUPPOSE .n. resistors, each of resistance R, are required to be connected in parallel, so that the total resistance `R_("total")`becomes `44Omega`. Hence, `1/(R_("total")) = 1/R + 1/R +...n` times `=(1 + 1 + ...n" time")/R = n/R` `:.R_("total") =R/n` Now, `R_("total") =44 Omega and R = 176 Omega` So, `44 = 176/n` `:. n = 176/44 =4` Thus, 4 resistors each of `176 Omega` connected in parallel will RESULT in total resistance of `44 Omega` causing a current of 5 A to flow when connected to 220 V line. |
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| 5317. |
A piece of metallic wire of resistance R is cut into 3 equal parts. These parts are then connected in parallel. If the total resistance of this combination is R', then the value of R : R' is |
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Answer» `1:3` |
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| 5318. |
Figure alongside shows an equilateral prism ABC and the ray QR emerging out from the prism after suffering minimum deviation. Complete the diagram to show the refracted ray PQ inside the prism and the incident ray OP on the prism. State in words how have you completed the diagram to show the refracted ray PQ inside the prism and the incident ray OP on the prism. state in words how have you completed the diagram. |
Answer» Solution :The completed diagram is shown below in Figure.  . Way of drawing: (1) The REFRACTED ray PQ is drawn parallel to the base BC of the prism since the emergent ray QR has suffered MINIMUM deviation. (2) After drawing normals on face AB of prism at P and on face AC of prism at Q, the incident ray OP is drawn such that the angle of INCIDENCE `i_(1)` is equal to the angle of emergence `i_(2)`. |
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| 5319. |
Earthworm is called a friend of farmers. |
| Answer» Solution :(1) Earthworms move through the soil in the farms and fields. (2) They feed on the detritus in thesoil. They ALSO help in decomposition of the organic matter. (3) When the soil is LOOSENED DUE to their activities, the roots of the crops grow well. (4) They enrich the soil by their excretawhich act as fertilizers. Allthese facts make earthworm, a FARMER's friend. | |
| 5320. |
The convex lens always gives small virtual image. |
| Answer» Solution :Correct Statement :The CONVEX lens GIVE ENLARGED VIRTUAL image when it is PLACED between pole and principle focus. | |
| 5321. |
I am provided by the gravity of the earth. |
| Answer» SOLUTION :CENTRIPETAL FORCE | |
| 5322. |
The nuclear bomb dropped in Hiroshima and Nagasaki are___________. |
| Answer» SOLUTION :LITTLE BOY | |
| 5323. |
A crowbar 2 m long is pivoted about a point 10 cm from its tip. (i) Calculate the mechanical advantage of the crowbar. (ii) What is the least force which must be applied at the other end to displace a load of 100 kgf? |
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Answer» Solution :Given: L=100kgf, since load is at tip which is at distance 10 cm from the fulcrum, so load ARM=10 cm, Total length of crowbar=2 m=200 cm Effort arm=200-10=190cm, E=? (i) MECHANICAL ADVANTAGE=`("effort arm")/("load arm")=(190)/(10)=19` (ii) Taking moments about the pivot (fulcrum), `Exx190=100xx10` `E=(100xx10)/(190)=5*26kgf`. |
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| 5325. |
The distance of Neptune and Saturn from the sun is nearly 10^(13)m " and "10^(12)m respectively. Assuming that they move in circular orbits, then what will be the ratio of their time periods. |
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Answer» SOLUTION :By Kepler's IIIrd law `((T_n)/(T_s))^2= ((R_n)/(R_s))^3` `(T_n)/(T_5)= ((R_n)/(R_s))^(3/2)= ((10^(13))/(10^(12)))^(3/2)= 10^(3/2)` `=10sqrt(10)= 10xx3.16xx31.6` `T_n : T_s = 36.6 : 1`. |
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| 5326. |
Laughter club is a remedy to drive away ___________ |
| Answer» Solution :LAUGHTER CLUB is a remedy to drive AWAY stress. | |
| 5327. |
Deviation caused by a prism is maximum for violet coloured ray because wavelength of violet light is maximum. |
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Answer» |
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| 5328. |
List any four measures for conserving forests. |
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Answer» Solution :(i)Replenish the trees cut down for timber by planthing more trees so that there is no scarcity. (ii)Consumption of wood and charcoal should be discouraged . Instead , use CONVENTIONAL sources of energy such as BIOGAS. (iii)Deforestation should either BESTOPPED or REDUCED to minimum and should be followed by reforestation. (iv)Acute participation of local people NEED totakenfor the conservation of forests . |
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| 5329. |
Green house effect refers to |
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Answer» COOLING of earth |
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| 5330. |
Symbol of a resistor is………… |
Answer» SOLUTION :
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| 5331. |
Which factors affect the social health ? |
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Answer» Solution :i. The ABILITY of a person to establish relationship with other persons in the society is known as SOCIAL health. ii. The MAIN factors which disturb the cosial health of an individual are: a. Mental stress b. Addiction c. Incurable diseases d. Excessive use of modern technology III. Apart from these the other factors which affect the social health are: a. Education and financial status of people. b. Number of gardens and play grounds in the vicinity. c. Social and physical conditions of the surroundings. d. The type of residential area. e. Provision of water and availability of toilets f. Poliical conditions (views) G. Social treatment of people h. Social safety i. Transport facilities j. Education and bob opportunities k. Fulfilment of basic needs of people including food, clothing, shelter and medicines. |
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| 5332. |
Give reasons for the following:(i) Only one half of water molecule is shown in the formula of Plaster of Paris.(ii) Sodium hydrogen carbonate is used as an antacid.(iii) On strong heating, blue coloured copper sulphate crystals turn white. |
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Answer» SOLUTION :(i) Actually two formula units of `CaSO_4` share one molecule of water. Hence one formula unit shares half molecule of water. (ii) Sodium hydrogen carbonate is an alkaline substance. It NEUTRALISES excess acidity in the stomach. Therefore, it is used as an ANTACID. (iii) On heating, blue copper SULPHATE crystals lose water of crystallisation. Anhydrous copper sulphate is white. `underset(Blue)(CuSO_4"."5H_2O)overset(HEAT)rarrunderset(White)(CuSO_4"."5H_2O)` |
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| 5333. |
Disaster |
| Answer» Solution :A sudden accident, manmade deliberate avtivity or a NATURAL CATASTROPHIC event that cause GREAT DAMAGE or loss of LIFE is called a disaster. | |
| 5334. |
Why are copper and aluminium wires usually employed for electricity transmission ? |
| Answer» SOLUTION :Because they have LOW RESISTIVITY. | |
| 5335. |
A body covers half the distance with a speed of 20m/s the other half with a speed of 30m/s. The average velocity ogf the body during the whole journey is |
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Answer» zero `t_(2) = (S)/(u), "where" v=30m/s` `:. "Average VELOCITY" = (2S)/(t_(1)+t_(2))` `=(2S)/((S)/(u)+(S)/(v))=(2uv)/(u+v)` `=(2xx20xx30)/(20+30)` = 24m/s |
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| 5336. |
What is Asti gmatism? |
| Answer» SOLUTION :Astigmatism is the DEFECT of an eye DUE to which a person cannot focus on both the horizontal and vertical lines, simultaneously. The reason for this defect is irregularities on the SURFACE ofthe cornea . | |
| 5337. |
Time period of oscillation of a simple of a simple pendulum T = 2pi sqrt((I)/(g)). Measured value of I is 20.0 cm known to 1 mm accuracy and time for 100 oscillation of the pendulum is found to be 90 s. using a wrist watch of 1s resolution. The accuracy in the determination of g is |
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Answer» 0.02 |
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| 5339. |
(a) Explain why, it is more dangerous to touch the live wire of a mains supply rather than the neutral wire. (b) Why is it safe for birds to sit on naked power lines fixed atop tall electric poles ? |
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Answer» |
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| 5340. |
Effect of pressure in decreasing order_________,_______,________. |
| Answer» SOLUTION :GAS, LIQUID , SOLID | |
| 5341. |
Why do we observe these changes ? |
Answer» Solution :These changes are DUE to the point of observation. We know that earth is a sphere, the UPWARD direction of the vertical POSITION on its surface decisively depends upon the place on the earth's surface, where the vertical is DRAWN. 
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| 5342. |
A light ray in passing from water to a medium (a) speeds up, (b) slows down. In each case, (i) give one example of the medium, (ii) state whether the refractive index of medium is equal to, less than or greater than the refractive index of water. |
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| 5343. |
Tanrnayee from Std. X uses spectacles. The power of the lenses in her spectacles is-2.5 D. Answer the following questions: Find the focal length of the lenses used in her spectacles. |
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Answer» <P> Solution :As, `P=(1)/(f(m))``THEREFORE" "f=(1)/(P)=(1)/(0.5)=2 m` THUS, focal length of the lenses used in SURABHI's SPECTACLES is 2 m. |
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| 5344. |
Magnification produced by a rear view mirror fitted in vehicles |
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Answer» is less than ONE |
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| 5345. |
A copper sphere of 100 g mass is heated to raise its temperature to 100^@C and is released in water of mass 195 g and temperature 20^@C in a copper calorimeter. If the mass of calorimeter is 50 g, what will be the maximum temperature of water? |
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Answer» Solution :Given : Specific heat of copper =0.1 `"cal/g "^@C` Specific heat of calorimeter = 0.1 `"cal/g"^@C` Mass of copper sphere = 100 g Mass of water = 195 g Mass of calorimeter = 50 g Solution: Suppose the copper ball, water and the calorimeter ATTAIN final temperature T. Heat lost by solid OBJECT = heat gained by water in calorimeter + heat gained by calorimeter Here, heat lost by the copper ball = mass of the copper X specific heat of copper x decrease in temperature of ball Q=100 x 0.1 x (100-T) Similarly, Heat gained by the water = mass of the water x specific heat of water x increase in its temperature `Q_1 = 195 xx 1 xx x (T-20)` Heat gained by the calorimeter = mass of the calorimeter x specific heat x increase in its temperature `Q_2` = 50 x 0.1 x (T-20) Now, `Q=Q_1+Q_2` 00 x 0.1 x (100-T) = 195 x 1 x (T-20) + 50 x 0.1 x (T-20) 10(100-T)= 195 (T-20) +5(T-20) 10 (100 - T ) = 200 (T-20) 1000-10T = 200T-4000 210 T = 5000 `T=23.8^@C` The maximum temperature of water will be `23.8^@C` |
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| 5346. |
Whatis Unit force ? |
| Answer» SOLUTION :The amount of force requiredto produce an acceleration of ` 1 ms^(-2)` on in a BODY of mass 1 kg is called" unit force " . | |
| 5347. |
What is lens formula ? |
| Answer» SOLUTION :It is `1/f=1/v-1/u` | |
| 5348. |
What is mirage? |
| Answer» SOLUTION :Mirage is an OPTICAL illusion generally observed in HOT region DUE to total internal reflection. | |
| 5349. |
What is the minimum resistance which can be made using five resistors each of 1//5Omega? |
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Answer» `1//5Omega` |
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| 5350. |
I live in your small Intestine. Pseudocoelom is present in my thread like body . In which phylum will you include me ? |
| Answer» SOLUTION :I am ASCARIS. I am INCLUDED in ASCHELMINTHES. | |