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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.
| 551. |
A satellite revolves close to the surface of a planet. How is its orbital velocity related with escape velocity of that planet. |
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Answer» SOLUTION :`v_e = SQRT(2) v_(0)` `:. ""v_e= sqrt((2GM)/(R ))" and "v_(0)= sqrt((GM)/(R ))` when r=R. |
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| 552. |
Among the following materials ……….. Has the highest refractive index. |
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Answer» Kerosene |
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| 553. |
The efficiency of carnot engine depends on |
| Answer» Solution :`ETA= 1 – T_2//T_1` . On the TEMPERATURE of SINK and SOURCE. | |
| 554. |
The essential difference between an AC generator and a DC generator is that |
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Answer» AC generator has an electromagnet while a DC generator has permanent magnet. |
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| 555. |
A concave mirror produces three times magnified (enlarged) real image of an object placed at 10cm in fron of it. Where is the image located? |
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Answer» SOLUTION :u=-10cm m=-3 V=? `m=-v/u` `-v=-3xx-10` `-v=30` `v=-30cm` Image is formed at 30 cm in FRONT of the concave mirror. |
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| 556. |
A concave mirror of focal length f (in air) is immersed in water (mu = 4/3). The focal length of the mirror in water will be |
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Answer» `(F)/(3)` |
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| 557. |
Draw a sketch of the pattern of field lines due to a: (a) current flowing into a circular coil, (b) solenoid carrying current. |
Answer» SOLUTION :
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| 558. |
The colour of LED will depend on the type of. . . . . . . . . . . Used. |
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Answer» CIRCUIT |
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| 559. |
a) What is Tyndall effect? Give two examples for Tyndall effect. b) What is the meaning of power of accommodation of eye? How does this help us to see objects at different distances? |
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Answer» Solution :(a) The scattering of light by the particles in a colloidal medium is called Tyndall effect. Examples : Sunlight passing through a dense forest. Focusing a beam of red light-in milk. Passing a blue light to a dark ROOM. (b) The ability of eye to focus both near and distant objects, by adjusting the focal length is called power of accommodation of the eye. When the ciliary muscles are RELAXED, the eye lens becomes thin, the focal length increases and the distant objects are clearly visible to the EYES. To see the near by objects clearly, the ciliary muscles contract making the eye lens thicken. THUS the focal length of the eye lens decrease and the near by objects BECOME visible to the eyes. Hence the human eye lens is able to adjust its focal length to view both distant objects |
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| 560. |
The animals called predators have : |
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Answer» both the eyes on the sides |
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| 561. |
The ratio of SI to cgs units of magnetic field is |
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Answer» `10 ^(4)` |
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| 562. |
To drive the turbine we need a generator. |
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Answer» |
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| 563. |
Study the following procedure and answer the question below : 1. Take 3 spheres of iron , copper and lead of equal mass. 2. Put all the 3 spheres in boiling water in a beaker for some time. 3. Take 3 spheres out of the water. Put them immediately on a thick slab of wax. 4. Note the dept that each sphere goes into the wax. (i) Which property of a substance can be studied with this procedure ? ltbr. (ii) Describe that property in minimum words. (iii) Explain the rule of heatexchange with this property. |
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Answer» Solution :(i) SPECIFIC heat. LTBR. (ii) Specific heat`:` The amount of heat energyrequired to raise the temperature of a unit mass of an object by `1^(@)C ` . (ii) Accordiing to the rule `/` principle of heat exchange , heat energy lost by the hot object = heat energy gained by the cold object. In this activity , heat absorbed by the iron sphere is transmitted more in the wax,hence the sphere goes deepest into the wax, while the LEAD sphere goes deepest into the wax, whilethe lead sphere absorbs less heat, resulting in less transmission of heat in the wax, hence the sphere goes the least depth into the wax. |
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| 564. |
Among the statements given below select the ones that correctly describes the concept of sustainable development (i) planned growth with minimum damage to the environment. (ii) growth irrespective of the extent of damage caused to the environment. (iii) stopping all development work to conserve the environment. (iv) growth that is acceptable to all the stakeholders. |
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Answer» (i) and (iv) |
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| 565. |
Haveyou seen that objects beyond and above a holi fire appear to be shaking? |
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Answer» Solution :1. Local atmospheric conditions affect the refraction on light. 2. The air NEAR holi flames is hot and hence rarer than the air aboveit. 3 The refractive indexof air keep increasing and the direction of light rays coming from objects BEYOND the holi fire changes DUE to changing refractive index above the fire. 4. Thus, the objects appear to be MOVING. |
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| 566. |
When a pin of height 4 cm is fixed at 10 cm from a convex lens, the height of the virtual image formed is 16 cm . Find the focal length of the lens. |
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Answer» SOLUTION :DATA : Convex lens, Convex lens , `h_(1)=4 cm , ` `h_(2)=16 cm` (virtual IMAGE ) , `u=-10CM, f=?` `(h_(2))/(h_(1))=v/u` `therefore (16 cm)/(4 cm) =(v)/(-10cm)=(1)/(10cm)-(1)/(40cm)` `=(4-1)/(40cm) =(3)/(40 cm)` `therefore f=(40)/(3)` cm =13.33 cm(approximately) |
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| 567. |
If fallen foliage in forest, dead trees, and carcasses in and around villages had not been decomposed for years "…....................." |
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Answer» Solution :i. If fallen foliage in forest, DEAD trees, and carcasses in and around VILLAGES had not been decomposed for years, they will remain as it is in nature. ii. Complex carbon SUBSTANCES from fallen foliage in forests, dead trees,carcasses, ETC., are converted to simpler carbon compounds by decomposers. iii. Due to decomposition, these carbon compounds easily mix with air, WATER and soil from where they are again absorbed by plants and incorporated into the food chain. iv. If these materialare not decomposed by decomposers, recycling of various compounds from biotic to abiotic components won't be possible and the ecological balance would be disturbed. |
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| 568. |
A nuclear reaction is represented by the following equation :._(92)^(235)U + ._(0)^(1)n rarr ._(56)^(139)Ba + ._(36)^(94)Kr + xc + E (a) Name the process represented by this equation and describe what takes place in this reaction.(b) Identify the particle c and the number x of such particles produced in the reaction.(c ) What does E represent ? (d) Name one installation where the above nuclear reaction is utilised. (e) What type of bomb is based on similar type of reactions ? |
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| 569. |
Which type of cancer affects lymph nodes and spleen ? |
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Answer» CARCINOMA |
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| 570. |
0^(@)C : Melting point of ice : :100^(@)C : ______ . |
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Answer» SOLUTION :BOILING POINT of water Ice MELTS at `0^(@)C`, similarly water boils at `100 ^(@)C`. |
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| 571. |
Alcohol consumption mainly affects _____________system. |
| Answer» Solution :ALCOHOL CONSUMPTION maily AFFECTS `ul ("NERVOUS" ) ` system. | |
| 572. |
………….,of birds is present in the form of feathers. |
| Answer» Solution :EXOSKELETON of birds is PRESENT in the FORM of feathers. | |
| 573. |
Concave lenses are used in camera lenses. |
| Answer» Solution :Correct statement- CONVEX LENSES are USED in camera lenses. | |
| 574. |
What are the characteristics required for the material chosen for making filament of incandescent lamp? |
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Answer» |
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| 575. |
Give an example of motion in which speed remains uniform, but the velocity changes. |
| Answer» SOLUTION :CIRCULAR MOTION | |
| 576. |
A student prepared a temporary mount of a leaf peel and observed some green dots. (i) Name these green dots and name the pigment present in them. (ii) State the function of this pigment. |
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Answer» SOLUTION :(i) Green DOTS are chloroplast. It contains green pigment called CHLOROPHYLL. (II) Chlorophyll traps solar energy. This solar energy is required by the plant to carry out the chemical REACTIONS involved in the preparation of food ( i.e., in photosynthesis ) . |
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| 577. |
Explain how the colour of the scattered light depends on the size of the colloidal particles. |
| Answer» Solution :The SIZE of the scattering particles decides the wavelength of the light which they scatter and hence, the colour of the scattered light. Smaller particles such as air MOLECULES in the atmosphere having sizes less than the wavelength of VISIBLE light mainly scatter blue light of shorter wavelengthin the visible spectrum. The particles of relatively larger size scatter light of longer wavelengths [near red end of the spectrum]. The large particles like raindrops, dust and ICE scatter white light. This makes the CLOUDS appear white. | |
| 578. |
Which of the follOwing materials has more number of free electrons in a given volume? |
| Answer» Solution :Copper | |
| 579. |
An electric iron of resistance 20Omega takes a current of 5A. Calculate the heat developed in 30s |
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Answer» Solution :I= 5A ,`H= 1.5xx10^(4)J ` t = 30 s, R =? `R= (H)/(I^(2)t) = (1.5xx10^(4))/(5xx5xx30)= (1.5xx10^(4))/(25xx30)` `= 20 OMEGA` |
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| 580. |
In a nuclear power plant, coolant is a substance : |
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Answer» which cools the HOT, spent steam to condense it back to water |
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| 581. |
(i) Calculate the mass of 6.023 xx 10^(20) molecules of H_2O. (ii) Calculate the moles of 12g of magnesium. (iii) Calculate the number of molecules present in 50 g of Fe. |
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Answer» Solution :Molecular mass of `H_2O = H XX 2 + O xx 1` `= 1 xx 2 + 16 xx 1` `= 2 + 16 = 18` Mass of an ATOM = `("Number of atoms")/("Avagardo.s number") xx "mass of" H_2O` `= (6.023 xx 10^(20))/(6.023 xx 10^(23)) xx 18` `10^(-3) xx 18` Mass of an atom = 0.018 g (II) Number of moles = `("Given mass")/("molecular mass")` `= 12/24 = 1/2 = 0.5` `:. 12 g` MAGNESIUM makes 0.5 moles. (iii) Number of atoms = `("Avagadro number" xx " Given mass)/("Gram atomic mass")` `=(6.023 xx 10^(23) xx 50)/(55.9)` `= 5.387 xx 10^(23)` `:. 50 g Fe` contain `5.387 xx 10^(23)` atoms/molecules. |
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| 582. |
Communicationg with friends, extreme competition in employment, developint hobbies, participating in laughter clubs. |
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Answer» Solution :EXTREME COMPETITION in emplyment All other are stress RELIEVING FACTORS, while extereme competition in cmployment is a stress causing FACTOR. |
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| 583. |
Calculate the pressure at a depthe 'h' in a liquid. |
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Answer» Solution :1. LET us consider a container which contains a liquid in it of density`'rho'` 2. Consider cylindrical column of height 'h' from the surface of the liquid of cross sectional area "A". 3. The volume of the liquid column V = Ah `"MASS"="Volume"xx"density"` `rArrm=Ahrho` `"Weight W"=mg=Ahrhog` From Newton's law the force on the liquid column is zero, because it is at REST. 4. The forces acting on the WATER column are a. Weight (W), vertically down b. Force on the surface due to atmospheric pressure `(P_(@)A)` acting vertically down. c. Froce on the botton surface of the column due to static pressure of liquid (PA), acting vertically up. 5. From Newton's law we get `PA=P_(@)A+WrArrPA=P_(@)A+hrhogArArrPA=A(P_(@)+hrhog)` `thereforeP=P_(@)+hrhog` P = Pressure at depth 'h' from the surface of the liquid `P_(@)`= Atmospheric pressure `therefore`The pressure inside the liquid at a constant depth is constant depth is constant. 
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| 584. |
A solutioninwhichnomoresolute can bedissolvedinadefiniteamoutof solvent at agiventermperatureis called______ |
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Answer» SATURATED SOLUTION |
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| 585. |
Calculate the work done in moving a charge of 2 coulombs across two points having a potential difference of 12 V. |
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Answer» Solution :Q=2C V=12 V W=V`XX`q `=12Vxx2C` =24 J. |
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| 586. |
Which of the following is NOT inclded under cyber crime ? |
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Answer» Hacking of confidential information of government from internet. |
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| 587. |
What is the major difference between astronomical and terrestrial telescope ? |
| Answer» SOLUTION :The major difference between astronomical and TERRESTRIAL telescope is ERECTING the FINAL image with respect to the object. | |
| 588. |
Three forces vecA =hati+hatj-hatk, vecB=2hati-hatj+3hatk and vecCare acting on a body to keep it in equilibrium. Then vecC is |
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Answer» `-(3hati+4hatk)` `vecA +vecB+VECC=vecO` `vecC=-(vecA+vecB)=-[hati+hatj+hatk+2hati-hatj+3hatk]` `=-[3hati+0hatj+4hatk)=-(3hati+4hatk)` |
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| 589. |
The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem ? |
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Answer» SOLUTION :The remedial lens should make the objects at INFINITY appear at the far point. For object at infinity, `u = - oo`. Far-point distance of the defected eye, `v = -80 CM`. By lens formula, `(1)/(f) = (1)/(v) - (1)/(u) = (1)/(-80) - (1)/(- oo) = -(1)/(80) + 0 = -(1)/(80)` ORF = - 80 cm. Power `P = (100)/(f("in cm")) = (100)/(-80) = -1.25 D`. Negative SIGN shows that the remedial lens is a concave lens. |
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| 590. |
State the relationship between 1 ampere and 1 coulomb. |
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Answer» Solution :The SI unit of charge, the coulomb, “is the quantity of ELECTRICITY carried in 1 SECOND by a current of 1 ampere". Conversely, a current of one ampere is one coulomb of charge going past a given point per second: In GENERAL, charge Q is DETERMINED by steady current I flowing for a time t as Q = lt. |
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| 591. |
List the uses of concave lens. |
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Answer» SOLUTION :(i) Concave lenses are used as EYE -LENS of 'Galilean Telescope'. (ii) In WIDE ANGLE spy hole in doors. (iii) To correct the defect of vision called 'myopia' |
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| 592. |
Three resistors of resistances 2 Omega, 3 Omega and 5 Omega are connected in series with 10 V battery. The voltage across 2Omega resistor will be ………………… . |
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Answer» `10 V` `R = 2 +3 +5 = 10 Omega` The current FLOWING through the circuit `I = V/R = 10 /10 = 1A` The VOLTAGE across `2 Omega` resistor `= 2 XX I = 2OMEGA xx 1A = 2V` |
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| 593. |
Ionization power maximum for ..... |
| Answer» Solution :`alpha` particles | |
| 594. |
What is spectrum? |
| Answer» Solution :When a WHITE light is passed through a TRANSPARENT MEDIUM, the white light splits in to seven colours which are made to FALL on a white screen. This coloured BAND is called spectrum. | |
| 596. |
A container whose capacity is 70 ml is filled with a liquid up to 50 ml. then the liquid in the container is heated. Initially, the level of the liquid falls from 50 ml to 48.5 ml. then we heat more, the level of the liquid rises to 51.2 ml. find the apparent and real expansion. |
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Answer» Solution :LEVEL of the liquid `L_(1)=50 ml` Level of the liquid `L_(2)-48.5 ml` Level of the liquid `L_(3)=51.2 ml` APPARENT expansion`L_(3)=L_(1)=51.2 ml-50 ml=1.2 ml` REAL expansion `=L_(3)-L_(1)=51.2 ml-48.5 ml=2.7 ml` So, Real expansion > apparent expansion |
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| 597. |
The centre of mass of an object having uniform density is at its____________. |
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Answer» CENTRE |
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| 599. |
Which colour has largest wavelength ? |
| Answer» SOLUTION :RED COLOUR has the LONGEST WAVELENGTH. | |
| 600. |
When a plastic bottle completelyfilled with water is kept in a freezer, it breaks. Why does this happen? |
| Answer» Solution :(1) The temperature of air in the FREEZER ( deep freeze) COMPARTMENT of a refrigerator is less thatn `0^(@)C `. ( 2) When a plastic bottle, completely filled with WATER, is KEPT in this compartment , the temperature of water fallsbelow `4^(@)C` and the water expands. Even when water freezesand ice is formed, there is an increases in the volume. It exerts a LARGE pressure on the sides of the bottle and hence the bottle is likely to break. | |