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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.
| 5601. |
Name the alloy which is mainly used for making permanent magnets. |
| Answer» Solution :The alloy .Alnico. is used for MAKING permanent magnets. It is an alloy of ALUMINIMUM, NICKEL, COBALT and iron. | |
| 5602. |
Deepak's mom was finding difficult to cook in the kitchen as there was power cut, and she was calied Deepak for help. He immediately took a plane mirror from his shelf made it stand against a wall suchthat sun's rays were focussed into the kitchen due to the reflection of the mirror. There was some lighting and his mother was able to finish her work. What are the characteristic of the image formed by a plane mirror ? |
| Answer» Solution :The IMAGE formed is VIRTUAL. It is ERECT and of same size as the OBJECT. | |
| 5603. |
Whatis aqueousand non -aqueoussolution ? |
| Answer» Solution :`{:(,"AQUEOUS solution","Non-Aqueous solution"),(1, "Water ACTS as a solvent","Any LIQUID, other than water, acts as a solvent"),(,"E.g. Common salt in water","E.g. SULPHUR dissolved in carbon disulphide"):}` | |
| 5604. |
Deepak's mom was finding difficult to cook in the kitchen as there was power cut, and she was calied Deepak for help. He immediately took a plane mirror from his shelf made it stand against a wall suchthat sun's rays were focussed into the kitchen due to the reflection of the mirror. There was some lighting and his mother was able to finish her work. What values did Deepak display? |
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Answer» Solution :The VALUES Deepak DISPLAYED were (1) Helping his mother (2) Is ABLE to apply his mind at required times |
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| 5605. |
Give one example each of unisexual and bisexual flowers. |
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Answer» SOLUTION :UNISEXUAL: PAPAYA and Watermelon Bisexual: HIBISCUS and Mustard |
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| 5606. |
Why are the conductors of electric heating devices, such as bread-toaster and elecbic irons, made of an alloy rather than a pure metal ? |
| Answer» SOLUTION :As alloy has high MELTING point so it can be heated to a large AMOUNT till getting RED hot without melting. | |
| 5607. |
Radiations of cell phones penetrate the bonees of adults more effectively than the bones of children. |
| Answer» Solution :FALSE : RADIATIONS of cell phones PENETRATE the bonesof children more effectively than the BONES of ADULTS. | |
| 5608. |
Pusa komal is a disease resistant variety of____ |
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Answer» COW pea |
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| 5609. |
Observe and fill the information: |
Answer» SOLUTION :
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| 5610. |
In an electric cell while in use, the change in energy is from: (a) electrical to mechanical (b) electrical to chemical (c) chemical to mechanical (d) chemical to electrical |
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Answer» ELECTRICAL to mechanical |
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| 5611. |
USA has developed ……. As an alternativeto space launch vehicles. |
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Answer» |
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| 5612. |
The act by a person of indulging in clicking selfies without being aware of the world around and the risks involved. |
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Answer» |
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| 5613. |
A mirror having a very wide field of view must be |
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Answer» concave |
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| 5614. |
State one main function each of iris, pupil and cornea. |
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Answer» Solution :(i) IRIS : Gives colour to eyes, CONTROLS size of pupil. (ii) Pupil : Regulates amount of LIGHT. (iii) CORNEA : REFRACTS most of the light into eyes. |
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| 5615. |
Distinguish between real and virtual image with an example. |
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Answer» Solution :Real image. When a number of rays STARTING from a point after reflection or refraction actually MEET at ANOTHER point, that point is called real image of the FIRST point. A real image can be obtained on the screen. VIRTUAL image. When a number of rays starting from a point after reflection or refraction do not actually meet but appear to do so when produced backwards, the image is said to be virtual. Virtual image cannot be obtained on the screen. |
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| 5616. |
The energy produced by converting 1 gram mass of a nuclear fuel into energy completely is : |
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Answer» `9 xx 10^(16) J` |
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| 5617. |
What is the colour of scattered sunlight when the size of the scattering particle is relatively large ? |
| Answer» SOLUTION :SCATTERED SUNLIGHT APPEARS WHITE. | |
| 5618. |
What is meant by overloading and short circuit ? |
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Answer» Solution :(i) Over loading happens when a large number of appliances are connected in series to the same source of electric power. This LEADS to a flow of excess current in the electric circuit. (ii) When the amount of current passing through a WIRE exceeds the maximum permissible limit, the wires get heated to such an extent that a fire MAY be CAUSED. This is KNOWN as overloading. |
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| 5619. |
What type of reactions occur inside the Sun which produces solar energy ? |
| Answer» Solution :The nuclear FUSION reactions TAKING place INSIDE the Sun PRODUCE solar energy ? | |
| 5620. |
Two resistances wires, when joined in parallel, give an affective resistances of 6/5 Omega When one of the resistances wire is disconnected the effective resistances charges to 2 Omega. The resistance of the disconnected resistance wire is |
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Answer» `4/5 OMEGA` As per parallel arrangement `1/R_p=1/R_1+1/R_2` `implies 1/R_2=1/R_p-1/R_1=5/6-1/2=(5-3)/6=2/6=1/3 implies R_2=3 Omega` |
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| 5621. |
At what temperature, the speed of sound in the air will become double of its value at 27^(@)C? |
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Answer» `54^(@)C` `(1)/(4)=(27+273)/(T_(2))` `T_(2)=300xx4=1200K` `T_(2)=1200-273` `T_(2)=927^(@)C` |
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| 5622. |
Which spring has greater value of spring constant a hard spring or a delicate spring? |
| Answer» SOLUTION :HARD SPRING. | |
| 5623. |
If in a central heating system, steam enters a radiation pipe at 100^@C and water leaves the radiation pipe at 100^@C, can this radiation pipe heat a room? Give an explanation for your answer. |
| Answer» Solution :Yes, because STEAM at `100^@C` gives out its latent HEAT of VAPOURIZATION to condense the water at the same TEMPERATURE of `100^@C`. | |
| 5624. |
Definemoment of a couple. |
| Answer» Solution :Two equal and UNLIKE parallel forces APPLIED simultaneously at two distinct points constitutes a couple. A couple results in CAUSES the rotating of the body. This rotating effect of a couple is KNOWN as moment of a couple. | |
| 5625. |
Define vestigial organs. Write names of some vestigial organs in human body and write the names of those animals in whom same organs are functional. |
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Answer» Solution :(1) Vestigial organs are DEGENERATED or UNDERDEVELOPED organs of organisms which do not perform any function. (2) ACCORDING to the principle of natural selection, such organs are on the verge of disappearance. But it takes many millions of years for its COMPLETE vanishing. (3) The vestigial organs in one animal may be of use but to other kind of the animal as they still perform regular functions. (4) Appendix is vestigial for humans, it does not perform any function but in ruminant animals it is concerned with digestion. (5) Ear muscles are vestigial for us but in monkeys and cattle they are functional. |
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| 5626. |
1 Moleof anysubstancecontains______ molecules . |
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Answer» `6.023xx10^(23)` |
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| 5627. |
The near point of eye suffering fromhypermetropia is 1 m. Calculate the Power that is needed to correct this eye defect. In this case we are assuming the near point as 25 cm. |
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Answer» Solution :Here we KNOW the VALUES of u and v .PUT these values in the fonnula given above and final f i.e FOCAL length Value of u=-1m =-100cm Value of u=-1m=-100cm Value of -25cm USE the lens formula (1/v)-(1/u)=1/f `1/-25-1/-100=1/f 4-1/100=3/100 f=100/3=33cm =1/.33=3D Power of lens=1/f=3D |
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| 5628. |
A man is standing between two vertical walls 680m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 second respectively. What is the speed of sound in the air? |
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Answer» Solution :VELOCITY =`("DISTANCE TRAVELLED by sound")/("Time taken")` `d_(1)=(vt_(1))/(2)&d_(2)=(vt_(2))/(2)` `d=(V)/(2)(t_(1)+t_(2))` `v=(2d)/((t_(1)+t_(2)))` `=(2xx680)/((0.9+1.1))` `=(2xx680)/(2)` `v=680ms^(-2)` Given data.s d=680m `t_(1)=0.9s` `t_(2)=1.1s` v=? |
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| 5629. |
Explain the appplications of convex lenses used in the following instruments. Spectacles. |
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Answer» Solution :Conves LENSES are used in the FOLLOWING instruments. Spectacles : Convex lens is used in SPECTACLE to correct defect LIKE HYPERMETROPIA. |
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| 5631. |
Is radius of gyration of a body constant quantity ? |
| Answer» SOLUTION :No, it CHANGES with the POSITION of AXES of ROTATION. | |
| 5632. |
The refractive index of diamond is 2.42. What is the meaning of this statement? |
| Answer» SOLUTION :The refractive INDEX of diamond 2.42 SUGGESTS that the SPEED of light in diamond will reduce by a factor 2.42 as COMPARED to its speed in air. | |
| 5634. |
Roothairsare |
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Answer» cortical CELL |
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| 5635. |
At 27^@Ctwo moles of an ideal mono-atomic gas occupy a volume V. The gas expands adiabatically to a volume 2V. The final temperature of the gas is[ Take Y = 5/3] |
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Answer» 179 K or `T_2=T_1(V_1/V_2)^(gamma-1)` `T_2=300(V/(2V))^(5/3-1)=300(0.5)^(3//2)` `T_2=189.03K.` |
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| 5636. |
When solar panels are connected in parallel they form a solar string. |
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Answer» |
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| 5637. |
Where should be an object be placed in front of a convex lens to get a real image of the size of the object? |
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Answer» At the PRINCIPAL FOCUS of the lens |
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| 5638. |
State whether the following statements are true or false by writing T or F. (a) The velocity ratio of a single fixed pulley is always more than 1. (b) The velocity ratio of a single movable pulley is always 2. (c) The velocity ratio of a combination of n movable pulleys with a fixed pulley is always 2^(n). (d) The velocity ratio of a block and tackle system is always equal to the number of strands of the tackle supporting the load. |
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Answer» (B) T (C) T (d) T. |
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| 5639. |
A 6 Omega resistance wire is doubled on itself. Calculate the new resistance of the wire.(b) Three 2 Omega resistors A, B and C are connected in such a way that the total resistance of the combination is 3 Omega Show the arrangement of the three resistors and justify your answer. |
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Answer» Solution : LET LENGTH and cross-section area of given will be L and A respectively and`rho` be its resistivity. Then Resistance of WIRE R = (`rho`L)/(A)=6`OMEGA`…(i) When the wire is doubled on itself, its new length L. =`L/2`= and new cross-section area A. = 2A. So its new resistance will be `R.=(rhoL.)/(A.)=(rho(L/2))/((2A))=1/4(rhoL)/(A)=R/4=6/4=1.5 Omega` (b) The arrangement of 3 resistors of 2 `Omega` each, so as to have a net resistance of 3 `Omega`, is SHOWN here. Here `R_1` is in series of the parallel combination of `R_2` and `R_3`. If combined resistance of `R_2` and `R_3` be R.,then `(1)/(R.)=(1)/(R_2)+(1)/(R_3)=1/2+1/2=1/1` `implies R.=1 Omega` `Omega` Net resistance of ciricuit `R=R_1+R.=2+1=3 Omega` 
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| 5641. |
What are Spicules of poriferan animals made up of ? |
| Answer» SOLUTION :Spicules in poriferan animals are MADE up of CALCIUM carbonate or SILICA. | |
| 5642. |
Why are coils of electric toasters and electric irons are made of an alloy rather than a pure metal? |
| Answer» SOLUTION :RESISTIVITY of an alloy is generally higher and it does not OXIDIZE EASILY. | |
| 5643. |
Rewrite the food chain given below in the correct sequence. i. Insect rarrHawk rarr SnakerarrFrograrrGrass ii. Birds rarrZooplanktons rarr Phytoplanktonsrarr Small FishesrarrBigFishes |
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Answer» Solution :i. GRASS`rarr` Insect `rarr`Frog `rarr`SNAKE`rarr`Hawk II. Phytoplanktons `rarr`Zooplanktons `rarr ` Small FISHES `rarr` BIG Fishes `rarr `Birds |
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| 5644. |
Calculate the curren and the resistance ofa 100W, 200V electric bulb in an electric circuit. |
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Answer» SOLUTION :POWER `P=100W` and Voltage `V=200V` Power `P=VI` So, Current, `I=(P)/(V)` `=(100)/(20)=0.5A` Resistance, `R=(V)/(I)` `=(200)/(0.5)=400Omega` |
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| 5645. |
How much heat energy will be given off in cooling water of 2.5 kg from85^(@)C"to "35^(@)C? |
| Answer» SOLUTION :125 KCAL | |
| 5647. |
Wheels are made circular. Why ? |
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Answer» |
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| 5648. |
List the characteristics of image formed in a plane mirror. |
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Answer» Solution :(i) Image is the same as that of the object SIZE. (ii) The distance of the image from the PLANE MIRROR (object distance) is equal to the distance of the mirror from the image (image distance). (iii) The image formed is laterally inverted. (iv) The image formed is ERECT and upright. (V) The image formed is virtual. |
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| 5649. |
At noon, the Sun appears as white but in morning or evening appears as reddish. Why ? |
Answer» Solution :Asshown in Fig. 11.15, atnoon the SUNLIGHT would TRAVEL RELATIVELY shorter distance before reaching us. As a result, scattering of blue and violet light is very less and the Sun appears white. In early morning or evening, Sun is near the horizon and surnlight passes a LONGER distance in earth.s atmosphere before reaching us. So most of the blue-violet light is scattered away. It GIVES reddish appearance to the Sun. 
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| 5650. |
A gas filled in a closed vessel is heated through 1K and its pressure increases by 0.4%. What was the initial temperature of the gas ? |
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Answer» `250K` `(P_(1))/(T_(1))=(P_(2))/(T_(2))IMPLIES(P)/(T)=(P+0.4%"of" P)/(T+1)impliesT=250K` |
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