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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.
| 3451. |
The diagram in Fig.1.29 shows two forces F_1=5N and F_2=3N acting at points A and B of a rod pivoted at a point O,such that OA=2m and OB=4m Calculate: (i) the moment of force F_1 about O. (ii) the moment of force F_2 about O. (iii) total moment of the two forces about O. |
| Answer» SOLUTION :(i) 10NM (anticlockwise) (ii) 12 Nm (CLOCKWISE) (III) 2Nm (clockwise) | |
| 3452. |
Magnification of a lens m = (h')/(h) ________________. |
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| 3454. |
Enlist the uses of stem cells. |
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Answer» Solution :Stem cells are used for following PURPOSES : (1) In regenerative therapy stem cells are used. (2) In case of diseased conditions like DIABETES, myocardial infarction, Alzheimer's disease, Parkinson's disease, etc., stem cells can be used to replace the damaged or functionless cells. (3) In conditions such as anaemia, THALASSAEMIA, leukaemia, etc. there is ALWAYS the need of newer blood cells. Here, stem cells can be used to restore the number of blood cells. (4) In techniques of organ transplantation, stem cells can be used and they can help in the transplantation of new organs such as kidney and liver. The defective organs can be replaced by those that are PRODUCED with the help of stem cells and transplanted. |
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| 3455. |
Bird from very cold regions : Penguin : : Aquatic Mammal from very cold regions : : ……….. |
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| 3456. |
Different coloured light has same wavelength and frequency. |
| Answer» Solution :correct statement-DIFFERENT COLOURED LIGHT has different wavelength and FREQUENCY. | |
| 3457. |
Deliquescenceis dueto ________ |
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Answer» STRONG AFFINITY to water |
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| 3458. |
Why are we looking at alternate source of energy? |
| Answer» SOLUTION :Fossil fuels, traditionally used by human beings as enery sources, are non-renewable. They are limited and cannot eplenish on their own. They are being CONSUMED at a large rate. f this rate of consumption CONTINUES, the fossil fuels would be exhausted from the earth. So, we have to conserve hem. HENCE, we should look for alternative energy sources. | |
| 3459. |
Explain the process in short . |
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Answer» Solution :(1) The PITS are dug in open spaces . (2) These pits are lined with plastic sheets . Therefore , the leaching of toxic and harmful materials is AVOIDED to reduce the chance of soil POLLUTION due to leachates . (3) Compressed waste is put in the pit and is covered with layers of soil , saw dust , LEAFY waste . (4) Specific biochemical substances are added for speedy decomposition . Bioreactors which are mixtures of bacteria are mixed at some places . (5) Soil microbes and other top layers decompose the waste . Soil slurry is used to seal the pits completely . (6) After a certain period , best quality compost is formed . such land filling sites can be reused after REMOVAL of compost . |
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| 3460. |
White light is a combination of light of seven colours and these colours are separated from one another when white light is passed through a prism. |
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| 3461. |
A body is moved in a direction opposite to the direction of force acting on it.State whether the work is done by the work in done against the force. |
| Answer» SOLUTION :WORK is DONE against the FORCE. | |
| 3462. |
Vikalp's father had constructed a new room in their house. An electrician was called in to do the electric wiring. The electrician was asked to do wiring for two fans, two bulbs, a light socket and a power socket. Vikalp studies in tenth standard. Just when the electrician had completed the wiring, Vikalp returned home from school. Vikalp wanted to check the wiring to by using all the switches and sockets. Vikalp found that the two fans and two sockets worked properly, each having a separate switch but there was a problem in the working of bulbs. Both the bulbs could be switched on and switched on and switched off with the same switch. Vikalp explained the mistake in wiring to electrician and then two separate switches were provided for the two bulbs. (a) In what way were the two fans and two sockets connected in the household circuit by the electrician ? (b) What mistake was made by electrician in connecting the two bulbs in the circuit ? (c) In addition to the problem of not being able to be switched on and switched on and switched off independently, What other problem could be observed easily in the working of two electric bulbs, if the mistake had not been corrected ? (d) What values were displayed by Vikalp during this incident ? |
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Answer» Solution :(a) The two fans and two sockets were connected correctly in parallel circuits. (B) The two electric bulbs were connected wrongly in series in the circuit. (c) The two electric bulbs would glow less brightly when connected in series because they would not get the same VOLTAGE of 220 volts of the mains supply line. (d) Vikalp showed the VALUES of (i) Curiosity ot check whether things worked properly or not (ii) Knowledge of household wiring, and (iii) Application of knowledge. |
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| 3463. |
How do we see colours ? |
| Answer» Solution :The retina of our eye contains NUMEROUS cells, which are light sensitive. These cells are of TWO types : rod shaped cells respond to brightness//intensity of light and cone shaped cells respond to colour of light. When light falls on the retina, these cells get activated. They send electrical SIGNALS to the brain through the OPTIC nerve. The brain processes this information and we see OBJECTS as they are. Thus colours are seen due to activation of cone shaped cells. | |
| 3464. |
The SI unit for angular velocity is |
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Answer» m/s |
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| 3465. |
Differentiate the following (a) Monocot root and Dicot root (b) Aerobic and Anaerobic respiration |
Answer» SOLUTION : (B) AEROBIC and ANAEROBIC RESPIRATION 
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| 3466. |
Give two differences between food chain food web. |
| Answer» Solution :Food CHAIN is a definite sequence of interaction between producers, consumers and DECOMPOSERS ( saprophytes), whereas food web is an NETWORK of food chains which are interconnected at various LEVELS FORMING an intricate web instead of a linear chain. | |
| 3467. |
Valencyof elements ________ in a periodfromleftto right |
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Answer» INCREASES |
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| 3468. |
The natural uranium ore is processed and en riched at the Nuclear Fuel complex at |
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Answer» Kolkata |
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| 3469. |
Define spring constant of spring. |
| Answer» Solution :It is the RESTORING force SET up in a string PER UNIT extension. | |
| 3470. |
Assertion :The cloud in sky generally appears white. Reason : Due to diffraction of clouds [The light is scattered by the droplets inside the cloud ]. |
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Answer» Both ASSERTION and REASON are true and reason is CORRECT explanation of assertion. |
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| 3471. |
A student performs the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He measures the angle of incidence anglei, angle of refraction angler and angle of emergence angle e for all his observations. He would find that in all cases : |
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Answer» `angle i` is more than `angle r` but (nearly) equal to `angle e` |
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| 3472. |
What is a chain reaction ? |
| Answer» SOLUTION :A reaction in which the particle which initiates (starts) the reaction is also PRODUCED during the reaction to carry on the reaction further and further is CALLED a CHAIN reaction. | |
| 3473. |
How does the resistance of an ohmicconductor depend on the applied voltage? |
| Answer» SOLUTION :RESISTANCE R is a constant. so it does not DEPEND UPON the applied VOLTAGE. | |
| 3474. |
In 1 s, a particle goes from point A to point B moving in a semicircle as shown in figure. The magnitude of the average velocity is |
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Answer» Zero velocity `=("Magnitude of displacement")/("TIME taken")` `=(2m)/(1S)=2MS^(-1)` |
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| 3475. |
Name one technique which can detect cancerous tissue inside the body of a person. |
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| 3476. |
Explain in brief the reason for each of the following: (i) The sun appears reddish during sun-rise. (ii) At noon the sun appears white. (iii) To an astronaut the sky appears dark instead of blue. |
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Answer» SOLUTION :(i) During morning sun rays travel large distances in the earth.s atmosphere, and in this process the shorter wavelengths SCATTER away and only large wave length (red light) REACH us. (ii) At noon sun is OVERHEAD and light rays travel comparatively smaller distance and only little of blue / violet light scatter, so sun appears white. (iii) No atmosphere in outer space for scattering, so sky appears DARK. |
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| 3477. |
Give the benefits of microbial inoculants : |
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Answer» Solution :(1) The NUTRIENTS are supplied through the microbial inoculants which help in growth of plants. (2) The nutritional QUALITY of crops is increased. (3) SOIL pollution c.aused by chemical fertilizers is prevented by injecting solution contai!}ing Azotobacter and artificial nitrogenase. Such methods are adopted in organic farming. (4) Chemicals like fluoroacetamide are mixed with soil as chemical pesticides in agriculture. Such harmful SUBSTANCES can be eradicated by USING microbes. |
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| 3478. |
A ray of light bends while passing from one transparent medium to another medium having a different refractive index. (a) Name the phenomenon. Give reason for it. (b) How do the following quantities change: speed. Wavelength, frequency and amplitude is second medium is denser than the first medium. (c) State whether the ray of light will bend or not, if both media have the same refractive index. |
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Answer» Solution :Refraction. The reason of BENDING (or refraction) is the change in speed of light in passing from ONE MEDIUM to another of different refractive index. (b) Speed will decrease. (b) speed will decrease. Wavelength will decrease. Frequency will REMAIN unchanged. Amplitude will decrease (due to partial reflection at the boundary of TWO media). |
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| 3479. |
Image of a real object placed in front of a lens is always virtual, erect and diminished one. The lens is a ______________ lens. |
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| 3480. |
_________ are used to convert non-fissionable materials into fissionable materials. |
| Answer» SOLUTION :BREEDER REACTORS | |
| 3481. |
Resistance of a metal wire of length 1m is 26 Omega" at " 20^@C.If the diameter of the wire is 0.3mm, what will be the resistively fo the metal at that temperature ? Using Table 2 (on page 116), predict the material of the wire. |
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Answer» Solution :We are given the resistance R of the wire = 26`Omega`, the diameter d = 0.3 mm `= 3 xx 10^(-4) m, ` and the length l of the wire = 1 m. Therefore, from equation `R =rho =l/A` the resistively of the given METALLIC wire is `rho = (RA)/l` `=(R pi d^2//4l) ( :. A = pi r^2 = pi(d/2)^2 =(pid^2)/4)` `:. rho =(26xx 3.14 xx (3 xx 10^(-4))^2)/(4 xx 1)` `rho = 1.84 xx 10^(-6) Omega m` The resistivity of the METAL at `20^@C` is `1.84 xx 10^(-6) Omega m`. From Table 2 (on page 116), we see that this is the resistivity of manganese. |
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| 3482. |
Difference between mass and weight. (any five) |
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Answer» SOLUTION :CHARGE `Q=20C` TIME `t=5`s THEREFORE, CURRENT `I=Q//t=20//5=4A`. |
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| 3483. |
Iodinedecolorizes in stearicacid, because _____. |
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Answer» ITIS SATURATED |
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| 3484. |
Distinguish betweeb terms overloading and short circuiting as used in domestic circuits. |
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Answer» Solution :SHORT Circuitng. If sometimes a live wire TOUCHES neutral wire or earth wire, a large current flows through the circuit due to almost zero resistance of the circuit. This is called short-circuiting. To save the circuit from damage FEARED due to over-loading or short-circuiting, a fuse of proper rating is put in each circuit. Over-Loading. The supply wires as well as wires used in household wiring has a SPECIFIC rating. The rating of 15 A means that if a current upto 15 A is passed through circuit, there is no likely damaged feared to the circuit. But if a current more than maximum ALLOWED limit is passed, there may be excessive heating of the wires and it may damage the wiring due to excessive heating. |
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| 3485. |
An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm. (i) Use lens formula to find the distance of the image from the lens. (ii) List four characteristics of the image (nature, position, size, erect/inverted) formed by the lens in this case. (iii) Draw a ray diagram to justify your answer of part (ii). |
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Answer» Solution :(i) Here u = - 60 cm and f = - 30 cm (Because the lens is a concave lens). Using lens FORMULA `(1)/(V) - (1)/(u) = (1)/(f)`, we have `(1)/(v) = (1)/(f) + (1)/(u) = (1)/((-30)) + (1)/((-60)) = - (1)/(20)` `rArr""v = - 20` cm Thus, distance of image from the lens is 20 cm. (ii) The image is virtual, formed on same side of lens at 20 cm from the lens, diminished in size and erect one. (iii) RAY diagram is drawn in Figure. The ray diagram verifies the answer obtained in part (ii). 
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| 3486. |
The potential difference available from a solar cell is dependent on its area. State true/false. |
| Answer» SOLUTION :TRUE.(The POTENTIAL difference available from a solar cell is independent of its area. HOWEVER, it is dependent on the way in wich solar cells are CONNECTED.) | |
| 3487. |
What are the necessary materials that should be included in a first aid kit? |
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Answer» SOLUTION :i. First aid kit is a small box which contains items required for administering first aid to a victim of an accident ordisaster. ii. Some of the IMPORTANT materials which should be INCLUDED in a first aid kit are: Bandage strips of different sizes, wound GAUZE, triangular and circular bandage, mediucated cotton, hand gloves, clean and dry cloth pieces, soap, antiseptic (Dettolo/Savlon), safety pins, blade, small pins, needle, band-aid, torch, scissor, themometer, petroleum jelly, etc. |
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| 3488. |
Draw a displacement vector from Visakhapatnam to Hyderabad to the following diagram. |
Answer» SOLUTION :
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| 3489. |
When an electric current is passing through a conductor, there is no electric field produced because the conductor is |
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Answer» POSITIVELY charged |
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| 3490. |
How can a sloenoid be used to magnetise a steel bar ? |
| Answer» SOLUTION :A STEEL bar can be MAGNETIZED by inserting it INSIDE a solenoid CARRYING an electric current. | |
| 3491. |
When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates immediately with a brisk effervescence. Name this gas. Describe the method of testing this gas. |
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Answer» SOLUTION :The gas LIBERATED is CARBON dioxide. `CH_(3)COOH(AQ)+NaHCO_(3)(s) to CH_(3)COONa(aq)+H_(2)O(l)+CO_(2)(g)uarr` The gas is tested using LIME water. When this gas is passed through lime water, it turns milky. |
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| 3492. |
Tripling the speed of a motor car multiplies the distance required for stopping it by |
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Answer» Solution :We have, `FxxS = (1)/(2)MV^(2)` `Spropv^(2)` When V is trippled, S becomes 9 times. |
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| 3493. |
(a) If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why? (b) Define the radius of curvature of spherical mirrors. Find the nature and focal length of a spherical mirror whose radius of curvature is +24 cm. |
Answer» Solution :(a) This mirror is Convex mirror. Such mirrors are USED as rear VIEW mirror in automobiles, as convex mirror gives erect, and wider range of view of objects coming behind the AUTOMOBILE. (b) Radius of curvature of a mirror is the DISTANCE between 'P' point (POLE) and 'C' point (centre of curvature) of a sphericalmirror. `f=(r)/(2) "So," f=(24)/(2)` `therefore f= +12` cm and this mirror is a convex mirror. |
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| 3494. |
Radiations from cell phones : Headache :: ____________:Hindrance to the brain development. |
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| 3495. |
Consider a region inside which there are various types of charges but the total charge is zero. At points outside the region, |
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Answer» the electric field is NECESSARILY zero. |
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| 3496. |
A compound 'A' is used in the manufacture of cement. When dissolved in water, it evolves a large amount of heat and forms compound 'B'.(i) Identify A and B.(ii) Write chemical equation for the reaction of A with water.(iii) List two types of reaction in which this reaction may be classified. |
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Answer» SOLUTION :(i) A is CAO (Quick lime) B is `Ca(OH)_2` (Slaked lime or lime water). (ii) `UNDERSET("Quick lime")(CaO)+2H_2Orarrunderset("Slaked lime or lime water")(Ca(OH)_2)` (III) COMBINATION reaction, Exothermic reaction |
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| 3497. |
A ray of light is incident on a parallel-sided glass slab as shown in the figure. The angle of refraction for this ray of light is likely to be : |
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Answer» `60^(@)` |
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| 3499. |
Assertion: The apparent weight of the person is zero, in which condition or state is known as weightless. Reason : When the person in a lift moves down with an acceleration (a) is equal to the acceleration due to gravity (g) |
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| 3500. |
How do we perceive different colours ? |
| Answer» Solution :The retina is lined with a variety of light SENSING cells which are rod shaped and cone shaped. While the rods on the retina are sensitive to the intensity of light, they cannot distinguish between lights of different colours. On the other hand, the CONES are the COLOUR-sensing cells of the retina. When light of a certain colour enters the eye and STRIKES the cones of the retina, an electrical impulse is sent along nerves to the brain which enables us to identify the colour. | |