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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.
| 6901. |
A student used the set up given here to study the dependence of current (I) on the potential difference (V) across a resistor. He kept the contact C in four different positions marked as P,Q,R and S in the figure. On calculating the values of the ratio (V)/(I) for his four readings, he would find that the value of this ratio : |
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Answer» for contact at POINT P is `(1)/(4)TH` of that of contact at point S. |
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| 6902. |
Name the process in which momentum changes but KE does not. |
| Answer» SOLUTION :UNIFORM CIRCULAR MOTION. | |
| 6903. |
……………... is the work done in moving a unit positive charge from point A to B in an electric field. |
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Answer» Electric POTENTIAL at POINT A. |
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| 6904. |
Nuclear fission reactions are not a source of energy for one of the following. This is : |
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Answer» ATOM bomb |
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| 6905. |
The refractive index of water is 4/3'. Explain the meaning of this statement. |
| Answer» SOLUTION :It means that the speed of light in WATER is `3//4^(TH)` the speed of light in VACUUM (or air). OR the speed of light in air (or vacuum) is 4/3 times the speed of light in water. | |
| 6906. |
A boy of mass 40 kg climbs up a flight of 30 steps each 20 cm high in 2 min and a girl of mass 30 kg does the same in 1.5 min. Compare : (i) the work done, and (ii) the power developed by them (g = 10 m s^(-2)) |
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Answer» Solution : While climbing, both the boy and the girl have to do work against their force of gravity. Force of gravity of boy `F_(1)=m_(1)g=40xx10=400N` Force of gravity of girl `F_(2)=m_(2)g=30xx10=300N` Total HEIGHT climed up h=number of steps `xx` height of each step `W_(1)=F_(1)xxh=300xx6=1800J` Work done by the girl `W_(2)=F_(2)xxh=300xx6=1800J` `W_(1):W_(2)`=2400:1800 =4:3 (II)Power developed =`("Work done")/("TIME taken")` Here ,`t_(1)`=2min=120 s,`t_(2)`=1.5 min =90 s Power developed by boy `P_(1)=(W_(2))/(t_(2))=(1800J)/(90s)=20W` `P_(1):P_(2)=20:20=1:1` Alternative :(i)since height climbed is same `(W_(1))/(W_(2))=(m_(1)gh)/(m_(2)gj)=(m_(1))/(m_(2))=(40)/(30)=(4)/(3)` (ii) `(P_(1))/(P_(2))=(W_(1)//t_(1))/(W_(2)//t_(2))=(W_(1))/(W_(2))xx(t_(2))/(t_(1))=(4)/(3)xx(1.5)/(2)=(1)/(1)` |
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| 6907. |
(i) Explain the male reproductive systems of rabbit? (ii) What are vestigeal organs? |
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Answer» Solution :The MALE reproductive system of rabbit consists of a pair of testes which are ovoid in shape. Testes are enclosed by scrotal sacs in the abdominal cavity. Each testis consists of numerous fine tublues called seminiferous tubules. This networkof tubules lead into the sperm duct called vas deferens. The vas deferens join in the urethra just below the urinary bladder .The urethra runs backward and passes into the penis. There are three accessory glands namely prostate gland, cowper.s gland and perineal gland. Their SECRETIONS are INVOLVED in reproduction.  The degenrated and non functional organs of animals are called vestigeal organs. Eg. Vermiform APPENDIX, nictitating membrane, caudal vertebra, coccyx. |
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| 6908. |
Magnification of a convex lens is |
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Answer» POSITIVE |
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| 6909. |
One word is incorrect in the statement . Change it to make the statement correct : Aschelminthes have acoelomate and bilaterally symmetrical body. |
| Answer» SOLUTION :Platyhelminthes have ACOELOMATE and bilaterally symmetrical BODY. OR Aschelminthes have PSEUDOCOELOMATE and bilaterally symmetrical body. | |
| 6910. |
(i) Define distance of distinct vision. (ii) What is the role of iris in a human eye? |
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Answer» Solution :(i) The distance UPTO which normal EYE can see clearly without PUTTING any STRAIN on muscles of eye. (ii) Controls the size of the PUPIL. |
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| 6911. |
Explain what is meant by isothermal and adiabatic operations. |
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Answer» Solution :ADIABATIC a Process : Pressure, volume and temperature of the system changes but there is no EXCHANGE of HEAT. Isothermal Process : Pressure, volume changes temperature remain CONSTANT. |
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| 6912. |
If the radius of the Earth shrinks by 2%, mass remaing same, then how would the have of acceleration due to gravity change? |
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Answer» Solution :`g=(Gm^2)/(R^2)` TAKING logarithm `LOG g = log G+2log m-2log R` Differenntiating it `(dg)/(g)=0+0-2(dR)/(R )= -2[(-2)/(100)]` `(dg)/(g)xx100= -2[(-2)/(100)]xx100=4%`. |
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| 6913. |
Bipolar neurons are found in_____ |
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Answer» EARLY embryo |
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| 6914. |
The inability of a lens to bring all the rays coming from a point object to focus at one single point is called |
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Answer» SPHERICAL aberration |
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| 6915. |
Calculate the coefficient of cubical expansion of a zinc bar whose volue is increased 0.25 m^(3) from 0.3 m^(3) due to change in its temperature of 50K. |
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Answer» Solution :`alpha_(v)` of Zn BAR volume of ZINCE bar `V_(0)=V_(1)=0.3 m^(3)` Change in volume `DeltaV=V_(2)-V_(1)` `=0.25-0.30=0.05 m^(3)` Change in temperature `DeltaT=50 K` Coefficient of CUBICAL expansion `alpha_(v)=?` `alpha_(V)=(DeltaV)/(V_(0)DeltaT)=(0.05)/(0.3xx50)=(0.05)/(15)` `alpha_(v)=0.0033 K^(-1)` |
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| 6916. |
What is the importance of forest resources ? |
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Answer» Solution :A. Productive functions 1. Forests provide wood. Indian forests yield valuable timber wood like teak , sal , deodar , shisham etc. 2. Forests provide paper. The conifers and bamboos are used as raw material to prepare paper. 3. Medical plants of forests provide medicine of great importance. 4. Forests provide number of products like resins, gums, rubber, food and insecticides. 5. FOREST provide SHELTER to variety of animals. 6. Forests also provide the cork e.g. oak (Quercus). B. Protective functions. ROLE of forests in the protection of lands. Forests play a vital role in the life and economy of all tribes living in the forests. 1. Forest prevent erosion of soil by wind and water. 2. Large trees provide shade which prevents the soil from BECOMING dry and friable during the summer. 3. They cheak the velocity of rain drops or wind striking the ground and reduce dislodging of the soil particles. 4. The ROOTS system of plants firmly binds the soil. |
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| 6917. |
Read the statements given below. Identify and write the concept upon which the given statement is based. Identify and write the name of phenomenon that allows the image formed on retina to remain imprinted there for (1^(th))/(16) of a second after the object is removed from the front of the eyes. |
| Answer» SOLUTION :PERSISTENCE of VISION | |
| 6918. |
Read the statements given below. Identify and write the concept upon which the given statement is based. Doctor found that Radha's far point of eye had shifted closer to the eye. Which defect of vision is she suffering from? |
| Answer» SOLUTION :Nearsightedness/myopia | |
| 6919. |
Read the statements given below. Identify and write the concept upon which the given statement is based. Human eye lens has capacity to change its focal length. What is it called? |
| Answer» SOLUTION :POWER of ACCOMMODATION | |
| 6920. |
Read the statements given below. Identify and write the concept upon which the given statement is based. Tara used two convex lenses and found that capacity of two lenses to converge incident light was different. Write the name of quantity responsible for this difference. |
| Answer» SOLUTION :POWER of LENS | |
| 6921. |
Seema's father Mr. Soni runs a cosmetics and perfumes shop in a crowded market place. Mr. Soni usually complains at home that there is lot of 'shop-lifting' in his shop which was causing loss to him. Seema used to hear such complaints of her father. One day Seema went to the market and purchased two big mirrors of a special kind. She then went to her father's shop and fixed the two big mirrors at two strategic positions inside the shop. Mr. Soni found that after the installation of these mirrors, the shop-lifting almost stopped. He was very happy and thanked Seema for making this possible. (a) What type of mirrors were fixed by Seema in the shop ? (b) How did these mirrors help in preventing shop-lifting ? (c) Whatspecial name is given to such mirrors which help prevent shop-lifting? (d) Can you give one example of another use of such mirrors ? (e) What values are exhiibited by Seema in this episode ? |
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Answer» Solution :(a) Convex mirrors. (b) Mr. Soni could see the virtual, erect and diminished images of the customers by LOOKING at the TWO big convex mirrors. In this way, Mr. Soni was able to keep a watch on most of the customers PRESENT in the shop (with the help of these two big convex mirrors) and hence the shop-lifting almost stopped. (c) Shop SECURITY mirrors. (d) Convex mirrors are used as rear-view mirrors in vehicles such as cars, buses, trucks, motorcycles and scooters, etc. (e) The values exhibited by Seema are (i) Knowledge about various types of mirrors (II) Application of knowledge in everyday situations, and (iii) Desire to solve her father's problem. |
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| 6924. |
A lens doesn't prodoce any deiviation of ray of light passing through its ……… |
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Answer» CENTRE of curvature |
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| 6925. |
Explain Presbyopia using the following points- ( c) Correction. |
| Answer» SOLUTION :( c) SOMETIMES people also suffer from nearsightdness as WELL as farsghtedness. In such a case, bifocal LENSES are required to correct the defect. In such lenses, the upper part is CONCAVE lens which correct nearsightedness, while the lower part is a convec lens which correct the farsightedness. | |
| 6926. |
Why does a car parked in sunlight remain hot from inside even when there is no sunlight ? |
| Answer» Solution :The GASS windows have the peculiar property to pass through them only radiations which have wavelength near to the visible LIGHT or shorter wavelength. It does not allow infrared radiations of higher wavelength. SINCE the sun sends infrared radiations of LOWER wavelength, these pass through the GLASS windows and get inside the car as heat. Then, heat or infrared radiations of higher wavelength do not pass out of the car and thus heat gets trapped in the car for a longer time. | |
| 6927. |
A railway carriage moves over a straight track with acceleration a. Passenger in the carriage drops a stone. What is the acceleration of the stone w.r.t. the carriage and the earth? |
| Answer» SOLUTION :`sqrt(a^(2)+g^(2))` where g = acceleration DUE to GRAVITY. | |
| 6928. |
The part of the human brain which acts as relay centre is ………………. |
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Answer» THALAMUS |
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| 6929. |
The sun appears oval at sunrise and sunset, but appears circular at noon. Why ? |
| Answer» SOLUTION :This happens on ACCOUNT of ATMOSPHERIC REFRACTION. For DETAILS. | |
| 6930. |
What is the principle of eversibility of light ? Show that the incident ray of light is parallel to the emergent ray of light when light falls obliquely on a side of a rectangular glass slab. |
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Answer» Solution :According to the principal of reversibility of LIGHT, if path of a light ray is reversed at a point then the entire path of light ray is reversed. An important consequence of this property is `n_(12) = (1)/(n_(21))` where `n_(12)` = refractive index of medium 1 with respect to medium 2 and `n_(21)` = refrective index of medium 2 with respect to medium 1. Consider refraction through a glass slab as shown in Figure. At the first surface `n_(1) = 1`, hence from Snell.s LAW, we have `(sin i_(1))/(sin r_(1)) = (n_(2))/(1) or sin i_(1) = n_(2) sin r_(1)""...(i)` For refraction at the second surface `i_(2) = r_(1)` (being alternate angles) and `n_(3)` = 1 for air. Hence, `(sin i_(2))/(sin r_(2)) = (sin r_(1))/(sin r_(2)) = (n_(3))/(n_(2)) = (1)/(n_(2))` or `sin r_(2) = n_(2) sin r_(1)""...(ii)` A simple comparison of (i) and (ii) shows that `sin r_(2) = sin i_(1)`. It means that ANGLE of emergence `r_(2)` is equal to angle of INCIDENCE `i_(1)` at the glass slab. |
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| 6931. |
When a few drops of phenolphthalein are added to a dilute solution of sodium hydroxide, a pink colour is produced. What will be the colour of the final mixture when exces of HCI is added to it? |
| Answer» SOLUTION :When excess of HCI is ADDED, the colour of the FINAL mixture will be colourless because the pink colour of SODIUM HYDROXIDE is neutralized with the acid. | |
| 6932. |
Find the focal length of a convex mirror whose radius of curvature is 32 cm. |
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Answer» SOLUTION :R=32 CM `f=R/2=32/2=16cm` |
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| 6933. |
Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm. |
Answer» SOLUTION :The diagram is as shown below  `x=1m=100cm` `d=25cm` `f=(xd)/(x-d)=(100xx25)/(100-25)` `f=33.33cm` `P=(1)/(f(m))` `=(100)/(f(CM))=(100)/(33.33)=+3D` |
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| 6935. |
Surabhi from Std. X uses spectacles. The power of the lenses in her spectacles is 0.5 D . Identify the defect of vision Surabhi is suffering from. |
| Answer» SOLUTION :SURABHI is sufferingfrom HYPERMETROPIA (FARSIGHTEDNESS). | |
| 6936. |
What is heparin? What is its use? |
| Answer» SOLUTION :HEPARIN is an anticoagulating substance produced in LEECH by its salivary gland. | |
| 6937. |
Identify the animal given in the figures and label the figure : |
Answer» SOLUTION :
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| 6938. |
Brielf describe an activity to find approximate focal length of a convex lens |
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Answer» Solution :The lens is placed along the PATH of LIGHT EITHER sun rays of through electric lamp. The rays converge at a point. The DISTANCE between converging point and lens is meassured which gives the rough FOCAL length of the convex lens. |
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| 6939. |
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil, (ii) withdrawn from inside the coil, (ii) held stationary inside the coil? |
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Answer» Solution :(i) When a bar magnet is pushed into the coil of insulated COPPER wire connected to a galvanometer, an induced current is set up in the coil. As a result, galvanometer gives a deflection (say towards left). (ii) When the bar magnet is withdrawn from inside the coil, again an induced current is set up in the coil. HOWEVER, now DIRECTION of induced current is opposite to that in earlier case. Hence, deflection in galvanometer is in reverse direction (say towards right). (iii) If the bar magnet is held stationary inside the coil, then there is no induced current in the coil. As a result, galvanometer does not SHOW any deflection. |
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| 6940. |
The regularities in the motion of stars is called 'wobble'. |
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Answer» |
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| 6941. |
(marginal, array, cell, panel, string, current, power station, potential difference). Many solar panels are connected in series and in parallel to generate required …………………..and…………………….Solar……………………..is the basic unit in solar electric plant. Many solar cells come together to from a solar .......................... Many solar panels connected in series form a solar ........................, and, many solar strings connected in parallel form a solar ...................... . As we can obtain as much electrical power as needed, they are used in applications which need ....................... power (e.g. calculators that run on solar energy) to .......................... of MW capacity. |
| Answer» SOLUTION :Many SOLAR panels are connected in series and in parallel to generate required current and potential difference. Solar cell is the basic unit in solar electric plant. Manysolar cells come together to form a solar PANEL. Many solar STRINGS connected in series form a solar string, and, many solar strings connected in parallel form a solar array. As we can obtain as much electrical power as needed, they are used in applications which need marginal power to power STATION of MW capacity. | |
| 6942. |
Match III {:("1. Soddy fajan", "(a) Natural radiioactivity"), ("2. Irene curie", "(b) Displacement law"), (3. "Henry Bequerel", "(c) Mass energy equivalence"),(4. "Albert einstein" , "(d)artificial radioactivity"):} |
| Answer» Solution :1. (b) Displacement LAW 2.d) Artificial Radioactivity3. (a) Natural radioactivity4. (c) MASS ENERGY equivalence | |
| 6943. |
Discuss the motion of an object under free fall and draw (a) acceleration-time , (b) velocity-time and (c ) position-time graph for this motion . |
Answer» Solution :The object FALLS with UNIFORM acceleration EQUAL to ‘G’ 
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| 6944. |
What is molluscan shell made up of and which part of the body secretes it ? |
| Answer» Solution :The molluscan SHELL is MADE up of CALCIUM carbonate and it is secreted by the mantle that covers the visceral mass. | |
| 6945. |
Answer the following questions . (a) "Gender of child is determined by the male partner of couple . " Draw a diagram explaining the above statement . |
Answer» SOLUTION :
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| 6946. |
Explain the cause of resistance in a conductor and differentiate between conductors and insulators. |
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Answer» Solution :The electric CURRENT flowing in a conductor is due to the motion of the free electrons in a fixed DIRECTION. These electrons collide with the ions, atoms or molecules of the conductor. This retards their motion. Hence, there is opposition to electric current. This opposition is called the resistance of the conductor (R). Good CONDUCTORS like copper, aluminium, etc., offer low resistance to the flow of current. This is because they contain a large number of free electrons. In insulators, there are no free electrons. As a result, practically no electric current flows through them even on application of voltage ACROSS them. Thus, the resistance of the insulators is very HIGH. |
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| 6947. |
If two forces are acting at a point such that the magnitude of each force is 2N and the magnitude of their resultant is also 2N, then the angle between the two forces is |
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Answer» <P>`120^(@)` `R^(2)=P^(2)+Q^(2)=2PQ Cos THETA` `4=4+4+2(4)+Cos theta` `cos theta=(-4)/(8)=(-1)/(2), theta=120^@` |
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| 6948. |
How is the fuse connected in an electric circuit? |
| Answer» SOLUTION :FUSE is CONNECTED in SERIES in the CIRCUIT. | |
| 6949. |
Antibiotics are |
| Answer» SOLUTION :An ANTIBIOTIC is an ANTIBACTERIAL or antimicrobial drug used in the treatment and prevention of bacterial infections by EITHER killing or inhibiting the GROWTH of the bacteria. | |
| 6950. |
Fuse wire is a ............ |
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Answer» tin-lead ALLOY |
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