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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.
| 7651. |
Name the phenomena involved |
| Answer» SOLUTION :ELECTROMAGNETIC INDUCTION. | |
| 7652. |
Statein whichof the followigcases, the induced currentin the loop will not be obtained . |
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Answer» The loop is movedtowardsthe magnet . |
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| 7653. |
What is meant by real expansion ? |
| Answer» Solution :If a liquid is heated DIRECTLY WITHOUT using any CONTAINER, then the expansion that we observe is TERMED as "real expansion" of the liquid. | |
| 7654. |
A cell is connected to a 9 ohm resistance, because of which heat of 400 J is produced per second due to current flowing through it. Obtain the potential difference applied across the resistance. |
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Answer» TIME `(t)=1s` `"To find:POTENTIAL difference (V)"` `"Formula:H"=(V^(2)t)/(R)` `"Calculation:From formula,"` `V=sqrt((HxxR)/(t))` `=sqrt((400xx9)/(1))` `=sqrt(400)xxsqrt(9)` `=20xx3` `=60V` |
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| 7655. |
Three nonmetallic elements in the period 2. |
| Answer» Solution :(i) NITROGEN (ii) OXYGEN(III) FLUORINE | |
| 7656. |
By convention , the power of a convex lens is taken as ………… whereas the power of a concave lens is taken as …………… . |
| Answer» SOLUTION :POSITIVE NEGATIVE | |
| 7658. |
Transformation of solid into liquid : ______ : : Transformation of liquid to gas : Latent heat of vapourization. |
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Answer» |
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| 7659. |
Two Iron blocks of equal masses but with double surface area slide down an Inclined plane with coefficient of friction mu. If the first block with surface area A experience a friction force f, then the second block with surface area 2A will experiences a frictional force. |
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Answer» f/2 |
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| 7660. |
Which vision defect arises when the eyeball (i) shrinks and (ii) elongates in size ? |
| Answer» SOLUTION :(i) HYPERMETROPIA. (II) MYOPIA. | |
| 7661. |
LED stands for………. |
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Answer» a)Light Enter DIODE |
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| 7662. |
Equal heat is given to two objects A and B of mass 1g. Temperature of A increases by 3^@C and B by 5^@C. Which object has more specific heat? And by what factor? |
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Answer» Solution :Given : Heat given to A = Heat given to B Change in Temperature of A =`DeltaT_A=3^@C` Change in Temperature of B =`DeltaT_B=5^@C` To Find: (i)Object with more specific heat (ii)Change in the FACTOR FORMULA : Heat = mass of water X specific heat x change in temperature = m x c x `Delta`T Solution: Heat given to A =Heat given to B `m_Axxc_AxxDeltaT_A = m_Bxxc_BxxDeltaT_B` `1 xx c_A xx 3 = 1 xx c_B xx 5` `3c_A=5c_B` `c_A/c_B=5/3` Hence , specific heat of A is greater than specific heat of B. Also , specific heat of A is greater than specific heat of B by a factor of `5/3` |
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| 7663. |
Though wood is a renewable source of energy, but the use of wood as fuel is not a wise decision. Explain. |
| Answer» Solution :Wood is a renewable source of energy . It is obtained by cutting trees. A new plant sapling usually TAKES more than 15 years to grow and mature into a tree . Therefore , replenishment of cut down trees takes a very long time. Cutting down of trees causes depletion of the forests leading toimbalance in NATURE. Due to UNSUITABLE air and the above reasons, USAGE of wood as a source of energy is not a wise DECISION. | |
| 7664. |
A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens. a) At what distance from the film should the lens be adjusted to obtain a sharp image of the flower? b) What would be the diameter of the image of the flower of the film? c) What is the nature of camer lens? |
| Answer» SOLUTION :a) `v=+6.66 CM`, The film should be at a DISTANCE of `6.66` cm behind the CAMERA lens B) `1.66` cmc) Convex lens | |
| 7665. |
Can you find the work done by the electric force ? |
| Answer» Solution :Yes, with the HELP of the FORMULA `W=F_(E)l` . We can find the work DONE by the electric field. | |
| 7666. |
"_____________" is observed as word Biodiversity Day. |
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Answer» `5^(TH)` June |
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| 7667. |
From the elements Li, K, Mg, C, Al, S identify the elements belonging to the same group. |
| Answer» Solution :LI and K BELONG to the same GROUP i.e., group 1 | |
| 7669. |
A student took four test tubes I, II, III and IV containing aluminium sulphate, copper sulphate, ferrous sulphate and zinc sulphate solutions, respectively. He placed an iron strip in each of them. In which test tube, a brown deposit is formed? |
Answer» Solution : A brown DEPOSIT is formed in TEST tube II because iron being less reactive does not displace metals from the solution of `Al_(2)(SO_(4))_(3),FeSO_(4)` and `ZnSO_(4)`but it is more reactive than Cu. So, it displaces COPPER from `CuSO_(4)` and forms `FeSO_(4)` which is GREEN in colour and a brown deposit of copper metal. 
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| 7670. |
The deviceused for producingelectric currentis called a…….. |
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Answer» GENERATOR |
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| 7671. |
A ray of light travelling from a medium X enters obliquely into another medium Y. If it bends away from the normal then state which one of the two is relatively optically denser ? Why ? |
| Answer» Solution :MEDIUM X is OPTICALLY DENSER and Y is optically RARER. | |
| 7672. |
Explain the working process and applications of SONAR. |
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Answer» Solution :1) SONAR STANDS for Sonographic Navigation and Ranging. 2) This is a method for deetecting and finding the distance of objects under water by means of reflected ultrasonic waves. Working of SONAR : 1) SONAR system consists of a transmitter and a detector in the "Observation Centre" on board of aship. 2) From the observation centre,ultrasonic waves of high frequencyare sent in all directions under the water through transmitter. 3)These waves travel in straight lines till they hit an object such as a submarine, a sunken ship etc. 4) The waves are then reflected and are received back by the receiver at the observation centre. 5) The study of these reflected waves gives information about the direction of the object located. 6) The time between sending ultrasonic waveand receiving its echo, the distance of the object is calculated. 7) Reflections from various angles can be utilized to determine the SHAPE and size of the object. MATHEMATICAL expression : 1) Let 'd' be the distance between SONAR and an underwater object. 2) 't' be the time between sending an ultrasonic wave and receiving its echo. 3) 'u' be the speed of sound in water. The total distance covered by the wave from the SONAR to theobject and back is2d. 5) From the equation `s - UT implies 2d = ut implies d = (ut)/(2)`. Application : Marine geologists use this method to determine the depth of the seaand to locate underwater hills and valleys. 
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| 7673. |
A ray of light falls normally on a glass slab. Draw a diagram showing the path of the ray till it emerges out of the slab. What is the angle of incidence and angle of refraction at each surface of slab ? |
Answer» Solution :The ray diagram is shown in figure. In which the light ray passes undeviated through the SLAB.  At each surface of GLASS slab, ANGLE of incidence=0 ang angle of refraction=0 |
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| 7674. |
A coil made of insulated copper wire is connected to a galvanometer. What will happen to the deflection of the galvanometer if a bar magnet is pushed into the coil and then pulled out of it? Give reason for your answer and name the phenomenon involved. |
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Answer» Solution :TAKE a coil AB of insulated copper wire having ANUMBER of turns. Connect the ENDS of coil to a sensitive galvanometer . Now take a bar magnet NS and rapidly bring the magnet towards the end B of coil as shown in Fig. 13.24. The galvanometer gives momentary deflection in one direction. Now take the magnet away from the coil, the galvanometer again gives momentary deflection but in the opposite direction. It clearly shows that motion of magnet induces, a current in the coil. Again keep the magnet fixed and GENTLY move the coil AB either towards the magnet or away from the magnet. We get deflection in galvanometer even now. Thus, an induced current is PRODUCED in a coil whenever there is relative motion between the coil and the magnet. This phenomenon is known as the electromagnetic induction. 
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| 7675. |
Fig. shows the position-time graph of a particle of mass 4 kg. What is the Force on the particle for t lt 0, t gt 4s, 0 lt t lt 4s? (b) Impulse at t= 0 and t= 4s ? (Consider one dimensional motion only) |
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Answer» Solution :For `t lt 0.` No force as Particles is at rest. For `t gt 4s`, No force again particle comes at rest. For `0 lt t lt 4s,` as SLOPE of OA is constant so velocity constant i.e., a =0, so force must be ZERO. (B) IMPULSE at t= 0 Impulse =change in momentum `I=m(v-u)=4 (0-0.75)=3"kg ms"^(-1)` Impulse at t=4s `I=m(v-u) =4(0.075)=-3kg ms^(-1)` |
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| 7676. |
Are based on the table and the related information in passage given below. Thyroid Stimulating Hormone (TSH) stimulates thyroid gland to produce thyroxine. Study the table given below : It is important to monitor TSH levels during pregnancy. High TSH levels and hypothyroidism can especially affect chances of miscarriage. Therefore, proper medication in consultation with a doctor is required to regulate/control the proper functioning of the thyroid gland. Give the full form of TSH. |
| Answer» SOLUTION :THYROID STIMULATING HORMONE. | |
| 7677. |
Outof thefollowing_______ is thepropermethodformeasuringthe temperatureofwater . |
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Answer»
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| 7678. |
Are based on the table and the related information in passage given below. Thyroid Stimulating Hormone (TSH) stimulates thyroid gland to produce thyroxine. Study the table given below : It is important to monitor TSH levels during pregnancy. High TSH levels and hypothyroidism can especially affect chances of miscarriage. Therefore, proper medication in consultation with a doctor is required to regulate/control the proper functioning of the thyroid gland. A pregnant woman has TSH level of 8.95 mU/L. What care is needed for her ? |
| Answer» SOLUTION :A TSH level of 8.95 mU/L in pregnancy is very high and she will NEED MEDICATION to BRING it down. | |
| 7679. |
At constant temperature volume is inversely proportional to pressure of a gas is known as |
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Answer» CHARLE's LAW |
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| 7680. |
Are based on the table and the related information in passage given below. Thyroid Stimulating Hormone (TSH) stimulates thyroid gland to produce thyroxine. Study the table given below : It is important to monitor TSH levels during pregnancy. High TSH levels and hypothyroidism can especially affect chances of miscarriage. Therefore, proper medication in consultation with a doctor is required to regulate/control the proper functioning of the thyroid gland. Why do TSH levels in pregnant women need to be monitored ? |
| Answer» SOLUTION :TSH levels in pregnant women is essential to MONITOR and maintain because low thyroxine and high TSH results in MISCARRIAGE. So to protect the developing foetus, TSH level must be maintained. | |
| 7681. |
Are based on the table and the related information in passage given below. Thyroid Stimulating Hormone (TSH) stimulates thyroid gland to produce thyroxine. Study the table given below : It is important to monitor TSH levels during pregnancy. High TSH levels and hypothyroidism can especially affect chances of miscarriage. Therefore, proper medication in consultation with a doctor is required to regulate/control the proper functioning of the thyroid gland. State the main function of TSH. |
| Answer» Solution :TSH STIMULATES thyroid gland to PRODUCE THYROXINE. | |
| 7682. |
Action and reaction forces do not balance each other. Why. ? |
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| 7683. |
Enumerate any four functions of blood. |
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Answer» Solution :(a) DNA is a polynucleotide. Each nucleotide CONTAINS (i) A sugar MOLECULE - Deoxyribose sugar (ii) A NITROGENOUS base. They are two types of nitrogeneous bases. They are 1. Purines (Adenine and Guanine) `""` 2. Pyrimidines (Cytosine and Thymine) (iii) A phosphate group Nucleoside = Nitrogen base + sugar Nucleotide = Nucleotide + Phosphate Purines and Pyrimidines are linked by hydrogen bonds. Adenine (A) links thymine (T) with two hydrogen bonds (A = T) Cytosine (C) links Guanine (G) with three hydrogen bonds `(C equiv G)` (b) Functions of BLOOD: (i) Transport of respiratory gases (Oxygen and `CO_(2)`). (ii) Transport of hormones. (iii) It maintains proper water BALANCE in the body. (iv) It acts as buffer and also helps in regulation of pH and body temperature. |
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| 7684. |
What makes things visible? |
| Answer» Solution :In a lighted room, when light FALS on an object, it gets EITHER partially or completely REFLECTED. This reflected light when received by our eyes, enablesus to see things. | |
| 7685. |
How does the strength of the magnetic field at the centre ofcircular coil of wire depend on [i] the radiusof the coil, [ii] the number of turns of wire in the coil, and [iii] the strength of current flowing in the coil ? |
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Answer» Solution :i] It is inversely proportional to the radius of the COIL. B `prop` 1/r ii] It is directly proportional to the number of TURNS n of the coil. As the direction of CURRENT in each circular TURN is same, the fieldsdue to the various turns get added up. B `prop` n iii] It is directly proportional to the strength of current passing through the coil B `prop` l |
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| 7686. |
(a) Name the factors on which deviation of a ray of light through a prism depends. (b) Name the factors on which (angular) dispersion of light through a prism depends. |
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Answer» Solution :(a) The deviation of a ray of LIGHT passing through a PRISM depends on angle of prism, NATURE of material of the prism and angle of INCIDENCE of the ray. (b) (ANGULAR) dispersion of light through a prism depends on angle of prism and nature of material of the prism. |
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| 7687. |
Social health |
| Answer» Solution :ABILITY of a person to establish the POSITIVE RELATIONSHIP with other persons and developing a strong personality is called SOCIAL health. | |
| 7688. |
Give one reason for not using a seriesarrangement for domesticcircuits. |
| Answer» Solution :If ONE of the APPLIANCES does not WORKAND consequently the circuitbecomes incomplete other APPLIANCE in thedomesticcircuit will stop WORKING . | |
| 7689. |
Explain with diagram step-by-step energy conversion in Solar thermal power plant |
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Answer» Solution :a.In a solar thermal power plant, sunlight is USED as the source of ENERGY. b.Conversion of solar energy from sun to thermal energy :The solar energy from the solar radiations is converted into heat energy with the help of solar panels. c. Conversion ofthermal energy to kinetic energy in STEAM :This heat energy is used to generate steam which is directed on the blades of the turbine. d.Conversion of kinetic energy in steam to kinetic energy inturbine:The kinetic energy produced in thesteam is then used to drive the turbine. e.Conversion of kinetic energy in turbine toelectrical energy:The turbine rotates the GENERATOR CONNECTED to it which in turn produces electrical energy. 
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| 7690. |
Medha observed that the tubelights in the corridor of her school were always switched on the whole day. She brought the matter to the notice of her class teacher who talked to the Principal about it. The Principal took immediate action. Medha helped this way to reduce air pollution. Explain how. |
| Answer» SOLUTION : Power / Electricity PRODUCTION involves BURNING of fossil fuel. Electricity SAVED is fuel saved. LESS fuel burnt means less air pollution. | |
| 7691. |
Medha observed that the tubelights in the corridor of her school were always switched on the whole day. She brought the matter to the notice of her class teacher who talked to the Principal about it. The Principal took immediate action. What values do you learn from Medha in this episode? |
| Answer» SOLUTION :COURAGE. APPRECIATION and PROTECTION of ENVIRONMENT. | |
| 7692. |
It is said, 'Excess of everything is bad'. Examine the following situations in the light of above statement. (a) A plant is watered 4-5 times a day excessively. {b) A person overeats for more than 6 months. (c) A student watches television for 6 hours a day regularly. Answer the following questions based on the above information: (i) Which life sustaining values are getting neglected in the above situations? (ii) What are the adverse effects of activity (c) above? How can the adverse effect of this activity (c) be minimised? (iii) Suggestive one more similar situation from everyday which should be avoided. |
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Answer» Solution :(i) Respect for nature of LIFE PROCESSES. (II) Damage to eyesight, environmental degradation due to excessive use of electricity, minimising the TIME for watching TELEVISION. (iii) Overuse of electronic gadgets/oversleeping/excessive intake of medicines for minor problems. |
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| 7693. |
Medha observed that the tubelights in the corridor of her school were always switched on the whole day. She brought the matter to the notice of her class teacher who talked to the Principal about it. The Principal took immediate action. What steps can the school take to get ~ electricity consumption reduced? |
| Answer» SOLUTION : ( i )Students should switch off the lights while GOING out of their class. (II) they should not waste water as it also involves the USE of electricity many a times. | |
| 7694. |
Name two combustible compounds of biogas. |
| Answer» SOLUTION :METHANE and HYDROGEN are two combusttible components of biogas. | |
| 7695. |
Explain Simple microscope and Compound microscope. Also differentiate between them. |
Answer» SOLUTION :
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| 7696. |
Probiotics : |
| Answer» Solution :(1) PROBIOTICS form the colonies of useful BACTERIA in the alimentary, canal. (2) Probiotics help in IMPROVING resistance and immunity. (3) They control the metabolic ACTIVITIES. (4) The useful bacteria which have become inactive due to antibiotic treatment, are again activated due to probiotics. | |
| 7697. |
What is the commercial unit of electricalenergy? |
| Answer» SOLUTION :The KILOWATT HOUR, i.e., KWH | |
| 7698. |
TheVolumeoccupied by 1 moleof adiatomicgasat S.T.Pis _______. |
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Answer» 11.2 litre |
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| 7699. |
Assertion: The ionision power of beta-particle is less compared to alpha-particle but their penetrating power is more. Reason: The mass of beta-particle is less than the mass of alpha-particle. |
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Answer» If both the ASSERTION and the REASON are true and the reason is the correct explanation of the assertion. |
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| 7700. |
Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the directionof magnetic field? |
Answer» Solution : The current DUE to moving electron beam is in a DIRECTION opposite to MOTION. The force on electron is towards right. By Fleming.s left hand rule, the direction of magnetic field is vertically downward. |
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