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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.
| 4651. |
The Polymer of nucleotide. |
| Answer» SOLUTION :D.N.A./R.N.A | |
| 4653. |
Four students measured the reading by observing the position of pointer on the ammeter scale as shown below : Assuming that the ammeter has no zero error, the correct reading is : |
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Answer» 1.25 A |
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| 4654. |
You have the following appliances each of 500 W running on 220 V a.c. (1) electric iron (2) electric lamp (3) electric room heater The electric resistance is |
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Answer» maximum for ROOM HEATER |
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| 4655. |
Prove that i = e, If the angle of incidence and angle of emergence subtended by a light ray falling on a surface of glass slab are i and e respectively. How much angular deviation is suffered by the incident ray. |
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Answer» Solution :In the FOLLOWING FIGURE, `SR || PQ` and NM is the REFRACTED ray. HENCE, `r = i_(1)`. Now, `._(g)n_(a) = sin i//sin r ` and `._(a) n_(g) = sin i_(1)//sin e `  Also `._(g)n_(a) = ( 1)/(._(a)n_(g))` `:. ( sin i)/(sinr ) = ( sin e )/(sin i_(1))` As ` r = i_(1)` , it follows that `sin i = sin e ` `:. i = e ` |
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| 4656. |
Two or more forces of equal or unequal magnitude acting along the same direction parallel to each other are called……………… |
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Answer» LIKE parallel forces |
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| 4658. |
Power of the lens=p=I/f |
| Answer» Solution :The FOCAL length of a lens is f then its reciprocal (I/t) is CALLED the power of the lens. So Power of the lens = p = 1/f. When f is measured in metres then power of the lens is in dioptres. the unit of power "dioptre" is DEFINED as the power of a lens of focal-length one metre. Its SYMBOL is .D.. | |
| 4659. |
How does the energy of a simple pendulum vary as it moves from one extreme position to the other during its ocilllations? |
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Answer» Solution :The TOTAL energy of a simple pendulum is, `E=1/2mA^(2)((g))/(l)(or)E=1/2(mg)/(l)A^(2)` The above equation, shows that the total energy of a simple pendulum remains constant irrrespective of the position at any time during the oscillation i.e., the law of conservation of energy is valid in the case of a simple pendulum. At the extreme position O it is totally converted as kinetic energy. At any other point the sum of the POTENTIAL and kinetic energy at the mean position or MAXIMUM potential energy at the extreme position. As the bob of the pendulum moves from P to O, the potential energy decreases but appears in the same magnitude as kinetic energy. SIMILARLY as the bob of the pendulum moves from O to P or Q, the KINECTIC energy decreases to the extent it is converted into potential energy. as shown in figure. 
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| 4660. |
In the spacecraft, travellers and objects appear floating. |
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Answer» SOLUTION :i.Though the spacecraft is taken to a huge height from the Earth, thevalue of acceleration DUE to GRAVITY does not become ZERO. ii. The weightlessness is because the spacecraft is in a state of free fall. iii. Any object in a state of free fall will feel weight lessness. |
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| 4661. |
In beta - decay the atomic number increases by ……….. unit and mass number ................. |
| Answer» SOLUTION :ONE, REMAINS same+2e | |
| 4662. |
A student has difficulty reading the backboard while sitting in the last row. What could be the defect the child is suffering from ? How can it be corrected ? |
| Answer» Solution :As the child has difficulty in READING the blackboard, he is suffering from myopia or SHORT SIGHTEDNESS. To correct this DEFECT, he has to use spectacles with concave lens of suitable FOCAL length. | |
| 4663. |
In the spectrum of white light, which colour is deviated maximum ? (a) Red (b) Yellow (c ) green (d) Violet |
| Answer» Solution :(a) Violet. The actual SPECTRUM of white LIGHT is in the order VIBGYOR. In prism, the order is REVERSED. | |
| 4664. |
What will be the effect of industry established on river bank on the river ecosystem? |
| Answer» Solution :If there are industries established on the river bank, then there is a threat to the aquatic ecosystem. It is most likely that the hazardous effluents can be released into the river water. This can cause water pollution resulting in MORTALITY of aquatic organisms. Moreover, this water will no longer remain potable. Hence, the health of RESIDENT population may also be affected. The FOOD chains and the food WEB in the river may be terminated DUE to such pollution. | |
| 4665. |
Assertion (A): Alloys are commonly used is electrical heating devices like electric iron and heater. Reason ( R): Resistivity of an alloy is generally higher than that of its constituent metals but the alloy have lower melting point then their constituent metals. |
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Answer» Both (A) and (R ) are true and (R ) is correct explanation of the assertion |
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| 4666. |
Identify thepoles of the magnetis the given See Fig.13.11 (i) and (ii). |
Answer» SOLUTION :SEE the FIG 13.12 (i) and (II). 
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| 4667. |
Discuss themagnetic field dueto a current-carrying circular loop. |
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Answer» Solution :Whena currentis passed through a circular LOOP , a magenticfield is produced aroundit . The patter fromedby the magnetic field line of themagneticfield due toacurrent - carrying circular loop is shown in figure  Themagnetic field lines of the fieldproducedby a current- carryingcircular loop are circularandconcentricnear the loop . As we move away from wire , theconcentriccircles representingthe magneticfieldaroundit becomesang larger . (The magnetic fieldis proportional to thecurrentand decreases as wemoveaway from the loop ). When we reachat the centreof thecircularloop, the arcs of thesebig circles would apper as a straight line . Here every point on thecircularwire carrying currentwould give rise to the magnetic fieldapperingas straigth linesatthe magneticfield appearing as straight lines ATTHE centreoftheloop . By applyingthe Right- handthumb rule ,it can be seen that every section of thewireproduces magneticfield/ field lines in the same direction within the loop. Hence , at the centre of the circular loop, all the magneticfield lines are in the same directionand aid each other due to which the strenght of themagneticfieldincreases. In caseof a current - carryingcircular coil havingN turns, the magneticfield produced is N times as large as that produced by a coil HAVINGSINGLE turn ,assumingthat all turns havenearly the sameradius. Thisis because the currentin eachcircular turns has the samedirection and the fielddue to each turn then justadd up . Thus, magntidueof the magneticfield B produced at the centreof the coilis: (1) Directlyproportional to the currnetI flowingthrough it , i.e.,`B prop I` (2) Inversly proportional to theradiusr of the coil , i.e., `B prop (1)/(r)` . (3) Directly PROPOTIONAL to total numberof turns N of the coil , i.e., `B prop N ` . |
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| 4668. |
Differentiate the eye defects : Myopia and Hypermetropia . |
Answer» SOLUTION :
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| 4669. |
Where you will create category of blocks ? |
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Answer» BLOCK menu |
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| 4670. |
When a ray strikes the pole or optic centre of the concave or convex lens it gets deviated. |
| Answer» Solution :Correct statement- When a ray strikes the pole or OPTIC CENTRE of the CONCAVE or CONVEX lens it GETS no deviation. | |
| 4671. |
Which of the following is an example of internet? |
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Answer» Mail |
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| 4672. |
What should be the minimum wind speed to maintain the required speed of the turbine in a wind energy farm ? |
| Answer» SOLUTION :`15 km//h`. | |
| 4673. |
What do you mean by earthing ? Why should electrical appliances be earthed ? |
| Answer» Solution :Earthing is a process with which we SEND the ELECTRICITY into the earth. This is done with the help of earth wire. It avoids risk of ELECTRIC shock. For earthing a wire is connected to the COVER of vessel on one side and to the earth point is buries deep in the earth. Earth wire is USUALLY green or green - yellow coloured. | |
| 4674. |
Darwin's work on evolution has been a milestone . |
| Answer» SOLUTION :(1) Darwin has proposed two very important theories of evolution, viz. Theory of NATURAL selection and Theory of origin of species. (2) The evolution has taken place on the earth for lastmany crores of YEARS. (3) The exact nature andprocess of these evolutionary changes become clear after studying Darwinism. (4) The observations made by Darwin at that time are now tested according to the modern development in science and arefound to be correct. Thus, his work issaid to be a milestone. | |
| 4675. |
When three resistors are connected in series then the value of the effective resistance is |
| Answer» Solution :Correct STATEMENT : CURRENT is more as EFFECTIVE resistance is less. | |
| 4676. |
what are escape velocity |
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Answer» Solution :Escape velocity: The minimum initial velocity needed by an object PROJECTED upwards, to overcome Earths GRAVITATIONAL FORCE and not FALL BACK on Earth is called escape velocity. |
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| 4677. |
Universal gravitational constant (a) G = 6.684 xx 10^(-10) Nm^(2) kg^(-1) |
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Answer» `G =7.4 XX 10^(-10) Nm^(2)` |
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| 4678. |
State the rule to determine the direction of a (i) magnetic field produced around a straight conductor-carrying current (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it and (iii) current induced in a coil due to its rotation in a magnetic field. |
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Answer» Solution :(i) The direction of magnetic field produced around a current-carrying conductor is given by right hand thumb rule. If the conductor carrying current is HELD in the right hand in such a way that the thumb POINTS in the direction of current, then direction of curl of fingers gives the direction of the magnetic field. (ii) The direction of force experienced by a straight conductor carrying current placed in a magnetic field, which is perpendicular to it is determined by Fleming.s left hand rule. Hold the thumb and first two fingers of the left hand at right angles to each other with the first finger pointing in the direction of the Field and the second finger in the direction of the current, then the thumb points in the direction of the motion. (iii) The direction of current induced in a circuit by changing magnetic flux DUE to motion of a magnet is determined by Fleming.s right hand rule. If we stretch our right hand in such a way that the thumb, forefinger and CENTRAL finger remain perpendicular to each other, so that the forefinger indicates the direction of the magnetic field and the thumb in the direction of motion of conductor, then the central finger indicates the direction of induced current. |
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| 4679. |
The centre of gravity of a uniform ball is: |
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Answer» at is GEOMETRICAL CENTRE |
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| 4680. |
Name the device that helps to maintain a potential difference anO!I~ a cnnductnr. |
| Answer» Solution : A BATTERY is USED to maintain POTENTIAL DIFFERENCE across a CONDUCTOR. | |
| 4681. |
Out of the following energy sources, which has the least consumption for electrical power generation in the world? |
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Answer» COAL |
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| 4682. |
FRAGMENTATION |
| Answer» Solution :Fragmentation is the asexual type of REPRODUCTION in which the body of PARENT organimsm breaks up into many fragments. Each FRAGMENT can start LIVING independently. | |
| 4683. |
What will be the frequency sound having 0.20 m as its wavelength, when it travels with a speed of 331ms^(-1)? |
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Answer» SOLUTION :FREQUENCY of sound. `=("velocity of sound")/("WAVELENGTH of sound")` `n=(v)/(LAMDA)=(331)/(0.20)` `n=1655Hz` |
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| 4684. |
Whatis the shape of a current- carryingcondcutorwhosemagnetic fieldpatter resembles that of a bar magnet ? |
| Answer» SOLUTION :A soleonid COIL. | |
| 4685. |
Velocity-time graph AB(Fig. 2.2) show that the body has |
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Answer» uniform ACCELERATION |
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| 4686. |
Mental stress, addiction, lingering in nature, incurable diseases. |
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Answer» SOLUTION :LINGERING in natuer All other are factors which disturb social HEALTH, while lingering in nature is a method of RELIEVING stress. |
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| 4687. |
Can you guess the reason why sun does not appear red during noon hours ? |
| Answer» Solution :During noon hours, the distance to be traveled by the SUN rays in atmosphere is less than when COMPARED to morning and evening hours. THEREFORE all colours reaches our eye without scattering . Hence light APPEAR WHITE in noon hours. | |
| 4688. |
State the importance of Newton's universal law of gravitation . |
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Answer» Solution :The importance of Newton's universal LAW of gravitation : The law explains successfully, i.e., with greate accuracy, (1) the force that binds the OBJECTS on the EARTH to the earth (2) the MOTION of the moon and artificial satellites around the earth (3) the motion of the planets, asteroids, comets, etc., around the Sun (4) the tides of the sea DUE to the moon and the Sun. |
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| 4689. |
Why do your spectacles steam up, when you enter a warmroom after being outside on a frosty early morning ? |
| Answer» Solution :(1) On a frosty early morning , the temperature of air OUTSIDE a warmroom is lower than the dew point. (2) Hence, when you enter the room from outside , some water VAPOUR in the room condenses on the glass of your spectacles, i.e., the spectacles 'steam up'. | |
| 4690. |
When latent heat of phase transformation from solid to gaseous state is studied for ice, for temperature range of 20^(@) C " to " 80^(@)C, graph of temperature versus time is |
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Answer» LINEAR. |
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| 4691. |
What is blind spot ? |
| Answer» SOLUTION :The region of the retina where the OPTIC NERVE ENTERS the eye is called the blind SPOT. It contains no light-sensitive cells and hence vision is not possible in this region. | |
| 4692. |
Gather information about major solar photovoltaic power generatingplants and their capacity in India. |
Answer» SOLUTION : 
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| 4693. |
…… : Dwarfness : : Factor VIII : Haemophilia. |
| Answer» SOLUTION :SOMATOSTATIN | |
| 4694. |
Answer the question : Explain with example. |
| Answer» SOLUTION :For example, misuse or ILLEGAL sale of WRITTEN LITERATURE, photos, music videos of others obtained from internet might fetch fast and EASY money but is a cybercrime. | |
| 4695. |
What is the value of g at the centre of the Earth? |
| Answer» Solution :At the centre of the EARTH the VALUE of G is ZERO. | |
| 4697. |
Mention why is it not possible to make use of solar cells to meet all our energy needs ? State three reasons to support your answer. also mention three use of solar cell. |
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Answer» Solution :It is not possible to make use of solar cells to melt all our energy needs because, Limited availability of special grade semiconducting materials such as silicon and germanium Solar cell have lower EFFICIENCY as they depend entirely on intensity of solar radiation The process of manufacturing of solar cells is very expensive silver used for inter connection of cell in the PANEL further add to the cost. Uses of solar cell :*They provide electric power to satellites and SPACE probes. * They provide electric power to offshore drilling plants from light houses. * The T.V relay stations located in remote area use solar PANELS to get electric power for wireless transmission. |
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| 4698. |
Fill in the blanks and explain the statements with reasoning: If the height of the orbit of a satellite from the earth is surface is increased, the tangentialvelocity of the satellite will ... ..... ... . |
| Answer» Solution :Decrease. As the DISTANCE between EARTH and SATELLITE INCREASE, the velocitydecrease. | |
| 4699. |
State the two forms of energy in which energy is mainly utilised at our homes. |
| Answer» SOLUTION :(i) HEAT ENERGY , an (II) LIGHT energy . | |
| 4700. |
What is joule ? |
| Answer» SOLUTION :One joule is DEFINED as the work DONE when a force of 1N is applied on an body to PRODUCE a DISPLACEMENT of one metre. | |