InterviewSolution
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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.
| 6501. |
(a) What are magnetic field lines ? How is thedirection of magnetic field at a point in a magnetic field determined using field lines ? (b) Two circular coils X and Y are placed close to each other. IF the current in the coilX is changed, will some current be induced in the coil Y ?Give reason. (C) State " Fleming'sright hand rule . |
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Answer» Solution :(a) Megnetic field lines are the lines drawn in a magnetic field along which a north magnetic pole would MOVE. Magnetic field LINE are also known as magneticf lines of force. Direction of magnetic field lines is determined by the following activity. A bar magnet is placed on a sheet of paper and its boundary ismarked with a pencil. A magnetic composs is brought NEAR the N-pole of the bar magnet.It is observed that N-poleof magnet repels the N-pole of compass needle due to which the tip of the compass needle moves aways from the N-pole . Thus a magneticfield pattern is obtained arounda bar magnet. Each magnetic field line is directed from the north poleof a magnet . the strength of magnetic field is indicated by the degree of closeness of the field lines. So themagnetic field is the strongest near the poles.  (b) Two circular coils X and Y are placed close to each other. If the current in coil X is changed, the mangnetic field associated with is also changes around the coil Y placed near it . This change in magnetic field induces a current in the coil Y. When the current in coil X is switched on , it becomes an electromagnet and produces a magnetic field around coil Xis switchedoff, its magnetic field in coil Ystops quickly. This effect is just the same as pulling a magnet quickly out of the coil Y , an inducedcurrent flows in coil Y in the oppsite direction. (C) Fleming right hand rule .Hold the thumb, the forefinger and the centre finger of your hand at right angles to one another. Adjust your hand is such a way that forefinger PIONTS in the direction of magnetic field, and thumb points in the direction of motion of conductor, then the direction in which centre finger points gives the direction of induced current in the conductor. |
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| 6502. |
Draw a diagram to show the magnetic field lines around a bar magnet List any two properties of magnetic field lines. |
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Answer» Solution :(i) Two magnetic field lines NEVER INTEREST each other. (ii) Outside the magnet, the magnetic field lines are DIRECTED from North pole of magnet towards South pole.  |
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| 6503. |
A radon specimen emits radiation of 3.7xx10^(3)GB q pe second. Convert this disintegration in terms of curie. (one curie=3.7xx10^(10) disintegration per second) |
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Answer» Solution :1 BQ = one disintegration PER second , one curie = `3.7 xx 10^(10)`Bq `1Bq= (1)/(3.7 xx 10^(10))` curie ` therefore 3.7 xx 10^(3) GBQ= 3.7 xx 10^(3) xx 10^(9) xx (1)/(3.7 xx 10^(10))` = 100 curie |
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| 6504. |
One of the following is not a vector quantity. This one is : |
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Answer» displacement |
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| 6506. |
………………… are the few light sencitive cells found on retina. |
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| 6507. |
Observe the following chemical equations and identify the correct statement. (i)CuSO_4 + Fe to FeSO_4 + Cu (ii)2AgNO_3 + Cuto Cu (NO_3)_2 + 2Ag |
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Answer» COPPER is more REACTIVE than IRON and SILVER |
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| 6508. |
With propogation of longitudinal waves through a medium the quantity transmitted is |
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| 6509. |
Whatis the shape of thefieldline of a magneticfield passingthrough the centre ofa current- carryingring ? |
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Answer» circular |
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| 6510. |
A wire of resistivity p is pulled to double its length. What will be its new resistivity? |
| Answer» SOLUTION :Resistivity remains UNCHANGED because resistivity depends on NATURE of MATERIAL not on length. | |
| 6511. |
To simulate car accidents, auto manufacturers study the collisions of moving cars with mounted springs of different constants. Consider a typical simulation with a car of mass 1000 kg moving with a speed 18.0 kmh^(-1) on a smooth road and colliding with a horizontally mounted spring of spring constant 6.25xx10^(-3)Nm^(-1). What is the maximum compression of the spring. |
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Answer» Solution :At maximum COMPRESSION `x_(m)`, the K.E. of the car is converted entirely into the P.E. of the spring. `1/2kx_(m)^(2)=1/2mv^(2)` or `x_(m)=2m` |
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| 6512. |
Complete the following reaction. (a) PCl_(3)+Cl_(2) to ? (b) SiO_(2)+...... to CaSiO_(3) |
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Answer» Solution :`(a) PCl_(3)+Cl_(2) to PCl_(5)` (b) `SiO_(2) + CAO to CaSiO_(3)` |
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| 6513. |
The potential difference across the terminals of a cell is 1.5 volt.It is connected with a resistance of 30ohms. Calculate the current flowing through the circuit. |
| Answer» SOLUTION :CURRENT `I=(Potential dif f erence V)/(RESISTANCE R)=(1.5 V)/(30 OMEGA)=0.05A` | |
| 6514. |
A: Pupil appears black in colour. R: Any light falling on it goes into the eye and there is no chance of light coming back to the outside. |
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Answer» 'A' and 'R' are CORRECT, 'R' SUPPORTS 'A'. |
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| 6515. |
A uniform chain of length 2m is kept on a table such that a lengthof 60 cm hangs freely from the edge of the table. The total mass of the chain is 4kg. What is the work done in pulling the entire chain on the table? |
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Answer» 7.2 J Mass of 60 cm length `=1.2 kg` WEIGHT of hanging part `=1.2xx10=12N` `W=FxxS=12xx0.3=3.6J` |
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| 6516. |
Explain the magnetic effects of current with the help of an activity. along with labelled diilgram. |
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Answer» Solution :TAKE a thick sttaight ropper wire and place it between the points X and Y in an electric circuit. Place a small compass near to this wire. See the position of its needle. Pass the current through the circuit by inserting the key into the PLUG. Observe the change in the position of the compass needle. (Compass needle is deflected on passing an electric current through a metallic CONDUCTOR ) 
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| 6517. |
What is diastema? |
| Answer» SOLUTION :In RABBITS, the GAP between the incisors and premolar is known as diastema. | |
| 6518. |
Explain why the planets do not twinkle? |
| Answer» Solution :Planets are much CLOSER to the earth and are seen as extended sources. So, a planet may be CONSIDERED as a COLLECTION of a large number of point-sized light source3s . Although light coming from INDIVIDUAL point -sezedsources flickers but the total amount of light entering our eye from all the individual point-sized sources avereage out the to be constant. Thereby planets appear equally bright and there is no TWINKLING of plantes. | |
| 6519. |
For three circuits, shown here the same two resistors R_(1) and R_(2) have been connected in parallel in all the circuits but the voltmeter and the ammeter have been connected in three different positions. The relation between the three voltmeter and ammeter readings would be : |
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Answer» `V_(1) = V_(2) = V_(3)` and `I_(1) = I_(2) = I_(3)` |
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| 6520. |
(a)Whatis an electromagent? Draw a circuitdiagram to showhow a soft iron piece can betransformed into an electromagnet ? (b) Statetwo waysby whichthe strenghtof an electromagnetcan be increased. |
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Answer» Solution :(a) An electromagentis a ROD of magnetic(say soft iron) placedinsidea solenoidcoil . On passingcurrentin solenoidcoil , ion rodbegins to BEHAVE as a magnet. Onstoppingthe CURRENTFLOW, magnetisationof iron is lost . Thus , a soft iron piece behaveas an electromagnet . (b) Thestrenghtofan electromagnetcan beinscreased by . (i) increasingthe amountof turnsofwinding ofthe solenoid coil wrapped around theelectromagnetor . (ii)increasingthe amountof electric CURRENT flowingthrough the coil.  `)
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| 6521. |
Ironis _________. |
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Answer» morereactivethan ZINC |
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| 6522. |
Disperism of ______ colouris minimumin visiblerange of light . |
| Answer» Answer :A | |
| 6523. |
There is no definite information about indeterminate species. |
| Answer» Solution :(1) Indeterminate SPECIES do not have substantial information about them. (2) The organisms belonging to such species appear to be endangered due to their some behavioural HABITS. (3)They are shy and do not come in open so that they can be observedkeenly. (4) For EXAMPLE, ANIMALS like GIANT squirrel also do not provide such information. | |
| 6524. |
What is heating effect of electrical current? Give examples |
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Answer» Solution :When a resistor is connected in an electrical circuit, heat is produced in it due to the CURRENT. This is known as the HEATING effect of current. E.g water boiler, electric COOKER, electric bulb MAKE use of the heating effect of electric current. |
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| 6525. |
Astronautsare not floating but fallingfreely around the Earth due to theirhuge centripetal acceleration . |
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| 6526. |
Fleming's right hand rule gives |
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Answer» magnitude of the induced current. |
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| 6527. |
How much work is done when one coulomb charge moves against a potential difference is I volt? |
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Answer» SOLUTION :POTENTIAL DIFFERENCE = WORK done/charge VOLT = Joules/Coulomb `I=J//IrArrIxxI=JrArrJ=I` |
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| 6528. |
Space technology is an inevitable part for development of a nation. |
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Answer» Solution :1.Space technology plays a very crucial role in development of a nation. 2. Today, we can contact a person in any part of the world within a second. We can gather information about worldwide events SITTING at home. Due to internet, every information is available at our fingertips. 3. It has become POSSIBLE to get advance alert about natural calamities and take PROPER precautions. 4.During WAR, it is possible to get information about the actions of the enemy through aerial surveillance using satellites. 5. It is also possible to explore the fossil reserves and minerals in the earth. 6. Hence, space technology is an INEVITABLE part for development of a nation |
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| 6529. |
In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find : (i) the mechanical advantage, (ii) the velocity ratio, and (iii) the efficiency. |
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| 6530. |
Define and show in a diagram, the following terms relating to a concave mirrors.(i) Aperture(ii) Radius of curvature |
Answer» Solution :(i) The diameter of the REFLECTING surface of the MIRROR is called aperture. (ii) The RADIUS of the sphere of which the reflecting surface of the SPHERICAL mirror forms a part is called the radius of CURVATURE of the mirror. |
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| 6531. |
What is the difference between a resistor ~ and resistance? |
| Answer» SOLUTION :A resistor is a COMPONENT whereas resistance is its PROPERTY due to which it opposes the flow of ELECTRONS through it. | |
| 6532. |
State the function of the gear bear bor in a wind mill? |
| Answer» Solution :Ina wind mill , the funtion of the GEAR BOX is to increase the rotations per UNITTIME. | |
| 6533. |
Name the Indian states where paddy is cultivated on a large scale. |
| Answer» Solution :West Bengal, UTTAR PRADESH, HARYANA, Punjab, TAMIL Nadu, Andhra Pradesh, Bihar, Chhattisgarh, Odisha, Assam and Maharashtra. | |
| 6534. |
Children are facing the problems of lonelines and mental stress due to reasons like nuclear family and parents staying outdoors due to job. |
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Answer» |
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| 6535. |
What is the magnification of the images formed by plane mirror and why? |
| Answer» SOLUTION :Its MAGNIFICATION is +1 because plane mirror ALWAYS forms a laterally inverted IMAGE. | |
| 6536. |
Trace the sequence of events which occur when a bright light is focused on your eyes. |
Answer» SOLUTION :
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| 6537. |
An astronaut lands his spacecraft on the surface of moon and observes the sky. He will find the colour of sky as |
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Answer» DEEP blue |
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| 6538. |
A ball of mass 50 is thrown vertically upwards with an initial velocity of 20 ms^(1) Calculate: (i) in the initial kinetic energy imparted to the ball, (ii) the maximum height reached if air friction is neglected, and (iii) the maximum height reached if 40% of the initial energy is lost against the air friction.Take g=10 ms^(-2) |
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Answer» Solution :GIVEN :m =50g=`(50)/(1000)` kg =0.05 kg u=20 m `s^(-1)` ,g=10 m `s^(-2)` (i)Initial kinetic energy imparted to the ball `=(1)/(2)mu^(2)=(1)/(2)xx0.05xx(20)^(2)=10J` (ii)If AIR friction is negligible ,then POTENTIAL energy at the maximum height `therefore H=(v^(2))/(2g)=((20)^(2))/(2xx10)=20 m` (iii)If 40 % of the initial energy is lost against the air friction .then Potential energy at the maximum height or `mgh=(60)/(100)xx(1)/(2)mv^(2)` `therefore h=(0.6 v^(2))/(2g)=(0.6xx(20)^(2))/(2xx10)=12 m` |
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| 6539. |
How much water a pump of 2KW can raise in one minute to a height of 10 m? (g=10ms)? |
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Answer» 1000 litres |
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| 6540. |
List two advantages associated with water harvesting at the community level. |
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Answer» Solution :Water harvesting is a method of holding rainwater on the surface of the earth, to make it percolate under the ground so as to recharge groundwater. TWO ADVANTAGES associated with water harvesting at the community LEVEL are (i) Giving people control over their local water resources ensures that mismanagement is REDUCED. (ii) Over-exploitation of these resources is reduced. The water stored in the ground does not evaporate, provides MOISTURE for vegetation over a wide area, and is protected from contamination by human and animal waste. |
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| 6541. |
Draw the pattern of magnetic field formed around a current carrying solenoid. Compare this field to that of a bar magnet. |
Answer» SOLUTION :Magnetic FIELDS of a solenoid and a bar MAGNET are similar. 
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| 6542. |
Which six classes are included in subphylum Vertebrata ? |
| Answer» Solution :Subphylum VERTEBRATA is subdivided into Cyclostomata, PISCES , Amphibia , REPTILIA , AVES and MAMMALIA. | |
| 6543. |
The SI unit of resistance is: |
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Answer» volt |
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| 6544. |
The potential at a point is 20 V. The work done to bring a charge of 0.5 C from infinity to this point will be |
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Answer» 20 J |
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| 6545. |
(a) How can you identify the three types of mirrors without touching them ? (b) What do you mean by focal length of a spherical mirror ? |
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Answer» Solution :(a) STAND in front of mirror near it and look to your IMAGE. (i) If the image is erect and of same size and size of image does not CHANGE even if you move forward or backward, the mirror is a plane mirror. (ii) If the image is erect and diminished ONE, the mirror is a convex mirror. (iii) If the image is erect and magnified and becomes inverted if one moves away from the mirror, the mirror is a concave mirror. (b) Focal length of a spherical mirror is the distance between pole and principal focus of mirror. Thus focal length f = PE. |
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| 6546. |
The essential difference between an A.C. generator and a D.C. generator is that |
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Answer» A.C. generator has an electromagnet while a D.C. generator has permanent MAGNET. |
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| 6547. |
A student plots V-I graphs for three samples of nichrome wire with resistances R_1, R_2 and R_3.Choose from the following the statement that holds true for this graph. |
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Answer» `R_1 = R_2 = R_3` [Hint : SLOPE of I-V GRAPH GIVES the VALUE of `1/R`.] |
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| 6548. |
Explain the parallel combination of resistors and derive the formula of equivalent resistance. |
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Answer» Solution :Two or more than two resistors are said to be connected in parallel if one end of each resistor is connected to one point and the other end is connected to another point so that more than one paths are AVAILABLE for the current to flow and potential difference across each resistor is the same and is equal to the applied potential difference between the two common points. Three resistors with resistances, `R_1, R_2 and R_3` are connected in parallel between points A and B as shown in the figure 12.16 (a). Here. the current I gets divided at point A amongst three resistors as shown in the figure. The VALUE of the current FLOWING through each . resistor depends on the value of its resistance.  Let`I_1, I_2 and I_3` be the currents flowing through the resistors with resistances `R_1, R_2 and R_3`respectively. `:. I =I_1+I_2 + I_3` ... ... (12.12) In a parallel COMBINATION of resistors, thepotential difference across every resistor is equal < to the potential difference V of the battery.According to Ohm.s law, `I_1 = V/R_1 ,I_2 = V/R_2 and I_3 = V/R_3` `:. I_1 = V /R_1 + V/R_2 + V/R_3.......(12.13)` Now, if a resistor with resistance `R_p`, instead of three resistors with resistances `R_1, R_2 and R_3`,is connected in the circuit such that the current flowing through the circuit remains thesame as I then `R_p` is called the eqUivalent resistance of the circuit [see figure (b)). `I = V/R_p` ......(12.14) From equation (12.13). `V/R_p =V/R_1 +V/R_2 + V/R_3` `:. 1/(R_p)= 1/(R_1) + 1/R_2 + 1/R_3` Thus, in a parallel combination of resistors, the sum of the reciprocals of the individual resistances is equal to the RECIPROCAL of the eqUivalent resistance `R_p.R_p`is less than any of ? the individual resistances in the circuit. |
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| 6549. |
How is diastema formed in rabbit? |
| Answer» SOLUTION :Diastema is a gap between the incisors and PREMOLAR. It is formed DUE to the absence of canine. It helps in mastication and chewing of FOOD in herbivorous ANIMALS. | |
| 6550. |
Is the concept of latent heat applicable during transformation of gaseous phase to liquid phase and from liquid phase to solid phase ? If yes then explain how? |
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