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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.
| 4751. |
The vernier scale of a travelling microscope has 50 division which coincide with 49 main scale division. If each main scale division is 0.5 mm, calculate the minimum inaccuracy in the measurement of distance. |
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Answer» SOLUTION :Minimum INACCURACY = VERNIER constant = 1 MSD – 1 VS.D = 1 MSD –`(49)/(50)` MSD `=(1)/(50)(0.5mm)=0.01mm` |
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| 4752. |
(a) What is photosynthesis and where in a cell does it occur? (b) How can menstrual hygiene be maintained during menstrual days? |
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Answer» Solution :(i) Sanitary pads should be changed regularly, to AVOID infections, (ii) Use of WARM water to clean genitals HELPS to get rid of menstrual cramps. (iii) Wearing loose clothing rather than airflow around the genitals and PREVENT SWEATING, |
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| 4753. |
How does the resistance of a metallic Wire depend on its temperature? |
| Answer» SOLUTION :The RESISTANCE of a METALLIC wire INCREASES with temperature. | |
| 4754. |
Into which phyla is Non - chordata divided ? In which three subphyla are Chordates divided ? |
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Answer» Solution :The phyla of NON - chordata : (1) Protoza (2) Porifera(3) COELENTERATA or Cnidaria (4) Plathyhelminthes (5) Aschelminthes (6) Annelida (7) Arthropda (8) Mollusca (9) Echinodermata (10) Hemichordata II. The SUBPHYLA of Chordata : (1) Urochordata (2) Cephalochordata (3) Vertebrata |
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| 4755. |
A freely falling object travels 4.9 m in 1st second, 14.7 m in 2nd second, 24.5 m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of : |
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Answer» UNIFORM motion |
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| 4756. |
What would be the advantage of exploiting resources with short - term aims ? |
| Answer» Solution :Exploiting RESOURCES with SHORT - term aims PROVIDE immediate advantages that meet CURRENT basic human need . | |
| 4757. |
How do we perceive different colours? |
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Answer» SOLUTION :(i) The retina in our eyes is MADE up of many light sensitive CELLS. (ii) These cells are shaped LIKE a rod and like a CONE. (iii) The rod like cells respond to the intensity of light and give information about the brightness or dimness of the object to the brain. (iv) The conical cells respond to the colour and give information about the colour of the object to the brain. (v) Brain processes all the information received and we see the actual image of the object. (vi) Thus conical cells are responsible for perceiving different colours. |
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| 4758. |
Draw and label the structure of a human ovum. |
Answer» SOLUTION :
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| 4759. |
The electricity generated at the power stations is transmitted to distant places in high voltage. What is the voltage at which electricity is generated in the power station? |
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| 4760. |
The electricity generated at the power stations is transmitted to distant places in high voltage.What are the problems facing in Iong distant power transmission? |
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| 4761. |
The correct relationship between mechanical advantage (M.A.) velocity ratio (V.R.) and efficiency (eta) is: |
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Answer» `M.A.=etaxxV.R.` |
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| 4762. |
The essential different between an AC generator and a DC generator is that |
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Answer» AC generator has an electormagnet while a DC generator has permanent magnet. |
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| 4764. |
How does the rate of a reaction depend upon the catalyst ?Give a suitable example. |
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Answer» Solution :(1) The SUBSTANCE in whose in whose presence the rate of a chemical reaction changes, without causing any chemical change to it , is called a catalyset. (2) On heating potassium chlorate ` (KCIO_(3))`decomposes into potassium chloride and oxygen slowly. ` 2KCIO_(3) overset(Delta)to 2KCI + 3O_(2)...` The rate of the above reaction neither increases by reducing the particle size nor by increasing the reaction TEMPERATURE . However in the presence of MANGANESE dioxide , ` KCIO_(3)` decomposes at a comparatively lower temperature and oxygen is produced more briskly. No Chemical change takes place in ` MnO_(2)`in this reaction. It acts as catalyset. |
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| 4765. |
Study the following electric circuit (i) Calculate the current flowing in the circuit and (ii) Calculate the potential difference across 10 Omegaresistor |
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Answer» Solution :(i) `R= R_(1)+R_(2)=10+20=30 Omega` V=3 V (i) From ohm.s V= IR `3 =I xx30 implies I = (3)/(30)= (1)/(10)` Ampere or 0.1 A (ii) Potential DIFFERENCE across `10Omega` resistor V= IR `=(1XX10)/(10 ) ` = 1 volt . |
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| 4766. |
Find out the names of animals which communicate using infrasonic or ultrasonic sound and prepare a scrap book. |
Answer» SOLUTION :
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| 4767. |
What are the two possible causes of excessive heating of electric wires ? |
| Answer» Solution :OVERLOADING and short circuiting CAUSE EXCESSIVE HEATING of electric WIRES. | |
| 4768. |
An electric kettle for use on a 230 V supply is rated at 3000 W. For safe working, the cable connected to it should be able to carry at least: |
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Answer» 2A |
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| 4769. |
Define absolute refractive index and express it mathematically. |
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Answer» Solution :The ratio of the SPEED of light in air or vacuum to the speed of light in any medium is called the ABSOLUTE refractive INDEX. If 'C' is the speed of light in air and v is the speed of light in the medium, then the refractive index of the medium is given by `"Refractive Index"(eta_(m))=("Speed of light in air")/("Speed of light in the medium")=(c)/(v)` |
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| 4770. |
The dimensional formula for ω in the relation y = A Sin ωt is |
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Answer» `[M° L° T]` so DIMENSION of `ω=(1)/(t)=[M^(@)L^(@)T^(-1)]` |
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| 4772. |
In aboveexperimentthe temperatureoffreezingmixtureis ______ ""^(@) C. |
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Answer» 0 to4 |
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| 4773. |
a) State the nmodern periodic law. (b) How does the electronie configuration of atom of an element relate to its position in the modren periodic table? Explain with one example. |
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Answer» Solution :"Properties of clements are the periodic fiunction of their atomic number The position of elements depend upon number of valence electrons which depend upon clectronic configuration those clements wich have same valenee elcctrons occupy same group. Those elements which have one vaience electrons belong to group I elements, which have two valence CLECTRONS belong to group 2. Period numbers is cqual to the number of SHELL. Example atonic number of SODIUM (Na) is 1, so electronic conf+guration will be 2.8,1. Sodium has one valence ELECTRON in vaience shell so it belong to group1 as sodium has three shells, so it belong to 3rd period. |
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| 4774. |
The descriptions of five kinds of images are given below : (a) diminished and virtual "" (b) enlarged and real (c) enlarged and erect "" (d) real and inverted (e) virtual and the same size Which one of these describes the image formed : (i) on the retina of the eye ? "" (ii) by a magnifying glass ? (iii) by a convex driving mirror on a car ? "" (iv) by a plane mirror ? (v) on the screen of a slide projector ? |
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| 4775. |
Identify the animal given in the figure and label the figures : |
Answer» SOLUTION :
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| 4776. |
Physical problems arising dur to excessive use of mobile phones. |
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Answer» Solution :(i) VARIOUS physical problems LIKE tiredness, headache, insomnia, forgetfulness, tinnitus, joint pains ans problems in vision may arise due to radiations of cell phones. (ii)These radiations penetrete the BONES of children more effectively than the bones of adults. (iii) Person continuously USING the computers and internet becomes solitary. (iv) Chronic effct of such tendency is that they are nto ready to help other in NEED and hence they also do not gethelp when in need. |
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| 4777. |
A studentstudying the force experienced by a current-carrying conductor in a magnetic field recordsthe followingobservations : [i] The force experienced by the conductor increases as current is increased. [ii] The force experienced by the conductor decreases as the strength of the magnetic field is increased. Which of the two observations is correct and why? |
| Answer» SOLUTION :Observation i] CORRECT is because F `PROP`1 . Observation [II] worng because F `prop` B . | |
| 4778. |
Show how would you join three resistors, each of resistance 9 Omega so that the equivalent resistance of the combination is (i) 13.5 Omega (ii) 6 Omega? |
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Answer» SOLUTION :Here RESISTANCE `R_1=R_2=R_3=9 Omega` (i) To obtain an equivalent resistance `R_(EQ)=13.5 Omega` we connect one resistors `R_1` in SERIES to the parallel combination of `R_2 and R_3` are SHOWN in figure (i) Then `R_(eq)=R_1+((R_2R_3)/(R_2+R_3))=9+((9 times 9)/(9+9))` =9+4.5=`13.5 Omega` (ii) To obtain equivalent resistance `R_(eq)=6 Omega` we connect resistor `R_1` in parallel to the series combination of `R_2 and R_3` as shown in figure 12.29 (ii). Then `R_(eq)=(R_1(R_2+R_3))/(R_1+(R_2+R_3))` `=(9(9+9))/(9+(9+9))=(9 times 18)/27=6 Omega` 
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| 4779. |
Solve this equation for beta-decay ""_(27)Co^(60) to Ni + |
| Answer» Solution :`""_(27)Co^(60) to ""_(28)Ni^(60) +""_(-1)e^(0)` | |
| 4780. |
Complete the following table: |
Answer» SOLUTION : 
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| 4781. |
Several electric bulbs designed to be used on a 220V electric supply line are rated 10 W. How many bulbs can be connected in parallel with each other across the two wires of 220V line if the maximum allowable current is 5 A ? |
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Answer» Solution :Here, the voltage rating of each bulb is 220 V and the power rating of each bulb is 10W. So, the resistance of each bulb `R = V^2/rho = (220^2)/10 = (220 xx 220)/10 = 4840 Omega` Now, here, V = 220 V and I = 5 A given. So, the TOTAL resistance of the given circuit is `R_("total") =V/I =220/5 =44 Omega` i.e., When `44 Omega` resistance is connected with 220 V line, 5 A CURRENT would flow through the given circuit. Now, when .n. bulbs each of resistance R, are connected in parallel, their equivalent resistance`R_("total") =R/n` HENCE, `44 =(4840)/n` `:. n= 4840/44 =110` Thus, 110 bulbs each of resistance 4840 `Omega` connected in parallel will result in total resistance of `44Omega` causing a current of 5 A to flow, when connected to the 220 V line. |
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| 4782. |
Physical states of reactants and products are mentioned while writing a chemical equation. |
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Answer» Solution :(1) While writing a chemical EQUATION, gaseous, liquid and SOLID STATES are symbolised as (g), (1) and (s) respectively. (2) This is done to make it more informative and to emphasise that those reactions occur in that manner only under those conditions. Hence, physical states of reactants and products are mentioned while writing a chemical equation. |
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| 4783. |
One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object ? Verify your answer experimentally. Explain your observations. |
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Answer» Solution :When one-HALF of a convex lens is covered with a black paper, this lens produces a complete image of the object. To prove it we perform an experiment as given below : TAKE a convex lens and cover half part of it by using a black paper. Place it vertically in a stand. On one side of it place a burning candle. On opposite side of the lens fix a WHITE screen as shown in Fig. Adjust the position of candle or screen till clear image of burning candle is formed on the screen. We observe that the image is a complete image of the object.  From the EXPERIMENTAL observations, we find that image formation does not depend upon the sizeof a lens. A smaller lens can also form complete image of an object PLACED in front of it. However, brightness of the image decreases when some part of lens is blocked. It is because now lesser number of rays pass through the lens. |
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| 4784. |
What is an electric generator or dynamo ? |
| Answer» SOLUTION :An ELECTRIC generator or dynamo is a device which converts MECHANICAL energy into ELECTRICAL energy. | |
| 4785. |
Light enters of the eye through a thin, transparent membrane known as |
| Answer» SOLUTION :cornea | |
| 4786. |
Which one of the following groups are not analogous organs? |
| Answer» SOLUTION :The analogous organs look similar and perform similar functions but they have different origin and DEVELOPMENTAL PATTERN. Eg: The function of the WINGS of a bat, the wings of a bird and wings of an insect are similar, but their basic structures are different. | |
| 4787. |
Why do we consider tungsten as suitable material for making the filament of a bulb ? |
| Answer» SOLUTION :The FILAMENT of an ELECTRIC bulb is usually made of tungsten because of its higher resistivity value `(5.5 xx 10^(-8) Omega m)` and its high melting point `(3422^@ C)` | |
| 4788. |
In an electrical circuit, the charge flows from ............ to ............ potential |
| Answer» SOLUTION :HIGHER, LOWER | |
| 4789. |
The characteristics of the image of an object formed on the retina by the lens of the eye is : |
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Answer» REAL and INVERTED |
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| 4790. |
The unit of electric potential difference is ………….. . |
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Answer» J |
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| 4791. |
Controlled chain reaction is used in a ________ to produce energy in a sustained and controlled manner. |
| Answer» SOLUTION :NUCLEAR REACTOR | |
| 4792. |
What is colour of the sunlight : (a) scattered by the dust particles in the atmosphere ? (b) scattered by the air molecules in the atmosphere ? |
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| 4793. |
A man made object revolving around the earth in a fixed orbit is called ….? |
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| 4794. |
Four students A, B, C and D selected the following items from the materials available in the science laboratory to perform an experiment to study the refraction of light through a glass slab : (A) convex lens, glass slab, pins, drawing board, white paper, scale (B) glass slab, pins, drawing board, scale, white paper, protractor (C) glass slab, glass prism, candle, screen, pins, scale, drawing board, protractor (D) concave mirror, pins, glass slab, protractor, white paper, drawing board Correct choice of the items required is made by the student : |
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Answer» A |
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| 4795. |
Answer question numbers (a)-(d) on the basis of your understanding of the following paragraph and the related studied concepts : The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with time. The magnetic field may change due to a relative motion between the coil and a magnet placed near to the coil. If the coil is placed near to a current carrying conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor. The direction of the induced current is given by the Fleming's right-hand rule. Name a practical device based on the phenomenon of electromagnetic induction. |
| Answer» Solution :An ac, clectric GENERATOR is a practical DEVICE based on the PHENOMENON of electromagnetic induction. | |
| 4796. |
Answer question numbers (a)-(d) on the basis of your understanding of the following paragraph and the related studied concepts : Oersted demonstrated that an electric current flowing through a conductor produces a magnetic field. The field so produced exerts a force on a magnet placed in the vicinity of the conductor. Ampere suggested that the magnet must also exert an equal and opposite force on the current carrying conductor. The direction of the force on the conductor depends upon the direction of current as well as the direction of magnetic field. Force acting on the conductor is found maximum when the direction of current is at right angles to the direction of the the magnetic field. In such a condition we can use a simple rule to find the direction of the force on the conductor Electric motor, electric generator, microphone, loudspeaker and measuring instruments etc. make use of current carryingconductors and magnetic fields. How can you demonstrate that an electric current flowing through a conductor produces a magnetic field around it? |
| Answer» SOLUTION :A magnetic COMPASS NEEDLE placed in the neighbourhood of CURRENT carrying conductor gets deflected from its north-south direction. | |
| 4797. |
Answer question numbers (a)-(d) on the basis of your understanding of the following paragraph and the related studied concepts : The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with time. The magnetic field may change due to a relative motion between the coil and a magnet placed near to the coil. If the coil is placed near to a current carrying conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor. The direction of the induced current is given by the Fleming's right-hand rule. What is the cause of current induced in a coil in electromagnetic induction phenomenon ? |
| Answer» Solution :CHANGE in MAGNETIC FIELD with time in and around the COIL. | |
| 4798. |
Answer question numbers (a)-(d) on the basis of your understanding of the following paragraph and the related studied concepts : The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with time. The magnetic field may change due to a relative motion between the coil and a magnet placed near to the coil. If the coil is placed near to a current carrying conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor. The direction of the induced current is given by the Fleming's right-hand rule. Name three different methods for causing induced currents. |
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Answer» SOLUTION :(i) RELATIVE motion between the coil and a magnet placed near the coil. (ii) Change in current FLOWING through a current CARRYING conductor placed near the coil. (III) Relative motion between the coil and a current carrying conductor. |
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| 4799. |
Answer question numbers (a)-(d) on the basis of your understanding of the following paragraph and the related studied concepts : The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with time. The magnetic field may change due to a relative motion between the coil and a magnet placed near to the coil. If the coil is placed near to a current carrying conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor. The direction of the induced current is given by the Fleming's right-hand rule. State Fleming's right-hand rule. |
| Answer» SOLUTION :Fleming.s right-hand RULE states that hold the forefinger, the central finger and the thumb of the right-hand MUTUALLY perpendicular to each other such that the forefinger indicates the direction of magnetic field and the thumb is in the direction of motion of a conductor. Then, the central finger SHOWS the direction of CURRENT induced in the conductor. | |
| 4800. |
The power of lens is + 2D. Find the focal length and state the kind of lens used. |
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Answer» Solution :Solution :P `= 1/f` 2 = `1/f` `f = 1/2 = 1/2 xx 100 CM ` f= 50 cm Type of lens is convex. |
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