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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.
| 4801. |
Special type of material solar cells are made up of |
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| 4802. |
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. An electric motor and a generator both make use of current carrying conductors and magnetic fields, then what is the difference between the two. Give any one point. |
| Answer» Solution :An ELECTRIC motor CONVERTS ELECTRICAL energy into mechanical energy but an electric generator does the REVERSE. | |
| 4803. |
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. What happens to the direction of force experienced by a current carrying conductor placedin a magnetic field if direction of current flow is reversed ? |
| Answer» SOLUTION :DIRECTION of FORCE GETS REVERSED. | |
| 4804. |
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. Name the rule to find the direction of the force acting on a current carrying conductor placed at light angles to a magnetic field. |
| Answer» SOLUTION :Fleming.s LEFT HAND RULE. | |
| 4805. |
Parapodia : Annelida : : Tube feet : …………….. |
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| 4806. |
In beta decay.................... |
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Answer» MASS NUMBER decreases by ONE |
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| 4807. |
The high density of the nucleus suggests |
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Answer» COMPACTNESS of the NUCLEUS |
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| 4808. |
In electroplatting , a metal is coated with another metal using of alloying . |
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| 4809. |
Name the type of energy (kinetic energy K or potential energy U) possessed in the following cases : (a) A moving cricket ball (b) A compressed spring (c) A moving bus (d) A stretched wire (e) An arrow shot out of a bow (f) A piece of stone placed on the roof. |
| Answer» Solution :(a) K (b) U (C) K (d) U (E) K (F) U | |
| 4810. |
Derive the relation 1/R=1/R_1+1/R_2+1/R_3 when resistors are joined in parallel. |
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Answer» Solution :In parallel combination of THREE resistances `R_1,R_2 and R_3` the current in each of the resistances is different. IF l is the current drawn from the CELL then it is divided into branches `I_1,I_2 and I_3` Thus, `I=I_1+I_2+I_3` The potential difference ACROSS each of these resistances is the same. Thus, from Ohm law `I_1=V/R_1,I_2=V/R_2,I_3=V/R_3` IF R is the EQUIVALENT resistance then, `I=V/R` `therefore V/R=V/R_1+V/R_2+V/R_3` and `1/R=1/R_1+1/R_2+1/R_3` 
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| 4811. |
How can a plane mirror, concave mirror, and/or convex mirror be used to produce an image that has the same size as the object ? |
| Answer» Solution :Plane MIRRORS will ALWAYS do this. Concave mirrors will do this when the object is at C or when the object is right on the mirror SURFACE. CONVEX mirrors will only do this when the object is right on the mirror surface. | |
| 4812. |
The resistance of a resistor is kept constant and the potential difference across its two ends is decreased to half of its former value. State the change that will occur in the current flowing through it. |
| Answer» Solution :The CURRENT flowing through the conductor is REDUCED to ONE half of its previous VALUE. | |
| 4813. |
What are fossils ?(b) Describe two methods of determining the age of fossils. |
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Answer» Solution : PRESERVED traces of living organisms are called fossils. Fossils FOUND closer to the surface of EARTH are more recent in origin than the fossils we find in DEEPER layers. Fossils also help us to find evolutionary relation between organisms. (b) Age of the fossil can be estimated by: (i) Digging the layers of the earth - deeper the fossil, older it is and nearer the surface would be more recent ones. (ii) Studying the AMOUNT of `C_(14)` (radioactive isotope of C) in the fossils. Since it has half life, therefore by quantitative analysis we can give approximate time period when that organism would have existed. |
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| 4814. |
What are bifocal lenses ? Who needs to use them ? |
| Answer» Solution :Bifocal lenses are eyeglasses made of two distinct lenses-an UPPER convex LENS and a POWER concave lens- attached suitably. It is used by people suffering from a visual defect where they cannot see nearby and distant OBJECTS clearly. The concave lens is used for to aid distant vision while convex lens helps VIEWING nearby objects clearly. | |
| 4815. |
Real image of an object, formed by a mirror or a lens, is always an __________ image. |
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| 4817. |
Why are we looking at alternate source of energy. |
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Answer» Solution :If we continue to use non-renewable source ofenergy at present rate, these sources will soon EXTINGUISH. This is the REASON why we should CONSERVE these sources and LOOK for their alternatives. |
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| 4818. |
Graphof timeagainsttemperaturefor Hope's Apparatus. |
Answer» SOLUTION :
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| 4819. |
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24Omega resistance, which may be used separately, in series or in parallel. What are the currents in the three cases? |
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Answer» SOLUTION :CASE [i] `R=24+24=48Omega` `I=V/R=220/48=4.6A` Case [II] `1/R=1/24+1/24=2/24=1/12` `R=12Omega` THEREFORE `I=220/12=18.3A`. Case [III] `I=V/R=220/24=9.2A`. |
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| 4820. |
What causes the wind to blow ? |
| Answer» Solution :The Sun rays fall on the equatorial REGION more intensively than on any other part of the Earth. Thus, the hot air of equatorial region , being lighterrises upwards and COOLER air from POLAR region STARTS blowing towards the equator to fill the space vacated by hot air.This moving air is called wind. Therefore, Sun.s energy CAUSES winds on the Earth. | |
| 4821. |
What is meant by scattering of light? The sky appears blue and the sun appears reddish at sunrise and sunset. Explain these phenomena with reason. |
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Answer» Solution :(i) Scattering of LIGHT: Phenomenon of SPREADING of light (DIFFUSED reflection) by minute particles in a medium. (ii) The sky appears blue because the blue colour of SUNLIGHT scatters much more strongly than the red colour by particles in atmosphere/ air due to its shorter wavelength. (iii) At sun-rise and sun-set most of the blue light and shorter wavelengths are scattered away by the particles in the atmosphere as the light from the sun near the horizon passes through thick layers of air and larger distance. The light that reaches us is of LONGER wavelength (red colour) giving a reddish appearance. |
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| 4822. |
Explain briefly two different ways to induce current in a coll. State the rule which determines the direction of induced current. |
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Answer» Solution :Two ways to INDUCE current in a COIL : (ii) If a coil is MOVED in a magnetic field. (iii) By bringing a bar magnet close to the coil or taking away from it. (iii) By rotating the coil in a UNIFORM magnetic field. Fleming.s RIGHT Hand Rule. Refer to Topic-I LATQ-l Q.9 |
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| 4823. |
A man standing under a street lamp of height 'H' above the ground starts running with a constant speed 'v' in a constant direction. The light from the lamp falling on the man forms a shadow of him. Find the velocity with which the edge of the shadow of the man's head moves over the ground if his height is "h". |
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Answer» Solution :Here we need to compare the motions of the man and the edge of the shadow of the man's head. To solve this problem, a common starting point is NECESSARY. Let this point be 'O' which is taken exactly under the lamp as shown in the FIGURE. Let 's' and 'S' be the DISTANCE covered in a time interval 't' from the point 'O' by the man and the edge of the shadow of the man's head respectively. As shown in figure we get two similar TRIANGLES namely `DeltaABDandDeltaACO`. From these two similar triangles we get, `(DB)/(AD)=(OC)/(AO),s/(H-h)=S/H` But we know, s = VT `(vt)/(H-h)=S/H` We know that S/t is the speed of the shadow of the man's head, Thus, `V=(Hv)/(H-h)` 
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| 4824. |
Name the SI unit of magnetic field and define it. |
| Answer» Solution :The SI unit of magnetic FIELD is TESLA [T] . One Tesla [1 T] is the magnetic field strength generating one newton [1N] of force per one ampere [1 A] of current per one metre [1 m] of conductor. 1 T =`N A^(-1) m^(-1)` | |
| 4825. |
Arrange alpha, beta, gamma rays in the increasing order of their ionizing power. |
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Answer» `ALPHA, BETA, GAMMA` |
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| 4826. |
What is the function of the iris and the muscles connected to the lens in the human eye ? |
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Answer» Solution :i. Function of IRIS: Iris controls the amount of light entering the eye by contracting and widening the PUPIL. II. Function of the muscles: The muscles HOLD the LENS such that they can provide fine adjustment of focal length of eye lens by contracting and relaxing. |
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| 4827. |
Name the factors on which degrees of freedom of a gas molecule depend. |
| Answer» SOLUTION :ATOMICITY and TEMPERATURE | |
| 4828. |
Between Annelida and Arthropoda : Peripatus : ….. : Lungfish |
| Answer» SOLUTION :Pisces/Fish and AMPHIBIA | |
| 4829. |
For an eye, the defective near point is 150 cm. Calculate power of correcting convex lens to correct this vision defect. |
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Answer» Solution :The FOLLOWING values are GIVEN Hypermetropic Near point=150cm THEREFORE image distance=v=-150 Object distance=normal near point=-25 (1/v)+(1/u)=1/f (1/v)+(1/25)=1/f (1/-150)+(1/u)=1/f f=150/5cm=0.3 Power=1/f=3.3D (dioptre) It means convex lens of power 3.3 DIOPTRES is required to correcct the VISION. |
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| 4830. |
A circular disc of radius R is removed from a bigger circular disc of radius 2R, such that the circumference of the disc coincides. The centre of mass of the new disc is αR from the centre of bigger disc. The value of alpha is |
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Answer» `1/3` Mass of disc removed, `m_(1) = m/4` Mass of remaining disc `=(3m)/4` Mass `m_(1)` and `m_(2)` are concentrated at `O_(1)` and `O_(2)` respectively and O is their centre of mass. Moment of `m_(1)` about O = moment of `m_(2)` about O. `m/4 xx R = (3m)/R xx ALPHA R RARR alpha =1/3` |
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| 4831. |
Draw the ray diagrams for the following positions of objects in front of a convex lens mention the characteristics of the image Object is placed between focal point and optic center? |
Answer» Solution :If we PLACE an OBJECT between FOCUS and optic centre, we will GET in image which is virtual, ERECT and magnified. 
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| 4832. |
Draw the ray diagrams for the following positions of objects in front of a convex lens mention the characteristics of the image Object is placed beyond 2F_2. |
Answer» SOLUTION :1) REAL 2) INVERTED 3) DIMINISHED. 
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| 4833. |
An elevator which can carry a maximum load of 1800 kg (elevator + passenger) is moving up with a constant speed of 2ms^(-1). The frictional force opposing the motion is 4000 N. Determine the minimum power delivered by the motor to the elevator in watts as well as in horse power. |
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Answer» SOLUTION :Downward FORCE on the ELEVATOR is : `F=mg+f=22000N` `:.` Power SUPPLIED by motor to balance this force is: `P=Fv=44000W` `=74000/746=59`hp |
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| 4834. |
Complete the following chart and state which process of energy production it represents : |
Answer» Solution : The CHART shows PROCESS of ENERGY production through aerobic respiration USING CARBOHYDRATES , proteins and fats. |
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| 4835. |
Name a cyclic unsaturated carbon compound. |
Answer» SOLUTION : CYCLOBUTENE. |
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| 4836. |
5 V electric potential difference is applied between two ends of a conducting wire. If 600C of electric charge passes through it in 10minutes, calculate the resistance of the wire. |
| Answer» SOLUTION :`5 OMEGA` | |
| 4837. |
Biodiversity hotspots are geographical areas with high species diversity which need maximum protection. Thereare "_________" such biodiversityhotspots present all over the world, "_________" spreading over the states of Gujarat, Maharastra, Goa,Tamil Nadu and Kerala is one of thebiodiversity hotspots in India."__________"sanctuary in Assam in under threat due to indiscirminate use of water. "__________" and "__________" are endangered species in this region. "____________"sanctuary of West Bengal is reserved for tigers. |
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| 4838. |
Mrs. Sharma has gone to the jewellers shop to buy gold jewellery. She asks the jeweller, if the jewellery is made of pure gold. The jeweller assure her that it is 100% gold and nothing has been mixed in it. Mrs. Sharma is happy and buys the necklace. Answer the following questions based on the above situation: (i) Was the jeweller right in saying that the necklace is made of 100% gold? (ii) What values are promoted by the jeweller? (iii) What precautions should you take, while purchasing gold jewellery? (iv) Why does Government insist on purchasing Hallmarked jewellery? |
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Answer» Solution :(i) No, he was wrong. Pure gold is very soft and is, therefore, not suitable for making jewellery. It is alloyed with either silver or COPPER to make it hard. But, sometimes jewellers mix a large QUANTITY of copper and silver in gold, to earn more profit. (ii) Untrustworthiness, cheating, cunning. (iii) We should ALWAYS purchase the gold jewellery from a branded shop with proper RECEIPT and Hallmark certificate. (IV) Government insists on purchasing hallmarked jewellery as it contains the gold and its alloyed metal (i.e., copper or silver) in a fixed ratio. |
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| 4839. |
Speed of light in diamond is ___________ because its refractive index is ___________ in nature. |
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| 4841. |
What is respiratory quotient? |
Answer» Solution :(a)  (b) The RATIO of volume of CARBON DIOXIDE liberated and the volume of oxygen consumed, during respiration is called Respiratory quotient (R.Q) `R.Q.=("Volume of "CO_(2)" liberated")/("Volume of "O_(2)" consumed")` |
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| 4842. |
Which nerves carry electrical signals from the light-sensitive cells of retina to the brain ? |
| Answer» SOLUTION :OPTICS NERVES. | |
| 4843. |
How many surfaces does a glass prism have ? |
| Answer» Solution :A GLASS PRISM has five surfaces, THREE are rectangular and two are TRIANGULAR. | |
| 4844. |
The lowest temperature attainable according to Charle's law is......... |
| Answer» SOLUTION :`-273^(@)C` | |
| 4846. |
Apparent weightof a person is always equal to his actual weight |
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| 4847. |
Zinc sulphate heptahydrate is also called as…………………… |
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Answer» BLUE VITRIOL |
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| 4848. |
What is the unit vector perpendicular to the plane of vectors vecA and vecB? If vecA=hati+2hatj-hatk and vecB=2hati+hatk, find a unit vector perpendicular to plane of vecA and vecB. |
| Answer» SOLUTION :`HATN=(vecAxxvecB)/(|vecA XX vecB|), hatn=(2hati-3hatj-4hatk)/(SQRT(29))` | |
| 4849. |
Give reasons : The sky appears dark in space. |
| Answer» SOLUTION :Sky appears DARK in space because there is no ATMOSPHERE PRESENT there and hence SCATTERING of light is not possible. | |
| 4850. |
A cell is that device which gives voltage but cannot berecharged but a battery can be recharged again and again. |
| Answer» SOLUTION :FALSE- Battery is a combinations of TWO or more cells. A primary cell cannot be recharged again but a SECONDARY cell can be recharged again and again. | |