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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.
| 851. |
i] Heating elements of electrical heating devices is made up of an alloy rather than a pure metal. Give two reasons. ii] Four resistors of 2Omega each are joined end to end to form a square. Calculate the equivalent resistance of the combination between two adjacent corners? |
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Answer» SOLUTION :i] Heating elements of electrical heating devices are made up of an alloy rather than a pure metal because a] The resistivity of an alloy is more than the resistivity of a pure metal. b] Alloy does not burn [or oxidize] easily even at higher temperature. II]  Resistors, `R_(1),R_(2)andR_(3)` are in series, THEREFORE their equivalent resistance is `R_(s)=R_(1)+R_(2)+R_(3)=2+2+2=6`ohm Now, `R_(s)andR_(4)` are in parallel, therefore equivalent resistance of the combination between two ADJACENT corners A and D is `1/R_(p)=1/R_(s)+1/R_(4)=1/6+1/2=2/3` Therefore, `R_(p)=1.5` ohm |
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| 852. |
Whose argument is correct ? |
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Answer» Solution :Raheem's argument is correct, in VIEW of WORK DONE. SECOND LABOURER's argument is correct in view of working hours. |
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| 853. |
The huaman eye is very similar to a photographic camera. The figure given shows the main parts of a photographic camera. Now answer the following question : A rarr Aperture, B rarr Lens, C rarr photographic film. a. Name the parts of the human eye similar to the following parts of the photographic camera : (i) Photographic film (ii) Aperture. |
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Answer» Solution :(i) The retina in the human eye is similar to the PHOTOGRAPHIC FILM in the camera. (ii) The PUPIL in the human eye is similar to the APERTURE in a camera. 
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| 854. |
Explain the refraction of light through a glass prism. |
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Answer» Solution :(i) When a beam of white light or composite light is refracted through any transparent media such as glass or water, it is split into its component colours. This phenomenon is called as 'dispersion of light'. (ii) The band of colours is termed as spectrum. This spectrum consists of following colours: Violet , Indigo, Blue , Green , Yellow, ORANGE , and Red. These colours are represented by the acronym "VIBGYOR". (iii) When white light is refracted by a transparent medium, different angles. That is the angle of refraction is different for different colours. (IV) Angle of refraction is the smallest for red and the highest for violet. (v) From Snell's law, we know that the angle of refraction is DETERMINED in term of the REFRACTIVE index of the medium. (vi) hence, the refractive index of the medium is different for different coloured lights. |
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| 855. |
For a given heat in liquid, the apparent expansion is more than that of real expansion. |
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Answer» Real expansion = Expansion of container + Apparent expansion |
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| 856. |
The mostreactiveelementin thehalogengroupis ___ |
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Answer» Astertine |
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| 857. |
The huaman eye is very similar to a photographic camera. The figure given shows the main parts of a photographic camera. Now answer the following question : A rarr Aperture, B rarr Lens, C rarr photographic film. c. Name the muscle which adjusts the size of the eye lens. |
| Answer» Solution :The CILIARY MUSCLES ADJUST the size (the CURVATURE ) of the EYE lens. | |
| 858. |
In terms of potential difference V, electric current I, permittivity epsilon_0 permeability mu_0 and speed of light c, the dimensionally correct equation (s) is (are) : |
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Answer» `mu_0 I^2 = epsilon_0 V^2` |
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| 859. |
The huaman eye is very similar to a photographic camera. The figure given shows the main parts of a photographic camera. Now answer the following question : A rarr Aperture, B rarr Lens, C rarr photographic film. b. Sate one difference between human eye lens and camera lens. |
| Answer» Solution :In a PHOTOGRAPHIC CAMERA, the focal length of the lens is fixed and the DISTANCE of the IMAGE from the lens changes when the position of the lens is CHANGED. Whereas, in the human eye, the focal length of the eye lens is changed by the ciliary muscles and the distance of the image from the eye lens the is fixed. | |
| 860. |
What are the limitations of enegry that can be obtained from the oceans ? |
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Answer» Solution :The energy from the oceans can be obtained mainly in three forms : Tidal energy, Wave energy and OCEAN thermal energy. Some of the important limitations of these forms of energy are as follows : (i) There are very few places around the world where barrages (or dams) can be built to harness tidal energy. Moreover, the rise and FALL of WATER during high and low TIDES is not enough to generate electricity on a large SCALE. (ii) The wave energy can be harnessed only at those places where the sea-waves are very strong. The efficiency of power plants based on wave energy is very low. Moreover, the power plants built in oceans or at sea-shores have high cost of installation, corrode easily and need a lot of maintenance. (iii) A temperature difference of `20^(@)C` (or more) between the surface water of ocean and deeper water is necessary to harness ocean thermal energy. The efficiency of OTEC powerplants which work by utilising ocean thermal energy, is very low. Moreover, it is very expensive to establish OTEC power plants. |
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| 861. |
A movable pulley is used as: |
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Answer» a force multiplier |
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| 862. |
The huaman eye is very similar to a photographic camera. The figure given shows the main parts of a photographic camera. Now answer the following question : A rarr Aperture, B rarr Lens, C rarr photographic film. d. Which phenomenon of light is responsible for the working of the eye? |
| Answer» SOLUTION :The REFRECTION of LIGHT is responsible for the working of the eye. | |
| 863. |
Identify a property of amorphous silicon in the following. |
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Answer» Does not burn in the air |
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| 864. |
A light ray of yellow colour is incident on an equilateral glass prism at an angle of incidence equal to 48^(@) and suffers minimum deviation by an angle of 36^(@). (i) What will be the angle of emergence ? (ii) If the angle of incidence is changed to (a) 30^(@) (b) 60^(@), state in each case whether the angle of deviatioin will be equal to, less than or more than 36^(@). ? |
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Answer» (II) (a) more than `36^(@)` (B) more than `36^(@)`. |
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| 865. |
When three resistors are connected in parallel then the value of the effective resistance is __________ |
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Answer» `NR` |
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| 866. |
What are the types of inertia ? Give an example for each type. |
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Answer» Solution :(i) Inertia of rest: The RESISTANCE of a body to change its state of rest is called inertia of rest. E.g: When you vigorously shake the branches of a tree, some of the leaves and fruits are detached and they fall down. (ii) Inertia of motion: The resistance of a body to change its state of motion is called inertia of motion. E.g: An athlete runs some distance before jumping. Because, this will help him jump longer and higher. (iii) Inertia of direction: The resistance of a body to change its state of direction is called inertia of direction. E.g: When you MAKE a sharp turn while driving a CAR, you TEND to LEAN sideways. |
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| 867. |
Explain the structure and functioning of human eye. How are we able to see nearby as well as distant objects? |
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Answer» Solution :The structure and functioning of human eye are as given below Cornea Cornea is transparent. It is responsible for, most of the refraction of light rays towards the retina. Iris Iris is a dark, CIRCULAR muscular diaphragm behind the cornea.It gives the eye its colour. It also CONTROLS the pupil size and thus controls the amount of light entering the eye.  Pupil Pupil is surrounded by the iris. It regulates and controls the amount of light entering the eye. Retina The retina is the innermost layer of the eye. It contains an outer pigmented layer and an inner nervous layer which contains the photo receptors (rods and cones).cone CELLS are coned shaped and rod cells are rod shaped. Optic nerveThe optic nerve connects the eye to the brain. The nerve fibrescarry impulses from the retina to the visual cortex. Eye lens The eye lens is made up of a fibrous, jelly-like material.It is transparent and has biconvex structure. It forms an inverted real image of the object on the retina and also separates the aqueous and the vitreous humours. Vitreous humour Vitreous humour is clear, semi-solid supporting the eye ball. The eye lens forms an inverted real image of the object on the retina which sends image-electric signals to brain via the optic nerves. The brain reconstructerect image of OBJECTS and MAKE us see as they are. For second part. |
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| 868. |
State whether the following statements are true of false : (a) The scattering away of red light makes the sky appear blue during the day time. (b) The scattering away of blue light makes the sun appear red at sunset. |
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| 869. |
How is the presence of an acid tested with a strip of red litmus paper ? |
| Answer» SOLUTION :The presence of an acid is TESTED by first DIPPING the red litmus PAPER into an alkaline solution. It will turn BLUE. Then dipping this blue litmus paper into the acid, it will turn red again. | |
| 870. |
A simple pendulum ,while oscillating ,rises to a maximum vertical height of 5 cm from its rest position when it reaches to its extreme position on one side.If mass of the bob of the simple pendulum is 500 g and g-10 m s^(-2) find : (i)the total energy of simple pendulum at any instant while oscillating ,and (ii)the velocity of bob at its mean position State the assumption made in your calculation . |
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Answer» Solution :Given ,h=5 cm =0.05 m,m =500 g=0.5 kg ,g=10 m `s^(-2)` Assumption Lthere is no loss of energy due to air FRICTION . (i)Total energy of simple pendulum =potential energy at its extreme position =mgh =`0.5xx10xx0.05=0.25 J` (ii)KINETIC energy at the MEAN position or `V=sqrt(2gh)=sqrt(2xx10xx0.05)=sqrt(1)` =`1MS^(-1)` |
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| 871. |
Ria and Rama are students of Class - X. Ria is very much organised and maintained. The teachers love her. She earns a great respect in the class whereas Rama is unorganised and always faces a lot of problems in handling life situations. Answer the following questions based on above information: (i) In your opinion how does organisation help in daily life? (ii) How can you relate the above fact with the chapter-'classification of elements'? (iii) How does classification of elements help us in studying them properly? |
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Answer» SOLUTION :(i) ORGANISATION makes our life simple, EASY and systematic. (ii) As classification and organisation help us in our daily life, in the same WAY classification of elements has make the study of elements easier and simple. (iii) We can know about the properties of elements because of this classification. |
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| 872. |
Where do you observe Pascal's principle in daily life ? Given few examples. |
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Answer» Solution :Pascal's principle is applied in the WORKING of 1. Hydraulic JACKS 2. Hydraulic lifts 3. Hydraulic pumps 4. Hydraulic cranes 5. Siphons 6. Artesian wells 7. WATER TOWERS and dans |
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| 873. |
Tobacco consumption is known to stimulate secretion of adrenaline. The componemt causing this could be |
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Answer» Nicotine |
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| 874. |
What steps would you suggest to help minimise environmental pollution caused by burning of fassil fuels ? |
| Answer» SOLUTION :(i) Use of SMOKELESS APPLIANCES (II) Afforestation | |
| 875. |
Calculate the electrical energy consumed by a 1200 W toaster In 30 minutes. |
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Answer» Solution :P =1200 W t =30 min =0.5 h Electrical ENERGY (E) =`Pxxt` =`1200 xx0.5` `=600W//h =0.6 kWh`. |
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| 876. |
Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split-ring in an electric motor? |
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Answer» Solution :Principle. Electric motor is based upon Fleming.s left hand rule. When a current carrying conductor capable of free movement is placed in a magnetic field, it EXPERIENCES a mechanical force and begins to MOVE in a direction given by Fleming.s left hand rule. Construction. A DC motor consist of a single coil ABCD called armature between the pole pieces of a magnet as shown in fig. Armatureconsists of a coil of a large number of turns of insulated wire WRAPPED on a soft iron core. The two ends of the armature are connected to segments `S_(1)` and `S_(2)` of a commutator. The brushes `B_(1)` and `B_(2)` kee their CONTACT with the commutator as it rotates. Working. A direct current from a battery is passed through armature. The current flows in the coil along ABCD as shown in Fig. The limb AB of the coil experience downwards and CD of the coil experience upward force in accordance with Fleming.s left hand rule.These two equal and opposite forces constitute a couple tending to rotate the coil in clockwise direction. After HALF the rotation, brush `B_(1)` has contact with `S_(2)`  and brush `B_(2)` with `S_(1)`. The direction of the current gets reversed. The current now flows along DCBA instead of along ABCD. Limb DC experiences downward and BA experiences an upward force in accordance with Fleming left hand rule. The process repeats itself and motion of armature becomes continuous after some time. Split rings help in reversing the current in the coil after every half rotation. |
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| 877. |
Problem caused by nitrogen dioxide generated due to buning of like coal diesel petrol etc. |
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Answer» |
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| 878. |
Define the term latent heat of vaporisation. |
| Answer» SOLUTION : The heat ENERGY absorbed at CONSTANT temperature during transformation of liquid into GAS is called the latent heat of VAPORISATION. | |
| 879. |
Name and state the rule to find the direction of : (a) current induced in a coil due to its rotation in a magnetic field. (b) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it. |
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| 880. |
Which of the fourrings has the strongestmagnetic field at its centre if same current flowsthrough them ? |
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Answer»
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| 881. |
Derive Newton's formula for speed of sound in an ideal gas. What is Laplace correction? |
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| 882. |
Where does the latent heat go during these transformations? |
| Answer» Solution :During these transformations, the LATENT HEAT is GIVEN out or RELEASED to the surroundings. | |
| 884. |
Peer-group influence is stronger in cse of ………. |
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| 885. |
(a) Is eye lens made of glass ? (b) Is focal lengths of eye lens fixed ? |
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Answer» Solution :(a) No, eye lens is not made of GLASS. It is made of fibrous jelly like MATERIAL. (b) No, focal length of eye lens is ADJUSTABLE. |
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| 886. |
Hydroelectric energy, solarenergy and wind energyare called non - renewable energies. True/False |
| Answer» Solution :(1) Hydroelectric energy, solarenergy andwindenergyis obtained RESPECTIVELY fromflowing water, solarradiations and flowing wind. (2) These sources, i.e. water RESERVOIRS, sunand the wind are inexhaustible andsustainable, They will not be FINISHED. (3) On the contrary, the conventional energy sources such as coal and fossilfuels have limited reserves. (4)They cannot be renewed and may get exhausted in FUTURE. Hydroelectricenergy, SOLAR energy and wind energy can bereplenished and hence they are called renewable. | |
| 887. |
A car of mass 2000 kg is lifted up a distance of 30 m by a crane is 1 min. A second crane does the same job in 2 min. do the cranes consume the same or different amounts of fuel? What is the power supplied by each crane? Neglect Power dissipation against friction. |
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Answer» Solution :`t_(1)=1` MIN =60s, `t_(2)=` min =120s `W=F_(s)=mgs=5.88xx10^(5)J` As both CRANES same AMOUNT of work so both consume same amount of fuel. `P_(1)=W/(t_(1))` and `P_(1)=W/(t_(2))` `:.P_(1)=9800W ` & `P_(2)=4900W`. |
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| 888. |
The magnification produced by a plane mirror is + 1. What does this mean ? |
| Answer» SOLUTION :The positive sign means image formed by a plane MIRROR is virtual and erect since the MAGNIFICATION is 1. It means that the SIZE of the image is equal to the size of the object. | |
| 889. |
What is a solenoid ? Draw the magnetic lines of force around the current carrying solenoid. Write the use of solenoid. |
Answer» Solution :SOLENOID is a coil of WIRE which produces magnetic field on passing ELECTRIC CURRENT through it. It is used in an electric bell. 
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| 890. |
A book with printing error contains four different formulae for displacement. Choose the correct formula/formulae(a) y = a sin2πt/T (b) y = a sin vt (c) y =a/Tsin(t/a)(d) y =a/T(sin(2π)t/T+cos(2π)t/T) |
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Answer» SOLUTION :The argument of sine and cosine function must be dimensionless so (a) is the probable correct FORMULA. SINCE `y=(a)/(t)sin((t)/(a)),because[(t)/(a)]` is dimensional so this is INCORRECT. |
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| 891. |
A student says "Potential difference and emf are same. Justify your answer. |
| Answer» Solution :Both are DIFFERENT because potential difference is the work done by the electric FORCE on unit positive CHARGE to move it through a distance between two points whereas emf is the CHEMICAL force to move unit positive charge from negative terminal to positive terminal of the battery. | |
| 892. |
What happens to the image distance in the eye when we increase the distance of an object from the eye? |
| Answer» Solution :For a normal eye, IMAGE distance REMAINS FIXED, whatever be the OBJECT distance. | |
| 893. |
Four students A, B, C and D performed an experiment to determine the focal length of a convex lens by using a lighted candle kept at a considerable distance as the object. They represented the position fo image by drawing the following diagrams : Which diagram describes the correct position of image of the candle ? |
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Answer» A |
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| 894. |
In which region has the ancient water harvesting structure 'Kulhs' been established ? |
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Answer» RAJASTHAN |
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| 895. |
State Newton's second law . |
| Answer» Solution :"The force acting on a body is directly PROPORTIONAL to the rate of CHANGE of linear MOMENTUM of the body and the change in momentum TAKES place in the direction of the force ". | |
| 896. |
Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason. |
| Answer» Solution :METALS are good CONDUCTORS because they have a large number of free electrons but GLASS has no free electrons and is a BAD conductor of ELECTRICITY. | |
| 897. |
The negatively charged particle considered as a free particle moving in a metallic conductor. |
| Answer» SOLUTION : ELECTRON | |
| 898. |
Define atomic size. Give its unit of measurement. In the Modern Periodic Table what trend is observed in the atomic radius in a group and a period and why is it so ? |
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Answer» Solution :• Atomic SIZE is defined as the distance between the centre of nucleus and the outermost SHELL of an ISOLATED atom. • Atomic radius increases down the group. This is because new shells are being added. This increases the distance between the nucleus and outermost electrons. • Atomic radius decreases in moving from left to right along a period. This is due to increase in NUCLEAR charge which TENDS to pull the electrons closer to the nucleus and reduces the size of the atom. |
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| 899. |
60 g of steam at temperature100^(@)Ccondenses completely to form water at temperature100^(@)C giving off heat of 32.4 kcal. Find out latent heat of vaporisation of water. |
| Answer» SOLUTION :540 cal/g | |
| 900. |
Figure below shows the displacement-time curve of the particles A and B. Which of the following statements is correct? |
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Answer» both A and B move with uniform equal speed |
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