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.
| 2851. |
Why are black surfaces, and not the white surfaces, used for making solar cookers ? |
| Answer» Solution :Black surfaces absorb more heat as compared to WHITE surfaces. Therefore, for MAKING solar COOKERS, black surfaces are used. | |
| 2852. |
What type of changes occur in a home having chronically ill oldperson?How will you help to maintain good atmosphere ? |
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Answer» Solution :If there is a chronically ill old persons in the house.the entire atmosphere of the house changes.There is tension and grief in the house .Doctors visits to the house become routine.The ill persons diet and medicines are strictly followed In such times,everybody in the FAMILY should contrbute to the work of taking care of the PATIENT. We can help in BRINGING medicines.We can sit beside the pleasent atmosphere in the house, We should help the persons who is burdened by the duties towards the sick patient by helping in whatever LITTLE ways that we can. |
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| 2853. |
When and where was the first nuclear reactor built ? |
| Answer» SOLUTION :The FIRST NUCLEAR reactor was built in 1942 at Chicago, USA. | |
| 2854. |
The values of mA and muA are |
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Answer» `10^(-6)` A and `10^(-9)`A RESPECTIVELY. |
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| 2855. |
Distinguish between linear and cubical expansion. |
Answer» SOLUTION :
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| 2856. |
State and explain the principle of moments of rotational equilibrium. Define mechanical advantage. |
| Answer» SOLUTION :`sumbar(TAU)`=0. | |
| 2857. |
IT takes 20 s for a person A of mass 50 kg to climb up the stairs. While another person B of same mass does the same in 15 s compare (i) work done (ii) power developedby the person A and B. |
| Answer» SOLUTION :(i)`1:1` (II) `3:4` | |
| 2858. |
Each nuclear fission of uranium nucleus releases .............. neutrons. |
| Answer» SOLUTION :three | |
| 2859. |
On the basis of electronic configuration of 3X, the group number and period of the element 'X' is : |
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Answer» Group 15 PERIOD 2 |
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| 2860. |
In a substance, the direction of conventional current is opposite to the direction of ......... current. |
| Answer» SOLUTION :ELECTRON | |
| 2861. |
Explain the importance of exercise,yoga and maditation, |
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Answer» Solution :Exercise ,yoga and MEDITATION are the ways to reduce MENTAL and physical stress (2) In yoga VARIOUS asanas and pranayama are performed.It also includes good food and discipline of the body and mind (3) Deep breathing ,yogic sleep can help in the building up HEALTH (4) Meditation helps in concentreation and BRINGS positivity to the mind,Especially ,the students increase the concentration in the studies. |
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| 2862. |
Astigmatism is corrected using |
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Answer» convex |
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| 2863. |
ANDROECIUM |
| Answer» Solution :PRODUCTION of pollen grains, the male GAMETES of FLOWER. | |
| 2864. |
What do you understand by the term inexhaustible natural resources ? |
| Answer» SOLUTION :The RESOURCES which are not LIKELY to be EXHAUSTIBLE by man.s CONSUMPTION. | |
| 2865. |
Nowadays, everyone has to face to ……….due to ever increasing disorder, crime and violence. |
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Answer» |
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| 2866. |
(a) What do you mean by refractive index of one medium with respect to another ? (b) The absolute refractive refractive indices of benzene and kerosene are 1.50 and 1.44 respectively. What is the refractive index of benzene with respect to kerosene ? |
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Answer» Solution :(a) N/A (B) Here, refractive index of benzene `n_(b) = 1.50` and refractive index of kerosene `n_(K) = 1.44`. `THEREFORE` Refractive index of benzene w.r.t. kerosene `n_(BK) = (n_(b))/(n_(k)) = (1.50)/(1.44) = 1.04` |
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| 2867. |
On what basis would you classify energy sources as (a) renewable and non-renewable? exhaustible and inexhaustible? are the options given in (a) and (b) the same ? |
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Answer» Solution :(a) The energy source that replenishes in nature is known as a RENEWABLE energy source. SUN, wind, biomass, etc., are some EXAMPLES of renewable enerEy sources. (b)EXHAUSTIBLE sources are those energy sources which deplete and exhaust after a few hundred years. Coal, petroleum, etc. are the exhaustible energy sources. Inexhaustible energy sources shall not exhaust in future, theses are unlimited. Biomass is one of the inexhaustible energy sources. |
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| 2868. |
A convex lens has a focal length of 30 cm. An object is kept in front of it at a distance of 90 cm. Find the distance of the image from the lens. What type of image is formed? |
| Answer» SOLUTION :v=45 CM (REAL, INVERTED) | |
| 2869. |
In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased: (ii) a stronger horse-shoe magnet is used, and (ii) length of the rod AB is increased ? |
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Answer» SOLUTION :(i) DISPLACEMENT INCREASES. (II) Displacement increases. (III) Displacement increases. |
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| 2870. |
Stem cells are |
| Answer» Solution :The special cells having PLURIPOTENCY and ability to divide and differentiate into NEW cells are called STEM cells. | |
| 2871. |
Whatis thecolourof a solutionformedom dippinga pieceof zincin dilute ________ sulphuricacid ? |
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Answer» Colourless |
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| 2872. |
What does the closeness of field lines in a magnetic field signify? |
| Answer» Solution :The DEGREE of closeness of the field lines in a magnetic field INDICATES the STRENGTH of magnetic field in the region. | |
| 2873. |
State whether the following statement are true or false? (i) The position of the centre of gravity of a body remains unchanged even when the body is deformed (ii) The centre of gravity of a freely suspended body always lies vertically below the point of suspension. |
| Answer» SOLUTION :(i) FALSE (II) TRUE | |
| 2874. |
An electric geyser consumes electricity at the rate of 1000 W. If l the potential difference through the 1 electric circuit is 250 V, find the resistance offered by geyser and electric current through the circuit. |
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Answer» Solution :Given:Power input (P) = 1000 W, Potential difference (V) = 250 V To find : Electric CURRENT (I) and Resistance (R) Formula : P = VI and V = IR Solution :We know that powerP=VI `therefore` 1000 W = 250 V x I `therefore I="1000 V"/"250 V"=4 A` We know, resistance R = V /I `therefore R="250 V"/"4A"=62.5 Omega` |
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| 2875. |
Electromagnetic induction was discovered by …………….. . |
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Answer» Edison |
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| 2876. |
Assertion (A) : Large sized concave mirrors are used to concentrate thermal radiation in solar furnaces. Reason (R) : A convex mirror is fitted in automobiles so as to increase the field of view of the vehicle driver. |
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Answer» Both (A) and (R) are TRUE and (R) is CORRECT EXPLANATION of the assertion. |
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| 2877. |
Compare and contrast biomass and hydroelectricity as energy sources. |
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Answer» Solution :BIOMASS and hydroelectricityY are RENEWABLE energy sources. Biomass is derived frorm dead PLANTS and animal wastes. Hence, it is naturally replenished. It is the result of natural PROCESSES. Wood, gobar GAS, etc., are some examples of biomass. Hydroelectricity, In contrast, is obtained from energy stored in water at a height. Energy from it can be produced again and again. lt is harnessed from water and used for mechanical processes. |
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| 2878. |
One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in (figure). The change in internal energy of the gas during the transition is (gamma=3//5) |
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Answer» `-20 KJ` `DELTAU = nC_v DELTAT and T = (PV)/(NR)` `DeltaT = T_2 -T_1 = (P_2V_2-P_1V_1)/(nR) , C_v =R/(gamma-1)` `DeltaU = (nR)/(gamma-1)((P_2V_2-P_1V_1)/(nR))=(P_2V_2-P_1V_1)/(gamma-1)` `= (5xx4-2xx6)/(3/5-1) = (20-12)/(-2//5)=(-8)/(2//5)- 20 KJ` |
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| 2879. |
Assertion: Gas is highly compressible than solid and liquid. Reason: Interatomic or intermolecular distance in the gas is comparably high. |
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Answer» both the assertion and the reason are TRUEAND the reason is the correct explanation of the assertion. |
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| 2880. |
According to a go,vernment letter, it is not necessary to take the oath of freedom from tobacco in every school. |
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Answer» Solution :FALSE. According to a GOVERNMENT LETTER, the OATH of freedom for tobacco is taken in EVERY school. |
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| 2881. |
"Stars appear higher than they actually are". Give reason. |
| Answer» Solution :No. As the light from a STAR passes through the earth.s atmosphere, it UNDERGOES multiple refractions due to changes in refractive index in different REGIONS of the atmosphere. Thus atmosphere REFRACTION tends to bend starlight towards the normal and hence, the star appears slightly higher than its actual position as shown. | |
| 2882. |
Student obtaina clearimageof windowbarson ascreen withthe helpof a convex lens.Butin orderto havethebestimage, histeacher .histeacher suggestedhimto obtain the imageof adistanttree, wherewill thelenshasto bemovedin orderto obtaina clear image? |
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Answer» Away FROMTHE SCREEN |
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| 2883. |
An imaginary line passing through centres of curvature of two surfaces of a lens |
| Answer» SOLUTION :PRINCIPAL AXIS | |
| 2884. |
In our country, there are attempts to increase the height of several existing dams like Tehri and Almati, dams across Narmada. Choose the correct statements among the following that are a consequence of raising the height of dams (i) Terrestrial flora and fauna of the area is destroyed completely. (ii) Dislocation of people and domestic animals living in the area. (iii) Valuable agricultural land may be permanently lost. (iv) It will generate permanent employment for people. |
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Answer» (i) and (ii) (i) Terrestrial flora and funna of area is destrolyes completely. It leads to deforestation and loss of biological diversity. (ii) Dislocation of people and DOMESTIC animals living in an area CAUSES various social problems. (iii) Valuable agricultural land may be permanently lost. (iv) The people are not even given adequate compensation for their LOSSES. (v) This leads to economic problems. (vi) It generates TEMPORARY employment for people. |
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| 2885. |
Name two energy sources that you would consider to be renewable. Give reasons for your choices. |
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Answer» SOLUTION :(i) Wind ENERGY (II) Solar energy These sources of energy can be used again and again , endlessly. They will never GET exhausted. |
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| 2886. |
How high must a body be lifted to gain an amount of P.E. equal to the K.E. it has when moving at speed 20ms^(-1). (The value of acceleration due to gravit at a place is 9.8ms^(-2)) |
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Answer» SOLUTION :`mgh=1/2 MV^(2)` so `h=20.4m` |
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| 2887. |
When sound travels from air to water, which parameter does not change? |
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Answer» Wavelength |
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| 2889. |
A spring of force constnat 800 N^(m-1) has an extension of 5cm. The work done in extending it form 5 cm to 15 cm is |
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Answer» 16 J |
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| 2890. |
A current - carrying conducing wire kept in a magneticfieldshould experiencea force . This was suggested by ……. . |
| Answer» SOLUTION :Ampere | |
| 2891. |
Eye lens is ___________ in nature. |
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Answer» CONVEX |
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| 2892. |
In an experiment to trace the path of a ray of light passing through a rectangular glass slab, angle of incidence in air was given as 60^(@) . Two students P and Q found angle of refraction as 42^(@) and 65^(@) respectively. Who is right and why? |
| Answer» Solution :When a ray of LIGHT goes from air to glass, it bends TOWARDS the normal. So, the angle of REFRACTION must be less than angle of incidence. The STUDENT P is RIGHT. | |
| 2893. |
Label the diagram below . Which phase of cell division is seen in the above diagram ? |
Answer» SOLUTION :The FIGURE SHOWS TELOPHASE - II of Meiosis-II . 
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| 2894. |
A student was given the following suggestions by his classmates for performing the experiment on finding the focal length of a convex lens : (A) Select any object very far away from the laboratory window (B) Select a well illuminated object far (but not very far) from the laboratory window (C) Keep all the lights of the laboratory on (D) Place the lens between the object and the screen (E) Place the screen between the object and the lens (F) Obtain the sharpest image of the object on the screen He can perform the experiment better by following the suggestions : |
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Answer» A, D, F |
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| 2895. |
Draw the diagram o l arrangement ofapparatus ued to show the reaction of zinc granules with dilute sulphurie acid and testing hydrogen gas by burning. Lable the following parts. i) Soap solution.Ii) Delivery tube. |
Answer» SOLUTION :
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| 2896. |
How do detergents cause water pollution? |
| Answer» Solution :Some DETERGENTS having a branched hydrocarbon chain are not biodegrabable by micro ORGANISMS present in water . So, they CAUSE water POLLUTION. | |
| 2897. |
9:3:3:1 ratio is due to_____ |
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Answer» Segregation |
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| 2898. |
What is a solenoid ? Draw the pattern of magnetic field lines of (i) a current-carrying solenoid, and (ii) a bar magnet. List two distinguishing features between the two fields. |
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Answer» Solution :For solenoid and field pattern of a current-carrying solenoid, see Short Answer Question Number 12 and Fig. 13.21. For MAGNETIC field lines of a BAR magnet, see Fig. 13.3. Two distinguishing features between the field due to a solenoid and field due to bar magnet are as follows: 1. The strength of magnetic field of a solenoid can be changed by CHANGING the current FLOWING through the solenoid. HOWEVER, strength of magnetic field of a bar magnet cannot be changed. 2. The direction of magnetic field in a solenoid may be reversed by reversing the direction of current flowing but magnetic field of a bar magnet cannot be reversed. |
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| 2899. |
What do we learn from the story of Jadav Molari Payeng ? |
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Answer» Solution :Mr. Molai single handedly transformed a barren land into forest. ii. It was due to his positive attitude, affection towards nature and hard work, that he could achive success in planting trees,in over 1360 acres of land. iii. From the story of Jadav Molari Payeng we learn that, we all NEED tomake Earth a better place to live for us as well as for the coming generations. iv. From his story, it is CLEAR that if a large crowd causes HARM to the environment, even a single person, if determined can establish a forest and benefit the environment in great ways. v. ALSO, if one person can make a such an impact, many people coming together in unity to take efforts for environment conservation can bring about a REVOLUTION. |
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| 2900. |
Which of the following laboratory apparatus is used during the verification of Ohm's law ? |
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Answer» Voltmeter |
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