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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.
| 2751. |
What is 'Chipko Movement'? Why should we conserve forests? |
| Answer» Solution :Chipko movement is a non- political public movement for conservation of natural habitat and wildlife of preventing excessive commercial exploitation of forest chipko means .Hug. and the movement was STARTED by the villagers of Garhwalby hugging TREES. We should conserve forest bacause it helps in protection of land, retaining sub-soil WATER, checking flood and there by MAINTAIN the ecosystem. | |
| 2752. |
Electric charges flows from a ___________ electric potential to a ____________ electric potential. |
| Answer» SOLUTION :HIGHER, LOWER | |
| 2753. |
If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth, is |
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Answer» `(1)/(4)MGR` |
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| 2754. |
An old person is unable to see clearly nearby object as well as distant objects : (i) What defect of vision is he suffering from? (ii) What kind of lens will be required to see clearly the nearby as well as distant objects? Give A reason. |
| Answer» Solution :(i) PRESBYOPIA. (II) He shall have to use bifocal LENS. Convex lens for long sightedness and concave lens for SHORT- sightedness. | |
| 2755. |
List the factors on which scattering of light depends. |
| Answer» SOLUTION :SIZE of scattering particle and the wavelength of LIGHT. | |
| 2756. |
Mention any two important characteristic features of mammals. |
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Answer» SOLUTION :Characteristic FEATURES of MAMMALS: (i) Presence of DIAPHRAGM. (ii) Presence of mammary GLANDS. |
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| 2757. |
The mass of vapour present in a unit volume of air is called ……. |
| Answer» SOLUTION :ABSOLUTE HUMIDITY | |
| 2758. |
Explain the function of fuse in a domestic electric circuit ? An elecdric oven having power rating 2000 W, 220 V is used in an electric circuit, having a fuse of 5A rating. What is likely to happen when the oven is switched on? Explain. |
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Answer» Solution : It prevents the electric circuits and appliances from POSSIBLE damage by stopping the flow of unduly high electric CURRENT. Here, P = 200 W, v = 220 V Using P = VI ` I= (p)/(V) = (220)/(220) = 9.09 ` A. Since the current flowing through the oven is larger than the fuse rating (5A) , the fuse wire meltsand breaks the CIRCUIT, thus protecting the circuit. |
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| 2759. |
On what basis would you classify energy sources ? (i) Renewable and non - renewable (ii) Exhaustible and inexhaustible Are the options given in (i) and (ii) the same ? |
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Answer» Solution :We WOULD classify ENERGY sources as (i) renewable and NON - renewable . Renewable sources of energy are inexhaustible , whereas non - renewable sources of energy are exhaustible . Thus , the options in (i) and (II) are the same. |
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| 2760. |
Try this Material: Convex lens, screen, metre scale, stand for the lens etc. Method: Keeping the screen fixed, obtain a clear image of a distant object like a tree or a building with the help of the lens on the screen. Measure the distance between the screen and the lens with the help of the metre scale. Now tum the other side of the lens towards the screen. Again obtain a clear image of the distant object on the screen by moving the lens forward or backward. Measure the distance between the screen and the lens again. Discuss the relation between this distance and the radius of curvature of the lens with your teacher. |
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Answer» Solution :The FOCAL length and radius of curvature of the lens are related with each other by lens MAKER's equation given by, `(1)/(f)=(n-1)((1)/(R_(1))-(1)/(R_(2)))` Where, n = Refractive index of material of lens, `R_(1) and R_(2)` = Radii of curvature of two surfaces of the lens. |
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| 2761. |
At constant pressure, volume of gas directly proportional to __________. |
| Answer» SOLUTION :TEMPERATURE | |
| 2762. |
What are real and virtual images? How will you find out whether an image is real or virtual? Can a virtual image be obtained on a screen? |
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Answer» SOLUTION :(i) If the reflected or REFRACTED rays from the lens . actually meet at a POINT when light rays from the object are incident on it, then the image formed is Real and it can be SEEN on a screen. If the reflected or refracted rays from the lens appear to meet at a point when light rays from the object are incident on it, then the image formed is called VIRTUAL. (ii)If the images are inverted then they are real and if they are erect then they are virtual. (iii) Virtual images cannot be obtained on a screen. |
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| 2763. |
State the areas where acid rains are most likely. |
| Answer» Solution :ACID RAINS are most LIKELY in industrial areas where there is EMISSION of oxides of nitrogen and sulphur. | |
| 2764. |
You cannot enjoy watching a movie from a very short distance from the screen in a cinema hall Explain the statement. |
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Answer» SOLUTION :1. The intensity of light falling on the eye is greater while watching a MOVIE from a very short distance from the screen in a CINEMA HALL. 2. Therefore, the pupil of the eye contracts to regulate the amount of light entering the eye. 3. This causes strain to theeyes and hence, one cannot enjoy watching a movie from a very short distance. |
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| 2765. |
Why are copper and aluminium wires, usually employed for electricity transmission ? |
| Answer» Solution :They are extremely GOOD CONDUCTORS having a low value of RESISTIVITY. | |
| 2766. |
The process useful to convert solar energy into chemical energy is called |
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Answer» ELECTROLYSIS |
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| 2767. |
Mendeleev's periodic table : Atomic mass :: Modern periodic table : ___________ |
| Answer» SOLUTION :ATOMIC NUMBER | |
| 2768. |
(figure). Shows the P-V diagram of an ideal gas undergoing a change of state from A to B. Four different process I, II, III, IV, as shown in (figure) may lead to the same change of state. |
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Answer» CHANGE in internal ENERGY is same in IV and III cases but not inI and II As work done = area under P-V CURVE THEREFORE, work done is maximum in Case I. |
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| 2769. |
Explain the terms : Overloading and short- circuiting. |
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Answer» Solution :Overloading occurs when or TWO many APPLIANCES of high POWER ratings are connected LO a single electric circuit and switched on simultaneously. As a result, the circuit draws large current beyond its capacity. Short circuiting takes place in domestic power supply if the live WIRE and the neutral wire come into direct contact, due to damage of insulation of live wire. |
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| 2770. |
An electric iron consumes energy at the rate of 420 W when heating is at the maximum rate and 180 W when heating is at the minimum rate. The applied voltage is 220V. What is the current in each case. |
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Answer» Solution :Case : 1 POWER (P) = 420W Applied Voltage (V) = 220V CURRENT I `=(P)/(V)=(420)/(220)=1.9A` Case : 2 Power (P) = 180W Applied Voltage (V) = 2.20V Current I `=(P)/(V)=(180)/(220)=0.8A` |
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| 2771. |
A man who is standing at a distance of 850 m from a sound reflecting surface claps loudly. If the velocity of the sound in air is 340 m^(-1), then the time taken by the echo to reach him is |
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Answer» 5 s |
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| 2772. |
Two satellites A and B are orbiting around the earth in ciruclar orbits of the same radius. The mass of A is 16 times that of B. Then the raito of the period of revolution of B to that of A is |
| Answer» Solution :`T=(2pir)/(V)" and "v= sqrt(Gm)/(r ), T` is INDEPENDENT of mass, `(T_B)/(T_A)= 1 : 1 implies T_(A) = T_(B)`. | |
| 2773. |
Fuse wire, Bad conductor, Rubber gloves, Generator |
| Answer» Solution :Generator. It is a device to produce ELECTRICAL current, whereas REMAINING are USED to block or AVOID electric current | |
| 2774. |
Three resistors are connected in parallel with a 30V battery. A current of 7.5A flows through the circuit. If two out of the three resistors are of 10Omega and 12Omega, determine the resistance of the third resistor. |
| Answer» SOLUTION :`15OMEGA` | |
| 2775. |
Calculate the resistance of a conductor through which a current of 5A passes , when the potential difference between its ends is 60V. |
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Answer» Solution :GIVEN , I = 5A V = 60 V FromOhm.s law : `R = V/I=60/5=12Omega` `:.R = 12 OMEGA` |
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| 2776. |
State Kirchhoff's Junction Law. |
| Answer» Solution :At any JUNCTION POINT in a circuit where the current can divide, the sum of the CURRENTS into the junction MUST equal to the sum of the currents leaving the junction. This means that there is no ACCUMULATION of electric charges at any junction in a circuit. | |
| 2777. |
What is bagasse? |
| Answer» Solution :Bagasse is the remaining PART of the SUGARCANE from which JUICE has been EXTRACTED. | |
| 2778. |
Coefficient of linear expansion depend upon ..... |
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Answer» pressure |
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| 2779. |
Why are black surfaces utilised for making solar cooker and solar water heaters? |
| Answer» Solution :A BLACK surface ABSORBS more heat than a white reflecting surface under IDENTICAL CONDITIONS. | |
| 2780. |
Fill in the following blanks with suitable words :(a) Biomass is another form in which ………. Energy manifests itself.(b) Tidal waves build up and recede ………. a day. |
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| 2781. |
When an electric dipole is held at an angle in a uniform electric field, the net force F and torque tau on the dipole are |
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Answer» `F = 0, TAU = 0` |
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| 2782. |
Explain the meaningof lawof conservation of linear momentum |
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Answer» Solution :(i) There is no change in the linear momentum of a system of bodies as long as no net external force ACTS on them. (ii) Let up prove the law of CONSERVATION of linear momentum with the following illustration:  (iii) Let two bodies A and B having masses `m_1 and m_2` move with initial velocity `u_1 and u_2` in a straight LINE. (iv) Let hte velocity of the first body be higher than that of the second body. i.e., `u_1 > u_2` (v) During an interval of time t second, they tend to have a collision. After the impact, both of them move along the same straight line with a velocity `v_1 and v_2` RESPECTIVELY. Force on body B due to A, `F_B = (m_2[v_2 - u_2])/(t)` Force on body A due to B, `F_A = (m_1[v_1 - u_1])/(t)` By Newton.s III law of motion, Action force = Reaction force `F_A = -F_B` `(m_1[v_1 - u_1])/(t) = -(m_2[v_2 - u_2])/(t)` `m_1v_1 - m_1u_1 = -m_2v_2 + m_2u_2` `m_1v_1 + m_2v_2 = m_1v_1 + m_2 v_2` The above equation confirms in the absence of an external force, hte algebraic sum of the momentum after collision is numerically equal to the algebraic sum of the momentum before colliosion. Hence the low of conservation linear momentum is proved. |
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| 2783. |
What is presbyopia ? Write two causes of this defect. |
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Answer» Solution :Presbyopia is a defect of vision where a person can see distant objects CLEARLY but nearby objects appear blurry. This defect arises in aged persons due to causes. (i) CILIARY muscles gradually become weak, and (ii) eye LENS hardens and its flexibility diminishes with ageing. Because of these reasons, eye loses its power of ACCOMODATION and its near POINT gradually recedes. So, nearby objects cannot be focussed on the eye lens clearly. |
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| 2784. |
What is meant by Rayleigh scattering? |
| Answer» Solution :The scattering of SUNLIGHT by the ATOMS or MOLECULES of the gases in Earth's ATMOSPHERE is KNOWN as Rayleighscattering. | |
| 2785. |
............. in the Chairman of the District disaster management authority. |
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Answer» |
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| 2786. |
How are two resistors with resistances R_1 Omega and R_2 Omega are to be connected to a battery of emf 3 volts to obtain maximum current flowing through it? |
| Answer» SOLUTION :Resistors `R_1 and R_2` should be CONNECTED in parallel so as to GET maximum current. | |
| 2787. |
What is the difference between heat and temperature ? |
Answer» SOLUTION :
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| 2788. |
What is the lowest resistance that can be obtained by combining four coils of resistors of 4 Omega,8 Omega ,12 Omega and 24 Omega? |
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Answer» Solution :To obtain lowest RESISTANCE given COILS MUST be CONNECTED in parallel. Then the equivalent resistance will be `1/R=1/R_1+1/R_2+1/R_3+1/R_4=1/4+1/8+1/12+1/24=(6+3+2+1)/24=12/24=1/2 IMPLIES R=2 Omega` |
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| 2789. |
When a body is immeresed in a fluid, the force of buoyancy is equal to the ……………. |
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Answer» VOLUME of FLUID displaced |
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| 2790. |
Say True or False.At a height of h from the ground, the graitational potential energy is (-GMm)/(R+h) |
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Answer» |
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| 2791. |
What is meant by three types of 'R' (3-R's) to save the environment ? Explain with examples how would you follow the 3- R' s in your school to save the environment. |
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Answer» SOLUTION :The THREE types of .R.are Reduce , Reuse , Recyle . The 3- R .s can be followed in the FOLLOWING ways : - Switch off the fans and bulbs when not in use, - Reuse of paper , POLYTHENE bags , etc., - Reduce the wastage of water/ paper or any other item. |
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| 2792. |
In battery, which one helps to move the ions in a specific direction ? |
| Answer» SOLUTION :`Electrolyt//chemical FORCE.` | |
| 2793. |
" Derive "R=R_(1)+R_(2)+R_(3). |
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Answer» Solution :Series CONNECTION : In series connection of resistors there is only ONE path for the flow of current in the circuit. Hence, the current in the circuit is equal to I. According to Ohm's law, `thereforeV_(1)=IR:V_(2)=IR_(2)andV_(3)=IR_(3).` `rArr` Let R be the EQUIVALENT resistance of the combination of resistors in series. `" Also "V=IR_(eq)` `V=V_(1)+V_(2)+V_(3)` `IR_(eq)=IR_(1)+IR_(2)+IR_(3)` `rArrcancel(I)R_(eq)=cancel(I)(R_(1)+R_(2)+R_(3))` `rArrR_(eq)=R_(1)+R_(2)+R_(3)` `therefore` The sum of individual resistance is equal to their equivalent resistance when the resistors are CONNECTED in series. 
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| 2794. |
................ are the colourless plastids. |
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Answer» chloroplast |
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| 2795. |
Kavitha gave birth to a female baby.Her family members say that she can give birth to only female babies because of her family history .Is the statement given by her family members true.Justify your answer . |
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Answer» Solution :No, the statement is not true. Sex determination is a chance of probability as to which category of sperm fuses with egg. If the egg [X] is fused by the X-bearing sperm, an XX INDIVIDUAL (female) is procduced. If the egg [X] is fused by the Y-bearing sperm an XY individual (male) is PRODUCED. The sperm, produced by the father, DETERMINES the sex of the child. (ii) The Rh factor was discovered by Landsteiner and Wiener in 1940 in Rhesus monkey. Hence the NAME Rh factor. 
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| 2797. |
What is a nuclear reactor ? Explain its essential parts with their functions. |
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Answer» Solution :Nuclear reactor Nuclear reactor is a device in which the nuclear fission REACTION takes place in a self-sustained and controlled manner to produce electricity  Components of a Nuclear Reactor The essential components of a nuclear reactor are(i) fuel, (ii) moderator, (iii) control rod, (iv) coolant and (V) protection wall. (i) Fuel: A fissile material is used as the fuel. The commonly used fuel material is uranium. (ii) Moderator: A moderator is used to SLOW down the high energy neutrons to provide slow neutrons. Graphite and heavy water are the commonly used moderators. (iii) Control rod: Control rods are used to control the NUMBER of neutrons in order to have sustained chain reaction. Mostly boron or cadmium rods are used as control rods. They absorb the neutrons. (iv) Coolant: A coolant is used to remove the heat produced in the reactor core, to produce steam. This steam is used to run a turbine in order to produce electricity. Water, air and helium are some of the coolants. (v) Protection wall: A thick concrete Icad wall is built around the nuclear reactor in order to prevent the harmful RADIATIONS from escaping into the environment, |
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| 2799. |
In order to determine the focal length of a concave mirror, a student obtained the sharp image of a distant tree on a screen. In order to obtain a sharp image of a window grill of the laboratory on the same screen, in which direction should the screen be moved ? |
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Answer» very CLOSE to the mirror |
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| 2800. |
A machine is driven by a 100 kg mass that falls 8m in 4*0s. it lifts a load of mass 500 kg vertically upwards. Taking g=10ms^(-2). Calculate: (a) the force exerted by the falling mass. (b) the work done by the falling mass in its displacement by 8*0m. (c) the power input to the machine. (d) the power output of the machine if its efficiency is 60%, and (e) the work done by the machine is 4*0s. |
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Answer» Solution :Given: `m=100kg,d=8*0m,t=4*0s,L=500kg` (a) Force exerted by the falling mass=mg `=100xx10=1000N` (b) Work done by the falling mass =force exerted by the falling mass`xx`displacement `=mgxxd` `=1000xx8*0=8000J` (c) Power input`=("work done on machine")/("time")` `=(8000J)/(4*0s)=2000W` (d) Given, EFFICIENCY=60%=`0*6` power input=? SINCE efficiency=`("power input")/("power input")` `therefore`Power output=power input`xx`efficiency `=2000Wxx0*6=1200W` (E) Work done by the machine is `4*0`s =power output `xx` time `=1200Wxx4*0s=4800J`. |
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