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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.
| 6851. |
Read the passageand answer the following question. Salaam Mumbai Foundation. This organization runs programs in various schools in Mumbai to emprower the children living in slum area in the field of education, sports, arts and business. jThis organization encourages the children to take education by helping them to improve their health and lifestyle. This trust has made some districts in Maharashtra completely tobacco-free through hard work. Since the year 2002 this organisation is working with various school in urban and rural area for making the society tabaccofree. This programme is being implemented with the help of Government in about 200 schools in Mumbai and 14000 schools in the rest of maharashtra. The oath of freedom from tobacco is taken in every school as per the Government letter. Name the organization given in the passage. |
| Answer» SOLUTION :SALAAM MUMBAI FOUNDATION. | |
| 6852. |
Name some devices in which electric motors are used. |
| Answer» Solution :ELECTRIC MOTORS are used in electric fans, REFRIGERATORS, mixers, WASHING machines, ETC. | |
| 6853. |
Read the passageand answer the following question. Salaam Mumbai Foundation. This organization runs programs in various schools in Mumbai to emprower the children living in slum area in the field of education, sports, arts and business. jThis organization encourages the children to take education by helping them to improve their health and lifestyle. This trust has made some districts in Maharashtra completely tobacco-free through hard work. Since the year 2002 this organisation is working with various school in urban and rural area for making the society tabaccofree. This programme is being implemented with the help of Government in about 200 schools in Mumbai and 14000 schools in the rest of maharashtra. The oath of freedom from tobacco is taken in every school as per the Government letter. How will you contribute towards a tobacco-free society ? |
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Answer» Solution :1. I will explain the harmful effects of tobacco consumption to my FAMILY members, relatives and NEIGHBOURS. 2. I will CONDUCT small AWARENESS probgrammes in my own way like distributing pamplets, conducting talks etc. 3. I will report to my school principal about the students who are indulged in tobacco consumption. 4. I will personally counsel my friend who ar using tabacco products in any form. |
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| 6854. |
A rectangular box lies on a rough inclined surface. The coefficient of friction between the surface and the box is (mu) Let the mass of the box be m. At what angle of inclination theta of the plane to the horizontal will the box just start to slide down the plane ? |
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Answer» `mu= tan theta` `or theta=tan^(-1) mu` |
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| 6855. |
A rectangular box lies on a rough inclined surface. The coefficient of friction between the surface and the box is (mu) Let the mass of the box be m. What is the force acting on the box down the plane, if the angle of inclination of the plane is increased to alpha gt theta. |
Answer» SOLUTION :FORCE ACTING on the BOX down the PLANE 
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| 6856. |
Draw on your answer book and show the path of reflected ray. |
Answer» SOLUTION :The REFLECTED ray appears to pass through focus F of CONVEX mirror 
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| 6857. |
In a thermal power plant, chemical energy in coal is converted to electrical energy |
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| 6858. |
Mention the angle between a current carrying conductor and magnetic field for which the force experienced by this current carrying conductor placed in magnetic field is largest . |
| Answer» SOLUTION :The ANGLE between current carrying conductor and MAGNETIC FIELD is `90^(@)`. | |
| 6860. |
A bulb of 60 W is connected across a source of 240 V. Find the resistance of the bulb. |
| Answer» SOLUTION :`960 OMEGA` | |
| 6861. |
An electric iron consumes energyat a rate of 840 W, when heating is at the maximum rate and 360 W, when heating is atthe minimum. The voltage is 220V. What are the current and the resistance in each case? |
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Answer» Solution :From EQUATION of electric power, we KNOW that the power input is P = VI. Thus, the current `I = P/V` ( a ) When HEATING is at the maximum rate, `I = (840 W)/(220V) = 3.82 A ,` and the resistance of the electric iron is `R =V/I = (220V)/(3.82A)=57.60 Omega.` (b )When heating is at the minimum rate, `I =(360W)/(220V) = 1.64A `, and the resistance of the electric iron is `R = V/I = (220W)/(1.64A) = 134.15 Omega` Note: It is clear that when the heating rate of an electric iron is different, resistance of its heating coil is different eventhough the source VOLTAGE remains the same. |
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| 6862. |
What is the purpose of using shockers in a car ? |
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| 6863. |
List any two limitations in harnessing wind energy. |
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Answer» Solution :(i) WIND energy farms can be established only at those places where wind blows for the MAJOR PART of the YEAR. (ii) ESTABLISHMENT of wind farms requires a large area of land. |
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| 6864. |
A gas is filled in a cylinder fitted with a piston at a definite temperature and pressure. Explain on the basis of kinetic theory why on pulling the piston out, the pressure of decreases. |
| Answer» SOLUTION :When piston is pulled out the VOLUME of the gas increases, Now losses NUMBER of molecules colliding against the wall of container per UNIT area decreases. Hence pressure decreases. | |
| 6865. |
The human eye forms the image of an object at its |
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Answer» cornea |
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| 6867. |
An object is kept at 60 cm in front ofa convex lens. Its real image is formed at 20 cm from the lens . Find the focal length and power of the lens. |
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Answer» Solution :DATA : Convexlens , `u=-60`cm, `v=20` cm, `f=` ? `1/f =1/v -1/u =1/(20 cm) - 1/(-60cm) =(1)/(20 cm) +(1)/(60 cm)` `=(3+1)/(60 cm) +(4)/(60 cm) =(1)/(15 cm)` `therefore f=15 cm` The focal length of the LENS =15 cm. |
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| 6868. |
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is. |
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Answer» CONSTANT and equal to mg in magnitude When he set straight in that case, R=mg |
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| 6869. |
Figure below shows a lever in use (a) To which class of levers does it belongs ? (b) Without changing the dimensions of the lever, if the load is shifted towards the fulcrum what happens to the mechanical advantage of the lever ? |
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Answer» (b) The MECHANICAL ADVANTAGE of the lever will increase when load is shifted towards the fulcrum. |
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| 6870. |
The sum of the reciprocals of object distance and image distance is equal to the ___________ of a mirror. |
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Answer» FOCAL length `1/(f)=1/(u)+1/(V)` |
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| 6871. |
(a) Figure shows two isosceles right angled prisms A and B and the light rays incident on the prism A. complete the diagram to show the rays emerging out of the prism B. (b) State the principle used for completing the ray diagram in part (a) above. |
Answer» Solution :(a) The completed RAY DIAGRAM is given below in FIGURE.  (b) The following two principles have been used : (i) The ray of LIGHT falling normally on the glass-air surface or air-glass surface, passes undeviated through it (i.e., if `i=0^(@),r=0^(@)`). (ii) The ray of light RAVELLING from glass, when strikes the glass-air surface at an angle of incidence equal to `45^(@)` which is greater than the critical angle (`=42^(@)` for glass-air), sufers total internal reflection. |
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| 6872. |
The focal length of convex lens is 20 cm. If an object of height 4 cm is placed at a distance of 30 cm from the lens, find: The magnification produced by the lens. |
| Answer» SOLUTION :2(INVERTED and REAL) | |
| 6873. |
What kind of mirror - concave, convex or plain would be best suited for use in a solar cooker ? Why ? |
| Answer» Solution :A CONCAVE mirror would be best SUITED for use in a solar cooker. When a concave mirror REFLECTOR is attached to a solar cooker , it converges a LARGE amount of Sun.s heat radiations at its focus due to which a high temperature is produced at the foucs AREA. | |
| 6874. |
Draw the electron dot structure and line structure of oxygen molecule |
Answer» SOLUTION :
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| 6875. |
In the experiment on finding the equivalent resistance of two resistors, connected in parallel, three students connected the voltmeter in their circuits, in the three ways X, Y and Z shown here. The voltmeter has been correctly connected in |
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Answer» cases X and Y only |
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| 6876. |
A boy putsa heavy box of mass M on his head and jumps down from the top of a multistoried buildingto the ground . How much is the force exertedby the box on hisheadduringhis forcefall ? Doesthe force ofgravity increaseduringthe fall ? |
| Answer» SOLUTION :F=mg . No, the FORCE of GRAVITY does not INCREASE . | |
| 6877. |
A uniform wire of resistance 50Omega is cut into five equal parts. These parts now connected in parallel. Find the equivalent resistance of the combination. |
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Answer» SOLUTION :`2Omega` `[because"Resistance of 1 part"(50Omega)/(5)=10Omega` `(1)/(R_(eq))("parallel")=(1)/(10)xx5=(1)/(2)` `(1)/(R_(eq))=2Omegal` |
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| 6878. |
What will you do? Why? Your sister has become incommunicative. She prefers to remain alone. |
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Answer» Solution :I will talk to HWR and try to find the reason for her behaviour. I will try to resolve her issue. After understanding her issue, if I feel that this issue cannot b e thandled by me then, I will TAKE halp of my PARENTS or techers. I will COMMUNICATE with her and try to help her and support her so THT she will come out of the present abnormal behaviour. |
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| 6879. |
What causes the potential difference between the two terminals of a cell? |
| Answer» SOLUTION :CHEMICAL reactions taking PLACE Within a CELL result in excess of electrons at the oneterminal and deficiency of electrons at the other terminal. | |
| 6880. |
The diagram of the direction of velocity at point 'M' of path when a body moves from P to Q. |
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Answer»
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| 6881. |
Explain Presbyopia using the following points- (b) Cause of this defect. |
Answer» Solution :(B) Generally, the focusing power of the eye lens DECREASES with age. The MUSCLES near the lens lose their ability to change the focal length of the lens. The near point of the lens shifts farther from the eye. Because of this old people cannot SEE nearby objects clearly. This DEFECT is known as presbyopia.
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| 6882. |
Suppose that a sound wave and a light wave have the same frequency, then which one has a longer wavelength? |
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Answer» Sound The light WAVE has the longer wavelength because it has MUCH GREATER speed. |
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| 6883. |
In a domestic electric circuit, mention the potential difference between a live wire and a neutral wire and frequency of an AC. |
| Answer» Solution :POTENTIAL difference between a live wire and a NEUTRAL wire in a domestic circuits it 220 V and the frequency of an AC is 50 Hz. | |
| 6884. |
Importance of outdoor games is unparalleled. |
| Answer» Solution :Outdoor games give good physical exercise.These games give many physicalbenefits. It improves PERSONAL discipline interaction with fellow PLAYERS and created SENSE of unity,Through play by DRIVING away the loneliness,mental STRESS and depression is reduced,The person becomes more social.Therefore it is said that the importance of outdoor games is unparalleled. | |
| 6885. |
What is a solenoid ? Mention two ways to increase the strength of the field of a solenoid |
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Answer» Solution :A coil of MANY circular turns of INSULATED copper wire wrapped closely in the shape of CYLINDER is called a solenoid. TWO ways to increase the strength of the field of a solenoid (i) By increasing the number of turns. (ii) By increasing CURRENT. |
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| 6886. |
Does the (light passing through a prism) split into more colours ? Why ? |
| Answer» Solution :We know the frequency of LIGHT is the property of the source and it is equal to number of WAVES leaving the source per second . This cannot be changed by any medium . Hence frequency doesn't change due to refraction . The COLOURED light passing through any transparent medium retains its colour. | |
| 6887. |
An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image. |
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Answer» Solution :As per SIGN convention f = + 15 CM and u = - 10 cm. As `(1)/(f) = (1)/(v) + (1)/(u) rArr (1)/(+15)= (1)/(v) + (1)/((-10)) rArr (1)/(v) = (1)/(15) + (1)/(10) rArr (1)/(v) = (5)/(30)` `therefore v = +6` cm. The image is formed 6 cm BEHIND the mirror, it is a virtural and erect image. |
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| 6888. |
In a circuit if two resistors of 5 Omega and 10 Omega are connected in series, compare the current passing through the two resistors. |
| Answer» Solution :In a SERIES connection of resistors, same current PASSES through all the resistors . Hence current will be same. Ratio of the current will be 1 : 1. | |
| 6889. |
Give a brief note on Moon missions. |
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Answer» Solution :1.The moon is the most closer astronomical object to the earth therefore the first space MISSIONS to objects in the solar system were the missions to the moon. 2. Such missions have so FAR been executed by USA, Soviet Union, European countries, China, Japan and India. 3. Till 1975, 15 space CRAFTS made chemical analysis of the moon and also measured its gravity, density and radiations. Last four crafts even landed on the moon and brought the samples of stones on the moon for analysis in the laboratories. All these missions were unmanned. 4. America also executed moon missions from 1962 to 1972. The specialty of these missions was that some of these were manned missions. In JULY, 1969, Neil ARMSTRONG became the first human to step on the moon. In 2008, Indian Space Research Organization (ISRO) successfully launched Chandrayaan - 1 and placed it an into an orbit around the moon. 
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| 6890. |
Assume that the forceof gravitationF prop 1/(r^(n)). Thenshowthat theorbitalspeed in a circularorbitof radiusr is proportional to1/(r^((n-1)//2)), whileits periodT isproportionaltor^((n+1)//2) |
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Answer» Solution :Kepler's first law: The orbit of a planet is an ellipse with the Sun at one of the foci. The adjoining FIGURE shows the elliptical orbit of a planet REVOLVING around the Sun. S denotes the position of the Sun. Kepler's second law : The line joining the planet and the Sun Sweeps equal areas in equal intervals of time. Area ASB=area CSD=areaESF. Kepler's third law : The square of the period of revolution of a plant around the sun is directly proportional to the cube of the mean distance of the planets from the Sun. Thus , if r is the average distance of the planet from the Sun and T is its period of revolution , then, `T^(2) prop r^(3), ` i.e. `(T^(2))/(r^(3))` =constant =K For simplicity we shall assume the orbit to be a circle. In the adjoining figure, S denotes the poistion of the Sun, P denotes the position of a planet at a given instant and r denotes the radius of the orbit(`-=` the distance of the planet from the Sun ). Here, the SPEED of the planet is uniform. It is `v=("CIRCUMFERENCE of the circle")/("period of revolution of the planet")=(2pir)/(T)` If m is the mass of the planet , the centripetal force exerted on the planet by the Sun(`-=` gravitational force), `F=(mv^(2))/(r)` `therefore F=(m(2pir//T)^(2))/(r)=(4PI^(2)mr^(2))/(T^(2)r) =(4pi^(2)mr)/(T^(2))` Accordign to Kepler's third law, `T^(2)=Kr^(3)` `therefore F=(4^(2)mr)/(Kr^(3))=(4pi^(2)m)/(K)((1)/(r^(2)))` Thus, `F prop (1)/(r^(2))` as `(4pi^(2)m)/(K)` is constant in a particular case.  
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| 6891. |
Whichinstrument is used to know the presence of an electriccurrent ? |
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Answer» Fuse |
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| 6892. |
Use the data in Table 2 to answer the following: Which material is the best conductor ? |
| Answer» SOLUTION :Silver metal has the lowest electrical resistivity of `1.60 XX 10^(-8)OMEGAM` , THEREFORE silver metal is the best conductor of ELECTRICITY. | |
| 6893. |
The source of energy of the sun is |
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Answer» CONVERSION of HYDROGEN gas into helium |
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| 6894. |
Explain that why is it said like that? Effective disaster management makes us well prepared for future. |
| Answer» Solution :(1) Disaster can strike any time. The sudden disasterscan be man-made with some bad intentions or MAY be accidental. (2) When natural calamity-strikes it is a very sudden and has ahuge impact. Large scale DEVASTATION of property and general environment degradation occurs along with substantial mortality of PEOPLE and animals . (3) Therefore, it is most appropriate to have the preparedness to reduce the impact of any disasters that may strike in the future. (4) We cannot control the onset of the natural disaster, but wecan definitelyreduce the harsh effects of the disaster by following disaster management PLAN. | |
| 6895. |
Can you run electric geysor with power rating 2 kW, 220 V on a 5 A line ? Give reason to justify your answer. |
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Answer» <P> Solution :`I=(P)/(V) = (2000)/(220) = 9.09A`No we cannot RUN . Current needed is more than 5 A. |
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| 6896. |
Metal X is found in nature as its sulphide XS. It is used in the galvanisation of iron articles. Identify the metal X. How will you convert this sulphide ore into the metal ? Explain with equations. |
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Answer» Solution :• The METAL X is zinc. • The sulphide ore is first heated STRONGLY in supply of OXYGEN and changed into its oxide. This process is called roasting. • `2ZnS+3O_(2)overset("Heat")rarr 2ZnO+2SO_(2)` • Zinc oxide is then reduced to zinc metal by heating it with carbon. This process is called reduction. `2ZnO+C overset("Heat")rarr 2Zn+CO_(2)` |
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| 6897. |
What would you duggest to a student if while performing an experiment he finds that the pointer/needle of theammeter and woltmeter do not coincide with the zero marks on the scales when circuit is open? No extra ammeter/voltmeter is available in the laboratory. |
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Answer» Solution :This is called the zero ERROR of the scale of ammeter or VOLTMETER. If there is a zero error, then this error is subtracted from the VALUE that is DEPICTED when the circuit is closed, otherwise, the ACCURATE current or potential difference will not be recorded. |
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| 6898. |
The dimensions of light year is |
| Answer» SOLUTION :Light year = distance = L | |
| 6899. |
Statethe characteristics of the magnetic field produced by a current- carryign solenoidsketic itsmagnetic field . |
Answer» Solution :A helical coil consitingof closely woundturns of insulated copper(conducting ) wireiscalled a solenoid .  Whenan electric currentis passed through the solenoid , it produces a magnetic fieldthrough and AROUND it . Thepatter of magneticfieldlines of themagneticfieldthroughand arounda currentcarryingsolenoid is SHOWN in figure 13.14  Themagneticfieldproduced by a currnetcarryingsolenoid similarto thatproduced by a bar magnet. (1) Directlyproportional to the currentI flowingthrough it , i.e., `B prop I` (2) Directly PROPORTIONALTO the numberof turnsper unitlength n of the solenoid i.e., `B prop n` or `B prop (N)/(l)` , where , N = totalno . of TURNS of the solenoidandl = length of the solenoid . (3) Dependentof the nature of the" corematerial "used in makingthe solenoid . ( Useof SOFT iron rod as core in a solenoidincrease the strength of magneticfield ). |
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| 6900. |
How will the increasing energy needs and conservation of energy influence international peace, cooperation and security ? Discuss. |
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Answer» Solution :1) The increasing energy needs and conservation of energy influence international peace, co-operation and security. 2) For example, many GREAT nations depend on the gulf countries and many countries for fuel (Petrol, diesel etc.). The need of fuel brings co-operation AMONG the countries. Also the need of energy (electricity, fuel etc.,) link all nations to a small circle so that there comes the peace, co-operation and security. 3) Atomic energy, THERMAL energy, chemical energy etc., bring UNITY among all nations. |
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