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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.
| 951. |
Name the mirror that can give an erect and enlarged in age of an object. |
| Answer» Solution :When an object is placed between the pole and the PRINCIPAL focus of a concave mirror the IMAGE formed is virtual, erect and ENLARGED. | |
| 952. |
A coin is placed at the bottom of a beaker containing water (refractive index=4/3) at a depth of 12cm. By what height the coin appears to be raised when seen from vertical above ? |
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| 953. |
Calculate the amount of heat required to convert 10g of water at 30^(@)C into steam at 100^(@)C. ( Specificlatent heat of vaporization of water = 540cal//g) |
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| 954. |
What are the qualities of an ideal source of energy? |
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Answer» Solution :An ideal SOURCE of ENERGY is one which : (i) PROVIDES a large amount of energy per unit volume or mass. (ii) Is EASY to store and transport |
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| 955. |
Distinguish between renewable and non - renewable sources of energy. Also give an example of each of these sources. |
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Answer» SOLUTION :RENEWABLE sources of energy • They are constantly supplied by nature and are in exhastible • Low COST of operation • They produce little or no pullutants. Thus minimum impact on è environment. E.g.wind energy, solar energy Non - Renewable • They do not renew or regenerate and are exhaustible • High cost of operation • They produce a lot of pollutants. E.g COAL, PETROLEUM etc.. |
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| 956. |
Controlled chain reaction is used in atom bomb. |
| Answer» SOLUTION :CONTROLLED chain reaction is USED innuclear BOMB. | |
| 957. |
The leech is used in ayurvedic system of treatment. |
| Answer» Solution :(1) Leeches are blood sucking ectoparasite. InAyurveda leech is used to remove impure bloodand blood clots. (2) Such blood is sucked up by leeches and then the patient GETS some RELIEF. (3) In the leech body there is ASUBSTANCE called hirudine which prevents blood CLOTTING as it sucks up the blood. (4) This hirudine is also used for medicinal purpose. | |
| 958. |
Humidity : |
| Answer» Solution :The presence of water VAPOUR in the air makes it moist. This MOISTURE in the atmosphere is CALLED humidity. | |
| 959. |
A body is acted upon by a number of external forces. Can it remain at rest ? |
| Answer» SOLUTION :Yes, if the external forces ACTING on the body can be REPRESENTED in magnitude and DIRECTION by the sides of a closed polygon taken in the same order. | |
| 960. |
Let the resistance of an electrical component remains constant while the potential difference across the two ends of the components decreases to half of its former value. What change will occur in the current through it ? |
| Answer» Solution :CURRENT flowing in the CONDUCTOR will ALSO BECOME half. | |
| 961. |
Name the functional group present in CH_(3)COCH_(3) |
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Answer» Alcohol |
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| 963. |
Danger signals installed at airports and at the top of tall buildings all of red colour. These signals are visible from a distance. It is because |
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Answer» red coloured light is scattered the most from atmosphere particles. |
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| 965. |
Simranjit studies in tenth class in a school. There are fifty students in his class. Most of the students come to the school by separate cars driven by their parents and also go back by separate cars. One day their science teacher was teaching the chapter on sources of energy. He told the students that the fossil fuels are limited in nature and we should make efforts to conserve them by reducing their consumption. Hearing this, an idea came to Simranjit's mind which he shared with the three classmates who live in the same area. All these students liked the idea. These studentstalked to their parents, and even the idea mooted by Simranjit ? (a) What could be the idea mooted by Simranjit ? (b) Why was this idea mooted ? (c) How did this idea help the environment ? (d) How did this idea help the individual parents ? (e) What values are displayed by Simranjit in mooting this idea ? |
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Answer» Solution :(a) The idea mooted by Simranjit was that since four of them come to school from the same AREA, they should form a 'car pool' in which four of them come and go by ONE car, turn by turn. (B) The idea of 'car pool' was mooted to conserve (or save) petrol fuel (which comes from a fossil fuel petroleum) because it is non-renewable and present in limited quantity in earth. (c) The idea of 'car pool' helped the environment by decreasing air pollution because less fuel (like petrol) is burned in one car daily (than four cars). (d) The idea of 'car pool' helped the individual parents by providing them more spare time for doing other work (because only one of the parents had to do the duty of taking all the four students to school and bring them back. The other three parents are free on this day). (e) The values displayed by Simranjit in mooting the idea of 'car pool' are (i) To conserve (or save) the non-renewable and fast depleting fossil fuel petroleum (so that it could last for as long as POSSIBLE) (ii) To reduce air pollution CAUSED by the excessive burning of petroleum fuels, and (iii) Strengthening the bonds of friendship among classmates (by travelling together in one car daily). |
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| 966. |
An object is situated at a distance of 10 cm from the optical centre of a convex lens of focal length 20 cm. The image formed on the screen is found to be an erect and enlarged image. |
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| 967. |
Name the device which is used to reverse the direction of current in the coilof a motor. |
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| 968. |
Collapsing of houses, developing cracks in land are some of the effect of ............. . |
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| 969. |
Match the following {:(1."Snell's law",-,(a)"25cm"),(2."Rayleigh scattering",-,(b) "Diverging lens"),(3."Mie scattering",-,(c)"converging lens"),(4."Bi - Convex lens",-,(d)"Front surface of an eye ball"),(5."Bi - concave lens",-,(f)"Infinity"),(6."Cornea",-,(g)"The sky to appear in blue colour"),(7."Near point of eye",-,(h)(sini)/(sinr)=(mu_(2))/(mu_(1))),(8."Far point of eye",-,(i)"White apperance of the clouds"),(9."Presbyopia",-,(j)"Torrid lenses"),(10."Astigmatism",-,(k)"Bifocal lenses"):} |
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Answer» The sky to apper in BLUE colour White appearance of the clouds CONVERGING lens Diverging lens Front surface of an eye ball 25CM Infinity Biofocal lenses Torrid lenses |
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| 970. |
(a) With the help of a labelled diagram, explain the distributionof mgnetic field due to a current through a circular loop. Why is it that if a current carrying coil has n turns the field produced at any point is n times as large as that produced by a single turn? (b) Draw a pattern of magnetic field formed around a current carrying solenoid. What happens to the magnetic field when the current through the solenoid is reversed? |
Answer» Solution :(a) The pattern of the magnetic field lines near the WIRES of the coil are concentric circles. The diameter of these circles goes on increasing as we MOVE away from the WIRE. At the centre of the circular loop, the field line are nearly STRAIGHT and parallel.  (b) Magnetic field also gets reversed. 
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| 971. |
Embryology. |
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Answer» Solution :(1) EMBRYOLOGY is the study of developing embryos. (2) These embryos in their intitial stages are very similar to each other. (3) These similarities DECREASE later in the development. (4) This similarity in initial stages indicate that these vertebrates have originated from a common ancestor. (5) In evolutionary science, comparative study of embryos of various vertebrates provide EVIDENCE for evolution. |
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| 972. |
Distinguish between Glycolysis and Krebs cycle |
Answer» SOLUTION :
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| 973. |
(a) What isa solenoid ? Draw a sketch to show the magnetic field pattern produced by a current-carrying solenoid. (b) Name the type of magnet with which the magnetic field pattern of a current-carrying solenoid resembles. (c ) What is the shape of field lines inside current-carrying solenoid ? What does the pattern of field lines inside a current-carrying solenoid indicate ? (d) List three ways in which the magnetic field strength of a current-carrying solenoid can be increased ? (e) What type of core should be put inside a current-carrying solenoid to make an electromagnet ? |
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| 974. |
(iii) H_(2)SO_(4(aq)) + NaOH_((aq))to Na_(2)SO_(4(aq))+ H_(2)O_((I)) |
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Answer» Solution :Rewrite the given equation as it is ` H_(2)SO_(4(aq)) + NaOH_((aq)) to Na_(2)SO_(4(aq)) +H_(2)O_((l))` STEP 2 : Write the number of atoms of each element in the unbalanced equation on both sides of the equation .  The number of OXYGEN atoms involved in different compounds on both sides (reactants and PRODUCTS) are equal. THEREFORE, balance the number of atoms of the second element, sodium. Step 3 :To balance the number of sodium atoms :  To equalise the number of sodium atoms, we use 2 as the factor of NaOH in the reactants. Now, the partly balanced equation becomes as follows : ` H_(2)SO_(4) + 2NaOH to Na_(2)SO_(4) +H_(2)O` Step 4 : Now, balance the number of hydrogen atoms :  To equalise the number of hydrogen atoms, we use 2 as the factor of ` H_(2)O` in the products. The equation then becomes `H_(2)SO_(4) + 2NaOH to Na_(2)SO_(4) + 2H_(2)O` Now, count the atoms of each element on both sides of the equation. The number of atoms on both sides are equal. Hence, the balanced equation is ` H_(2)SO_(4(aq)) + 2NaOH_((aq)) to Na_(2)SO_(4) + 2H_(2)O_((l))` |
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| 975. |
(a) What is the law of dominance of traits ? Explain with an example.(b) Why are the traits acquired during the life time of an individual not inherited ? Explain. |
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Answer» Solution :(a) According to Law of Dominance, a single copy of gene when present in heterozygous condition in an individual can express itself and is said to dominant. Example : Gregor Johann Mendel, through consistent studies on Garden Pea arrived at laws of inheritance. He used plants that were pure breeding for a trait and considered CONTRASTING characters like – tall and short plant size, round and wrinkled SEEDS, white and violet flowers ETC. In his experiments, he CROSSED plants with contrasting characters, studied the progeny of first generation (F1) and second generation (F2) and calculated ratios of plants with contrasting characters that were original parental type or different. For example, he crossed a tall pea plant with a dwarf pea plant. He found that in first generation (F1) all the plants produced were tall. Thus, F1 generation can be shown as-  Since F1 plants are .Tť, they have inherited .t. from one parent but not expressed. (b) Any change in non-reproductive TISSUES cannot be passed on to the DNA of the germ-cells. Therefore, the traits acquired during life-time of an individual are not inherited. |
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| 976. |
Which mirror has a larger field of view:convex or concave? |
| Answer» SOLUTION :CONVEX mirror has LARGER FIELD of view. | |
| 979. |
When electrolysis of water is done then : (a) Identify the gases evolved at cathode and anode. (write equations also) (b) Why is amount of gas collecte in one of the other ? Name this gas . |
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Answer» Solution :(a) At cathode `H_(2)` gas, At anode `O_(2)` gas (B) The volume of `H_2` gas at cathode is double than volume of `O_(2)` gas collected at anode as in `H_(2)O`molecule, TWO parts of HYDROGEN combine with one part of oxygen (by their volume) |
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| 981. |
Which propertyof a proton can change while it movas freely in a magnetic field ? |
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Answer» mass |
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| 982. |
The power of a concave lens is -2.5 dioptres. Find it focal length.Calculate the focal length of a corrective lens having power +2.5 D. |
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Answer» Solution :DATA : Convex lens , `P=-2.5 D , F=?` `P=1/ftherefore -2.5D=1/f` `f=-1/(2.5D) = -0.4 m =-40CM` The focal LENGTH of the lens = -40cm. |
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| 983. |
Charges Q, 2Q and 4Q are uniformly distributed in three solid spheres 1,2 and 3 of radii R//2. R and 2R respectively, as shown in Fig.If magnitude of the electric fields at point P at a distance R from the centre of sphere 1,2 and 3are E_(1), E_(2) and E_(3) respectively, then |
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Answer» `E_(1) GT E_(2) E_(3)` |
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| 984. |
What is the dircetion of electrons in a circuit ? |
| Answer» SOLUTION :LOW POTENTIAL to HIGH potential. | |
| 985. |
A boy uses blue colour of light to find the refractive index of glass. He then repeats the experimentusing red colour of light. Will the refractive index be the same or different in the two cases? Givea reason to support your answer. |
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Answer» Reason: The SPEED of blue light in glass is LESS than that of RED light and refractive index of glass is `mu=(c)/("speed of light in glass")." "therefore mu_("blue") gt mu_("red")`. |
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| 986. |
If the current flowing through a fixed resistor is halved, the heat produced in it will become: |
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Answer» Double |
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| 987. |
Which of the following astronauts travelled through space shuttle 'Discovery' first time? |
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Answer» KALPANA chawla |
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| 988. |
Assertion : Mass of a body is defined as the gravitational force exerted on it due to earth's gravity alone Reason : "Weight"= "mass" xx" acceleration due to gravity". |
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| 989. |
Electromagnets are of strength : |
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| 990. |
A strong sound signal is sent from a ship towards the bottom of the sea. It is received back after 1s. What is the depth of sea given that the speed of sound in water 1450ms^(-1)? |
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Answer» Solution :VELOCITY of sound in water = `=("Distance TRAVELLED by sound")/("Time TAKEN")` Depth of the sea, d = velocity `XX` time `d=(vt)/(2)=(1450xx1)/(2)` `d=725m` |
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| 991. |
Real expansion of a liquid is equal to the difference between apparent expansion and expansion of vessel |
| Answer» SOLUTION : REAL EXPANSION = APPARENT expansion + expansion of VESSEL | |
| 992. |
A bottle of water at 0^@C is opened on the surface of moon. What will happen? |
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Answer» Water will BOIL |
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| 993. |
Generally, sacred grovesare the forests conserved by government forest department. |
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Answer» SOLUTION :FALSE. Generally, sacred GROVES are the forests CONSERVED by the society and not by the GOVERNMENT FOREST department. |
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| 994. |
Sheena was very excited to see her Aunt after a long time. Her mother fried a lot of snacks for her Aunt. Suddenly Sheena came to know that her aunt has postponed her plan for tomorrow. Sheena's mother got worried to know this. She thought the food will get spoiled. Sheena helped her mother to preserve the food. Answer the following questions based on above passage. (i) Why does food spoil when kept for a very long time? (ii) What method did Sheena suggest her mother to preserve the food? (iii) What values are shown by Sheena? |
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Answer» Solution :(i) When food is kept for a very LONG TIME, it gets oxidised and becomes rancid. (ii) Sheena SUGGESTED her mother to keep the SNACKS in an air tight CONTAINER. (iii) Intelligency, applying knowledge, helpful. |
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| 995. |
Farmers are using a large number of pesticides and fertilisers in their fields to increase crop production and to enhance their profits. But by doing so, they are causing damage to the soil as well as to the environment. Answer the following questions based on the above situation: (i) Do you agree with this statement? (ii) Why should we avoid eating fruits and vegetables without washing them properly? (iii) What values are neglected by the farmers? |
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Answer» Solution :(i) Plants REQUIRE a specific pH range for their healthy growth. By using a large number of PESTICIDES and fertilisers, pH of the soil changes, which makes it more acidic or BASIC. So, in the long run, the soil becomes infertile. This leads to soil erosion, damaging the environment also. So, use of these pesticides and fertilisers should be restricted. (ii) The CHEMICAL pesticides sprayed by the farmers in their fields, stick to the fruits and vegetables. So, they should be removed by washing properly, before eating. (iii) Care towards society, UNSELFISHNESS. |
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| 996. |
Explain with diagram step-by-step energy conversion in: Thermal power plant : |
Answer» Solution :In thermal power plant the turbines are rotated using steam. Here the COAL is burnt. The heat energy liberated from this burning is USED to heat the WATER in the boiler. This water produces steam of very  high temperature and pressure. The kinetic energy in the steam rotates the turbines. The ROTATION of turbines produces its own mechanical kinetic energy. The generators connected to turbines produce ELECTRICAL energy. The steam is condensed in a condenser and converted back into water. In this way in thermal power plant, thermal energy to kinetic energy, kinetic energy into mechanical energy and mechanical energy to electrical energy, are the conversions that take place. |
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| 997. |
State the function of each of the following parts of the human eye : (i) Cornea (ii) Iris (iii) Pupil (iv) Retina Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools. |
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Answer» Solution :(i) Cornea : Refer to Topic- I, LATQ Q.1. (i) Iris : To control the size of the pupil. (iii) Pupil : To regulate and control the amount of light entering the eye. (iv) Retina-To act as a screen to obtain the image of OBJECT and generate electrical signals which are sent to the brain via optic nerves. Ways of motivating people for the noble cause of eye DONATION are street PLAY, banners, POSTERS, door to door campaign etc. Objectives- (i) To develop the habit of group WORK. (ii) To work for a common cause. |
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| 998. |
Draw the diagram of the arrangement of apparatus showing the reaction of zine granules with dilute sulphurle acid and testing hydrogen gas by burning and label the soap bubbles filled with hydrogen. i) Soap solution (ii) Delivery tube |
| Answer» Solution :Departmental Model QUESTION Paper - 1 Q. No. 23 | |
| 999. |
Electric field due to an electric dipole is |
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Answer» SPHERICALLY symmetric |
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| 1000. |
The radius of atom is of the order of 1A^(@) & radius ofNucleus is of the order of fermi. How many magnitudes higher is the volume of the atom as compared to the volume of nucleus ? |
| Answer» SOLUTION :`(V_("ATOM"))/(V_("NUCLEUS"))=(4PI(10^(-10)m)^(3))/(4pi(10^(-15)m)^(3))=10^(15)` | |