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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.
| 8051. |
What is theshape of magneticfield lines due toa straight current- carrying conductor ? |
| Answer» Solution :CONCENTRIC CIRCLES AROUND the CONDUCTOR with conductor at the centre. | |
| 8052. |
In nuclear fission, neutron is bombarded on atom of |
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Answer» URANIUM 236 |
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| 8053. |
Natural gas consumption in world 22% : : Natural gas consumption in India : _________________ |
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Answer» Natural gas consumption in the world is 22% and natural gas consumption in India is 8%. |
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| 8054. |
State Snell's law. |
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Answer» Solution :The ratio of the sine of the angle of incidence and sine of the angle of refraction is equal to the ratio of refractive indices of the TWO MEDIA . This law is also KNOWN Snell .s law. `(sini)/(sinr)=(mu_(2))/(mu_(1))` |
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| 8055. |
The value of resistivity of super conductor is |
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Answer» ZERO |
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| 8056. |
An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h. |
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Answer» <P> SOLUTION :I = 5A, V = 220 V, t = 2hP = VI = `200xx5` = 1100W. ENERGY CONSUMED = `Pxxt=1100Wxx2h=2200Wh=2.2kWh`. |
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| 8057. |
Which of the following force is responsible for the flow of water in rivers ? |
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Answer» FORCE of FRICTION |
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| 8058. |
If energy can neither be created nor destroyed, explain with an example why we should worry about our energy resources ? |
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Answer» Solution :Energy used is dissipated in less usable FORM. The energy used is consumed and cannot be used again. Example : BURNING of `"CANDLE"RARR"light" + "heat"`but PRODUCTS cannot produce chemical energy. |
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| 8059. |
What is meant by least distance of distinct vision? |
| Answer» Solution :It is the minimum distance up to which EYE can SEC CLEARLY and is CALLED the least DISTANTE ofdistinct vision. | |
| 8060. |
Series resistors connected in series from a ____________ circuit. |
| Answer» SOLUTION :PARALLEL SERIES | |
| 8061. |
Name a mirror that can give an erect enlarged image of an object. |
| Answer» SOLUTION :Only a CONCAVE mirror can give an erect and ENLARGED image of an object. | |
| 8062. |
Find the value of one light year in giga meters. |
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Answer» `8.96xx10^6Gm` |
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| 8063. |
How does the tank appear to a viewer from outside ? |
Answer» Solution :If we see a water tank, its BOTTOM appears to be CONCAVE SHAPED although it is plane. Rays from A after striking water-air interface bend away from normal. The point A appear to be at A. i.e., the bottom appears to be RAISED and concave. 
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| 8064. |
Heat is measured in ............ |
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Answer» Joule |
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| 8065. |
Define Raman scattering. |
| Answer» Solution :Raman Scattering is defined as "The interaction of light RAY with the particles of pure LIQUIDS or transparent SOLIDS, which leads to a change in wavelength or frequency.". | |
| 8066. |
ln an electric field the work done in bringing a 2 coulomb charge from infinity to a point A is 10 joules and in bringing the same charge to some another point 8 is 20 joules. Find the potential difference between two points A and 8. What would be the work done if the same charge is brought directly from A to 8 ? |
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Answer» Solution :Work done =10 JOULE Charge =2 Coulomb Potential of point A `= V_(A)=(10J)/(2C)= 5 V` Given work done = 20 Joule Charge = 2 coulomb . Potential of Point B = `V_(B)= (20J)/(2C)= 10`V Potential difference between two POINTS A and B is `V=V_(B)-V_(A)` = 10V -5V = 5 V . Work done DIRECTLY from A to B . Work done = Potential difference `xx` charge `= 5V xx2` C = 10 Joule |
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| 8067. |
Rohan is not able to contract his iris properly due to defect in his eyes. Rohan would not be able to see : (i) in dim light (ii) in bright light (iii) nearby objects (iv) distant objects |
| Answer» SOLUTION :(ii) In bright light. SINCE the iris is not ABLE to contract, in bright light, too much light WOULD enter into the eyes and Rohan would be not be able to see anything except a bright glare of light. | |
| 8068. |
Which instrument is used to measure electric current ? |
| Answer» SOLUTION :An ammeter is used to MEASURE electric CURRENT in a circuit. It is always connected in SERIES to the circuit. | |
| 8069. |
(a) Draw a sectional view of the human heartand label on it, pulmonary artery, Right auricle, vena cava, pulmonary vein (b) Explain why ventricles have thick muscular walls than the atria. ? |
| Answer» Solution :(B) Ventricles have THICKER MUSCULAR walls than atria, as the ventricles have to PUMP the blood to arteries which carry it to the longer DISTANCE | |
| 8070. |
What is naturalselection? |
| Answer» Solution :During the STRUGGLE for existence, the organisms which can overcome the CHALLENGING situation, survive and ADAPT to the SURROUNDING environment. Organism which are unable to FACE the challenges are unfit to survive and disappear. The process of selection of organisms with favourable variation is called as Natural selection. | |
| 8071. |
The length of a wire is doubled and its cross sectional area is also doubled. What is the change in its resistivity? |
| Answer» Solution :There is no CHARGE because resistivity of a MATERIAL DEPENDS only on its nature. | |
| 8072. |
A person may suffer from both myopia and hypermetropia defects.(a) What is this condition called?(b)When does it happen?(c) Name the type of lens often required by the persons suffering from this defect. Draw labelled diagram of such lenses. |
| Answer» Answer :C | |
| 8073. |
A mass M splits into two parts m and (M-m), which are separated by a cetain distance. The ratio m"/"M which maximizes the gravitational force between the parts is |
| Answer» Answer :C | |
| 8074. |
Blue colour of sky is due to the phenomenon of scattering. What are the advantage of using infrared photography? |
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Answer» |
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| 8075. |
Planetary motion in the solar system describes. |
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Answer» CONSERVATION of kinetic energy `rArr VECL` = constant. |
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| 8076. |
Aslam is welder by profession who was working at Mohan's house. After making a 'railing' by using electric welding with naked eyes, Aslam was using a grinder on it to smoothen the welding joints. Just then some particle fell into Aslam's eye. He started crying with pain. Mohan hired an auto and took him to an eye hospital. In the hospital, doctor used a device connected to two electric wires to remove the particle from Aslam's eye. Aslam asked Mohan what had fallen into his eye and what device was used by the doctor to remove that particle from the eye. Being a science student of class X, Mohan explained everything to Aslam and asked him to be careful in future. (a) What could be the particle which fell into Aslam's eye ? (b) What device was used by the doctor to remove the particle and how it worked? (c) What precautions should be observed by Aslam while doing electric welding and grinding work ? (d) What values are shown by Mohan during this episode ? |
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Answer» Solution :(a) An iron particle fell into Aslam's EYE while using the grinder on iron railing. (b) The doctor used an electromagnet to remove the tiny iron particle form Aslam's eye. Electromagnet is a powerful magnet and the iron particle in the eye is strongly attracted by the electromagnet, stick to the electromagnet and gets removed. (c) Aslam should use some DEVICE to protect his eyes while doing electric welding or using a grinder. Such EN eye-protecting device can be welding helmet, hand held shield or welding goggles. (d) Mohan showed the values of (i) Ability to handle a serious situation with calmness, and (ii) Desire to help OTHERS (by rushing Aslam to an eye hospital). |
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| 8077. |
Why are water droplets are seen on the outer surface of a cold drink bottle? |
| Answer» Solution :(1) The temperature of the outer surface of a cold drink bottle is less than that of the atmosphere. (2) THEREFORE, the excess of water VAPOUR from the air CONDENSES to FORM droplets on the outer surface of the cold drink bottle. | |
| 8078. |
A copper block of 2 kg is heated in a furnace from30^(@)C" to " 460^(@)C and then placed on thick ice block. Calculate specific heat of copper if mass of ice melted is I kg. (Given: Latent heat of fusion of ice = 333 kJ/kg) |
| Answer» SOLUTION :`387.2 J//kg ^(@)C` | |
| 8079. |
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) Pushed into the coil Withdrawn from inside the coil (iii) Held stationary inside the coil |
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Answer» SOLUTION :(i) The needle of the falvanometer SHOWS a MOMENTARY deflection in a PARTICULAR direction (ii) The needle of the galvanometer shows a momentry in the OPPOSITE direction (iii) The needle of the galvanometer shows no deflection |
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| 8080. |
The laws of reflection are true for |
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Answer» the plane MIRROR only |
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| 8081. |
Density of any liquid can be determined by using …………… |
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Answer» hydrometer |
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| 8082. |
Give reasons During the daytime, water and minerals travel faster through xylem as compared to the night. |
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Answer» Solution :Transpiration is a MAIN factor for uptake of water and MINERALS as it results in suction pull. Hence it is FASTER during day as compared to at NIGHT. |
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| 8083. |
which of the folloeingrepresent a precipitation reaction ? |
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Answer» `A_((s))+B_((s))toC_((s))+D_((s))` |
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| 8084. |
What are the limitation of extracting energy from -a) the wind ? b) Wave? c) tides? |
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Answer» Solution :a) A wind mill requires wind of speed more than 15km/h to generate ELECTRICITY from wind energy also large number of wind mills are REQUIRED to get feasible output which covere a large area. b) very strong OCEAN waves are required in order to exteract energy from waves, c) Very HIGH tides are required in order to extract energy from tides, Also, occurance of tides DEPENDS on the relative positions of the sun, moon amd the earth. |
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| 8085. |
List three advantages of harnessing wind energy. |
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Answer» SOLUTION :The ADVANTAGES of HARNESSING WIND energy are : (i) It is an environment-friendly and efficient source of renewable energy. (ii) It requires no RECURRING expenses for the production C of electricity. (iii) It does not cause any pollution. |
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| 8086. |
Collect the names of extinct birds and animals of India and tell those names to others. |
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Answer» Solution :Himalayan QUAIL and pink-headed duck are birds of INDIA BELIEVED to be extinct. Asiatic CHEETAH and Indian aurochs are some of the extinct ANIMALS of India. |
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| 8087. |
A social worker was addressing people at an eye donation camp organised in a colony. He said that there are millions of blind people in our country who cannot see at all. The eyesight of most of these blind people can be restored if we donate our eyes by making a pledge in writing to the eye bank that, after our death, our eyes should be removed and given to the blind people. He said, in this way we can pass on the priceless gift of vision to our blind brothers and sisters to light up their dark world, without losing anything. By listening to the social worker, many people (including some students) filled up the pledge forms to donate their eyes, after death. (a) Whitin how much time of the death of person, his donated eyes must be removed and preserved so as to remain good for transplantation ? (b) What happens to those donated eyes which are not good for transplanation ? (c) Can a person having AIDS disease donate eyes ? (d) Can a person having diabetes disease donate eyes ? (e) How many blind people can get eyesight if ten persons their eyes ? (f) What values of social worker are exhibited by his address ? |
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Answer» Solution :(a) The eyes must be removed within 4 to 6 hours of a person's death. (B) Those donated eyes which are not good for transplantation are used for doing research and for teaching purposes in medical colleges. (c) No (d) YES (e) One person donates two eyes, so ten persons donate `2 xx 10 = 20` eyes. These 20 eyes can give eyesight to 20 blind persons (each blind person getting one eye). (F) The social worker exhibits values of (i) AWARENESS (about the donation of eyes) (ii) Concern for blind people (that they get eyesight to see this BEAUTIFUL world), and (iii) Motivational skill (to get the people pledge for eye donation). |
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| 8088. |
Phase wire, Fuse wire, Neutral wire, Earth wire |
| Answer» SOLUTION :FUSE wire. The REST are the THREE types of cables USED in the electric supply. | |
| 8089. |
Explain measurement of specific heat: Mixing method and calorimeter. |
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Answer» SOLUTION :1.The specific HEAT of an object can be measured using mixing method. 2. For this method, a calorimeter is used. 3. If a hot solid object is put in the WATER in a calorimeter, heat EXCHANGE between the hot object and the water and calorimeter starts. This continues till the temperatures of the solid object, water and the calorimeter become equal. 4. Therefore, Heat lost by solid object= Heat gained by water in calorimeter+ Heat gained by the calorimeter. 5. Here, heat lost by the solid object (Q) = mass of the solid object x its specific heat x decrease in its temperature. 6. Similarly, heat gained by the water (`Q_1`)= mass of the water x its specific heat x increase in its temperature as, 7. Heat gained by the calorimeter (`Q_2`)= mass of the calorimeter x its specific heat x increase in its temperature. 8. Heat lost by hot object= Heat gained by calorimeter+ Heat gained by water. `Q=Q_2+Q_1` . 9. Using these equations, if the specific heat of water and the calorimeter are known, the specific heat of the solid object can be calculated. |
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| 8091. |
The energy of water is called |
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Answer» MECHANICAL energy |
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| 8092. |
How does the shredded ice convert into solid ice ball (during the preparation of an ice ball)? |
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Answer» Solution :i. While preparing an ice BALL, the shredded ice is pressurised around the tip of the stick. ii. Applied PRESSURE lowers the melting point of ice below `0^(@)C`causing it to melt momentarily. iii. This merges shredded ice pieces into one. iv. Once pressure is removed, due to regelation freezing point is restored to`0^(@)C` and the piece re-freezes in the FORM of single solid ice ball. |
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| 8093. |
Two resistors of 1 kOmega and 200Omega are connected in series with a 12V battery. Calculate the current flowing in the circuit and the voltage developed across the 200Omega resistor. |
| Answer» SOLUTION :`I =0.01 A, V = 2V` | |
| 8095. |
Compare the variations in alternating current and direct current using graphs. |
Answer» Solution :i. Direct current flows in ONE direction, but it can increase, can be stable, or can reduce as shown in GRAPH (a). ii. Alternating current is oscillatory. It INCREASES to a maximum, then reduces to ZERO and increases to maximum in the reverse direction and again reduces to zero. These oscillations of the alternating current can be represented in a SINUSOIDAL manner as shown in graph (b). 
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| 8096. |
What is bolting? |
| Answer» SOLUTION :SUDDEN shoot ELONGATION followed by flowering is KNOWN as bolting. Artificially bolting can be induced on rosette PLANTS by the treatment of Gibberellins. | |
| 8097. |
What is the reason for atmospheric refraction ? |
| Answer» Solution :VARYING temperatures in different regions of the ATMOSPHERE cause CHANGES in DENSITY and hence REFRACTIVE indices. This causes refraction of light travelling through the atmosphere. | |
| 8098. |
Measure the resistance of a bulb (filament) in open circuit with a multi-meter. Make a circuit with elements such as bulb, battry of 12V and key in siries. Close the key. Then again measure the resitance of the same bulb (filament) for every 30 seconds Record the observation in a proper table. What can you conclude from the above results ? |
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Answer» Solution :When the bulb is CONNECTED in circuit and KEY is closed. The resistance DECREASES for every 30 seconds. Conclusion : 1. The potential DIFFERENCE of a battery does not change even in OPEN or closed circuit. 2. The resistance of a conductor decreases as temperature increases. |
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| 8099. |
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3. |
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Answer» SOLUTION :The REFRACTIVE index of water is minimum, so SPEED of light will be MAXIMUM in water, because in a medium of higher refractive index, the speed of the light is lower, as `v=c/n` |
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| 8100. |
In (Fig. 2.30), locate the angle of prism and angle of deviation. |
| Answer» SOLUTION :In (Fig. 2.30), `/_BAC` is the angle of PRISM,and `/_HGF` is the angle of deviation. | |