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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.
| 5551. |
Images formed by convex lenses for different position of the object. Object beyond 2F_(1) Image formation - (a) Between F_(2) and 2F_(2) (b) Real, inverted and diminshed |
Answer» SOLUTION :
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| 5552. |
Explain the construction of Simple Microscope. |
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Answer» Solution :(i) Simple microscope : Simple microscope has a convex lens of short LENGTH. It is held near the eye to get enlarged image of small objects. (ii) Let an object (AB) is placed at a POINT within the principal focus `(mu lt f)` of the convex lens and the observer's eye placed just behind the lens. (iii) As per this POSITION the convex lens producesa erect , virtual and enlarged image (A'B') . The image formed is in the same SIDE of the object and the distance equal to the least distance of distinct vision (D) (D=25 CM for normal human eye) 
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| 5553. |
What thermodynamics variable is defined by (a) Zeroth law (b) First law? |
| Answer» SOLUTION :INTERNAL ENERGY. | |
| 5554. |
A potential difference of 220 V is applied across a resistance of 440 Omegain an electrical appliance. Calculate the current drawn and heat energy produced in 20 seconds. |
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Answer» Solution :V=220 V R = 440 `Omega` 1=? H =? V= IR `I = (V)/(R)` `=(220)/(440)` `=(1)/(2) = 0.5 A` I =0.5 `H = I^(2) Rt` `=(0.5)^(2) xx440xx20` H =2200 J |
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| 5555. |
What are the advantages and limitations of solar energy? |
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Answer» Solution :ADVANTAGES of solar energy: (i) Solar energy is a RENEWABLE source of energy . (ii) Solar energy does not cause pollution. Limitations of solar energy : (i) Solar energy is difficult to employ. (ii) Solar energy cannot be used at night or on cloudy days. (iii) Solar energy isnot AVAILABLE uniformly during the day TIME and at all the places on the EARTH. |
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| 5556. |
Where are estrogens produced? What is the role of estrogens in the human body? |
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Answer» Solution :(i) Estrogen, the female sex hormone is PRODUCED by the Graafian follicles of the ovary ROLE of estrogen: (a) It brings about the changes that occur during puberty. (b) It initiates the process of oogenesis. (c) It stimulates the maturation of ovarian follicles in the ovary. (d) It promotes the development of SECONDARY sexual characters (breast development and high pitched voice, etc). (ii) Pollination with the help of wind is known as Anemophily (iii) Consequences of deforestation: It gives rise to ecological problems like, (a) Floods (5) Soil erosion (C) Extinction of species (d) LOSS of wild life (e) Desertification(f) Changes in climatic condition |
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| 5557. |
Give more examples for the cases in which the time of action of force is made large to have less force ? |
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Answer» Solution :(i) Fragileitems like glass crockery etc. , are WRAPPED in straw or paperstrips in BOXES for SHIPMENT to AVOID breakage . (ii) CHALKS are packed with husks in between to reduce impact force while transportation . (iii) Automobiles are fittedwith springsand shock absorbersto reduce jerk whilemoving in uneven roads . |
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| 5558. |
(Linnaeus, Dobzhansky, Carl Woese, Theophrastus, Artifical method, Aristotle, Natural system, Traditional system) Time to time, different scientists have tried to classify the animals. Greek philosopher ……………………….was the first to perform the animal classification. Aristotle classified the animals, according to the criteria like body size, habits and habitats. Classification proposed by Aristotle is known as ..................... Besides Aristotle, artificial method of classification was followed by ..................., Pliny, John Ray and .................... Later on, '...........................of classification' was followed. Natural system of classification was based on various other criteria. By the time, system of classification based on evolution was also brought into practice. It was used by ..................... and Meyer. Recently, ........................... has also proposed the animal classification. |
| Answer» Solution :Time to time, different scientists have tried to classify the animals. Greek philosopher ARISTOTLE was the first to perform the animal classification. Aristotle classified the animals, according to the criteria like body size, HABITS and habitats. Classification PROPOSED by Aristotle is known as 'Artificial method'. Besides Aristotle, artificial method of classification was followed by Theophrastus, Pliny, John Ray and Linnaeus. Later on, 'Natural system of classification' was followed. Natural system of classification was based on various other criteria. By the time, system of classification based on evolution was also BROUGHT into practice. It was used by Dobzansky and Meyer. RECENTLY, Carl Woese has also proposed the animal classification. | |
| 5559. |
State the condition when on applying a force, a body has: (a) translational motion, (b) rotational motion |
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Answer» Solution :(a) When the BODY is FREE to MOVE (b) When the body is PIVOTED at a point |
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| 5560. |
List the disadvantages of using fossil fuels. |
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Answer» Solution :Fossil fuels are formcd ROM carbon and BIOMASS which contains hydrogen, carbon, nitrogen and sulphur. When these are burnt, the products are oxides of earbon, water, oxides of nitrogen and oxides of sulphur. Oxides of nitrogen. oxides of sulphur and carhon MONOXIDE are poisonous at high concentration. They MAY lcad to acid rain. Carbon dioxide is a GREENHOUSE gas. When its concentration in the atmosphere increases continuously, leads to intcnce global warming. |
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| 5561. |
Distinguish between the physical properties of metals and nonmetals with respect to the point : Ductillty and malleability |
| Answer» Solution :DUCTILITY and malleability : Metals are DUCTILE and melleable. NONMETALS are not ductile and MALLEABLE. | |
| 5562. |
Addiction is |
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Answer» Solution :(1) In adolescent age group, there is tremendous pressure of peers. This peer-group influence can be at times wrong, if the friends are not good. Instead of following advice of parents, the adolescent grils and boys tend to listen to the wrong ADVICES of their friends. (2) Due to lack of parental supervision, children in their early age start USING tobacco, cigarette, gutka, alcoholic drinks, drugs, etc. This may be due to peer- pressure. (3) The children fall into the trap of addictions either due to peer-group pressure or due to false symbol of HIGH standard living. Something they try to imitate their elders. (4) The addictive substances are hazardous, and they cause long terms effects. Some are temporarily intoxicating substances obtained from the plants. While some of the chemical ingredients in them can permanently damage the human NERVOUS system, muscular system, heart, etc. Some tobacco like substances are CARCINOGENIC in action especially on the mouth and lungs. |
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| 5563. |
What is meant by the term ‘power of accommodation’ of human eye? How does it help a person to see nearby as well as distant objects clearly? |
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Answer» Solution :Power of accommodation of human eye : The ability of eye LENS to adjust its focal length to form the sharp image of the OBJECT at varying distance on the retina is called its power of accommodation. The curvature of eye lens can be changed (i.e. change in its focal length) to some extent by the ciliary muscles. When we are looking at the nearby OBJECTS, the ciliary muscles contract, it increases the thickness of eye lens. The eye lens then BECOMES thicker. As a result, the focal length of eye lens decreases in such a way that the clear sharp image of nearby object is formed on the retina. Thus, the object is seen clearly to us. When we are looking at the distant objects, these muscles are in RELAXED position, the eye lens becomes thinner, focal length of the lens increases. Therefore, the parallel rays coming from the distant object are focussed on the retina and object is seen clearly to us. Thus, the accommodation power of an eye helps a person to see nearby as well as distant objects clearly. |
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| 5564. |
Howdoes the magnitude of magnetic field depend on the current through a conductor ? |
| Answer» Solution :The magnitudeof magnetic FIELD is DIRECTLY proportional to the currentthroughthe CONDUCTOR. | |
| 5565. |
An electric iron of resistance 20 Omega takes a current of 5A. Calculate the heat developed in 30s. |
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Answer» Solution :It is given that RESISTANCE of electric iron `R=20 Omega` current drawn by electric iron I=5A and time t=30s. `THEREFORE` Heat GENERATED `H=I^2RT=(5)^2 times 20 times 30 =15000J` |
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| 5566. |
Where is this mirror used and why ? |
| Answer» SOLUTION :Convex mirrors are used as REAR - view wing mirrors (side mirrors) of vehicles as it forms an erect, diminished image of vehicles behind. The FIELD of vision of a convex mirror is quite wider which MEANS a driver gets a better view of the traffic behind his vehicle. | |
| 5567. |
A body freely falling from rest has a velocity V after it falls through a height H. The distance it has to fall down further for its velocity to become double is |
| Answer» ANSWER :A | |
| 5568. |
Nichrome is an alloy of copper and chromium. |
| Answer» SOLUTION :CORRECT STATEMENT : NICHROME is an alloy of NICKEL and chromium. | |
| 5569. |
Which of the following wires, all made of the same material, has the highest resistance? |
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Answer» L= 100 CM, r = 0.1 cm |
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| 5570. |
The image formed by concave mirror |
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Answer» is ALWAYS REAL |
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| 5571. |
Banks continuously spread the massage on mobile phones about not to disclose any personal information if decomanded by any person. |
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Answer» |
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| 5572. |
Butterfly and Bat. |
Answer» SOLUTION :
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| 5573. |
The refractive index of a dense flint glass is 1.65 and for alcohol it is 1.36 with respect to air. Find the refractive index of dense flint glass with respect to alcohol. |
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Answer» Solution :`""_(AL)mu_(A)=(""_(a)prop_(A))/(""_(a)prop_(al))` `=1.65/1.36=1.21` REFRACTIVE INDEX of dense flint glass with respect to alcohol is 1.21. |
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| 5574. |
Principal focus of a magnifying glass is |
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Answer» a POINT where all the INCIDENT RAYS GO undeviated after passing through the glass. |
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| 5575. |
Physalia , Hyalonema, Euplectella , Spongilla |
| Answer» SOLUTION :PHYSALIA. (Physalia BELONGS to COELENTERATA , all the remaining are poriferans. ) | |
| 5576. |
A vertical glass capillary tube, open at both ends, contains some water. Which of the following shapes may not be taken by the water in the tube ? |
| Answer» Solution :The mercury level does not CHANGE, because there is VACUUM above the mercury level. Hence no pressure is on the mercury. ALSO, the weight of mercury COLUMN must be equal to the aer pressure above the reservoir. Hence there will be no change in the HEIGHT of the mercury column. | |
| 5578. |
Anaerobic process |
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Answer» Takes place in YEAST during fermentation. |
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| 5579. |
How will you convert a given set of resistors so that the equivalent resistance is increased ?Give reason for your answer. |
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Answer» SOLUTION :In SERIES because `R= R_(1)+R_(2)+R_(3)` `=5+10+30=45 Omega` |
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| 5580. |
Choose the correct option. The magnetic field inside a long straight solenoid- carrying current |
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Answer» is zero . |
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| 5581. |
The tendency of pupil in the eye to adjust the opening for light is called………….. . |
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| 5582. |
Explain with an example the inheritance of dihybrid cross.How is it different from monohybrid cross? |
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Answer» Solution :The dihybrid cross involves the INHERITANCE of two PAIRS of contrast characteristics, round - yellow seeds and wrinkled - green seeds. When pea plants having round- yellow seeds cross BRED with pea plant having wrinkled - green seeds, in the FIRST generation `(F_1)` only round yellow seeds were produced No wrinkled - green seeds were obtained. Round yellow COLOUR seeds were dominant and wrinkled-green seeds were recessive. When round-yellow seeds were cross bred by self-pollination, four types of seeds havingdifferent combinations of shape and colour were obtained in `F_2` generation. They were round yellow , round green , wrinkled yellow , wrinkled green The phenotypic ratio in `F_2` generation is 9:3:3:1 i.e. 9-Yellow, round 3-Yellow , wrinkled 3-Green , round 1-Green, wrinkled 
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| 5583. |
What are magnetic field lines ? List any two characteristics of field lines. Draw the pattern of magnetic field lines due to a current carrying circular loop. |
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Answer» Solution : A magnetic field line is the path along which a free north pole tends to move. CHARACTERISTICS : (i) OUTSIDE a magnet, the magnetic field lines are directed from N-pole of magnet TOWARDS S-pole. However, INSIDE a magnet, field lines are directed from S-pole to N-pole. (ii) The relative strength of magnetic field lines is given by degree of closeness of the field lines. More crowded field lines means a stronger field. (iii) No two magnetic field lines can ever intersect each other. Diagram : Magnetic field pattern of a CURRENT carrying circular loop 
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| 5584. |
What is meant by potential difference ? State its SI unit. |
| Answer» SOLUTION :Potential difference : Potentialdifference between two points in an electric circuitcarrying same current is the work DONE to MOVE a unit charge from one point to ANOTHER. SI unit-Volt. | |
| 5586. |
Most of the digestion and absorption of the food takes place in the |
| Answer» Solution :small intestine | |
| 5587. |
Give scientific reasons: b. One can sense colours only in bright light. |
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Answer» Solution :1.The conical cells present on the retina RESPONDS to the colour and GIVE information of the colour of the object. But these cells cannot repond to FAINT light. THEREFORE, we cannot PERCEIVE colours in dark. |
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| 5588. |
Redraw the circuit of Question 1, putting in an ammeter to measure to current through the resistors and a voltmeter to measure the potential difference across the 12 Omega resistor. What would be the readings in the ammeter and the voltmeter? |
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Answer» Solution :The redrawn circuit is shown in fig.12.2 Here AMMETER A has been joined in series of the circuit and voltmeter V is joined in parallel to `12 Omega` resistor. Here total VOLTAGE of BATTERY `V=3 times 2V=6V` Total resistance of series arrangement `R=R_1+R_2+R_3=5+8+12=25 Omega` `therefore` Ammeter READING= Current FLOWING in the circuit `I=V/R=(6V)/(25 Omega)=0.24A` `therefore` Voltmeter reading =Potential difference across `12 Omega` resistor `V.=IR_3=0.24 times 12=2.88V` 
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| 5589. |
An inverted image can be seen in a convex mirror, |
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Answer» under no circumstances |
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| 5591. |
The theory of evolution of species by natural selection was given by |
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Answer» Mendel |
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| 5592. |
Electromagnetic induction means - |
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Answer» Charging of an ELECTRIC conductor. |
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| 5593. |
What is pyrolysis? |
| Answer» SOLUTION :It is a thermo-chemical PROCESS of decomposing ORGANIC MATER at high temperature in the absence of OXYGEN. E.g: Charcoal is obtained by this process. | |
| 5594. |
Figures 9.7 (a), (b), and (c) respectively, indicate the point of focus in case of |
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Answer» the NORMAL EYE, the hypermetropic eye and MYOPIC eye |
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| 5595. |
Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason. |
| Answer» Solution :DUE to change in magnetic FIELD, an electic current is induced in COIL B. | |
| 5596. |
Draw a diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2Omega in series with a combination of two resistor (4Omega each) in parallel and a voltmeter across the parallel combination. Will the potential defference across the 2 Omegaresistor be the sameas that across the parallel combination of 4 Omegaresistors ?Give the reason. |
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Answer» Solution :If `R_p `is the effective resistance of two resistors of `4 Omega` each in PARALLEL,then `1/R_p = 1/4 + 1/4 + 2/4 + 1/2` `:. R_p= 2Omega`  SINCE, the combined parallel resistance is ALSO `2 Omega`, the potential difference across `2 Omega`resistor will be the same as that across the parallel combination of two `4Omega` resistors. |
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| 5597. |
Draw the diagram of a DC generator Then explain as to how the DC current j obtained. |
Answer» Solution :Figureshows the construction of a DC generator.  Working : The axle is rotated with a machine from outside. When the armature coil of the generator rotates in the magnetic FIELD, electric potential difference is PRODUCED in the coil due to electromagnetic induction. This produces a current as shown by the GLOWING of the bulb or by a galvanometer. The direction of the current depends on the sense of ROTATION of the coil. In a DC generator, ONE brush is always in contact with the arm of the coil moving up while the other brush is in contact with the arm of the coil moving down in the magetic field. Hence, the flow of the current in the circuit is always in the same direction and the current flows so long as the coll continues to rotate in the magnetic field. |
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| 5598. |
what is fossilisation? |
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Answer» Solution :The process of FORMATION of fossil in the ROCKS is called fossilization. (ii) Mutation is defined as the sudden heritable change in the nucleotide sequence of DNA in an organism. It is the process by which genetic variation are created which intum brings about changes in the organisms. The organism which undergoes mutation is called a mutant The factor which INDUCE mutations are known as mutagens. Mutagens are of two types (a) Physical mutagens such as X rays, `alpha` `BETA``gamma`.. y rays, UV rays, temperature etc. (b) Chemical mutagens such as mustard gas and nitrous acids. The utilisation of induced mutation in crop improvement is called mutation breeding Achievements of mutation breeding:(a) Sharbati sonora, wheat produced from sonora - 64 by using gamma rays. (b) Atomita 2 rice with saline tolerance and pest resistance, (c) Groundnuts with thick shells. |
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| 5599. |
Specific latent heat of vapourization: |
| Answer» Solution :The AMOUNT of heat energy absorbed at CONSTANT temperature by UNIT mass of a liquid to convert into gaseous phase is CALLED the specific latent heat of VAPOURIZATION. | |
| 5600. |
What is esterification reaction ? |
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Answer» Solution :When an ALCOHOL is treated with carboxylic acid in the presence of `H_2SO_4`sweet smelling COMPOUND is formed which is called ESTER. The reaction is known as ESTERIFICATION reaction. `CH_3COOH + CH_3CH_2COOH to CH_3COOHCH_2CH_3` |
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