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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.
| 1001. |
Compound microscope has 50 to 200 times more magnification power than simple microscope. |
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Answer» |
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| 1002. |
Define the term calorie. How is it related with Joule (the SI unit of heat)? |
| Answer» Solution :One CALORIE is the HEAT required to RAISE the temperature of 1 g of water from `14.5^@C` to `15.5^@C`. 1 Calorie= 4.18 JOULE. | |
| 1003. |
Satellite launch vehicles are used, to place the ............. in their specific orbits. |
| Answer» SOLUTION :SATELLITE | |
| 1004. |
External force is required to maintain the motion of a body moving with uniform velocity. |
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| 1005. |
Dr. Har Govind Khorana was awardedNobel prize for his invention and publication in the jourval Radio carbon. |
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Answer» True |
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| 1006. |
Draw a concept map based on evidences of evolution . Write examples for any one of the evidence . |
Answer» SOLUTION :EVIDENCE of EVOLUTION 
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| 1007. |
Where is the image formed if a person is suffering from (i) myopia and (ii) hypermetropia ? |
| Answer» Solution :The IMAGE is FORMED (i) in FRONT of retina and (ii) behind the retina. | |
| 1008. |
A student did the experiment to find the equivalent resistance of two given resistors, R_(1) and R_(2) first when they are connected in series and next when they are connected in parallel. The two values of the equivalent resistance obtained by him were R_(s) and R_(p) respectively. Compare R_(s)and R_(p). |
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Answer» SOLUTION :In SERIES, the equivalent RESISTANCE `R_(s)=R_(1)+R_(2)` In PARALLEL, the equivalent resistance `(1)/(R_(p))=(1)/(R_(1))+(1)/(R_(2))` `(1)/(R_(p))=(R_(1)+R_(2))/(R_(1)R_(2))` `R_(p)=(R_(1)R_(2))/(R_(1)+R_(2))` Clearly, `R_(s)gtR_(p)`. |
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| 1009. |
What is short sight? How can it be corrected? |
| Answer» SOLUTION :Short sighted person can SEE NEAR objects clearly but not far objects. It can be corrected by using a suitable concave LENS. | |
| 1010. |
Meetu heated sulphur powder in a spatula and collected the gas evolved. (i) Give the equation of the reaction for heating of sulphur. (ii) Write the effect of gas on red litmus solution and blue litmus solution. (iii) Give the type of ore whose heating will evolve the gas. |
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Answer» Solution :(i) `S + underset("(air)")(O_(2)) overset("HEAT")to SO_(2) (g)` (ii) `SO_(2)` gas has no effect on red-litmus PAPER and this gas TURNS BLUE litmus to red, as this gas is acidic oxide. (iii) SULPHIDE ores. |
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| 1011. |
What values does the brother show? |
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Answer» Solution :The BROTHER has (1) CONCERN for his brother (2) KNOWLEDGE of precautionary measures |
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| 1012. |
When a object is placed at 25 cm from a concave lens, a virtual image is produced at a distance 10 cm. Calculate the magnification produced by the lens. Given u=-25cm v=-10cm m=? |
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Answer» SOLUTION :`m=("HEIGHT of the image")/("Height of the object")=(v)/(u)` `=(-10)/(-25)=0.4` MAGNIFICATION `m=0.4` |
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| 1013. |
A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar. |
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| 1014. |
The diagram in Figure shows the combination of two pulleys P_(1) and P_(2) used to lift up a load W. (a) State the kind of pulleys P_(1) and P_(2). (b) State the function of the pulley P_(2). (c) If the free end C of the string moves throughadistance x, by what distance is the load W raised ? (d) What effort E has to be applied at C to just raise the load W=20 kgf ? Neglect both the weight of the pulley P_(1) and friction. |
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Answer» Solution :(a) `P_(1)` is the movable pulley while `P_(2)` is the fixed pulley. (b) The fixed pulley `P_(2)` is used to CHANGE the direction of effort to be APPLIED, from upward direction to DOWNWARD direction. (c) If the free end C of the string moves through a distance x, the load W will rise by a distance x/2. (d) Given W=20kgf, E=? In EQUILIBRIUM, W=2T and E=T `therefore` Effort needed E=`(W)/(2)=(20kgf)/(2)=10kgf`. |
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| 1015. |
If water of mass 60 g and temperature60^(@)Cis mixed with water of mass 60 g and temperature40^(@)C , what will be the maximumtemperature of the mixture ? |
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| 1016. |
Which types of power generation involve maximumnumberof steps of energy conversion? In which type of power generation is the number minimum? |
Answer» Solution :(i) The NUCLEAR power plant has maximum steps for the GENERATION of ELECTRICITY. (ii) The flow chart of nuclear power plant  (iii) The trarisformatiort of energy in an electric generator using wind energy has miniumum NUMBER of steps:  (vi) Stages in electric energy generation using wind energy. 
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| 1017. |
What is colour-blindness ? |
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Answer» Solution : The RETINA of the human eye CONTAINS a large number of light sensitive cells. These cells are of two shapes : (i) rods and (ii) cones. (2) The cone-shaped cells respond to various colours of light when light is bright. (3) Thus, the preception of colour is due to the presene of the cone-shaped cells in the retina. (4) In the retina of some persons, cone-shaped cells RESPONDING to certain specific colours are absent. Hence, these persons are unable to distinguishbetween certain colours , i.e,they are colour-blind. THISDEFECT is known as colour - blindness. |
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| 1018. |
Give an account of the structure of human eye. |
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Answer» Solution :Structure of human eye: i. Human eye is nearly spherical in shape with a diameter of about 2.4 cm. ii. Light enters our eye through the thin membrane known as cornea. The maximum refraction of light rays entering the eye takes PLACE from cornea, iii. Behind the cornea there is a dark fleshy screen called iris. The colour of the iris is different for different people. iv. At the centre of iris, there is a small opening of variable diameter, called pupil. The pupil controls and regulates the amount of light entering the eye. v. For bright light, the pupil contracts, while in case of insufficient light, the pupil widens. vi. There is a transparent biconvex crystalline lens located just behind the pupil also called as eye lens. This lens provides fine adjustment of focal LENGTH. For a normal eye in relaxed position, focal length of eye lens is about 2 cm. vii. By adjusting focal length of eye lens, real and inverted image of an object is formed on the retina.  viii. Retina is a delicate membrane consisting of large number of light sensitive cells. When light falls on the retina, the cells get activated and produce electrical signals. ix. These signals are sent to BRAIN through optic nerve. x. Ciliary muscles surround the lens. These muscles hold the eye lens in place. When the muscles relax, they increase the focal length of the lens, allowing the eye to see the objects that are FAR away. To see closer objects clearly ciliary muscles must contract in order to decrease the focal length of the lens. xi. For nonnal human eye, the minimum distance of distinct vision is about 25 cm. |
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| 1019. |
State the principle of an electric generator |
| Answer» Solution :An ELECTRIC generator is based on the PRINCIPLE of electromagentic induction. When a rectangular coil is rotated in a uniform magnetic field, an INDUCED voltage is generated between the ends of the coil. | |
| 1020. |
Which of the following property of a proton can change while it moves freely in a magnetic field ? (There may be more than one correct answer) |
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Answer» Mass |
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| 1021. |
………. isotope is used to detect the presence of block in blood vessels and also used for the effective functioning of heart |
| Answer» SOLUTION :`NA^(24)`- RADIO SODIUM | |
| 1022. |
A convex lens forms a virtual image of an object placed ………… . |
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Answer» at INFINITY |
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| 1023. |
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. The IMAGE in front of the mirror which can be obtained on a screen is called a real image. ii. The image which is behind the mirror and thus cannot be obtained on a screen is called a VIRTUAL image. iii. A virtual image cannot be obtained on a screen , whereas, a real image can be observed on screen. In this way, one can find out WHETHER the image formed is real or virtual by observing the screen. |
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| 1024. |
A student is studying the properties of acetic acid. List two physical properties of acetic acid he observe. What happens when he adds a pinch of sodium hydrogen carbonate to this acid? Write any two observations. |
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Answer» Solution :Physical properties of acetic ACID observed are: (i) Acetic acid is a colourless liquid. (ii) It is miscible or soluble liquid. On adding apinch of sodium hydrogen carbonate, (i) brisk EFFERVESCENCE is observed. (ii) there is EVOLUTION of a colourless and odourless GAS. |
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| 1025. |
List the hormones of the anterior lobe of the pituitary gland? |
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Answer» Solution :Mention the tissues on which they exert their effect. Vasopressin and Oxytocin are the hormones secreted by the posterior lobe of the pituitary gland. In kidney tubules, the vasopressin hormone INCREASES the reabsorption of water. Its deficiency caused Diabetes insipidus. Oxytocin helps in the contraction of the smooth muscles of uterus at the TIME of child birth and milk EJECTION from the mammary gland after child birth .E-wastes are generally called as electronic wastes, INCLUDES the spoiled, outdated, non-repairable electrical and electronic devices. The process of Fusion of male gamete (sperm) and female gamete (ovum) is known as fertilization. It results in the FORMATION of Zyote |
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| 1026. |
List any two criteria for selecting a good fuel. |
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Answer» SOLUTION :Criteria for SELECTING a GOOD fuel: Does a large amountof work per unit volume or mass easily accessible Easy to store and transport [any two ] |
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| 1027. |
Complete the following : Concept diagram using factors harming the social health and based on it , answer the question : Tobacco products can be included in which of those factors ? |
Answer» SOLUTION : TOBACCO PRODUCTS are INCLUDED under ADDICTION . |
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| 1028. |
Fill suitably Generator rarrArmature->Induced e.m.f Microphonerarr _____rarrInduced e.m.f. |
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| 1029. |
What is energy ? |
| Answer» SOLUTION :The capacity of a BODY to PERFORM work is CALLED its ENERGY. | |
| 1030. |
Complete the following : Concept diagram using factors harming the social health and based on it , answer the question : How the tobacoo products are harming the social health ? |
Answer» SOLUTION : Tobacco is carcinogenic PRODUCT .By its consumption personal and social health is AFFECTED ona large SCALE . Spitting tobacco anywhere is also common practice among tobacco chewers . This too affects public hygiene and cleanliness . |
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| 1031. |
In industries , ____________ are used as tracers to detect any manufacturing defects such as cracks and leaks. |
| Answer» SOLUTION :RADIOACTIVE ISOTOPES | |
| 1032. |
Disasters can be properly classified into three categories, viz. natural disasters, technological disasters and man-made disasters. The forces that caues natural disasters cannot be controlled. Moreover they are becoming more frequent in the current years due to phenomena of climate change. On and offincidences of cyclones, cloud bursting, floods, etc. are creating havoc in the lives of people. Technological disasters are due to improper and callous behaviour a the differenet processe carried out in technical establishments. Man-made disasters are conficts arising due to different religions, regions and terrorism. Which types of disasters can be controlled in order to lead happy, peaceful and secured life? How? |
| Answer» Solution :We have to control MANMADE disasters such as WARS, RIOTS, terroirsm, ETC. by having peaceful negotiations respect for each human being and feeling of brotherhood among all. | |
| 1033. |
When a sound wave travels through air, the air particles |
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Answer» a)VIBRATE ALONG the direction of the wave motion |
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| 1034. |
If one of the resistor in a parallel circuit is removed, the total resistance will be___________. |
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Answer» Doubled |
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| 1035. |
What is a solenoid? Draw the pattern of magnetic field lines of (i) a current carrying solenoid and (ii) a bor magnet. List two distinguishing features between the two fields. |
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Answer» Solution :A solenoid is a LONG cylindrical coil with many close turns of insulated copper wire wrapped in the shapw of a CYLINDER. (i) MAGNETIC field lines of current carrying solenoid:  (ii) Magnetic fiedl lines of a bar magnet. See Q. 21(a), 2018 (Comptt.). Distinguishing features between the two fields: (a) The strength of magnetic field DUE to SLOENOID can be changed while the magnetic field strength due to bar magnet cannot be changed. Solenoid produses magnetic field as long as current flows in its coils while bar magnet produces a permanent magnetic field. |
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| 1036. |
What are the divisionsof the body in molluscans ? |
| Answer» SOLUTION :Molluscan animal's BODY is divided into three parts , VIZ. HEAD , footand visceral mass. | |
| 1037. |
Derivative expressions for the kinetic energy and potential energy of a simple harmonic oscillator. |
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Answer» Solution :Expression for K.E of a SIMPLE harmonic oscillator: The displacement of the body in S.H.M., `X=Asinomegat` where A = amplitude, `omegat=` Angular displacement. Velocity at any instant, `y=dy/dx=Aomegacosomegat` `therefore K.E=1/2mv^(2)=1/2mA^(2)omega^(2)cos^(2)omegat` `therefore K.E=(1)/(2)mA^(2)omega^(2)(1-sin^(2)omegat)` `=(1)/(2)mA^(2)omega^(2)[1-(x^(2))/(A^(2))]` `=(1)/(2)MOMEGA^(2)[A^(2)-x^(2)]` `therefore K.E =(1)/(2)momega^(2)[A^(2)-x^(2)]` At mean position velocity is maximum and displacement `x=0` `therefore K.E_(max)=(1)/(2)mA^(2)omega^(2)` Expression for P.E of simple harmonic oscillator: Let a body of mass 'm' is in S.H.M with an amplitude A.  Let O is the mean position. EQUATION of a body inS.H.M is given by `x=Asinomegat` For body in S.H.M acceleration, `a=-omega^(2)Y` Force, `F=ma=-momega^(2)x` `therefore` Restoring force, `F=momega^(2)x` Potential energy of the body at any point say 'x': Let the body is displaced through a small DISTANCE dx Work done, `dW=F.dx=P.E.` This work done. `therefore P.E=momega^(2)x.dx`(where x is its displacement) Total work done, `W=intdW=int_(0)^(x)momega^(2)x.dx` `rArr` Work done, `W=(momega^(2)x^(2))/(2)`. This work is stored as potential enerygy. `therefore` P.E. at any point `=1/2momega^(2)x^(2)` |
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| 1038. |
Disasters can be properly classified into three categories, viz. natural disasters, technological disasters and man-made disasters. The forces that caues natural disasters cannot be controlled. Moreover they are becoming more frequent in the current years due to phenomena of climate change. On and offincidences of cyclones, cloud bursting, floods, etc. are creating havoc in the lives of people. Technological disasters are due to improper and callous behaviour a the differenet processe carried out in technical establishments. Man-made disasters are conficts arising due to different religions, regions and terrorism. What are three broad areas of disasters? |
| Answer» SOLUTION :Natural disasters, TECHNOLOGICAL disasters and manmade disasters are THREE broad AREAS of disasters. | |
| 1039. |
The inner surface of solar cooker is coated with black paint to |
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Answer» ABSORB more heat |
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| 1040. |
Disasters can be properly classified into three categories, viz. natural disasters, technological disasters and man-made disasters. The forces that caues natural disasters cannot be controlled. Moreover they are becoming more frequent in the current years due to phenomena of climate change. On and offincidences of cyclones, cloud bursting, floods, etc. are creating havoc in the lives of people. Technological disasters are due to improper and callous behaviour a the differenet processe carried out in technical establishments. Man-made disasters are conficts arising due to different religions, regions and terrorism. Which disasters cannot be controlled? Why? |
| Answer» Solution :Natural DISASTERS cannot be controlled as they are due to natural PHENOMENA BEYOND the human POWER to STOP them. | |
| 1041. |
solubilityis theamountof solutedissolvedin ______ gof solvent . |
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Answer» 10 g |
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| 1042. |
Disasters can be properly classified into three categories, viz. natural disasters, technological disasters and man-made disasters. The forces that caues natural disasters cannot be controlled. Moreover they are becoming more frequent in the current years due to phenomena of climate change. On and offincidences of cyclones, cloud bursting, floods, etc. are creating havoc in the lives of people. Technological disasters are due to improper and callous behaviour a the differenet processe carried out in technical establishments. Man-made disasters are conficts arising due to different religions, regions and terrorism. Which type of disasters were very common in Western Maharashtra in recent times? Why? |
| Answer» SOLUTION :Cloud bursting an floods were very COMMON in Western MAHARASHTRA CAUSED DUE to climate change. | |
| 1043. |
Explain the various cases of apparent weight of a person in a moving lift. |
Answer» SOLUTION :
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| 1044. |
Disasters can be properly classified into three categories, viz. natural disasters, technological disasters and man-made disasters. The forces that caues natural disasters cannot be controlled. Moreover they are becoming more frequent in the current years due to phenomena of climate change. On and offincidences of cyclones, cloud bursting, floods, etc. are creating havoc in the lives of people. Technological disasters are due to improper and callous behaviour a the differenet processe carried out in technical establishments. Man-made disasters are conficts arising due to different religions, regions and terrorism. Given any one example of technological disaster that shook the entire India. |
| Answer» Solution :Bhopal GAS tragedy that occurred in 1984 was a worst DISASTER that SHOOK the entire India. | |
| 1045. |
Match V {:("1. Co-60", "(a) Age of fossile"), ("2. I-131", "(b) Functions of heart"), (3. "Na-24", "(c) Leukemia"),(4. "C-14" , "(d)thyroid disease"):} |
| Answer» Solution :1. (c) Leukemia2.(0) Thyroid disease3. (b) FUNCTION of HEART4(a) Age of FOSSIL | |
| 1046. |
To study the dependence of current (I) on the potential difference (V) across a resistor, two students used the two sets ups shown in figs (A) and (B) respectively. They kept the contact J in four different positions, marked (a), (b), (c), (d) in the two figures. For the two students, their Ammeter and Voltmeter readings will be minimum when the contact J is in the position : |
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Answer» (a) in both the SET UPS |
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| 1047. |
What happens to a ray of light when it travels from one medium to another having equal refractive index ? |
| Answer» Solution :The light RAY travels STRAIGHT WITHOUT any BENDING. | |
| 1048. |
Describe the formation of a rainbow in the sky with the help of a diagram. |
Answer» Solution :Immediately after rain, the ater DROPLETS in the atmosphere act like SMALL prisms and they refract, dispere, and internally reflect the sunlight FALLING on them as shown in the figure. Thus, a BEAUTIFUL SPECTRUM of sunlight is seen in the sky known as rainbow. An observer standing with his back towards the sun observes the rainbow in the form of concentric circular arcs of different colours in the horizon. 
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| 1049. |
The chemical formula for plaster of Paris is : |
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Answer» `CaSO_(4).2H_2O` |
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| 1050. |
Mrs vincent grade 5 teacher found that her students did not draw when she drew on the board. |
| Answer» Solution :Every time she had to turn towards them to see whether they DRAW and label the diagrams. John, one of her STUDENTS fixed two BIG convex MIRRORS at the two sides of the black board. With this Mrs. Vincent was able to draw and also supervise her students through the MIRROR. All the students did their work properly. | |