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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.
| 5701. |
Which type of lens has a negative power ? |
| Answer» Solution :A CONCAVE (diverging) LENS has a negative POWER. | |
| 5702. |
Describe some experiment to show that the magnetic field is associated with an electric current. |
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| 5703. |
During a thunderstorm if you notice a 3 second delay between the flash of lightning and sound of thunder. What is the approximae distance of thunderstrom from you? |
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Answer» Solution :Time taken to REACH the SOUND = 3s , Speed of sound in air= 343.2 m/sec. DISTANCE of thunerstrom `= 343.2 XX 3 = 1029.6` m. |
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| 5704. |
List the sign conventions for reflection of light by spherical mirrors. Draw a diagram and apply these conventions in the determination of focal length of a spherical mirror which forms a three times magnified real image of an object placed 16 cm in front of it. |
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Answer» Solution :For new Cartesian sign convention for mirrors, see Point Number 15 under the heading "Chapter At A Glance". As per question and using the sign convention followed u = - 16 cm and magnification m = - 3 (because image is REAL). `therefore""m = - (v)/(u) = - (3) rArr v = 3u = 3 xx (-16) = - 48` cm `therefore""(1)/(f) = (1)/(v) + (1)/(u)` `= (1)/((-48)) + (1)/((-16)) = (1 + 3)/((-48)) = - (4)/(48) = - (1)/(12)` `rArr""f = - 12` cm The -ve sign of .f. shows that the MIRROR is a concave mirror. The ray diagram is shown in Figure. 
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| 5705. |
List three methods of producing magnetic fields. |
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Answer» Solution :Three methods of producing magnetic field are as follows: (i) Magnetic field can be produced by placing a permanent bar magnet or a HORSE shoe magnet at the place, where magnetic field is REQUIRED. (ii) Magnetic field is produced AROUND a current-carrying straight conductor or a current-carrying circular coil. (iii) A very good method to produce magnetic field is due to FLOW of current in a solenoid. |
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| 5706. |
Ampere-metre is used to represent |
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Answer» MAGNETIC field |
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| 5707. |
What is an electric motor ? |
| Answer» SOLUTION :It is a device CONVERTS ELECTRIC ENERGY into mechanical energy. | |
| 5708. |
Which the help of suitable diagrams, explain the five stages of prophase -I of meiosis. |
Answer» Solution :  Prophase -I: Prophase-I of meiosis is much longer phase of the meiosis. It is subdivided into 5 substages, namely LEPTOTENE, zygotene, pachytene, diplotene, and diakinesis. 1. Leptotene: INITIALLY the chromosomes start condensation and they become compact during leptotene. 2. Zygotene: In zytogene, homologous chromosomes start pairing. This pairing is called synapsis. The structure called synaptonemal bivalent or tetrad. 3. Pachytene: During pachytene stage, crossing over of non-sister chromatids of homologous chromosomes takes place. Genetic recombination is produced dur to such exchange. The homologous chromosomes still remain paired together at the sites of crossing over. 4. Diplotene: During diplotene, synaptonemal complex disolves and the homologous chromosomes o the bivalents separate except at teh point of crossin over. Thus, it LOOKS like K-shaped structures called the chiasmata. 5. Diakinesis: The last phase of prophase is for termination oif chiasmataa. The spindle fibres originate, and the cross over homologouschromosomes are noe separated. The nucleolus DISAPPEARS, and the NUCLEAR envelope breaks down. |
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| 5709. |
The hormone which has positive effect on apical dominance is |
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Answer» cytokinin |
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| 5710. |
Boltzmann's constant k is equal to the product of universal gas constant R and Avogadro number (N_(A)) |
| Answer» SOLUTION :`K_(B)=(R)/(N_(A))` | |
| 5711. |
Tigers from Sunderbans and Rhinos from Manas are under threat. |
| Answer» Solution :(1) Manas is in the area of Assam where there are many dams and indiscriminate use of water. (2)This areais also flood affected. Therefore, rhinos are under threat. (3)In SUNDERBANS, there are also problems such as deforestation, dams, excessive fishing, and DUG out trenches.(4) All of these cause DANGERS to the tiger population. | |
| 5712. |
The ratio of increase in length of the body per degree rise in temperature to its units length is called _________. |
| Answer» SOLUTION :COEFFICIENT of LINEAR EXPANSION | |
| 5713. |
Keeping the potential difference constant, the resistance of an electric circuit is doubled. State the change in the reading of an ammeter connected in the circuit. |
| Answer» SOLUTION :The reading of ammeter (i.e., current flowing in the circuit ) is REDUCED to ONE half of its PREVIOUS value. | |
| 5714. |
The fusion reactions occur at |
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Answer» LOW pressures |
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| 5715. |
Why are copper and aluminium wires usually employed for electricity transmission? Explain. |
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Answer» Solution :Because - COPPER and aluminium have low electric resistivity. so they conduct electric CURRENT without heavy heat losses (due to which they are known as very good CONDUCTORS of electricity). Copper and aluminium are much more easily and CHEAPLY available as COMPARED to metal like silver. They can be easily made into wires due to high malleability. Therefore. copper and aluminium wires are usually employed for electricity transmission. |
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| 5716. |
Assertion (A): Two bulbs A and B are rated as 100W,220V, and 40W,220V respectively. Resistance of bulb A is more than that of bulb B. Reason (R ): For a given potential difference the power consumed in a resistor is inversely proportional to its resistance. |
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Answer» Both (A) and (R ) are true and (R ) is correct explanation of the assertion |
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| 5717. |
The magnification produced by a concave mirror |
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Answer» is ALWAYS more than one |
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| 5718. |
Reflection : Velocity remains same : : _____ : Velocity changes |
| Answer» Solution :REFRACTION In reflection, light travels in same medium hence VELOCITY REMAINS same. In refraction, light travels in DIFFERENT medium hence velocity changes. | |
| 5719. |
Two identical-looking bars A and B are given, one of which is definitelymagnetised . How would oneascertain whether or not both are magnetised? If only one is magnetised, how does one ascertain which one ? |
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Answer» Solution :Different ends of both the bars are brought closer. If both A and B are MAGNETS, repulsion should occur at least once. If one of them is a magnet, Only ATTRACTION OCCURS in all the cases. To FIND out which one is magnetized, keep bar A on a table and move the tip of bar B along the length of A . If it sticks to A in the sameway no matter where we touch the tip, bar B is themagnet. If it sticks less at the centre bar A is the magnet[because magnets are stronger at the poles] . |
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| 5720. |
Calculate the resistance of a 1 Km long copper wire of area of cross section 2 xx 10^(-2) cm^(2).The resistivity of copper is 1.623 xx 10^(-8)ohm-meter. |
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Answer» Solution :`R= RHO (I)/(A)` `=(1.623xx10^(-8)xx1000)/(2XX10^(-2)xx10^(-4)m^(2))` `=0.81xx10Omega= 8.1 OMEGA` . |
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| 5721. |
Draw the diagram of the apparatus used in electrolytic refining of copper and label the electrode where pure copper is deposited. |
Answer» SOLUTION :
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| 5722. |
Animals attached to substratum are called ………… animals . |
| Answer» Solution :ANIMALS attached to SUBSTRATUM are CALLED sedentary animals . | |
| 5724. |
Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop. |
Answer» SOLUTION :The magnetic FIELD lines have been shown in Fig. 13.4. As per right-hand RULE, we find that inside the loop, the magnetic field lines are directed perpendicular to the PLANE of loop in the inward DIRECTION. Outside the loop magnetic field lines are directed out Fig. 13.4 of the plane of loop.
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| 5725. |
Change in linear momentum can be produced by applyinglarger force for a longer period of time. |
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Answer» |
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| 5726. |
On account of atmospheric refraction |
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Answer» SUN appears 4 minutes before actual sunrise. |
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| 5727. |
To find the resultant resistance of two resistors when connected in series, a student arranged the various components according to the circuit shown alongside : The student, however, did not succeed in his objective. Which of the following mistake has been made by the student in setting up the circuit ? |
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Answer» POSITION of VOLTMETER is wrong |
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| 5728. |
Explain the following reaction with thehelp of balanced equation: Electrolysis ofalumina is done |
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Answer» Solution :During electrolysis of alumina, aluminium is deposided at the cathode, MOLTEN aluminium being heavier than the electrolyte, is callected at the bottom of the tank. OXYGEN gas is liberated at the anode. Anode reaction: ` 2O^(--)rarr O_2+4e^(-)` (Oxidation) Cathode raction : `AL^3+3e^(-)rarr Al_(l)` (Reduciton) |
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| 5729. |
The molecular formula of three fatty acids A, B and C present in oil or fat is C_12 H_29COOH, C_15H_29COOH and C_16H_29COOHWhich of these is derived from i) Alkane ii) Alkene and iii) Alkyne? Which of them becomes rancid earlier? How can we increase its shelf life? |
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Answer» SOLUTION :Derived from i) ALKANE - `C_2H_29COOH` II) Alkene - `C_15H_29COOH` iii) Alkyne - `C_16H_29COOH ` `C_16H_29COOH ` is unsaturated undergoes rancidity EARLIER. By hydrogenation we can increase shelf life. |
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| 5730. |
Fuse wire, Bad conductor, Rubber gloves, Generator. |
| Answer» SOLUTION :GENERATOR. It converts MECHANICAL energy into ELECTRIC energy, the REMAINING three do not. | |
| 5731. |
(a) What is a nuclear reactor ? What is the fuel used in a nuclear reactor ? (b) With the help of a labelled diagram, describe the working of a nuclear power plant.(c ) How is the working nuclear reactor of a power plant shut down in an emergency ?(d) Name five places in India where nuclear power plants are located. |
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| 5732. |
A ray of light is normally incident on one face of an equilateral glass prism. Answer the following : (a) What is the angle of incidence on the first face of the prism? (b) What is the angle of refraction from the first face of the prism ? (c) What will be the angle of incidence at the second face of the prism ? (d) Will the light ray suffer minimum deviation by the prism ? |
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Answer» (B) `0^(@)` (III) `60^(@)` (iv) No. |
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| 5733. |
Name the physical quantity which is same in all the resistors when they are connected in se.ries. |
| Answer» SOLUTION :ELECTRIC CURRENT. | |
| 5734. |
Kilowatt hour is the unit of |
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Answer» RESISTIVITY |
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| 5735. |
Which of the following correctly describes the magnetic field near a long straight wire ? |
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Answer» The field NEAR a LONG straight WIRE is pependicular to the wire. |
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| 5736. |
How are we able to see nearby and also the distant objects clearly ? |
| Answer» SOLUTION :Human eye can SEE CLEARLY the nearby objects as well as the distant objects by changing the focal length//power of the eye lens with the HELP of CILIARY muscles. This property is the power of accommodation of the eyes. | |
| 5737. |
Due to short circuit, efferctive resistance in the circuit becomes. . . . . . . . .. |
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Answer» large |
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| 5738. |
What are hot spots? |
| Answer» Solution :Due to geothermals changes molten rock FORM in DEEPER hot region of the earths crust are pushed upwards which GET collected at some depth below the earth surface. These REGIONS or PLACES are called hotspots. | |
| 5739. |
Analyse the observation table which shows variation of image distance [v] with object distance [u] in the case of a convex lens. Answer the questions that follow without doing any calculations.{:("Sl.No","Object distance","Image distance"),(,"u [cm]","v [cm]"),(1,-90,+18),(2,-60,+20),(3,-30,+30),(4,-20,+60),(5,-18,+90),(6,-10,+100):}(a) What is the focal length of the convex lens ? Given reasons to support your answer.(b) Write the Sl.No of the observation which is not correct. How did you arrive at this conciusion ?(c ) Use an appropriate scale to draw the ray diagram for the observation at Sl. No 4 and find the approximate value of magnification. |
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Answer» SOLUTION :(a) When `u=-30 cm , v=+30 cm`. This indicates that the OBJECT is at C1 [which is `2F_(1)`] R = 2f, 30 = 2f, f = 15 cm Focal length of the convex lens is + 15 cm. (b) If Object distance `u=-10 cm`, it means the object is placed between the optic centre and focus, a virtual erect image formed in this case on the same side as the object. Therefore v should be NEGATIVE according to Cartesian sign convention ie., `v=-100 cm` and not `v=+100` cm as mentioned in the table. Therefore SI. No 6 is incorrect. (c ) SI. No 4 `u=-20 cm , v=+60 cm F_(1)=-15 cm 2F_(1)=-30 cm` The object is between `F_(1)` and `2F_(1)`, an enlarged real and inverted image is formed BEYOND 2F,  Magnification `=m = (v)/(u)=((+60))/((-20))=-3` |
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| 5740. |
For a person with hypermeteropia, the near point has moved to 1.5 m. calculate the focal length of the correction lens in order to make his eyes normal. |
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Answer» SOLUTION :GIVEN that , d= 1.5m, D = 25 cm =0.25m (For ANORMAL EYE The focal length of the correction lens is `f=(d xxD)/(d-D)` `=(1.5xx0.25)/(1.5-0.25)` `=(0.375)/(1.25)=0.3m` |
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| 5741. |
A compass needle just above a wire in which electrons are moving towards cast, will point |
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Answer» east |
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| 5742. |
Linear expansion is related to |
| Answer» SOLUTION :Linear expansion is directly PROPORTION to original length of rod and RISE in temperature | |
| 5743. |
Explain how the specific heat capacity of a solid can be determined ( measured ) by the method of mixture. |
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Answer» Solution :A hot solid is put in water in a calorimeter. The mixutre is stirred continuously and the maximum temperature of the mixture is measured with a thermometer. HEAT exchange between the hot solid, water and calorimeter RESULTS in all bodies attaining the same temperature after some time. HENCE, according to the principle of heat exchange, heat lost by the solid= heat gained by the water in the calorimeter `+` heatgained by the calorimeter. Now, heat lost by the solid ( Q ) = mass of the solid `xx` its specific heat capacity `xx` decrease in its temperature , heat gained capacity `xx` decrease in tistemperature , heat gained by the water `(Q_(1)) =` mass of the water `xx` its specific heat capacity `xx` increases in its temperature and heatgained bythe calorimeter `(Q_(2)) `= mass of the calorimeter `xx` its specific heat capacity `xx` increase in its temperature. Heat lost by the hot object = heatgained by thecalorimeter `+` heat gained by the water . `Q= Q_(2) + Q_(1)`. Using this equation, the specificheat capacity of the solid can be determined ( measured ) when the other quantities are KNOWN. |
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| 5744. |
Read the paragraph given below and answer the questions : The substances formed by specific chemical bond between fatty acids and alcohol are called lipids. Digestion of lipids consumed by us is nothing but their conversion into fatty acids and alcohol. Fatty acids are absorbed and distributed everywhere within the body. From those fatty acids, different cells produce various substances necessary to themselves. Ex the molecules called phospholipids which are essential for producing plasma membrane are formed from fatty acids. Besides, fatty acids are used for producing hormones like progesterone, estrogen, testosterone, aldosterone, etc. and the covering around the axons of nerve cells. We get 9 Kcal of energy per gram of lipids. Excess of lipids are stored in adipose connective tissue in the body. What happens to fats that are eaten in excess? |
| Answer» Solution :WHEM excess of fats are EATEN, they are STORED in ADIPOSE connective tissue. | |
| 5745. |
The human eye formsthe image of an object at its : |
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Answer» Cornea |
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| 5746. |
When electric current I flow through a straightwireof lengthI placed in a magnetic field , a magneticforceof 1N acts on it . If magneitudeof theelectriccurrentis halved and the magneticfield is doubled , whatwill be the magnetic forceacting on the wire ? |
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Answer» 0.5 N |
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| 5747. |
Read the paragraph given below and answer the questions : The substances formed by specific chemical bond between fatty acids and alcohol are called lipids. Digestion of lipids consumed by us is nothing but their conversion into fatty acids and alcohol. Fatty acids are absorbed and distributed everywhere within the body. From those fatty acids, different cells produce various substances necessary to themselves. Ex the molecules called phospholipids which are essential for producing plasma membrane are formed from fatty acids. Besides, fatty acids are used for producing hormones like progesterone, estrogen, testosterone, aldosterone, etc. and the covering around the axons of nerve cells. We get 9 Kcal of energy per gram of lipids. Excess of lipids are stored in adipose connective tissue in the body. Which hormones regulating reproductive fnuctions are produced from fatty acids? |
| Answer» Solution :PROGESTERONE, estrogen and testosterone are the REPRODUCTIVE HORMONES produced from FATTY acids. | |
| 5748. |
Two bulbs of 100W and 40W are connected in series. The current through the 100W bulb is 1A. The current through the 40W bulb will be: |
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Answer» `0.4A` |
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| 5749. |
Read the paragraph given below and answer the questions : The substances formed by specific chemical bond between fatty acids and alcohol are called lipids. Digestion of lipids consumed by us is nothing but their conversion into fatty acids and alcohol. Fatty acids are absorbed and distributed everywhere within the body. From those fatty acids, different cells produce various substances necessary to themselves. Ex the molecules called phospholipids which are essential for producing plasma membrane are formed from fatty acids. Besides, fatty acids are used for producing hormones like progesterone, estrogen, testosterone, aldosterone, etc. and the covering around the axons of nerve cells. We get 9 Kcal of energy per gram of lipids. Excess of lipids are stored in adipose connective tissue in the body. How is plasma membrane of the cells formed ? |
| Answer» Solution :The DIGESTED fats are absorbed in the form of FATTY acids. These are converted back to PHOSPHOLIPIDS from which plasma MEMBRANE of CELLS is formed. | |
| 5750. |
Use the data in Table on page 23 of this book to answer the following: (a) Which among iron and mercury is a better conductor? (b) Which material is the best conductor? |
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Answer» Solution :(a) The electrical resistivity of iron is `10.0 xx 10^(-8) OMEGAM` WHEREAS that of mercury is `94.0 xx 10^(-8) Omegam`. Since the resistivity of iron is less than that of mercury, therefore, iron is a better conductor than mercury. (B) Silver metal has the LOWEST electrical resistivity (of `1.60 xx 10^(-8) Omega m)`, therefore, silver metal is the best conductor of electricity. |
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