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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.
| 1751. |
State one function of pupil. |
| Answer» Solution :Pupil REGULATES and controls the AMOUNT of light ENTERING the EYE. | |
| 1752. |
Cloning. |
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Answer» Solution :(1) Cloning is the MODERN technique in which there is production of replica of any or organ or entire organism is done. (2) There are two types of cloning, viz. (i) Reproductive cloning and (ii) Therapeutic cloning. (3) Reproductive cloning : In reproductive cloning, a clone is produced by fusion of a nucleus of diploid somatic cell with theenucleated ovum of anybody. In the process, the sperm or male gamete is not needed. (4) Therapeutic cloning : This technique is largely used for treatment purpose. STEM cells are derived from the cell formed in laboratory by the union of somatic cell nucleus with the enucleated egg cell. (5) This technique is used for therapy of various diseases. (6) Gene cloning can also be done to form million of copies of same gene. Such genes are used for gene therapy and other purposes. (7) DUE to cloning technique, the inheritance of hereditary diseases can be controlled, continuation of generations can be achieved andcertain characteristic genes can be enhanced. (8) However, for human cloning, there is world-wide opposition due to ETHICAL reasons. |
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| 1753. |
A train moving with a velocity 30ms^(-1) blows a whistle of frequency 516 Hz. Find the pitch of the sound heard by a passenger in another train approaching the first at a speed of15ms^(-1), velocity of sound = 330ms^(-1). |
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Answer» SOLUTION :It both the trains are approaching each other. The apparent frequency `N.=((v+v_(0))/(v-v_(s)))n` `n.=((330+15)/(330-30))xx516` `n.=(345)/(300)xx516=1.15xx516` `n.=593.4Hz` |
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| 1754. |
In the equation of motion, S=ut+1/2 at^(2), s stands for |
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Answer» distance in t SECONDS |
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| 1756. |
A circuit has a fuse of 5A. What is the maximum number of 100 watt (220 V) bulbs which can be safely used in the circuit? |
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Answer» Solution :Suppose x NUMBER of such bulbs can be used. Power of one bulb = 100 WATT Power of x bulbs (P) = 100x watts Potential difference (V) = 220 volts I = 5 ampere We KNOW `P=VI` `rArr 100x=220x5` `THEREFORE x=(220xx5)/(100)=11` bulbs |
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| 1757. |
Statethe ruleof determine thedirection of magnetic field around a current - carrying wire . |
| Answer» SOLUTION :SEE PointNumber 7 under theheading "CHAPTER At A Glance." | |
| 1758. |
The magnification produced by a plane mirror is +1. What does this mean? |
| Answer» SOLUTION :The positive SIGN means image formed by a PLANE MIRROR is virtual and ERECT. Since the magnification is l it means that the size of the image is equal to the size of the object. | |
| 1759. |
A wire of length I and area of aou-aection A wu dnwn into a wire of double Its length by melting orignial resistivity and resistance were rho and R and resistance ? |
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Answer» Solution :We know R `= rho (I)/(A)` When a wire is doubled by melting, its length would become DOUBLE and area of cross-section would be HALVED i.e., length of wire =2I and area of crose section `=(A)/(2)` . Thus we have `R_(1) =(2rhol)/((A)/(2))=(4rhol)/(A)` where `R_(1)` is the NEW resistance . Therefore, the new resistance of the wire is 4 R. As resistivity of a material is the characteristic of a given material, hence it remains unchanged. |
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| 1760. |
The process by which the percentage of U-235 in U-238 is increased, is called |
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Answer» fission |
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| 1761. |
Krebs cycle : |
Answer» Solution :(1) KREBS cycle was proposed by Sir Hans Kreb. This cycle is named after him. It is also called tricarboxylic acid cycle or citric acid cycle.  (2) The acetyl-coenzyme-A molecules enter the mitochondria located in the cytoplasm. (3) They participate in the chemical reactions TAKING place in Krebs cycle. (b) In the cyclic chemical reactions, acetyl-coenzyme-A is completely oxidised. (5) It yields molecules of `CO_(2), H_(2)O, NADH_(2), FADH_(2)` and ATP upon complete oxidation. |
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| 1762. |
Assertion (A): All the appliances in household electric circuit are connected invariably in parallel arrangement. Reason (R ): In parallel combination electricity consumption is less. |
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Answer» Both (A) and (R ) are true and (R ) is correct EXPLANATION of the ASSERTION |
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| 1763. |
(d) Identify and state the type of reproduction represented in the above figure . |
| Answer» Solution :The SPORE FORMATION is ASEXUAL TYPE of reproduction seen in Mucor . | |
| 1764. |
Explain different ways to induce currentin a coil. |
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Answer» Solution :A currentcan be INDUCED in a coil by :[i] relativemotion between a MAGNET and the coil, i.e., by moving a magnettowards or AWAY from the coil or VICE versa [II] changingcurrent in a anothercoil placed nearby |
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| 1765. |
The spectral lines which are having frequences other than the incident ray frequency are called ____________ . |
| Answer» SOLUTION :RAMAN LINES | |
| 1766. |
What is the centre of curvature of a spherical mirror ? |
| Answer» Solution :The centre of the sphere, of which the GIVEN MIRROR FORMS a PART. | |
| 1767. |
What will be the colour of the sky, when it is observed from a place in the absence of any atrnosphere? Why? |
| Answer» SOLUTION :SKY APPEARS DARK in the absence of atmosphere, there would have been no scattering of SUNLIGHT at all. | |
| 1768. |
Explain the term : Heating effect of electric current. |
| Answer» Solution :Heating EFFECT of electric current : When an electric current is passed through a high RESISTANCE wire like nichrome, the resistance wire BECOMES very hot and produces heat. This is CALLED heating effect of electric current. | |
| 1769. |
Can you suggest some changes in your school which would make it environment friendly |
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Answer» Solution :Thechange that wouldmake my SCHOOL environment friendly are : (i) Saving energy by turning of LIGHTS that we are not using . (ii)I will suggets to BUY recycled paper for DECORATION and other purposes instead of materials . (iii)Use writing paper on both the sides . (iv)To grow plant and trees all around the playground. |
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| 1770. |
The most poisonous product formed by incomplete combustion of fossil fuels is |
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Answer» CARBON DIOXIDE. |
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| 1771. |
The sides of a rectangle are (10.5 +- 0.2) cm and ( 5.2 +- 0.1 ) cm. Calculate its perimeter with error limits . |
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Answer» SOLUTION :`P=2(l+b)PM2(Deltal+Deltab)` `=2(10.5+5.2)pm2(0.2+0.1)` `=(3.14pm0.6)CM` |
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| 1772. |
If you float on your back on water, your weight is |
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Answer» zero |
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| 1773. |
What is total internal reflection of light ? What are conditions for total internal reflection ? |
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Answer» |
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| 1774. |
Among the following ………. Is the rarest medium to a denser medium, the angle of refraction is …………. . |
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Answer» water |
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| 1775. |
Which of the following is not a conventional source of energy ? |
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Answer» FOSSIL fuel |
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| 1776. |
A concave mirror of focal length 10 cm can produce a magnified real as well as virtual image of an object placed in front of it. Draw ray diagrams to justify this statement.(b) An object is placed perpendicular to the principal axis of a convex mirror of focal length 10 cm. The distance of the object from the pole of the mirror is 10 cm. Find the position of the image formed. |
Answer» SOLUTION : A CONCAVE mirror of FOCAL length f = 10 cm can produce a magnified real image if an object is placed between F and C (i.e., when 20 cm `gt` u `gt` 10 cm) as shown in Fig. (a). However, the same mirror MAY form a magnified virtual image when object is placed between P and F (i.e., u `LT` 10 cm) as shown in Fig. (b). (b) Here focal length of convex mirror f= + 10 cm, distance of the object from the pole u = -10 cm As per formula `1/v+1/u=1/f` , we have `1/v=1/f-1/u=(1)/(+10)-(1)/(-10)=(1)/(10)+(1)/(10)=1/5` `implies`v=+5 cm Thus, image is formed behind the mirror at 5 cm from the pole of mirror. |
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| 1777. |
(a) Name the gas which is liberated when an acid reacts with a metal ? How will you test the presence of this gas ? (b) Write the chemical equation for the reaction of zinc metal with (i) Hydrochloric acid and (ii) With sodium hydroxide. Write the chemical name of salt obtained in each case. (c) Identify the acid and base for ammonium chloride salt. What would be the nature of this salt ? mention the pH range of this salt. |
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Answer» Solution :(a) `H_(2)` GAS this gas burns with a pop sound. (b) (i) `Zn +2HCl to underset("Zinc chloride")(ZnCl_(2)) +H_(2) uarr` (II) `Zn +2NAOH to underset("Sodium zincate")(Na_(2)ZnO_(2))+H_(2) uarr` (c) Acid is hydrochloric acid (HCl), base is ammonium hydroxide `(NH_(4)OH)`. this salt is acidic salt as it is a salt of strong acid and a weak base, pH of this salt lt7. |
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| 1778. |
The power-voltage rating of an electric appliance is 100 W- 250 V What does it signify? |
| Answer» Solution :The electric appliance CONSUMES a power of 100 W (Le.. an electric energy of 100 J per second) when CONNECTED to a 250 V electric supply. | |
| 1779. |
The least distance of distance vision for a young adult with normal vision about. |
| Answer» Solution :25 cm | |
| 1780. |
The oscillations of a pendulum slow down due to |
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Answer» the FORCE EXERTED by AIR and FRICTION at the SUPPORT |
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| 1781. |
Peer-group influence is stronger in case of eldere. |
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Answer» SOLUTION :FALSE. Peer-group INFLUENCE is strongerin CASE of ADOLESCENTS. |
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| 1782. |
Draw neat labelled diagram of a hypermetropic eye and its correction. |
Answer» SOLUTION :
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| 1783. |
In Figure, a monochromatic point source of light S is viewed by an observer O through a prism P. complete the diagram to show the image formed by the prism and as seen by the observer O. label the image by the letter I. |
Answer» Solution :The completed ray diagram is shown in figure. TWO RAYS SA and SL from the source of light S, are incident on the prism. They are refracted along AB and LM respectively from the first face of the prism. The rays AB and LM again get refracted from the second face of the prism and emerge out of the prism along BC and MN respectively such that they appear to come from a point I. THUS I is the image of the point source S. in other words, the observer O sees the source S raised to the position I. 
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| 1784. |
No matter how far you stand from a mirror, your image appears erect. The mirro is likely to be |
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Answer» plane |
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| 1785. |
Themetalliccharacter of elements_____ in a groupfromtopbottom. |
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Answer» increace |
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| 1786. |
The apparatus which is missing in the above question (3) to perform the experiment is a. Glass marble b. Digital stop clock c. Thermocol ball |
| Answer» Answer :A | |
| 1787. |
An object 20 cm high is placed at a distance of 90 cm from a plane mirror, the size of image will be : |
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Answer» 20 cm |
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| 1788. |
Bat is included in which class ? |
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Answer» Amphibia Explanation : Bat gives birth to YOUNG ONES and they also posses mammary glands. Amphibia, Reptilia and Aves do not show such FEATURES . THEREFORE , bat is included in Mammalia . |
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| 1789. |
Explain the formation of covalent bond taking the example of methane and write the electron dot structure of methane. |
Answer» Solution :Carbon has four valence electrons. To achieve stability, it should follow the octet rule i.e, it should have 8 electrons in its valence shell. Hydrogen has 1 electron in its valence shell and should have 2 electrons in its valence shell to achieve stability. THUS, C shares each of its electrons with ONE hydrogen COVALENTLY to form `CH_4`and achieve a stable form. 
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| 1791. |
Which of the following pairs of physical quantites does not have same dimensional formula ? |
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Answer» Work and torque Tension = FORCE = `[MLT^(–2)]` Surface tension = `("Force")/("length")=[MT^(-2)]` |
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| 1792. |
A cyclist is riding with a speed of 27 kmh^(-1) . As he approaches a circular turn on the road of radius 30 m, he applies brakes and reduces his speed at the constant rate 0.5 ms^(-2). What is the magnitude and direction of the net acceleration of the cyclist on the circular turn ? |
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Answer» Solution :`a_(c)=(v^(2))/(r)=0.7ms^(-2)` `a_(T)=0.5 ms^(-2)` `a=sqrt(2_(C)^(2)+a_(T)^(2))=0.86 ms^(-2)` If `theta` is the angle between the NET acceleration and the VELOCITY of the cyclist, then `theta=tan^(-1)((a_(c))/(a_(T)))=tan^(-1)(1.4)=54^(@)28'` |
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| 1795. |
An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length 15.0 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image ? Find the nature and the size of the image. |
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Answer» Solution :Object-size, h = + 4.0 cm, Object-distance, u = - 25.0 cm, Focal length, f = - 15.0 cm, From mirror FORMULA, `(1)/(v) = (1)/(f) - (1)/(u) = (1)/((-15)) - (1)/((-25)) = - (1)/(15) + (1)/(25)` or `(1)/(v) = (-5 + 3)/(75) = (-2)/(75) or v = - 37.5` cm The screen should be PLACED in front of the mirror at 37.5 cm. Image is real. Also, Magnification, `m = (h.)/(h) = - (v)/(u)` `RARR` Image-size, `h. = - (VH)/(u) = - ((-37.5 cm) (+4.0 cm))/((-25 cm))= - 6.0` cm |
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| 1796. |
How is the resistance of a combination when compared to the resistance of each resistor ? |
| Answer» SOLUTION :LESS than | |
| 1797. |
A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. if the object if nowmoved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again?How will the magnification of the image be affected ? |
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Answer» Solution :OBJECT distance, `u=-12cm` Image distance, `v=24cm` `(1)/(f)=(1)/(v)-(1)/(u)` `=(1)/(24)-(1)/((-12))=(1)/(8)` `f=8cm` If the object is MOVED away from lens, the screen will also be moved towards the lens because otherwise the object distance will increase and hence the image distance will decrease. SINCE, `m=(v)/(u),` the magnification will decrease. |
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| 1798. |
The direction of induced current in an AC generator changes once in each ........ |
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Answer» TWO REVOLUTIONS |
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| 1799. |
Mumbai : Bombay Natural History Society : : Tehri Garhwal : ……. |
| Answer» SOLUTION :CHIPKO CENTRE | |
| 1800. |
Take a small stone. Hold it in your hand. We know that the force gravity due to the earth acts on each and every object. When we were holding the stone in our hand, the stone was experiencing this force, but it was balanced by a force thatwe were applying onn it in the opposite direction. As a result, the stone remained at rest. Once we release the stone from our hands the only force that acts onit is the gravitational force of the earthand the stone falls down under its influence. Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely. Thus the released stone is ina free fall. In free fall, the initial velocity of the object is zero and goes on increasing due to acceleration due to gravity of the earth. During free fall, the frictional force due to air opposes the motion of the object anda buoyant force also acts on the object. Thus, true free fall is posible only in vacuum. For a freely falling object, the velocity on reachign the earth and the time taken for it can be calculated by using Newton's eqwuations of motion. For free fall the initial velocity u=0 and the acceleration a=g. Thus, we can write the equations as v="gt",s=1/2"gt"^(2),v^(2)=2gs For calculating the motion of an object thrown upwards, acceleration is negative, i.e. in a direction opposite ot the velocity and is taken to be -g. The magnitude of g is the same but the velocity of the object decreases due to -ve acceleration. The moon and the artificial satellites are moving only under the influence of the gravitational field of the earth. Thus they are in free fall. What is free fall? |
| Answer» Solution :When an OBJECT falls towards the EARTH under the influence of the Earth's GRAVITY alone it is CALLED FREE fall. | |