InterviewSolution
Saved Bookmarks
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.
| 1801. |
One calorie is the amount of heat energy required to raise the temperature of __________ of water through ___________. |
| Answer» SOLUTION :`1 "GRAM", 1^(@)C` | |
| 1802. |
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 on 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 on it 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 and buoyant force also acts on the object. Thus, true free fall is possible only in vacuum. For a freely falling object, the velocity on reaching the earth and the time taken for it can be calculated by using Newton's equations 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 to 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 the initial velocity and what is the effect of gravitational acceleration on the object in free fall? |
| Answer» SOLUTION :In free FALL, the intial velocity of an object is ZERO and is the TIME prpgress, velocity INCREASES due to unifrom gravitational acceleration. | |
| 1803. |
In case of both, convex mirror and concave mirror, any line passing through centre of curvature of the mirror is normal to the mirror. A ray of light falling normally on the mirror, retraces its path on reflection. This is because for a normaly ray, angle of incidence, anglei=0^@. As angle of reflection is equal to angle of incidence, i.e., angle r=angle i , therefore, angle r=0^@. That is why the path of the ray normally on the mirror is retraced. Read the above passage and answer the following questions : (i) Do the rays passing through principal focus of mirror fall normally on the mirror. (ii) Which is closer to the mirror, principal focus or centre of curvature of the mirror ? (iii) What values of life do you learn from this concept? |
|
Answer» Solution :(i) No, the rays PASSING through principal focus of mirror do not fall NORMALLY on the mirror. (ii) Principal focus F of the mirror is closer to the pole P of the mirror, compared to the centre of curvature, C. Infact, `PF=1/2PC`. (iii) This concept implies that one should preferably stay along normal to avoid deflections. Staying in normal mode will save you from LARGE scale FLUCTUATIONS. They say, too much of everything is bad. So EAT normal, sleep normal, play normal, study normal, talk normal, listen normal and so on. Prefer not to do anything abnormally. |
|
| 1804. |
CuCl_(2) + 2KI to CuI_(2) + 2KCl: Double displacement :: Zn + 2HCl to ZnCl_(2) + H_(2) : _________ |
| Answer» SOLUTION :DISPLACEMENT REACTION | |
| 1805. |
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 toi 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. Which force acts on the stone when held in the hand? |
| Answer» Solution :GRAVITATIONAL force in DOWNWARD direction and reaction force of hand in UPWARD direction. | |
| 1806. |
If 240 J heat is generated in a conductor of resistance 50 Omega when 0.2 A current is passed through it, then for how long is the current flowing through the conductor? |
|
Answer» CURRENT (I) = 0.2 A To find: `""` Time (t) `"Formula:"H=I^(2)Rt` `"Calculation:From formula,"` `240=(0.2)^(2)xx(50)xxt` `therefore""240=0.04xx50xxt` `t=(240)/(0.04xx50)` `=(24xx100)/(4xx5)` `="120 second"` `therefore""t=(120)/(60)` `= " 2 minute"` |
|
| 1807. |
COELOM |
| Answer» SOLUTION :CAVITY present between the BODY and internal organs of the ANIMALS is CALLED coelom. | |
| 1808. |
Calculate the resultant resistance of 3 resistors 3Omega , 4 Omega and 12 Omega connected in parallel. |
|
Answer» SOLUTION :`(1)/(R) =(1)/(3) +(1)/(4)+(1)/(12)=(8)/(12)` `R =(12)/(8) = 1.5 Omega` |
|
| 1809. |
Is it possibleto open a cap of pen with one hand ? If not give reason . |
|
Answer» SOLUTION :(i) Yes , It is possible . TWO EQUAL & oppositeforces are requiredto PRODUCE requiredamount of torque . Two fingers can be used . (ii) Rotational MOTION produced by a single fingeris less than two fingersproducingequal & oppositeforces . |
|
| 1810. |
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 on 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 on it 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 and a buoyant force also acts on the object. Thus, true free fall is possible only in vacuum. For a freely falling object, the velocity on reaching the earth and the time taken for it can be calculated by using Newton's equations 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 to 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. Which force acts on the stone in free fall after you release it? |
| Answer» SOLUTION :Only GRAVITATIONAL FORCE ACTS on it when it is RELEASED. | |
| 1811. |
The value of accelaration due to gravity on the surface of the moon is………………….. |
|
Answer» `1.75 MS^(-1)` |
|
| 1812. |
Velocity-time graph AB (Fig.) shows that the body has |
|
Answer» a uniform accleration |
|
| 1813. |
What is angle of reflection for a ray falling normally on a plane mirror? |
| Answer» Solution :The angle of REFLECTION for a ray FALLING NORMALLY on a plane mirror is zero (0) | |
| 1814. |
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. Write kinematic equations used in free fall? |
| Answer» SOLUTION :The KINEMATIC equationsare `V="GT",s=1/2"gt"^(2)` and `v^(2)=2gs` | |
| 1815. |
A student has difficulty in reading the blackboard while sitting in the last row. What could be the defect the child is suffering from ? How can it be corrected ? |
| Answer» Solution :Since the child can.t SEE the DISTANT blackboard clearly, the child is suffering from myopia. It can be corrected by using a concave LENS of a SUITABLE focal length. | |
| 1816. |
Define real image of an object. |
| Answer» Solution :REAL image of an object is that where light RAYS from the object after reflection/refraction fro mirror/lens/prism ETC., actually CONVERGE to. | |
| 1817. |
Explain Faraday's law of induction with the help of an activity? |
|
Answer» Solution :1) Connect the terminals of a coil to a sensitive galvano-meter as shown in the figure. 2) Normally, we would not expect any deflection of needle in the galvanometer because there is no EMF in the circuit. 3) Now, if we push a bar magnet towards the coil, with its north pole facing the coil, the needle in the galvanometer deflects, showing that a current has been set up in the coil, the galvanometer does not deflect if the magnet is at rest. 4) If the magnet is moved away from the coil, the needle in the galvanometer again deflects, but in the apposite direction, which means that a current is set upin the coil in the opposite direction. 5) If we use the end of south pole of a magnet instead of north pole, the results i.e., the deflections in GALVONOMETER are exactlyopposite to the previous ONE. 6) This activity proves that the change in magnetic flux linked with a closed coil, produces current. 7) From this Faraday's law of induction can be stated as ''whenever there is a CONTINUOUS change of magnetic flux linked with a closed coil, a current is GENERATED in the coil''. This induced EMF is equal to the rate of change of magnetic flux passing through it. 
|
|
| 1818. |
10 cm high object is placed at a distance of 25 cm from a converging lens of focal length of 10 cm . Determine the position, size and type of the image. |
|
Answer» Solution :Data : Convergin lens , `f=10 cm` `u=-25 cm, h_(1)=10cm, v= ? "h"_(2)=? ` `1/f =1/v -1/u therefore 1/v=1/f +1/u` `therefore 1/v =(1)/(10cm)+(1)/(-25cm)=(1)/(10cm) -(1)/(25 cm)` `=(5-2)/(50 cm)=(3)/(50 cm)` `therefore ` Image distance ,` v=(50)/(3) cm` `DIV 16.67 cmdiv 16.7 cm` (ii) `(h_(2))/(h_(1))=(v)/(u) therefore h_(2)=(v)/(u) h_(1)` `therefore h_(2) ((50//3)cm)/(-25)xx10 cm=(50xx10)/(25xx3)cm ` `=-(20)/(3)` cm div -6.666 cm` `div -6.6 cm` The height of the image =-6.6 cm (inverted image : MINUS sign). (iii) The image is REAL, inverted and smaller than the object. |
|
| 1819. |
Name an instrument that measures electric current in a circuit. Define unit of electric current. |
| Answer» Solution :Ammeter The CURRENT is said to be one AMPERE if 1 coulomb of charge flows through a CROSS SECTION of conductor per second. | |
| 1820. |
Which mental illness is shown in the pictures given below? (##NVT_SCI_TECH_DIG_X_P2_C09_E13_009_Q01.png" width="80%"> |
| Answer» SOLUTION :The pictures SHOWS 'insensitivity 'which is a TYPE of human natures. | |
| 1821. |
Define Resistance. Give its S.I. unit. |
| Answer» Solution :Resistance is the property of a conductor to RESIST the FLOW of CURRENT through it. Its S.I. unit is ohm, REPRESENTED by the Greek letter `Omega` (omega). | |
| 1822. |
Assertion : At poles value of acceleration due to gravity (g) is greater than that of equator. Reason : Earth rotates on its axis in addition to revolving around the sun. |
|
Answer» If both the ASSERTION and the REASON are true and the reason is the correct EXPLANATION of assertion. |
|
| 1823. |
Convex lens of short focal length bends the light rays through large angles. |
|
Answer» |
|
| 1824. |
what is an epoch ? |
|
Answer» Solution :(i) An echo is the sound reproduced due to the reflection of the original sound from various rigid surface such as wall, ceilings, surfacew of mountains, etc. (ii)(i)The persistence of HEARING for human EARS is 0.1 second. This means that we can hear two sound waves clearly, if the time intervel between the two sounds is ATLEAST 0.1 s. Thus, the minimum time gap between the original sound and an echo must be 0.1 s. (ii)The above criterion can be stisfied only when the distance between the source of sound and the reflecting surface would satisfy the following equation. Velocity =`("Distance travelled by sound")/("Time TAKEN")` `V=(2d)/(t)` d=`(vt)/(2)` Since,t=0.1 second, then d`=(vxx0.1)/(2)=(v)/(20)` |
|
| 1825. |
An incident ray strikes a plane mirror at an angle of 15^@ with the mirror. The angle between the incident ray and reflected ray is |
|
Answer» `15^@`  `anglei=90^@-15^@` `=75^@` `=ANGLER` where i and r denote angles of incidence and REFLECTION RESPECTIVELY. So, the angle between the incident and reflected rays is `150^@`. |
|
| 1826. |
Mention the importance of transpiration in plants. |
|
Answer» Solution :Transpiration is the process by which the excess of WATER is released by the plants to the atmosphere. It happens with the help of guard cells. When the guard cells SHRINK the stomatal pores open and the excess water is released to the environment. * It helps the plants to KEEP cool during HOT conditions. *It helps plants to lose excess water. * As the excess water evaporates it indirectly helps US to get rain fall. * Through transpiration all the parts of the plants get water. * It helps the plants cells to be turgid. |
|
| 1827. |
Discuss the imporatance of biotechnology in the field of medicine. |
|
Answer» SOLUTION :USING genetic engineering techniques, medicinally important pharmaceutical products for the treatment of various diseases have been developed. 1. Insulin used in the treatment of diabetes. 2. HUMAN growth HORMONE used for treating children with growth deficiencies. 3. Blood CLOTTING factors are developed to treat haemophilia. 4. Development of vaccines against various diseases like Hepatitis B and rabies 5. Tissue plasminogen activator is used to dissolve blood clots and to prevent heart attack. |
|
| 1828. |
When light falls on matter, it can produce |
|
Answer» MECHANICAL EFFECT only |
|
| 1829. |
Division of nucleus : Karyokinesis : : Division of cytoplasm : ….. |
| Answer» SOLUTION :CYTOKINESIS | |
| 1830. |
A man is lying on the floor of a large, empty hemispherical hall, in such a way that his head is at the centre of the hall. He shouts ''Hello'' and hears the echo of his voice after0.2s. What is the radius of the hall ? |
|
Answer» Solution :Let the distance travalled by the sound WAVE = 2d m Time to HEAR the echo `(t) = 0.2s` , Speed of sound (v) = 340 m/s We KNOW that `v = (2d)/(t)` `implies 340 = (2 xx d)/(0.2) implies 2d = 340 xx 0.2` `implies d = (340 xx0.2)/(2)` = 34 m. As the head of the man is at the centre of hemispherical room, then 'd' is the RADIUS of the hall. Radius of the hall = 34 m.  .
|
|
| 1831. |
In charging a battery of motor car, which of the following effect of electric current is used? |
|
Answer» Heating |
|
| 1832. |
A student places a 8.0 cm tall object perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. He obtains a sharp image of the object on a screen placed on the other side of the lens. What will be the nature (inverted, erect, magnified, diminished) of the image he obtains on a screen? Draw ray diagram to justify your answer. |
Answer» SOLUTION :The IMAGE OBTAINED will be INVERTED and MAGNIFIED. 
|
|
| 1833. |
Which type of radiation requires thick layers of concrete or lead in order to be stopped ? |
| Answer» SOLUTION :GAMMA RAYS | |
| 1834. |
Explain the use of concave lenses in the following: medical equipment, scanner, CD player |
| Answer» Solution :The uses of CONCAVE lens are: (a) medical equipment, SCANNER, CD PLAYER- These INSTRUMENTS use laser light. For proper woeking of these equipment, concave lenses are used. | |
| 1835. |
Assertion (A) : A ray of light passing through the centre of curvature of a spherical mirror retraces its path after reflection from the mirror. Reason (R) : A ray of light passing through the centre of curvature of a spherical mirror is incident normally on the surface of the mirror. |
|
Answer» Both (A) and (R) are TRUE and (R) is correct explanation of the assertion. |
|
| 1836. |
Earth's gravitational force |
|
Answer» SOLUTION :i. The Earth attracts all the objects towards the surface of the Earth. II. The attraction is towards the centre of the Earth. HENCE the gravitational force of the Earth acts towards the centre of the Earth. iii. Due to this force, all objects fall vertically downwards on the earth. |
|
| 1837. |
Why do you wait for periods of music P .T.,drawing in the classroom? |
| Answer» Solution :The periods of MUSIC, DRAWING or P.T. break the boring ROUTINE. The tired brain gets REJUVENATED by music or drawing. In P.T.we are taken to the playground where we can play and exercise. These activities reduce the STRESS therefore we for the periods of music. etc. | |
| 1838. |
In Nuclear fission, Uranium 236 releases two neutrons and converts into Barium and krypton. |
| Answer» Solution :FALSE. 3 neutrons and Barium and KRYPTON. | |
| 1839. |
What are the important features of visual system of a person ? |
|
Answer» SOLUTION :(i) The STRUCTURES of the eye such as CORNEA, pupil,ciliary muscles, eye lens, aqueous HUMOUR and vitreous humour etc. (ii) The retina of eye which converts light signals to electrical IMPULSES, and (iii) Optic nerve that transmits electrical impulses to brain. |
|
| 1840. |
The area around a magnet, in which its influence (force of attraction or repulsion) can be felt, is called its |
|
Answer» MAGNETIC FIELD. |
|
| 1841. |
Two wires have the same length, same radius but one of them is made of copper and the other is made of iron. Which Will have more resistance? |
| Answer» Solution :As RESISTANCE `R = rho l/A` and RESISTIVITY `rho` for IRON is more than that for copper, the iron WIRE will have more resistance. | |
| 1842. |
A student is unable to see clearly the words written on the blackboard placed at a distance of approximately 4 m from him. Name the defect of vision the boy is suffering from. Explain the method of correcting this defect. Draw ray diagram for the : (i) defect of vision and (ii) for its correction. |
|
Answer» SOLUTION :Myopia on short-sightedness : Inability of an eye in viewing long DISTANCE objects. The image in this case falls before the retina. For EVERY myopic eye, there exists a far point beyond which clear image cannot be SEEN. The short-sightedness is corrected by using a concave LENS which diverges and shifts the image to the retina. 
|
|
| 1843. |
Which effect of electric current is utilised in the working of an electric fuse? |
| Answer» SOLUTION :An ELECTRIC FUSE works on the HEATING effect of CURRENT. | |
| 1844. |
Explain the following sentences: Saving energy is the need of the hour. |
| Answer» Solution :(1) In modern civilization, the technology and DEVELOPMENT is inevitable. For both of these, continuous energy supply is needed. (2) Just like BASIC needs of human beings, the energy has also become essential. To obtain the energy in different forms, different sources of energy are utilized. (3) Most of the energy used in India is obtained from thermal power plant. For this energy generation, various fuels are used. (4) The coal and fossil fuels are limited. Due to over- exploitation these reserves are getting fast depleted. (5) Use of fossil fuels is also RESULTING in pollution and climate change. (6) NUCLEAR energy can be very hazardous. (7) Lot of research is being done in the field of green energy, but the tremendous human population always is in need of more energy. Therefore, each and every person should save the energy, as saving energy is the need of the hour. | |
| 1845. |
……………………is the connecting link between reptiles and birds. |
|
Answer» PERIPATUS |
|
| 1846. |
What is latent heat. State its SI unit. |
| Answer» Solution :The HEAT absorbed or liberated by a substance during its change of state at a constant TEMPERATURE is called latent heat. Its SI UNIT is J/kg. | |
| 1848. |
Name the gases which are filled into the filament-type electric light bulbs. |
| Answer» SOLUTION :ARGON, NITROGEN | |
| 1849. |
You are given four pulleys and three strings. Draw a neat and labelled diagram to use them so as to obtain a maximum mechanical advantage equal to 8. In your diagram mark the directions of load L, effort E and tension in each strand. What assumptions have you made to Obtain the required mechanical advantage ? |
|
Answer» |
|
| 1850. |
Two identical resistors are first connected in series and then in parallel. Find the ratio of equivalent resistances in two cases. |
|
Answer» SOLUTION :Let two resistors of value R each are first joined in series, when equivalent resistance `R_s=R+R=2R` On JOINING these very resistors in parallel let equivalent resistance be `R_p`, where `1/R_p=1/R+1/R=2/R implies R_p=2/R` `THEREFORE R_s/R_p=(2R)/((R/2))=4/1` |
|