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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.
| 3751. |
A beam of light converges to a point P. A lens is placed is the path of convergent beam 12cm from the point P. At what point the beam converges if the lens is Here u=20cm, f=20cm from the lens equation we have |
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Answer» SOLUTION :V=uf/u+f=`12xx20-:12+20=240//320=7.5`cm As v is positive the beam CONVERGES on the same side as the of point of P |
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| 3752. |
A block and tackle system has 5 pulleys. If an effort of 1000 N is needed in downward direction to raise a load of 4500 N, calculate: (a) the mechanical advantage, (b) the velocity ratio, and (c) the efficiency of the system |
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| 3753. |
A uniform half metre rule can be balanced at the 29.0cm mark when a mass 20gis hung from its one end. (a) Draw a diagram of the arrangement (b) Find the mass of the half metre rule. ( c) In Which direction would the balancing point shift if 20g mass is shifted inside from its one end? |
| Answer» Solution :(B) 105 g (c ) towards 25 CM mark | |
| 3754. |
The laws of reflection hold good for |
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Answer» PLANE MIRROR only |
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| 3755. |
State the laws of refraction of light. If the speed of light in vacuum is 3xx10^(8)m/s find the speed of light in a medium of absolue refractive index 1.5. |
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Answer» Solution :There are two laws of refraction. Given: Speed of LIGHT in vascuum `=3xx10^(8)m//s` REFRACTIVE index of the MEDIUM `=` Speed of light in vacuum /speed of light medium. or `1.5=3xx10^(8)//v` or `v=3xx10^(8)//1.5=2xx10^(8)m/s` HENCE the speed of light in the medium of refractive index 1.5 is `2xx10^(8)` m/s |
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| 3756. |
When temperature is gradually decreased, the specific heat of a substance is |
| Answer» Answer :A | |
| 3757. |
.. .......... reverses the direction of current in the armature coil of electric motor. |
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Answer» Battery |
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| 3758. |
A cheap, conventional , commerical and inexhaustible source of energy is |
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Answer» HYDROPOWER |
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| 3759. |
How do you magnetisea piece of magneticmaterial ? |
| Answer» Solution :A piece of magnetic MATERIAL can be MAGNETISED by keepingit INSIDE a current -CARRYING SOLENOID . | |
| 3761. |
How much time satellites take in medium earth orbit to complete one revolution? |
| Answer» SOLUTION :In these ORBITS, the SATELLITES COMPLETE one revolution in 2 to 24 hours. | |
| 3762. |
It has become possible to get advance alert about ....... . .... and take proper precautions |
| Answer» SOLUTION :NATURAL calamities. We can GET INFORMATION about natural calamities before hand because of internet | |
| 3763. |
A concave mirror produces three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located ? |
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Answer» SOLUTION :Distance of object from concave MIRROR u = -10 cm As magnification of image is 3 and image is REAL, hence m = -3 `because""m = -(UPSILON)/(u)` Hence, `upsilon = - mu = -(-3) (-10) = - 30` cm Thus, image is formed 30 cm in front of the concave mirror. |
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| 3764. |
The device used for producing current is called a: |
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Answer» GENERATOR |
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| 3765. |
Which of the following phenomena of light are involved in the formation of a rainbow ? |
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Answer» Reflection, REFRACTION and DISPERSION. |
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| 3766. |
The strength of a magnetic field developed around a current-carrying straight thin wire is directly proportional to the amount of current flowing through the wire and inversely proportional to the distance from the current wire. |
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| 3768. |
What is meant by dispersion of white light ? Describe the formation of rainbow in the sky with the help of a diagram. (b) What is hypermetropia ? Draw ray diagrams to show the image formation of an object by (i) hypermetropic eye (ii) correction made with a suitable lens for hypermetric eye. |
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Answer» Solution :(a) Dispersion of WHITE is the phenomenon of splitting of white light into its constituent SEVEN COLOURS on passing through a glass prism. For formation of rainbow in the sky, (b) Hypermetropia is that defect of human eye, by virtue of which, it can SEE clearly the objects lying at large distances from the eye. But the NEARBY objects cannot be seen clearly by the hypermetropic eye. For image formation, (b) and (c ), |
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| 3769. |
You know that as we go higher than the sea level, the boiling point of water decreases. What would be effect on the melting point of solid? |
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Answer» Solution :1.As we go higher than the sea level, the PRESSURE DECREASES with increasing altitude. 2. The LOWER pressure at high altitudes will increase the melting point of SOLIDS like ice. |
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| 3770. |
(i) What are the values of (a) near point and (b) far point of vision of a normal adult person? (ii) A person with a myopic eye cannot see objects beyond 1.2 m directly. What should be the type of the corrective lens used? What would be its power? |
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Answer» Solution :(i) (a) 25 cm, (b) Infinity. (ii) To correct, an OBJECTS at infinity has to be brought at an image to 120 cm. `(1)/(F)=(1)/(-120)-(1)/((-^(@)))=(1)/(-120)` `f=-120cm` `P=(100)/(-120)=(-5)/(6)D=-0.83D` A concave lens of focal length 120 cm and power `-0.83D` is to be used. |
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| 3771. |
The 'coolants' which can be used in the reactor of a nuclear power station are : |
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Answer» liquid mercury and nitrogen DIOXIDE |
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| 3772. |
Water : denser medium :: Air : _____ |
| Answer» SOLUTION :Rarer medium In case of WATER and AIR, water ACTS as DENSER medium and air acts as rarer medium. | |
| 3773. |
What is critical angle? |
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Answer» Solution :The angle of incidence in the denser medium for which the angle of refraction in rarei- medium is `90^(@)` When the angle of incidence in water reaches a certain critical value, the REFRACTED ray lies ALONG the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle it is the LARGEST angle of incidence for which refraction can still occur |
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| 3774. |
What are the advantage of nuclear energy? |
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Answer» Solution :The advantages of NUCLEAR ENERGY are: (a) Large amount of energy is PRODUCED per unit mass (b) It does not produce smoke. It is a clean energy source. (c) Fission of one atom of uranium produces 10 milion times the energy released by BURNING of one atom of carbon from coal. (d) FUSION of four hydrogen atoms produces a huge amount of energy approximately equal to 27 MeV. |
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| 3775. |
Water of mass 200 g and temperature 30^(@)Cis taken in a copper calorimeter of mass 50g and temperature30^(@)C . A copper sphere of mass100g and temperature 100^(@)Cis released into it. What will be the maximum temperature of the mixture ? [ c ( water =1 cal //g.^(@) C , c ( copper ) = 0.1 cal//g.^(@)C ] |
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| 3776. |
Draw schematic diagram of solar thermal electric energy generation. |
Answer» SOLUTION :
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| 3777. |
Differentiate between renewable and non-renewable sources of energy. Give two examples of each. |
Answer» SOLUTION :DIFFERENCE between RENEWABLE and non-renewable SOURCES of ENERGY 
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| 3778. |
A chemical compound X is used in the soap and glass industry. It is prepared from brine. Write the equation involved in its preparation |
| Answer» Solution :`2NaHCO_(3) overset("HEAT")RARR Na_(2)CO_(3) + H_(2)O + CO` | |
| 3779. |
Explain what is DNA fingerprinting? What is the significance of this technique? |
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Answer» Solution :(1) As the FINGERPRINTS are unique for every individual, similarly the nucleotide sequence in the DNA molecule is also unique. (2) By knowing this sequence, one can find out the identity of any person. Such technique to establish the identity of a person by taking into consideration the · nucleotide sequence is called DNA FINGERPRINTING. (3) Its main use is in forensic sciences to confirm the identity of the CRIMINAL. (4) Similarly, identity of parents in case of disputed parentage for any child can be understood by taking DNA fingerprints of both the parents and a child. |
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| 3780. |
ECOSYSTEM |
| Answer» Solution :A natural UNIT that CONSISTS of living (BIOTIC) and non-living (abiotic) parts/factors which interact with each other to FORM stable system. | |
| 3781. |
Radio isotopes can be obtained from_____________. |
| Answer» SOLUTION :RADIOACTIVITY | |
| 3782. |
On whatfactor does the directionof themagnetic fieldproduced by a current - carrying straight wire depend ? |
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Answer» The MAGNITUDEOF the electriccurrent |
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| 3783. |
State Faraday's law of electromagnetic induction. |
| Answer» Solution :Whenever the magnetic field LINES linked with a coil change due to relative motion of a MAGNET and the coil, and INDUCED current is PRODUCED in the coil. The magnitude of induced current is directly proportional to the rate of change of magnetic field lines. | |
| 3784. |
Incident ray and refracted ray lie in different plane. |
| Answer» SOLUTION :CORRECT statement- Incident RAY and refracted ray LIE in same PLANE. | |
| 3785. |
Which of the following is transcriptionally active protein ? |
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Answer» plane mirror REFLECTOR |
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| 3787. |
A satellite of mass M revolving in a circular orbit of radius r_(s) around the earth of massM has a total energy E. then, its angular momentum will be |
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Answer» `(2E m_(S)r_(S))^(1/2)` |
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| 3788. |
What is the average value of accelerationvector in uniform circular motion over one cycle? |
| Answer» SOLUTION :NULL VECTOR | |
| 3789. |
A car moving along a straight highway with speed of 126 km h^(-1)is brought to a stop within a distance of 200 m. What is the retardation of the car (assumed uniform) and how long does it take for the car to stop ? |
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Answer» Solution :Initial velocity of CAR, `u=126 kmh^(-1) =126 xx (5)/(18)ms^(-1)=35ms^(-1)"" ...(i)` Since, the car finally comes to rest, `v=0` Distance COVERED, `s=200m, a=?, t=?` ` v^(2)= u^(2)-2as` or ` a=(v^(2)-u^(2))/(2s)"" ...(ii)` Substituting the values from eq. (i) in eq. (ii), we get `a=(0-(35)^(2))/(2xx200)= -(35xx35)/(400)` `=- (49)/(16)ms^(-2)` `= -3.06 ms^(-2)` Negative sign shows that acceleration in negative which is called retardation, i.e., car is uniformly retarded at `-a=3.06 ms^(-2)`. To find t, let us USE the relation `v=u+ a t` `t=(v-u)/(a)` Use `a=-3.06ms^(-2), v=0, u=35ms^(-1)`. `thereforet=(v-u)/(a)=(0-35)/(-3.06)=11.44s` `therefore t=11.44 sec.` |
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| 3790. |
Planaria , Liverfluke , Filarial worm,Tapeworm |
| Answer» Solution :FILARIAL worm. (Filarial worm is ASCHELMINTHES remaining are PLATHYHELMINTHES .) | |
| 3791. |
A convex lens of focal length f produces a real image m times the size of an object, then the distance of the object from the lens is |
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Answer» (m + 1)f MAGNIFICATION = `f/(f+u)=-m`(given) or f = -MF - MU or mu = -(m + 1)f `thereforeu=-((m+1))/mf` So, DISTANCE of the object from the lens is `((m+1)/m)f`. |
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| 3792. |
The mass of planet Jupiter is 1.9xx10^(27)kg and that of the sun is 1.99xx10^(30)kg. The mean distance of Jupiter from the Sun is 7.8xx10^(11)m. Calculate gravitational force which sun exerts on Jupiter, and the speed of Jupiter. |
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Answer» Solution :`F=(GMM)/(R^2)` `=(6.67xx10^(-11)xx1.99xx10^(30)xx1.9xx10^(27))/((7.8xx10^(11))^2)` `F=4.1xx10^(23)N` `F= (mv^(2))/(r )` `V= sqrt((Fr)/(m))= sqrt((GMm)/(r^2)xx (r )/(m))` `v= sqrt((Gm)/(r ))= sqrt((6.67xx10^(-11)xx1.9xx10^(30))/(7.8xx10^(11))` `v= 1.3xx10^(4)ms^(-1)`. |
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| 3793. |
What does the degree of closeness of the field lines represent ? |
| Answer» Solution :The degree of closeness of the FIELD LINES gives a measure OFTHE strengthof the magnetic field. | |
| 3794. |
(a) Draw magnetic field lines produced around a current carrying straight conductor passing through a cardboard. Name, state and apply the rule to mark the direction of thers field lines. (b) How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the straight wire carrying constant current? Justify your answer? |
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Answer» Solution :To MARK the direction of magnetic field lines, we will use the Right hand thumb rule. If the CURRENT carrying straight conductor is held in the right hand in such a way that the thumb POINTS towards the direction of current, then your fingers will wrap around the conductor in the direction of the field lines.  (B) `*` The strength of the magnetic field decreases when the point where magnetic field is to be DETERMINED in moved away from a straight wire carrying constant current. `*` The strength of the magnetic field is inversely proportional to the distance from the origin. As the distance increases the strength decreases. |
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| 3795. |
The fluid between the retina and the eye lens is called |
| Answer» Solution :vitreous humour | |
| 3796. |
Find the focal leght of a lens of power -2.0D. What type of lens of this? |
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Answer» SOLUTION :P=-2D,f=? `f=1/P` `=1/1(-2)` `=-0.5m` `=-50cm` Since f is NEGATIVE, the lens is CONCAVE lens. |
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| 3797. |
What is the function of pupil in human eye? |
| Answer» SOLUTION :The pupil helps to control the amount of LIGHT ENTERING the EYE. | |
| 3798. |
Every one of us can do something to reduce our personal consumption of various natural resources. List four such activities based on 3 - R approach . |
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Answer» SOLUTION :Four activitiestoreduce consumption of natural resources : (i)Reduces excessive use of natural resources like water , fossil fuels , etc. (II)Reuse of some resources instead of wasting (throwing) them , like EMPTY bottles. (iii)Recycle the materials like paper to reduce the pressure on EXISTING natural resources. (iv)Changes in lifestyle , personal attitudes and practices. |
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| 3799. |
Which option is correct for the following statements A and B? Statement A: The current passing through each resistor is the same in a series combination of resistors. Statement B: The voltage between two ends of each resistor is the same in a parallel combination of resistors. |
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Answer» STATEMENT A is TRUE but statement B is FALSE. |
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| 3800. |
Which of the following propertyof a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer). (i) (ii) (iii) (iv) |
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Answer» mass |
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