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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A body of mass 5 kg is acted upon by two perpendicular forces 8 N and 6 N. Give the magnitude and direction of the acceleration of the body. |
| Answer» A body of mass 5 kg is acted upon by two perpendicular forces 8 N and 6 N. Give the magnitude and direction of the acceleration of the body. | |
| 2. |
If the work function of a photometal is 6.825 eV. Its threshold wavelength will be (c=3×108 m/s) |
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Answer» If the work function of a photometal is 6.825 eV. Its threshold wavelength will be (c=3×108 m/s) |
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| 3. |
A wave pulse is travelling on a string with a speed v towards the positive X-axis. The shape of the string at t = 0 is given by g(x) =A sin(xa) where A and a are constants. Write the equation of the wave for a general time t, if the wave speed is v. |
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Answer» A wave pulse is travelling on a string with a speed v towards the positive X-axis. The shape of the string at t = 0 is given by g(x) =A sin(xa) where A and a are constants. Write the equation of the wave for a general time t, if the wave speed is v. |
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| 4. |
Planck’s constant (h), speed of light in vacuum (c) and Newton’s gravitational constant (G) are three fundamental constants. Which one of the following combinations of these has the dimension of length? |
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Answer» Planck’s constant (h), speed of light in vacuum (c) and Newton’s gravitational constant (G) are three fundamental constants. Which one of the following combinations of these has the dimension of length? |
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| 5. |
A simple pendulum performs simple harmonic motion about X = 0 with an amplitude A and time period T. The speed of the pendulum at X = A2 will be [MP PMT 1987] |
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Answer» A simple pendulum performs simple harmonic motion about X = 0 with an amplitude A and time period T. The speed of the pendulum at X = A2 will be [MP PMT 1987] |
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| 6. |
As SHM is maintaining in a straight line why angular frequency has been used |
| Answer» As SHM is maintaining in a straight line why angular frequency has been used | |
| 7. |
A car, starting from rest, is accelerated at a constant rate α until it attains a speed v. It is then retarded at a constant rate β until it comes to rest. The average speed of the car during its entire journey is |
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Answer» A car, starting from rest, is accelerated at a constant rate α until it attains a speed v. It is then retarded at a constant rate β until it comes to rest. The average speed of the car during its entire journey is |
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| 8. |
A solid uniform ball of volume V floats on the interface of two immiscible liquids (see the figure). The specific gravity of the upper liquid is ρ1 and that of lower one is ρ2 and the specific gravity of ball is ρ(ρ1<ρ<ρ2). The fraction of the volume of the ball in the upper liquid is |
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Answer» A solid uniform ball of volume V floats on the interface of two immiscible liquids (see the figure). The specific gravity of the upper liquid is ρ1 and that of lower one is ρ2 and the specific gravity of ball is ρ(ρ1<ρ<ρ2). The fraction of the volume of the ball in the upper liquid is |
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| 9. |
A driving mirror having radius of curvature 100 cm and length over the curved surface is 10 cm. If the eye of the driver is assumed to be at a large distance, then the field of view in radians is: (consider paraxial rays only and small mirror operator) |
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Answer» A driving mirror having radius of curvature 100 cm and length over the curved surface is 10 cm. If the eye of the driver is assumed to be at a large distance, then the field of view in radians is: (consider paraxial rays only and small mirror operator) |
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| 10. |
A particle is moving in a circle of radius r with a uniform speed u. C is the centre of the circle and AB is the diameter. The angular velocity of P about A and C are in the ratio : |
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Answer» A particle is moving in a circle of radius r with a uniform speed u. C is the centre of the circle and AB is the diameter. The angular velocity of P about A and C are in the ratio : |
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| 11. |
The focal length of a concave mirror is f.If an object is placed at a distance x from the principal focus away from the mirror,what is the ratio of the size of the image to the size of the object?(3m) |
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Answer» The focal length of a concave mirror is f.If an object is placed at a distance x from the principal focus away from the mirror,what is the ratio of the size of the image to the size of the object?(3m) |
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| 12. |
Q 14/15 If the tension on a wire is removed at once,then 1. tempwrature reduces 2.temperature remain cons†an t 3.temperature increases 4.it will brea |
| Answer» Q 14/15 If the tension on a wire is removed at once,then 1. tempwrature reduces 2.temperature remain cons†an t 3.temperature increases 4.it will brea | |
| 13. |
12A spherical conducting shell of inner radius Rq isand outer radius R, has a charge Q. A chargeplaced at the centre of the shell.0 What is the surface charge density on the(1) Inner surface, (2) Outer surface of theshell?Write the expression for the electric field ata point X >R from the centre of the shell.Gi)All India 2010 |
| Answer» 12A spherical conducting shell of inner radius Rq isand outer radius R, has a charge Q. A chargeplaced at the centre of the shell.0 What is the surface charge density on the(1) Inner surface, (2) Outer surface of theshell?Write the expression for the electric field ata point X >R from the centre of the shell.Gi)All India 2010 | |
| 14. |
in an equilibrium condition can there be any movement? |
| Answer» in an equilibrium condition can there be any movement? | |
| 15. |
The SI and CGS units of energy are joule and erg respectively. How many ergs are equal to one joule? |
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Answer» The SI and CGS units of energy are joule and erg respectively. How many ergs are equal to one joule? |
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| 16. |
.The ladder shown in figure has negligible mass and rests onfrictionless floor. A crossbar connects the two legs of theladder at the centre as shown. The angle between the twolegs is 60- The fat person sitting on the ladder has a massof 80 kg. Find the constant forces exerted by thefloor on each leg and the tension in the crossbar.1m60^° 30imSmooth |
| Answer» .The ladder shown in figure has negligible mass and rests onfrictionless floor. A crossbar connects the two legs of theladder at the centre as shown. The angle between the twolegs is 60- The fat person sitting on the ladder has a massof 80 kg. Find the constant forces exerted by thefloor on each leg and the tension in the crossbar.1m60^° 30imSmooth | |
| 17. |
Estimate the wavelength at which plasma reflection will occur for a metal having the denisty of electrons N≈4×1027m−3. Take ε0≈10−11 and m≈10−30, where these quantities are in proper Sl units |
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Answer» Estimate the wavelength at which plasma reflection will occur for a metal having the denisty of electrons N≈4×1027m−3. Take ε0≈10−11 and m≈10−30, where these quantities are in proper Sl units |
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| 18. |
19.An elevator accelerates upwards at a constant rate. A uniform string of length L and mass m supports a small black CK of mass M that hangs from the ceiling of the elevator. The tension at a distance l from the ceiling is T. Find the acceleration of the elevator. |
| Answer» 19.An elevator accelerates upwards at a constant rate. A uniform string of length L and mass m supports a small black CK of mass M that hangs from the ceiling of the elevator. The tension at a distance l from the ceiling is T. Find the acceleration of the elevator. | |
| 19. |
A 2μF capacitor is initially charged to 20 Volts and then shorted across a 8μH inductor. The maximum value of the current in the circuit (in A) is |
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Answer» A 2μF capacitor is initially charged to 20 Volts and then shorted across a 8μH inductor. The maximum value of the current in the circuit (in A) is |
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| 20. |
metallicsshells. The outermost shell has charge g tericamost shell has charge q, and theuncharged. The charge appearing on the inner surfaof outermost shell isq2, the innermiddle shell is2 Figure shows three concentricr12(1) q+ 92(2) 922(4) Zero |
| Answer» metallicsshells. The outermost shell has charge g tericamost shell has charge q, and theuncharged. The charge appearing on the inner surfaof outermost shell isq2, the innermiddle shell is2 Figure shows three concentricr12(1) q+ 92(2) 922(4) Zero | |
| 21. |
A particle of mass 10 kg is thrown at an angle of 37∘ with horizontal with an initial velocity of 5 m/s. The kinetic energy of the projectile when it just reaches the ground will be |
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Answer» A particle of mass 10 kg is thrown at an angle of 37∘ with horizontal with an initial velocity of 5 m/s. The kinetic energy of the projectile when it just reaches the ground will be |
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| 22. |
how will the ratio of 2 forces be 1:1 in a body acting on 2 charges +2microC and -3microC WHEN FORCE IS "CHARGE DEPENDENT"? |
| Answer» how will the ratio of 2 forces be 1:1 in a body acting on 2 charges +2microC and -3microC WHEN FORCE IS "CHARGE DEPENDENT"? | |
| 23. |
There are two spherical balls A and B of the same material with same surface, but the diameter of A is half that of B. If A and B are heated to the same temperature and then allowed to cool, then |
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Answer» There are two spherical balls A and B of the same material with same surface, but the diameter of A is half that of B. If A and B are heated to the same temperature and then allowed to cool, then |
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| 24. |
A Zener diode has a contact potential of 1.5 V in the absence of biasing. It undergoes Zener breakdown for an electric field of 106 V/m at the depletion region of p−n junction. If the width of the depletion region is 2.5 μm, ______ be the reverse biased potential (in V) for the Zener breakdown to occur. |
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Answer» A Zener diode has a contact potential of 1.5 V in the absence of biasing. It undergoes Zener breakdown for an electric field of 106 V/m at the depletion region of p−n junction. If the width of the depletion region is 2.5 μm, ______ be the reverse biased potential (in V) for the Zener breakdown to occur. |
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| 25. |
A point object is kept at the focus of a convex lens |
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Answer» A point object is kept at the focus of a convex lens |
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| 26. |
The potential difference across the terminals of a battery is 8.4V when there is a current of 1.5V in the battery from the negative to the positive terminal. When the current is 3.5A in the reverse direction, the potential difference becomes 9.4V. (a) What is the internal resis†an ce of the battery? (b) What is the emf of the battery? |
| Answer» The potential difference across the terminals of a battery is 8.4V when there is a current of 1.5V in the battery from the negative to the positive terminal. When the current is 3.5A in the reverse direction, the potential difference becomes 9.4V. (a) What is the internal resis†an ce of the battery? (b) What is the emf of the battery? | |
| 27. |
It is possible to project a particle with a given speed in two possible ways so as to have the same range, R. The product of the times taken to reach this point in the two possible ways is proportional to |
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Answer» It is possible to project a particle with a given speed in two possible ways so as to have the same range, R. The product of the times taken to reach this point in the two possible ways is proportional to |
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| 28. |
if y=a^x and y=\ln x have a solution then find range of a |
| Answer» if y=a^x and y=\ln x have a solution then find range of a | |
| 29. |
14. Two cyclists A and B start from the junction of two roads inclined at 90 degree , the ratio of their velocities being 3 : 4 . Find the ratio of the rate at which two cyclists are separating with the velocity of A. |
| Answer» 14. Two cyclists A and B start from the junction of two roads inclined at 90 degree , the ratio of their velocities being 3 : 4 . Find the ratio of the rate at which two cyclists are separating with the velocity of A. | |
| 30. |
the potential energy of a particle of mass 100g moving along x axis is given by U=5x(x-4),where x in metre find period of oscillation |
| Answer» the potential energy of a particle of mass 100g moving along x axis is given by U=5x(x-4),where x in metre find period of oscillation | |
| 31. |
A body dropped from height h with initial velocity zero, strikes the ground with a velocity 3m/s. Anothr body of same mass is thrown from the same height h with an initial velocity of 4 m/s. Find the final velocity of second mass, with which it strikes the ground 1)5m/s 2) 3m/s |
| Answer» A body dropped from height h with initial velocity zero, strikes the ground with a velocity 3m/s. Anothr body of same mass is thrown from the same height h with an initial velocity of 4 m/s. Find the final velocity of second mass, with which it strikes the ground 1)5m/s 2) 3m/s | |
| 32. |
Young's double slit experiment is performed using light of wave length λ. One of the slits is covered by a thin glass sheet of refractive index μ at this wavelength. The smallest thickness of the sheet to bring the adjacent minimum to the centre of the screen is |
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Answer» Young's double slit experiment is performed using light of wave length λ. One of the slits is covered by a thin glass sheet of refractive index μ at this wavelength. The smallest thickness of the sheet to bring the adjacent minimum to the centre of the screen is |
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| 33. |
the excess pressure inside a spherical drop of water is four times that of another drop. then their respective mass ratio is |
| Answer» the excess pressure inside a spherical drop of water is four times that of another drop. then their respective mass ratio is | |
| 34. |
A point charge +q is placed at the mid-point of a cube of side l. The electric flux emerging from the cube is |
| Answer» A point charge +q is placed at the mid-point of a cube of side l. The electric flux emerging from the cube is | |
| 35. |
The schematic of a two stage air compressor with an intercooler is shown.The temperature of air after first stage compression is _____°C. (Assume all process to be ideal and optimal)157.94 |
Answer» The schematic of a two stage air compressor with an intercooler is shown. The temperature of air after first stage compression is _____°C. (Assume all process to be ideal and optimal)
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| 36. |
Explain how Corpusculartheory predicts the speed of light in a medium, say, water, to begreater than the speed of light in vacuum. Is the predictionconfirmed by experimental determination of the speed of light inwater? If not, which alternative picture of light is consistent withexperiment? |
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Answer» Explain how Corpuscular |
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| 37. |
Two resistors, 4 Ω and 6 Ω are connected in parallel with a 6 V battery of negligible resistance. Calculate the current flowing through 4 Ω resistor. |
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Answer» Two resistors, 4 Ω and 6 Ω are connected in parallel with a 6 V battery of negligible resistance. Calculate the current flowing through 4 Ω resistor. |
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| 38. |
if in cartesian plane ,a convex lens is placed at the origin and a light source is placed at a point (-f/3,0), where f is the focal length of the lens ,then (1)virtual image of magnification 3/2 will be formed at [-f/2,0](2)virtual image of magnification 4/3 will be formed at [-f/2,0](3)real image of magnification 3/4 will be formed at [f/2,0](4)virtual image of magnification 3/2 will be formed at [f/2,0] |
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Answer» if in cartesian plane ,a convex lens is placed at the origin and a light source is placed at a point (-f/3,0), where f is the focal length of the lens ,then (1)virtual image of magnification 3/2 will be formed at [-f/2,0] (2)virtual image of magnification 4/3 will be formed at [-f/2,0] (3)real image of magnification 3/4 will be formed at [f/2,0] (4)virtual image of magnification 3/2 will be formed at [f/2,0] |
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| 39. |
110.A tunning fork vibrating with a sonometer having a wire of length 20cm produces 5 beats /sec. The beats frequency doesn't change if the length of the wire is changed to 21cm. The frequency of the tunning fork must be 1) 200Hz 2) 210Hz 3) 205Hz 4) 215H |
| Answer» 110.A tunning fork vibrating with a sonometer having a wire of length 20cm produces 5 beats /sec. The beats frequency doesn't change if the length of the wire is changed to 21cm. The frequency of the tunning fork must be 1) 200Hz 2) 210Hz 3) 205Hz 4) 215H | |
| 40. |
A dielectric sphere is placed in uniform electric field →E as shown in figure. AB = BC = 2R. EA,EB and EC are electric field at A, B and C respectively, then |
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Answer» A dielectric sphere is placed in uniform electric field →E as shown in figure. AB = BC = 2R. EA,EB and EC are electric field at A, B and C respectively, then |
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| 41. |
A spherical shell of mass M/2 is enclosing a solid sphere of mass 3M and radius 2R. Then ratio of potential because of the spherical shell and the solid sphere at their common centre is |
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Answer» A spherical shell of mass M/2 is enclosing a solid sphere of mass 3M and radius 2R. Then ratio of potential because of the spherical shell and the solid sphere at their common centre is |
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| 42. |
The charge flowing through a resistance R varies with time as q=2t−8t2. The total heat produced in the resistance (for 0≤ t ≤ 18) is |
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Answer» The charge flowing through a resistance R varies with time as q=2t−8t2. The total heat produced in the resistance (for 0≤ t ≤ 18) is |
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| 43. |
A string wrapped around the pulley as shown in the figure is pulled with a constant force →F of magnitude 100 N. The radius R and moment of inertia I of the pulley are 0.1 m and 1.25×10−3 kgm2 respectively. If the string does not slips, what is the angular velocity of pulley after 1 m of string has been unwounded? Assume the pulley starts from rest. |
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Answer» A string wrapped around the pulley as shown in the figure is pulled with a constant force →F of magnitude 100 N. The radius R and moment of inertia I of the pulley are 0.1 m and 1.25×10−3 kgm2 respectively. If the string does not slips, what is the angular velocity of pulley after 1 m of string has been unwounded? Assume the pulley starts from rest. |
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| 44. |
A charge particle of mass 0.003gm is held stationary in space by placing it in downward direction of electric field 610Nc- then find the magnitude of charge. |
| Answer» A charge particle of mass 0.003gm is held stationary in space by placing it in downward direction of electric field 610Nc- then find the magnitude of charge. | |
| 45. |
The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose? |
| Answer» The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose? | |
| 46. |
Anelectrical technician requires a capacitance of 2 µF in acircuit across a potential difference of 1 kV. A large number of 1 µFcapacitors are available to him each of which can withstand apotential difference of not more than 400 V. Suggest a possiblearrangement that requires the minimum number of capacitors. |
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Answer» An |
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| 47. |
35. If charge on a capacitor is increased by 2 C, thenenergy stored in it increases by 21 %. Then theoriginal charge on the capacitor is.(1) 40 C(2) 30 C(3) 20 C(4) 10 CCE |
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Answer» 35. If charge on a capacitor is increased by 2 C, then energy stored in it increases by 21 %. Then the original charge on the capacitor is. (1) 40 C (2) 30 C (3) 20 C (4) 10 C CE |
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| 48. |
ntq) A 100 V voltmeter of inetrnal resistance 20kohm in series with a high resistance R is connected to a 110V line . The voltmeter raeds 5V , the value of R is ( in k ohm)n nta)210n ntb) 315n ntc) 420n ntd) 440n ntn |
| Answer» ntq) A 100 V voltmeter of inetrnal resistance 20kohm in series with a high resistance R is connected to a 110V line . The voltmeter raeds 5V , the value of R is ( in k ohm)n nta)210n ntb) 315n ntc) 420n ntd) 440n ntn | |
| 49. |
The maximum bending moment due to an isolated load in a three-hinged parabolic arch (span l, rise h) having one of its hinges at the crown, occurs on either side of the crown at a distance |
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Answer» The maximum bending moment due to an isolated load in a three-hinged parabolic arch (span l, rise h) having one of its hinges at the crown, occurs on either side of the crown at a distance |
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| 50. |
In the arrangement shown in the figure, masses of the blocks A and B are m and 2 m respectively. Surface between block B and floor is smooth. The block B is connected to the block C by means of a string pulley system. If the whole system is released, then find the minimum value of mass of block C so that block A remains stationary w.r.t. B. Coefficient of friction between A and B is μ. |
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Answer» In the arrangement shown in the figure, masses of the blocks A and B are m and 2 m respectively. Surface between block B and floor is smooth. The block B is connected to the block C by means of a string pulley system. If the whole system is released, then find the minimum value of mass of block C so that block A remains stationary w.r.t. B. Coefficient of friction between A and B is μ. |
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