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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. |
In a hypothetical system a particle of mass m and charge −3q is moving around a very heavy particle having charge q. Assuming Bohr's model to be true to this system, the orbital velocity of mass m when it is nearest to heavy particle is (h is Planck's constant) |
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Answer» In a hypothetical system a particle of mass m and charge −3q is moving around a very heavy particle having charge q. Assuming Bohr's model to be true to this system, the orbital velocity of mass m when it is nearest to heavy particle is (h is Planck's constant) |
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| 2. |
what is scalar and vector quantity ?what z axis ? explain with diagram |
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Answer» what is scalar and vector quantity ? what z axis ? explain with diagram |
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| 3. |
The radius in kilometre to which the present radius of earth (R=6400 km) to be compressed so that the escape velocity is increased by 10 times is ______. |
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Answer» The radius in kilometre to which the present radius of earth (R=6400 km) to be compressed so that the escape velocity is increased by 10 times is ______. |
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| 4. |
The ratio of electric field due to an electric dipole on its axis and on the perpendicular bisector of dipole is |
| Answer» The ratio of electric field due to an electric dipole on its axis and on the perpendicular bisector of dipole is | |
| 5. |
If potential change from E to E/2 then in formula work done by battery =Q× potential difference ,potential difference is taken positive or negative |
| Answer» If potential change from E to E/2 then in formula work done by battery =Q× potential difference ,potential difference is taken positive or negative | |
| 6. |
In an orthogonal machining with a tool of 9° orthogonal rake angle, the uncut chip thickness is 0.2 mm. The chip thickness fluctuates between 0.25 mm and 0.4 mm. The ratio of the maximum shear angle to the minimum shear angle during machining is |
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Answer» In an orthogonal machining with a tool of 9° orthogonal rake angle, the uncut chip thickness is 0.2 mm. The chip thickness fluctuates between 0.25 mm and 0.4 mm. The ratio of the maximum shear angle to the minimum shear angle during machining is |
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| 7. |
A body of mass 1 kg, traveling with a velocity of 3 m/s, accelerates uniformly to acquire a velocity of 8 m/s in 2 s. Find the force acting on the body. |
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Answer» A body of mass 1 kg, traveling with a velocity of 3 m/s, accelerates uniformly to acquire a velocity of 8 m/s in 2 s. Find the force acting on the body. |
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| 8. |
Five equal resistaces each of resistance r are connected as shown in figure. A battery of V volt is connected between A and B. The current flowing in AFCEB will be |
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Answer» Five equal resistaces each of resistance r are connected as shown in figure. A battery of V volt is connected between A and B. The current flowing in AFCEB will be |
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| 9. |
Four students A, B, C, and D while performing an experiment on establishing the relation between the loss of weight of a small solid when fully immersed in tap water, and the weight of water displaced by it, used four different shapes of overflow cans containing water as shown.The arrangement, that would give correct results, is that of student :(1) (A)(2) (B)(3) (C)(4) (D) |
Answer» Four students A, B, C, and D while performing an experiment on establishing the relation between the loss of weight of a small solid when fully immersed in tap water, and the weight of water displaced by it, used four different shapes of overflow cans containing water as shown. The arrangement, that would give correct results, is that of student : (1) (A) (2) (B) (3) (C) (4) (D) |
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| 10. |
Electric potential in space is given by,V-9(x -y), (where, x and y are cartesian Co-ordinates). The electric field vector in appropriateunits is(1)-27x2 i +27 угј(8) 27x\ast yi +27xy?1(2)27 xi +27 yi(4)-27xyi +27xyj |
| Answer» Electric potential in space is given by,V-9(x -y), (where, x and y are cartesian Co-ordinates). The electric field vector in appropriateunits is(1)-27x2 i +27 угј(8) 27x\ast yi +27xy?1(2)27 xi +27 yi(4)-27xyi +27xyj | |
| 11. |
The electric field ‘E’ current density ‘J’ and conductivity of a conductor are related as |
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Answer» The electric field ‘E’ current density ‘J’ and conductivity of a conductor are related as |
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| 12. |
Some capacitors each of capacitance 30 μF are connected as shown in the figure. Calculate equivalent capacitance between terminals A and B (in μF). |
Answer» Some capacitors each of capacitance 30 μF are connected as shown in the figure. Calculate equivalent capacitance between terminals A and B (in μF). |
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| 13. |
A pipe closed at one end produces a fundamental frequency of 375 Hz. If it is cut into two pipes of equal length, then the fundamental frequency produced by the open and closed pipes respectively are |
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Answer» A pipe closed at one end produces a fundamental frequency of 375 Hz. If it is cut into two pipes of equal length, then the fundamental frequency produced by the open and closed pipes respectively are |
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| 14. |
ntAn observer looks at a distant tree of height 10m with a telescope of magnifying power of 20. To the observer the tree appearsn ntA. 10 times nearern ntB. 20 times tallern ntC. 20 times nearern ntD. 10 times tallern |
| Answer» ntAn observer looks at a distant tree of height 10m with a telescope of magnifying power of 20. To the observer the tree appearsn ntA. 10 times nearern ntB. 20 times tallern ntC. 20 times nearern ntD. 10 times tallern | |
| 15. |
Electron and proton are accelerated through one volt of potential difference, what will be the ratio of their wavelengths? |
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Answer» Electron and proton are accelerated through one volt of potential difference, what will be the ratio of their wavelengths? |
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| 16. |
What is the direction of velocity of approach/ separation? |
| Answer» What is the direction of velocity of approach/ separation? | |
| 17. |
A fan of moment of ineria 0.6 kgm^2 is to run upto a working speed of 0.5 revolution per second . Indicate the correct value of the angular moment of fan |
| Answer» A fan of moment of ineria 0.6 kgm^2 is to run upto a working speed of 0.5 revolution per second . Indicate the correct value of the angular moment of fan | |
| 18. |
A system of solid discs, each of mass M and radius R is shown in figure. Find the MOI about an axis passing through point O and perpendicular to the plane. |
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Answer» A system of solid discs, each of mass M and radius R is shown in figure. |
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| 19. |
A photoelectric surface is illuminated successively by monochromatic light of wavelengths λ and λ2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is(h = Planck's constant, c = speed of light) |
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Answer» A photoelectric surface is illuminated successively by monochromatic light of wavelengths λ and λ2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is |
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| 20. |
Three particles of masses 1 kg,2 kg and 3 kg are situated at the corners of an equilateral triangle of side b. The (x,y) coordinates respectively for the centre of mass of the system of particles will be: |
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Answer» Three particles of masses 1 kg,2 kg and 3 kg are situated at the corners of an equilateral triangle of side b. The (x,y) coordinates respectively for the centre of mass of the system of particles will be: |
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| 21. |
Draw the output Y in the given combination of gates. |
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Answer» Draw the output Y in the given combination of gates.
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| 22. |
A solution which is 10−3 N each in Mn2+, Fe2+, Zn2+ and Hg2+ is treated with 10−16 M sulphide ion. If Ksp values of MnS, FeS, ZnS and HgS are 10−15, 10−23, 10−20 and 10−54 respectively, which one will precipitate first ? |
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Answer» A solution which is 10−3 N each in Mn2+, Fe2+, Zn2+ and Hg2+ is treated with 10−16 M sulphide ion. If Ksp values of MnS, FeS, ZnS and HgS are 10−15, 10−23, 10−20 and 10−54 respectively, which one will precipitate first ? |
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| 23. |
A system is shown in the figure. A man standing on the block is pulling the rope. If the man pulls 2 m of the rope in each second, then the velocity of the block will be [Assume that the block does not rotate and rope is inextensible.] |
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Answer» A system is shown in the figure. A man standing on the block is pulling the rope. If the man pulls 2 m of the rope in each second, then the velocity of the block will be |
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| 24. |
The refractive index of a piece of transparent quartz is the greatest for [MP PET 1985, 94] |
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Answer» The refractive index of a piece of transparent quartz is the greatest for |
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| 25. |
For a circular coil of radius R and N turns carrying current I, themagnitude of the magnetic field at a point on its axis at a distance xfrom its centre is given by,( )202 2 3/2 2IR NBx Rμ=+(a) Show that this reduces to the familiar result for field at thecentre of the coil.(b) Consider two parallel co-axial circular coils of equal radius R,and number of turns N, carrying equal currents in the samedirection, and separated by a distance R. Show that the field onthe axis around the mid-point between the coils is uniform overa distance that is small as compared to R, and is given by,0 0.72NIBRμ= , approximately.[Such an arrangement to produce a nearly uniform magneticfield over a small region is known as Helmholtz coils.] |
| Answer» For a circular coil of radius R and N turns carrying current I, themagnitude of the magnetic field at a point on its axis at a distance xfrom its centre is given by,( )202 2 3/2 2IR NBx Rμ=+(a) Show that this reduces to the familiar result for field at thecentre of the coil.(b) Consider two parallel co-axial circular coils of equal radius R,and number of turns N, carrying equal currents in the samedirection, and separated by a distance R. Show that the field onthe axis around the mid-point between the coils is uniform overa distance that is small as compared to R, and is given by,0 0.72NIBRμ= , approximately.[Such an arrangement to produce a nearly uniform magneticfield over a small region is known as Helmholtz coils.] | |
| 26. |
1)Volume doubled V=2v by keeping area constant length is varied find Rnew?2)Volume us halved by keeping length same what is Rnew?3)For keeping same volume if radius of wire is halved what is Rnew?4)For same wire if length is 5times what is Renee? |
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Answer» 1)Volume doubled V=2v by keeping area constant length is varied find Rnew? 2)Volume us halved by keeping length same what is Rnew? 3)For keeping same volume if radius of wire is halved what is Rnew? 4)For same wire if length is 5times what is Renee? |
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| 27. |
There is a small ball A of mass m which is suspended vertically with the help of a light string of length l as shown in the figure. A bullet of same mass and moving with a horizontal speed u strikes the ball A and gettes embedded in it. The maximum angular deflection of the string from the vertical will |
| Answer» There is a small ball A of mass m which is suspended vertically with the help of a light string of length l as shown in the figure. A bullet of same mass and moving with a horizontal speed u strikes the ball A and gettes embedded in it. The maximum angular deflection of the string from the vertical will | |
| 28. |
A person wants to drive on the vertical surface of a large cylindrical wooden 'well' commonly known as death well' in a circus. The radius of the well is R and the coefficient of friction between the tyres of the motorcycle and the wall of the well is μs. The minimum speed, the motorcycle must have in order to prevent slipping, should be |
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Answer» A person wants to drive on the vertical surface of a large cylindrical wooden 'well' commonly known as death well' in a circus. The radius of the well is R and the coefficient of friction between the tyres of the motorcycle and the wall of the well is μs. The minimum speed, the motorcycle must have in order to prevent slipping, should be |
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| 29. |
There are 3 charges of +1C, +2C and +3C at the vertices of an equilateral triangle of length 2m. What is the Potential energy of the system assuming potential energy at infinite separation to be zero? |
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Answer» There are 3 charges of +1C, +2C and +3C at the vertices of an equilateral triangle of length 2m. What is the Potential energy of the system assuming potential energy at infinite separation to be zero? |
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| 30. |
If Sameer moves from point A having position vector 3^i+2^j+5^k to point B having position vector 6^i+3^j+7^k, what is his displacement vector? |
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Answer» If Sameer moves from point A having position vector 3^i+2^j+5^k to point B having position vector 6^i+3^j+7^k, what is his displacement vector? |
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| 31. |
A ball of mass 500 g is initially at rest at the bottom most point of a smooth vertical circular track of radius 10 m. For looping a loop, the minimum kinetic energy the ball should have at the bottommost point on the track is |
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Answer» A ball of mass 500 g is initially at rest at the bottom most point of a smooth vertical circular track of radius 10 m. For looping a loop, the minimum kinetic energy the ball should have at the bottommost point on the track is |
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| 32. |
What is the difference between magnetic feild intensity at a point and magnetic feild at a point?? |
| Answer» What is the difference between magnetic feild intensity at a point and magnetic feild at a point?? | |
| 33. |
A ball is thrown at an angle θ with the horizontal. Its initial kinetic energy is 100 J and it becomes 30 J at the highest point. The angle of projection is |
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Answer» A ball is thrown at an angle θ with the horizontal. Its initial kinetic energy is 100 J and it becomes 30 J at the highest point. The angle of projection is |
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| 34. |
On electrolysis of an oxytungsten complex ion using 1.0 A for 48.25 min produces 0.92 g of tungsten. What is the charge on tungsten in material? (Atomic weight W=184 u) |
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Answer» On electrolysis of an oxytungsten complex ion using 1.0 A for 48.25 min produces 0.92 g of tungsten. What is the charge on tungsten in material? (Atomic weight W=184 u) |
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| 35. |
The work done in an adiabatic change in a gas depends only on |
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Answer» The work done in an adiabatic change in a gas depends only on |
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| 36. |
What are physical and derived quantity? |
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Answer» What are physical and derived quantity? |
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| 37. |
Two point sources of sound are kept at a separation of 10 cm. They vibrate in phase to produce waves of wavelength 6.0 cm. What would be the phase difference between the two waves arriving at a point 20 cm from one source (a) on the line joining the sources and (b) on the perpendicular bisector of the line joining the sources? |
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Answer» Two point sources of sound are kept at a separation of 10 cm. They vibrate in phase to produce waves of wavelength 6.0 cm. What would be the phase difference between the two waves arriving at a point 20 cm from one source (a) on the line joining the sources and (b) on the perpendicular bisector of the line joining the sources? |
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| 38. |
Why lowering of vapour pressure is not a collegave property |
| Answer» Why lowering of vapour pressure is not a collegave property | |
| 39. |
Power applied to a particle varies with time as P=(3t2−2t+1) watt, where t is in second. Find the change in its kinetic energy between time t=2s and t=4s. |
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Answer» Power applied to a particle varies with time as P=(3t2−2t+1) watt, where t is in second. Find the change in its kinetic energy between time t=2s and t=4s. |
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| 40. |
Water flows between two plates, of which the upper one is stationary and the lower one is moving with a velocity V. What will be the velocity of the fluid in contact with the upper plate? |
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Answer» Water flows between two plates, of which the upper one is stationary and the lower one is moving with a velocity V. What will be the velocity of the fluid in contact with the upper plate? |
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| 41. |
Explain three laws of motion |
| Answer» Explain three laws of motion | |
| 42. |
The velocity of an object is given by v=(6 t3i cap+t2 j cap)m/s.Find a at t=2m/s |
| Answer» The velocity of an object is given by v=(6 t3i cap+t2 j cap)m/s.Find a at t=2m/s | |
| 43. |
10.2-m-long copper pipe is held vertically. When a marble is dropped down the pipe, it falls through in about 0.7 s.A magnet of similar size and shape takes much longer to fall through the pipe. (a) As the magnet is falling through the pipe with its north pole below its south pole. The pipe is suspended from a spring scale. The weight of the pipe is 12.0 N; the weight of the marble and magnet are each 0.3 N. Sketch graphs to show the reading of the spring scale as a function of time for the fall of the marble and again for the fall of the magnet. Label the vertical axis with numerical values. |
| Answer» 10.2-m-long copper pipe is held vertically. When a marble is dropped down the pipe, it falls through in about 0.7 s.A magnet of similar size and shape takes much longer to fall through the pipe. (a) As the magnet is falling through the pipe with its north pole below its south pole. The pipe is suspended from a spring scale. The weight of the pipe is 12.0 N; the weight of the marble and magnet are each 0.3 N. Sketch graphs to show the reading of the spring scale as a function of time for the fall of the marble and again for the fall of the magnet. Label the vertical axis with numerical values. | |
| 44. |
The radiation force experienced by a body exposed to radiation of intensity I0, assuming the surface of the body to be perfectly absorbing is |
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Answer» The radiation force experienced by a body exposed to radiation of intensity I0, assuming the surface of the body to be perfectly absorbing is |
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| 45. |
To determine the half life of a radioactive element, student plots a graph of ln∣∣∣dN(t)dt∣∣∣ versus t. Here dN(t)/dt is the rate of radioactive decay at time t. If the number of radioactive nuclei of this element decreases by a factor of p after 4.16 years, the value of p is ____. (Round off the nearest integer) (e4.16=64.07) |
Answer» To determine the half life of a radioactive element, student plots a graph of ln∣∣∣dN(t)dt∣∣∣ versus t. Here dN(t)/dt is the rate of radioactive decay at time t. If the number of radioactive nuclei of this element decreases by a factor of p after 4.16 years, the value of p is ____. (Round off the nearest integer) (e4.16=64.07) |
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| 46. |
What is the magnetic force experienced by a particle of charge 6 C entering perpendicularly in a uniform magnetic field of 5T with a speed of 3 m/ |
| Answer» What is the magnetic force experienced by a particle of charge 6 C entering perpendicularly in a uniform magnetic field of 5T with a speed of 3 m/ | |
| 47. |
A spherical ball of mass 20kg is stationary at the top of a 100m high hill. It rolls down a smooth surface to the ground, then climbs up another 30m high base at a height rolls down to a horizontal base at a height of 20m above ground. The velocity attained by the ball is? |
| Answer» A spherical ball of mass 20kg is stationary at the top of a 100m high hill. It rolls down a smooth surface to the ground, then climbs up another 30m high base at a height rolls down to a horizontal base at a height of 20m above ground. The velocity attained by the ball is? | |
| 48. |
A slider crank mechanism is shown in the figure. At some instant, the crank angle is 45o and a force of 40 N is acting towards the left on the slider. The length of the crank is 30 mm and the connecting rod is 70 mm. Ignoring the effect of gravity, friction and inertial forces, the magnitude of the crankshaft toruqe(in Nm) needed to keep the mechanism in equlibrium is (correct to two decimal places). |
Answer» A slider crank mechanism is shown in the figure. At some instant, the crank angle is 45o and a force of 40 N is acting towards the left on the slider. The length of the crank is 30 mm and the connecting rod is 70 mm. Ignoring the effect of gravity, friction and inertial forces, the magnitude of the crankshaft toruqe(in Nm) needed to keep the mechanism in equlibrium is  |
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| 49. |
A cyclic process ABCA is shown in the V−T diagram. The representation of the same cyclic process on the P−V diagram is |
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Answer» A cyclic process ABCA is shown in the V−T diagram. The representation of the same cyclic process on the P−V diagram is |
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| 50. |
In the given circuit, the equivalent resistance of the circuit as observed across the battery of potential difference 6.5 V is - |
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Answer» In the given circuit, the equivalent resistance of the circuit as observed across the battery of potential difference 6.5 V is - |
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