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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 non conducting rod of length L and negligible mass with two small balls each of mass m and charge Q attatched to its ends. the rod can rotate in the horizontal plane about a fixed vertical axis crossing it a distance L/4 from one of the ends. A uniform horizontal electric field is established.At first the rod is in unstable equilibrium. If it is slightly disturbed from this position, the max. velocity attained by the ball which is closer to the axis in subsequent motion is? |
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Answer» A non conducting rod of length L and negligible mass with two small balls each of mass m and charge Q attatched to its ends. the rod can rotate in the horizontal plane about a fixed vertical axis crossing it a distance L/4 from one of the ends. A uniform horizontal electric field is established. At first the rod is in unstable equilibrium. If it is slightly disturbed from this position, the max. velocity attained by the ball which is closer to the axis in subsequent motion is? |
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| 2. |
A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the edges of the slit is. |
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Answer» A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the edges of the slit is. |
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| 3. |
A long spring is stretched by 2 cm. Its potential energy is U. If the spring is stretched by 10 cm, its potential energy would be |
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Answer» A long spring is stretched by 2 cm. Its potential energy is U. If the spring is stretched by 10 cm, its potential energy would be |
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| 4. |
The harmonic wave yi = (2.0 × 10−3) cos π (2.0 x −50t) travels along a string toward a boundary at x = 0 with a second string. The wave speed on the second string is 50 m/s. What are the expressions for reflected and transmitted waves. Assume SI units |
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Answer» The harmonic wave yi = (2.0 × 10−3) cos π (2.0 x −50t) travels along a string toward a boundary at x = 0 with a second string. The wave speed on the second string is 50 m/s. What are the expressions for reflected and transmitted waves. Assume SI units |
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| 5. |
WHAT DOES THE TAN THETA OF VELOCITY TIME GRAPH GIVES US. IS IT ACCELERATION OR SOMETHING ELSE |
| Answer» WHAT DOES THE TAN THETA OF VELOCITY TIME GRAPH GIVES US. IS IT ACCELERATION OR SOMETHING ELSE | |
| 6. |
102. what is the current flowing through 2 ohm resistor? |
| Answer» 102. what is the current flowing through 2 ohm resistor? | |
| 7. |
83. A helicopter is flying at 100 m and flying at 25m/s at an angle 37^° above the horizontal when a package is dropped from it . Find where does package land.and if helicopter flies at constant velocity where is it when the package lands? |
| Answer» 83. A helicopter is flying at 100 m and flying at 25m/s at an angle 37^° above the horizontal when a package is dropped from it . Find where does package land.and if helicopter flies at constant velocity where is it when the package lands? | |
| 8. |
Abar magnet of magnetic moment 1.5 J T−1lies aligned with the direction of a uniform magnetic field of 0.22T. (a) What is the amount of work required by an external torque to turnthe magnet so as to align its magnetic moment: (i) normal to thefield direction, (ii) opposite to the field direction?(b) What is the torque on the magnet in cases (i) and (ii)? |
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Answer» A
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| 9. |
In Bainbridge mass - spectrometer a potential difference of 1000 V is applied between two plates placed 1cm apart and there exist a magnetic field of B=1 T. The velocity of undeflected positive ions from the velocity selector is |
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Answer» In Bainbridge mass - spectrometer a potential difference of 1000 V is applied between two plates placed 1cm apart and there exist a magnetic field of B=1 T. The velocity of undeflected positive ions from the velocity selector is |
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| 10. |
An 8 kW, 230 V, 1200 rpm dc shunt motor has armature resistance as 0.7Ω. The field current is adjusted until on no load with a supply voltage of 250 V, the motor runs at 1250 rpm and draws armature current of 1.6 A. A load torque is then applied to the motor shaft, which causes the armature current to rise to 40 A and the speed fall to 1150 rpm. The reduction in flux per pole due to the armature reaction is____%3.06 |
Answer» An 8 kW, 230 V, 1200 rpm dc shunt motor has armature resistance as 0.7Ω. The field current is adjusted until on no load with a supply voltage of 250 V, the motor runs at 1250 rpm and draws armature current of 1.6 A. A load torque is then applied to the motor shaft, which causes the armature current to rise to 40 A and the speed fall to 1150 rpm. The reduction in flux per pole due to the armature reaction is____%
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| 11. |
For the shown figure below, calculate |T1−T2|. The surface area and length is the same for all bars. |
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Answer» For the shown figure below, calculate |T1−T2|. The surface area and length is the same for all bars. |
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| 12. |
Find the maximum force F to be applied for the system shown, so that the two blocks move together. Take g=10 m/s2. |
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Answer» Find the maximum force F to be applied for the system shown, so that the two blocks move together. Take g=10 m/s2. |
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| 13. |
Two rods A and B of the same material and length have their radii r1 and r2 respectively. When they are rigidly fixed at one end and twisted by the same couple applied at the other end, the ratio of the angle of twist at the end of A and the angle of twist at the end of B is |
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Answer» Two rods A and B of the same material and length have their radii r1 and r2 respectively. When they are rigidly fixed at one end and twisted by the same couple applied at the other end, the ratio of the angle of twist at the end of A and the angle of twist at the end of B is |
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| 14. |
Find the angle between the net acceleration vector and tangential acceleration vector for a particle moving in a circle of radius 4 m. If its speed is increasing at 3 m/s every second, at an instant when the speed of the particle is 4 m/s. |
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Answer» Find the angle between the net acceleration vector and tangential acceleration vector for a particle moving in a circle of radius 4 m. If its speed is increasing at 3 m/s every second, at an instant when the speed of the particle is 4 m/s. |
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| 15. |
The value of R in the given figure so that there is no current in the 10Ω resistor is. |
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Answer» The value of R in the given figure so that there is no current in the 10Ω resistor is |
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| 16. |
Two blocks A and B of masses m and 2m movirgsame momentum on a surface enters in a region dfrough surfaces which provides equal rerarding forceThen which will stop fir |
| Answer» Two blocks A and B of masses m and 2m movirgsame momentum on a surface enters in a region dfrough surfaces which provides equal rerarding forceThen which will stop fir | |
| 17. |
A neutron with an energy of 4.6 MeV collides with protons and is retarded. Assuming that upon each collision the neutron is deflected by 45∘ The number of collisions which will reduce its energy to 0.23 eV. nearly is (integer only.) |
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Answer» A neutron with an energy of 4.6 MeV collides with protons and is retarded. Assuming that upon each collision the neutron is deflected by 45∘ The number of collisions which will reduce its energy to 0.23 eV. nearly is |
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| 18. |
A sphere of radius 0.1 m and mass 8π kg is attached to the lower end of a steel wire of length 5.0 m and diameter 10−3 m. The wire is suspended from 5.22 m high ceiling of a room. When the sphere is made to swing as a simple pendulum, it just grazes the floor at its lowest point. Calculate the velocity of the sphere at the lowest position. Young's modulus of steel is 1.994×1011 N/m2. |
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Answer» A sphere of radius 0.1 m and mass 8π kg is attached to the lower end of a steel wire of length 5.0 m and diameter 10−3 m. The wire is suspended from 5.22 m high ceiling of a room. When the sphere is made to swing as a simple pendulum, it just grazes the floor at its lowest point. Calculate the velocity of the sphere at the lowest position. Young's modulus of steel is 1.994×1011 N/m2. |
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| 19. |
A toroid has a mean radius R equal to 20π cm and a total of 400 turns of wire carrying a current of 2.0 A. An aluminium ring at temperature 280 K inside the toroid provides the core. At this temperature magnetisation of core is 4.8×10−2Am . If the tempertaure of the aluuminium ring is raised to 320 K, what will be the magnetization? |
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Answer» A toroid has a mean radius R equal to 20π cm and a total of 400 turns of wire carrying a current of 2.0 A. An aluminium ring at temperature 280 K inside the toroid provides the core. At this temperature magnetisation of core is 4.8×10−2Am . If the tempertaure of the aluuminium ring is raised to 320 K, what will be the magnetization? |
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| 20. |
For the circuit shown, the value of current at time t=3.2 s will be (in A).[Voltage distribution V(t) is shown by Figure 1 and the circuit is shown in Figure 2] |
Answer» For the circuit shown, the value of current at time t=3.2 s will be  [Voltage distribution V(t) is shown by Figure 1 and the circuit is shown in Figure 2] |
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| 21. |
If S is stress and Y is Young’s modulus of material of a wire, the energy stored in the wire per unit volume is |
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Answer» If S is stress and Y is Young’s modulus of material of a wire, the energy stored in the wire per unit volume is |
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| 22. |
Two blocks are connected over a massless pulley as shown in the figure. The mass of block A is 10 kg and coefficient of kinetic friction is 0.2. Block A slides down the incline at constant speed. The mass of the block B (in kg) is |
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Answer» Two blocks are connected over a massless pulley as shown in the figure. The mass of block A is 10 kg and coefficient of kinetic friction is 0.2. Block A slides down the incline at constant speed. The mass of the block B (in kg) is |
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| 23. |
Radiation with energy equal to the separation energy of an electron in H− atom in first excited state, is incident on a metal electrode. Work function of the metal is equal to the separation energy of an electron in He+ ion in fourth excited state. Find the stopping potential (in V) for such arrangement ? (Answer upto one decimal point) |
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Answer» Radiation with energy equal to the separation energy of an electron in H− atom in first excited state, is incident on a metal electrode. Work function of the metal is equal to the separation energy of an electron in He+ ion in fourth excited state. Find the stopping potential (in V) for such arrangement ? |
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| 24. |
If the kinetic energy of an electron in the nth shell is x kJ/atom then its potential energy in the same shell will be(1) x kJ/atom (2) x/2 kJ/atom(3)-2x kJ/atom (4) -x/2 kJ/atom |
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Answer» If the kinetic energy of an electron in the nth shell is x kJ/atom then its potential energy in the same shell will be (1) x kJ/atom (2) x/2 kJ/atom (3)-2x kJ/atom (4) -x/2 kJ/atom |
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| 25. |
if the size of nucleus=10 to the power -15 m is scaled upto the tip of a sharp pin =10 to the power -5 m then what is the size of the atom? |
| Answer» if the size of nucleus=10 to the power -15 m is scaled upto the tip of a sharp pin =10 to the power -5 m then what is the size of the atom? | |
| 26. |
When a capillary is dipped in water, water rises to a height h. If the length of the capillary is made less than h, then |
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Answer» When a capillary is dipped in water, water rises to a height h. If the length of the capillary is made less than h, then |
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| 27. |
Figure shows two coherent sources S1 and S2 which emit sound of wavelength λ in phase. The separation between the source is 3λ. A circular wire of large radius is placed in such a way that S1S2 lies in its plane and the midpoint of S1S2 is at the centre of the wire. Find the number of angular positions θ(θ<90∘) on the wire for which constructive interference takes place. |
Answer» Figure shows two coherent sources S1 and S2 which emit sound of wavelength λ in phase. The separation between the source is 3λ. A circular wire of large radius is placed in such a way that S1S2 lies in its plane and the midpoint of S1S2 is at the centre of the wire. Find the number of angular positions θ(θ<90∘) on the wire for which constructive interference takes place.  |
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| 28. |
A rectangular film of liquid is extended from (4 cm×2 cm) to (5 cm×4 cm). If the work done is 3×10−4 J, then the value of the surface tension of the liquid is |
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Answer» A rectangular film of liquid is extended from (4 cm×2 cm) to (5 cm×4 cm). If the work done is 3×10−4 J, then the value of the surface tension of the liquid is |
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| 29. |
Question 22Look at Fig. carefully and answer the following question:(a) In which part of the sky would you see the full moon in the evening?(b) In which part of the sky would you see the crescent moon in the evening? |
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Answer» Question 22 Look at Fig. carefully and answer the following question: (a) In which part of the sky would you see the full moon in the evening? (b) In which part of the sky would you see the crescent moon in the evening?  |
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| 30. |
(3)(4)4422. A particle is in uniform circular motion with speedVo The change in magnitude of velocity when itcovers half of circular path is(2) Zero(1) V(4) 2 Vo(3) 20 |
| Answer» (3)(4)4422. A particle is in uniform circular motion with speedVo The change in magnitude of velocity when itcovers half of circular path is(2) Zero(1) V(4) 2 Vo(3) 20 | |
| 31. |
A bar is compressed to half of its original length, The magnitude of true strain produced in the deformed bar is (correct to two decimal places). |
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Answer» A bar is compressed to half of its original length, The magnitude of true strain produced in the deformed bar is |
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| 32. |
A ball is shot vertically upward from the surface of another planet. A plot of 'y' versus 't' for the ball is shown in figure where y is the height of the ball above its starting point and t = 0 at the instant the ball is shot. The figure's vertical scaling is set by ys = 30.0 m. What are the magnitudes of (a) the free-fall acceleration on the planet and (b) the initial velocity of the ball? |
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Answer» A ball is shot vertically upward from the surface of another planet. A plot of 'y' versus 't' for the ball is shown in figure where y is the height of the ball above its starting point and t = 0 at the instant the ball is shot. The figure's vertical scaling is set by ys = 30.0 m. What are the magnitudes of (a) the free-fall acceleration on the planet and (b) the initial velocity of the ball?
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| 33. |
A three phase 300 kVA, 30 kV/1 kV (Δ/Y) 50 Hz transformer has primary (hv side) resistance per phase of 0.4 Ω and secondary (Iv side) resistance per phase of 0.1 Ω. Iron loss of the transformer is 5000 W. The full load percentage efficiency of the transformer operated at unity power factor will be _____.95.14 |
Answer» A three phase 300 kVA, 30 kV/1 kV (Δ/Y) 50 Hz transformer has primary (hv side) resistance per phase of 0.4 Ω and secondary (Iv side) resistance per phase of 0.1 Ω. Iron loss of the transformer is 5000 W. The full load percentage efficiency of the transformer operated at unity power factor will be _____.
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| 34. |
An object is displaced from position →r1=^i+2^j m to →r2=2^i+4^j m under the action of force →F=(6x2^i+4y^j) N. Find the work done by this force. |
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Answer» An object is displaced from position →r1=^i+2^j m to →r2=2^i+4^j m under the action of force →F=(6x2^i+4y^j) N. Find the work done by this force. |
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| 35. |
A charge has to be divided between two solid spheres of radii R which are at a distance d from each other (d>R). What should be the value of charge which should be placed on the spheres so that the force if attraction between them is maximum. a) Q/4, 3Q/4 b)Q/3, 2Q/3 c) Q/2, Q/2 d) Q/5, 4Q/5 |
| Answer» A charge has to be divided between two solid spheres of radii R which are at a distance d from each other (d>R). What should be the value of charge which should be placed on the spheres so that the force if attraction between them is maximum. a) Q/4, 3Q/4 b)Q/3, 2Q/3 c) Q/2, Q/2 d) Q/5, 4Q/5 | |
| 36. |
51. In a resonance tube,the first and second resonance are heard at depths 22.7 cm and 70.2 cm respectively. The end correction of the pipe is |
| Answer» 51. In a resonance tube,the first and second resonance are heard at depths 22.7 cm and 70.2 cm respectively. The end correction of the pipe is | |
| 37. |
A block of mass m is kept over another block of mass 2m, Coefficient of friction between two blocks is μ and that of between lower block and the horizontal surface is zero. A horizontal force F=4/3μ mg is applied on the block of mass 2m. Acceleration of lower block is. |
| Answer» A block of mass m is kept over another block of mass 2m, Coefficient of friction between two blocks is μ and that of between lower block and the horizontal surface is zero. A horizontal force F=4/3μ mg is applied on the block of mass 2m. Acceleration of lower block is. | |
| 38. |
If 2 eV energy is needed to move an electron slowly from A to B, VA – VB is |
| Answer» If 2 eV energy is needed to move an electron slowly from A to B, VA – VB is | |
| 39. |
Two condensers C1 and C2 are connected in parallel with a battery of constant potential difference and the energies stored in them are found to be in the ratio 1 : 2. If the same condensers were now connected in series with the same battery, the ratio of the potential differences across them will be |
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Answer» Two condensers C1 and C2 are connected in parallel with a battery of constant potential difference and the energies stored in them are found to be in the ratio 1 : 2. If the same condensers were now connected in series with the same battery, the ratio of the potential differences across them will be |
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| 40. |
Work done in streatching uniform rod of length L and area of crossection A by small amount x is [Y is youngs modulus] |
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Answer» Work done in streatching uniform rod of length L and area of crossection A by small amount x is |
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| 41. |
How many wavelengths of Kr(86) arw there in one metre? (1)2348123.73 (2)1553164.13 (3)652189.63 (4)1650763.7 |
| Answer» How many wavelengths of Kr(86) arw there in one metre? (1)2348123.73 (2)1553164.13 (3)652189.63 (4)1650763.7 | |
| 42. |
A capacitor of capacitance 12 μF is joined to an AC source of frequency 200 Hz. The rms current in the circuit is 2 A. The average energy stored in the capacitor is |
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Answer» A capacitor of capacitance 12 μF is joined to an AC source of frequency 200 Hz. The rms current in the circuit is 2 A. The average energy stored in the capacitor is |
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| 43. |
Why electric field inside spherical capacitor is zero?? |
| Answer» Why electric field inside spherical capacitor is zero?? | |
| 44. |
Two small kids weighing 10 kg and 15 kg are trying to balance a see saw of total length 5 m, with fulcrum at the centre. If one of the kids is sitting at the end, the other should sit at ____________ |
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Answer» Two small kids weighing 10 kg and 15 kg are trying to balance a see saw of total length 5 m, with fulcrum at the centre. If one of the kids is sitting at the end, the other should sit at ____________ |
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| 45. |
A circular coil of radius R carries a current. Consider the magnetic field due to the coil, at a point on its axis at a distance r(r>>R) from the center. The magnitude of this magnetic field varies as |
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Answer» A circular coil of radius R carries a current. Consider the magnetic field due to the coil, at a point on its axis at a distance r(r>>R) from the center. The magnitude of this magnetic field varies as |
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| 46. |
Two particles 'A' and 'B', move with constant velocities →v1 and →v2 respectively. At the initial moment, their position vectors are →r1 and →r2 respectively. The condition for particle 'A' and 'B' for their collision is |
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Answer» Two particles 'A' and 'B', move with constant velocities →v1 and →v2 respectively. At the initial moment, their position vectors are →r1 and →r2 respectively. The condition for particle 'A' and 'B' for their collision is |
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| 47. |
Two blocks of mass 4 kg and 6 kg are placed in contact with each other on a frictionless horizontal surface. If we apply a push of 5 N on the heavier mass, the force on the lighter mass will be |
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Answer» Two blocks of mass 4 kg and 6 kg are placed in contact with each other on a frictionless horizontal surface. If we apply a push of 5 N on the heavier mass, the force on the lighter mass will be
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| 48. |
Two springs of force constant 100 N/m and 150 N/m are in series as shown. The block is pulled by a distance of 2.5 cm to the right from equilibrium position. What is the ratio of work done by the spring at left to the work done by the spring at right? |
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Answer» Two springs of force constant 100 N/m and 150 N/m are in series as shown. The block is pulled by a distance of 2.5 cm to the right from equilibrium position. What is the ratio of work done by the spring at left to the work done by the spring at right?
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| 49. |
A charged capacitor is allowed to discharge through a resistor by closing the key at the instant t=0 as shown in the figure. At the instant t=ln4 μs, the reading of the ammeter falls half the initial value. The resistance of the ammeter is equal to |
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Answer» A charged capacitor is allowed to discharge through a resistor by closing the key at the instant t=0 as shown in the figure. At the instant t=ln4 μs, the reading of the ammeter falls half the initial value. The resistance of the ammeter is equal to |
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| 50. |
A boat takes 2 hrs to travel 8km down and 8km up a river when the water is still .how much time will the boat take to make the same trip when the river starts flowing at 4km/hr Options: 2hr;3hr;2hr40min;3hr40min |
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Answer» A boat takes 2 hrs to travel 8km down and 8km up a river when the water is still .how much time will the boat take to make the same trip when the river starts flowing at 4km/hr Options: 2hr;3hr;2hr40min;3hr40min |
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