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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 particle of mass m slides along a curved-flat-curved track. The curved portions of the track are smooth. If the particle is released at the top of one of the curved portions, the particle comes to rest at flat portion of length I and of μ=μkinetic after covering a distance of |
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Answer» A particle of mass m slides along a curved-flat-curved track. The curved portions of the track are smooth. If the particle is released at the top of one of the curved portions, the particle comes to rest at flat portion of length I and of μ=μkinetic after covering a distance of
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| 2. |
If in a wire of Young's modulus Y, longitudinal strain X is produced, then the elastic potential energy stored in its unit volume will be |
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Answer» If in a wire of Young's modulus Y, longitudinal strain X is produced, then the elastic potential energy stored in its unit volume will be |
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| 3. |
There is an aeroplane taking off at the airport , at say. 800 Km/ h . You are a dog. On the runway trying to chase the shadow of the Aeroplane.take the time to be exactly noon SO that the shadow falls Vertically below the plane . How fast must you run to keep up with the shadow? |
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Answer» There is an aeroplane taking off at the airport , at say. 800 Km/ h . You are a dog. On the runway trying to chase the shadow of the Aeroplane.take the time to be exactly noon SO that the shadow falls Vertically below the plane . How fast must you run to keep up with the shadow? |
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| 4. |
Mass of a ring is non-uniformly distributed around its geometric centre. If R is radius of the ring, then a. centre of mass does not coincide with geometric centre b. Position centre of mass from the geometric centre will be x (0<x<R) c. centre of mass will be nearer to the greater mass distribution d. centre of mass may lie outside the periphery |
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Answer» Mass of a ring is non-uniformly distributed around its geometric centre. If R is radius of the ring, then a. centre of mass does not coincide with geometric centre b. Position centre of mass from the geometric centre will be x (0<x<R) c. centre of mass will be nearer to the greater mass distribution d. centre of mass may lie outside the periphery |
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| 5. |
A car covers ha;f of the total distance with speed of 20 kmph and the rest with a speed of 40 kmph.the average speed during journey is(in Kmph)?plz explain it briefly with calculations? |
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Answer» A car covers ha;f of the total distance with speed of 20 kmph and the rest with a speed of 40 kmph.the average speed during journey is(in Kmph)?plz explain it briefly with calculations? |
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| 6. |
A magnet of mass 2 kg is thrown with a velocity of 5 m/s towards a moving metal block of unknown mass. Both magnet and block are moving along a smooth horizontal surface. After the collision, the magnet sticks to the metal block. If the initial momentum of system is 48 kg.m/s and the initial velocity of COM of system is 3 m/s, then what is the magnitude of initial velocity of the metal block? |
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Answer» A magnet of mass 2 kg is thrown with a velocity of 5 m/s towards a moving metal block of unknown mass. Both magnet and block are moving along a smooth horizontal surface. After the collision, the magnet sticks to the metal block. If the initial momentum of system is 48 kg.m/s and the initial velocity of COM of system is 3 m/s, then what is the magnitude of initial velocity of the metal block? |
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| 7. |
Two liquids of densities ρ1 and ρ2 are mixed in two different ways. In first case, equal mass of both the liquids were mixed and the mixture density was found to be 3 kg/m3 . In second case, equal volume of both the liquids were mixed and the mixture density was found to be 5 kg/m3 . Then product of densities ρ1 and ρ2 is |
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Answer» Two liquids of densities ρ1 and ρ2 are mixed in two different ways. In first case, equal mass of both the liquids were mixed and the mixture density was found to be 3 kg/m3 . In second case, equal volume of both the liquids were mixed and the mixture density was found to be 5 kg/m3 . Then product of densities ρ1 and ρ2 is |
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| 8. |
A stone is projected vertically up from the top of a tower at a velocity 9.8 M per second it reaches the foot of the building in 4 seconds what is the height of the tower and velocity of the stone when it reaches the ground |
| Answer» A stone is projected vertically up from the top of a tower at a velocity 9.8 M per second it reaches the foot of the building in 4 seconds what is the height of the tower and velocity of the stone when it reaches the ground | |
| 9. |
A cylindrical bucket filled with water is whirled around in a vertical circle of radius r. What can be the minimum speedat the top of the path if water does not fall out from the bucket? If it continues with this speed, what normal contact force the bucket exerts on water at the lowest point of the path? |
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Answer» A cylindrical bucket filled with water is whirled around in a vertical circle of radius r. What can be the minimum speed |
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| 10. |
A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. It is sorrounded by a magnetic field B which is constant in time and space and is pointing perpendicularly into the plane of the loop. The current induced in the loop is |
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Answer» A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. It is sorrounded by a magnetic field B which is constant in time and space and is pointing perpendicularly into the plane of the loop. The current induced in the loop is
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| 11. |
If a unit vector is represented by 0.5 ^i+0.8 ^j+c ^k , then the value of ‘c′ is |
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Answer» If a unit vector is represented by 0.5 ^i+0.8 ^j+c ^k , then the value of ‘c′ is |
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| 12. |
How cathode rays produce x-ray |
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Answer» How cathode rays produce x-ray |
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| 13. |
A bullet passes past a person at a speed of 220 m/s. Find the fractional change in the frequency of the whistling sound heard by the person as the bullet crosses the person. Speed of sound in air =330 m/s. |
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Answer» A bullet passes past a person at a speed of 220 m/s. Find the fractional change in the frequency of the whistling sound heard by the person as the bullet crosses the person. Speed of sound in air =330 m/s. |
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| 14. |
What is magnification Related some problems? |
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Answer» What is magnification Related some problems? |
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| 15. |
Three point masses of mass m each are placed on the vertex of equilateral triangle of side L in a gravity free region. Each point mass is given same speed V in such a way that separation between them does not change, then V is |
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Answer» Three point masses of mass m each are placed on the vertex of equilateral triangle of side L in a gravity free region. Each point mass is given same speed V in such a way that separation between them does not change, then V is |
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| 16. |
What is the angular velocity in rad/s of a fly wheel making 300 r.p.m? |
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Answer» What is the angular velocity in rad/s of a fly wheel making 300 r.p.m? |
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| 17. |
A small object is 2cm below the concave meniscus of water in a test tube.the radius of meniscus is5 mm and refractive index for water is 4/3.Find the nature and position of the image. |
| Answer» A small object is 2cm below the concave meniscus of water in a test tube.the radius of meniscus is5 mm and refractive index for water is 4/3.Find the nature and position of the image. | |
| 18. |
A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective so that final image is formed at the least distance vision (20 cm). |
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Answer» A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective so that final image is formed at the least distance vision (20 cm). |
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| 19. |
What do we actually try to do by rotating the knob in the radio for setting a particular station ? |
| Answer» What do we actually try to do by rotating the knob in the radio for setting a particular station ? | |
| 20. |
A particle moves along parabolic path y=2x-x2 +2 in such a way that the x component of velocity vector remains constant(5m/s). Find the magnitude of acceleration of the particle. |
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Answer» A particle moves along parabolic path y=2x-x2 +2 in such a way that the x component of velocity vector remains constant(5m/s). Find the magnitude of acceleration of the particle. |
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| 21. |
As shown in figure, two light springs of force constant 300 N/m and 600 N/m oscillate a block of mass 10 kg. Find the effective force constant. |
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Answer» As shown in figure, two light springs of force constant 300 N/m and 600 N/m oscillate a block of mass 10 kg. Find the effective force constant. |
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| 22. |
An electric current is flowing in a long straight wire. The magnetic field due to this current a distance of 5 cm from the wire is 10 T. The magnetic field at a distance of 10 cm from the wire is |
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Answer» An electric current is flowing in a long straight wire. The magnetic field due to this current a distance of 5 cm from the wire is 10 T. The magnetic field at a distance of 10 cm from the wire is |
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| 23. |
A rocket of mass 3500 kg has to achieve a velocity of 1000 m/s over a launch time of 10 minutes. The nozzle of the rocket is designed to let out exhaust gases at a velocity of 300 m/s w.r.t the rocket. What is the amount of fuel that is consumed during the launch? |
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Answer» A rocket of mass 3500 kg has to achieve a velocity of 1000 m/s over a launch time of 10 minutes. The nozzle of the rocket is designed to let out exhaust gases at a velocity of 300 m/s w.r.t the rocket. What is the amount of fuel that is consumed during the launch? |
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| 24. |
7. If the electric field at any point is zero, will it mean that the potential will also be zero at that point? Explain. |
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Answer» 7. If the electric field at any point is zero, will it mean |
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| 25. |
A trolley of mass M oscillates with some time period about its mean position when it is connected with an ideal spring of stiffness constant K. If an unknown mass m is gently placed at the top of trolley, its time period is found to be T.Calculate the coefficient of static friction so that the upper mass does not slip even for sizeable amplitude A. |
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Answer» A trolley of mass M oscillates with some time period about its mean position when it is connected with an ideal spring of stiffness constant K. If an unknown mass m is gently placed at the top of trolley, its time period is found to be T.Calculate the coefficient of static friction so that the upper mass does not slip even for sizeable amplitude A.
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| 26. |
A hollow smooth uniform sphere A of mass ′m′ rolls without sliding on a smooth horizontal surface. It collides elastically and head on with another stationary smooth solid sphere B of the same mass m and same radius. The ratio of kinetic energy of ′B′ to that of ′A′ just after the collision is 3:n where n is |
Answer» A hollow smooth uniform sphere A of mass ′m′ rolls without sliding on a smooth horizontal surface. It collides elastically and head on with another stationary smooth solid sphere B of the same mass m and same radius. The ratio of kinetic energy of ′B′ to that of ′A′ just after the collision is 3:n where n is 
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| 27. |
The following velocity-time graph depicts the motion of a vehicle. During what part of the motion was the vehicle experiencing negative acceleration? |
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Answer» The following velocity-time graph depicts the motion of a vehicle. During what part of the motion was the vehicle experiencing negative acceleration? |
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| 28. |
Tension on an almost massless rope being pulled by two boys, one small and one big, will be |
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Answer» Tension on an almost massless rope being pulled by two boys, one small and one big, will be |
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| 29. |
A particle starts from rest and travels a distance l with uniform acceleration, then moves uniformly over a further distance 2l and finally comes to rest after moving a further distance 3l under uniform retardation. Assuming entire motion to be rectilinear motion the ratio of average speed over the journey to the maximum speed on its ways is |
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Answer» A particle starts from rest and travels a distance l with uniform acceleration, then moves uniformly over a further distance 2l and finally comes to rest after moving a further distance 3l under uniform retardation. Assuming entire motion to be rectilinear motion the ratio of average speed over the journey to the maximum speed on its ways is |
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| 30. |
A particle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to -K/r2 , where K is a constant. The total energy of the particle is |
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Answer» A particle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to -K/r2 , where K is a constant. The total energy of the particle is |
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| 31. |
During blood transfusion the needle is inserted in a vein where the gauge pressure is 2000 Pa. At what height must the blood container be placed so that blood may just enter the vein? [Use the density of whole blood from Table 10.1]. |
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Answer» During blood transfusion the needle is inserted in a vein where the gauge pressure is 2000 Pa. At what height must the blood container be placed so that blood may just enter the vein? [Use the density of whole blood from Table 10.1]. |
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| 32. |
A body is falling freely under gravity. The distances covered by it in the first, second and third seconds of its motion are in the ratio |
| Answer» A body is falling freely under gravity. The distances covered by it in the first, second and third seconds of its motion are in the ratio | |
| 33. |
A vehicle travelling with a speed of 18 km/hr comes to a halt in another 10 m travel. Calculate : (a) its retardation (b) the time within which it stops. |
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Answer» A vehicle travelling with a speed of 18 km/hr comes to a halt in another 10 m travel. Calculate : (a) its retardation (b) the time within which it stops. |
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| 34. |
A thief is running away on a straight road in a jeep moving with a speed of 9 ms−1. A policeman chases him on a motor cycle moving at a speed of 10 ms−1. If the instantaneous separation of the jeep from the motor cycle is 100 m, how long will it take for the policeman to catch the thief? |
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Answer» A thief is running away on a straight road in a jeep moving with a speed of 9 ms−1. A policeman chases him on a motor cycle moving at a speed of 10 ms−1. If the instantaneous separation of the jeep from the motor cycle is 100 m, how long will it take for the policeman to catch the thief? |
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| 35. |
Find the decrease in the volume of a sample of water from the following data. Initial volume = 1000 cm3, initial pressure =105 N m−2 final pressure =106Nm−2, compressibility of water =50×10−11m2N−1, |
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Answer» Find the decrease in the volume of a sample of water from the following data. Initial volume = 1000 cm3, initial pressure =105 N m−2 final pressure =106Nm−2, compressibility of water =50×10−11m2N−1, |
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| 36. |
In the figure, all pulleys are massless and strings are light. Take g=10 ms−2 Column-IColumn-II(a) 1 kg block(p) will remain stationary(b) 2 kg block(q) will move down(c) 3 kg block(r) will move up(d) 4 kg block(s) 5 m/s2(t) 10 m/s2 |
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Answer» In the figure, all pulleys are massless and strings are light. Take g=10 ms−2 |
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| 37. |
Which of the following is true |
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Answer» Which of the following is true |
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| 38. |
Half mole of an ideal gas (y=53) is taken through the cycle abcda as shown in figure. Take R = 253 JK−1mol−1 (a) Frnd the temperature of the gas in the states a, b, c, and d. (b) Find the amount of heat supplied in the processes ab and bc. (c) Find the amount of heat liberated in the processes cd and da. |
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Answer» Half mole of an ideal gas (y=53) is taken through the cycle abcda as shown in figure. Take R = 253 JK−1mol−1 (a) Frnd the temperature of the gas in the states a, b, c, and d. (b) Find the amount of heat supplied in the processes ab and bc. (c) Find the amount of heat liberated in the processes cd and da.
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| 39. |
A bullet of mass 10×10−3 kg moving with a speed of 20 ms−1 hits an ice block (0∘C) of mass 990 g kept at rest on a frictionless floor and gets embedded in it. If ice takes 50% of K.E lost by the system, the amount of ice melted (in grams) approximately is (Latent heat of ice =80 cal/g) |
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Answer» A bullet of mass 10×10−3 kg moving with a speed of 20 ms−1 hits an ice block (0∘C) of mass 990 g kept at rest on a frictionless floor and gets embedded in it. If ice takes 50% of K.E lost by the system, the amount of ice melted (in grams) approximately is |
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| 40. |
The root mean square speed of a gas molecule at 20 ∘C is v. If the temperature of the gas is raised by 10 ∘C, then the root mean square speed of the gas molecule will be |
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Answer» The root mean square speed of a gas molecule at 20 ∘C is v. If the temperature of the gas is raised by 10 ∘C, then the root mean square speed of the gas molecule will be |
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| 41. |
A galvanometer having a resistance of 8Ω is shunted by a wire of resistance 2Ω. If the total current is 1 ampere, the part of it passing through the shunt will be |
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Answer» A galvanometer having a resistance of 8Ω is shunted by a wire of resistance 2Ω. If the total current is 1 ampere, the part of it passing through the shunt will be |
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| 42. |
Figure shows a vertical cylindrical vessel separated in two parts by a frictionless piston free to move along the length of the vessel. The length of the cylinder is 90 cm and the piston divides the cylinder in the ratio of 5:4. Each of the two parts of the vessel contains 0.1 mole of an ideal gas. The temperature of the gas is 300 K in each part. Calculate the mass of the piston |
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Answer» Figure shows a vertical cylindrical vessel separated in two parts by a frictionless piston free to move along the length of the vessel. The length of the cylinder is 90 cm and the piston divides the cylinder in the ratio of 5:4. Each of the two parts of the vessel contains 0.1 mole of an ideal gas. The temperature of the gas is 300 K in each part. Calculate the mass of the piston
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| 43. |
A ball is thrown vertically upward from a height of 40 m and hits the ground with a speed that is three times it's initial speed. What is the time taken (in sec.) for the fall? |
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Answer» A ball is thrown vertically upward from a height of 40 m and hits the ground with a speed that is three times it's initial speed. What is the time taken (in sec.) for the fall? |
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| 44. |
The retardation of a body projected vertically upwards with a certain velocity is how much.. explain |
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Answer» The retardation of a body projected vertically upwards with a certain velocity is how much.. explain |
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| 45. |
Find the dimensions of Planck's Constant 'h' from the equation E=hv where E is the energy and v is the frequency |
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Answer» Find the dimensions of Planck's Constant 'h' from the equation E=hv where E is the energy and v is the frequency |
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| 46. |
Two rain drops reach the earth with different terminal velocities having ratio 9:4. Then the ratio of their volumes is |
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Answer» Two rain drops reach the earth with different terminal velocities having ratio 9:4. Then the ratio of their volumes is |
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| 47. |
If for H2 gas, cp−cv=a and for O2 gas cp−cv=b, where cp and cv are specific heat in cal/g.K, then select the correct relation between a & b. |
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Answer» If for H2 gas, cp−cv=a and for O2 gas cp−cv=b, where cp and cv are specific heat in cal/g.K, then select the correct relation between a & b. |
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| 48. |
A uniform thin rod of length 10 m is placed along x- axis such that one of its ends is at the origin. The linear mass density of the rod varies with respect to distance from the end as λ=l0x, where l0 is a constant. Then the position of the centre of mass of the rod w.r.t the origin will be: |
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Answer» A uniform thin rod of length 10 m is placed along x- axis such that one of its ends is at the origin. The linear mass density of the rod varies with respect to distance from the end as λ=l0x, where l0 is a constant. Then the position of the centre of mass of the rod w.r.t the origin will be: |
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| 49. |
An engine pull a 1500kg of car on a level road at a constant speed of 5m/s against a frictional force of 500N. Calculate the power expended by the engine. What extra power has the engine to expend in order to maintain the same speed of the car up an inclined plane having a gradient of 1in 10? |
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Answer» An engine pull a 1500kg of car on a level road at a constant speed of 5m/s against a frictional force of 500N. Calculate the power expended by the engine. What extra power has the engine to expend in order to maintain the same speed of the car up an inclined plane having a gradient of 1in 10? |
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| 50. |
The AVG. Speed of a snail is 0.020miles/hr. And that of leopard is 70miles/hr. Convert this speeds in SI units |
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Answer» The AVG. Speed of a snail is 0.020miles/hr. And that of leopard is 70miles/hr. Convert this speeds in SI units |
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