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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. |
For an observer on trolley, direction of projection of particle is shown in the figure, while for observer on ground ball rise vertically. The maximum height reached by ball from trolley is (take g=10 m/s2) |
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Answer» For an observer on trolley, direction of projection of particle is shown in the figure, while for observer on ground ball rise vertically. The maximum height reached by ball from trolley is (take g=10 m/s2) |
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| 2. |
A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle, of 75∘. One of the fields has a magnitude of √2×10−2T. The dipole attains stable equilibrium at an angle of 30∘ with this field. What is the magnitude of the other field? |
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Answer» A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle, of 75∘. One of the fields has a magnitude of √2×10−2T. The dipole attains stable equilibrium at an angle of 30∘ with this field. What is the magnitude of the other field? |
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| 3. |
A particle executes simple harmonic motion (amplitude = A) between x = -A and x = +A. The time taken for it to go from 0 to A2 is T1 and to go from A2 to A is T2. Then |
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Answer» A particle executes simple harmonic motion (amplitude = A) between x = -A and x = +A. The time taken for it to go from 0 to A2 is T1 and to go from A2 to A is T2. Then
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| 4. |
A rod of length L has a total charge Q distributed uniformly along its length. It is bent in th shape of a semicircle. Find the magnitude of the electric field at the centre of curvatere of he semicircle. |
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Answer» A rod of length L has a total charge Q distributed uniformly along its length. It is bent in th shape of a semicircle. Find the magnitude of the electric field at the centre of curvatere of he semicircle. |
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| 5. |
What is meant by banking of roads? |
| Answer» What is meant by banking of roads? | |
| 6. |
A block of mass m is kept on the floor of a freely falling lift. During the free fall of the lift, the block is pulled horizontally with a force of F=5 N,μs=0.1. The frictional force on the block will be |
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Answer» A block of mass m is kept on the floor of a freely falling lift. During the free fall of the lift, the block is pulled horizontally with a force of F=5 N,μs=0.1. The frictional force on the block will be |
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| 7. |
(i) Identify the part of the electromagnetic spectrum which is : (a) suitable for radar system used in aircraft navigation, (b) produced by bombarding a metal target by high speed electron. (ii) Why does a galvanometer show a momentary deflection at the time of charging or discharging a capacitor ? Write the necessary expression to explain this observation. |
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Answer» (i) Identify the part of the electromagnetic spectrum which is : (a) suitable for radar system used in aircraft navigation, (b) produced by bombarding a metal target by high speed electron. (ii) Why does a galvanometer show a momentary deflection at the time of charging or discharging a capacitor ? Write the necessary expression to explain this observation. |
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| 8. |
A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. If a force of 2.8 N is applied on the block parallel to the floor, the force of friction between the block and floor is (take g=10 ms−2) |
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Answer» A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. If a force of 2.8 N is applied on the block parallel to the floor, the force of friction between the block and floor is (take g=10 ms−2) |
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| 9. |
If isothermal bulk modulus is x times adiabatic bulk modulus, then value of x is equal to |
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Answer» If isothermal bulk modulus is x times adiabatic bulk modulus, then value of x is equal to |
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| 10. |
Find the average frictional force needed to stop a car weighing 500 kg in a distance of 25 m if the initial speed is 72 km/h. |
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Answer» Find the average frictional force needed to stop a car weighing 500 kg in a distance of 25 m if the initial speed is 72 km/h. |
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| 11. |
The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultra violet radiation. Infrared radiation will be obtained in the transition. (IIT-JEE-2001) |
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Answer» The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultra violet radiation. Infrared radiation will be obtained in the transition. (IIT-JEE-2001)
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| 12. |
Meteorite explosions in the Earth's atmosphere as large as the one that destroyed forests in Siberia, with approximately the force of a twelve-megaton nuclear blast, occur about once a century. The response of highly automated systems controlled by complex computer programs to unexpected circumstances is unpredictable. Which of the following conclusions can most properly be drawn, if the statements above are true, about a highly automated nuclear-missile defense system controlled by a complex computer program? |
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Answer» Meteorite explosions in the Earth's atmosphere as large as the one that destroyed forests in Siberia, with approximately the force of a twelve-megaton nuclear blast, occur about once a century. The response of highly automated systems controlled by complex computer programs to unexpected circumstances is unpredictable. Which of the following conclusions can most properly be drawn, if the statements above are true, about a highly automated nuclear-missile defense system controlled by a complex computer program? |
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| 13. |
What kind of energy is generally used by persons at home? Can you suggest cheaper sources of lighting in homes? |
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Answer» What kind of energy is generally used by persons at home? Can you suggest cheaper sources of lighting in homes? |
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| 14. |
In the image taken by NASA's Chandra X-ray Observatory, on the left you can see a visible-light photograph of the Whirlpool galaxy merging with a smaller, companion galaxy. The x-ray photograph of the smaller galaxy can be seen in the inset, which shows a black hole at the center and two blasts of x-ray radiation it gave out 3, and 6 million years ago (inner and outer x-ray arc respectively). How could the astrophysicists figure out the age of these radiations? |
Answer» In the image taken by NASA's Chandra X-ray Observatory, on the left you can see a visible-light photograph of the Whirlpool galaxy merging with a smaller, companion galaxy. The x-ray photograph of the smaller galaxy can be seen in the inset, which shows a black hole at the center and two blasts of x-ray radiation it gave out 3, and 6 million years ago (inner and outer x-ray arc respectively). How could the astrophysicists figure out the age of these radiations? |
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| 15. |
A boy playing on the roof of a 10m high building throws a ball with a speed of 10 m/s at an angle of 30∘ with the horizontal. How far from the throwing point will the ball be at the height of 10 m from the ground (g=10 m/s2, sin 30∘=12, cos 30∘=√32) |
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Answer» A boy playing on the roof of a 10m high building throws a ball with a speed of 10 m/s at an angle of 30∘ with the horizontal. How far from the throwing point will the ball be at the height of 10 m from the ground (g=10 m/s2, sin 30∘=12, cos 30∘=√32) |
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| 16. |
Two large metal sheets carry surface currents as shown in figure (35-E13). The current through a strip of width dl is Kdl where K is a constant.Find the magnetic field at the points P, Q and R. |
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Answer» Two large metal sheets carry surface currents as shown in figure (35-E13). The current through a strip of width dl is Kdl where K is a constant.Find the magnetic field at the points P, Q and R.
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| 17. |
What are the dimensions of Stefan’s constant? |
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Answer» What are the dimensions of Stefan’s constant? |
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| 18. |
Two trains ,each having a speed of 30km/h,are headed at each other on same track.A bird flies off one train to another with a constant speed of 60km/h when they are 60km apart till before they crash.the distance covered by the bird A.20km B.40km C.60km D.30km |
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Answer» Two trains ,each having a speed of 30km/h,are headed at each other on same track.A bird flies off one train to another with a constant speed of 60km/h when they are 60km apart till before they crash.the distance covered by the bird A.20km B.40km C.60km D.30km |
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| 19. |
Why inside a conducting sphere electric field is zero? |
| Answer» Why inside a conducting sphere electric field is zero? | |
| 20. |
The horizontal distance x and the vertical height y of a projectile at a time t are given by x=at and y=bt2+ct where a, b and c are constants. What is the magnitude of the velocity of the projectile 1 second after it is fired? |
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Answer» The horizontal distance x and the vertical height y of a projectile at a time t are given by |
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| 21. |
A car begins to move at time t=0 and then accelerates along a straight track with a velocity given by V(t)=2t2 ms–1 for 0≤t≤2, where t is time in second. After the end of acceleration, the car continues to move at a constant speed. A small block initially at rest on the floor of the car begins to slip at t=1 s and stops slipping at t=3 s. The coefficient of static and kinetic friction between the block and the floor are μs and μk respectively. Find the value of 3μsμk (g=10 ms−2) |
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Answer» A car begins to move at time t=0 and then accelerates along a straight track with a velocity given by V(t)=2t2 ms–1 for 0≤t≤2, where t is time in second. After the end of acceleration, the car continues to move at a constant speed. A small block initially at rest on the floor of the car begins to slip at t=1 s and stops slipping at t=3 s. The coefficient of static and kinetic friction between the block and the floor are μs and μk respectively. Find the value of 3μsμk (g=10 ms−2) |
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| 22. |
∫sin2xcosxdx=? |
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Answer» ∫sin2xcosxdx=? |
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| 23. |
An electric bulb rated for 500 W at 100 V is used in a circuit having a 200 V supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500 W, is |
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Answer» An electric bulb rated for 500 W at 100 V is used in a circuit having a 200 V supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500 W, is |
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| 24. |
Light of wavelength 6000∘A is incident normally on a single slit of width 24×10−5 cm. Find out the angular position of second minimum from central maxima? |
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Answer» Light of wavelength 6000∘A is incident normally on a single slit of width 24×10−5 cm. Find out the angular position of second minimum from central maxima? |
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| 25. |
A medium has relative permeability 19 and relative permittivity 25. Find critical angle for medium w.r.t. vacuum. |
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Answer» A medium has relative permeability 19 and relative permittivity 25. Find critical angle for medium w.r.t. vacuum. |
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| 26. |
Two coherent point sources s1and s2emit light of wave length λ the separation between then is 2λThe smallest distance from s2 on the line passing through s2 and perpendicular to s1s2where minimum intensity occurs is |
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Answer» Two coherent point sources s1and s2emit light of wave length λ the separation between then is 2λThe |
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| 27. |
One Kg of a diatomic gas is at a pressure of 8×104N/m2. The density of the gas is 4Kg/m3. The energy of the gas due to its thermal motion is |
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Answer» One Kg of a diatomic gas is at a pressure of 8×104N/m2. The density of the gas is 4Kg/m3. The energy of the gas due to its thermal motion is |
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| 28. |
Two metal spheres carrying charges of +8p C and -5pC attract each other with a force F.If a charge of -3pC is added to both, the force between the spheres will be |
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Answer» Two metal spheres carrying charges of +8p C and -5pC attract each other with a force F.If a charge of -3pC is added to both, the force between the spheres will be |
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| 29. |
A particle executes SHM starting from its mean position, at t=0s. If it's velocity is √3bω, when it is at a distance b from the mean position, where ω=2πT. The time taken by the particle to move from b to the extreme position on the same side is |
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Answer» A particle executes SHM starting from its mean position, at t=0s. If it's velocity is √3bω, when it is at a distance b from the mean position, where ω=2πT. The time taken by the particle to move from b to the extreme position on the same side is |
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| 30. |
A gas is enclosed in a cylinder with a movable frictionless piston. Its initial thermodynamic state at pressure Pi=105 Pa and volume Vi=10−3 Pa changes to a final state at Pf=(132)×105 Pa and Vf=8×10−3 m3 in an adiabatic quasi-static process, such that P3V5= constant. Consider another thermodynamic process that brings the system from the same initial state to the same final state in two steps : an isobaric expansion at Pi followed by an isochoric (isovolumetric) process at volume Vf. The amount of heat supplied to the system in the two-step process is approximately |
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Answer» A gas is enclosed in a cylinder with a movable frictionless piston. Its initial thermodynamic state at pressure Pi=105 Pa and volume Vi=10−3 Pa changes to a final state at Pf=(132)×105 Pa and Vf=8×10−3 m3 in an adiabatic quasi-static process, such that P3V5= constant. Consider another thermodynamic process that brings the system from the same initial state to the same final state in two steps : an isobaric expansion at Pi followed by an isochoric (isovolumetric) process at volume Vf. The amount of heat supplied to the system in the two-step process is approximately |
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| 31. |
Water is filled in a uniform container of area of cross section A. A hole of cross section area a(«A) is made in the container at a height of 20 m above the base. Water streams out and hits a small block on surface at some distance from the container. The block is moved on the surface in such a way that the stream always hits the block. The initial velocity of the block (in m/s) is (Given aA=120; Take g=10 ms−2) (answer upto two decimal places) |
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Answer» Water is filled in a uniform container of area of cross section A. A hole of cross section area a(«A) is made in the container at a height of 20 m above the base. Water streams out and hits a small block on surface at some distance from the container. The block is moved on the surface in such a way that the stream always hits the block. The initial velocity of the block (in m/s) is |
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| 32. |
Monochromatic light is refracted from air into glass of refractive index μ. The ratio of the wavelengths of incident and refracted waves is |
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Answer» Monochromatic light is refracted from air into glass of refractive index μ. The ratio of the wavelengths of incident and refracted waves is |
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| 33. |
Find the maximum magnifying power of a compound microscope having a 25 diopter lens as the objective, a 5 diopter lens as the eyepiece and the separation 30 cm between the two lenses. The least distance for clear vision is 25 cm. |
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Answer» Find the maximum magnifying power of a compound microscope having a 25 diopter lens as the objective, a 5 diopter lens as the eyepiece and the separation 30 cm between the two lenses. The least distance for clear vision is 25 cm. |
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| 34. |
All the surfaces shown in the figure are frictionless. The mass of the inclined wedge is M, that of the block is m and spring constant of the spring is k. Initially, the block and wedge are at rest. The spring is stretched by a small length and then released. Find the time period of oscillation of the system. |
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Answer» All the surfaces shown in the figure are frictionless. The mass of the inclined wedge is M, that of the block is m and spring constant of the spring is k. Initially, the block and wedge are at rest. The spring is stretched by a small length and then released. Find the time period of oscillation of the system. |
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| 35. |
The specific heat of hydrogen gas at constant pressure is CP=3.4×103cal/kg∘C and at constant volume is Cr=2.4×103 cal/kg∘C If one kilogram hydrogen gas is heated from 10∘ to 20∘ at constant pressure, the external work done on the gas to maintain it at constant pressure is |
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Answer» The specific heat of hydrogen gas at constant pressure is CP=3.4×103cal/kg∘C and at constant volume is Cr=2.4×103 cal/kg∘C If one kilogram hydrogen gas is heated from 10∘ to 20∘ at constant pressure, the external work done on the gas to maintain it at constant pressure is |
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| 36. |
Show that the direction cosines of a vector equally inclined to the axes OX, OY and OZ are 1√3,1√3,1√3 |
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Answer» Show that the direction cosines of a vector equally inclined to the axes OX, OY and OZ are 1√3,1√3,1√3 |
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| 37. |
Four persons K, L, M and N are initially at the corners of a square of side of length d. If every person starts moving, such that K is always headed towards L, L towards M, M is headed directly towards N and N towards K, then the four persons will meet after (assume that they move with a constant speed v) |
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Answer» Four persons K, L, M and N are initially at the corners of a square of side of length d. If every person starts moving, such that K is always headed towards L, L towards M, M is headed directly towards N and N towards K, then the four persons will meet after (assume that they move with a constant speed v) |
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| 38. |
A small bead of mass m moving with velocity v gets threaded on a stationary semicircular ring of mass m and radius R kept on a horizontal table. The ring can freely rotate about its centre. The bead comes to rest relative to the ring. What will be the final angular velocity of the system? |
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Answer» A small bead of mass m moving with velocity v gets threaded on a stationary semicircular ring of mass m and radius R kept on a horizontal table. The ring can freely rotate about its centre. The bead comes to rest relative to the ring. What will be the final angular velocity of the system? |
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| 39. |
A disc of mass m and radius R is free to rotate in a horizontal plane about a vertical smooth fixed axis passing through its centre. There is a smooth groove along the diameter of the disc and two small balls of mass m/2 each, are placed in it on either side of the centre of the disc as shown in the figure. The disc is given an initial angular velocity ω0 and released. The angular speed of the disc when the balls reach the end of the disc is |
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Answer» A disc of mass m and radius R is free to rotate in a horizontal plane about a vertical smooth fixed axis passing through its centre. There is a smooth groove along the diameter of the disc and two small balls of mass m/2 each, are placed in it on either side of the centre of the disc as shown in the figure. The disc is given an initial angular velocity ω0 and released. |
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| 40. |
Three are two dipoles in space with dipole moment −→P1=ˆi+2ˆj+ˆk and −→P2=2ˆi+3ˆj+ˆk. What is the net dipole moment of the arrangement? |
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Answer» Three are two dipoles in space with dipole moment −→P1=ˆi+2ˆj+ˆk and −→P2=2ˆi+3ˆj+ˆk. What is the net dipole moment of the arrangement? |
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| 41. |
During the propagation of electromagnetic waves in a medium, |
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Answer» During the propagation of electromagnetic waves in a medium, |
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| 42. |
A thin equiconvex lens of glass (μ=32) having a focal length of 30 cm in air is placed at a distance of 10 cm from a plane mirror, which, in turn is placed with its plane perpendicular to the optic axis of the lens. Water (μ=43) fills the space between lens and mirror. A parallel beam of light is incident on the lens parallel to the principal axis. Choose the correct option(s): |
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Answer» A thin equiconvex lens of glass (μ=32) having a focal length of 30 cm in air is placed at a distance of 10 cm from a plane mirror, which, in turn is placed with its plane perpendicular to the optic axis of the lens. Water (μ=43) fills the space between lens and mirror. A parallel beam of light is incident on the lens parallel to the principal axis. Choose the correct option(s):
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| 43. |
Two identical objects each of radii R and masses m1 and m2 are suspended using two strings of equal length L as shown in the figure (R<<L). The angle θ which mass m2 makes with the vertical is approximately |
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Answer» Two identical objects each of radii R and masses m1 and m2 are suspended using two strings of equal length L as shown in the figure (R<<L). The angle θ which mass m2 makes with the vertical is approximately |
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| 44. |
The acceleration of a particle is given by the a = x where x is a constant. If the particle starts at origin from rest, its distance from origin after time t is given by |
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Answer» The acceleration of a particle is given by the a = x where x is a constant. If the particle starts at origin from rest, its distance from origin after time t is given by |
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| 45. |
The wavelength of the first line of lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is: |
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Answer» The wavelength of the first line of lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is: |
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| 46. |
Separation between the plates of a parallel plate capacitor, connected to a battery (zero resistance) of constant e.m.f., is increased with constant (very slow) speed by external forces. During the process, W is the work done by external forces. If U is the change in potential energy of the capacitor, Wb is the work done by the battery and H is the heat loss in the circuit. Then |
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Answer» Separation between the plates of a parallel plate capacitor, connected to a battery (zero resistance) of constant e.m.f., is increased with constant (very slow) speed by external forces. During the process, W is the work done by external forces. If U is the change in potential energy of the capacitor, Wb is the work done by the battery and H is the heat loss in the circuit. Then |
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| 47. |
A bullet with muzzle velocity of 100 m/s is to be shot at a target 30 m away in same horizontal line. Height H above the target where the gun must be aimed so that bullet hits target is [g=10m/s2]and H is in meter (Assume the angle of projection (θ)turns out to be so small that sinθ=tanθ=θ) |
Answer» A bullet with muzzle velocity of 100 m/s is to be shot at a target 30 m away in same horizontal line. Height H above the target where the gun must be aimed so that bullet hits target is [g=10m/s2]and H is in meter
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| 48. |
Which of the following is a correct representation of the image of a P shaped object placed in front of a plane mirror? |
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Answer» Which of the following is a correct representation of the image of a P shaped object placed in front of a plane mirror? |
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| 49. |
A light beam travelling in the X-direction is described by the electric field Ey=(300 V/m)sin ω(t−x/c). An electron is constrained to move along the Y-direction with a speed of 2.0×107 m/s. Find the maximum electric force and the maximum magnetic force on the electron respectively. |
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Answer» A light beam travelling in the X-direction is described by the electric field Ey=(300 V/m)sin ω(t−x/c). An electron is constrained to move along the Y-direction with a speed of 2.0×107 m/s. Find the maximum electric force and the maximum magnetic force on the electron respectively. |
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| 50. |
In the shown AC circuit L, C and Vo are fixed. What is the value of ω such that reading of hot wire ammeter shown is independent of 'R'? |
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Answer» In the shown AC circuit L, C and Vo are fixed. What is the value of ω such that reading of hot wire ammeter shown is independent of 'R'? |
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The angular speed of the disc when the balls reach the end of the disc is
