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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. |
What is the difference between time-speed and time-velocity graph ? In what condition, they are similar ? |
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Answer» What is the difference between time-speed and time-velocity graph ? In what condition, they are similar ? |
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| 2. |
It is required to construct a 10microF capacitor which can be connected across a 200V battery.Capacitors of capacitance 10microF are available but they can withstand only 50V. Design a combination which can yield the desired result |
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Answer» It is required to construct a 10microF capacitor which can be connected across a 200V battery.Capacitors of capacitance 10microF are available but they can withstand only 50V. Design a combination which can yield the desired result |
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| 3. |
An electric bulb is designed to consume 55 W when operated at 110 volts. It is connected to a 220 V, 50 Hz line through a choke coil in series. What should be the inductance of the coil for which the bulb gets correct voltage ? |
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Answer» An electric bulb is designed to consume 55 W when operated at 110 volts. It is connected to a 220 V, 50 Hz line through a choke coil in series. What should be the inductance of the coil for which the bulb gets correct voltage ? |
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| 4. |
A standing wave is represented by y=asin(0.05x)cos(100t), where t is in s and x is in m, then the velocity of the constituent wave is |
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Answer» A standing wave is represented by y=asin(0.05x)cos(100t), where t is in s and x is in m, then the velocity of the constituent wave is |
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| 5. |
Two point charges of 50 microC and 20 microC are separated by a distance of 2 m. Find the point on the line joining them at which electric field intensity is zero |
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Answer» Two point charges of 50 microC and 20 microC are separated by a distance of 2 m. Find the point on the line joining them at which electric field intensity is zero |
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| 6. |
Find the displacement of a particle in time 0 to 10 s whose velocity versus time graph is shown below. |
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Answer» Find the displacement of a particle in time 0 to 10 s whose velocity versus time graph is shown below. |
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| 7. |
The photoelectric emission requires a threshold frequency ϑ0 for a certain metal. If incident photons has wavelengths λ1 = 2200Å and λ2 = 1900 Å produce two photoelectrons with KE1 and KE2 respectively and if KE1 = 2KE2 then |
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Answer» The photoelectric emission requires a threshold frequency ϑ0 for a certain metal. If incident photons has wavelengths λ1 = 2200Å and λ2 = 1900 Å produce two photoelectrons with KE1 and KE2 respectively and if KE1 = 2KE2 then |
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| 8. |
Why is electric field due to negative charge directed towards itself? |
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Answer» Why is electric field due to negative charge directed towards itself? |
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| 9. |
The root mean square speed of the molecules of a gas at absolute temperature T is proportional to |
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Answer» The root mean square speed of the molecules of a gas at absolute temperature T is proportional to |
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| 10. |
2 equal masses separated by a distance d attract each other with a force F. If one unit mass is transferred from one of them to the other, what happens to the force? |
| Answer» 2 equal masses separated by a distance d attract each other with a force F. If one unit mass is transferred from one of them to the other, what happens to the force? | |
| 11. |
An express train is moving with a velocity v1. Its driver finds another train is moving on the same track in the same direction with velocity v2 (v2<v1). To escape collision, driver applies a retardation a on the train. The minimum time to escape the collision is |
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Answer» An express train is moving with a velocity v1. Its driver finds another train is moving on the same track in the same direction with velocity v2 (v2<v1). To escape collision, driver applies a retardation a on the train. The minimum time to escape the collision is |
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| 12. |
Two blocks B1 and B2 of masses m1 and m2 respectively are connected with the help of a pulley and string as shown. Upper surface of vehicle is smooth but vertical surface is rough. Given a=g7 and m1=7.5m2. If B1 and B2 are at rest wrt vehicle, coefficient of friction between block B2 and side of vehicle is |
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Answer» Two blocks B1 and B2 of masses m1 and m2 respectively are connected with the help of a pulley and string as shown. Upper surface of vehicle is smooth but vertical surface is rough. |
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| 13. |
Four massless springs whose force constants are 2k,2k,k and 2k respectively are attached to a mass M kept on a frictionless plane (as shown in figure). If the mass M is displaced slightly in the horizontal direction, then the frequency of oscillation of the system is, |
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Answer» Four massless springs whose force constants are 2k,2k,k and 2k respectively are attached to a mass M kept on a frictionless plane (as shown in figure). If the mass M is displaced slightly in the horizontal direction, then the frequency of oscillation of the system is,
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| 14. |
Here is a combination of three identical capacitors. If resultant capacitance is 1 μF, calculate capacitance of each capacitor. |
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Answer» Here is a combination of three identical capacitors. If resultant capacitance is |
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| 15. |
Moment of inertia of two spheres of equal radii are equal. One of the spheres is solid and has the mass 5 kg and the other is a hollow sphere. What is the mass of hollow sphere? |
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Answer» Moment of inertia of two spheres of equal radii are equal. One of the spheres is solid and has the mass 5 kg and the other is a hollow sphere. What is the mass of hollow sphere? |
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| 16. |
If the distance between the earth and the sun were half its present value, the number of days in a year would have been |
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Answer» If the distance between the earth and the sun were half its present value, the number of days in a year would have been |
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| 17. |
What is a translatory motion? |
| Answer» What is a translatory motion? | |
| 18. |
Three particles, each of mass m, are placed at the corners of a right-angled triangle as shown in the figure. If OA = a and OB = b, the position vector of the centre of mass is |
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Answer» Three particles, each of mass m, are placed at the corners of a right-angled triangle as shown in the figure. If OA = a and OB = b, the position vector of the centre of mass is |
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| 19. |
4 die are rolled.The number of ways by which we can get atleast one 3. |
| Answer» 4 die are rolled.The number of ways by which we can get atleast one 3. | |
| 20. |
The velocity-time graph of a particle moving in a straight line is as shown in figure, initial velocity of particle is zero. Find the total displacement of the particle during its journey. |
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Answer» The velocity-time graph of a particle moving in a straight line is as shown in figure, initial velocity of particle is zero. Find the total displacement of the particle during its journey. |
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| 21. |
A horizontal platform with an object placed on it is executing S.H.M. in the vertical direction. The amplitude of oscillation is 3.92x10−3. What must be the least period of these oscillations, so that the object is not detached from the platform |
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Answer» A horizontal platform with an object placed on it is executing S.H.M. in the vertical direction. The amplitude of oscillation is 3.92x10−3. What must be the least period of these oscillations, so that the object is not detached from the platform |
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| 22. |
The energy of a photon of light with wavelength 5000∘A is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1∘A would be |
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Answer» The energy of a photon of light with wavelength 5000∘A is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1∘A would be |
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| 23. |
The relation between the gas pressure P and average kinetic energy per unit volume E is |
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Answer» The relation between the gas pressure P and average kinetic energy per unit volume E is
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| 24. |
In order to make the effective acceleration due to gravity equal to zero at the equator, the angular velocity of rotation of the earth about its axis should be (g=10 ms−2 and radius of earth is 6400 km) |
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Answer» In order to make the effective acceleration due to gravity equal to zero at the equator, the angular velocity of rotation of the earth about its axis should be (g=10 ms−2 and radius of earth is 6400 km) |
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| 25. |
A harmonic wave has been set up on a very long string which travels along the length of string. The wave has frequency of 50 Hz, amplitude 1 cm and wavelength 0.5 m. For the above described wave. Statement I: Time taken by wave to travel a distance of 8 m along the length of string is 0.32 s. Statement II: Time taken by a point on the string to travel a distance of 8 m, once the wave has reached at that point and sets it into motion is 0.32 s. |
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Answer» A harmonic wave has been set up on a very long string which travels along the length of string. The wave has frequency of 50 Hz, amplitude 1 cm and wavelength 0.5 m. For the above described wave. |
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| 26. |
Three glass cylinders of equal height H=30 cm and same refractive index n=1.5 are placed on a horizontal surface as shown in figure. Cylinder I has a flat top, cylinder II has a convex top and cylinder III has a concave top. The radii of curvature of the two curved tops are same (R = 3 m ). If H1,H2 and H3 are the apparent depths of a point X on the bottom of the three cylinders respectively, the correct statement(s) is/are |
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Answer» Three glass cylinders of equal height H=30 cm and same refractive index n=1.5 are placed on a horizontal surface as shown in figure. Cylinder I has a flat top, cylinder II has a convex top and cylinder III has a concave top. The radii of curvature of the two curved tops are same (R = 3 m ). If H1,H2 and H3 are the apparent depths of a point X on the bottom of the three cylinders respectively, the correct statement(s) is/are |
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| 27. |
Two charged particles, having equal charges of 2.0×10−5C each , are brought from nfinity to within a separation of 10 cm. Find the increase in the electric potential energy during the process. |
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Answer» Two charged particles, having equal charges of 2.0×10−5C each , are brought from nfinity to within a separation of 10 cm. Find the increase in the electric potential energy during the process. |
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| 28. |
A particle of mass m and charge q is projected into a region having a perpendicular magnetic field B. Find the angle of deviation (figure 34.E14) of the particle as it comes out of the magnetic field if the width d of the region is very slightly smaller than (a)mvqB (b)mv2qB (c)2mvqB |
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Answer» A particle of mass m and charge q is projected into a region having a perpendicular magnetic field B. Find the angle of deviation (figure 34.E14) of the particle as it comes out of the magnetic field if the width d of the region is very slightly smaller than (a)mvqB (b)mv2qB (c)2mvqB
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| 29. |
A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from x = a to x = b. The minimum value of v required so that the particle can just enter the region x > b is |
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Answer» A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from x = a to x = b. The minimum value of v required so that the particle can just enter the region x > b is |
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| 30. |
The electric current in a charging R-C circuit is given by i= i0e−1/RC where i0, R and C are constant parameters of the circuit and t is time. Find the rate of change of current at (a) t=0, (b) t = RC, (c) t = 10 RC. |
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Answer» The electric current in a charging R-C circuit is given by i= i0e−1/RC where i0, R and C are constant parameters of the circuit and t is time. Find the rate of change of current at (a) t=0, (b) t = RC, (c) t = 10 RC. |
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| 31. |
A block of mass 'm' is placed on a triangular block of mass 'M', which in turn is placed on a horizontal smooth surface as shown in figure. Assuming frictionless surfaces, find the velocity of the triangular block when the smaller block reaches the bottom end. |
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Answer» A block of mass 'm' is placed on a triangular block of mass 'M', which in turn is placed on a horizontal smooth surface as shown in figure. Assuming frictionless surfaces, find the velocity of the triangular block when the smaller block reaches the bottom end. |
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| 32. |
What does "u" denote in projectile motion? |
| Answer» What does "u" denote in projectile motion? | |
| 33. |
The electric field 10 cm from a long wire is 2.4 kN/C. If wire carries uniform charge, what will be the field strength at 40 cm from the wire? |
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Answer» The electric field 10 cm from a long wire is 2.4 kN/C. If wire carries uniform charge, what will be the field strength at 40 cm from the wire? |
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| 34. |
A uniform rod of mass m, length l is placed at rest on a smooth horizontal surface along y− axis as shown in figure. An impulsive force F is applied for a very small time interval Δt along x direction at point A. What will be the x− coordinate of the end A of the rod when the rod becomes parallel to x− axis for the first time? Take origin at the mid point of the rod. |
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Answer» A uniform rod of mass m, length l is placed at rest on a smooth horizontal surface along y− axis as shown in figure. An impulsive force F is applied for a very small time interval Δt along x direction at point A. What will be the x− coordinate of the end A of the rod when the rod becomes parallel to x− axis for the first time? Take origin at the mid point of the rod. |
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| 35. |
A man is drawing water from a well of depth 10 m using a bucket with hole in it, such that only half of the water remains when bucket arrives at top of the well. When bucket is full of water, its mass is 40 kg and pulling rate of bucket is constant. The work done by man in kilo joules to pull bucket up is ( g = 10 m/ s2) [ Neglect weight of the bucket.] |
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Answer» A man is drawing water from a well of depth 10 m using a bucket with hole in it, such that only half of the water remains when bucket arrives at top of the well. When bucket is full of water, its mass is 40 kg and pulling rate of bucket is constant. The work done by man in kilo joules to pull bucket up is |
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| 36. |
If C is the center and A,B are two points on the conic 4x2 + 9y2 -8x -36y +4=0 ∠ ACB =π2 , then CA−2 + CB−2 + 2336 = ___ |
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Answer» If C is the center and A,B are two points on the conic 4x2 + 9y2 -8x -36y +4=0 |
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| 37. |
Three rods made of same material and having the same cross section have been joined as shown in the fiugure. Each rod is of the same length. The left and right ends are kept at 0∘C and 90∘C, respectively. The temperature of the junction of the three rods will be (Write upto two digits after the decimal point.) |
Answer» Three rods made of same material and having the same cross section have been joined as shown in the fiugure. Each rod is of the same length. The left and right ends are kept at 0∘C and 90∘C, respectively. The temperature of the junction of the three rods will be
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| 38. |
A circular disc of mass 300 gm and radius 20 cm can rotate freely about a vertical axis passing through is center O. A small insect of mass 100 gm is initially at a point A on the rim. The insect initially stationary starts walking from rest along the rim of disc with such a time varying relative velocity that the disc rotates in the opposite direction with a constant angular acceleration = 2πrad/s2. After some time T, the insect is back at the point A . What is the time taken by insect to reach the original position? |
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Answer» A circular disc of mass 300 gm and radius 20 cm can rotate freely about a vertical axis passing through is center O. A small insect of mass 100 gm is initially at a point A on the rim. The insect initially stationary starts walking from rest along the rim of disc with such a time varying relative velocity that the disc rotates in the opposite direction with a constant angular acceleration = 2πrad/s2. After some time T, the insect is back at the point A . What is the time taken by insect to reach the original position? |
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| 39. |
There is no change in the volume of a wire due to change in its length on stretching. The Poisson’s ratio of the material of the wire is |
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Answer» There is no change in the volume of a wire due to change in its length on stretching. The Poisson’s ratio of the material of the wire is |
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| 40. |
A particle of mass 10−3 kg and charge 1.0 C, is initially at rest. At time t=0, the particle comes under the influence an electric field E(t)=E0sin(ωt)^i where E0=1.0 N/C and ω=103 rad/s . Consider the effect of only the electrical force on the particle. Then the maximum speed, in m/s , attained by the particle at subsequent times is |
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Answer» A particle of mass 10−3 kg and charge 1.0 C, is initially at rest. At time t=0, the particle comes under the influence an electric field E(t)=E0sin(ωt)^i where E0=1.0 N/C and ω=103 rad/s . Consider the effect of only the electrical force on the particle. Then the maximum speed, in m/s , attained by the particle at subsequent times is |
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| 41. |
A small block slides along a path which is smooth until the block reaches the section of length L = 3m, which begins at height h = 3m on a flat incline of angle 37∘, as shown in the figure. In that section, the coefficient of kinetic friction is 0.50. The block passes through point A with a speed of √136 m/s. Find the speed (in m/s) of the block as it passes through point B where the friction ends. (g=10m/s2) ___ |
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Answer» A small block slides along a path which is smooth until the block reaches the section of length L = 3m, which begins at height h = 3m on a flat incline of angle 37∘, as shown in the figure. In that section, the coefficient of kinetic friction is 0.50. The block passes through point A with a speed of √136 m/s. Find the speed (in m/s) of the block as it passes through point B where the friction ends. (g=10m/s2) |
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| 42. |
A cylinder rests in a supporting carriage as shown. The side AB of carriage makes an angle 30∘ with the horizontal and side BC is vertical. The carriage lies on a fixed horizontal surface and is being pulled towards left with a horizontal acceleration ‘a’. The magnitude of normal reactions exerted by sides AB and BC of carriage on the cylinder be NAB and NBCrespectively. Neglect friction everywhere. Then as the magnitude of acceleration ‘a’ of the carriage is increased, choose the correct statement: |
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Answer» A cylinder rests in a supporting carriage as shown. The side AB of carriage makes an angle 30∘ with the horizontal and side BC is vertical. The carriage lies on a fixed horizontal surface and is being pulled towards left with a horizontal acceleration ‘a’. The magnitude of normal reactions exerted by sides AB and BC of carriage on the cylinder be NAB and NBCrespectively. Neglect friction everywhere. Then as the magnitude of acceleration ‘a’ of the carriage is increased, choose the correct statement:
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| 43. |
A transformer is used to light 100 W – 110 V lamp from 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is |
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Answer» A transformer is used to light 100 W – 110 V lamp from 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is |
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| 44. |
Following are the least counts of vernier callipers. Which of them is most accurate? |
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Answer» Following are the least counts of vernier callipers. Which of them is most accurate? |
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| 45. |
A cylinder of height H and diameter H4 is kept on a frictional turn table as shown in figure. The axis of cylinder is perpendicular to the surface of table and the distance of axis of cylinder is 2H from centre of table. The angular speed of turn table at which the cylinder will start toppling (assume that friction is sufficient to prevent slipping). |
Answer» A cylinder of height H and diameter H4 is kept on a frictional turn table as shown in figure. The axis of cylinder is perpendicular to the surface of table and the distance of axis of cylinder is 2H from centre of table. The angular speed of turn table at which the cylinder will start toppling (assume that friction is sufficient to prevent slipping). |
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| 46. |
The network shown in the figure is part of a complete circuit. If at a certain instant, the current i is 5 A and decreasing at a rate of 103 As−1 then potential difference between A and B (VB−VA ) is equal to |
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Answer» The network shown in the figure is part of a complete circuit. If at a certain instant, the current i is 5 A and decreasing at a rate of 103 As−1 then potential difference between A and B (VB−VA ) is equal to |
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| 47. |
A source of sound S has a frequency f. Wind is blowing from source to observer O with velocity u. If speed of sound with respect to air is C, the wavelength of sound detected by O is: |
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Answer» A source of sound S has a frequency f. Wind is blowing from source to observer O with velocity u. If speed of sound with respect to air is C, the wavelength of sound detected by O is: |
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| 48. |
The following truth table corresponds to the logic gate A 0 0 1 1 B 0 1 0 1 X 0 1 1 1 |
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Answer» The following truth table corresponds to the logic gate A 0 0 1 1 B 0 1 0 1 X 0 1 1 1 |
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| 49. |
How is a potential difference created between two points? |
| Answer» How is a potential difference created between two points? | |
| 50. |
A horizontal force, just sufficient to move a body of mass 4 kg lying on a rough horizontal surface, is applied on it. The coefficient of static and kinetic friction between the body and the surface are 0.8 and 0.6, respectively. If the force continues to act even after the block has started moving, the acceleration of the block in m/s2 is (g=10 m/s2) |
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Answer» A horizontal force, just sufficient to move a body of mass 4 kg lying on a rough horizontal surface, is applied on it. The coefficient of static and kinetic friction between the body and the surface are 0.8 and 0.6, respectively. If the force continues to act even after the block has started moving, the acceleration of the block in m/s2 is (g=10 m/s2) |
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