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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 speed at the highest point of path of projectile? |
| Answer» what is the speed at the highest point of path of projectile? | |
| 2. |
Does sun rotates in its own axis? |
| Answer» Does sun rotates in its own axis? | |
| 3. |
Which one of the following is not the unit of electric charge? |
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Answer» Which one of the following is not the unit of electric charge? |
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| 4. |
A bead of mass m is fitted on a rod and can move on it without friction. Initially the bead is at the middle of the rod and the rod moves translationaly up in a vertical plane with an acceleration a0 in a direction forming an angle α with the horizontal plane. The acceleration of bead with respect to rod is |
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Answer» A bead of mass m is fitted on a rod and can move on it without friction. Initially the bead is at the middle of the rod and the rod moves translationaly up in a vertical plane with an acceleration a0 in a direction forming an angle α with the horizontal plane. The acceleration of bead with respect to rod is |
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| 5. |
A sonometer wire having a length of 1.50 m between the bridges vibrates in its second harmonic in resonance with a tuning fork of frequency 256 Hz. What is the speed of the transverse wave on the wire ? |
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Answer» A sonometer wire having a length of 1.50 m between the bridges vibrates in its second harmonic in resonance with a tuning fork of frequency 256 Hz. What is the speed of the transverse wave on the wire ? |
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| 6. |
Given that i is angle of incidence and r is angle of refraction for a light ray at a boundary, the correct expression for Snell's Law is: |
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Answer» Given that i is angle of incidence and r is angle of refraction for a light ray at a boundary, the correct expression for Snell's Law is: |
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| 7. |
A particle is moving on a circular path with constant speed V. It moves between two points A and B, which subtends an angle 60 degree at the centre of circle. Find the magnitude of change in its velocity and change in magnitude of its velocity during motion from A to B. |
| Answer» A particle is moving on a circular path with constant speed V. It moves between two points A and B, which subtends an angle 60 degree at the centre of circle. Find the magnitude of change in its velocity and change in magnitude of its velocity during motion from A to B. | |
| 8. |
A light ray falling at an angle of 45∘ with the surface of a clean slab of ice of thickness 1.00 m is refracted into it at an angle of 30∘. Calculate the time taken by the light ray to cross the slab. (Speed of light in vacuum =3×108m/s). |
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Answer» A light ray falling at an angle of 45∘ with the surface of a clean slab of ice of thickness 1.00 m is refracted into it at an angle of 30∘. Calculate the time taken by the light ray to cross the slab. (Speed of light in vacuum =3×108m/s). |
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| 9. |
A block of ice at - 10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represent the phenomenon qualitatively? |
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Answer» A block of ice at - 10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represent the phenomenon qualitatively? |
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| 10. |
An α− particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25Wb/m2. The de Broglie wavelength associated with the particle will be |
| Answer» An α− particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25Wb/m2. The de Broglie wavelength associated with the particle will be | |
| 11. |
Why stoichiometric defects is also called intrinsic or thermodynamic defects |
| Answer» Why stoichiometric defects is also called intrinsic or thermodynamic defects | |
| 12. |
s What will be theacceleration due to gravity on a planet whose mass is 4 times that of earthand identical in size? |
| Answer» s What will be theacceleration due to gravity on a planet whose mass is 4 times that of earthand identical in size? | |
| 13. |
A particle of mass m is projected with velocity v making an angle of 45∘ with the horizontal. The magnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity) |
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Answer» A particle of mass m is projected with velocity v making an angle of 45∘ with the horizontal. The magnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity) |
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| 14. |
A particle of mass 2g executes S.H.M. with a period of 12s and amplitude 10cm.Find the acceleration of the particle and the restoring force on the particle when itit is 2cm form its mean position. |
| Answer» A particle of mass 2g executes S.H.M. with a period of 12s and amplitude 10cm.Find the acceleration of the particle and the restoring force on the particle when itit is 2cm form its mean position. | |
| 15. |
is charge affected by acceleration? |
| Answer» is charge affected by acceleration? | |
| 16. |
A liquid X of density 3.36 g/cc is poured in a U− tube (containing mercury) in the right arm upto height 10 cm above the mercury level. Another liquid Y is poured in the left arm upto height 8 cm as shown in figure. Upper levels of X and Y are the same. What is the density of liquid Y? [Take ρHg=13.6 g/cc] |
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Answer» A liquid X of density 3.36 g/cc is poured in a U− tube (containing mercury) in the right arm upto height 10 cm above the mercury level. Another liquid Y is poured in the left arm upto height 8 cm as shown in figure. Upper levels of X and Y are the same. What is the density of liquid Y? [Take ρHg=13.6 g/cc] |
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| 17. |
Two solid spheres A and B made of same material have radii Ra and Rb . Both the sphere are cool from the same temp. under the condition valid for Newton's law of cooling . The rate of ratio of change of temperature A and B |
| Answer» Two solid spheres A and B made of same material have radii Ra and Rb . Both the sphere are cool from the same temp. under the condition valid for Newton's law of cooling . The rate of ratio of change of temperature A and B | |
| 18. |
The speed of a motor launch with respect to still water is 7m/sec and the speed of stream is 3m/sec . When the launch begain travelling upstream a float was dropped from it . The launch travelled 4.2km upstream turn about and caught up the float . How long it is before the launch reaches the float . |
| Answer» The speed of a motor launch with respect to still water is 7m/sec and the speed of stream is 3m/sec . When the launch begain travelling upstream a float was dropped from it . The launch travelled 4.2km upstream turn about and caught up the float . How long it is before the launch reaches the float . | |
| 19. |
With respect to a rectangular Cartesian co-ordinate system three vectors are expressed as →a=4^i−^j,→b=−3^i+2^j and →c=−^k where ^i,^j and ^k are unit vectors along the x, y and z axes respectively. The unit vector along the direction of sum of these vectors is |
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Answer» With respect to a rectangular Cartesian co-ordinate system three vectors are expressed as →a=4^i−^j,→b=−3^i+2^j and →c=−^k where ^i,^j and ^k are unit vectors along the x, y and z axes respectively. The unit vector along the direction of sum of these vectors is |
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| 20. |
The diagram showing the variation of gravitational potential of earth with distance from the centre of earth is |
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Answer» The diagram showing the variation of gravitational potential of earth with distance from the centre of earth is |
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| 21. |
A body travels half of the total path in last second of its free fall from rest. The time of flight is(g=10m/s2)(1) 1.2 (2) 6.1 s(3) 3.4s(4) 1.89 s |
| Answer» A body travels half of the total path in last second of its free fall from rest. The time of flight is(g=10m/s2)(1) 1.2 (2) 6.1 s(3) 3.4s(4) 1.89 s | |
| 22. |
62.Net resistance between M and N .if all the resistance are same |
| Answer» 62.Net resistance between M and N .if all the resistance are same | |
| 23. |
If polarization is (i+5j+2k) unit and Ex=10unit then find magnitude of electric field |
| Answer» If polarization is (i+5j+2k) unit and Ex=10unit then find magnitude of electric field | |
| 24. |
Two identical balls each having a density ρ are suspended in vacuum from a common point by two insulating strings of equal length. Both the balls have equal mass and charge. In equilibrium each string makes an angle θ with vertical. Now both the balls are immersed in a liquid, as a result the angle θ does not change. If the density of the liquid is σ, then find the dielectric constant of the liquid. |
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Answer» Two identical balls each having a density ρ are suspended in vacuum from a common point by two insulating strings of equal length. Both the balls have equal mass and charge. In equilibrium each string makes an angle θ with vertical. Now both the balls are immersed in a liquid, as a result the angle θ does not change. If the density of the liquid is σ, then find the dielectric constant of the liquid. |
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| 25. |
The color code of a carbon resistor is given belowThe resistance of the resistor will be |
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Answer» The color code of a carbon resistor is given below |
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| 26. |
In the figure shown, the velocity and pressure of the liquid at the cross-section (2) are given by (If Po is the atmospheric pressure). |
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Answer» In the figure shown, the velocity and pressure of the liquid at the cross-section (2) are given by (If Po is the atmospheric pressure). |
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| 27. |
Answer the following : (a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means ? (b) An astronaut inside a small space ship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity ? (c) If you compare the gravitational force on the earth due to the sun to that due to the moon, you would find that the Sun’s pull is greater than the moon’s pull. (you can check this yourself using the data available in the succeeding exercises). However, the tidal effect of the moon’s pull is greater than the tidal effect of sun. Why ? |
| Answer» Answer the following : (a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means ? (b) An astronaut inside a small space ship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity ? (c) If you compare the gravitational force on the earth due to the sun to that due to the moon, you would find that the Sun’s pull is greater than the moon’s pull. (you can check this yourself using the data available in the succeeding exercises). However, the tidal effect of the moon’s pull is greater than the tidal effect of sun. Why ? | |
| 28. |
If pressure is assumed to be constant, at what temperature will the rms speed of gas molecules increase by 10% of the rms speed at STP? |
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Answer» If pressure is assumed to be constant, at what temperature will the rms speed of gas molecules increase by 10% of the rms speed at STP? |
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| 29. |
14. The volume of susceptibility of a magnet material is 3/104. It's relative permeability will be? |
| Answer» 14. The volume of susceptibility of a magnet material is 3/104. It's relative permeability will be? | |
| 30. |
a stretched string is 1m long .its mass per unit length is 0.5 gram per metre .it is a stretched with a force of 20 newton It plucked at a dis†an ce of 25cm from one and the frequency of note emitted by it will be |
| Answer» a stretched string is 1m long .its mass per unit length is 0.5 gram per metre .it is a stretched with a force of 20 newton It plucked at a dis†an ce of 25cm from one and the frequency of note emitted by it will be | |
| 31. |
A plumb bob is hung from the ceiling of a train compartment. The train moves on an inclined track of inclination 30∘ with horizontal. Acceleration of train up the plane is a=g2. The angle which the string supporting the bob makes with normal to the ceiling in equilibrium is θ. Then tan θ upto 2 decimal places is |
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Answer» A plumb bob is hung from the ceiling of a train compartment. The train moves on an inclined track of inclination 30∘ with horizontal. Acceleration of train up the plane is a=g2. The angle which the string supporting the bob makes with normal to the ceiling in equilibrium is θ. Then tan θ upto 2 decimal places is |
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| 32. |
A rectangular plate of mass 20 kg is suspended from points A and B as known, if the pin B is suddenly removed, the angular acceleration in rad/s2(to the nearest integer) of the plate is α. Then α8 has value (g=10m/s2) |
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Answer» A rectangular plate of mass 20 kg is suspended from points A and B as known, if the pin B is suddenly removed, the angular acceleration in rad/s2(to the nearest integer) of the plate is α. Then α8 has value (g=10m/s2)  |
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| 33. |
If →A=3^i+^j and →B=2^i then value of |→A×→B| will be |
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Answer» If →A=3^i+^j and →B=2^i then value of |→A×→B| will be |
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| 34. |
A particle of mass m moves in the x – y plane with a velocity v along a straight line passing through points having co-ordinates (1, 3) and (3, 5) respectively. The angular momentum of the particle about point having co-ordinates (0, 2) is Options: mvZero |
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Answer» A particle of mass m moves in the x – y plane with a velocity v along a straight line passing through points having co-ordinates (1, 3) and (3, 5) respectively. The angular momentum of the particle about point having co-ordinates (0, 2) is Options: mv Zero |
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| 35. |
An electron beam of energy 10 KeV is incident on metallic foil. If the interatomic distance is 0.55Å. Find the angle of diffraction. |
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Answer» An electron beam of energy 10 KeV is incident on metallic foil. If the interatomic distance is 0.55Å. Find the angle of diffraction. |
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| 36. |
In a YDSE, a thin film (μ=1.6) of thickness 0.01 mm is introduced in the path of one of the two interfering beams. The central fringe moves to a position occupied by the 10th bright fringe earlier. The wave length of the wave is |
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Answer» In a YDSE, a thin film (μ=1.6) of thickness 0.01 mm is introduced in the path of one of the two interfering beams. The central fringe moves to a position occupied by the 10th bright fringe earlier. The wave length of the wave is |
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| 37. |
Why should an equation be balanced? |
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Answer» Why should an equation be balanced? |
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| 38. |
A vehicle is moving on a road with an acceleration a=20 .the frictional coefficient between the block of mass m and the vehicle so that block is does not fall downward |
| Answer» A vehicle is moving on a road with an acceleration a=20 .the frictional coefficient between the block of mass m and the vehicle so that block is does not fall downward | |
| 39. |
Three identical cells, each of 4 V and internal resistance r, are connected in series to a 6 ohm resistor. If the current flowing in the circuit is 2 A. The internal resistance of each cell is |
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Answer» Three identical cells, each of 4 V and internal resistance r, are connected in series to a 6 ohm resistor. If the current flowing in the circuit is 2 A. The internal resistance of each cell is |
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| 40. |
The frequency of the electromagnetic wave, which is best suited to observe a particle of radius 3 × 10−4 cm is the order of |
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Answer» The frequency of the electromagnetic wave, which is best suited to observe a particle of radius 3 × 10−4 cm is the order of |
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| 41. |
A light rod of length L can revolve in a vertical circle around point O. The rod carries two equal masses of mass m each such that one mass is connected at the end of the rod and the second mass is fixed at the middle of the rod. u is the velocity imparted to the end P to deflect the rod to the horizontal position. Again mass m in the middle of the rod is removed and mass at end P is doubled. Now v is the velocity imparted to end P to deflect it to the horizontal position. Then (uv)2 is |
Answer» A light rod of length L can revolve in a vertical circle around point O. The rod carries two equal masses of mass m each such that one mass is connected at the end of the rod and the second mass is fixed at the middle of the rod. u is the velocity imparted to the end P to deflect the rod to the horizontal position. Again mass m in the middle of the rod is removed and mass at end P is doubled. Now v is the velocity imparted to end P to deflect it to the horizontal position. Then (uv)2 is |
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| 42. |
A stone is dropped from a cliff. Find its speed after the stone has fallen from 100 m. (g=9.8m/s2) |
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Answer» A stone is dropped from a cliff. Find its speed after the stone has fallen from 100 m. (g=9.8m/s2) |
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| 43. |
Five uniform rings, each of diameter 5 cm and mass 10 g are arranged as shown in the figure. Using the origin shown, the y− co-ordinate of COM of the five ring system is |
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Answer» Five uniform rings, each of diameter 5 cm and mass 10 g are arranged as shown in the figure. Using the origin shown, the y− co-ordinate of COM of the five ring system is |
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| 44. |
The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein’s equation, the metals which will emit photo electrons for a radiation of wavelength 4100 ∘A is/are |
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Answer» The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein’s equation, the metals which will emit photo electrons for a radiation of wavelength 4100 ∘A is/are |
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| 45. |
Two identical parallel plate capacitors are connected in series to a battery of 100 V. A dielectric slab of dielectric constant 4 is inserted between the plates of the second capacitor to fill the space between its plates, completely. The potential difference across the capacitors will now be, respectively. |
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Answer» Two identical parallel plate capacitors are connected in series to a battery of 100 V. A dielectric slab of dielectric constant 4 is inserted between the plates of the second capacitor to fill the space between its plates, completely. The potential difference across the capacitors will now be, respectively. |
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| 46. |
A proton and an alpha particle are accelerated through the same potential difference. The ratio of their De-Broglie wavelengths is ? |
| Answer» A proton and an alpha particle are accelerated through the same potential difference. The ratio of their De-Broglie wavelengths is ? | |
| 47. |
In the following ray diagrams, a ray of light is incident at an equal angle of incidence at the interface of four different materials. Which material is optically densest? |
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Answer» In the following ray diagrams, a ray of light is incident at an equal angle of incidence at the interface of four different materials. Which material is optically densest? |
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| 48. |
The following diagram shows the zero error reading when the screw gauge is closed. What is the zero correction in this case? |
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Answer» The following diagram shows the zero error reading when the screw gauge is closed. What is the zero correction in this case?
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| 49. |
A mass M is moving with constant velocity parallel to x axis it's angular momentum with respect to origin (a) is zero (b) remains constant (c) goes on increasing (d) goes on decreasing |
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Answer» A mass M is moving with constant velocity parallel to x axis it's angular momentum with respect to origin (a) is zero (b) remains constant (c) goes on increasing (d) goes on decreasing |
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| 50. |
A disc of mass 100 g is kept floating horizontally in the air by firing bullets each of mass 5 g with the same velocity at the same rate of 10 bullets per second. The bullets rebound at the same speed in opposite direction. Then, the velocity of each bullet at the time of impact is: (Take g=10 m/s2) |
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Answer» A disc of mass 100 g is kept floating horizontally in the air by firing bullets each of mass 5 g with the same velocity at the same rate of 10 bullets per second. The bullets rebound at the same speed in opposite direction. Then, the velocity of each bullet at the time of impact is: (Take g=10 m/s2) |
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