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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. |
An electron is moving in a circular loop of radius10^{-7}cm with uniform velocity of 2 x 10^{12} cm/s. Theelectric current produced by this electron is (1)0.51 ampere(2)1 ampere (3) 1.5 ampere (4) 2 amper |
| Answer» An electron is moving in a circular loop of radius10^{-7}cm with uniform velocity of 2 x 10^{12} cm/s. Theelectric current produced by this electron is (1)0.51 ampere(2)1 ampere (3) 1.5 ampere (4) 2 amper | |
| 2. |
Two satellites of masses 400 kg and 500 kg are revolving around earth in different circular orbits of radii r1 and r2 such that their kinetic energies are equal. The ratio of r1 to r2 is |
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Answer» Two satellites of masses 400 kg and 500 kg are revolving around earth in different circular orbits of radii r1 and r2 such that their kinetic energies are equal. The ratio of r1 to r2 is |
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| 3. |
A stone is dropped from the top of building and at the same time a second stone is thrown vertically upward from the bottom of the building with a speed of 20 ms−1. They pass each other 3 seconds later. Find the height of the building. [Take g=10 m/s2] |
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Answer» A stone is dropped from the top of building and at the same time a second stone is thrown vertically upward from the bottom of the building with a speed of 20 ms−1. They pass each other 3 seconds later. Find the height of the building. |
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| 4. |
Find the value of −cos32π3 |
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Answer» Find the value of −cos32π3 |
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| 5. |
An infinitely long straight wire carrying current I, one side opened rectangular loop and a conductor C with a sliding connector are located in the same plane, as shown in the figure. The connector has length l and resistance R. It slides to the right with a velocity v. The resistance of the conductor and the self inductance of the loop are negligible. The induced current in the loop, as a function of separation r, between the connector and the straight wire is |
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Answer» An infinitely long straight wire carrying current I, one side opened rectangular loop and a conductor C with a sliding connector are located in the same plane, as shown in the figure. The connector has length l and resistance R. It slides to the right with a velocity v. The resistance of the conductor and the self inductance of the loop are negligible. The induced current in the loop, as a function of separation r, between the connector and the straight wire is |
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| 6. |
Mean free path is largest for the gas ____. |
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Answer» Mean free path is largest for the gas ____. |
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| 7. |
A oil drop of mass m carrying charge-q is to be held stationary in the gravitational field of the earth, what is the magnitude and direction of the electric field? |
| Answer» A oil drop of mass m carrying charge-q is to be held stationary in the gravitational field of the earth, what is the magnitude and direction of the electric field? | |
| 8. |
A semicircular wire has a length L and mass M A particle of mass m is placed at the centre of the circle. Find the gravitational attraction on the particle due to the wire. |
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Answer» A semicircular wire has a length L and mass M A particle of mass m is placed at the centre of the circle. |
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| 9. |
A block of mass 4 kg is kept on a rough horizontal surface. The coefficient of static friction is 0.8. If a force of 19 N is applied on the block parallel to the floor, then the force of friction between the block and the floor is |
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Answer» A block of mass 4 kg is kept on a rough horizontal surface. The coefficient of static friction is 0.8. If a force of 19 N is applied on the block parallel to the floor, then the force of friction between the block and the floor is |
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| 10. |
3.An object is moving with speed 10 m/s along thedirection of a vector 4i -3j. Velocity of the objectis |
| Answer» 3.An object is moving with speed 10 m/s along thedirection of a vector 4i -3j. Velocity of the objectis | |
| 11. |
A stunt driver of mass 60 kg rides a bike inside a hollow metallic sphere of radius 45 m. Assume the bike moves in the central plane of the sphere. If the coefficient of static friction between the wheels of the bike and the metal surface is 0.8, what must be the minimum speed of the driver so that he does not crash? Take g=10 m/s2. |
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Answer» A stunt driver of mass 60 kg rides a bike inside a hollow metallic sphere of radius 45 m. Assume the bike moves in the central plane of the sphere. If the coefficient of static friction between the wheels of the bike and the metal surface is 0.8, what must be the minimum speed of the driver so that he does not crash? Take g=10 m/s2. |
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| 12. |
A river is flowing from West to East at a speed of 5 m/min. A man on the south bank of the river, capable of swimming at speed 10 m/min in still water, wants to swim across the river in the shortest time. What angle with the bank of the river should he swim at? (in degree) . |
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Answer» A river is flowing from West to East at a speed of 5 m/min. A man on the south bank of the river, capable of swimming at speed 10 m/min in still water, wants to swim across the river in the shortest time. What angle with the bank of the river should he swim at? (in degree) . |
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| 13. |
An ideal gas with adiabatic exponent y is at constant pressure it absorbs Q amount of heat fraction of heat absorbed in increasing the temperature is 1)y 2)1/y 3)1-1/y 4)2y |
| Answer» An ideal gas with adiabatic exponent y is at constant pressure it absorbs Q amount of heat fraction of heat absorbed in increasing the temperature is 1)y 2)1/y 3)1-1/y 4)2y | |
| 14. |
A body of certain mass is tied to one end of a light string of length l, whose other end is fixed at point O. The body is given a speed of √10gl from the lowermost position A. Find the magnitude of change in velocity of body, while moving from position A to B as shown in figure. |
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Answer» A body of certain mass is tied to one end of a light string of length l, whose other end is fixed at point O. The body is given a speed of √10gl from the lowermost position A. Find the magnitude of change in velocity of body, while moving from position A to B as shown in figure. |
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| 15. |
13.A lightly damped oscillatorwith frequency v is set is motion by a harmonic driving force of frequency v' .When v' < v, then response of the osscilator is cntrolled by a oscillator frequency b spring constant c inertia of the mass d damping coefficient |
| Answer» 13.A lightly damped oscillatorwith frequency v is set is motion by a harmonic driving force of frequency v' .When v' < v, then response of the osscilator is cntrolled by a oscillator frequency b spring constant c inertia of the mass d damping coefficient | |
| 16. |
A point charge +q is placed at a distance d from an isolated conducting plane.The field at a point P on the other side of plane is? |
| Answer» A point charge +q is placed at a distance d from an isolated conducting plane.The field at a point P on the other side of plane is? | |
| 17. |
A narrow glass tube of length 100 cm is closed at both ends. It lies horizontally with 20 cm of mercury column in the middle dividing the tube into two compartments I and II of equal length. The air in each compartment is at standard temperature and pressure. The tube is then turned to a vertical position. By what distance will the mercury column be displaced? |
Answer» A narrow glass tube of length 100 cm is closed at both ends. It lies horizontally with 20 cm of mercury column in the middle dividing the tube into two compartments I and II of equal length. The air in each compartment is at standard temperature and pressure. The tube is then turned to a vertical position. By what distance will the mercury column be displaced? |
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| 18. |
A balloon, whichalways remains spherical, has a variable diameter Find the rate of change of its volume with respect to x. |
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Answer» A balloon, which |
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| 19. |
Details pertaining to an orthogonal metal cutting process are given below:Chip thickness ratio 0.4Undeformed thickness 0.6mmRake angle +10oCutting speed 2.5m/sMean thickness of 25microns primary shear zoneThe shear strain rate in s−1 during the process is |
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Answer» Details pertaining to an orthogonal metal cutting process are given below: |
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| 20. |
ntterminal potential difference(V) of a cell(emf E and internal resistance r) is measured as a function of current(I) flowing through it. The slope and intercept of graph between Vand I then respectively are equal to -r and E how?n |
| Answer» ntterminal potential difference(V) of a cell(emf E and internal resistance r) is measured as a function of current(I) flowing through it. The slope and intercept of graph between Vand I then respectively are equal to -r and E how?n | |
| 21. |
How to use acceleration of gravity as positive and negative in different types of questions? |
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Answer» How to use acceleration of gravity as positive and negative in different types of questions? |
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| 22. |
An aircraft moving with a speed of 972 km/hr is at a height of 6000 m, just overhead of an anti-aircraft gun. If the muzzle velocity of the gun is 540 m/s, then the firing angle θ with the horizontal for the bullet to hit the aircraft should be |
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Answer» An aircraft moving with a speed of 972 km/hr is at a height of 6000 m, just overhead of an anti-aircraft gun. If the muzzle velocity of the gun is 540 m/s, then the firing angle θ with the horizontal for the bullet to hit the aircraft should be |
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| 23. |
11. The weight of silver (At. Wt. 108) displaced by aquantity of electricity which displaces 5600 ml O, at STP will be(1) 5.4g Ayst(3) 54.0g m to68 (2) 10.8 g% (4 108.0g |
| Answer» 11. The weight of silver (At. Wt. 108) displaced by aquantity of electricity which displaces 5600 ml O, at STP will be(1) 5.4g Ayst(3) 54.0g m to68 (2) 10.8 g% (4 108.0g | |
| 24. |
An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15∘. What is the radius of the loop? |
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Answer» An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15∘. What is the radius of the loop? |
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| 25. |
The stress-strain graphs for materials A and B are shown in Fig. 9.12.The graphs are drawn to the same scale.(a) Which of the materials has the greater Young’s modulus?(b) Which of the two is the stronger material? |
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Answer» The stress-strain graphs for materials A and B are shown in Fig. 9.12.
The graphs are drawn to the same scale. (a) Which of the materials has the greater Young’s modulus? (b) Which of the two is the stronger material? |
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| 26. |
Supposing the I.P. of hydrogen atom is 960 eV. Find out the value of principal quantum number having the energy equal to -60 eV. 1) n=2 2) n=3 3) n=4 4) n=5 |
| Answer» Supposing the I.P. of hydrogen atom is 960 eV. Find out the value of principal quantum number having the energy equal to -60 eV. 1) n=2 2) n=3 3) n=4 4) n=5 | |
| 27. |
Two trains, 100 and 140 metres long are going in the same direction. The faster train takes 2 minutes to pass the other completely. If they are moving in opposite directions, then they pass each other completely in 5 seconds. What is the speed (in m/sec) of the faster train? |
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Answer» Two trains, 100 and 140 metres long are going in the same direction. The faster train takes 2 minutes to pass the other completely. If they are moving in opposite directions, then they pass each other completely in 5 seconds. What is the speed (in m/sec) of the faster train? |
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| 28. |
4 3 8. A mild steel wire of length 2l meter cross-sectional area A m2 is fixed horizontally between two pillars A small mass m kg is suspended from the mid point of the wire. If extension in wire are within elastic limit. Then depression at the mid point of wire will be 1/3 ( Mg YA (2) Mg IA 1/3 MglYA Mg 2YA |
| Answer» 4 3 8. A mild steel wire of length 2l meter cross-sectional area A m2 is fixed horizontally between two pillars A small mass m kg is suspended from the mid point of the wire. If extension in wire are within elastic limit. Then depression at the mid point of wire will be 1/3 ( Mg YA (2) Mg IA 1/3 MglYA Mg 2YA | |
| 29. |
In Millikan’s oil drop experiment, what is the terminal speed of an uncharged drop of radius 2.0 × 10¯⁵ m and density 1.2 × 103 kg m¯³. Take the viscosity of air at the temperature of the experiment to be 1.8 × 10¯⁵ Pa s. How much is the viscous force on the drop at that speed ? Neglect buoyancy of the drop due to air. |
| Answer» In Millikan’s oil drop experiment, what is the terminal speed of an uncharged drop of radius 2.0 × 10¯⁵ m and density 1.2 × 103 kg m¯³. Take the viscosity of air at the temperature of the experiment to be 1.8 × 10¯⁵ Pa s. How much is the viscous force on the drop at that speed ? Neglect buoyancy of the drop due to air. | |
| 30. |
The magnetic field inside a toroid of radius R is B. If the current through it is doubled and the radius increased four times keeping the number of turns per unit length same, then the magnetic field produced by it will be |
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Answer» The magnetic field inside a toroid of radius R is B. If the current through it is doubled and the radius increased four times keeping the number of turns per unit length same, then the magnetic field produced by it will be |
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| 31. |
Figure shows two block system, 4 kg block rests on a smooth horizontal surface, upper surface of 4 kg is rough a block of mass 2 kg is placed on its upper surface the acceleration of a upper blockwith respect to earth when 4 kg mass is pulled by a force of 30 newborn, is 1)6m/s 2)5 m/s 3)8m/s 4)2m/s |
| Answer» Figure shows two block system, 4 kg block rests on a smooth horizontal surface, upper surface of 4 kg is rough a block of mass 2 kg is placed on its upper surface the acceleration of a upper blockwith respect to earth when 4 kg mass is pulled by a force of 30 newborn, is 1)6m/s 2)5 m/s 3)8m/s 4)2m/s | |
| 32. |
The velocity of kerosene oil in a horizontal pipe is 5 m/s. If then the velocity head of oil will be |
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Answer» The velocity of kerosene oil in a horizontal pipe is 5 m/s. If then the velocity head of oil will be |
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| 33. |
Why light is called electromagnetic wave |
| Answer» Why light is called electromagnetic wave | |
| 34. |
A series R-C circuit is connected to an alternating voltage source. Consider two situations:(a) When capacitor is filled with air(b) When capacitor is filled with micaCurrent through resistor is i and voltage across capacitor is Va in case (a) and Vb in case (b), then |
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Answer» A series R-C circuit is connected to an alternating voltage source. Consider two situations: (a) When capacitor is filled with air (b) When capacitor is filled with mica Current through resistor is i and voltage across capacitor is Va in case (a) and Vb in case (b), then |
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| 35. |
A Pump supplies oil at 0.002m3/sec. to a 50 mm diameter double acting cylinder and a rod diameter is 20 mm. If the load is 6000 N bolts in extending and retracting stroke. Pressure during the extension and return strokes are |
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Answer» A Pump supplies oil at 0.002m3/sec. to a 50 mm diameter double acting cylinder and a rod diameter is 20 mm. If the load is 6000 N bolts in extending and retracting stroke. |
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| 36. |
A level flight plane flying at an altitude 1024 feet with a speed 240 feet per second is overtaking a motor boat travelling at 80 feet per second in the same direction as the plane at what horizontal distance before the boat should a bag be dropped from the plane in order to hit the boat |
| Answer» A level flight plane flying at an altitude 1024 feet with a speed 240 feet per second is overtaking a motor boat travelling at 80 feet per second in the same direction as the plane at what horizontal distance before the boat should a bag be dropped from the plane in order to hit the boat | |
| 37. |
A stone falls freely from rest and the total dis†an ce covered by it in the last second of its motion is equal to the dis†an ce covered by it in the first three seconds of its motion.The stone remains in air for |
| Answer» A stone falls freely from rest and the total dis†an ce covered by it in the last second of its motion is equal to the dis†an ce covered by it in the first three seconds of its motion.The stone remains in air for | |
| 38. |
A boy throws a ball with a velocity u at an angle θ with the horizontal. At the same instant he starts running with uniform velocity to catch the ball before it hits the ground. To achieve this, he should run with a velocity of : |
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Answer» A boy throws a ball with a velocity u at an angle θ with the horizontal. At the same instant he starts running with uniform velocity to catch the ball before it hits the ground. To achieve this, he should run with a velocity of : |
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| 39. |
A large hollow metallic sphere (of radius R) is positively charged to a potential of 100 volts and a small sphere B (of radius R/5) is also positively charged to a potential of 100 volts. Now B is placed inside A and they are connected by a wire the final potential of A will be? |
| Answer» A large hollow metallic sphere (of radius R) is positively charged to a potential of 100 volts and a small sphere B (of radius R/5) is also positively charged to a potential of 100 volts. Now B is placed inside A and they are connected by a wire the final potential of A will be? | |
| 40. |
A liquid flows in the tube from left to right as shown in figure. A1 and A2 are the area of cross - sections of the portions of the tube as shown. If speed of liquid in these portions be V1 & V2 respectively . The ratio of speeds V1V2 will be |
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Answer» A liquid flows in the tube from left to right as shown in figure. A1 and A2 are the area of cross - sections of the portions of the tube as shown. If speed of liquid in these portions be V1 & V2 respectively . The ratio of speeds V1V2 will be |
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| 41. |
A voltage of peak value 283 V and varying frequency is applied to a series LCR combination in which R=3 Ω, L=25 mH and C=400 μF. Then, the frequency (in Hz) of the source at which maximum power is dissipated in the above circuit, is |
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Answer» A voltage of peak value 283 V and varying frequency is applied to a series LCR combination in which R=3 Ω, L=25 mH and C=400 μF. Then, the frequency (in Hz) of the source at which maximum power is dissipated in the above circuit, is |
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| 42. |
A train moving with constant speed 40 m/s in anelliptical path in anticlockwise direction, blows horn atpoint P. An observer standing at point "Q" receives thehorn sound of frequency 2000 Hz. If ratio of minor to25major axis is 1 v3 and speed of sound in air is320 m/s, then true frequency of sound will be |
| Answer» A train moving with constant speed 40 m/s in anelliptical path in anticlockwise direction, blows horn atpoint P. An observer standing at point "Q" receives thehorn sound of frequency 2000 Hz. If ratio of minor to25major axis is 1 v3 and speed of sound in air is320 m/s, then true frequency of sound will be | |
| 43. |
Maximum intensity in YDSE is I0. Find the intensity at a point on the screen where the phase difference between the two interfering beams is π3. |
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Answer» Maximum intensity in YDSE is I0. Find the intensity at a point on the screen where the phase difference between the two interfering beams is π3. |
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| 44. |
The upper edge of a gate in a dam runs along the water surface. The gate is 2 m high and 4 m wide and is hinged along the horizontal line through its top. Find the torque( in kN~m) due to the force from water about the top edge of the gate. |
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Answer» The upper edge of a gate in a dam runs along the water surface. The gate is 2 m high and 4 m wide and is hinged along the horizontal line through its top. Find the torque( in kN~m) due to the force from water about the top edge of the gate. |
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| 45. |
If position of an object is changing as s=7t3+t22+3. Then its acceleration at t=3 sec is |
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Answer» If position of an object is changing as s=7t3+t22+3. Then its acceleration at t=3 sec is |
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| 46. |
Four point masses, each of value m are placed at the corners of square ABCD of side l. The moment of inertia of this system about an axis passing through A and parallel to BD is |
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Answer» Four point masses, each of value m are placed at the corners of square ABCD of side l. The moment of inertia of this system about an axis passing through A and parallel to BD is |
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| 47. |
Calculate the pressure in atm of 1.0mole of helium in a 2.0 dm3 containerat 20.0^° C. |
| Answer» Calculate the pressure in atm of 1.0mole of helium in a 2.0 dm3 containerat 20.0^° C. | |
| 48. |
When the mass is rotated in a plane about a fixed point its angular momentum is directed along |
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Answer» When the mass is rotated in a plane about a fixed point its angular momentum is directed along |
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| 49. |
Express 2.5 atm in kPa. |
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Answer» Express 2.5 atm in kPa. |
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| 50. |
A boy standing on a building of height 20 m throws a stone with a velocity of 15 ms−1. What should be the angle of projection so that the stone has a range of 30 m ? (Take g=10 m/s2) |
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Answer» A boy standing on a building of height 20 m throws a stone with a velocity of 15 ms−1. What should be the angle of projection so that the stone has a range of 30 m ? |
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