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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. |
If the breaking force for a given wire is F, then the breaking force of two wires of same area of cross section but intertwined will be |
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Answer» If the breaking force for a given wire is F, then the breaking force of two wires of same area of cross section but intertwined will be |
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| 2. |
A spring block system (mass m, spring constant k) is placed on a smooth inclined plane of inclination θ. The inclined plane is accelerated horizontally such that the block does not loose contact with the surface. The time period of small oscillation of the block is |
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Answer» A spring block system (mass m, spring constant k) is placed on a smooth inclined plane of inclination θ. The inclined plane is accelerated horizontally such that the block does not loose contact with the surface. The time period of small oscillation of the block is |
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| 3. |
Two liquid drops of same radius are falling through air with a terminal velocity ‘v’. If the drops coalesce to form a single drop, the terminal velocity will be |
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Answer» Two liquid drops of same radius are falling through air with a terminal velocity ‘v’. If the drops coalesce to form a single drop, the terminal velocity will be |
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| 4. |
In a metallic triangular sheet ABC. AB = BC = L. If M is mass of sheet, what is the moment of inertia about AC |
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Answer» In a metallic triangular sheet ABC. AB = BC = L. If M is mass of sheet, what is the moment of inertia about AC
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| 5. |
A wave pulse is described by y(x,t)=[4e−(2x−10t)2] m. The speed of this wave pulse is - |
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Answer» A wave pulse is described by y(x,t)=[4e−(2x−10t)2] m. The speed of this wave pulse is - |
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| 6. |
An optical device is constructed by fixing three identical convex lenses of focal lengths 10 cm each inside a hollow tube at equal spacing of 30 cm each. One end of the device is placed 10 cm away from a point source. How much does the image shift when the device is moved away from the source by another 10 cm? |
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Answer» An optical device is constructed by fixing three identical convex lenses of focal lengths 10 cm each inside a hollow tube at equal spacing of 30 cm each. One end of the device is placed 10 cm away from a point source. How much does the image shift when the device is moved away from the source by another 10 cm? |
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| 7. |
A body constrained to move in z direction is subjected to a force given by →F=(3^i−10^j+5^k) N. What is the work done by this force in moving the body through a distance of 5 m along z−axis? |
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Answer» A body constrained to move in z direction is subjected to a force given by →F=(3^i−10^j+5^k) N. What is the work done by this force in moving the body through a distance of 5 m along z−axis? |
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| 8. |
A horizontal oriented tube AB of length 5 m rotates with a constant angular velocity 0.5 rad/s about a stationary vertical axis OO' passing through the end A. The tube is filled with ideal fluid. The end A of the tube is open, the closed end B has a very small orifice. The velocity with which the liquid comes out from the hole (in m/s) is |
Answer» A horizontal oriented tube AB of length 5 m rotates with a constant angular velocity 0.5 rad/s about a stationary vertical axis OO' passing through the end A. The tube is filled with ideal fluid. The end A of the tube is open, the closed end B has a very small orifice. The velocity with which the liquid comes out from the hole (in m/s) is 
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| 9. |
The variation of potential energy of a harmonic oscillator is as shown in figure. The spring constant k is |
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Answer» The variation of potential energy of a harmonic oscillator is as shown in figure. The spring constant k is |
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| 10. |
A point source of light of power 600 W and 100% efficiency is kept at the center of hemispherical mirror of radius 1 m, force on mirror due to light in micronewtons is (Write upto two digits after the decimal point.) |
Answer» A point source of light of power 600 W and 100% efficiency is kept at the center of hemispherical mirror of radius 1 m, force on mirror due to light in micronewtons is 
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| 11. |
A particle slides down a smooth inclined plane of elevation α fixed in an elevator going with an acceleration ‘a’. The base of the incline has a length ‘L’. the time taken by the particle to reach the bottom is |
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Answer» A particle slides down a smooth inclined plane of elevation α fixed in an elevator going with an acceleration ‘a’. The base of the incline has a length ‘L’. the time taken by the particle to reach the bottom is
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| 12. |
Three solid spheres each of mass m and radius R are placed at three corners of an equilateral triangle of side ‘d’ released. The speed of any one sphere at the time of collision would be: |
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Answer» Three solid spheres each of mass m and radius R are placed at three corners of an equilateral triangle of side ‘d’ released. The speed of any one sphere at the time of collision would be: |
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| 13. |
An electron having kinetic energy T is moving in a circular orbit of radius R perpendicular to a uniform magnetic induction →B. If kinetic energy is doubled and magnetic induction tripled, the radius will become |
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Answer» An electron having kinetic energy T is moving in a circular orbit of radius R perpendicular to a uniform magnetic induction →B. If kinetic energy is doubled and magnetic induction tripled, the radius will become |
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| 14. |
A car of mass m=1000 kg is moving with constant speed v=10 m/s on a parabolic shaped bridge AFOE of span l=40 m and height h=20 m as shown in the figure. Then the net force applied by the bridge on the car, when it is at point F is : Assume g=10 ms−2 |
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Answer» A car of mass m=1000 kg is moving with constant speed v=10 m/s on a parabolic shaped bridge AFOE of span l=40 m and height h=20 m as shown in the figure. Then the net force applied by the bridge on the car, when it is at point F is : |
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| 15. |
If a particle has velocity v(t)=t2−5t+6, the average speed and the magnitude of average velocity in 6 sec respectively are |
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Answer» If a particle has velocity v(t)=t2−5t+6, the average speed and the magnitude of average velocity in 6 sec respectively are |
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| 16. |
Find the height by which the sphere rises when the wedge touches the wall. Let the initial distance between the wedge and the wall is 10 m and the wedge is moved to the left until it touches the wall. (Assume all surfaces to be smooth) |
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Answer» Find the height by which the sphere rises when the wedge touches the wall. Let the initial distance between the wedge and the wall is 10 m and the wedge is moved to the left until it touches the wall. (Assume all surfaces to be smooth) |
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| 17. |
A beaker of circular cross-section of radius 5 cm is filled with mercury upto a height of 15 cm. Find the force exerted by the mercury on the bottom of the beaker. Take atmospheric pressure =105 N/m2, density of mercury =13600 kg/m3, and g=10 m/s2. |
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Answer» A beaker of circular cross-section of radius 5 cm is filled with mercury upto a height of 15 cm. Find the force exerted by the mercury on the bottom of the beaker. Take atmospheric pressure =105 N/m2, density of mercury =13600 kg/m3, and g=10 m/s2. |
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| 18. |
Explain Millikan oil drop experiment in simple ways? |
| Answer» Explain Millikan oil drop experiment in simple ways? | |
| 19. |
Which of the following graphs represent the correct variation of velocity (v) of sound with the pressure (P) in a gas at constant temperature? |
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Answer» Which of the following graphs represent the correct variation of velocity (v) of sound with the pressure (P) in a gas at constant temperature? |
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| 20. |
A source 's' is emitting waves, which travels through a tube of given shape. The detector 'D ' detects constructive interference of certain frequencies. If speed of wave is v and n is an integer then those frequencies are |
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Answer» A source 's' is emitting waves, which travels through a tube of given shape. The detector 'D ' detects constructive interference of certain frequencies. If speed of wave is v and n is an integer then those frequencies are |
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| 21. |
Dimensional formula for permeability |
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Answer» Dimensional formula for permeability |
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| 22. |
The magnitude of the displacement of a particle moving in a circle of radius a with constant angular speed ω varies with time t as |
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Answer» The magnitude of the displacement of a particle moving in a circle of radius a with constant angular speed ω varies with time t as |
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| 23. |
A train A runs from east to west and another train B of the same mass and speed runs from west to east along the equator. A presses the track with a force F1 and B with F2. Then: |
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Answer» A train A runs from east to west and another train B of the same mass and speed runs from west to east along the equator. A presses the track with a force F1 and B with F2. Then: |
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| 24. |
At what angle should a body be projected with a velocity 24 ms–1 just to pass over the obstacle 14 m high at a distance of 24 m. [Take g=10 ms–2] |
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Answer» At what angle should a body be projected with a velocity 24 ms–1 just to pass over the obstacle 14 m high at a distance of 24 m. |
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| 25. |
A ball is in a hot air balloon that starts from rest at t = 0 and accelerates upwards at 2m/s2. After 10s, the ball is dropped from the balloon The position time graph will be? |
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Answer» A ball is in a hot air balloon that starts from rest at t = 0 and accelerates upwards at 2m/s2. After 10s, the ball is dropped from the balloon The position time graph will be? |
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| 26. |
A nuclear power plant supplying electrical power to a village uses a radioactive material of half life T years as the fuel. The amount of fuel at the beginning is such that the total power requirement of the village is 12.5 of the electrical power available from the plant at that time. If the plant is able to meet the total power needs of the village for a maximum period of nT years, then the value of n is |
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Answer» A nuclear power plant supplying electrical power to a village uses a radioactive material of half life T years as the fuel. The amount of fuel at the beginning is such that the total power requirement of the village is 12.5 of the electrical power available from the plant at that time. If the plant is able to meet the total power needs of the village for a maximum period of nT years, then the value of n is |
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| 27. |
What would happen if we touched the metal sphere on the side closer to the Van de Graaff generator? |
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Answer» What would happen if we touched the metal sphere on the side closer to the Van de Graaff generator? |
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| 28. |
A tuning fork produces 4 beats per second with another tuning fork of frequency 256 Hz. The first one is now loaded with a little wax and the beat frequency is found to increase to 6 per second. What was the original frequency of the tuning fork? |
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Answer» A tuning fork produces 4 beats per second with another tuning fork of frequency 256 Hz. The first one is now loaded with a little wax and the beat frequency is found to increase to 6 per second. What was the original frequency of the tuning fork? |
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| 29. |
One end of steel wire is fixed to ceiling of an elevator moving up with an acceleration of 2 m/s2 and a load of 10 kg hangs from the other end. Area of cross-section of the wire is 2 cm2. The longitudinal strain in the wire is [ Y=2×1011 N/m2 ] |
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Answer» One end of steel wire is fixed to ceiling of an elevator moving up with an acceleration of 2 m/s2 and a load of 10 kg hangs from the other end. Area of cross-section of the wire is 2 cm2. The longitudinal strain in the wire is [ Y=2×1011 N/m2 ]
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| 30. |
The inductive reactance of a coil is 1000 Ω. If its self inductance and frequency both are increased two times, then inductive reactance will be |
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Answer» The inductive reactance of a coil is 1000 Ω. If its self inductance and frequency both are increased two times, then inductive reactance will be |
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| 31. |
State whether true or false: The positive charge of an isolated system is conserved. |
| Answer» State whether true or false: The positive charge of an isolated system is conserved. | |
| 32. |
Two blocks A and B of masses 5 kg and 4 kg respectively are connected by a light string. If a constant force of 9N is applied to 5kg block, the tension in the string is |
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Answer» Two blocks A and B of masses 5 kg and 4 kg respectively are connected by a light string. If a constant force of 9N is applied to 5kg block, the tension in the string is
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| 33. |
Which of the following is the universal gate? |
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Answer» Which of the following is the universal gate? |
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| 34. |
If a freely balling body covers half of its total distance in the last second of the its journey. Find its time of fall... Sir, please let me know how to solve this step by step... |
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Answer» If a freely balling body covers half of its total distance in the last second of the its journey. Find its time of fall... Sir, please let me know how to solve this step by step... |
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| 35. |
FG and Fe represents gravitational and electrostatic force respectively between electrons situated at a distane 10 cm. The ratio of FG/Fe is nearly of the order of |
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Answer» FG and Fe represents gravitational and electrostatic force respectively between electrons situated at a distane 10 cm. The ratio of FG/Fe is nearly of the order of |
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| 36. |
The position →r=(2.00t3−5.00t)^i+(6.00−7.00t4)^j, with →r in meters and t in seconds. What is the angle between the positive direction of the x-axis and a line tangent to the particle's path at t=2.00 s? |
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Answer» The position →r=(2.00t3−5.00t)^i+(6.00−7.00t4)^j, with →r in meters and t in seconds. |
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| 37. |
How many times a diatomic gas should be expanded adiabatically so as to reduce the root mean square velocity to half? |
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Answer» How many times a diatomic gas should be expanded adiabatically so as to reduce the root mean square velocity to half? |
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| 38. |
Four point charges +q, +q, -q and -q are placed on the corners of a square of side length ′a′ as shown in the figure. Magnitude of electric field at a point which is at a distance x(>>a) from the centre along a line perpendicular to the plane of square and passing through the center is |
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Answer» Four point charges +q, +q, -q and -q are placed on the corners of a square of side length ′a′ as shown in the figure. Magnitude of electric field at a point which is at a distance x(>>a) from the centre along a line perpendicular to the plane of square and passing through the center is |
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| 39. |
The maximum frequency of X-rays produced in an X-ray tube is v when the operating voltage is V. What is the maximum frequency of the X-rays when the operating voltage is V2? |
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Answer» The maximum frequency of X-rays produced in an X-ray tube is v when the operating voltage is V. What is the maximum frequency of the X-rays when the operating voltage is V2? |
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| 40. |
A spring having a spring constant 'K' is loaded with a mass 'm'. The spring is cut into two equal parts and one of these is loaded again with the same mass. The new spring constant is |
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Answer» A spring having a spring constant 'K' is loaded with a mass 'm'. The spring is cut into two equal parts and one of these is loaded again with the same mass. The new spring constant is
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| 41. |
The resistance of a wire is 4 ohm. What is its new resistance, if it is stretched to thrice its original lenght? |
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Answer» The resistance of a wire is 4 ohm. What is its new resistance, if it is stretched to thrice its original lenght? |
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| 42. |
Redefine the function f(x) =[x]+[x] in such a way that it becomes continuous for x∈(0,2) |
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Answer» Redefine the function f(x) =[x]+[x] in such a way that it becomes continuous for x∈(0,2) |
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| 43. |
A gardener waters plants by a pipe of diameter 1cm the water comes out at rate of 20cm×cm×cm÷s the reaction force on hand is 0.0051N |
| Answer» A gardener waters plants by a pipe of diameter 1cm the water comes out at rate of 20cm×cm×cm÷s the reaction force on hand is 0.0051N | |
| 44. |
If block A is moving horizontally with velocity vA, then find the velocity of block B at the instant shown in figure. |
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Answer» If block A is moving horizontally with velocity vA, then find the velocity of block B at the instant shown in figure. |
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| 45. |
Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take 'g' constant with a value 10 m/s2. The work done by the (i) gravitational force (ii) resistive force of air is |
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Answer» Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take 'g' constant with a value 10 m/s2. The work done by the (i) gravitational force (ii) resistive force of air is |
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| 46. |
A wave is represented by the equation y=7 sin(7πt−0.04πx+π3) x is in metres and t is in seconds. The speed of the wave is |
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Answer» A wave is represented by the equation y=7 sin(7πt−0.04πx+π3) x is in metres and t is in seconds. The speed of the wave is |
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| 47. |
The charge enclosed by a spherical Gaussian surface is 8.85 × 10-8 C.What will be the electric flux through the surface? |
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Answer» The charge enclosed by a spherical Gaussian surface is 8.85 × 10-8 C.What will be the electric flux through the surface? |
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| 48. |
Length of a hollow tube is 5m, it’s outer diameter is 10 cm and thickness of it’s wall is 5 mm. If resistivity of the material of the tube is 1.7×10−8 Ω m then the resistance of the tube will be |
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Answer» Length of a hollow tube is 5m, it’s outer diameter is 10 cm and thickness of it’s wall is 5 mm. If resistivity of the material of the tube is 1.7×10−8 Ω m then the resistance of the tube will be |
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| 49. |
River is flowing at 3 Km/h in the west direction and You can swim at a maximum speed of 5 Km/h , then at what direction must you swim so that you end up swimming perpendicular to the bank? |
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Answer» River is flowing at 3 Km/h in the west direction and You can swim at a maximum speed of 5 Km/h , then at what direction must you swim so that you end up swimming perpendicular to the bank? |
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| 50. |
The area of the parallelogram whose adjacent sides are 3^i+2^j+^k and ^j+2^k is (a) 3√6 (b) 4 (c) 3√62 (d) 54 |
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Answer» The area of the parallelogram whose adjacent sides are 3^i+2^j+^k and ^j+2^k is (a) 3√6 (b) 4 (c) 3√62 (d) 54 |
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