Saved Bookmarks
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. |
HOW TO FIND ELECTRIC FIELD DUE TO A HEMISPHERE . |
| Answer» HOW TO FIND ELECTRIC FIELD DUE TO A HEMISPHERE . | |
| 2. |
17 1 M aqueous solution of NaCl undergo electrolysis if 50mA current is passed for 12 hours. Assume current efficiency is 25%.The total volume of gas produced at standard state is |
| Answer» 17 1 M aqueous solution of NaCl undergo electrolysis if 50mA current is passed for 12 hours. Assume current efficiency is 25%.The total volume of gas produced at standard state is | |
| 3. |
Doppler's effect will not be applicable when the velocity of sound source is |
|
Answer» Doppler's effect will not be applicable when the velocity of sound source is |
|
| 4. |
Electrons (e,m) emitted with negligible speed from an electron gun are accelerated through a potential difference V0 along the x-axis. These electrons emerge from a narrow hole into a uniform magnetic field of strength B directed along x-axis. Some electrons emerging at slightly divergent angles as shown. These electrons are refocused on the x -axis for second time at a distance √Nπ2mV0eB2. Find the value of N ___. |
Answer» Electrons (e,m) emitted with negligible speed from an electron gun are accelerated through a potential difference V0 along the x-axis. These electrons emerge from a narrow hole into a uniform magnetic field of strength B directed along x-axis. Some electrons emerging at slightly divergent angles as shown. These electrons are refocused on the x -axis for second time at a distance √Nπ2mV0eB2. Find the value of N |
|
| 5. |
Rain is falling vertically in downward sense. A bowl is kept below the falling rain and rainwater gets accumulated in it. Now, if air is blowing in horizontal sense, will there be any change in rate of accumulation of rain water in the bowl? |
| Answer» Rain is falling vertically in downward sense. A bowl is kept below the falling rain and rainwater gets accumulated in it. Now, if air is blowing in horizontal sense, will there be any change in rate of accumulation of rain water in the bowl? | |
| 6. |
58.How the focal length of the concave lens will change when placed in water? |
| Answer» 58.How the focal length of the concave lens will change when placed in water? | |
| 7. |
(a) Name the high energetic invisible electromagnetic wave which helps in the study of structure of crystals. (b) State one more use of the wave named in part (a). |
|
Answer» (a) Name the high energetic invisible electromagnetic wave which helps in the study of structure of crystals. (b) State one more use of the wave named in part (a). |
|
| 8. |
From a uniform circular disc of mass M and radius R a small circular disc of radius R/2is removed in such a way that both have a common tangent.find the distance of centre of mass of remaining part from the centre of original disc. |
| Answer» From a uniform circular disc of mass M and radius R a small circular disc of radius R/2is removed in such a way that both have a common tangent.find the distance of centre of mass of remaining part from the centre of original disc. | |
| 9. |
Press the stem of an excite turning folk of frequency 512Hz on a table having natural frequency 384Hz. A) what is the frequency of vibration of the at this instance? B) what is change in the loudness of sound produce? Why? C) what happen if you press a turning folk of natural frequency 384Hz on the table? Explain |
|
Answer» Press the stem of an excite turning folk of frequency 512Hz on a table having natural frequency 384Hz. A) what is the frequency of vibration of the at this instance? B) what is change in the loudness of sound produce? Why? C) what happen if you press a turning folk of natural frequency 384Hz on the table? Explain |
|
| 10. |
If the tension and diameter of a sonometer wire of fundamental frequency n are doubled and density is halved, then its fundamental frequency will become |
| Answer» If the tension and diameter of a sonometer wire of fundamental frequency n are doubled and density is halved, then its fundamental frequency will become | |
| 11. |
Read the following paragraph and answer the questions.If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy.The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box.i. Heat is transferred from where to where?ii. Which principle do we learn about from this process?iii. How will you state the principle briefly?iv. Which property of the substance is measured using this principle? |
|
Answer» Read the following paragraph and answer the questions. If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. i. Heat is transferred from where to where? ii. Which principle do we learn about from this process? iii. How will you state the principle briefly? iv. Which property of the substance is measured using this principle? |
|
| 12. |
Which of the statement/s is/are true for a fluorescent lamp? |
|
Answer» Which of the statement/s is/are true for a fluorescent lamp? |
|
| 13. |
96. Show that if a body be projected vertically upward from the surface of the earth so as to reach a height nR above the surface i) the increase in its potential energy is (n/n+1)mgR ii) the velocity with which it must be projected is \sqrt{}(2ngR/n+1), where R is the radius of the earth and m the mass of body |
| Answer» 96. Show that if a body be projected vertically upward from the surface of the earth so as to reach a height nR above the surface i) the increase in its potential energy is (n/n+1)mgR ii) the velocity with which it must be projected is \sqrt{}(2ngR/n+1), where R is the radius of the earth and m the mass of body | |
| 14. |
Class II levers are designed to have : (a) M.A = V. R. (b) M.A > V. R. (c) M.A. > 1 (d) M. A. < 1 |
|
Answer» Class II levers are designed to have : (a) M.A = V. R. (b) M.A > V. R. (c) M.A. > 1 (d) M. A. < 1 |
|
| 15. |
ntA current flows in a cylindrical conductor from west to east.(in x-y plane) .The direction of the magnetic field at a point P above the conductor in the same plane is alongn nt+x,+y,+z,-y axis?n |
| Answer» ntA current flows in a cylindrical conductor from west to east.(in x-y plane) .The direction of the magnetic field at a point P above the conductor in the same plane is alongn nt+x,+y,+z,-y axis?n | |
| 16. |
55.A bar magnet when placed at an angle of 30 degree to the direction of magnetic field induction of 5×(10)-2 T,experiencing a moment of couple 25× (10)-6 Nm.If the length of the magnet is5 cm,its pole strength is? |
| Answer» 55.A bar magnet when placed at an angle of 30 degree to the direction of magnetic field induction of 5×(10)-2 T,experiencing a moment of couple 25× (10)-6 Nm.If the length of the magnet is5 cm,its pole strength is? | |
| 17. |
Fuel formed under the earth's surface by the decomposition of organic matter is called: |
|
Answer» Fuel formed under the earth's surface by the decomposition of organic matter is called: |
|
| 18. |
Assume that a tunnel is dug along a chord of the earth, at a perpendicular distance R2 from the earth's centre where R is the radius of the earth. The wall of the tunnel is frictionless. (a) Find the gravitational force exerted by the earth on a particle of mass m placed in the tunnel at a distance x from the centre of the tunnel (b) Rind the component of this force along the tunnel and perpendicular to the tunnel. (c) Find the normal force exerted by the wall on the particle. (d) find the resultant force on the particle. (e) Show that the motion of the particle in the tunnel is simple harmonic and find the time period. |
|
Answer» Assume that a tunnel is dug along a chord of the earth, at a perpendicular distance R2 from the earth's centre where R is the radius of the earth. The wall of the tunnel is frictionless. (a) Find the gravitational force exerted by the earth on a particle of mass m placed in the tunnel at a distance x from the centre of the tunnel (b) Rind the component of this force along the tunnel and perpendicular to the tunnel. (c) Find the normal force exerted by the wall on the particle. (d) find the resultant force on the particle. (e) Show that the motion of the particle in the tunnel is simple harmonic and find the time period. |
|
| 19. |
There is a rec†an gular shaped circuit ACDF. In AF side, a capacitor of capaci†an ce C and a resistor R2=1Ω are present. In side CD, a battery of voltage V and key K( in between -ve terminal of battery and point D) are present. At the middle of side AC, a point B and at the middle of side DF, a point E is present. In between points B and E, a resistor R1=2Ω is connected. In between points E and D, a resistor R3=4Ω is connected. Now draw the circuit and find the total loss of energy through resistor R2, when key K is opened. -1) CV^2/18, 2)CV^2/54, 3)CV^2/2, 4)CV^2/104. |
| Answer» There is a rec†an gular shaped circuit ACDF. In AF side, a capacitor of capaci†an ce C and a resistor R2=1Ω are present. In side CD, a battery of voltage V and key K( in between -ve terminal of battery and point D) are present. At the middle of side AC, a point B and at the middle of side DF, a point E is present. In between points B and E, a resistor R1=2Ω is connected. In between points E and D, a resistor R3=4Ω is connected. Now draw the circuit and find the total loss of energy through resistor R2, when key K is opened. -1) CV^2/18, 2)CV^2/54, 3)CV^2/2, 4)CV^2/104. | |
| 20. |
What are the properties of the magnetic field? |
| Answer» What are the properties of the magnetic field? | |
| 21. |
A person with hypermetropic eye can read only material kept beyond 50 cm from the eye. Why? |
|
Answer» A person with hypermetropic eye can read only material kept beyond 50 cm from the eye. Why? |
|
| 22. |
A farsighted person cannot focus distinctly objects closer than 100 cm. The lens that will permit him to read from a distance of 50 cm, will have a focal length:A. +50 cmB. -50 cmC. +100 cmD. -100 cm |
|
Answer» A farsighted person cannot focus distinctly objects closer than 100 cm. The lens that will permit him to read from a distance of 50 cm, will have a focal length: A. +50 cm B. -50 cm C. +100 cm D. -100 cm |
|
| 23. |
A light ray is incident normally on the surface AB of a prism of refracting angle 60 degree if the light ray does not emerge from AC then find the refractive index of the prism |
| Answer» A light ray is incident normally on the surface AB of a prism of refracting angle 60 degree if the light ray does not emerge from AC then find the refractive index of the prism | |
| 24. |
Two lenses A and B have focal lengths of + 20 cm and, -10 cm, respectively. (a) What is the nature of lens A and lens B ? (b) What is the power of lens A and lens B ? (c) What is the power of combination if lenses A and B are held close together ? |
|
Answer» Two lenses A and B have focal lengths of + 20 cm and, -10 cm, respectively. (a) What is the nature of lens A and lens B ? (b) What is the power of lens A and lens B ? (c) What is the power of combination if lenses A and B are held close together ? |
|
| 25. |
16. A metal M crystallize in FCC and BCC structure depending upon temperature.The ratio of its densities in FCC and BCC structures would be |
| Answer» 16. A metal M crystallize in FCC and BCC structure depending upon temperature.The ratio of its densities in FCC and BCC structures would be | |
| 26. |
Write the three characteristics of the image formed by a convex lens of focal length 20 cm for the object at following distance from the lens.(i) 10 cm(ii) 30 cm(iii) 40 cm(iv) 60 cm |
|
Answer» Write the three characteristics of the image formed by a convex lens of focal length 20 cm for the object at following distance from the lens. (i) 10 cm (ii) 30 cm (iii) 40 cm (iv) 60 cm |
|
| 27. |
what is the SI unit of magnification |
| Answer» what is the SI unit of magnification | |
| 28. |
ntA comcave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2 .A beam of liqht coming from infinity and falling on this convex lens mirror combination returns to infinity .The distance d be?n ntExplain in detail why does one of the two focal length get doubledn |
| Answer» ntA comcave mirror of focal length f1 is placed at a distance of d from a convex lens of focal length f2 .A beam of liqht coming from infinity and falling on this convex lens mirror combination returns to infinity .The distance d be?n ntExplain in detail why does one of the two focal length get doubledn | |
| 29. |
A radii of curvature of two faces of a biconvex lens of refractive index are in the ratioof 2:3. The focal length of the lens is 12 cm. The radius of curvature of the surfacewith low value of radius of curvature is |
|
Answer» A radii of curvature of two faces of a biconvex lens of refractive index are in the ratio of 2:3. The focal length of the lens is 12 cm. The radius of curvature of the surface with low value of radius of curvature is |
|
| 30. |
Does an insulated wire also produce a magnetic field? |
| Answer» Does an insulated wire also produce a magnetic field? | |
| 31. |
Question 6The angle of elevation of the top of a tower from two points distant s and t from its foot are complementary. Prove that the height of the tower is √st |
|
Answer» Question 6 The angle of elevation of the top of a tower from two points distant s and t from its foot are complementary. Prove that the height of the tower is √st |
|
| 32. |
A chord of length 90 m is used to connect a200 kg astronaut to a spaceship of very heavy mass .Assume that the spaceship and theastronaut fall on a straight line from the earthcentre. What is the tension in the string?(A) 0 00844 N(C) 0-844 N(B) 0-0844 N(D) 8.44 N |
| Answer» A chord of length 90 m is used to connect a200 kg astronaut to a spaceship of very heavy mass .Assume that the spaceship and theastronaut fall on a straight line from the earthcentre. What is the tension in the string?(A) 0 00844 N(C) 0-844 N(B) 0-0844 N(D) 8.44 N | |
| 33. |
In certain applications, electromagnets are better than permanent magnets because: (more than one answers can be correct) |
|
Answer» In certain applications, electromagnets are better than permanent magnets because: |
|
| 34. |
A: during circular horizontal turn of a car ,the centripetal force required should be less than the limiting friction between the tyres and road R:the centripetal force to car is provided by frictional force between the tyres and the road. |
| Answer» A: during circular horizontal turn of a car ,the centripetal force required should be less than the limiting friction between the tyres and road R:the centripetal force to car is provided by frictional force between the tyres and the road. | |
| 35. |
In nuclear fission process, what happens to the nucleus of an atom? |
|
Answer» In nuclear fission process, what happens to the nucleus of an atom? |
|
| 36. |
A solenoid has 600 turns per meter and has a self-inductance of 108 mH. What will be the self inductance of the solenoid if the number of turns per unit length is changed to 500 turns per meter keeping length and area of the solenoid same. |
|
Answer» A solenoid has 600 turns per meter and has a self-inductance of 108 mH. What will be the self inductance of the solenoid if the number of turns per unit length is changed to 500 turns per meter keeping length and area of the solenoid same. |
|
| 37. |
What is a switch?How does it work in an electric curcuit? |
| Answer» What is a switch?How does it work in an electric curcuit? | |
| 38. |
A ray of light is incident on one face of a transparent slab of thickness 15 cm. The angle of incidence is 60∘. If the lateral displacement of the ray on emerging from the parallel plane is 5√3 cm, the refractive index of the material of the slab is |
|
Answer» A ray of light is incident on one face of a transparent slab of thickness 15 cm. The angle of incidence is 60∘. If the lateral displacement of the ray on emerging from the parallel plane is 5√3 cm, the refractive index of the material of the slab is |
|
| 39. |
Which of the following is the correct shape of bending moment diagram for the propped cantilever beam as shown in the figure? |
|
Answer» Which of the following is the correct shape of bending moment diagram for the propped cantilever beam as shown in the figure? |
|
| 40. |
Kink is used in some thermometers to ___ |
|
Answer» Kink is used in some thermometers to ___ |
|
| 41. |
In response to the increasing cost of producing energy through traditional means, such as combustion, many utility companies have begun investing in renewable energy sources, chiefly wind and solar power, hoping someday to rely on them completely and thus lower energy costs. The utility companies claim that although these sources require significant initial capital investment, they will provide stable energy supplies at low cost. As a result, these sources will be less risky for the utilities than non-renewable sources, such as gas, oil, and coal, whose prices can fluctuate dramatically according to availability. The claim of the utility companies presupposes which of the following? |
|
Answer» In response to the increasing cost of producing energy through traditional means, such as combustion, many utility companies have begun investing in renewable energy sources, chiefly wind and solar power, hoping someday to rely on them completely and thus lower energy costs. The utility companies claim that although these sources require significant initial capital investment, they will provide stable energy supplies at low cost. As a result, these sources will be less risky for the utilities than non-renewable sources, such as gas, oil, and coal, whose prices can fluctuate dramatically according to availability. The claim of the utility companies presupposes which of the following? |
|
| 42. |
Select conductors of electricity from the following: Copper wire, silk thread, pure water, acidulated water, a human body, glass, mercury. |
|
Answer» Select conductors of electricity from the following: Copper wire, silk thread, pure water, acidulated water, a human body, glass, mercury. |
|
| 43. |
In which of the following states the practice of ‘roof top water harvesting’ was largely practised? |
|
Answer» In which of the following states the practice of ‘roof top water harvesting’ was largely practised? |
|
| 44. |
The energy which is not derived from the sun is |
|
Answer» The energy which is not derived from the sun is |
|
| 45. |
A 5 V battery and a 2 V battery are connected to the resistances as shown. The current in the 10 Ω resistor is : |
|
Answer» A 5 V battery and a 2 V battery are connected to the resistances as shown. The current in the 10 Ω resistor is : |
|
| 46. |
The coloured light having the maximum speed in glass prism is : (a) blue (b) green (c) violet (d) yellow |
|
Answer» The coloured light having the maximum speed in glass prism is : (a) blue (b) green (c) violet (d) yellow |
|
| 47. |
Question 1Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.)(a) mass(b) speed(c) velocity(d) momentum |
|
Answer» Question 1 |
|
| 48. |
Who patented the steam engine? |
|
Answer» Who patented the steam engine? |
|
| 49. |
A wire of length L is formed into a circular coil of n turns. If the coil carries a current i and placed in a given magnetic field B, the maximum possible torque developed is |
|
Answer» A wire of length L is formed into a circular coil of n turns. If the coil carries a current i and placed in a given magnetic field B, the maximum possible torque developed is |
|
| 50. |
The physical quantity that an electron volt measures is: |
|
Answer» The physical quantity that an electron volt measures is: |
|
