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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. |
For a generator of armature coil resistance 20 Q with load resistance 10 Q, current flowing is 5 amp. The efficiency of this generator is |
| Answer» For a generator of armature coil resistance 20 Q with load resistance 10 Q, current flowing is 5 amp. The efficiency of this generator is | |
| 2. |
How does the colour code of wires in a cable help in house wiring? |
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Answer» How does the colour code of wires in a cable help in house wiring? |
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| 3. |
A siren placed at a railway platform is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz, while the train approaches the siren. During his return journey in a different train B he records a frequency of 6.0 kHz while approaching the same siren.The ratio of the velocity of train B to that train A is |
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Answer» A siren placed at a railway platform is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz, while the train approaches the siren. During his return journey in a different train B he records a frequency of 6.0 kHz while approaching the same siren.The ratio of the velocity of train B to that train A is |
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| 4. |
let x be the kinetic energy of the satellite then time period of the satellite T is propotional to |
| Answer» let x be the kinetic energy of the satellite then time period of the satellite T is propotional to | |
| 5. |
Why are danger signal lights red in colour? |
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Answer» Why are danger signal lights red in colour? |
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| 6. |
What is the difference between small 'c' and capital 'C' used in calorimetry |
| Answer» What is the difference between small 'c' and capital 'C' used in calorimetry | |
| 7. |
98.Calculate the frequency of particle waves when the kinetic energy of a sub atomic particle is 3.79×10 27 J. |
| Answer» 98.Calculate the frequency of particle waves when the kinetic energy of a sub atomic particle is 3.79×10 27 J. | |
| 8. |
Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies. |
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Answer» Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies. |
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| 9. |
a capacitor is half filled with a dielectric (k=2) as shown in figure A. If the same capacitor is to be filled with same dielectric as shown, what would be the thickness of dielectric so that capacitor still has the same capacity? |
| Answer» a capacitor is half filled with a dielectric (k=2) as shown in figure A. If the same capacitor is to be filled with same dielectric as shown, what would be the thickness of dielectric so that capacitor still has the same capacity? | |
| 10. |
Question 5The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely the cause for lowering the pH of river water?(a) Soap and detergent factory(b) Lead battery manufacturing factory(c) Plastic cup manufacturing factory(d) Alcohol distillery |
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Answer» Question 5 The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely the cause for lowering the pH of river water? (a) Soap and detergent factory (b) Lead battery manufacturing factory (c) Plastic cup manufacturing factory (d) Alcohol distillery |
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| 11. |
Question 13In our country, there are attempts to increase the height of several existing dams like Tehri and Almati, dams across Narmada. Choose the correct statements among the following that are a consequence of raising the height of dams(i) Terrestrial flora and fauna of the area are destroyed completely(ii) Dislocation of people and domestic animals living in the area(iii) Valuable agricultural land may be permanently lost(iv) It will generate permanent employment for people(a) (i) and (ii)(b) (i), (ii) and (iii)(c) (ii) and (iv)(d) (i), (iii) and (iv) |
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Answer» Question 13 |
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| 12. |
97.A planoconvex lens of refractive index 1.5 and radious of curvature 30 cm ,is silvered at the curved surface. Now this lens has been used to form the image of an object.At what distance from this lens an object be placed in order to have a real image of the size of the object a)20 cm b)30 cm c)60 cm d)80 cm |
| Answer» 97.A planoconvex lens of refractive index 1.5 and radious of curvature 30 cm ,is silvered at the curved surface. Now this lens has been used to form the image of an object.At what distance from this lens an object be placed in order to have a real image of the size of the object a)20 cm b)30 cm c)60 cm d)80 cm | |
| 13. |
What is the amount of mass lost in grams, in order to result in an energy of 2×106 kWh? (1 kWh=3.6×106 J)0.08 |
Answer» What is the amount of mass lost in grams, in order to result in an energy of 2×106 kWh? (1 kWh=3.6×106 J)
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| 14. |
Question 10Two poles of equal heights are standing opposite each other on either side of the road, which is 80 m wide. From a point between them on the road, the angles of elevation of the top of the poles are 60∘ and 30∘, respectively. Find the height of the poles and the distances of the point from the poles. |
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Answer» Question 10 |
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| 15. |
A conductor typically possesses free electrons per cubic meter. |
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Answer» A conductor typically possesses |
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| 16. |
Find the potential difference across B & C points. |
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Answer» Find the potential difference across B & C points. |
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| 17. |
"Discontinuity in electric fields is always a constant sigma/epsilon as we cross a surface". Explain this statement. |
| Answer» "Discontinuity in electric fields is always a constant sigma/epsilon as we cross a surface". Explain this statement. | |
| 18. |
Which metal cation has highest heat of hydration?Why ? Cr2+ Co2+ V2+ Ni2+ |
| Answer» Which metal cation has highest heat of hydration?Why ? Cr2+ Co2+ V2+ Ni2+ | |
| 19. |
The thermal expansion of solids ___ . |
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Answer» The thermal expansion of solids |
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| 20. |
In an air standard diesel cycle the fuel cut off ratio is 2. If the temperature at the start of compression stroke is 27∘C, then the temperature (in K) at the end of expansion stroke is __________. (Rounded upto one decimal place)791.7 |
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Answer» In an air standard diesel cycle the fuel cut off ratio is 2. If the temperature at the start of compression stroke is 27∘C, then the temperature (in K) at the end of expansion stroke is __________. (Rounded upto one decimal place)
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| 21. |
An object is placed at 30 cm in front of the convex lens of focal length 10 cm. Find out the image distance from lens? |
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Answer» An object is placed at 30 cm in front of the convex lens of focal length 10 cm. Find out the image distance from lens? |
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| 22. |
What is the resistance and resistivity of the conductor if it's area is doubled |
| Answer» What is the resistance and resistivity of the conductor if it's area is doubled | |
| 23. |
Positive charge Q is given to each plate of a parallel plate air capacitor having area of each plate A and separation between them d. Then find: 1. Capacitance of the system 2. Charges appearing on each surface of plates 3. Electric field between the plates 4. Potential difference between the plates 5. Energy stored between the plates |
| Answer» Positive charge Q is given to each plate of a parallel plate air capacitor having area of each plate A and separation between them d. Then find: 1. Capacitance of the system 2. Charges appearing on each surface of plates 3. Electric field between the plates 4. Potential difference between the plates 5. Energy stored between the plates | |
| 24. |
Give two properties of infrared radiations which differ front the visible light. |
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Answer» Give two properties of infrared radiations which differ front the visible light. |
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| 25. |
A projectile projected from the ground has its direction of motion making an angle 45degree with the horizontal at a height 40m. its initial velocity of projection is 50m/s ,its angle of projection is |
| Answer» A projectile projected from the ground has its direction of motion making an angle 45degree with the horizontal at a height 40m. its initial velocity of projection is 50m/s ,its angle of projection is | |
| 26. |
why turn over number is inversely proportional to Km? |
| Answer» why turn over number is inversely proportional to Km? | |
| 27. |
if accelaration due to gravity on the surface of earth is g then its value at an altitude equal to radius of earth R is |
| Answer» if accelaration due to gravity on the surface of earth is g then its value at an altitude equal to radius of earth R is | |
| 28. |
If a lens has a focal length, f = -12 cm. then it is a |
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Answer» If a lens has a focal length, f = -12 cm. then it is a |
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| 29. |
Amit is very consious about pollution. Which fuel he should use for his vehicle? |
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Answer» Amit is very consious about pollution. Which fuel he should use for his vehicle? |
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| 30. |
3 identical specimens- Ni, Al, & antimony are placed in uniform magnetic field. Draw the modifications in the field lines in each case. |
| Answer» 3 identical specimens- Ni, Al, & antimony are placed in uniform magnetic field. Draw the modifications in the field lines in each case. | |
| 31. |
What step should be taken immediately if a person gets an electric shock after touching a live wire? |
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Answer» What step should be taken immediately if a person gets an electric shock after touching a live wire? |
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| 32. |
A bomb of mass 3 kg at rest, explodes in air into two pieces of masses 2 kg and 1 kg. the smaller mass goes at a speed of 80 metre per second .the total energy imparted to the two fragments is 1.0 7kJ 2.1kJ 2.4 kJ 4.8kJ |
| Answer» A bomb of mass 3 kg at rest, explodes in air into two pieces of masses 2 kg and 1 kg. the smaller mass goes at a speed of 80 metre per second .the total energy imparted to the two fragments is 1.0 7kJ 2.1kJ 2.4 kJ 4.8kJ | |
| 33. |
A nucleus moving with a velocity →v emits an α-p article. Let the velocities of the α-particle and the remaining nucleus be →v1 and →v2 and their masses be m1, and m2 respectively. Choose the correct option. |
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Answer» A nucleus moving with a velocity →v emits an α-p article. Let the velocities of the α-particle and the remaining nucleus be →v1 and →v2 and their masses be m1, and m2 respectively. Choose the correct option. |
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| 34. |
A circular insulated copper wire loop is twisted to form two loops of area A and 2A as shown in the figure. At the point of crossing the wires remain electrically insulated from each other. The entire loop lies in the plane (of the paper). A uniform magnetic field B point into the plane of the paper. At t=0, the loop starts rotating about the common diameter as axis with a constant angular velocity ω in the magnetic field. Which of the following options is/are correct? |
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Answer» A circular insulated copper wire loop is twisted to form two loops of area A and 2A as shown in the figure. At the point of crossing the wires remain electrically insulated from each other. The entire loop lies in the plane (of the paper). A uniform magnetic field B point into the plane of the paper. At t=0, the loop starts rotating about the common diameter as axis with a constant angular velocity ω in the magnetic field. Which of the following options is/are correct? |
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| 35. |
A 5kg body is rotated in a vertical circle with with a constant speed of 4m/s using a string of length 1m , when the tension in the string is 31N , then the body will be |
| Answer» A 5kg body is rotated in a vertical circle with with a constant speed of 4m/s using a string of length 1m , when the tension in the string is 31N , then the body will be | |
| 36. |
Also, if we pack a proton and anelectron together in a small volume, the combinationdoes not attract or repel another electron or protonplaced at a distance.what does this line mean?source: hc verma |
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Answer» Also, if we pack a proton and an electron together in a small volume, the combination does not attract or repel another electron or proton placed at a distance. what does this line mean? source: hc verma |
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| 37. |
The rectangular coil having 100 turns is placed in a uniform magnetic field of 0.05√2^j T as shown in figure. Find the torque acting on the loop. |
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Answer» The rectangular coil having 100 turns is placed in a uniform magnetic field of 0.05√2^j T as shown in figure. Find the torque acting on the loop. |
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| 38. |
A theodolite is set up at station A and 3 m long staff is is held vertically at station B. The depression angle reading at 2.5 m marking on the staff is 6∘10′. The horizontal distance between A and B is 2200 m. Height of instrument at station A is 1.1 m and R.L of A is 880.88 m. Apply the curvature and refraction correction, and determine the R.L of B (in m)642.105 |
Answer» A theodolite is set up at station A and 3 m long staff is is held vertically at station B. The depression angle reading at 2.5 m marking on the staff is 6∘10′. The horizontal distance between A and B is 2200 m. Height of instrument at station A is 1.1 m and R.L of A is 880.88 m. Apply the curvature and refraction correction, and determine the R.L of B (in m)
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| 39. |
Fill in the blanks(1) The phenomenon of splitting of light into its component colours is _______(2) Very fine particles mainly scatter _______ light.(3) The phenomenon of change in the _______ of light when it passes from one transparent medium to another is refraction.(4) The refractive index depends upon the _______ of propagation of light in different media. |
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Answer» Fill in the blanks (1) The phenomenon of splitting of light into its component colours is _______ (2) Very fine particles mainly scatter _______ light. (3) The phenomenon of change in the _______ of light when it passes from one transparent medium to another is refraction. (4) The refractive index depends upon the _______ of propagation of light in different media. |
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| 40. |
what is Iojap character? |
| Answer» what is Iojap character? | |
| 41. |
A ray of light is sent along the line x-2y-3=0 upon reaching the line 3x-2y-5=0 the ray is reflected from it, find the equation of the line containing the reflected ray. |
| Answer» A ray of light is sent along the line x-2y-3=0 upon reaching the line 3x-2y-5=0 the ray is reflected from it, find the equation of the line containing the reflected ray. | |
| 42. |
A transformer has turns ratio, NSNP=4. A 200 V AC voltage is applied across its primary coil, carrying a current of 1 A. Find the current in the circuit, connected to the secondary coil, if the transformer is 80% efficient. |
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Answer» A transformer has turns ratio, NSNP=4. A 200 V AC voltage is applied across its primary coil, carrying a current of 1 A. Find the current in the circuit, connected to the secondary coil, if the transformer is 80% efficient. |
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| 43. |
1) the magnification produced by a spherical lens is + 2.5 . What is the 1)nature of the image 2)nature of the lens |
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Answer» 1) the magnification produced by a spherical lens is + 2.5 . What is the 1)nature of the image 2)nature of the lens |
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| 44. |
131.To increase the frequency from 50Hz to 200Hz the tension in the vibrating string increases to |
| Answer» 131.To increase the frequency from 50Hz to 200Hz the tension in the vibrating string increases to | |
| 45. |
6. A charge +Q is uniformly distributed on a circular disc of radius R. The disc rotates with constant angular speed w about its own axis. The magnetic field at the centre of the disc is[assume that the disc is in the X-Y plane and rotates in anticlockwise direction] |
| Answer» 6. A charge +Q is uniformly distributed on a circular disc of radius R. The disc rotates with constant angular speed w about its own axis. The magnetic field at the centre of the disc is[assume that the disc is in the X-Y plane and rotates in anticlockwise direction] | |
| 46. |
three charge -q ,Q and -q are placed in a straight line as shown.the total potential energy of the system is zero ,then what is value of Q/ |
| Answer» three charge -q ,Q and -q are placed in a straight line as shown.the total potential energy of the system is zero ,then what is value of Q/ | |
| 47. |
IS THERE ANY DIFFRENCE IN EQUIVALENT WEIGHT AND EQUIVALENT MASS ?? |
| Answer» IS THERE ANY DIFFRENCE IN EQUIVALENT WEIGHT AND EQUIVALENT MASS ?? | |
| 48. |
Two stone of masses in the ratio of 2:3 fall through the heights in the ratio of 4:9 respectively. The ratio of their momenta is (1) 2:3 (2) 4:9 (3) 1:1 (4) 3:2 |
| Answer» Two stone of masses in the ratio of 2:3 fall through the heights in the ratio of 4:9 respectively. The ratio of their momenta is (1) 2:3 (2) 4:9 (3) 1:1 (4) 3:2 | |
| 49. |
What is a source of energy? What are the two main categories of the sources of energy? |
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Answer» What is a source of energy? What are the two main categories of the sources of energy? |
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| 50. |
(a) What is long-sightedness ? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show : (i) the eye-defect long-sightedness. (ii) correction of long-sightedness by using a lens. (b) An eye has a near point distance of 0.75 m. What short of lens in spectacles would be needed to reduce the near point distance to 0.25 m ? Also calculate the power of lens required. Is this eye long-sighted or short-sighted ? (c) An eye has a far point of 2 m. What type of lens in spectacles would be needed to increase the far point to infinity ? Also calculate the power of lens required. Is this eye long-sighted or short-sighted ? |
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Answer» (a) What is long-sightedness ? State the two causes of long-sightedness (or hypermetropia). With the help of ray diagrams, show : |
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