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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. |
Question 28How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon? |
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Answer» Question 28 How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon? |
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| 2. |
If five resistances, each of value 0.2 ohm are connected in series, what will be the resultant resistance? |
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Answer» If five resistances, each of value 0.2 ohm are connected in series, what will be the resultant resistance? |
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| 3. |
While performing an experiment on determining the focal length of a convex lens, a student obtains a sharp inverted image of the laboratory window grill on the screen and measures the distance between the screen and the lens. She then repeats the experiment and takes a distant tree as the object in the second case. In order to get a sharp image of the tree on the screen, she will now have to move the screen:(1) slightly nearer to the lens(2) slightly farther away from the lens(3) very close to the lens(4) very far away from the lens |
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Answer» While performing an experiment on determining the focal length of a convex lens, a student obtains a sharp inverted image of the laboratory window grill on the screen and measures the distance between the screen and the lens. She then repeats the experiment and takes a distant tree as the object in the second case. In order to get a sharp image of the tree on the screen, she will now have to move the screen: (1) slightly nearer to the lens (2) slightly farther away from the lens (3) very close to the lens (4) very far away from the lens |
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| 4. |
The SI unit of current is ____. |
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Answer» The SI unit of current is ____. |
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| 5. |
A source of sound is travelling with a velocity of 30 m/s towards a stationary observer. If actual frequency of source is 1000 Hz and the wind is blowing with velocity 20 m/s in a direction at 60∘ with the direction of motion of source, then the apparent frequency heard by observer is (speed of sound is 340 m/s) |
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Answer» A source of sound is travelling with a velocity of 30 m/s towards a stationary observer. If actual frequency of source is 1000 Hz and the wind is blowing with velocity 20 m/s in a direction at 60∘ with the direction of motion of source, then the apparent frequency heard by observer is (speed of sound is 340 m/s) |
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| 6. |
How does the radius of a nucleus vary with mass number? Show that nuclear density in a given nucleus is independent of mass number A. |
| Answer» How does the radius of a nucleus vary with mass number? Show that nuclear density in a given nucleus is independent of mass number A. | |
| 7. |
What is the meaning of that bond is directional in nature. |
| Answer» What is the meaning of that bond is directional in nature. | |
| 8. |
If the preparation of iron from haematite by the reaction with carbon Fe2o3 +c ->fe +co2 how much 80% pure iron couldbe produced from 120kg of 90% pure fe2o3) 1)94.5g 2)74.5kg 3)75.45g 4)94.5kg |
| Answer» If the preparation of iron from haematite by the reaction with carbon Fe2o3 +c ->fe +co2 how much 80% pure iron couldbe produced from 120kg of 90% pure fe2o3) 1)94.5g 2)74.5kg 3)75.45g 4)94.5kg | |
| 9. |
The fuel used in thermal power plants is: |
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Answer» The fuel used in thermal power plants is: |
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| 10. |
When a magnet is moved into a coil how does it induce an emf in the coil and is this the same EMF that is induced in the electrodes of a battery |
| Answer» When a magnet is moved into a coil how does it induce an emf in the coil and is this the same EMF that is induced in the electrodes of a battery | |
| 11. |
A solenoid has a core of material with relative permeability 500 and its windings carry a current 1A.The no. of turns is 500 per metre.What is the magnetisation of the material? |
| Answer» A solenoid has a core of material with relative permeability 500 and its windings carry a current 1A.The no. of turns is 500 per metre.What is the magnetisation of the material? | |
| 12. |
A ray is incident at an angle of incidence i on one surface of a prism (with angle of prism A=90∘) and emerges parallel to the opposite surface. If the refractive index of the material of the prism is2√3, then the angle of incidence is equal to |
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Answer» A ray is incident at an angle of incidence i on one surface of a prism (with angle of prism A=90∘) and emerges parallel to the opposite surface. If the refractive index of the material of the prism is2√3, then the angle of incidence is equal to |
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| 13. |
Two similar magnets of magnetic moments M1&M2 are taken & vibrated in vibration magnetometer with their like pole together 7 unlike together . If ratio of M1/M2=5/3 then ratio of the period is? |
| Answer» Two similar magnets of magnetic moments M1&M2 are taken & vibrated in vibration magnetometer with their like pole together 7 unlike together . If ratio of M1/M2=5/3 then ratio of the period is? | |
| 14. |
Two thick wires and two thin wires, all of the same material and same length, form a souare in three oferentways A, B and C as shown in the figure. With correct connections shown, the magnetic field at the centreof the square is zero in case of |
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Answer» Two thick wires and two thin wires, all of the same material and same length, form a souare in three oferent ways A, B and C as shown in the figure. With correct connections shown, the magnetic field at the centre of the square is zero in case of |
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| 15. |
More the speed, lesser will be the bending of light on refraction. True/False? |
| Answer» More the speed, lesser will be the bending of light on refraction. True/False? | |
| 16. |
Explain in simple terms the meaning of angular velocity and angular displacement |
| Answer» Explain in simple terms the meaning of angular velocity and angular displacement | |
| 17. |
Si unit of Magnetic fleld intensity |
| Answer» Si unit of Magnetic fleld intensity | |
| 18. |
Find the work done to bring 4 particles each of mass 100 gram from large distances to the vertices of a square of side 20 cm |
| Answer» Find the work done to bring 4 particles each of mass 100 gram from large distances to the vertices of a square of side 20 cm | |
| 19. |
A rod of length l is kept parallel to a long wire, carrying a constant current. It is moving away from the wire with a velocity v. Find the emf induced in the rod, at the instant when its distance from the long wire is x. |
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Answer» A rod of length l is kept parallel to a long wire, carrying a constant current. It is moving away from the wire with a velocity v. Find the emf induced in the rod, at the instant when its distance from the long wire is x. |
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| 20. |
OA is an object with image size 4 cm and O'A' is the image of the object. Find the image height and nature of the image formed. |
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Answer» OA is an object with image size 4 cm and O'A' is the image of the object. Find the image height and nature of the image formed. |
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| 21. |
In melde's experiment when tension in the string is 12gwt 4 loops are obtained calculate tension in the string to form 3 loops if all other conditions are remaining the same |
| Answer» In melde's experiment when tension in the string is 12gwt 4 loops are obtained calculate tension in the string to form 3 loops if all other conditions are remaining the same | |
| 22. |
Consider a system consisting of two identical balls each of mass M connected by a light rigid rod as shown in figure. An impulse J = MV is imparted tothe system at one of its ends. The angular velocityof the system would be |
| Answer» Consider a system consisting of two identical balls each of mass M connected by a light rigid rod as shown in figure. An impulse J = MV is imparted tothe system at one of its ends. The angular velocityof the system would be | |
| 23. |
19.a astronomical telescope has objective and eyepeice of focal length 40 cm and 4 cm resp. to veiw an object 200 cm away from the objective, the lenses must be separated by distance? |
| Answer» 19.a astronomical telescope has objective and eyepeice of focal length 40 cm and 4 cm resp. to veiw an object 200 cm away from the objective, the lenses must be separated by distance? | |
| 24. |
137.A block is projected upward from the bottom of an incline, inclination 45 degree, with initial speed u. The block reaches maximum height and then comes back to initial position. What is the value of coefficient of kinetic friction if the block reaches the bottom wih half the speed? |
| Answer» 137.A block is projected upward from the bottom of an incline, inclination 45 degree, with initial speed u. The block reaches maximum height and then comes back to initial position. What is the value of coefficient of kinetic friction if the block reaches the bottom wih half the speed? | |
| 25. |
Magnifying power of a terrestrial telescope of objective lens having focal length 200 cm is 40. Find the length of the telescope when the final image is formed at least distance of distinct vision, Focal length of erecting lens is 3 cm. |
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Answer» Magnifying power of a terrestrial telescope of objective lens having focal length 200 cm is 40. Find the length of the telescope when the final image is formed at least distance of distinct vision, Focal length of erecting lens is 3 cm. |
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| 26. |
50.A conducting disc of radius r rotates about its axis with an angular speed omega in a uniform magnetic field perpendicular to the plane of the disc as shown. A resistance R is connected between centre and the rim of the disc then |
| Answer» 50.A conducting disc of radius r rotates about its axis with an angular speed omega in a uniform magnetic field perpendicular to the plane of the disc as shown. A resistance R is connected between centre and the rim of the disc then | |
| 27. |
147.Derive the formula of power |
| Answer» 147.Derive the formula of power | |
| 28. |
what is thr differencr between equivalent mass of O and equivalent mass of O |
| Answer» what is thr differencr between equivalent mass of O and equivalent mass of O | |
| 29. |
What is ripple factor? |
| Answer» What is ripple factor? | |
| 30. |
What is sonic boom? How is it caused? [2 MARKS] |
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Answer» What is sonic boom? How is it caused? [2 MARKS] |
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| 31. |
Main components of electrical motor are given below. Write their function i) armature ii) field magnet iii) split ring commutator iv) brushes or sliding contact v) battery |
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Answer» Main components of electrical motor are given below. Write their function i) armature ii) field magnet iii) split ring commutator iv) brushes or sliding contact v) battery |
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| 32. |
A 10 cm tall candle when viewed using a convex lens appears to be 30 cm tall as shown in the below figure. The focal length of the lens is 5 cm. The magnitude of distance of the object is _________ cm.3.33 |
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Answer» A 10 cm tall candle when viewed using a convex lens appears to be 30 cm tall as shown in the below figure. The focal length of the lens is 5 cm. The magnitude of distance of the object is _________ cm.
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| 33. |
(Bihar, Stage-l, 2014-15) 90, A body of mass 20 kg falls through a distance of 50 cm. Then the loss in potential energy is [Take 9 9.8 m/s2 (1) 98 joule (3) 980 joule (2) 329 joule (4) 5000 joule |
| Answer» (Bihar, Stage-l, 2014-15) 90, A body of mass 20 kg falls through a distance of 50 cm. Then the loss in potential energy is [Take 9 9.8 m/s2 (1) 98 joule (3) 980 joule (2) 329 joule (4) 5000 joule | |
| 34. |
What are the sources of energy? |
| Answer» What are the sources of energy? | |
| 35. |
In the figure given below, PQ is the object; P /Q/ is its image, AA/ is the position of the mirror. Name the kind of mirror. |
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Answer» In the figure given below, PQ is the object; P /Q/ is its image, AA/ is the position of the mirror. Name the kind of mirror.
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| 36. |
How to calculate current drawn by loaded motor? |
| Answer» How to calculate current drawn by loaded motor? | |
| 37. |
Why magnetic field in a infinte solenoid is half at its end |
| Answer» Why magnetic field in a infinte solenoid is half at its end | |
| 38. |
A wire of 10 ohms is bent to form a closed circle.what is the resistance across a diameter of the circle? |
| Answer» A wire of 10 ohms is bent to form a closed circle.what is the resistance across a diameter of the circle? | |
| 39. |
94. A car battery has emf 12 volt and internal resistance 0.05 ohm. if it supplies 60 ampere current, the terminal voltage of battery will be?? |
| Answer» 94. A car battery has emf 12 volt and internal resistance 0.05 ohm. if it supplies 60 ampere current, the terminal voltage of battery will be?? | |
| 40. |
Question 3An electric iron of resistance 20Ω takes a current of 5 A. Calculate the heat developed in 30 s. |
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Answer» Question 3 An electric iron of resistance 20Ω takes a current of 5 A. Calculate the heat developed in 30 s. |
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| 41. |
The motion of a charged particle can be used to distinguish between a magnetic field and electricfield in a certain region by firing the charge (1) Parallel to the field(2) From opposite directions in 1 option the charge particle will accelerate (if charge is positive) in the presence of elcectric field and in case 2 it will deacelerate in presence of electric field in presence of magnetic field the particle would be undeflected in both the cases , then why option 1 is incorrect |
| Answer» The motion of a charged particle can be used to distinguish between a magnetic field and electricfield in a certain region by firing the charge (1) Parallel to the field(2) From opposite directions in 1 option the charge particle will accelerate (if charge is positive) in the presence of elcectric field and in case 2 it will deacelerate in presence of electric field in presence of magnetic field the particle would be undeflected in both the cases , then why option 1 is incorrect | |
| 42. |
A truss hinged at A and supported on rollers and D is loaded as shown in the figure below.The force in member BC is 6.6 |
Answer» A truss hinged at A and supported on rollers and D is loaded as shown in the figure below.The force in member BC is 
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| 43. |
By sucking through a straw a student can reduce the pressure in his lungs to 750 mm of Hg density 13.6 gcm3 Using the straw he can drink water from glass upto max. depth of |
| Answer» By sucking through a straw a student can reduce the pressure in his lungs to 750 mm of Hg density 13.6 gcm3 Using the straw he can drink water from glass upto max. depth of | |
| 44. |
The most abundant fossil fuel on earth is: |
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Answer» The most abundant fossil fuel on earth is: |
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| 45. |
Find the potential difference between A and B (VA−VB) for the given circuit |
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Answer» Find the potential difference between A and B (VA−VB) for the given circuit |
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| 46. |
In a hydrogen atom the electron makes a transition from (n+1)th level to the nth level. If n>>1, the frequency of radiation emitted is proportional to |
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Answer» In a hydrogen atom the electron makes a transition from (n+1)th level to the nth level. If n>>1, the frequency of radiation emitted is proportional to |
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| 47. |
A point object is placed at a distance of 18 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at 27 cm. Calculate the focal length of the lens. |
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Answer» A point object is placed at a distance of 18 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at 27 cm. Calculate the focal length of the lens. |
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| 48. |
26.the value of two resistors are R1 =(6_0.3) kohm and R2 =10_0.2 kohm .the percentage error in equivalent resistance when they are connected in parallel is? |
| Answer» 26.the value of two resistors are R1 =(6_0.3) kohm and R2 =10_0.2 kohm .the percentage error in equivalent resistance when they are connected in parallel is? | |
| 49. |
What is potential difference? |
| Answer» What is potential difference? | |
| 50. |
Two batteries of different emfs and different internal resistances are connected as shown. What is the voltage across A and B in volts |
Answer» Two batteries of different emfs and different internal resistances are connected as shown. What is the voltage across A and B in volts
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