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. |
A particular rsistance wire has a resistance of 3.0 ohm per metre. Find: (a) The total resistance of three lengths of this wire each 1.5 m long, joined in parallel. (b) The potential difference of the battery which gives a current of 2.0 A in each of the 1.5 m length when connected in parallel to the battery (assume that the resistance of battery is negligible). (c) The resistance of 5 m length of a wire of the same material, but with twice the area of cross-section. |
|
Answer» A particular rsistance wire has a resistance of 3.0 ohm per metre. Find: |
|
| 2. |
A solid of mass 50g at 150∘C is placed in 100 g of water at 11∘C when the final temperature recorded is 20∘C. Find the specific heat capacity of solid. SHC of water is 4.2 J/g∘C |
| Answer» A solid of mass 50g at 150∘C is placed in 100 g of water at 11∘C when the final temperature recorded is 20∘C. Find the specific heat capacity of solid. SHC of water is 4.2 J/g∘C | |
| 3. |
What is the reason for the bending of light when it was from rarer to denser towards the normal and when it moves from rarer to denser away from the normal |
| Answer» What is the reason for the bending of light when it was from rarer to denser towards the normal and when it moves from rarer to denser away from the normal | |
| 4. |
The resistance of carbon filament at 0∘C is 104 Ω. It is connected in series to an iron wire. The temperature coefficient of resistance of carbon and iron are −0.0003 / ∘C and +0.0052 / ∘C respectively. What must be the resistance of iron wire so that the combined resistance does not change with temperature? |
|
Answer» The resistance of carbon filament at 0∘C is 104 Ω. It is connected in series to an iron wire. The temperature coefficient of resistance of carbon and iron are −0.0003 / ∘C and +0.0052 / ∘C respectively. What must be the resistance of iron wire so that the combined resistance does not change with temperature? |
|
| 5. |
Five bulbs of 60 W each and 2 fans of 100 W each are used for 8 hours a day. Calculate the monthly bill if 1 kWh is costing Rs 1.50. |
|
Answer» Five bulbs of 60 W each and 2 fans of 100 W each are used for 8 hours a day. Calculate the monthly bill if 1 kWh is costing Rs 1.50. |
|
| 6. |
a) What are the various differences between a real image and a virtual image? b) A 3 cm high object is placed at a distance of 80 cm from a concave lens of focal length 20 cm. Find the position and size of the image. [5 MARKS] |
|
Answer» a) What are the various differences between a real image and a virtual image? |
|
| 7. |
Imagine a concave lens placed in a liquid whose optical density is equal to that of the liquid. What will be the nature of the lens? |
|
Answer» Imagine a concave lens placed in a liquid whose optical density is equal to that of the liquid. What will be the nature of the lens? |
|
| 8. |
Match the following phrases with their meanings: Phrases Meanings at work pay off the cost by doing some work in lieu work out a day one has been waiting for to be on fire to be working the great day excited to be out of money not at all not one bit of not having any money |
||||||||||||||
|
Answer» Match the following phrases with their meanings:
|
|||||||||||||||
| 9. |
Three tuning forks of frequencies 200, 203 and 207 Hzare sounded together. F ind out the beat frequency. |
| Answer» Three tuning forks of frequencies 200, 203 and 207 Hzare sounded together. F ind out the beat frequency. | |
| 10. |
What is nuclear fission ? Explain with an example. Write the equation of the nuclear reaction involved. |
| Answer» What is nuclear fission ? Explain with an example. Write the equation of the nuclear reaction involved. | |
| 11. |
51. If a 60 W bulb and a 100W bulb are connected in series in a circuit, across which bulb will there be a greater voltage drop?How about if they are connected in parallel? |
| Answer» 51. If a 60 W bulb and a 100W bulb are connected in series in a circuit, across which bulb will there be a greater voltage drop?How about if they are connected in parallel? | |
| 12. |
a point source of light placed at the bottom of wide container which is completely filled with liquid of refractive index x. if the area of illuminated circle on surface is equal to square of 2 times depth of the container the x of liquid will b |
| Answer» a point source of light placed at the bottom of wide container which is completely filled with liquid of refractive index x. if the area of illuminated circle on surface is equal to square of 2 times depth of the container the x of liquid will b | |
| 13. |
1 a.m.u. of mass ≈ |
|
Answer» 1 a.m.u. of mass ≈ |
|
| 14. |
The diagram below shows a wheel barrow with a load of 200 N. Calculate the amount of force ‘E’, which will just lift the total weight of 200N |
|
Answer» The diagram below shows a wheel barrow with a load of 200 N. Calculate the amount of force ‘E’, which will just lift the total weight of 200N
|
|
| 15. |
Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the color of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason. |
|
Answer» Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the color of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason. |
|
| 16. |
If Iron man’s particle accelerator has a radius 1π meters and 1011 electrons flow with 2×108 ms speed in the anticlockwise direction, then find the current in the circuit and also its direction. |
|
Answer» If Iron man’s particle accelerator has a radius 1π meters and 1011 electrons flow with 2×108 ms speed in the anticlockwise direction, then find the current in the circuit and also its direction.
|
|
| 17. |
Find out the distance of the image formed by the concave mirror from the pole, if the first image formed by the plane mirror is taken as an object for the given concave mirror. |
|
Answer» Find out the distance of the image formed by the concave mirror from the pole, if the first image formed by the plane mirror is taken as an object for the given concave mirror.
|
|
| 18. |
A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of the paper and on the axis of the coil) is anticlockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to: |
|
Answer» A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of the paper and on the axis of the coil) is anticlockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to: |
|
| 19. |
Under what condition an electron moving through a magnetic field experiences maximum and minimum force? |
| Answer» Under what condition an electron moving through a magnetic field experiences maximum and minimum force? | |
| 20. |
A cell of emf E and internal resistance r is connected across a variable load resistor R draw the plots of terminals voltage V vs (1)R (2)the current I |
| Answer» A cell of emf E and internal resistance r is connected across a variable load resistor R draw the plots of terminals voltage V vs (1)R (2)the current I | |
| 21. |
What kind of energy transformation takes place in a door bell? |
|
Answer» What kind of energy transformation takes place in a door bell? |
|
| 22. |
A real image is formed by a lens. What can be said about the magnification produced by the lens? |
|
Answer» A real image is formed by a lens. What can be said about the magnification produced by the lens? |
|
| 23. |
A labour carries 10 sacks of cement of 25 kg each one by one on the third floor of a building with five identical floors (1 ground floor and 4 floors). If height of the building is 100 m, the work done by the labour against gravity in carrying the sacks of cement is (take g =10m/s^2) |
| Answer» A labour carries 10 sacks of cement of 25 kg each one by one on the third floor of a building with five identical floors (1 ground floor and 4 floors). If height of the building is 100 m, the work done by the labour against gravity in carrying the sacks of cement is (take g =10m/s^2) | |
| 24. |
In the circuit shown, the variable resistance is so adjusted that the ammeter reading is same in both the position 1 and 2 of the key the reading of ammeter is 2 A. If E=10 V and internal resistance=0, then find x. (in ohm) |
Answer» In the circuit shown, the variable resistance is so adjusted that the ammeter reading is same in both the position 1 and 2 of the key the reading of ammeter is 2 A. If E=10 V and internal resistance=0, then find x. (in ohm) |
|
| 25. |
Whenever a liquid is heated in a container, expansion in liquid as well as container takes place. If r is the volume expansion coefficient of liquid and is coefficient of liner expansion. Match the entries of Column I and Column II Column IColumn II(i) Liquid level rises with respect to container(A) g=2a(ii) Liquid level remains same with respect to container(B) 2α<γ<3α(iii) Liquid level drops with respect to container(C) g=3a(iv) Liquid level remains same with respect to ground(D) g>3a |
|
Answer» Whenever a liquid is heated in a container, expansion in liquid as well as container takes place. If r is the volume expansion coefficient of liquid and is coefficient of liner expansion. Match the entries of Column I and Column II |
|
| 26. |
What is the minimum temperature difference required between the water at surface and 2 km depth to efficiently operate ocean thermal energy conversion plants? |
|
Answer» What is the minimum temperature difference required between the water at surface and 2 km depth to efficiently operate ocean thermal energy conversion plants? |
|
| 27. |
Why do we observe random wavering or flicking of the objects near a fire or on a very hot day? |
|
Answer» Why do we observe random wavering or flicking of the objects near a fire or on a very hot day? |
|
| 28. |
Explain the term critical angle with the aid of a labeled diagram. |
|
Answer» Explain the term critical angle with the aid of a labeled diagram. |
|
| 29. |
What is the proof if that angle of incidence =angle of reflection |
| Answer» What is the proof if that angle of incidence =angle of reflection | |
| 30. |
8.An under water swimmer is at a depth of 12m below the surface of water.A bird is height of 18m from the surface of water directly above of his eyes.for the swimmer the birds appear at the distance from the surface of water is equal to the( refractive index of water is 4/3) |
| Answer» 8.An under water swimmer is at a depth of 12m below the surface of water.A bird is height of 18m from the surface of water directly above of his eyes.for the swimmer the birds appear at the distance from the surface of water is equal to the( refractive index of water is 4/3) | |
| 31. |
calculate the force if a sheet of thickness d will be placed between the charges q1 and q |
| Answer» calculate the force if a sheet of thickness d will be placed between the charges q1 and q | |
| 32. |
what are the steps that we must follow to fill the electrons in molecular orbital ? |
| Answer» what are the steps that we must follow to fill the electrons in molecular orbital ? | |
| 33. |
Explain the construction and working of(1) Electric motor(2) Electric generator. |
|
Answer» Explain the construction and working of (1) Electric motor (2) Electric generator. |
|
| 34. |
what is Lami theorem |
| Answer» what is Lami theorem | |
| 35. |
A heavy chain of length 1m and weight Wong hangs vertically with one end attached to a peg and carries a block of mass 10kg at other and.find the workdone in winding 50cm of chain round the peg |
| Answer» A heavy chain of length 1m and weight Wong hangs vertically with one end attached to a peg and carries a block of mass 10kg at other and.find the workdone in winding 50cm of chain round the peg | |
| 36. |
Two spherical bodies of mass M and 5M and radii R and 2R are released in free space with initial separation between their centres equal to 12 R. If they attract each other due to gravitational force only, then the distance covered by the smaller body before collision is |
| Answer» Two spherical bodies of mass M and 5M and radii R and 2R are released in free space with initial separation between their centres equal to 12 R. If they attract each other due to gravitational force only, then the distance covered by the smaller body before collision is | |
| 37. |
66.a body of mass 2 kg is rotating in a vertical circle of radius 4 metre. the difference in its kinetic energy at the top and bottom of the circle is |
| Answer» 66.a body of mass 2 kg is rotating in a vertical circle of radius 4 metre. the difference in its kinetic energy at the top and bottom of the circle is | |
| 38. |
What is the role of a split ring in an electric motor? [3 MARKS] |
|
Answer» What is the role of a split ring in an electric motor? [3 MARKS] |
|
| 39. |
Surface of the retina of eye? |
| Answer» Surface of the retina of eye? | |
| 40. |
What is transmutation? |
|
Answer» What is transmutation? |
|
| 41. |
WHAT IS A CHARGE |
| Answer» WHAT IS A CHARGE | |
| 42. |
Which of the following represent the magnetic lines of force near an isolated north pole of a bar magnet? |
|
Answer» Which of the following represent the magnetic lines of force near an isolated north pole of a bar magnet?
|
|
| 43. |
If a body has a charge of magnitude 8×10–19 coulomb what is the correct combination of protons and electrons on it? |
|
Answer» If a body has a charge of magnitude 8×10–19 coulomb what is the correct combination of protons and electrons on it? |
|
| 44. |
What is the function of crystalline lens in human eye? |
|
Answer» What is the function of crystalline lens in human eye? |
|
| 45. |
Sound travels fastest in ______. |
|
Answer» Sound travels fastest in ______. |
|
| 46. |
Cyclotron frequency does not depend on 1. Radius 2. Velocity 3. Magnetic induction 4. None |
| Answer» Cyclotron frequency does not depend on 1. Radius 2. Velocity 3. Magnetic induction 4. None | |
| 47. |
The domestic use of solar cells is limited due to ________. |
|
Answer» The domestic use of solar cells is limited due to ________. |
|
| 48. |
At what height from the earth ,acceleration due to gravity will be half the value of g on the earth ? |
| Answer» At what height from the earth ,acceleration due to gravity will be half the value of g on the earth ? | |
| 49. |
An object 5cm in length is held 25cm away from the converging lens of focal length 10cm. Draw the Ray diagram and find the position, size and nature of the image formed |
|
Answer» An object 5cm in length is held 25cm away from the converging lens of focal length 10cm. Draw the Ray diagram and find the position, size and nature of the image formed |
|
| 50. |
The equivalent resistance between A and B (of the circuit as shown in figure) is |
|
Answer» The equivalent resistance between A and B (of the circuit as shown in figure) is |
|
