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. |
Explain with a neat diagram the coil-coil experiment demonstrating electromagnetic induction. |
|
Answer» Explain with a neat diagram the coil-coil experiment demonstrating electromagnetic induction. |
|
| 2. |
Name the bacteria whose presence in water indicates the contamination with disease-causing micro-organisms. |
|
Answer» Name the bacteria whose presence in water indicates the contamination with disease-causing micro-organisms. |
|
| 3. |
A vertical ray of light strikes the horizontal surface of some water : (a) What is the angle of incidence ? (b) What is the angle of refraction ? |
|
Answer» A vertical ray of light strikes the horizontal surface of some water : (a) What is the angle of incidence ? (b) What is the angle of refraction ? |
|
| 4. |
A cart of weight 10 N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N [parallel to the ramp], raising the cart 0.50 m above its initial level. Calculate the percent efficiency of the work. |
|
Answer» A cart of weight 10 N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N [parallel to the ramp], raising the cart 0.50 m above its initial level. Calculate the percent efficiency of the work. |
|
| 5. |
Define the term refractive index of a medium. Can it be less than 1? |
|
Answer» Define the term refractive index of a medium. Can it be less than 1? |
|
| 6. |
The splitting of white light into its constituent colors is called___. |
|
Answer» The splitting of white light into its constituent colors is called |
|
| 7. |
Why do only big nuclei undergo nuclear fission reaction? |
|
Answer» Why do only big nuclei undergo nuclear fission reaction? |
|
| 8. |
What is the ideal mechanical advantage of a single fixed pulley? Can it be used as a force multiplier? |
|
Answer» What is the ideal mechanical advantage of a single fixed pulley? Can it be used as a force multiplier? |
|
| 9. |
Explain Coriolis force. |
|
Answer» Explain Coriolis force. |
|
| 10. |
Which type of mirror is used in a solar furnace and support your answer. |
|
Answer» Which type of mirror is used in a solar furnace and support your answer. |
|
| 11. |
An electric lamp is labelled 12 V, 36 W. This indicates that it should be used with a 12 V supply. What other information does the label provide? |
|
Answer» An electric lamp is labelled 12 V, 36 W. This indicates that it should be used with a 12 V supply. What other information does the label provide? |
|
| 12. |
What is Fuel ? (2 marks) |
|
Answer» What is Fuel ? (2 marks) |
|
| 13. |
A convex lens of focal length 40 cm and a concave lens of focal length 25 cm are placed in contact in such a way that they have the common principal axis. Find the power of the combination. |
|
Answer» A convex lens of focal length 40 cm and a concave lens of focal length 25 cm are placed in contact in such a way that they have the common principal axis. Find the power of the combination. |
|
| 14. |
A block and tackle system has 5 pulleys. If an effort of 1250 N is needed in the downward direction to raise a load of 5000 N calculate(a) M.A. (b) V.R.(c)efficiency of the system. Also find the magnitude of extra force needed to overcome the friction. |
|
Answer» A block and tackle system has 5 pulleys. If an effort of 1250 N is needed in the downward direction to raise a load of 5000 N calculate(a) M.A. (b) V.R.(c)efficiency of the system. Also find the magnitude of extra force needed to overcome the friction. |
|
| 15. |
Why there appears a North Pole whenever the current is flowing in anti clock direction in a loop and vice versa? |
| Answer» Why there appears a North Pole whenever the current is flowing in anti clock direction in a loop and vice versa? | |
| 16. |
Consider the following statements: Statement 1: Radioactivity is affected by external agents like temperature, pressure, electric and magnetic fields etc. Statement 2: The activity of the material has been shown to be the result of the three different kinds of radiations α, β, and γ. |
|
Answer» Consider the following statements: Statement 1: Radioactivity is affected by external agents like temperature, pressure, electric and magnetic fields etc. Statement 2: The activity of the material has been shown to be the result of the three different kinds of radiations α, β, and γ. |
|
| 17. |
A fish is swimming in a river at a depth of 20 cm from the surface of the water. Refractive Index of water is 4/3. The depth at which an eagle flying above the water sees the fish is ___ . |
|
Answer» A fish is swimming in a river at a depth of 20 cm from the surface of the water. Refractive Index of water is 4/3. The depth at which an eagle flying above the water sees the fish is |
|
| 18. |
A wire of length 80 cm under some tension produces sound of frequency 256 Hz. What length of wire will produce sound of frequency 1024 Hz under same tension? |
|
Answer» A wire of length 80 cm under some tension produces sound of frequency 256 Hz. What length of wire will produce sound of frequency 1024 Hz under same tension? |
|
| 19. |
A ray of light is incident on a plane mirror at an angle of incidence of 30∘. The deviation produced by the mirror is |
|
Answer» A ray of light is incident on a plane mirror at an angle of incidence of 30∘. The deviation produced by the mirror is |
|
| 20. |
There is a black spot on a table. A glass slab of thickness 6 cm is placed on the table over the spot. Refractive index of glass is 3/2. At what depth from the upper surface will the spot appear when viewed from above? |
|
Answer» There is a black spot on a table. A glass slab of thickness 6 cm is placed on the table over the spot. Refractive index of glass is 3/2. At what depth from the upper surface will the spot appear when viewed from above? |
|
| 21. |
The given diagram shows an electron gun of a hot cathode ray tube. A 6 V dc source and a 1000 V dc source are available. To obtain a focused beam of fast moving electrons the 6 V and 1000 V sources should be utilized such that |
|
Answer» The given diagram shows an electron gun of a hot cathode ray tube.
A 6 V dc source and a 1000 V dc source are available. To obtain a focused beam of fast moving electrons the 6 V and 1000 V sources should be utilized such that |
|
| 22. |
The electrical gadgets used in a house such as bulbs, fans, heater, etc., are always connected in parallel, NOT in series. The reason for connecting them in parallel is: |
|
Answer» The electrical gadgets used in a house such as bulbs, fans, heater, etc., are always connected in parallel, NOT in series. The reason for connecting them in parallel is: |
|
| 23. |
The central portion of a lens is wrapped in black paper as shown below. An object is placed at 90 cm with the center of curvature at 40 cm. Find the nature of image formed. |
|
Answer»
The central portion of a lens is wrapped in black paper as shown below. An object is placed at 90 cm with the center of curvature at 40 cm. Find the nature of image formed. |
|
| 24. |
Among animals, the predators (like lions) have their eyes facing forward at the front of their heads, whereas the animals of prey (like rabbit) usually have eyes at the sides of their head. Why is this so ? |
| Answer» Among animals, the predators (like lions) have their eyes facing forward at the front of their heads, whereas the animals of prey (like rabbit) usually have eyes at the sides of their head. Why is this so ? | |
| 25. |
Two objects of different masses released from rest at the same time falling freely near the surface of moon would ___. |
|
Answer» Two objects of different masses released from rest at the same time falling freely near the surface of moon would ___. |
|
| 26. |
A batsman hits two balls of different masses 0.5 kg and 1 kg out of the stadium, the velocity with which these balls travel is the same. What would be the ratio of their kinetic energies? |
|
Answer» A batsman hits two balls of different masses 0.5 kg and 1 kg out of the stadium, the velocity with which these balls travel is the same. What would be the ratio of their kinetic energies? |
|
| 27. |
Infrared radiations are preferred over ordinary visible light for taking photographs in fog because |
|
Answer» Infrared radiations are preferred over ordinary visible light for taking photographs in fog because |
|
| 28. |
How resistance increases during short circuiting? |
| Answer» How resistance increases during short circuiting? | |
| 29. |
A steam at 100oC is slowly cooled and converted to ice at −10oC. Which of the following curves represents the phenomenon qualitatively? |
|
Answer» A steam at 100oC is slowly cooled and converted to ice at −10oC. Which of the following curves represents the phenomenon qualitatively? |
|
| 30. |
Which of the following is not correct w.r.t. delta connection? |
|
Answer» Which of the following is not correct w.r.t. delta connection? |
|
| 31. |
A solid sphere of uniform density and radius 4 units is located with its centre at the origin O. Two spheres of equal radii 1 unit, with their centres at A (- 2, 0, 0) and B (2, 0, 0) respectively are taken out of the solid leaving behind spherical cavities as shown in the figure. Then choose the incorrect statement. |
|
Answer» A solid sphere of uniform density and radius 4 units is located with its centre at the origin O. Two spheres of equal radii 1 unit, with their centres at A (- 2, 0, 0) and B (2, 0, 0) respectively are taken out of the solid leaving behind spherical cavities as shown in the figure. Then choose the incorrect statement. |
|
| 32. |
What type of vibration is executed in each of the following cases 1) A ‘swing’ given a push and then let go. 2) A tuning fork of frequency made to vibrate by another tuning fork also of frequency |
|
Answer» What type of vibration is executed in each of the following cases 1) A ‘swing’ given a push and then let go. 2) A tuning fork of frequency made to vibrate by another tuning fork also of frequency |
|
| 33. |
The crystalline lens of people at old age becomes milky and cloudy. This condition is called: |
|
Answer» The crystalline lens of people at old age becomes milky and cloudy. This condition is called: |
|
| 34. |
A material of resistivity ρ is formed in the shape of a truncated cone of altitude h. The top end has a radius "a" while bottom end has a radius "b". Assuming a uniform current density through any circular cross-section of the cone, find the resistance between the two ends. |
|
Answer» A material of resistivity ρ is formed in the shape of a truncated cone of altitude h. The top end has a radius "a" while bottom end has a radius "b". Assuming a uniform current density through any circular cross-section of the cone, find the resistance between the two ends. |
|
| 35. |
Why can you not use a concave mirror as a rear-view mirror in vehicles ? |
|
Answer» Why can you not use a concave mirror as a rear-view mirror in vehicles ? |
|
| 36. |
If you are standing between 2 plane mirrors, inclined to each other at 60∘. Find number of images that you can see of yourself. |
|
Answer» If you are standing between 2 plane mirrors, inclined to each other at 60∘. Find number of images that you can see of yourself. |
|
| 37. |
The four resistors each of 1ohm are connected as shown below. What will be the equivalent resistance between A and B? |
|
Answer» The four resistors each of 1ohm are connected as shown below. What will be the equivalent resistance between A and B?
|
|
| 38. |
When some potential difference is maintained between A and B, current I enters the network at A and leaves at B. Find i) the current flowing between C and D. ii) the equivalent resistance between A and B. |
|
Answer» When some potential difference is maintained between A and B, current I enters the network at A and leaves at B. Find i) the current flowing between C and D. ii) the equivalent resistance between A and B.  |
|
| 39. |
Name a machine for each of the following use : (a) to multiply the force, (b) to change the point of application of force, (c) to change the direction of force, (d) to obtain the gain in speed. |
|
Answer» Name a machine for each of the following use : (a) to multiply the force, (b) to change the point of application of force, (c) to change the direction of force, (d) to obtain the gain in speed. |
|
| 40. |
In a moving coil microphone electric signals are generated___. |
|
Answer» In a moving coil microphone electric signals are generated |
|
| 41. |
The figure shows two tuning forks A and B of the same frequency mounted on two separate sound boxes with their open ends facing each other. The fork A is set into vibration. (a) Describe your observation. (b) State the principle illustrated by this experiment. |
|
Answer» The figure shows two tuning forks A and B of the same frequency mounted on two separate sound boxes with their open ends facing each other. The fork A is set into vibration. (a) Describe your observation. (b) State the principle illustrated by this experiment.
|
|
| 42. |
Which of these is an example of fossil fuel? |
|
Answer» Which of these is an example of fossil fuel? |
|
| 43. |
A man weighs 600 N at the equator, but when he moves to the pole he observes a slight increase in his weight. This is because: |
|
Answer» A man weighs 600 N at the equator, but when he moves to the pole he observes a slight increase in his weight. This is because: |
|
| 44. |
The value of acceleration due to gravity |
|
Answer» The value of acceleration due to gravity |
|
| 45. |
On adding FeCl3 solution into NaOH solution, a possitively charged colloidal sol is obtained when they are in |
|
Answer» On adding FeCl3 solution into NaOH solution, a possitively charged colloidal sol is obtained when they are in |
|
| 46. |
Why do the stars twinkle but planets don't? |
|
Answer» Why do the stars twinkle but planets don't? |
|
| 47. |
Ice pellets are also known as ___ . |
|
Answer» Ice pellets are also known as |
|
| 48. |
In the spectrum of white light, how many colours have a wavelength less than that of yellow colour? |
|
Answer» In the spectrum of white light, how many colours have a wavelength less than that of yellow colour? |
|
| 49. |
Why should elements in periodic table be arranged in increasing order of atomic no. And not atomic mass. |
|
Answer» Why should elements in periodic table be arranged in increasing order of atomic no. And not atomic mass. |
|
| 50. |
Question 139 A half-life is the amount of time that it takes for a radioactive substance to decay one-half of its original quantity. Suppose radioactive decay causes 300 grams of a substance to decrease 300×2−3 grams after 3 half-lives. Evaluate 300×2−3 to determine how many grams of the substance is left. Explain why the expression 300×2−n can be used to find the amount of the substance that remains after n half-lives. |
|
Answer» Question 139 A half-life is the amount of time that it takes for a radioactive substance to decay one-half of its original quantity. |
|
