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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. |
The current passing through an electric kettle has been doubled. The heat produced will become: (a) half (b) double (c) four times (d) one - fourth |
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Answer» The current passing through an electric kettle has been doubled. The heat produced will become: |
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| 2. |
Define the term "power of accommodation" of human eye. |
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Answer» Define the term "power of accommodation" of human eye. |
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| 3. |
Question 2 An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain. |
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Answer» Question 2 An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain. |
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| 4. |
In a hydro power plant, ________ energy is converted into electrical energy. |
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Answer» In a hydro power plant, ________ energy is converted into electrical energy. |
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| 5. |
Question 13 A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24Ω resistances, which may be used separately, in series, or in parallel. What are the currents in the three cases? |
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Answer» Question 13 A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24Ω resistances, which may be used separately, in series, or in parallel. What are the currents in the three cases? |
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| 6. |
Energy released in Sun and Stars is due to |
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Answer» Energy released in Sun and Stars is due to |
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| 7. |
While an athlete is running at a constant acceleration of 4.5ms2, he exerts a force of 300 N. What is the mass of the athlete? |
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Answer» While an athlete is running at a constant acceleration of 4.5ms2, he exerts a force of 300 N. What is the mass of the athlete? |
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| 8. |
What is the shape of a current-carrying conductor whose magnetic field pattern resembles that of a bar magnet ? |
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Answer» What is the shape of a current-carrying conductor whose magnetic field pattern resembles that of a bar magnet ? |
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| 9. |
After being dispersed form a prism, a white light splits into seven colours. Which colour will be refracted the most? |
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Answer» After being dispersed form a prism, a white light splits into seven colours. Which colour will be refracted the most? |
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| 10. |
Calculate the mechanical advantage of a lever in which the effort arm is 50 cm and the load arm is 2cm ___. |
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Answer» Calculate the mechanical advantage of a lever in which the effort arm is 50 cm and the load arm is 2cm |
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| 11. |
Which one has the higher refractive index, cooler air or hotter air? |
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Answer» Which one has the higher refractive index, cooler air or hotter air? |
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| 12. |
A ray of light passes from vacuum into a medium of refractive index μ. If the angle of incidence is found to be twice the angle of refraction, then the angle of incidence is:(sin2r=2sinr cosr) |
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Answer» A ray of light passes from vacuum into a medium of refractive index μ. If the angle of incidence is found to be twice the angle of refraction, then the angle of incidence is:(sin2r=2sinr cosr) |
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| 13. |
Which of the following is not a mode of transport? |
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Answer» Which of the following is not a mode of transport? |
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| 14. |
Sun appears red at sunrise and sunset. This is due to light having _________ gets scattered away. |
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Answer» Sun appears red at sunrise and sunset. This is due to light having _________ gets scattered away. |
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| 15. |
A convex lens of focal length 12 cm produces a magnification of -1. The object should be placed at; |
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Answer» A convex lens of focal length 12 cm produces a magnification of -1. The object should be placed at; |
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| 16. |
A boy pulls a trolley with 6 N force at an angle of 60∘ from ground to move the trolley 10m. Find the work done by the boy. |
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Answer» A boy pulls a trolley with 6 N force at an angle of 60∘ from ground to move the trolley 10m. Find the work done by the boy. |
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| 17. |
On a winter day the temperature of the tap water is 20∘C whereas the room temperature is 5∘C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature ? Take g=10 ms−2 |
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Answer» On a winter day the temperature of the tap water is 20∘C whereas the room temperature is 5∘C. Water is stored in a tank of capacity 0.5 m3 for household use. If it were possible to use the heat liberated by the water to lift a 10 kg mass vertically, how high can it be lifted as the water comes to the room temperature ? Take g=10 ms−2 |
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| 18. |
Do lenses have centre of curvature, if yes then how can we define it? |
| Answer» Do lenses have centre of curvature, if yes then how can we define it? | |
| 19. |
[Sir, madam, this is a very silly question. Please don't be irritated] Consider the protons of a metallic conductor as ants (for easy understanding) standing in a straight line without moving. The sea of electrons moving within the conductor are food grain pass from one to the one next. With this analogy can u describe what will be current, voltage, direct current, alternating current, electric potential, potential difference, resistence, resistivity. |
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Answer» [Sir, madam, this is a very silly question. Please don't be irritated] Consider the protons of a metallic conductor as ants (for easy understanding) standing in a straight line without moving. The sea of electrons moving within the conductor are food grain pass from one to the one next. With this analogy can u describe what will be current, voltage, direct current, alternating current, electric potential, potential difference, resistence, resistivity. |
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| 20. |
What will happen to a ray of light if it falls normally on a surface? |
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Answer» What will happen to a ray of light if it falls normally on a surface? |
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| 21. |
what are charge carriers in a metallic wire known |
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Answer» what are charge carriers in a metallic wire known |
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| 22. |
Two resistance wires on joining in parallel, the resultant resistance is 6 Ω. One of the wire breaks. The effective resistance is 2 Ω. The resistance of the broken wire was |
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Answer» Two resistance wires on joining in parallel, the resultant resistance is 6 Ω. One of the wire breaks. The effective resistance is 2 Ω. The resistance of the broken wire was |
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| 23. |
Question 1 (e) Fill in the blank: An image formed by a concave ________________ cannot be obtained on a screen. |
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Answer» Question 1 (e) |
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| 24. |
Way of harness of wind energy |
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Answer» Way of harness of wind energy |
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| 25. |
The switch is connected to the live wire. Give reasons. (2 marks) |
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Answer» The switch is connected to the live wire. Give reasons. (2 marks) |
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| 26. |
Why does the light follows the laws of reflection even on rough surfaces? |
| Answer» Why does the light follows the laws of reflection even on rough surfaces? | |
| 27. |
Rainbow is formed by splitting of sunlight in water droplets. There are millions of raindrops but we can see only one rainbow. Why is it so???? |
| Answer» Rainbow is formed by splitting of sunlight in water droplets. There are millions of raindrops but we can see only one rainbow. Why is it so???? | |
| 28. |
Why focal length of convex mirror and convex lens is positive while concave mirror and concave lens negative? |
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Answer» Why focal length of convex mirror and convex lens is positive while concave mirror and concave lens negative? |
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| 29. |
The linear magnification of a convex mirror is 12.5 cm. How far is its center of curvature (i) from the pole (ii) from the focus |
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Answer» The linear magnification of a convex mirror is 12.5 cm. How far is its center of curvature (i) from the pole (ii) from the focus |
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| 30. |
Two wires A and B of equal masses and of the same metal are taken. The length of the wire A is half the length of the wire B. If the resistance of the wire A is 24 ohm, the resistances of wire B will be- |
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Answer» Two wires A and B of equal masses and of the same metal are taken. The length of the wire A is half the length of the wire B. If the resistance of the wire A is 24 ohm, the resistances of wire B will be- |
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| 31. |
The speed of efflux from an open tank is given by a formula identical to that of a: |
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Answer» The speed of efflux from an open tank is given by a formula identical to that of a: |
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| 32. |
According to Henry’s Law: At constant temperature, the mass of gas dissolved in a fixed volume of liquid is __ proportional to the pressure of the gas on the surface of the liquid. |
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Answer» According to Henry’s Law: At constant temperature, the mass of gas dissolved in a fixed volume of liquid is |
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| 33. |
The energy change would you expect to take place in the molecules of a substance when it undergoes a change in its state without any change in its temperature is |
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Answer» The energy change would you expect to take place in the molecules of a substance when it undergoes a change in its state without any change in its temperature is |
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| 34. |
Suggest how your irises help to protect the retinas of your eyes from damage by bright light. |
| Answer» Suggest how your irises help to protect the retinas of your eyes from damage by bright light. | |
| 35. |
The focal length of a convex lens is 25 cm. What is its power ? |
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Answer» The focal length of a convex lens is 25 cm. What is its power ? |
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| 36. |
Most of the overhead current-carrying wires along the roads do not have a plastic covering like the wires used at homes. Choose the most appropriate reason for no substantial loss of energy in such wires. |
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Answer» Most of the overhead current-carrying wires along the roads do not have a plastic covering like the wires used at homes. Choose the most appropriate reason for no substantial loss of energy in such wires. |
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| 37. |
Magnification produced by a concave lens is always : (a) more than 1 (b) equal to 1 (c) less than 1 (d) more than 1 or less than 1 |
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Answer» Magnification produced by a concave lens is always : (a) more than 1 (b) equal to 1 (c) less than 1 (d) more than 1 or less than 1 |
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| 38. |
(a) What do you understand by the terms 'direct current' and 'alternating current' ? (b) Name some sources of direct current and some of alternating current. (c) Stated an important advantage of alternating current over direct current. (d) What is the frequency of A.C. supply in India ? |
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Answer» (a) What do you understand by the terms 'direct current' and 'alternating current' ? (b) Name some sources of direct current and some of alternating current. (c) Stated an important advantage of alternating current over direct current. (d) What is the frequency of A.C. supply in India ? |
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| 39. |
Carbon dioxide in the atmosphere contributes to global warming by: Code: |
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Answer» Carbon dioxide in the atmosphere contributes to global warming by: Code: |
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| 40. |
Calculate the electricity bill amount for a month of 31 days, if the following devices are used as specified: a) 3 bulbs of 30 watts for 5 hours b) 4 tube lights of 50 watts for 8 hours c) 1 fridge of 300 watts for 24 hours Given the rate of electricity is 2 Rs. per unit. |
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Answer» Calculate the electricity bill amount for a month of 31 days, if the following devices are used as specified: |
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| 41. |
A uniform magnetic field exists in the plane of paper point from left to right as shown in figure. In the field, an electron and a proton move as shown. The electron and the proton experience forces which are |
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Answer» A uniform magnetic field exists in the plane of paper point from left to right as shown in figure. In the field, an electron and a proton move as shown. The electron and the proton experience forces which are |
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| 42. |
On addition of 0.8 mL of solution of 10% NaCl to 30 mL of red gold sol in presence of 0.03 g of starch, the coagulation is just prevented. The gold number of starch is |
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Answer» On addition of 0.8 mL of solution of 10% NaCl to 30 mL of red gold sol in presence of 0.03 g of starch, the coagulation is just prevented. The gold number of starch is |
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| 43. |
A concave lens of focal length (f) forms an image which is n times the size of the object. The distance of the object from the lens is |
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Answer» A concave lens of focal length (f) forms an image which is n times the size of the object. The distance of the object from the lens is |
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| 44. |
In the displacement method, a convex lens is placed in between an object and a screen. If the magnifications in the two positions are m1 and m2 and the displacement of the lens between the two positions is x, then the focal length of the lens is |
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Answer» In the displacement method, a convex lens is placed in between an object and a screen. If the magnifications in the two positions are m1 and m2 and the displacement of the lens between the two positions is x, then the focal length of the lens is |
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| 45. |
What is meant by momentum? |
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Answer» What is meant by momentum? |
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| 46. |
50g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10g of water, then the rise in its temperature (in ∘C ) is: (Specific heat of copper=420 J kg−1 K−1, Specific heat of water =4186 J kg−1 K−1)5 |
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Answer» 50g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10g of water, then the rise in its temperature (in ∘C ) is: (Specific heat of copper=420 J kg−1 K−1, Specific heat of water =4186 J kg−1 K−1)
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| 47. |
Statement 1: Coal petroleum, natural gas all comprises fossil fuels. Statement 2: They are called fossil as they are made from dead remains of organic matter. |
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Answer» Statement 1: Coal petroleum, natural gas all comprises fossil fuels. Statement 2: They are called fossil as they are made from dead remains of organic matter. |
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| 48. |
In Factors affecting current or the flow of charges explain me the third factor, that is, The state at which the atoms of the conductor are in the lattice. What is the meaning of "state at which the atoms of the conductor" . |
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Answer» In Factors affecting current or the flow of charges explain me the third factor, that is, The state at which the atoms of the conductor are in the lattice. What is the meaning of "state at which the atoms of the conductor" . |
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| 49. |
An object 5 cm high is placed at a distance of 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of image. |
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Answer» An object 5 cm high is placed at a distance of 60 cm in front of a concave mirror of focal length 10 cm. Find the position and size of image. |
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| 50. |
A transparent solid cylindrical rod has a refractive index of 2√3. It is surrounded by air. A light ray is incident at the mid point of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is |
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Answer» A transparent solid cylindrical rod has a refractive index of 2√3. It is surrounded by air. A light ray is incident at the mid point of one end of the rod as shown in the figure. |
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