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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. |
What colours lie on the two sides of the 'green colour' in the spectrum of white light ? |
| Answer» What colours lie on the two sides of the 'green colour' in the spectrum of white light ? | |
| 2. |
Define focus and principal focus of a lens. Derive mirror formula for a concave mirror when image formed is (i) real (ii) virtual. Also give the sign convention used. [5 MARKS] |
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Answer» Define focus and principal focus of a lens. Derive mirror formula for a concave mirror when image formed is (i) real (ii) virtual. Also give the sign convention used. [5 MARKS] |
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| 3. |
China successfully launches earth observation satellite Gaofen-4.Which of the following statement(s) is/are wrong? Code: |
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Answer» China successfully launches earth observation satellite Gaofen-4.Which of the following statement(s) is/are wrong? Code: |
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| 4. |
Why is the orientation of portable radio with respect to broadcasting system important? |
| Answer» Why is the orientation of portable radio with respect to broadcasting system important? | |
| 5. |
If voltage is work done per charge and electric potential is the wrk done to move a charge from a reference point to infinity point . Are they same ? |
| Answer» If voltage is work done per charge and electric potential is the wrk done to move a charge from a reference point to infinity point . Are they same ? | |
| 6. |
Why do clouds appear white or greyish in color? Why not any other particular color? |
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Answer» Why do clouds appear white or greyish in color? Why not any other particular color? |
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| 7. |
Two bodies of mass 1 kg and 5 kg are dropped gently from the top of a tower. At a point 50 cm from the ground the bodies will have same |
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Answer» Two bodies of mass 1 kg and 5 kg are dropped gently from the top of a tower. At a point 50 cm from the ground the bodies will have same |
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| 8. |
Refraction of light in the eye occurs at : (a) the lens only (b) the cornea only (c) both the cornea and the lens (d) the pupil |
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Answer» Refraction of light in the eye occurs at : (a) the lens only (b) the cornea only (c) both the cornea and the lens (d) the pupil |
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| 9. |
The most exploited nonrenewable resource is- |
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Answer» The most exploited nonrenewable resource is- |
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| 10. |
Which energy can be harnessed from the sea? 1. Tidal energy 2. Wave energy 3. Ocean thermal energy 4. Solar energy 5. Geothermal energy |
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Answer» Which energy can be harnessed from the sea? 1. Tidal energy 2. Wave energy 3. Ocean thermal energy 4. Solar energy 5. Geothermal energy |
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| 11. |
Which of the following power plants are based on the gravity of earth? |
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Answer» Which of the following power plants are based on the gravity of earth? |
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| 12. |
Fill in the following blanks with suitable words : (a) Parallel rays of light are refracted by a convex lens to a point called the___ (b) The image in a convex lens depends upon the distance of the ___ from the lens. |
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Answer» Fill in the following blanks with suitable words : (a) Parallel rays of light are refracted by a convex lens to a point called the |
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| 13. |
What is the order of the seven colour that we see after dispersion through a glass prism? |
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Answer» What is the order of the seven colour that we see after dispersion through a glass prism? |
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| 14. |
plz help to understand these 1) what is the difference between Resistance and resistivity? 2)what is variable resistance and why it is required? 3)what is rheostat? |
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Answer» plz help to understand these 1) what is the difference between Resistance and resistivity? 2)what is variable resistance and why it is required? 3)what is rheostat? |
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| 15. |
A monochromatic point source of light 'O' is seen through a rectangular glass block ABCD. Paths of two rays, in and outside the block, are shown in the given figure. How does the shift depend on the thickness (AD or BC) of the block? |
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Answer» A monochromatic point source of light 'O' is seen through a rectangular glass block ABCD. Paths of two rays, in and outside the block, are shown in the given figure.
How does the shift depend on the thickness (AD or BC) of the block? |
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| 16. |
Three appliances are connected in parallel to the same source which provides a voltage of 220 V. A fuse connected to the source will blow if the current from the source exceeds 10 A. If the the three appliances are rated at 60 W, 500 W and 1200 W at 220 V, will the fuse blow ? |
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Answer» Three appliances are connected in parallel to the same source which provides a voltage of 220 V. A fuse connected to the source will blow if the current from the source exceeds 10 A. If the the three appliances are rated at 60 W, 500 W and 1200 W at 220 V, will the fuse blow ? |
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| 17. |
Radioactive radiations are of three types out of these one radiation remains unaffected by an electric or magnetic fields. Name this radiation. |
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Answer» Radioactive radiations are of three types out of these one radiation remains unaffected by an electric or magnetic fields. Name this radiation. |
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| 18. |
If the specific heat of a substance is infinite, it means |
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Answer» If the specific heat of a substance is infinite, it means |
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| 19. |
What are the advantages of tidal energy? |
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Answer» What are the advantages of tidal energy? |
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| 20. |
What are e-wastes? |
| Answer» What are e-wastes? | |
| 21. |
Which of the following equation shows the correct relationship between electrical units? 1 A = 1C/s or 1 C = 1 A /s |
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Answer» Which of the following equation shows the correct relationship between electrical units? |
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| 22. |
Name three common power plants. |
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Answer» Name three common power plants. |
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| 23. |
What impact does atmospheric refraction have on sunrise and sunset? |
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Answer» What impact does atmospheric refraction have on sunrise and sunset? |
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| 24. |
Which part of the human eye provides most of the refraction for the light rays entering the eye? |
| Answer» Which part of the human eye provides most of the refraction for the light rays entering the eye? | |
| 25. |
Name the colour code of the wire which is connected to (i) metallic body of an appliance, (ii) switch for the appliance. |
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Answer» Name the colour code of the wire which is connected to (i) metallic body of an appliance, (ii) switch for the appliance. |
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| 26. |
A geyser is rated '1500 W, 250 V'. This geyser is connected to 250 V mains. Calculate : (i) the current drawn (ii) the energy consumed in 50 hours and (iii) the cost of energy consumed at Rs. 4.20 per kWh. |
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Answer» A geyser is rated '1500 W, 250 V'. This geyser is connected to 250 V mains. Calculate : (i) the current drawn (ii) the energy consumed in 50 hours and (iii) the cost of energy consumed at Rs. 4.20 per kWh. |
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| 27. |
(a) For which colour of white light, is the refractive index of a transparent medium (i) the least, (ii) the most? (b) Which colour of light travels fastest in any medium except air? |
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Answer» (a) For which colour of white light, is the refractive index of a transparent medium (i) the least, (ii) the most? (b) Which colour of light travels fastest in any medium except air? |
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| 28. |
Draw the magnetic field lines representing the uniform magnetic field. |
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Answer» Draw the magnetic field lines representing the uniform magnetic field. |
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| 29. |
difference between voltage and current?? |
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Answer» difference between voltage and current?? |
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| 30. |
Does the resistance as well as the specific resistance of an alloy remain constant with increase in temperature? Is the case with nichrome wire the same? |
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Answer» Does the resistance as well as the specific resistance of an alloy remain constant with increase in temperature? Is the case with nichrome wire the same? |
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| 31. |
Around a current carrying wire, there is a ___. |
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Answer» Around a current carrying wire, there is a |
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| 32. |
A resistance of 25Ω is connected to a 12 V battery. Calcuate the heat energy in joules generated per minute. |
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Answer» A resistance of 25Ω is connected to a 12 V battery. Calcuate the heat energy in joules generated per minute. |
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| 33. |
Calculate the mechanical advantage and velocity ratio if there are 2 movable pulleys and one fixed pulley arrangement system. |
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Answer» Calculate the mechanical advantage and velocity ratio if there are 2 movable pulleys and one fixed pulley arrangement system. |
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| 34. |
When four hydrogen nuclei combine to form a helium nucleus at the core of our Sun, about 0.01643 a.m.u. of mass is lost, The approximate amount of energy released in the process, is: |
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Answer» When four hydrogen nuclei combine to form a helium nucleus at the core of our Sun, about 0.01643 a.m.u. of mass is lost, The approximate amount of energy released in the process, is: |
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| 35. |
Calculate the time required to melt a certain mass of ice at -100C completely, if it takes 20 minutes for the same mass of water at 00C to become water at 850C, using the same heater. |
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Answer» Calculate the time required to melt a certain mass of ice at -100C completely, if it takes 20 minutes for the same mass of water at 00C to become water at 850C, using the same heater. |
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| 36. |
If the current flowing through a fixed resistor is halved, the heat produced in it will become: (a) double (b) one - half (c) one fourth (d) four times |
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Answer» If the current flowing through a fixed resistor is halved, the heat produced in it will become: |
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| 37. |
A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is (2/3). Their equivalent focal length is 30 cm. What are their individual focal lengths (in cm)? |
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Answer» A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is (2/3). Their equivalent focal length is 30 cm. What are their individual focal lengths (in cm)? |
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| 38. |
What type of conductor is glass? |
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Answer» What type of conductor is glass? |
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| 39. |
An inverted image can be seen by using a convex mirror under what circumstances? |
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Answer» An inverted image can be seen by using a convex mirror under what circumstances? |
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| 40. |
A ball is thrown up from the top of a tower at 20 m/s velocity. It took the ball 6 sec to fall to the bottom. How high is the tower? For how long was the ball above the tower? |
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Answer» A ball is thrown up from the top of a tower at 20 m/s velocity. It took the ball 6 sec to fall to the bottom. How high is the tower? For how long was the ball above the tower? |
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| 41. |
A student wants to project the image of a candle flame on the walls of school laboratory by using a lens: (a) Which type of lens should be use and why? (b) At what distance in terms of focal length 'F' of the lens should be place the candle flame so as to get (i) a magnified, and (ii) a diminished imaged respectively on the wall? (c) Draw ray diagram to show the formation of the image in each case? |
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Answer» A student wants to project the image of a candle flame on the walls of school laboratory by using a lens: |
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| 42. |
An object of height 2.0 cm is placed at a distance 20 cm in front of a concave mirror of focal length 12 cm. Find the position, size and nature of the image. |
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Answer» An object of height 2.0 cm is placed at a distance 20 cm in front of a concave mirror of focal length 12 cm. Find the position, size and nature of the image. |
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| 43. |
(a) Complete the following in the diagram of a transformer and name the parts labelled A and B. (b) Name the part you have drawn to complete the diagram in part (a). (c) What is the material of the part named above? (d) Is this transformer a step-up or step-down? Give reason. |
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Answer» (a) Complete the following in the diagram of a transformer and name the parts labelled A and B. (c) What is the material of the part named above?
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| 44. |
An oil – tanker explodes on the surface of the sea. At that instant, an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio(air:water) of the time taken by sound waves to reach them. (Speed of sound in air = 340 ms−1 and speed of sound in seawater= 1360 ms−1) |
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Answer» An oil – tanker explodes on the surface of the sea. At that instant, an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio(air:water) of the time taken by sound waves to reach them. (Speed of sound in air = 340 ms−1 and speed of sound in seawater= 1360 ms−1) |
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| 45. |
What is a sound wave? |
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Answer» What is a sound wave? |
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| 46. |
A uniform sphere of mass M and radius R exerts a force F on a small mass m situated at a distance of 2R from the centre O of the sphere. A spherical portion of diameter R is cut from the sphere as shown in the figure. The force of attraction between the remaining part of the sphere and the mass m will be |
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Answer» A uniform sphere of mass M and radius R exerts a force F on a small mass m situated at a distance of 2R from the centre O of the sphere. A spherical portion of diameter R is cut from the sphere as shown in the figure. The force of attraction between the remaining part of the sphere and the mass m will be |
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| 47. |
An electric iron is connected to the mains power supply of 220 V. When the electric iron is adjusted at minimum heating it consumes a power of 360 W but at maximum heating it takes a power of 840 W. Calculate the current and resistance in each case. |
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Answer» An electric iron is connected to the mains power supply of 220 V. When the electric iron is adjusted at minimum heating it consumes a power of 360 W but at maximum heating it takes a power of 840 W. Calculate the current and resistance in each case. |
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| 48. |
The emission line spectrum of atomic hydrogen arises from the energies given out when |
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Answer» The emission line spectrum of atomic hydrogen arises from the energies given out when |
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| 49. |
(a) What do you understand by the change of phase of a substance? (b) Is there any change in temperature during the change of phase? (c) Does the substance absorb or liberate any heat energy during the change of phase? |
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Answer» (a) What do you understand by the change of phase of a substance? (b) Is there any change in temperature during the change of phase? (c) Does the substance absorb or liberate any heat energy during the change of phase? |
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| 50. |
Five resistors each of 3Ω, are connected as shown in the figure below. Calculate the resistance : (a) Between points P and Q (b) Between points X and Y [4 MARKS] |
Answer» Five resistors each of 3Ω, are connected as shown in the figure below. Calculate the resistance : (a) Between points P and Q (b) Between points X and Y [4 MARKS] |
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