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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. |
according to ohms law electric current is directly proportional to the potential difference across two ends then its mathematical form should be I~V why is it V~I |
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Answer» according to ohms law electric current is directly proportional to the potential difference across two ends then its mathematical form should be I~V why is it V~I |
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| 2. |
Nowadays, we are using alternate or non-conventional sources of energy more. Why? |
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Answer» Nowadays, we are using alternate or non-conventional sources of energy more. Why? |
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| 3. |
How much heat is generated when current I is passed through a resistor for time t? |
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Answer» How much heat is generated when current I is passed through a resistor for time t? |
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| 4. |
A resistor of 20 cm length and resistance 5 ohm is stretched to a uniform wire of 40 cm length. The resistance now is- |
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Answer» A resistor of 20 cm length and resistance 5 ohm is stretched to a uniform wire of 40 cm length. The resistance now is- |
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| 5. |
Question 16 Which uses more energy, a 250 W TV set in 1 h, or a 1200 W toaster in 10 minutes? |
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Answer» Question 16 Which uses more energy, a 250 W TV set in 1 h, or a 1200 W toaster in 10 minutes? |
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| 6. |
It is easier to turn the steering wheel of a large diameter than that of a small diameter. Give reason. |
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Answer» It is easier to turn the steering wheel of a large diameter than that of a small diameter. Give reason. |
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| 7. |
State two difference between the e.m.f. and terminal voltage of a cell. |
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Answer» State two difference between the e.m.f. and terminal voltage of a cell. |
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| 8. |
I want to know more about nuclear fusion |
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Answer» I want to know more about nuclear fusion |
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| 9. |
One of the following does not contribute to producing acid rain. This one is: (a) sulphur dioxide (b) carbon dioxide (c) nitrogen oxides (d) carbon monoxide |
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Answer» One of the following does not contribute to producing acid rain. This one is: |
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| 10. |
The refractive index of air with respect to glass is expressed as gμa = sin isin r. (a) Write down a similar expression for gμa in terms of the angles i and r. (b) If angle r = 90∘, what is the corresponding angle i called? (c) What is the physical significance of the angle i in part (b)? |
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Answer» The refractive index of air with respect to glass is expressed as gμa = sin isin r. (a) Write down a similar expression for gμa in terms of the angles i and r. (b) If angle r = 90∘, what is the corresponding angle i called? (c) What is the physical significance of the angle i in part (b)? |
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| 11. |
What is an electromagnet ? Name two factors on which the strength of magnetic field of an electro-magnet depends and state how does it depend on the factors stated by you. |
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Answer» What is an electromagnet ? Name two factors on which the strength of magnetic field of an electro-magnet depends and state how does it depend on the factors stated by you. |
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| 12. |
A cell of e.m.f. ε and internal resistance r sends current 1.0 A when it is connected to an external resistance 1.9 Ω but it sends current 0.5 A when it is connected to an external resistance 3.9Ω. Calculate the values of ε and r. |
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Answer» A cell of e.m.f. ε and internal resistance r sends current 1.0 A when it is connected to an external resistance 1.9 Ω but it sends current 0.5 A when it is connected to an external resistance 3.9Ω. Calculate the values of ε and r. |
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| 13. |
What is power of accommodation. How ciliary muscles help in accomodation? |
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Answer» What is power of accommodation. How ciliary muscles help in accomodation? |
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| 14. |
Why is light so special that we can see object through lightwaves but why not soundwaves |
| Answer» Why is light so special that we can see object through lightwaves but why not soundwaves | |
| 15. |
_____ is a precious physical substance which is essential for all living organisms.Water |
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Answer» _____ is a precious physical substance which is essential for all living organisms.
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| 16. |
The blue colour of the sky is due to ____. |
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Answer» The blue colour of the sky is due to ____. |
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| 17. |
What is the difference between a dynamo and an electric motor? |
| Answer» What is the difference between a dynamo and an electric motor? | |
| 18. |
Define One coulomb of charge?? |
| Answer» Define One coulomb of charge?? | |
| 19. |
A boy of height 1m stands in front of a convex mirror. His distance from the mirror is equal its focal length. The height of his image is |
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Answer» A boy of height 1m stands in front of a convex mirror. His distance from the mirror is equal its focal length. The height of his image is |
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| 20. |
Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minium deviation. How is the angle of emergence related to the angle of incidence in this position? |
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Answer» Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minium deviation. How is the angle of emergence related to the angle of incidence in this position? |
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| 21. |
Select the correct labelling of the following electric bell. |
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Answer» Select the correct labelling of the following electric bell.
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| 22. |
(a) A thorium isotope 23390Th undergoes an α - decay and changes to radium. What are the atomic number and mass number of radium produced? (b) If radium undergoes further disintegration and emits two β - particles, represent the reaction in the form of an equation. [3 MARKS] |
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Answer» (a) A thorium isotope 23390Th undergoes an α - decay and changes to radium. What are the atomic number and mass number of radium produced? (b) If radium undergoes further disintegration and emits two β - particles, represent the reaction in the form of an equation. [3 MARKS] |
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| 23. |
Akshit was very thirsty and went to draw water from his water purifier. But he found that the water tank was empty and needed to be refilled. Now, Akshit is wondering how come the water in rivers, lakes, seas and oceans never get over. Can you tell him why the water in these sources never gets over? [3 MARKS] |
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Answer» Akshit was very thirsty and went to draw water from his water purifier. But he found that the water tank was empty and needed to be refilled. Now, Akshit is wondering how come the water in rivers, lakes, seas and oceans never get over. Can you tell him why the water in these sources never gets over? [3 MARKS] |
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| 24. |
The directions of current flowing in the coil of a electromagnet at its ends X and Y are as shown below : (a) What is the polarity of end X ? (b) What is the polarity of end Y ? (c) Name and state the rule which you have used to determine the polarities. |
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Answer» The directions of current flowing in the coil of a electromagnet at its ends X and Y are as shown below :
(a) What is the polarity of end X ? (b) What is the polarity of end Y ? (c) Name and state the rule which you have used to determine the polarities. |
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| 25. |
The main gas which causes the global warming is:- |
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Answer» The main gas which causes the global warming is:- |
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| 26. |
Explain why, filament type electric bulbs are not power efficient. |
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Answer» Explain why, filament type electric bulbs are not power efficient. |
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| 27. |
"The near point of a hypermetropic eye is 1m.what is the power of the lens required to correct this defect?" In this question why the image distance is to be taken as negative,on what basis the negative sign has been chosen? |
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Answer» "The near point of a hypermetropic eye is 1m.what is the power of the lens required to correct this defect?" In this question why the image distance is to be taken as negative,on what basis the negative sign has been chosen? |
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| 28. |
A conductor is moved in a varying magnetic field. Name the law which determines the direction of current induced in the conductor. |
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Answer» A conductor is moved in a varying magnetic field. Name the law which determines the direction of current induced in the conductor. |
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| 29. |
The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown. What will be the observation in G when both the coil and the magnet are moved to the right at the same speed? |
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Answer» The given figure shows a coil connected to a centre zero galvanometer G. The galvanometer shows a deflection to the right when the N-pole of a powerful magnet is moved to the right as shown.
What will be the observation in G when both the coil and the magnet are moved to the right at the same speed? |
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| 30. |
Which of the following phenomenon is associated with total internal reflection? |
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Answer» Which of the following phenomenon is associated with total internal reflection? |
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| 31. |
Which of the following are conductors and which are insulators? Sulphur, Silver, Copper, Cotton, Aluminium, Air, Nichrome, Graphite, Paper, Porcelain, Mercury, Mica, Bakelite, Polythene, Maganin. |
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Answer» Which of the following are conductors and which are insulators? Sulphur, Silver, Copper, Cotton, Aluminium, Air, Nichrome, Graphite, Paper, Porcelain, Mercury, Mica, Bakelite, Polythene, Maganin. |
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| 32. |
Which of the following phenomenon is used in optical fibre? |
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Answer» Which of the following phenomenon is used in optical fibre? |
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| 33. |
How are waves formed? |
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Answer» How are waves formed? |
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| 34. |
Give an example work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position. |
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Answer» Give an example work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position. |
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| 35. |
Which phenomenon is responsible for early sunrise and late sunset? |
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Answer» Which phenomenon is responsible for early sunrise and late sunset? |
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| 36. |
A presbyopic patient has near point as 30 cm and far point as 40cm. The dioptric power for the corrective lens for seeing distant objects is___? |
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Answer» A presbyopic patient has near point as 30 cm and far point as 40cm. The dioptric power for the corrective lens for seeing distant objects is |
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| 37. |
It is better to reuse the jam(glass) bottles instead of recycling. Why? |
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Answer» It is better to reuse the jam(glass) bottles instead of recycling. Why? |
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| 38. |
A uniform magnetic field exists in the plane of paper pointing 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 |
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Answer» A uniform magnetic field exists in the plane of paper pointing 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
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| 39. |
State two applications each of a convex and concave lens. |
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Answer» State two applications each of a convex and concave lens. |
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| 40. |
A 2 kg ball on a string is rotated about a circle of radius 10 m. The maximum tension allowed in the string is 50 N. What is the maximum speed of the ball? |
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Answer» A 2 kg ball on a string is rotated about a circle of radius 10 m. The maximum tension allowed in the string is 50 N. What is the maximum speed of the ball? |
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| 41. |
The function of _____ is to regulate the electric current in an AC generator without the loss of any electric power. |
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Answer» The function of _____ is to regulate the electric current in an AC generator without the loss of any electric power. |
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| 42. |
An electric heater draws a current of 10A from a 220V supply. What is the cost of using the heater 5 hrs per day for 30 days if the cost of 1 unit is RS. 2.50? |
| Answer» An electric heater draws a current of 10A from a 220V supply. What is the cost of using the heater 5 hrs per day for 30 days if the cost of 1 unit is RS. 2.50? | |
| 43. |
What is non-unvantional energy? |
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Answer» What is non-unvantional energy? |
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| 44. |
Why magnetism works? Why a conductor carrying electric current produces a magnetic field? |
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Answer» Why magnetism works? Why a conductor carrying electric current produces a magnetic field? |
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| 45. |
How a charge in acceleration produces a magnetic field |
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Answer» How a charge in acceleration produces a magnetic field |
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| 46. |
Why sun appears before the sun rise and after the sunset. Explain with diagram |
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Answer» Why sun appears before the sun rise and after the sunset. Explain with diagram |
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| 47. |
Mention 2 special features of the material used as an element of an electric iron |
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Answer» Mention 2 special features of the material used as an element of an electric iron |
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| 48. |
What is the frequency in Hz of electromagnetic radiation that has a wavelength of 0.53 m? |
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Answer» What is the frequency in Hz of electromagnetic radiation that has a wavelength of 0.53 m? |
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| 49. |
What is the relationship between the angle of incidence and angle of reflection? |
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Answer» What is the relationship between the angle of incidence and angle of reflection? |
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| 50. |
By how much time is the sunset delayed due to atmospheric refraction? |
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Answer» By how much time is the sunset delayed due to atmospheric refraction? |
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