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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. |
Question 13Paheli set up an experiment using liquid A in the beaker as shown in the figure. She observed that the bulb glows. Then she replaced the liquid A by another liquid B. This time the bulb did not glow. Boojho suggested replacing the bulb by an LED. They observed that the LED glows. Explain. |
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Answer» Question 13 Paheli set up an experiment using liquid A in the beaker as shown in the figure. She observed that the bulb glows. Then she replaced the liquid A by another liquid B. This time the bulb did not glow. Boojho suggested replacing the bulb by an LED. They observed that the LED glows. Explain.  |
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| 2. |
Even currents of very low magnitude can lead to death. Is heat produce by the electric current responsible for the death ? Explain. |
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Answer» Even currents of very low magnitude can lead to death. Is heat produce by the electric current responsible for the death ? Explain. |
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| 3. |
The pupil allows light to pass through it and has a diameter of 2×10^{-3}m.If minimum light intensity that should enter the eye is 1.8×10^{-10}W/m^2,then find the number of photon in the visible range that must enter the pupil to have vision. Wavelength of photon in visible range can be taken as 5,500 A. |
| Answer» The pupil allows light to pass through it and has a diameter of 2×10^{-3}m.If minimum light intensity that should enter the eye is 1.8×10^{-10}W/m^2,then find the number of photon in the visible range that must enter the pupil to have vision. Wavelength of photon in visible range can be taken as 5,500 A. | |
| 4. |
what is newtons law of motions |
| Answer» what is newtons law of motions | |
| 5. |
Write down the approximate range of temperature at which water boils in a pressure cooker. |
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Answer» Write down the approximate range of temperature at which water boils in a pressure cooker. |
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| 6. |
Is M = -v/u or v/u ? |
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Answer» Is M = -v/u or v/u ? |
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| 7. |
A lamp is connected in series with a capacitor. What is the observation for dc and a.c. connectionWhat happens in each case if capacitance is reduced |
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Answer» A lamp is connected in series with a capacitor. What is the observation for dc and a.c. connection What happens in each case if capacitance is reduced |
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| 8. |
Current I is being carried out by an infinite wire passing through origin along the direction i + j + k. Find magnetic field due to the wire at point ( 1m , 0, 0 ) |
| Answer» Current I is being carried out by an infinite wire passing through origin along the direction i + j + k. Find magnetic field due to the wire at point ( 1m , 0, 0 ) | |
| 9. |
Which of the following could be the possible value of the absolute refractive index (n) of a medium? |
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Answer» Which of the following could be the possible value of the absolute refractive index (n) of a medium? |
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| 10. |
The presence of magnetic field at a point can be detected by means of: (a) a strong magnet (b) a solenoid (c) a compass needle (d) a current carrying wire. |
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Answer» The presence of magnetic field at a point can be detected by means of: (a) a strong magnet (b) a solenoid (c) a compass needle (d) a current carrying wire. |
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| 11. |
What is work of resistors in series and parallel combination of circuit |
| Answer» What is work of resistors in series and parallel combination of circuit | |
| 12. |
Hydrogen chloride gas is collected by: |
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Answer» Hydrogen chloride gas is collected by: |
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| 13. |
31. What is the difference between ground state and excited state of ion |
| Answer» 31. What is the difference between ground state and excited state of ion | |
| 14. |
Name the device which converts mechanical energy into electric energy. |
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Answer» Name the device which converts mechanical energy into electric energy. |
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| 15. |
The diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600 nm. Coming from a distant object, the limit of resolution of the telescope is close to- |
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Answer» The diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600 nm. Coming from a distant object, the limit of resolution of the telescope is close to- |
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| 16. |
Which of the following is the correct representation of electrons, protons and neutrons respectively? |
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Answer» Which of the following is the correct representation of electrons, protons and neutrons respectively? |
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| 17. |
Why do objects appear black? |
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Answer» Why do objects appear black? |
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| 18. |
A bulb is placed along the angular bisector of two plane mirrors which are inclined at an angle of 60∘ with each other. The number of images formed is : |
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Answer» A bulb is placed along the angular bisector of two plane mirrors which are inclined at an angle of 60∘ with each other. The number of images formed is : |
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| 19. |
PHYSICS A cell supplies 0.6A to a 2ohm coil And 0.3A to another coil of 8ohm. (Both coils simultaneously) Find the EMF(p.d.) and internal resistance of the entire circuit. |
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Answer» PHYSICS |
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| 20. |
Question 17When does an electric short circuit occur? |
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Answer» Question 17 When does an electric short circuit occur? |
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| 21. |
What are the three R's to save the environment? Explain with one example of each. |
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Answer» What are the three R's to save the environment? Explain with one example of each. |
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| 22. |
A current of 2 A is flowing through a circular coil of radius 1 m.Find the magnitude of magnetic field at the center of the circular coil.[1 Mark] |
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Answer» A current of 2 A is flowing through a circular coil of radius 1 m. |
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| 23. |
A bright object 50 mm high stands on the axis of a concave mirror of focal length 100 mm and at a distance of 300 mm from the concave mirror. How big will the image be ? |
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Answer» A bright object 50 mm high stands on the axis of a concave mirror of focal length 100 mm and at a distance of 300 mm from the concave mirror. How big will the image be ? |
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| 24. |
(a) Why are fuses fitted in the fuse box of a domestic electricity supply ? (b) What device could be used in place of the fuses ? |
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Answer» (a) Why are fuses fitted in the fuse box of a domestic electricity supply ? (b) What device could be used in place of the fuses ? |
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| 25. |
Find the net resistance between a and b, all resistors being r |
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Answer» Find the net resistance between a and b, all resistors being r
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| 26. |
A child walks towards a fixed plane mirror at a speed of 5 km h−1. The velocity of the image with respect to the mirror is - |
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Answer» A child walks towards a fixed plane mirror at a speed of 5 km h−1. The velocity of the image with respect to the mirror is - |
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| 27. |
When a voltmeter and an ammeter are connected one by one across the terminals of a cell respectively measures 5 V and 10 A. Now all meters are removed and only a resistance of 2 Ω is connected across the terminals of the cell. The current flowing through this resistance is: |
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Answer» When a voltmeter and an ammeter are connected one by one across the terminals of a cell respectively measures 5 V and 10 A. Now all meters are removed and only a resistance of 2 Ω is connected across the terminals of the cell. The current flowing through this resistance is: |
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| 28. |
How could you find the focal length of a convex lens rapidly but approximately? |
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Answer» How could you find the focal length of a convex lens rapidly but approximately? |
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| 29. |
if a 220v-40W light is connected with 200v mains then what will be the electric current? |
| Answer» if a 220v-40W light is connected with 200v mains then what will be the electric current? | |
| 30. |
Threats to the geological heritage.Causes(i) ____________________________________________________(ii) ____________________________________________________Effects(i) ____________________________________________________(ii) ____________________________________________________ |
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Answer» Threats to the geological heritage. Causes (i) ____________________________________________________ (ii) ____________________________________________________ Effects (i) ____________________________________________________ (ii) ____________________________________________________
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| 31. |
Why don’t two magnetic lines of force intersect each other? [2 MARKS] |
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Answer» Why don’t two magnetic lines of force intersect each other? [2 MARKS] |
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| 32. |
How does salt bridge maintain electrical neutrality? |
| Answer» How does salt bridge maintain electrical neutrality? | |
| 33. |
Question 7 What is the minimum resistance which can be made using five resistors each of 15Ω? (a) 15Ω (b) 125Ω (c) 110Ω (d) 25Ω |
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Answer» Question 7 |
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| 34. |
A particle is decelerating while moving on a circular path clockwise as shown in the figure. When it is at point A, the direction of its net acceleration is best represented as |
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Answer» A particle is decelerating while moving on a circular path clockwise as shown in the figure. When it is at point A, the direction of its net acceleration is best represented as |
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| 35. |
What is SCINTILLATION EFFECT? |
| Answer» What is SCINTILLATION EFFECT? | |
| 36. |
A man spends 6.4 kJ energy in displacing a body by 64 m in the direction in which he applies force,in 2.5 s.Calculate :(i) the force applied, and (ii) the power spent(in H.P.) by the man. |
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Answer» A man spends 6.4 kJ energy in displacing a body by 64 m in the direction in which he applies force,in 2.5 s.Calculate :(i) the force applied, and (ii) the power spent(in H.P.) by the man. |
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| 37. |
Determine the focal length of the lens with refractive index is given 2 and radius of curvature of two surfaces respectively 20cm and -40cm. |
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Answer» Determine the focal length of the lens with refractive index is given 2 and radius of curvature of two surfaces respectively 20cm and -40cm. |
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| 38. |
5 simple methods/projects to conserve the environment that you can do at home. |
| Answer» 5 simple methods/projects to conserve the environment that you can do at home. | |
| 39. |
40. The velocity of end 'A' of the rigid rod placed between two smooth vertical walls moves with a velocity 'u' along vertical direction. Find out the velocity of the end 'B' of that rod,rod always remains in contact with the vertical wall and also find the velocity of centre of the rod. Also find the equation of the path of centre of rod |
| Answer» 40. The velocity of end 'A' of the rigid rod placed between two smooth vertical walls moves with a velocity 'u' along vertical direction. Find out the velocity of the end 'B' of that rod,rod always remains in contact with the vertical wall and also find the velocity of centre of the rod. Also find the equation of the path of centre of rod | |
| 40. |
What is the difference between longitudinal and lateral velocities of image formed by lenses when object is moving |
| Answer» What is the difference between longitudinal and lateral velocities of image formed by lenses when object is moving | |
| 41. |
Why magnetic field outside solenoid is 0? |
| Answer» Why magnetic field outside solenoid is 0? | |
| 42. |
One meter length of wire carries a constant current. The wire is bent to form a circular loop. The magnetic field at the centre of this loop is B. The same is now to form a circular loop of smaller radius to have four turns in the loop. The magnetic field at the centre of this new loop is nB. Find 'n'. |
| Answer» One meter length of wire carries a constant current. The wire is bent to form a circular loop. The magnetic field at the centre of this loop is B. The same is now to form a circular loop of smaller radius to have four turns in the loop. The magnetic field at the centre of this new loop is nB. Find 'n'. | |
| 43. |
57. Consider the ladder network shown in figure. What should be the value of resistance R, so that effective resistance between A & B becomes independent of number of elements in the combination? |
| Answer» 57. Consider the ladder network shown in figure. What should be the value of resistance R, so that effective resistance between A & B becomes independent of number of elements in the combination? | |
| 44. |
In the figure shown, the ideal switch has been open for a long time. If it is closed at t = 0, then the magnitude of the current (in mA) through the 4 kΩ resistor at t=0+ is .1.25 |
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Answer» In the figure shown, the ideal switch has been open for a long time. If it is closed at t = 0, then the magnitude of the current (in mA) through the 4 kΩ resistor at t=0+ is
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| 45. |
16. 550 kJ/cycle work is done by 1 mol of an ideal gas in a cyclic process. The amount of heat absorbed by the system in one cycle is: |
| Answer» 16. 550 kJ/cycle work is done by 1 mol of an ideal gas in a cyclic process. The amount of heat absorbed by the system in one cycle is: | |
| 46. |
What kind of mirror- concave, convex or plain − would be best suited for use in a solar cooker? and Why? |
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Answer» What kind of mirror- concave, convex or plain − would be best suited for use in a solar cooker? and Why? |
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| 47. |
If Im,n=∫sinmxcosnxdx, then I5,4= |
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Answer» If Im,n=∫sinmxcosnxdx, then I5,4= |
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| 48. |
43. optical fiber having core of refractive index root 3 and cladding of 1.5 refractive index is kept in air.the maximum angle of acceptance is 1.60 2.45 3.30 4.15 |
| Answer» 43. optical fiber having core of refractive index root 3 and cladding of 1.5 refractive index is kept in air.the maximum angle of acceptance is 1.60 2.45 3.30 4.15 | |
| 49. |
Give reasons for the following:(i) The sky appears to be blue during day time to a person on earth.(ii) The sky near the horizon appears to have a reddish hue at the time of sunset and sunrise.(iii) The sky appears dark instead of blue to an astronaut.(iv) The stars appear to twinkle.(v) The planets do not twinkle. |
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Answer» Give reasons for the following: (i) The sky appears to be blue during day time to a person on earth. (ii) The sky near the horizon appears to have a reddish hue at the time of sunset and sunrise. (iii) The sky appears dark instead of blue to an astronaut. (iv) The stars appear to twinkle. (v) The planets do not twinkle. |
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| 50. |
A particle has a million excess of electrons . What is the net charge on the particle ? Is it+ ve or -ve ? |
| Answer» A particle has a million excess of electrons . What is the net charge on the particle ? Is it+ ve or -ve ? | |
