IMPORTANT QUESTIONS ------ PHYSICS (SCIENCE)
CLASS X
1. A charge of 400 C flows through a conductor for 1.3 minutes and 20 seconds. Finds the magnitude of the current flowing through the conductor.
2. A charge of 5000 C flows through an electric circuit in 2 hour and 30 minutes. Calculate the magnitude of the current flowing through the circuit.
3. A dry cell can supply a charge of 300 C. If the current is drawn from the cell is 60 mA, find the time in which the cell completely discharges.
4. A battery con supply a charge of 2.5 105 C. If the current is drawn from the battery at a rate of 12.5 A, calculate the time in which the battery will be discharge.
5. A dry cell can supply a charge of 800 c. If a continuous current of 8.0 mA is drawn, calculate the time in which cell will be discharged completely.
6. A charge of 25 mA flows for 2 hour through a conductor. Calculate the number of electrons, which drift in the conductor. [Charge on one electron = 1.6 x 10 – 19 C].
7. Calculate the total number of electrons flowing through a circuit in 20 minutes and 40 seconds, if a current of 40 mA flows through the circuit. [Charge on one electron = 1.6 x 10 -19 C)
8. 2.4 x 10 20 electrons flow through a circuit in 10 hours. Calculate the magnitude of the current. [Charge on one electron = 1.6 x 10–19 C].
9. 50 coulombs of charge is brought from infinity to a given point in an electric field when 62.5 j of work is done. What is the potential at that point?
10. What is the electric potential at a point in an electric field when 24 J of work is done in moving a charge of 84 C from infinity?
11. A charge of 75 C is brought from infinity to a given point in an electric field; when the amount of work done is 12.5 J. Calculate the electric potential at that point.
12. A charge of 2 C is moved in and electric field from infinity to two points A and B. If the work done in bringing the charge to point A is 12j and in bringing it to point B is 16 j. Calculate the potential difference between points A and B.
13. Word of 25J and 30J is dome when 5 C charge is moved from infinity to a point A and then to a point B respectively. Calculate the potential difference between the points A and B.
14. A charge of 25 C is moved from infinity to two points A and B in and electric field. The work done to do so up to A and B is 10 j and 12.5 j respectively. What is the potential difference between points A and B?
15. The resistance of a wire of length 80 cm and of uniform area of cross-section 0.025 cm2,is found to be 1.50ohm. Calculate sp. Resistance of wire.
16. A wire of resistance 4.5ohm and length 150 cm, has area of cross-section of 0.04cm2. Calculate sp. Resistance of wire.
17. What should be the length of nichrome wire of resistance 4.5 ohm, if the length of similar wire is 60 cm and resistance 2.5 ohm?
18. Resistance of a conductor of length 75 cm is 3.25 ohm. Calculate the length of a similar conductor, whose resistance is 16.25 ohm.
19. A nichrome wires has a resistance of 5 ohm. Find the resistance of another nichrome wire, Whose length is four times and area of cross-section three times the first wire.
20. A resistance wire made from German silver has a resistance of 4.25 ohm. Calculate the resistance of another wire, made from same material. Such that its length increases by three times.
21. A nichrome wire of length l and area of cross-section A/4 has a resistance R. Another nichrome wire of length 3l and area of cross-section A/2 has resistance of R1. Find the ratio of R1 and R2 .
22. Write the nature of image formed by a plane mirror.
23. What do you mean by conventional current flow?
24. State Ohm's law. Give its mathematical form. Draw the graph showing the dependence of current on potential difference.
25. When two resistors R1 and R2 connected in parallel to a source of energy, find the equivalent resistance.
26. Why is the series arrangement not used for connecting domestic electric appliances in a circuit?
27. Out of 60 W and 40 W lamps, which one has a higher electrical resistance when in use.
28. Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed:
(a) at 2F1. b) between F1 and the optical centre O of lens.
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