CUET Physics Mock Test Unit II Current Electricity Set B

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Mock Test for CUET Physics Unit II Current Electricity

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Unit II Current Electricity Mock Test for CUET Physics

1. Emf of a cell is

the maximum potential difference between the terminals of a cell when no current is drawn from the cell. the force required to push the electrons in the circuit. the potential difference between the positive and negative terminal of a cell in a closed circuit. less than terminal potential difference of the cell.

2. An energy source will supply a constant current into the load if its internal resistance is

very large as compared to the load resistance equal to the resistance of the load non-zero but less than the resistance of the load zero

3. Kirchoff’s first law, i.e., S i : 0 at a junction, deals with the conservation of

charge energy momentum angular momentum

4. In meter bridge or Wheatstone bridge for measurement of resistance, the known and the unknown resistance are interchanged. The error so removed is

end correction index error due to temperature effect random error

5. A hank of uninsulated wire consisting of seven and a half turns is stretched between two nails hammered into a board to which the ends of the wire are fixed. The resistance of the circuit between the nails is determined with the help of electrical measuring instruments. Determine the proportion in which the resistance will change if the wire is unwound so that the ends remain to be fixed to the nails.

225 15 240 250

6. Two cells of emfs approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.

The battery that runs the potentiometer should have voltage of 8V. The battery of potentiometer can have a voltage of 15 V and R adjusted so that the potential drop across the wire slightly exceeds 10 V. The first portion of 50 cm of wire itself should have a potential drop of 10 V. Potentiometer is usually used for comparing resistances and not voltages.

7. Potentiometer measures potential more accurately because

it measures potential in open circuit it uses sensitive galvanometer for null deflection it uses high resistance potentiometer wire it measures potential in closed circuit

8. What is the suitable material for electric fuse?

Cu Constantan Tin-lead alloy Nichrome

9. Appliances based on heating effect of current work on

only a.c. only d.c. both a.c. and d.c. None of these

10. A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves

Potential gradients A condition of no current flow through the galvanometer A combination of cells, galvanometer and resistances Cells

11. The current which is assumed to be flowing in a circuit from positive terminal to negative, is called

direct current pulsating current conventional current alternating current

12. When a potential difference V is applied across a conductor at a temperature T, the drift velocity of electrons is proportional to

V V T T

13. With increase in temperature the conductivity of

metals increases and of semiconductor decreases. semeconductors increases and metals decreases. in both metals and semiconductors increases. in both metal and semiconductor decreases.

14. Sensitivity of potentiometer can be increased by

increasing the e.m.f of the cell increasing the length of the potentiometer decreasing the length of the potentiometer wire None of these

15. If in the experiment of Wheatstone’s bridge, the positions of cells and galvanometer are interchanged, then balance point will

change remain unchanged depend on the internal resistance of cell and resistance of galvanometer None of these

16. A current passes through a wire of nonuniform crosssection.Which of the following quantities are independent of the cross-section?

The charge crossing Drift velocity Current density Free-electron density

17. We are able to obtain fairly large currents in a conductor because

the electron drift speed is usually very large the number density of free electrons is very high and this can compensate for the low values of the electron drift speed and the very small magnitude of the electron charge the number density of free electrons as well as the electron drift speeds are very large and these compensate for the very small magnitude of the electron charge the very small magnitude of the electron charge has to be divided by the still smaller product of the number density and drift speed to get the electric current

18. To minimise the power loss in the transmission cables connecting the power stations to homes and factories, the transmission cables carry current

at a very low voltage. at a very high voltage at 220 volt neither at a very high voltage nor at a very low voltage.

19. In potentiometer a balance point is obtained, when

the e.m.f. of the battery becomes equal to the e.m.f of the experimental cell the p.d. of the wire between the +ve end of battery to jockey becomes equal to the e.m.f. of the experimental cell the p.d. of the wire between +ve point of cell and jockey becomes equal to the e.m.f. of the battery the p.d. across the potentiometer wire becomes equal to the e.m.f. of the battery

20. A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

both the length and the radius of the wire are halved. both the length and the radius of the wire are doubled. the radius of the wire is doubled. the length of the wire is doubled.

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CUET Physics Unit II Current Electricity Mock Test

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Mock Tests for Physics CUET Unit II Current Electricity

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