Dakshana Mock Test Season VII

Dakshana Mock Test Season VII

1] An electric current passes through a circuit containing two wires of the same material connected in parallel. If the lengths of the wires are in the ratio of 4:3 and radii of the wires are in the ratio of 2:3, then the ratio of the currents passing through the wires will be:

i. 3
ii. 1:3
iii. 8:9
iv. None of these

2] The potential difference between points A and B of adjoining figure is:


i. 2V/3
ii. 8V/9
iii. 4V/3
iv. 2V

3] From which of the following diagrams we can verify Ohm's law?


i. (i)
ii. (ii)
iii. (iii)
iv. (iv)

4] Find the reading of the ammeter given below.


i. V/2R
ii. 2V/3R
iii. 4V/3R
iv. 11V/R

5] In the electric circuit shown below, the current through the 2.0Ω resistor is 3A. Approximately what is the EMF of the battery?


i. 51V
ii. 42V
iii. 36V
iv. 24V

6] A thin solid conductor with sides PQRS is moving at constant velocity v, at right angles to a uniform magnetic field B, directed into the page as shown.


Which side of the conductor has the greatest concentration of electrons?

i. P
ii. Q
iii. R
iv. S

7] AB and CD are long straight conductors, distance between them is 'd'. State, the correct option about magnetic field on BC , if the current is flowing in AB and CD.


i. is zero at all points
ii. is zero only at its midpoint
iii. has different magnitudes at different points
iv. is maximum at its midpoint

8] A vertical wire carries a current upwards. The magnetic field at a point due north of the wire is directed

i. upward
ii. due south
iii. due west
iv. due east

9] A wire carrying a current 'I' is shaped as shown. Section AB is a quarter-circle of radius 'r'. The magnetic field at C is


i. along the bisector of the angle ACB, away from AB
ii. along the bisector of the angle ACB, towards AB
iii. perpendicular to the plane of paper, direction into the paper
iv. at an angle π/4 to the plane of paper

10] A conductor AB of length 'l', carrying a current 'i' is placed perpendicular to a long straight conductor XY carrying a current I, as shown in the figure. The force on AB will act


i. Upward
ii. Downward
iii. To the right
iv. To the left

11] In the figure, the resistance of rheostat 'R' is decreasing, then the brightness of the bulb 'B' will


i. Increase
ii. Reduce
iii. Remain constant
iv. Information is insufficient

12] Two wires of the same metal has the same length but their cross-sections are in the ratio 3:1. They are joined in series. The resistance of of the thicker wire is 10Ω. The total resistance of the combination will be

i. 40Ω
ii. 40Ω/3
iii. 5Ω/2
iv. 100Ω

13] In this circuit shown the reading of ammeter is 2A. This ammeter has negligible resistance. The value of R equals


i. 2Ω
ii. 4Ω
iii. 6Ω
iv. 8Ω

14] In the network, the current flowing through the resistance R shown in the figure is


i. E/R
ii. E/7R
iii. 3E/7R
iv. 2E/R

15] If a wire is stretched to make it 0.1% longer. The percentage change in its resistance would be

i. zero
ii. 0.1%
iii. 0.2%
iv. 0.4%

16] The reading of ammeter as per figure shown is


i. 1A/8
ii. 3A/4
iii. 2A/3
iv. 1A

17] An infinite ladder network is constructed with 1Ω and 2Ω resistor as shown. The effective resistance between A and B is


i. 1Ω
ii. 2Ω
iii. 3Ω
iv. 4Ω

18] Two identical heater wires of equal length are first connected in series and then in parallel, the ratio of

i. their resistance is 1:1
ii. their resistance is 2:1
iii. the heat produced in them is 1:2
iv. the heat produced in them is 1:4

19] The resistivity of conductor in the form of a wire depends on its

i. length
ii. diameter
iii. material
iv. None of these

20] A steady current flows in a metallic conductor of non uniform cross-section. Which of the following quantities remain constant along the length of the conductor?

i. Current
ii. Drift speed
iii. Current density
iv. Electric field

21] In the circuit shown in figure the rate of heat produced in the 5Ω resistance is 20Js-1. Choose the correct option based on the statements and figure.


i. The current in the 6Ω resistor is 2A
ii. The current in the 5Ω resistor is 1A
iii. The rate of heat produced in the 4Ω resistor is 4Js-1
iv. The potential drop across 4Ω resistor is 8V

22] Figure shows a network of currents. The magnitude of currents is shown here. The current 'I' will be


i. -3A
ii. 3A
iii. 13A
iv. 20A

23] A helium nucleus makes a full rotation in a circle of radius 0.8 metre in two seconds. The value of the magnetic field B at the centre of the circle will be

i. 10-19/μ0
ii. 10-19μ0
iii. 2*10-19μ0
iv. 2*10-19/μ0

24] The magnetic induction at the center O in the figure shown is


i. (μ0i / 4)(1/R1 - 1/R2)
ii. (μ0i / 4)(1/R1 + 1/R2)
iii. (μ0i / 4)(R1 - R2)
iv. (μ0i / 4)(R1 + R2)

25] Find the total resistance between A and B.


i. 3.5Ω
ii. 2.5Ω
iii. 1.5Ω
iv. 5.5Ω







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