WBJEE - Physics (Category - 3) Model Test
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Question 1 |
When a potential difference is applied across, the current passing through
A | an insulator at 0 K is zero
|
B | a semi-conductor at 0 K is zero |
C | a metal at 0 K is finite |
D | a p-n diode at 300 K is finite, if it is reverse-biased |
Question 2 |
A bi-convex lens of focal length 10 cm is cut along the horizontal diameter and the two halves are kept 2 mm apart symmetrically about the optical axis as shown in the figure. A monochromatic point source of light is now placed at a distance 10 cm on the optical axis. Then which of the following statements is/are correct?
A | The rays emerging from each lens-half will be converging to a point on the optical axis at a distance of 10 /3 cm from the lens-halves |
B | The rays emerging from each lens-half will be parallel making an angle of 10sup>-2 radian with the optical axis |
C | Rays from each lens-half will be diverging as if the source is on the optic axis at a distance of 10/3 cm behind the lens-halves |
D | The rays emerging from the upper lens-half will appear to come from a point 10 cm behind the lens-halves and 1 mm below the optical axis |
Question 3 |
A circuit consists of three batteries of e.m.f. E1 = 1V, E2 = 2V and E3 = 3V respectively and internal resistance of r = 1 Ω each connected in parallel as shown in figure.
A | The equivalent e.m.f. of the three batteries is Eeq = 2V |
B | Internal resistance of the equivalent battery is 1 / 3 Ω |
C | Potential difference between the points P and Q is VPQ = 2V |
D | Current flowing through the branch containing E1 =1V battery is i1 = 0 amp |
Question 4 |
A moving coil galvanometer has a resistance of 100 Ω and shows full-scale deflection at a current of 100 μA. The galvanometer has to be used as an ammeter in the range of 0–100 mA so that 100 mA is the full-scale deflection current. A resistance R has to be connected in parallel. Then
A | the value of R should be 0.10 Ω
|
B | when this new ammeter measures 100 mA current, the current through the galvanometer is 100 μA |
C | for higher current measurement, the value of R should be larger than the present value of R |
D | this new ammeter can measure both +100mA and -100mA |
Question 5 |
An experiment to measure Y with a set of four wires of same material and same mass but of different lengths and diameters were performed using a frictionless pulling arrangement as shown. Different masses were used to create tension for the measurement of length-extension of each wire. In this experiment, which of the following quantities do /does not vary linearly?
A | For a given applied mass, the extension of length vs diameter of wire |
B | For a given applied mass, the extension of length vs length of the wires |
C | For all wires, the extension of length versus applied mass |
D | For same amount of extension of length of all wires, length of wire vs. the elastic potential energy |
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