For the transistor circuit shown below, if b = 100, voltage drop between emitter and base is 0.7 V then value of VCE will be
|
(a) 10 V |
(b) 5 V |
(c) 13 V |
(d) 0 V |
(c) 13 V
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The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell
|
(a) 1.2 Ω |
(b) 1.3 Ω |
(c) 1.1 Ω |
(d) 1.4 Ω |
In extrinsic P and N-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about
|
(a) 1 |
(b) |
(c) |
(d) |
Choose the correct statement
|
(a) When we heat a semiconductor its resistance increases |
|
(b) When we heat a semiconductor its resistance decreases |
|
(c) When we cool a semiconductor to 0 K then it becomes super conductor |
|
(d) Resistance of a semiconductor is independent of temperature |
The capacities and connection of five capacitors are shown in the adjoining figure. The potential difference between the points A and B is 60 volts . Then the equivalent capacity between A and B and the charge on 5μF capacitance will be respectively
|
(a) 44 μF, 300 μC |
(b) 16 μF, 150 μC |
(c) 15 μF, 200 μC |
(d) 4 μF, 50 μC |
In the figure, an air lens of radii of curvature 10 cm (
= 10 cm) is cut in a cylinder of glass (μ = 1.5). The focal length and the nature of the lens is
|
(a) 15 cm, concave |
(b) 15 cm, convex |
|
(c) ∞, neither concave nor convex |
(d) 0, concave |
A two metre wire is moving with a velocity of 1 m/sec perpendicular to a magnetic field of 0.5 weber/m2. The e.m.f. induced in it will be
|
(a) 0.5 volt |
(b) 0.1 volt |
(c) 1 volt |
(d) 2 volt |
The similarity between the sound waves and light waves is
|
(a) Both are electromagnetic waves |
|
(b) Both are longitudinal waves |
|
(c) Both have the same speed in a medium |
|
(d) They can produce interference |
If a radioactive substance reduces to 
of its original mass in 40 days, what is its half-life
|
(a) 10 days |
(b) 20 days |
(c) 40 days |
(d) None of these |
