In the following common emitter configuration an NPN transistor with current gain b = 100 is used. The output voltage of the amplifier will be
|
(a) 10 mV |
(b) 0.1 V |
(c) 1.0 V |
(d) 10 V |
(c) 1.0 V
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An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm The size of the image is
|
(a) 9.2 cm |
(b) 10.5 cm |
(c) 5.6 cm |
(d) 7.5 cm |
The plates of parallel plate capacitor are charged upto 100 V. A 2mm thick plate is inserted between the plates. Then to maintain the same potential difference, the distance between the plates is increased by 1.6 mm. The dielectric constant of the plate is
|
(a) 5 |
(b) 1.25 |
(c) 4 |
(d) 2.5 |
A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and the wire radius halved, the electrical power dissipated would be
|
(a) Halved |
(b) The same |
(c) Doubled |
(d) Quadrupled |
A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/ quantities constant along the length of the conductor is/are
|
(a) Current, electric field and drift speed |
(b) Drift speed only |
|
(c) Current and drift speed |
(d) Current only |
Which of the following cannot cause fission in a heavy nucleus
| (a) a-particle | (b) Proton | (c) Deutron | (d) Laser rays |
Assertion : The phenomenon of X-ray production is basically inverse of photoelectric effect.
Reason : X-rays are electromagnetic waves.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |