Deviation of 5° is observed from a prism whose angle is small and whose refractive index is 1.5. The angle of prism is
|
(a) 7.5° |
(b) 10° |
(c) 5° |
(d) 3.3° |
(b) 10°
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For a transistor, the current amplification factor is 0.8. The transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA is
|
(a) 6 mA |
(b) 4.8 mA |
(c) 24 mA |
(d) 8 mA |
A parallel plate capacitor has a plate separation of 0.01 mm and use a dielectric (whose dielectric strength is 19 KV/mm) as an insulator. The maximum potential difference that can be applied to the terminals of the capacitor is
|
(a) 190 V |
(b) 290 V |
(c) 95 V |
(d) 350 V |
Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is
|
(a) |
(b) |
(c) |
(d) |
Coherent sources are those sources for which
|
(a) Phase difference remain constant |
|
(b) Frequency remains constant |
|
(c) Both phase difference and frequency remains constant |
|
(d) None of these |
The minimum energy required to excite a hydrogen atom from its ground state is
|
(a) 13.6 eV |
(b) -13.6 eV |
(c) 3.4 eV |
(d) 10.2 eV |
A positively charged ball hangs from a silk thread. We put a positive test charge 
at a point and measure F/, then it can be predicted that the electric field strength E
|
(a) |
(b) |
(c) |
(d) Cannot be estimated |
A rectangular tank of depth 8 meter is full of water (μ = 4/3), the bottom is seen at the depth
|
(a) 6 m |
(b) 8/3 m |
(c) 8 cm |
(d) 10 cm |
The magnetic needle of a tangent galvanometer is deflected at an angle 30o due to a magnet. The horizontal component of earth’s magnetic field 0.34 × 10–4 T is along the plane of the coil. The magnetic intensity is
|
(a) 1.96 × 10–4 T |
(b) 1.96 × 10–5 T |
(c) 1.96 × 104 T |
(d) 1.96 × 105 T |
