- A1 eV
- B14.2 MeV
- ✓931 MeV
- D0.693 MeV
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Three capacitors 2, 3 and 6 mF are joined in series with each other. What is the minimum effective capacitance
|
(a) |
(b) 1 mF |
(c) 2 mF |
(d) 3 mF |
When cathode rays strike a metal target of high melting point with very high velocity, then
| (a) X-rays are produced | (b) Ealpha-rays are produced |
| (c) TV waves are produced |
(d) Ultrasonic waves are produced |
Particle nature and wave nature of electromagnetic waves and electrons can be shown by
|
(a) Electron has small mass, deflected by the metal sheet |
|
(b) X-ray is diffracted, reflected by thick metal sheet |
|
(c) Light is refracted and defracted |
|
(d) Photoelectricity and electron microscopy |
The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings)
|
(a) 2πhc/ |
(b) |
(c) |
(d) 2π |
In the circuit shown, a meter bridge is in its balanced state. The meter bridge wire has a resistance 0.1 ohm/cm. The value of unknown resistance X and the current drawn from the battery of negligible resistance is

|
(a) 6 W, 5 amp |
(b) 10 W, 0.1 amp |
(c) 4 W, 1.0 amp |
(d) 12 W, 0.5 amp |