Electromagnetic Induction — Physics STD 12 Science — Question

For the stability of radiated nucleus:

A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called

(a) Artificial radioactivity

(b) Fusion

(c) Fission

(d) Radioactivity

A prism (μ = 1.5) has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin 48° 36’ = 0.75)

(a) 18° 36’

(b) 20° 30’

(c) 18°

(d) 22°1’

Half life of a radioactive element is 10 days. The time during which quantity remains 1/10 of initial mass will be

(a) 100 days

(b) 50 days

(c) 33 days

(d) 16 days

An electron passing through a potential difference of 4.9 V collides with a mercury atom and transfers it to the first excited state. What is the wavelength of a photon corresponding to the transition of the mercury atom to its normal state

(a) 2050 Å

(b) 2240 Å

(c) 2525 Å

(d) 2935 Å

A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is

(a) Equal to unity	(b) Equal to 1.33
(c) Between unity and 1.33	(d) Greater than 1.33

Wavefront of a wave has direction with wave motion:

...X... is a machine that can build up high voltages of the order of a few million volts. Here, A refers to:

A microammeter has a resistance of 100Ω and full scale range of 50μA. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination

(a) 50 V range with 10kΩ  resistance in series

(b) 10 V range with 200kΩ  resistance in series

(c) 10 mA range with 1Ω  resistance in parallel

(d) 10 mA range with 0.1Ω  resistance in parallel

Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is

(a)

(b) tnc

(c)

(d)