Nuclei — Physics STD 12 Science — Question

A cable of resistance 10 Ω carries electric power from a generator producing 250 kW at 10000 volt. The current in the cable is(a) 25 A   (b) 250 A
 (c) 100 A (d) 1000 A

A perpendicular material is place in a magnetic fields. Consider the following statemetns:

1. If the magnetic field is increased, the magnetization is increased.
2. If the temperature is increased, the magnetization is increased.

SI unit of the magnetic field is _________.

A beam of monochromatic blue light of wavelength 4200Å in air travels in water (μ = 4/3). Its wavelength in water will be(a) 2800 Å (b) 5600 Å (c) 3150 Å(d) 4000 Å

Charge is:

Assertion  :  A narrow pulse of light is sent through a medium. The pulse will  retain its shape as it travels through the medium.
Reason      : A narrow pulse is made of harmonic waves with a large range of wavelengths.(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 assertion is false but reason is true.

Find out correct option which describe the Red shift of distant galaxies.

The target used in a Coolidge tube for the production of X-rays is made up of ________ .