Question

Radioactivity is

(a) Irreversible process

(b) Self disintegration process

(c) Spontaneous process

(d) All of the above

Answer

(d) All of the above

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Refer to the figure. When does the the galvanometer (G) deflect?
Image
Force on any charge due to a number of other charges is the _____ of all the forces on that charge taken one at a time.

A light source approaches the observer with velocity 0.8 c. The doppler shift for the light of wavelength  5500 Å is

(a) 4400 Å

(b) 1833 Å

(c) 3167 Å

(d) 7333 Å

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use

(a) 400 Ω

(b) 200 Ω

(c) 40 Ω

(d) 20 Ω

A long metal bar of 30cm length is aligned along a north south line and moves eastward at a speed of 10ms-1. A uniform magnetic field of 4.0T points vertically downwards. If the south end of the bar has a potential of 0V, the induced potential at the north end of the bar is:
Image

Assertion  :   Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then rest of the half portion become more hot.  

Reason    : Resistances decreases due to decrease in temperature and so current through wire increases.

(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.

The X-ray beam emerging from an X-ray tube:
  1. Is monochromatic.
  2. Has all wavelengths smaller than a certain maximum wavelength.
  3. Has all wavelengths greater than a certain minimum wavelength.
  4. Has all wavelengths lying between a minimum and a maximum wavelength.
Give the SI unit of magnetic dipole moment.
Consider the situation shown in figure. If the switch is closed and after some time it is opened again, the closed loop will show:
Which of the following statements related to static electricity is not true?