ECAT Pre Computer Science Chapter 20 MCQ Test With Answer

Top Scorers Of ECAT Physics Chapter 20 Atomic Spectra MCQ`s Test

Sr.#	Question	Answer
1	Graph of Black body radiation is example of	A. Band spectra B. Continuo's spectra C. Line spectra D. All
2	Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is	A. Less than atmospheric pressure B. Much less than atmospheric pressure C. Greater than atmospheric pressure D. Much greater than atmospheric pressure
3	In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them	A. Small B. Greater C. Equal D. Sometimes
4	The holes created in the L and M shells are occupied by transitions of:	A. Electrons from lower states B. Electrons from higher state C. Positrons from higher states D. Electrons from K shell
5	By CAT scans, we can detect the density difference of the order of:	A. 1% B. 20% C. 30% D. 50%
6	We can excite an atom by	A. Bombardment of particles B. Radiating photons C. Providing potential difference D. All answer are true
7	X-ray are also known as	A. Roentgen rays B. Maxwell rays C. Plank range D. Einstein rays
8	Coulomb multiplied by volt by volt gives the unit called:	A. farad B. Ohm C. Second D. joule
9	The range of wavelengths of colurs in the visible colours is	A. 140 nm to 456 nm B. 10 nm to 56 nm C. 410 nm to 656 nm D. 910 nm to 956 nm
10	The shell closer to the nucleus is called:	A. N shell B. L shell C. K shell D. M shell