Question

1. The second largest percentage of atoms in Universe comprises
A. hydrogen
B. helium
C. carbon
D. oxygen

2. The following quark has negative properties
A. up
B. strange
C. charm
D. truth

3. Two down quarks and one truth quark would have a net charge of
A. +2/3
B. +1
C. -1/3
D. 0

4. All of the following are leptons EXCEPT
A. electron
B. muon
C. tau
D. proton

5. The temperature of the surface of Sol is approximately
A. 450,000 degrees C
B. 10,000 degrees C
C. 4,500 degrees C
D. 1,000 degrees C

Answer 1

1. ans ) Helium almost 25%

hydrogen - in correct - it is the largest

carbon - incorrect- fourth most abundant

oxygen - incorrect- third most abundant

2.ans ) strange - correct (strange,down , and bottom have negative 1/3 charge )

( up, charm, truth have positive quark have 2/3 charge )

3.ans ) 0 is correct ----> ((-1/3) + (-1/3) + ( 2/3) = 0

4) ans ) protons - they have positive charge

electrons , muon, and Tau -incorrect - they are leptones means they have negative charge ,their nutrinos have neutral charge.