Which one of the following radioactive radiation consists of high-energy rays?
Anonymous Quiz
16%
Alpha rays
6%
Beta rays
76%
Gamma rays
2%
Beta particles
The metal thallium occurs naturally as 30% thallium-203 and 70% thallium-205. What is the average atomic mass of thallium?
Anonymous Quiz
9%
204.8 a.m.u
36%
204.7 a.m.u
46%
204.4 a.m.u
9%
204.3 a.m.u
The number of neutrons in the nucleus of an iron atom is: (A = 56, Z = 26)
Anonymous Quiz
14%
82
6%
56
70%
30
10%
26
❤4
In Niels Bohr's model of the atom, electrons are said to occupy specific energy levels or orbits around the nucleus. What is the primary feature of these orbits?
Anonymous Quiz
28%
Electrons can exist anywhere around the nucleus.
59%
Electrons can only occupy certain allowed energy levels.
9%
Electrons are stationary and do not move.
4%
Electrons can only be found in the nucleus.
What is the electron configuration for magnesium(Mg) metal? Z = 12
Anonymous Quiz
4%
1s²2s²2p⁶3s¹
77%
1s²2s²2p⁶3s²
4%
1s²2s²2p⁵3s¹
15%
1s²2s²2p⁶3s²
❤5
What is the core electron configuration of calcium (Ca) metal? Z = 20.
Anonymous Quiz
15%
[Ne]4s²
72%
[Ar]4s²
7%
[Ar] 4s¹
7%
[Ar] 4s² 3d¹
❤3
[Biol 12] Evolution (2003-2011) Answers (1).pdf
205.9 KB
[Biol 12] Evolution (2003-2011) Answers (1)
Physics_G_12_100_Questions_and_Answers_from_Unit_4_Electromagnetism.pdf
10.3 MB
Physics G-12 100 Questions and Answers from Unit 4 Electromagnetism
❤3
When a body exerts a force on a second body, the second body exerts a force on the frist body which is equal in magnitude but opposite in direction. This law is known as _______________?
Anonymous Quiz
5%
Newton's 1st law
13%
Newton's 2nd law
80%
Newton's 3rd law
2%
Not exist in any law
If 140 cm³ of CH4 diffuse into air in 72 seconds, how long will it take 210 cm³ of SO2 to diffuse under the same conditions?
Anonymous Quiz
18%
72 seconds
54%
144 seconds
20%
60 seconds
8%
156 seconds
🥰1
What volume of oxygen will react with carbon monoxide to produce 20L of carbon dioxide at STP?
Anonymous Quiz
26%
100L
26%
10ML
44%
10L
5%
100ML
❤2
Which particle among the following has the highest charge to mass ratio?
Anonymous Quiz
12%
Neutron
12%
Nucleus
46%
Electron
31%
Proton
Which of the following statement is incorrect about vectors?
Anonymous Quiz
13%
They have both magnitude and direction.
5%
Arrows are used to represent vectors.
69%
All fundamental physical quantities are vectors.
13%
The length of the arrow can tell us the magnitude of the vector.
❤2
A force of 500N is acting on a body upward. What is the resultant of the force?
Anonymous Quiz
19%
0 N
50%
500 N
30%
-500 N
2%
250 N
What is the angle between the two vectors A = 3i - j and B = i - 2j?
Anonymous Quiz
11%
60°
20%
57°
28%
90°
41%
45°
How will two vectors give a maximum resultant?
Anonymous Quiz
57%
When they act in the same direction.
15%
When they act in opposite direction.
26%
When they are perpendicular to each other.
2%
Can not be determined.