iQ Quiz Game 20

Test # 20


1.
In a group of 15, 7 can speak Spanish, 8 can speak French, and 3 can speak neither. What fraction of the group can speak both French and Spanish?

Login/Register to access massive collection of FREE questions and answers.
Login/Register

iQ Quiz
Quiz Index
1450 questions in 145 tests. Each test contains 10 questions.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

Idiom of the Day

dig in
to begin eating
"Let`s dig in and eat before the food gets cold!"

My Account / Test History


Simple Science

The Electric Bell

Modern Electrical Inventions:
The ringing of the electric bell is due to the attractive power of an electromagnet. By the pushing of a button connection is made with a battery, and current flows through the wire wound on the iron spools, and further to the screw P which presses against the soft iron strip or armature S; and from S the current flows back to the battery. As soon as the current flows, the coils become magnetic and attract the soft iron armature, drawing it forward and causing the clapper to strike the bell. In this position, S no longer touches the screw P, and hence there is no complete path for the electricity, and the current ceases. But the attractive, magnetic power of the coils stops as soon as the current ceases; hence there is nothing to hold the armature down, and it flies back to its former position. In doing this, however, the armature makes contact at P through the spring, and the current flows once more; as a result the coils again become magnets, the armature is again drawn forward, and the clapper again strikes the bell. But immediately afterwards the armature springs backward and makes contact at P and the entire operation is repeated. So long as we press the button this process continues producing what sounds like a continuous jingle; in reality the clapper strikes the bell every time a current passes through the electromagnet.

FIG. - The electric bell.

Home
My Account
English Test
Verbal Reasoning
GK Quiz
Grammar Test