ASVAB 試験問題を無料オンラインアクセス

The transistor, a small, solid-state device that can amplify sound, was invented in 1947. At first, it was too expensive and too difficult to produce to be used in cheap, mass-market products. By 1954, though, these cost and production problems had been overcome, and the first transistor radio was put on the market.
According to this passage:

• A.Transistors were invented in 1947 by order of the Department of Defense.
• B.When transistors could be produced cheaply and easily, the transistor radio was put on the market.
• C.There was no market for transistors before 1954.
• D.Transistors are still expensive to produce.

Force is something that can change the velocity of an object by making it

• A.slow down.
• B.speedup.
• C.all of the above.
• D.start or stop.

Darla spent $120.37 on groceries in January, $108.45 in February, and $114.86 in March. What was the average monthly cost of Darla's groceries?

• A.$114.56
• B.$110.45
• C.$114.86
• D.$343.68

If Gear A turns left in the figure above, Gear B:

• A.It can't be determined.
• B.won't turn
• C.turns right
• D.turns left

Radio waves travel:

• A.faster than the speed of sound but slower than the speed of light
• B.at the speed of light
• C.at the speed of sound
• D.faster than the speed of light