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Quizzes, tests, exercises and puzzles for English as a Second Language (ESL), English as a foreign language (EFL), Teaching EFL (TEFL), Test of EFL (TOEFL), English for speakers of other languages (ESOL), Teaching ESOL (TESOL), TOEIC.


1. It was an easy test ________ I failed.


2. 'Sad'and 'miserable'are ________


3. 'Wonderful'and 'terrific'are ________


4. 'Fantastic'and 'awful'are ________


5. Many _________ people have said the same.



6. He's a fair ________ unpleasant man.


7. I won't let them do that to me ________ time.


8. They gazed into each _________ eyes.


9. One person's peach is ________ person's poison.


10. I gave it to the ________ mother.


Competitive Exams

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30. ESL-EFL Test - 59
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  • Simple Science

    A Portable Barometer

    Air:
    The mercury barometer is large and inconvenient to carry from place to place, and a more portable form has been devised, known as the aneroid barometer. This form of barometer is extremely sensitive; indeed, it is so delicate that it shows the slight difference between the pressure at the table top and the pressure at the floor level, whereas the mercury barometer would indicate only a much greater variation in atmospheric pressure. The aneroid barometers are frequently made no larger than a watch and can be carried conveniently in the pocket, but they get out of order easily and must be frequently readjusted. The aneroid barometer is an air-tight box whose top is made of a thin metallic disk which bends inward or outward according to the pressure of the atmosphere. If the atmospheric pressure increases, the thin disk is pushed slightly inward; if, on the other hand, the atmospheric pressure decreases, the pressure on the metallic disk decreases and the disk is not pressed so far inward. The motion of the disk is small, and it would be impossible to calculate changes in atmospheric pressure from the motion of the disk, without some mechanical device to make the slight changes in motion perceptible.

    In order to magnify the slight changes in the position of the disk, the thin face is connected with a system of levers, or wheels, which multiplies the changes in motion and communicates them to a pointer which moves around a graduated circular face. In Figure 45 the real barometer is scarcely visible, being securely inclosed in a metal case for protection; the principle, however, can be understood by reference to Figure.

    FIG. - Aneroid barometer.

    FIG. - Principle of the aneroid barometer.


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