Physics - Mock Test 5

Question 41

The SI base unit for mass is

A) gram B) pound C) kilogram D) ounce

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Question 42

There is no SI base unit for area because

A) an area has no thickness; hence no physical standard can be built B) we live in a three (not a two) dimensional world C) it is impossible to express square feet in terms of meters D) area can be expressed in terms of square meters

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Question 43

In 1866, the U. S. Congress defined the U. S. yard as exactly 3600/3937 international meter. This was done primarily because

A) length can be measured more accurately in meters than in yards B) the meter is more stable than the yard C) this definition relates the common U. S. length units to a more widely used system D) there are more wavelengths in a yard than in a meter

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Question 44

Which of the following is closest to a yard in length

A) 0.01 m B) 0.1 m C) 1 m D) 100 m

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Question 45

A nanosecond is

A) 10⁹ s B) 10⁻⁹ s C) 10⁻¹⁰ s D) 10⁻¹² s

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Question 46

The SI standard of time is based on

A) the daily rotation of the earth B) the frequency of light emitted by Kr⁸⁶ C) the yearly revolution of the earth about the sun D) none of these

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Question 47

The ozone hole that has been detected lies in the atmosphere above

A) Arctic Ocean B) Antarctica C) India D) Alaska

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Question 48

Name the process of production of energy in the Sun

A) Nuclear fission B) Radioactivity C) Nuclear fusion D) Ionization

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the process of production of energy in the Sun by nuclear fusion, the hydrogen gas is burned releasing an enormous amount of energy in the form of light and heat

Question 49

Amount of water vapour in the atmosphere is measured in terms of

A) Humidity B) Droplets C) Smog D) All of the above

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Question 50

For a person having hypermetropia, the near point is

A) greater than 25 cm B) greater than 50 cm C) less than 25 cm D) infinity

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