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Mechanics and Properties of Matter

19. 

The densities of three liquids are D,2D and 3D. What will be the density of the resulting mixture if equal volume of the three liquids are mixed?

A. D B. 14 D C. 2D D. 3D

Answer : C. 2D

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20. 

The fundamental states of matters are

A. 3 B. 4 C. 5 D. 7

Answer : B. 4 [States of matter are solids, liquids, gasses, and plasma. Under extreme conditions, other states exist, such as Bose–Einstein condensates and neutron-degenerate matter and much more exist.]

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21. 

Water in a lake and nearby wells seeks the same level because of

A. anomalous expansion of water B. surface tension of water C. force of gravity D. the same atmospheric pressure

Answer : D. the same atmospheric pressure

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22. 

when the pressure increases, the boiling point rises. The device which uses this principle is

A. Pressure cooker B. electric iron C. electric heater D. manometer

Answer : A. Pressure cooker

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23. 

In an electronic watch, the component corresponding to pendulum of a pendulum clock is a

A. Transistor B. Crystal oscillator C. Diode D. Balance wheel

Answer : B. Crystal oscillator

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24. 

A boat moves forward when water is pushed back. The basic physical law applicable here is

A. Law of floatation B. Pascal's law C. Newton's second law of motion D. Newton's third law of motion

Answer : D. Newton's third law of motion

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