Water boils ___ you heat it to 100 degree c.

Water boils ___ you heat it to 100°C C.

A

unless

B

duntil

C

if

D

although

Water boils------ you heat it to 100 degree Centigrade.

A

Unless

B

untill

C

if

D

although

Water boils-----you heat it to 100 Degree Celsius.

A

unless

B

if

C

until

D

although

There are blank spaces in the following passage which have been numbered . These numbers are printed below the passage and against each some words are suggested . Find out the word that best fit the blank spaces. Global Strategies to control infective disease have historically included the erection of barriers to international travel and ___ (24) _______. Keeping people with such deadly disease outside national borders has ___ (25) _______ as an important public health policy in the human immunodeficiency virus (HIV) epidemic . Betwwn 29 and 50 countries ___ (26) _____ to have introduced border restrictions on HIV _ positive foreigners ,usually those planning an ___ (27) ___ stay in the country , such as students , workers or seamen.

A

migration

B

immigrate

C

emigration

D

immigration

Water boils --- you heat it to 100 centigrade.

A

unless

B

until

C

if

D

although

Water boils _______ 100 degree Celsius.

A

by

B

with

C

in

D

at

The temperature at which water boils depends mainly on:

A

Air temperature

B

Relative humidity

C

Air pressure

D

Air density

E

The specific heat of air

Water always boils when its

A

Temperature reaches 100° C

B

Vapour pressure equals 76 cm of Hg

C

Saturated vapour pressure equals the external pressure on its surface

D

Saturated vapour pressure is less than the atmospheric pressure

The temperature at which water boils depends mainly on

A

Air Pressure

B

Specific heat

C

Density

D

Relative humidity

When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of

A

air

B

hydrogen

C

hydrogen and oxygen

D

water vapour

Water boils ___ you heat it to 100 degree c.

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