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4

Rust is

A. A mixture of FeO and Fe(OH)2

B. A mixture of Fe2O3 and Fe(OH)2

C. A mixture of Fe2O3, 3H2O and FeO

D. FeO only

Correct Answer :

C. A mixture of Fe2O3, 3H2O and FeO


Related Questions

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4

Pollination by birds is called

A. autogamy

B. entomophily

C. anemophily

D. ornithophily

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4

The metal that is present in Photo Films is

A. Silver

B. Magnesium

C. Platinium

D. Mercury

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4

Water has maximum density at

A. 0°C

B. -4°C

C. 100°C

D. 4°C

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4

Bromine is

A. A Black solid

B. A red liquid

C. A highly inflammable gas

D. colourless gas insoluble in water

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4

Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?

A. A piece of iron that is not a permanent magnet

B. The north pole of another permanent magnet

C. A positively charged glass rod

D. A negatively charged rubber rod

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4

The type of glass used in making prisms and lenses is

A. Pyrex glass

B. Soft glass

C. Flint glass

D. Jena glass

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4

Which of the following is commonly called a polyamide ?

A. Orion

B. Terylene

C. Rayon

D. Nylon

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4

Which of the following is in liquid form at room temperature ?

A. Sodium

B. Cerium

C. Francium

D. Lithium

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4

The speed of light with the rise in the temperature of the medium

A. Increases

B. Remains unaltered

C. Drops sharply

D. Decreases

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4

What is the unit for measuring the pitch or frequency of sound ?

A. Coulomb

B. Hum

C. Cycles

D. Decible

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4

The fastest-running terrestrial animal is

A. lion

B. man

C. jaguar

D. cheetah

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4

The hardest substance available on earth is

A. Platinum

B. Quartz

C. gold

D. Diamond

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4

Rust is

A. A mixture of FeO and Fe(OH)2

B. A mixture of Fe2O3 and Fe(OH)2

C. A mixture of Fe2O3, 3H2O and FeO

D. FeO only

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4

Liquefied Petroleum gas (LPG) consists of mainly

A. Methane, Butane and Propane

B. Methane, Ethane and Hexane

C. Ethane, Hexane and Nonane

D. Methane, Hexane and Nonane

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4

Cell membrane is

A. permeable

B. semipermeable

C. selectively permeable

D. impermeable

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4

In an atomic nucleus, neutrons and protons are held together by

A. Magnetic forces

B. Gravitational forces

C. Coulombic forces

D. Exchange forces

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Nitrification means

A. Conversion of nitrogen to nitric acid.

B. Production of nitrogen from air

C. Convert the atmospheric nitrogen to effective nitrogen compound.

D. Liquifaction of nitrogen

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4

The location and energy of an electron in an atom can be specified by

A. Atomic number

B. Atomic mass

C. Quantum numbers

D. None of these

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The chemial name of Uria is

A. Carbamide

B. Chloroetane

C. Aneurin

D. None of these

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4

The solar eclipse occurs when

A. the sun comes in between the moon and the earth

B. the moon comes in between the sun and the earth

C. the earth comes in the between the sun and the moon

D. None of the above

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When a gas is turned into a liquid, the process is called

A. evaporation

B. condensation

C. sublimation

D. deposition

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4

The recent atomic weight scale is based on

A. 1H1

B. 1H2

C. 6C12

D. 8O16

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4

The formula of Plaster of Paris is

A. 2CaSO4, H2O

B. CaSO4

C. CaSO4, 2H2O

D. 2CaSO4, 4H2O

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4

The metallic constituents of hard water are

A. Calcium, magnesium and iron

B. Magnesium, Calcium and tin

C. Magnesium, tin and iron

D. Iron, tin and calcium

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4

Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere in future?

A. Atomic warfare

B. Depletion of earth's ozone layer

C. CO2 from fossil fuels

D. Dust clouds from valcanoes

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4

Which of the following elements is obtained from sea weeds ?

A. Argon

B. Vanadium

C. Iodine

D. Sulphur

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4

The element present in the largest amount in rocks and minerals is

A. Carbon

B. Hydrogen

C. Aluminium

D. Silicon

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Which of the following elements is non-radioactive?

A. Uranium

B. Plutonium

C. Thorium

D. Zirconium

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4

The smallest functional and structural unit of kidney is called as

A. Granulocyte

B. Neuron

C. Reticulocyte

D. Nephron

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Lightening cause rainfall because

A. It activate H2O molecule

B. Photo-electricity reaction starts

C. Some of the gas molecules become bigger

D. It cause combination of oxygen and nitrogen