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4

The recent atomic weight scale is based on

A. 1H1

B. 1H2

C. 6C12

D. 8O16

Correct Answer :

C. 6C12


Related Questions

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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

The metal that is present in Photo Films is

A. Silver

B. Magnesium

C. Platinium

D. Mercury

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4

The fastest acting enzyme in the biological kingdom is

A. amylase

B. lipase

C. carboxypeptidase

D. carbonic anhydrase

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4

Cell membrane is

A. permeable

B. semipermeable

C. selectively permeable

D. impermeable

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4

Quartz crystals normally used in quartz clocks etc. is chemically

A. A mixture of B and C

B. Silicon dioxide

C. Germenium dioxide

D. Sodium Silicate

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4

Brass gets discoloured in air due to the presence of which gas in air

A. Carbon dioxide

B. Hydrogen Sulphide

C. Oxygen

D. Nitrogen

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4

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 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

Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of

A. Sulphonates

B. Zeolites

C. Nitrates

D. None of these

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4

In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If both inputs are positive the output is zero. This is

A. an AND circuit

B. an OR circuit

C. a high-pass filter

D. a NOR circuit

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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

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

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4

Which of the following is the lightest metal ?

A. Mercury

B. Lithium

C. Lead

D. Silver

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4

Glass is made from the mixture of

A. Quartz and mica

B. Sand and salt

C. Sand and silicates

D. None of these

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4

According to Daltons atomic theory the smallest particle which can exist independently is

A. An atom

B. A cation

C. A molecule

D. An anion

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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

The smallest functional and structural unit of kidney is called as

A. Granulocyte

B. Neuron

C. Reticulocyte

D. Nephron

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4

The intencity of Earthquakes is measured on

A. Beaufort scale

B. Secant scale

C. Mercalli scale

D. Richter scale

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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

Which of the following parts of the sun is easily visible only during a total solar eclipse?

A. core

B. photosphere

C. sunspots

D. corona

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4

The accumulation of stress along the boundaries of lithospheric plates results in which of the following?

A. Earthquakes

B. Magnetic reversals

C. Hurricanses

D. Increased deposition of deep-sea sediments

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4

The property of a substance to absorb moisture from the air on exposure is called

A. Desiccation

B. Efflorescence

C. Deliquescene

D. Osmosis

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4

The most important ore of Aluminium is

A. Calamine

B. Calcite

C. Galena

D. Bauxite

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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 major ingredient of leather is

A. Nucleic acid

B. Carbohydrate

C. Collagen

D. Polymer

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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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4

Water has maximum density at

A. 0°C

B. -4°C

C. 100°C

D. 4°C

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4

Which of the following elements is a metal

A. S

B. Ga

C. Se

D. I

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4

The oxide of Nitrogen used in medicine as anaesthetic is

A. Nitric oxide

B. Nitrogen dioxide

C. Nitrogen pentoxide

D. Nitrous oxide

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4

Permanent hardness of water can be removed by adding

A. Potassium Permanganate

B. Bleaching Powder

C. Chlorine

D. Washing Soda