Question # 1

Most harmful of biosphere is

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Deforestation

Nuclear fail out

Salinity

Water logging

Which sequence of step is correct for the manufacture of cement:

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Crushing, mixing, heating, grinding

Crushing, heating, mixing, grinding

Crushing, grinding, mixing, heating

Mixing, heating, grinding, crushing

According to the general gas equation, density of an ideal gas depends upon

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Pressure

Temperature

Molar mass of the gas

All of the above

The elements like N,P,K added into the large amount in soil are called:

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Basic elements

Additives

Macronutrients

Micronutrients

The beaker contains slurry of ice and water, the three thermometers Fahrenheit, Kelvin and centigrade placed init. the thermometers are represented as A, B and C respectively, On which thermometer the lowest reading will be?

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B

A

C

both A and B

Which state about gases is not correct?

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They spread throughout the vessel.

Pressure is due to collision.

There are larger spaces between the molecules.

Molecules are arranged regularly.

All the following statements are incorrect except:

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all of the gases cannot be liquefied

increase of pressure will not decrease the inter molecular distance in a gas

gas molecules do not attract each other at very low temperature

actual volume of a gas is not negligible at very pressure

Forms of waste products:

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Heat

Smoke

Solid

All of these

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

Which fiber contains 85% acrylonitrile by weght?

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azlon fiber

saran fiber

acrylic fiber

rayon fiber

Elements of group IV-A are

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neither strongly electropositive nor strongly electronegative

strongly electropositive

strongly electronegative

none of these

Aqueous solution of glucose C₆H₁₂O₆, boils at 100.052°C. The solution contains

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180 grams glucose in 1 kg water

18 grams glucose in 1 kg water

1.8 grams glucose in 1 kg water

3.6 grams glucose in 1 kg

10% aqueous solution of NaCI has molarity

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1.7 M

2.7 M

0.17 M

3.7 M

In the atmosphere, O₂is about

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10%

15%

21%

25%

For a given process the heat change at constant pressure q_pis related to the heat change at constant volume (q_v) according to

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q_p= q_v

q_p< q_v

q_p> q_v

q_p= qv/2

Which one of the following reaction takes place spontaneously

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Which of the following has highest dipole moment?

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NH₃

PH₃

AsH₃

SbH₃

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

The radius of second Bohr's orbit is

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0.053 nm

0.053/4 nm

0.053 x 4 nm

0.053 x 20 nm

Which of the following is not present in nucleotide?

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Guanine

Cytosine

Adenine

Tryoxine

The C-C bond angles in benzene ring are

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119°

120°

121°

None

Acid rains are produced by

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Excess NO₂and SO₂from burining fossil fuels

Excess production of NH₃by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂by combustion and animal respiration

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