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Question: Material having negative co-efficient of linear expansion is
[A].

copper

[B].

aluminium

[C].

rubber

[D].

nickel

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ is a special constituent of chlorophyll without which photosynthesis is not possible.
[A].

Calcium

[B].

Nitrogen

[C].

Phosphorous

[D].

Hydrogen

Answer: Option B

Explanation:

No answer description available for this question.

Question: If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ?
[A].

7

[B].

< 7

[C].

> 7

[D].

0

Answer: Option C

Explanation:

No answer description available for this question.

Question: Melting point & boiling points of liquid oxygen are respectively – 218.8°C & – 183°C, while the same for liquid nitrogen is – 210°C & – 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8
[A].

°C

[B].

°F

[C].

°K

[D].

°R

Answer: Option B

Explanation:

No answer description available for this question.

Question: Which of the following represents the correct time-temperature curve when a block of metal is heated above room temperature & then left to cool in the room following Newton’s law of cooling in which the rate of temperature drop will go on decreasing with the passage of time.
[A].

[B].

[C].

[D].

Answer: Option C

Explanation:

No answer description available for this question.

Question: Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.
[A].

enthalpy

[B].

relative humidity

[C].

wet bulb temperature

[D].

dew point temperature

Answer: Option D

Explanation:

No answer description available for this question.

Question: Broaching tools are usually made of
[A].

cermets

[B].

high speed steel

[C].

tungsten carbide

[D].

stellite

Answer: Option B

Explanation:

No answer description available for this question.

Question: Dew point of air indicates its
[A].

moisture content

[B].

dryness

[C].

latent heat

[D].

coolness

Answer: Option A

Explanation:

No answer description available for this question.

Question: Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C.
[A].

-30.5

[B].

-78.5

[C].

-183.5

[D].

-10.5

Answer: Option B

Explanation:

No answer description available for this question.

Question: Ammonia leakage in the refrigeration system is detected by
[A].

sulphur stick, which on detection gives white smoke.

[B].

using chemical reagents.

[C].

its smell.

[D].

soap solution.

Answer: Option A

Explanation:

No answer description available for this question.