Question:

Which of the following material is used for photoconductive cells

A.

Selenium

B.

Thorium

C.

Mica

D.

Tungsten

Answer» a. Selenium

Question:

Odometer is used to measure

A.

threshold odours of gases

B.

composition of gases

C.

distances

D.

None of the above

Answer» c. distances

Question:

The ‘dead time’ of the instrument is

A.

The time required by an instrument for initial warming up

B.

The time required by an instrument to begin to respond to a change in the measured value

C.

The largest change of input quantity for which there is no output of the instrument

D.

None of the above

Answer» b. The time required by an instrument to begin to respond to a change in the measured value

Question:

For ocean sounding where the depth of water is too much and where continuous and accurate record of the depth of water below a boat or ship is to be made, the instrument generally used is known as

A.

Tellurometer

B.

Sound meter

C.

Sound box

D.

Fathometer

Answer» b. Sound meter

Question:

The fine wire of which material is most commonly used for resistance thermometer

A.

stainless steel

B.

Aluminium

C.

Nickel

D.

None of the above

Answer» c. Nickel