_____ is used to measure the extent of uniform corrosion.

Corrosion of less corrosion-resistant metal is usually increased and the attack of the more corrosion-resistant is decreased in galvanic corrosion.

A

True

B

False

Consider a reinforcing bar embedded in concrete. In a marine environment this bar undergoes uniform corrosion, which leads to the deposition of corrosion products on its surface and an increase in the apparent volume of the bar. This subjects the surrounding concrete to expansive pressure. As a result, corrosion induced cracks appear at the surface of concrete. Which of the following statements is TRUE?

A

Corrosion causes circumferential tensile stresses in concrete and the cracks will be parallel to the corroded reinforcing bar.

B

Corrosion causes radial tensile stresses in concrete and the cracks will be parallel to the corroded reinforcing bar.

C

Corrosion causes circumferential tensile stresses in concrete and the cracks will be perpendicular to the direction of the corroded reinforcing bar

D

Corrosion causes radial tensile stresses in concrete and the cracks will be perpendicular to the direction of the corroded reinforcing bar

Which of the following corrosion form is considered as the intermediate stage between uniform corrosion and complete corrosion resistance?

A

Galvanic corrosion

B

Pitting corrosion

C

Intergranular corrosion

D

Erosion corrosion

A person X from a place A and another person Y from a place B set out at the same time to walk towards each other. The places are separated by a distance of 15 km. X walks with a uniform speed of 1.5 km / hr and Y walks with a uniform speed of 1 km / hr in the first hour, with a uniform speed of 1.25 km / hr in the second hour and with a uniform speed of 1.5 km / hr in the third hour and so on. Which of the following is / are correct? 1. They take 5 hours to meet. 2. They meet midway between A and B. Select the correct answer using the code given below:

A

1 only

B

2 only

C

Both 1 and 2

D

Neither 1 nor 2

_____ is/are used to measure the extent of pitting corrosion.

A

MPY

B

MDD

C

Both MPY and MDD

D

MPK

India's latitudinal and longitudinal extent measured in degrees are almost the same, but its north-south extent measured in km is greater than its east-west extent. This is due to the fact that

A

Longitudes are not parallel lines

B

The distance between latitudes remains the same but the distance between longitudes is greatest at the Equator and nil at the poles where all longitudes join

C

All longitudes with their opposites form great circles

D

The earth is not a perfect sphere

Which one of the following pairs correctly denotes latitudinal-longitudinal extent of Rajasthan? Latitudinal Extent Longitudinal Extent 1) 23°3' to 30°12' N 70°46' to 77°17' E 2) 23°3' to 30°12' N 69°30' to 78°17' E 3) 24°3' to 30°11' N 69°31' to 78°17' E 4) 23°3' to 30°11' N 70°45' to 79°17' E

A

1

B

2

C

3

D

4

Consider the following statements regarding corrosion of ceramic material: 1. Ceramic materials are much better suited to withstand most of these environments for reasonable time periods than are metals. 2. Corrosion of ceramic materials generally involves simple chemical dissolution, in contrast to the electrochemical processes found in metals. 3. Ceramic materials are not frequently used because of their non-resistance to corrosion. Which of the above statements is/are correct?

A

1 and 3 only

B

2 and 3 only

C

3 only

D

1 and 2 only

Match List I with List II : List I Type of validity List II Reflection (A) Face Validity (I) Indicates adequacy of instrument (B) Concurrent validity (II) Indicates the extent to which the measurement is used (C) Construct (III) Compares a new test to an already established test. (D) Predictive (IV) The extent to which a score on a scale forecasts scores on same criterion measure Choose the correct answer from the options given below :

A

(A) - (I), (B) - (II), (C) - (III), (D) - (IV)

B

(A) - (II), (B) - (III), (C) - (IV), (D) - (I)

C

(A) - (III), (B) - (IV), (C) - (I), (D) - (II)

D

(A) - (I), (B) - (III), (C) - (II), (D) - (IV)

Which of the following corrosion test is most reliable to know the extent of pitting corrosion?

A

To measure the average depth of pits

B

To measure the maximum depth of a pit

C

Weight loss method

D

Weight gain method

_____ is used to measure the extent of uniform corrosion.

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