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130. The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral?

A. Cassiterite

B. Sphalerite

C. Chalcopyrite

D. Calcite

✅ The correct answer is option D.

132. Pick the odd man out.

A. Austempering

B. Martempering

C. Cyniding

D. Parkerizing

✅ The correct answer is option D.

134. Which set of materials is used as a moderator in nuclear reactor?

A. Zircalloy & berrylium

B. Zircalloy & heavy water

C. Zirconium & berrylium

D. Heavy water & berrelium

✅ The correct answer is option D.

136. Euler number is defined as the ratio of inertia force to __________ force.

A. Pressure

B. Elastic

C. Gravity

D. Viscous

✅ The correct answer is option A.

138. The ‘laughing gas’ is

A. Nitrous oxide

B. Nitric oxide

C. Nitrogen trioxide

D. Nitrogen pentoxide

✅ The correct answer is option A.

140. A solar cell converts the sunlight directly into __________ energy.

A. Thermal

B. Electrical

C. Mechanical

D. Chemical

✅ The correct answer is option B.

142. Which of the following is an unconventional source of energy ?

A. Thermal power

B. Hydroelectric power

C. Nuclear-fusion power

D. Solar power

✅ The correct answer is option D.

144. For grinding of softer materials, the grinding wheel should have __________ grain size.

A. Finer

B. Coarser

C. Medium

D. Any type of

✅ The correct answer is option B.

146. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

A. 1

B. 10

C. 30

D. 45

✅ The correct answer is option B.

148. Hardness & tensile strength of austenitic stainless steel can be increased by

A. Martempering

B. Cold working

C. Normalising

D. Hardening

✅ The correct answer is option B.

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