2022 · Paper 1

Complete GATE MT 2022 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 43–45 of 65. Imported answers require review unless explicitly marked reviewed.

Question 43

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Which of the following statement(s) is(are) TRUE about black body radiation?

Your answerSelect all correct options. You can choose more than one.

A.

Among all radiation emitted by an ideal black body at room temperature, the most intense radiation falls in the visible light spectrum

B.

The total emissive power of an ideal black body is proportional to the square of its absolute temperature

C.

The emissive power of an ideal black body peaks at a wavelength



which is inversely proportional to its absolute temperature

D.

The radiant energy emitted by an ideal black body is greater than that emitted by the non-black body at all temperatures above 0 K

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Question 44

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Which of the following parameter(s) influence(s) the melting rate of the consumable wire in a gas metal arc welding process?

Your answerSelect all correct options. You can choose more than one.

A.

Stick-out length

B.

Weld speed

C.

Welding current

D.

Diameter of the consumable wire

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Question 45

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A non-rotating smooth solid spherical object is fixed in the stream of an inviscid incompressible fluid of density



(see figure). The flow is horizontal, slow, steady, and fully developed far from the object as shown by the stream arrows near point O. Which of the following statement(s) is(are) TRUE?

(Note: B is the center of the sphere and the straight horizontal line OAB intersects the surface of the sphere at the point A.)



Your answerSelect all correct options. You can choose more than one.

A.

The velocity of the fluid at the point A is zero

B.

The fluid pressure at the point A exceeds that at point O by the amount



, where



is the fluid velocity at point O

C.

Fluid moving precisely along OA will turn perpendicular to OA to circumvent the object

D.

On each side of the central streamline OA, the flow will be deflected round the object

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