Step 1: Observe the given piece.
The given jigsaw piece has multiple inward and outward steps along one side, while the opposite side is straight. To form a rectangle, the missing piece must perfectly complement these indentations and protrusions.
Step 2: Identify required properties of the missing piece.
The missing piece must have an exact inverse pattern of the stepped edges of the given piece so that, after rotation or flipping, all irregular edges cancel out and the outer boundary becomes a perfect rectangle.
Step 3: Check option (A).
Option (A), when rotated and aligned with the given piece, exactly fills all the gaps created by the protrusions and indentations of the given piece. Together, they form straight outer edges on all sides, producing a rectangle.
Step 4: Eliminate other options.
Options (B), (C), and (D) do not match the step pattern correctly. Even after rotation or flipping, they either leave gaps or create overlapping protrusions, preventing the formation of a rectangular shape.
Step 5: Conclusion.
Only option (A) can combine with the given piece to form a rectangle.
Final Answer: (A)


Potato slices weighing 50 kg is dried from 60% moisture content (wet basis) to 5% moisture content (dry basis). The amount of dried potato slices obtained (in kg) is ............ (Answer in integer)
Two Carnot heat engines (E1 and E2) are operating in series as shown in the figure. Engine E1 receives heat from a reservoir at \(T_H = 1600 \, {K}\) and does work \(W_1\). Engine E2 receives heat from an intermediate reservoir at \(T\), does work \(W_2\), and rejects heat to a reservoir at \(T_L = 400 \, {K}\). Both the engines have identical thermal efficiencies. The temperature \(T\) (in K) of the intermediate reservoir is ........ (answer in integer). 
A bar of length \( L = 1 \, {m} \) is fixed at one end. Before heating its free end has a gap of \( \delta = 0.1 \, {mm} \) from a rigid wall as shown in the figure. Now the bar is heated resulting in a uniform temperature rise of \( 10^\circ {C} \). The coefficient of linear thermal expansion of the material is \( 20 \times 10^{-6} / \degree C \) and the Young’s modulus of elasticity is 100 GPa. Assume that the material properties do not change with temperature.
The magnitude of the resulting axial stress on the bar is .......... MPa (in integer). 
A massless cantilever beam, with a tip mass \( m \) of 10 kg, is modeled as an equivalent spring-mass system as shown in the figure. The beam is of length \( L = 1 \, {m} \), with a circular cross-section of diameter \( d = 20 \, {mm} \). The Young’s modulus of the beam material is 200 GPa.
The natural frequency of the spring-mass system is ............ Hz (rounded off to two decimal places).
A simply-supported beam has a circular cross-section with a diameter of 20 mm, area of 314.2 mm\(^2\), area moment of inertia of 7854 mm\(^4\), and a length \( L \) of 4 m. A point load \( P = 100 \, {N} \) acts at the center and an axial load \( Q = 20 \, {kN} \) acts through the centroidal axis as shown in the figure.
The magnitude of the offset between the neutral axis and the centroidal axis, at \( L/2 \) from the left, is ............ mm (rounded off to one decimal place).