1
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the ratio of lengths, radii and Young's Moduli of steel and brass wires in the figure are $$\mathrm{a}, \mathrm{b}$$ and $$\mathrm{c}$$ respectively, then the corresponding ratio of increase in their lengths would be

A
$$\frac{a}{3 b^2 c}$$
B
$$\frac{3 a}{2 b^2 c}$$
C
$$\frac{2 a}{3 b^2 c}$$
D
$$\frac{2 \mathrm{ab}^2}{c}$$
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two wire of same material having radius in ratio 2 : 1 and lengths in ratio 1: 2. If same force is applied on them, then ratio of their change in length will be

A
$$1: 1$$
B
$$1: 2$$
C
$$1: 4$$
D
$$1: 8$$
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two wires are made of the same material and have the same volume. The first wire has cross-sectional area $$A$$ and the second wire has cross-sectional area $$3 A$$. If the length of the first wire is increased by $$\Delta l$$ on applying a force $$F$$, how much force is needed to stretch the second wire by the same amount?

A
4F
B
6F
C
9F
D
F
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A man grows into a giant such that his height increases to 8 times his original height. Assuming that his density remains same, the stress in the leg will change by a factor of

A
$$2 \sqrt{2}$$
B
4
C
16
D
8
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