1
MHT CET 2023 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A simple spring has length $$l$$ and force constant $$K$$. It is cut in to two springs of length $$l_1$$ and $$l_2$$ such that $$l_1=n l_2$$($$n$$ is an integer). The force constant of spring of length $$l_1$$ is

A
$$K(1+n)$$
B
$$\frac{K(n+1)}{n}$$
C
$$K$$
D
$$\frac{K}{(n+1)}$$
2
MHT CET 2023 9th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The side of a copper cube is $$1 \mathrm{~m}$$ at $$0^{\circ} \mathrm{C}$$. What will be the change in its volume, when it is heated to $$100^{\circ} \mathrm{C}$$ ? $$\left[\alpha_{\text {copper }}=18 \times 10^{-6} /{ }^{\circ} \mathrm{C}\right]$$

A
$$45 \times 10^{-4} \mathrm{~m}^3$$
B
$$54 \times 10^{-4} \mathrm{~m}^3$$
C
$$34 \times 10^{-4} \mathrm{~m}^3$$
D
$$64 \times 10^{-4} \mathrm{~m}^3$$
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