1
AP EAPCET 2021 - 19th August Morning Shift
+1
-0

If two rods of length $$L$$ and $$2 L$$, having coefficients of linear expansion $$\alpha$$ and $$2 \alpha$$ respectively are connected end-to-end, then find the average coefficient of linear expansion of the composite rod.

A
$$\frac{3 \alpha}{2}$$
B
$$\frac{5 \alpha}{2}$$
C
$$\frac{5 \alpha}{4}$$
D
$$\frac{5 \alpha}{3}$$
2
AP EAPCET 2021 - 19th August Morning Shift
+1
-0

A system is taken from state-A to state-B along two different paths. The heat absorbed and work done by the system along these two paths are Q$$_1$$, Q$$_2$$ and W$$_1$$, W$$_2$$ respectively, then

A
$$Q_1=Q_2$$
B
$$W_1=W_2$$
C
$$Q_1-W_1=Q_2-W_2$$
D
$$Q_1+W_1=Q_2+W_2$$
3
AP EAPCET 2021 - 19th August Morning Shift
+1
-0

A gas ($$\gamma$$ = 1.5 ) is suddenly compressed to (1/4 )th its initial volume. Then, find the ratio of its final to initial pressure.

A
1 : 16
B
1 : 8
C
1 : 4
D
8 : 1
4
AP EAPCET 2021 - 19th August Morning Shift
+1
-0

A cylinder has a piston at temperature of $$30 \Upsilon$$C. There is all round clearance of $$0.08 \mathrm{~mm}$$ between the piston and cylinder wall if internal diameter of the cylinder is $$15 \mathrm{~cm}$$. What is the temperature at which piston will fit into the cylinder exactly?

$$\left(\alpha_p=1.6 \times 10^{-5} / \Upsilon\mathrm{C} \text { and } \alpha_c=1.2 \times 10^{-5} / \Upsilon\mathrm{C}\right)$$

A
298$$\Upsilon\mathrm{C}$$
B
273$$\Upsilon\mathrm{C}$$
C
305$$\Upsilon\mathrm{C}$$
D
268$$\Upsilon\mathrm{C}$$
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