1
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) The upper surface of the wing of an aeroplane is made convex and the lower surface is made concave.

Reason (R) The air currents at the top have smaller velocity and thus less pressure at the bottom than at the top.

A
Both $$A$$ and $$R$$ are true and $$R$$ is a correct explanation for $$A$$.
B
Both $$A$$ and $$R$$ are true but $$R$$ is not a correct explanation for $$A$$.
C
$$A$$ is true, $$R$$ is false.
D
$$A$$ is false, $$R$$ is true.
2
AP EAPCET 2021 - 20th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

A glass flask weighting 390 g, having internal volume 500 cc just floats when half of it is filled with water. Specific gravity of the glass is

A
2.8
B
1.8
C
1.0
D
2.5
3
AP EAPCET 2021 - 20th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

Water does not wet an oily glass because

A
cohesive force of oil is greater than adhesive force between oil and glass
B
cohesive force of oil is greater than cohesive force of water
C
oil repels water
D
cohesive force of water is greater than adhesive force between water and oil molecules
4
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the incorrect statement regarding Reynold's number $$\left(R_e\right)$$.

A
For $$R_e < 1000$$, flow is laminar.
B
For $$1000 < R_e < 2000$$, flow is steady.
C
For $$R_e > 2000$$, flow is turbulent.
D
$$R_e$$ is a dimensionless number.

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