set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on physical properties of materials topic of general science mcq
(a) 3
(b) 2
(c) 4
(d) 1
The correct answers to the above question in:
Answer: (b)
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Question : 1
Water is flowing through a horizontal pipe line having a restriction. Then
a) pressure will be greater at the restriction.
b) pressure will be the same throughout the length of the pipe.
c) pressure will be greater in the wider portion.
d) None of these
Answer »Answer: (c)
A ↑ v ↑ P ↑
(Area A, Velocity v, Pressure P)
Question : 2
A and B are two wires. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is
a) four times that on A
b) equal to that on A
c) two times that on A
d) half that on A
Answer »Answer: (a)
$Stress = \text"force"/\text"Area" ∴ Stress ∝ 1/{πr^2}$
$S_B/S_A = (r_A/r_B)^2 = (2)^2 ⇒ S_B = 4S_A$
Question : 3
The lift of an air plane is based on
a) bernoulli’s theorem
b) Torricelli’s theorem
c) law of gravitation
d) conservation of linear momentum
Answer »Answer: (a)
Apply Bernoulli’s theorem.)
Question : 4
In cold weather, aquatic animals survive even when water at the top layer of the lake freezes into ice because
a) They have enough of accumulated oxygen inside them
b) Their body structure is such that they can survive without oxygen
c) They can breathe in ice
d) Water has the highest density at 4°C so underneath the top layer of ice there is a layer of water
Answer »Answer: (d)
Question : 5
Two pieces of metal when immersed in a liquid have equal upthrust on them; then
a) both pieces must have equal densities
b) both pieces must have equal weights
c) both pieces must have equal volumes
d) both are floating to the same depth
Answer »Answer: (c)
Question : 6
The rain drops are spherical because
a) The air has resistance
b) The water has surface tension
c) They fall from big height
d) None of the above
Answer »Answer: (b)
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