set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 5 EXERCISES
The following question based on mechanics (mass, force, acceleration, work, energy, momentum, velocity) topic of general science mcq
(a) Negative
(b) Positive
(c) Zero
(d) None of the above
The correct answers to the above question in:
Answer: (c)
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 3) Online Quiz
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Read more mechanics work and energy Based General Science Questions and Answers
Question : 1
The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?
a) length = 200 cm, diameter = 2 mm
b) length = 50 cm, diameter = 0.5 mm
c) length = 100 cm, diameter = 1 mm
d) length = 300 cm, diameter = 3 mm
Answer »Answer: (b)
Y=$\text"T/A"/\text"Δl/l"$
$Δl={T×l}/{A×Y}=T/Y×l/A$
Hence, $T/Y$ is constant. Therefore, $Δl = l/A$
$l/A$ is the largest in the first case.
Question : 2
As the train starts moving, the head of the passenger sitting inside leans backward because of
a) Moment of Inertia
b) Inertia of Motion
c) Inertia of Rest
d) Conservation of Mass
Answer »Answer: (c)
Question : 3
Consider the following two statements:
- Linear momentum of a system of particles is zero.
- Kinetic energy of a system of particles is zero.
a) 1 implies 2 and 2 implies 1.
b) 1 implies 2 but 2 does not imply 1.
c) 1 does not imply 2 but 2 implies 1.
d) 1 does not imply 2 and 2 does not imply 1.
Answer »Answer: (c)
If $L↖{→}$ = 0 ⇒ K. E may or may not be zero.
If K.E = 0, $L↖{→}$ = 0
Question : 4
A monkey is climbing up a rope, then the tension in the rope
a) must be greater than the force applied by the monkey on the rope.
b) must be less than the force applied by the monkey on the rope.
c) must be equal to the force applied by the monkey on the rope.
d) may be equal to, less than or greater the force applied by the monkey on the rope.
Answer »Answer: (c)
Question : 5
The centre of mass of triangle shown in figure has coordinates
a) $x = b/3, y = h/3$
b) $x = b/2, y = h/2$
c) $x = h/2, y = b/2$
d) $x = h/3, y = b/3$
Answer »Answer: (a)
We can assume that three particles of equal mass m are placed at the corners of triangle${r_1}↖{→} = Oi↖{˄} + Oj↖{˄},{r_2}↖{→} = bi↖{˄} + Oj↖{˄} and {r_3}↖{→} = Oi↖{˄} + hj↖{˄}$∴ $r_{cm}↖{→}={m_1{r_1}↖{→}+m_2{r_2}↖{→}+m_3{r_3}↖{→}}/{m_1+m_2+m_3}=b/3{i}↖{˄}+h/3{j}↖{˄}$i.e. coordinates of centre of mass is $(b/3, h/3)$
Question : 6
Regarding mechanical energy, which of the following statements is/are correct?
- Kinetic energy of a body depends upon the direction of motion.
- When a body falls freely, its P.E. is converted into K.E.
- A body at rest may possess P.E.
a) 2 only
b) 1 and 2
c) 2 and 3
d) 3 only
Answer »Answer: (c)
Kinetic energy is a scalar quantity it does not have a direction.
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