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
- 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
The correct answers to the above question in:
Answer: (c)
Kinetic energy is a scalar quantity it does not have a direction.
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Question : 1
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 : 2
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 : 3
The sum of the change in kinetic and potential energy is always
a) Negative
b) Positive
c) Zero
d) None of the above
Answer »Answer: (c)
Question : 4
How much time will it take to perform 440 J of work at a rate of 11 W?
a) 30 s
b) 40 s
c) 50 s
d) 20 s
Answer »Answer: (b)
Question : 5
A truck, a car and a motorcycle have equal kinetic energies. If equal, stopping forces are applied and they stop after travelling a distance of X, Y and Z respectively, then
a) X = Y = Z
b) X < Y < Z
c) X > Y > Z
d) X ≅ 4Y ≅ 8Z
Answer »Answer: (a)
Question : 6
A couple produces a
a) no motion.
b) pure rotational motion
c) pure linear motion
d) both linear and rotational motion
Answer »Answer: (b)
Two forces equal in magnitude but opposite in direction form a couple which tends to rotate the body.
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