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) 30 s
(b) 40 s
(c) 50 s
(d) 20 s
The correct answers to the above question in:
Answer: (b)
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
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.
Question : 2
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 : 3
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 : 4
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 : 5
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.
Question : 6
Consider the following statements:
- The gravitational force exerted by the sun on the moon is greater than the gravitational force exerted by the earth on the moon.
- A heavy body falls at a faster rate than a light body in vacuum.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (b)
Thus, the gravitational force F between two bodies is directly proportional to the product of the masses of those bodies.
Here, since the product m1m2 is greater for the sun and the moon than that of the earth and the moon (because the mass of the sun is greater than that of the earth), therefore F exerted by the sun on the moon is greater than the F exerted by the earth on the moon
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