set 2 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) Car C is faster than car D.
(b) Car B is the slowest.
(c) Car A is faster than car D
(d) Car C is the lowest.
The correct answers to the above question in:
Answer: (b,c)
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 2) Online Quiz
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Question : 1
Which one of the following is a vector quantity?
a) Energy
b) Pressure
c) Momentum
d) Work
Answer »Answer: (c)
Question : 2
The relative velocity vAB or vBA of two bodies A and B may be
- greater than the velocity of body A
- greater than the velocity of body B
- less than the velocity of body A
- less than the velocity of body B
a) (1), (2) and (3) only
b) (3) and (4) only
c) (1) and (2) only
d) (1), (2), (3) and (4).
Answer »Answer: (d)
All options are correct :
(i) When two bodies A & B move in opposite directions then the relative velocity between A & B either vAB or vBA both are greater than vA & vB .
(ii) When two bodies A & B move in parallel direction then
vAB = vA – vB ⇒ vAB < vA
vBA = vB – vA ⇒ vBA < vB
Question : 3
A balloon filled with CO2 released on earth would (neglect viscosity of air)
a) fall with a constant acceleration 3.4 m/s2
b) fall with an acceleration 9.8 m/s2
c) climb with an acceleration 9.8 m/s2
d) fall with acceleration and then would attain a constant velocity
Answer »Answer: (a)
If B is upthrust of air on balloon, and a is downward acceleration, then
Mg – B = Ma
⇒ a = ${Mg - B}/M = g- {{Vρ}_{air}g}/{{Vρ}_{CO_2}}$
=$(1-{{Vρ}_{air}}/{{Vρ}_{CO_2}})g = (1-{28.8}/{44})×9.8m/{s}^2$
=3.4m/${s}^2$
Question : 4
Two bodies A and B have masses M and m respectively where M > m and they are at a distance d apart. Equal force is applied to them so that they approach each other. The position where they hit each other is
a) at equal distance from A and B
b) nearer to A
c) nearer to B
d) cannot be determined
Answer »Answer: (b)
As net external force on the system is zero therefore position of their centre of mass remains unaffected i.e. they will hit each other at the point of centre of mass. The centre of mass of the system lies nearer to A because MA > MB .
Question : 5
If an object having mass of 1 kg is subjected to a force of 1 N it moves with
a) an acceleration of 10 m/s2
b) a speed of 1 km/s
c) a speed of 1 m/s
d) an acceleration of 1 m/s2
Answer »Answer: (d)
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