set 1 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) m2
(b) m1
(c) m0
(d) m3
The correct answers to the above question in:
Answer: (c)
$V_{esc}= √{2gR}$, where R is radius of the planet.
Hence escape velocity is independent of m.
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 1) Online Quiz
Discuss Form
Read more mechanics work and energy Based General Science Questions and Answers
Question : 1
A person swims in a river aiming to reach exactly on the opposite point on the bank of a river. His speed of swimming is 0.5 m/s at an angle of 120º with the direction of flow of water. The speed of water is
a) 0.25 m/s
b) 0.5 m/s
c) 1.0 m/s
d) 0.43 m/s
Answer »Answer: (a)
Here v = 0.5 m/sec. u = ?So, sinϴ = $u/v ⇒ u/0.5 =1/2 (or) u = 0.25 ms^{-1}$
Question : 2
For inelastic collision between two spherical rigid bodies
a) the linear momentum is not conserved
b) the total mechanical energy is not conserved
c) the total kinetic energy is conserved
d) the linear momentum is conserved
Answer »Answer: (d)
For inelastic collision between two spherical rigid bodies K.E. is not conserved as it is converted into other forms like heat, light sound etc. but total linear momentum is conserved.
Question : 3
Frictional force
a) may act in the direction of motion
b) always acts in the direction of motion
c) always acts opposite to the direction of motion
d) always acts perpendicular to the direction of motion
Answer »Answer: (a)
Friction always apposes relative motion between surfaces in contact and hence can act in any direction to oppose the relative motion.
Question : 4
Consider the following statements: A simple pendulum is set into oscillation. Then:
- the acceleration is zero when the bob passes through the mean position.
- in each cycle, the bob attains a given velocity twice.
- both acceleration and velocity of the bob are zero when it reaches its extreme position during the oscillation.
- the amplitude of oscillation of the simple pendulum decreases with time.
a) 1, 2 and 4
b) 1 and 2
c) 3 and 4
d) 2, 3 and 4
Answer »Answer: (a)
The bob of a simple pendulum is attached to a string which pulls the bob along its length.
<img src="<?php echo $path."/adminicon/bunch/images/physics-mechanics-mcq-question-solution-2.png";?>" title="physics-mechanics" alt="physics-mcq-quiz-pdf" class="img-fluid m-3 mx-auto d-block" />
Here B and C are extreme positions whereas A is the mean position. The speed of the bob increases as it approaches the mean position A and continues to move till it reaches C.
At C the speed becomes zero. Due to the unbalanced force, the bob moves towards the mean position. The speed of the bob is maximum at the mean position and is zero at the extreme positions.
Thus, it is clear that in each cycle bob velocity increases from zero to maximum. This means that it attains a given velocity twice.
Suppose the bob of the pendulum reaches up to B while oscillating, then AB is the amplitude. For the next oscillation, the bob fails to reach B but it will reverse the direction from point B′ instead of B. The amplitude of oscillation in the second case is AB′ which is less than AB.
That means a retarding force is acting on the bob thereby reducing the amplitude of oscillation. This retarding force is nothing but air resistance or air friction. At an extreme position, acceleration is maximum.
So statement 3 is not correct.
Question : 5
Which one among the following is correct for resultant of balanced forces?
a) It varies continuously
b) It is non-zero
c) It is zero
d) None of the above
Answer »Answer: (c)
Question : 6
Two teams are pulling a rope with equal and opposite forces each of 5 kN in a tug of war so that a condition of equilibrium exists. What will be the tensile force in the rope?
a) 5 kN
b) 2.5 kN
c) Zero
d) 10 kN
Answer »Answer: (a)
Verbal Reasoning
Question & Answer Quiz
Non Verbal Reasoning
Question & Answer Quiz
Quantitative Aptitude
Question & Answer Quiz
Computer MCQ
Question & Answer Quiz
General English
Question & Answer Quiz
History GK
Question & Answer Quiz
Polity GK
Question & Answer Quiz
Geography GK
Question & Answer Quiz
Economy GK
Question & Answer Quiz
General Awareness GK
Question & Answer Quiz
Recently Added Subject & Categories For All Competitive Exams
Series Completion Questions & Answers PDF IBPS Clerk 2024
Top Alphabet Number Series Completion based Verbal Reasoning Multiple choice questions with answers PDF, & Free IBPS Mock tests For IBPS Clerk Prelims 2024
Continue Reading »
New 150+ Percentage Questions For IBPS Clerk Prelims 2024
Free Top Percentage Quants Aptitude based Multiple Choice Questions and Answers Practice Test Series, Quiz PDF & Mock Test for IBPS Clerk Prelims 2024 Exam
Continue Reading »
Classification Reasoning MCQ For IBPS Clerk Prelims 2024
Most Important 100+ Classification based Verbal Reasoning Ability Multiple choice questions and answers PDF, Free New Mock tests For IBPS Clerk Prelims 2024
Continue Reading »
Ratio and Proportion Questions with Solutions, IBPS Clerk
New Ratio and Proportion Quants Aptitude based Multiple Choice Questions and Answers Practice Test Series, Quiz & Mock Test for IBPS Clerk Prelims 2024 Exam
Continue Reading »