set 5 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) power
(b) voltage
(c) current
(d) electric energy
The correct answers to the above question in:
Answer: (d)
W – hr is a unit of energy.
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 5) Online Quiz
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Read more mechanics work and energy Based General Science Questions and Answers
Question : 1
The work done becomes zero if
a) force acting on the body is zero
b) displacement is zero
c) force perpendicular to the displacement
d) All of the above
Answer »Answer: (d)
Question : 2
Match the Column I and Column II.
Column I | Column II |
A. Electric motor | P. Electrical energy to sound energy |
B. Electric bell | Q. Electrical energy to mechanical energy |
C. Electric bulb | R. Light energy to electrical energy |
D. Photoelectric | S. Heat energy to mechanical cell energy |
E. Steam engine | T. Electric energy to light energy |
a) A-Q; B-P; C-T; D-S; E-R
b) A-Q; B-P; C-T; D-T; E-S
c) A-P; B-Q; C-T; D-R; E-S
d) A-Q; B-P; C-T; D-R; E-S
Answer »Answer: (d)
Question : 3
SI unit of pressure is
a) pascal
b) bar
c) atmosphere
d) mm of Hg
Answer »Answer: (a)
1 pascal = 1 N / m2.
Question : 4
In cricket match, while catching a fast moving ball, a fielder in the ground gradually pulls his hands backwards with the moving ball to reduce the velocity to zero. The act represents
a) Newton’s third law of motion
b) Newton’s second law of motion
c) Newton’s first law of motion
d) Law of conservation of energy
Answer »Answer: (b)
Question : 5
Which one of the following physical quantities is represented by the shaded area in the given graph?
a) Power
b) Impulse
c) Torque
d) Work done
Answer »Answer: (d)
Question : 6
A gymnast takes turns with her arms and legs stretched. When she pulls her arms and legs
a) the angular velocity stays constant
b) the moment of inertia decreases
c) the angular velocity decreases
d) the angular momentum increases
Answer »Answer: (b)
Since no external torque act on the gymnast, so angular momentum (L = Iw) is conserved.
After pulling her arms & legs, the angular velocity increases but the moment of inertia of gymnasts, decreases in, such a way that angular momentum remains constant.
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