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) 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
The correct answers to the above question in:
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.
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 1) Online Quiz
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Question : 1
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 : 2
Consider the following statements:
A 4-wheel vehicle moving in a sharp circular path at high speed will :
- overturn about its outer wheels
- overturn about its inner wheels
- skid outwards
- skid inwards
a) 2 and 3
b) 1 and 3
c) 2 and 4
d) 1 and 4
Answer »Answer: (b)
In the case of an object moving along a circular path two types of forces centripetal and centrifugal act upon it.
As they have opposite impacts thus, the object remains in balance. When centrifugal force gets disturbed then the object will leave the balance and skid in an outward direction.
Question : 3
Statement A:
Pulling a lawn roller is easier than pushing it.
Statement B :
Pushing increases the apparent weight and hence the force of friction.
a) Both statements are correct.
b) Statement B is correct.
c) Statement A is correct.
d) Both statements are incorrect.
Answer »Answer: (c)
Question : 4
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 : 5
The escape velocity of a body depends upon mass as
a) m2
b) m1
c) m0
d) m3
Answer »Answer: (c)
$V_{esc}= √{2gR}$, where R is radius of the planet.
Hence escape velocity is independent of m.
Question : 6
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.
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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.
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