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) 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
The correct answers to the above question in:
Answer: (a)
Friction always apposes relative motion between surfaces in contact and hence can act in any direction to oppose the relative motion.
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Question : 1
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 : 2
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 : 3
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)
Question : 4
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 : 5
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 : 6
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.
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