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) It will be equal to R
(b) It will be less than R
(c) It will be greater than R
(d) It shall depend on the material of the road
The correct answers to the above question in:
Answer: (b)
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 wide handle of screw is based upon
a) turning moment of force
b) law of conservation of linear momentum
c) Newton’s second law of motion
d) None of these
Answer »Answer: (a)
Question : 2
Which one of the following statements regarding artificial satellite of the earth is incorrect ?
a) The period of revolution is large if the radius of its orbit is large
b) A minimum velocity of 8 km/sec is required by a satellite to orbit quite close to the earth
c) The orbital velocity depends on the mass of the satelllite
d) The height of a geostationary satellite is about 36000 km from earth
Answer »Answer: (c)
$V_O=√{gR}$
i.e., $v_0$ independent of the mass of the satellite.
Question : 3
A hole is drilled through the earth along the diameter and a stone is dropped into it. When the stone is at the centre of earth, it possesses
a) acceleration
b) mass
c) weight
d) potential energy
Answer »Answer: (b)
At the centre of the earth, weight is zero as g = 0 at the centre of the earth.
weight = mg = 0 and Potential energy = mgh
But mass ≠ 0 as mass is the quantity of matter.
Question : 4
Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is
a) v/2
b) v/3
c) v
d) zero
Answer »Answer: (a)
Question : 5
If the earth rotates faster than its present speed, the weight of an object will
a) remain unchaged at the equator but decrease at the poles
b) decrease at the equator but remain unchanged at the poles
c) increase at the equator but remain unchaged at the poles
d) remain unchanged at the equator but increase at the poles
Answer »Answer: (b)
$g'=g- ω^2Rcos^2λ$
Question : 6
In an explosion, a body breaks up into two pieces of unequal masses. In this
a) heavier part will have more momentum
b) lighter part will have more momentum
c) both parts will have numerically equal momentum
d) both parts will have equal kinetic energy
Answer »Answer: (c)
Both part will have numerically equal momentum and lighter part will have more velocity.
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