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) 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
The correct answers to the above question in:
Answer: (c)
$V_O=√{gR}$
i.e., $v_0$ independent of the mass of the satellite.
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
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 : 2
Consider the following features of newer models of motor cars:
- Radial tyres
- Streamlined body
- Multipoint fuel injection
- Catalytic converter with exhaust
a) 2, 3 and 4
b) 1 and 2
c) 2 and 3
d) 1, 3 and 4
Answer »Answer: (c)
A “streamlined” design is one in which objects that move through a gas or liquid are shaped to match these lines, and therefore, reduce the energy required to produce that motion.
Multi-point fuel injection system injects fuel into individual cylinders, based on commands from the ‘onboard engine management system computer—popularly known as the Engine Control Unit/ECU.
These techniques result not only in better ‘power balance’ amongst the cylinders but also in higher output from each one of them, along with faster throttle response. The other two options radial tyres and catalytic converter with exhaust do not contribute to making the car more fuel efficient.
Question : 3
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 : 4
A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?
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
Answer »Answer: (b)
Question : 5
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)
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