set 4 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) 4 times
(b) 1/2 times
(c) 2 times
(d) 1 times
The correct answers to the above question in:
Answer: (a)
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 4) Online Quiz
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Read more mechanics work and energy Based General Science Questions and Answers
Question : 1
Which of the following are examples of uniform velocity?
a) Motion of car on crowded road
b) Motion of planet around sun
c) Motion of moon around earth
d) Motion of a moving fan
Answer »Answer: (c)
Uniform velocity:
Definition: The condition in which a body covers an equal level of distances in unequal intervals of time is called the uniform velocity.
Examples of uniform velocity
When a particle moves with a uniform velocity, the slope of a displacement-time graph (Fig) is constant at all points.
It is a stable velocity, i.e., the velocity that does not change with time in scale or direction in space. This means that a body has this type of velocity if it travels at a constant speed along an instant line (i.e., in an exacting direction). There has been no change in either speed or direction.
The following are some examples:
- The Moon’s orbit around the Earth
- The movement of a watch’s hands
- Earth’s Rotation Earth’s Revolution
- Raindrops fall on the Earth’s surface. This is the velocity with which a body moves once it is started on a frictionless surface.
- All circular motion is an example: the movement of a fan and our clock hand.
Question : 2
Consider the following statements :
- A person standing for a long time with a suitcase on his head does no work in terms of physics.
- There cannot be any displacement of an object in the absence of any force acting on it.
- The law of conservation of energy is valid in all situations and for all kinds of transformations.
a) 2 and 3
b) 1 and 2
c) 1 and 3
d) 1, 2 and 3
Answer »Answer: (c)
Yes. If a particle is moving and there is no force on it, then it will continue to move with constant velocity.
Thus it will have displacement.
Question : 3
Which of the following time-displacement graph is not possible in nature?
a)
b)
c)
d)
Answer: (b)
Question : 4
A man is standing on a sensitive balance. If he inhales deeply, the reading of the balance
a) Remains unaffected
b) Decreases
c) Increases
d) May increase or decrease depending on the atmospheric pressure
Answer »Answer: (c)
Question : 5
A jet plane moves up in air because
a) the flow of air around the wings causes an upward force, which compensates for the force of gravity
b) the thrust of the jet compensates for the force of gravity
c) the gravity does not act on bodies moving with high speeds
d) the weight of air whose volume is equal to the volume of the plane is more than the weight of the plane
Answer »Answer: (b)
When a jet plane flies, it ejects gases in a backward direction at a very high velocity.
From Newton’s third law, these gases provide the momentum for the jet plane in the forward direction plus compensate for the force of gravity.
Question : 6
A system of masses connected by a string, passing over pulleys A and B as shown in the figure. The pulleys are massless. Match the columns : (Take g = 10 m/$s^2$)
| Column I | Column II |
| A. Acceleration of mass 4 kg, $a_1$ | 1. 2 m/$s^2$ |
| B. Acceleration of mass 6 kg, $a^2$ | 2. 4 m/$s^2$ |
| C. Acceleration of mass 15 kg, $a^3$ | 3. 8 m/$s^2$ |
| 4. zero |
a) A – 2 ; B – 3 ; C – 1
b) A – 2 ; B – 4 ; C – 1
c) A – 1 ; B – 2 ; C – 3
d) A – 4 ; B – 3 ; C – 2
Answer »Answer: (b)
A → (2) ; B → (4) ; C → (1)
The acceleration of mass 15 kg
a3 = $[\text"15 - (6 + 4)"/\text"15 + 6 + 4"]$g = 2 m/s2
The acceleration of masses 4 kg and 6 kg with respect to pulley B is,
a = ${(6 – 4)}/{(6 + 4)}$ g = 2 m/s2.
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