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10th Science | Physics Assignment Answers 2021
TN SCERT Full Answer Key
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10th Standard Science Unit 1 TN SCERT Assignment Answer key.
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10th Science TN SCERT Unit 1 Answers
- Class:10
- Subject: Science | Physics
- UNIT-1 Laws of motion
Part – A
I. Choose the
correct answer
1. Inertia
of a body depends on--------------
a) Weight of the object
b) acceleration due to gravity
c) mass of the object
d) Both a and b
Ans: c) mass of the object
2. In a
rocket, a large volume of gases produced by the combustion of fuel is allowed
to escape through its tail nozzle in the downward direction with the tremendous
speed and makes the rocket to move upward. Which principle is followed in this
take off of the rocket?
a) Moment of inertia
b) Conservation of momentum
c) Newton’s first law of motion
d) Newton’s
law of gravitation
3. There are
two statements
A) Newton’s
first law is valid from the pilot in an aircraft which is taking off
B) Newton’s
first law is valid from the observer in a train moving with constant velocity
Which of the following is correct?
a) A only
b) B only
c) Both A and B
d) Both A and B wrong
4. Which of the following law is used to
discover new stars and planets?
a) Newton's first law
b) Newton's second law
c) Newton's third law
d) Newton's law of gravitation
5. The
Resultant force of two equal parallel forces acting in opposite direction in
the same line of action is
a) Fnet = F1 + F2
b) Fnet = F2-F1
c) Fnet = F2+F1
d) Fnet=0
Part – B
II. Short Answer
11. Define
Inertia. Give its classification
The inherent property of a body to resist any change in its state of rest or the state of uniform motion, unless it is influenced upon by an external unbalanced force, is known as ‘inertia’.
Classifications:
- Inertia of rest
- Inertia of motion
- Inertia of direction
12. If a 5N and a 15N forces are acting
opposite to one another. Find the resultant force and the direction of action
of the resultant force.
13. State
Newton’s second law.
The force acting on a body is directly proportional to the rate of change of linear momentum of the body and the change in momentum takes place in the direction of the force.
Part – C
III. Write
in Detail
18. What are
the types of Inertia? Give an example for each type
Types of Inertia:
- Inertia of rest: The resistance of a body to change its state of rest is called inertia of rest.
E.g.: When you vigorously shake the branches of a tree, some of the leaves and fruits are detached and they fall down (Inertia of rest).
- The inertia of motion: The resistance of a body to change its state of motion is called inertia of motion.
E.g.: An athlete runs some distance before jumping. Because this will help him jump longer and higher. (Inertia of motion)
- Inertia of direction: The resistance of a body to change its direction of motion is called inertia of direction.
E.g.: When you make a sharp turn while driving a car, you tend to lean sideways, (Inertia of direction).
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