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Published on: 03/12/2019
Motion
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
The following graph shows the motion of a car. What do you infer from the graph along OA and AB? What is the speed of the car along AB and what time it reached this speed.
2.
In which direction of the motion of the particles does centripetal force act?
parallel
radial
tangential
perpendicular
3.
The hands of the clock, the spokes of wheel are example of _______
linear motion
circular motion
oscillatory motion
revolutionary motion
4.
Force involved in uniform circular motion is given by _____________.
f = mv2/r
f = mvr
f = mr2/v
f = v2/r
5.
When a body starts from rest, the acceleration of the body after 2 second in _____________ of its displacement.
Half
Twice
Four times
One fourth
6.
The area under velocity time graph represents
Velocity of the moving object
Displacement covered by the moving object
Speed of the moving object
7.
The diagram shows the position of a ball it rolls down a track - the ball took 0.5s sec to roll from one position to other.
(a) State where the motion of the ball is uniform or non-uniform motion.
(b) What is the distance travelled by the ball in 2.5 s?
(c) Find the average velocity of the ball from. A to F.
8.
A car moving along a straight line covers a distance of 1 km towards the east in 100s. Find the
(i) Speed of the car.
(ii) The velocity of the car.
9.
Complete of following sentences
a. The acceleration of the body that moves with a uniform velocity will be ________
b. A train travels from A to station B with a velocity of 100 km/h and returns from station B to station A with a velocity of 80km/h. Its average velocity during the whole journey in ______________ and its average speed is ____________
10.
A motorcycle travelling at 20ms-1 has an acceleration of 4ms-2. What does it explains about the velocity of the motorcycle.
11.
A student takes 15 minutes to travel from his home to school with a uniform speed of 5km/h. What is the distance of his school from the home?
12.
How is washing machine wash the clothes?
13.
Give two examples for centrifugal force.
14.
What is centrifugal force?
15.
What is centripetal force?
1.
(a) From O to A the body is said to have uniform acceleration and from A to B the body is said to have zero acceleration.
(b) Along OA the speed is increasing uniformly with respect to time and along AB the speed remains constant.
2.
(d)
perpendicular
3.
(b)
circular motion
4.
(a)
f = mv2/r
5.
(a)
Half
6.
(b)
Displacement covered by the moving object
7.
(a) It is a non-uniform motion
(b) 20 cm
(c) Velocity = \(\frac { Displacement }{ time\ taken } \)
=\(\frac { Total\ distance }{ time\ taken } \)
=\(\frac { 20\times 10^{ -2 } }{ 2.5 } \)
= \(\frac { 2 }{ 2.5 } \) = 0.08 m/s (or) cm/s.
8.
(i) Speed = \(\frac { Distance }{ Time } \)= Distance = 1 km = 1000 m
Time =100 s
Speed = \(\frac { 1000 }{ 100 } \) =10 m/s
(ii) \(\frac { Displacement }{ time } \) = Velocity
Displacement = 1 km = 1000 m
Time = 100 s
Velocity = \(\frac { 1000 }{ 100 } \) = 10 m/s.
9.
(a) Zero (b) 2 hours ; 90 km/h
10.
The motorcycle has an acceleration of 4m/s2, the velocity is increasing at the rate of 4 metre per second.
11.
Speed = 5 km/m = \(\frac { 5000 }{ 3600 } \) m/s
Time = 15 min = 15 x 60 sec
Distance = Speed x time
=\(\frac { 5000 }{ 3600 } \) x 15 x 60 = 1250 m
12.
A spin dryer removes excess water from clothing by rotating a perforated drum at high speed. The water is thrown out through the holes. The clothes keep moving in a circle because the contact force of the drum provides centripetal force.
13.
(i) The dryer in a washing machine is an example for the application of centrifugal force.
(ii) When we go for a ride in a merry-go-round in amusement parks, we experience an outward pull as merry-go-round rotates about vertical axis. This is due to centrifugal force.
14.
Force acting on a body away from the centre of circular path is called centrifugal force. Thus, centrifugal force is in a direction opposite to the direction of centripetal force. Its magnitude is same as that of centripetal force.
15.
The motion of a stone in circular path with constant speed and continuous change of direction is an accelerated motion. There must be an acceleration acting along the string directed inwards, which makes the stone to move in circular path. This acceleration is known as centripetal acceleration and the force is known as centripetal force.
9th Standard Syllabus & Materials
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
