Motion Test

Motion

This is Motion Test-02 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

A body moves in a uniform circular motion

A
it is moving with constant velocity.
B
none of these
C
its acceleration is zero
D
the body has an acceleration
Correct

\({\text{18}}{0^0}\)plane angle is equal to

A
π radian
Correct
B
2π radian
C
none of these
D
\(\frac{\pi }{2}\)radian

A body is travelling at a constant speed in a circle it has

A
constant velocity
B
it is not accelerated
C
an inward radial acceleration
Correct
D
an outward radial acceleration.

Statement A: Uniform circular motion is a case of accelerated motion Statement B: In third equation of motion we do not have the time.

A
both the statement A and B are true
Correct
B
statement A is true, B is false
C
neither statement A nor statement B is true.
D
statement B is true, A is false

If two objects move in circular path of radii in the ratio of 1:3 and take same time to complete the circle, what is the ratio of their speeds?

A
\(\frac{{{r_1}}}{{{r_2}}}\)
B
\(\frac{{{r_2}}}{{{r_1}}}\)
C
none of these
Correct
D
1

Which of the following is correct about uniform circular motion? A Direction of motion is continuously changed B Direction of motion is not changed C Speed and direction both remain constant D Speed is constant, but direction is changing

A
All of these
B
(a), (b) and (c) are correct
C
(a) and (d) are correct
Correct
D
(b) and (c) are correct

Which of the quantities – speed, time, velocity and acceleration have the same SI unit?

A
velocity, time
B
velocity, acceleration
C
speed, velocity
Correct
D
Acceleration, time.

Find the correct statement

A
displacement is a scalar quantity
B
the S. I unit of retardation is –\({\text{m}}{{\text{s}}^{ - {\text{2}}}}\)
Correct
C
the motion of the athletes is uniform
D
all of these.

A body is said to be in rest when

A
body moves in uniform motion w.r.t observer
B
none of these.
C
its position doesn’t change with time with respect to the observer.
Correct
D
its position changes with time w.r.t observer.

A person sitting in the truck projected a ball vertically upwards. The ball

A
falls by the side of car
B
falls outside the car
C
falls in front of the car.
D
falls back in his hand
Correct

Find the incorrect statement

A
none of these.
B
the slope of velocity – time graph gives instantaneous acceleration
C
when a body moves with constant speed its acceleration is zero
Correct
D
the body is said to be accelerating if it moves in a uniform circular motion

Match the following with correct response. (1) Scalar (2) Vector (3) Rectilinear motion (4) Circular motion (A) Magnitude and direction (B) Motion of satellite (C) Non-uniform (D) Magnitude

A
1-C, 2-B, 3-D, 4-A
B
1-D, 2-A, 3-C, 4-B
Correct
C
1-B, 2-D, 3-A, 4-C
D
1-A, 2-C, 3-B, 4-D

Match the following with correct response. (1) Velocity (2) Displacement (3) Acceleration (4) Retardation (A) \(m/{s^2}\)(B) m/s (C) \( - m/{s^2}\)(D) m

A
1-D, 2-A, 3-C, 4-B
B
1-B, 2-D, 3-A, 4-C
Correct
C
1-A, 2-C, 3-B, 4-D
D
1-C, 2-B, 3-D, 4-A

Match the following with correct response. (1) Uniform acceleration (2) Measurement of distance (3) Energy (4) Acceleration (A) Vector quantity (B) Odometer (C) Velocity increases in equal intervals of time (D) Scalar quantity

A
1-C, 2-B, 3-D, 4-A
Correct
B
1-D, 2-A, 3-C, 4-B
C
1-A, 2-C, 3-B, 4-D
D
1-B, 2-D, 3-A, 4-C

Match the following with correct response. (1) v(2) a(3) Vav(4) 2as(A) \(\frac{{v - u}}{t}\)(B) \({v^2} - {u^2}\)(C) \(\frac{{v + u}}{2}\)(D) \(\frac{s}{t}\)

A
1-C, 2-B, 3-D, 4-A
B
1-D, 2-A, 3-C, 4-B
Correct
C
1-A, 2-C, 3-B, 4-D
D
1-B, 2-D, 3-A, 4-C