9th Class Science Time and Motion Question Bank

MCQs - Motion Total Questions - 45

1)

The numerical ratio of displacement and distance for a moving object is (NCERT Exemplar)

A)
always less than 1

B)
always equal to 1

C)
always more than 1

D)
equal to or less than 1
View Solution
2)

In which of the following cases of motion, the distance moved and the magnitude of displacement are equal?

A)
If the car is moving on a straight road

B)
If the car is moving on a circular road

C)
If the pendulum is moving to and fro

D)
If a planet is moving around the sun
View Solution
3)

Magnitude of displacement is greater than the distance travelled by the object.

A)
True

B)
False

C)
Can't say

D)
Partially true/false
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4)

Odometer measures ......... covered by the vehicles.

A)
distance

B)
displacement

C)
frame of reference

D)
reference point
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5)

If an object is moving with constant velocity, then the motion is

A)
speed

B)
uniform acceleration

C)
uniform motion

D)
non-uniform motion
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6)

What does the path of an object look like when it is in a uniform motion?

A)
Straight

B)
Curved

C)
Zig-zag

D)
Circular
View Solution
7)

The speed of a moving object is determined to be 0.06 m/s. This speed is equal to

A)
2.16 km/h

B)
1.08 km/h

C)
0.216 km/h

D)
0.0216 km/h
View Solution
8)

The ratio of magnitudes of average speed and average velocity, is

A)
always less than one

B)
always equal to one

C)
always more than one

D)
equal to or more than one
View Solution
9)

Speedometer is a device which is used to measure

A)
average speed

B)
average acceleration

C)
instantaneous speed

D)
instantaneous acceleration
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10)

A motorcar travels with a speed \[{{v}_{1}}\] from A to B and returns back from B to A with a speed \[{{v}_{2}}\]. The average speed of the car during its journey is

A)
\[\frac{{{V}_{1}}+{{V}_{2}}}{2}\]

B)
\[\frac{{{V}_{1}}{{V}_{2}}}{{{V}_{1}}+{{V}_{2}}}\]

C)
\[\frac{2{{V}_{1}}{{V}_{2}}}{{{V}_{1}}+{{V}_{2}}}\]

D)
\[\sqrt{{{V}_{1}}{{V}_{2}}}\]
View Solution
11)

A bridge is 400 m long. A 150 m long train crosses the bridge at a speed of 50 m/s. Time taken by the train to cross it.

A)
5 s

B)
8 s

C)
6 s

D)
11 s
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12)

To specify the speed of an object, we - require only .......

A)
magnitudes

B)
direction

C)
Both [a] and [b]

D)
None of the above
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13)

An object travels 24 m with a speed of 4 m/s and then another 32 m with speed of 8 m/s . The average speed of the object is

A)
6 m/s

B)
4 m/s

C)
5.6m/s

D)
6.5m/s
View Solution
14)

A particle moving in a straight line covers half the distance with speed of 3 m/s. The another half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s, respectively. The average speed of the particle during this motion is

A)
4.0 m/s

B)
5.0 m/s

C)
5.5m/s

D)
4.8m/s
View Solution
15)

A point object transverses half the distance with velocity \[{{v}_{0}}\]. The remaining part of the distance is covered with velocity \[{{v}_{1}}\] for the half of the time and with velocity \[{{v}_{2}}\] for the rest half. The average velocity of the object for the whole journey is

A)
\[2{{V}_{1}}\left( {{V}_{0}}+{{V}_{2}} \right)/\left( {{V}_{0}}+2{{V}_{1}}+2{{V}_{2}} \right)\]

B)
\[2{{V}_{0}}\left( {{V}_{0}}+{{V}_{1}} \right)/\left( {{V}_{0}}+{{V}_{1}}+{{V}_{2}} \right)\]

C)
\[2{{V}_{0}}\left( {{V}_{1}}+{{V}_{2}} \right)/\left( {{V}_{1}}+{{V}_{2}}+2{{V}_{0}} \right)\]

D)
\[2{{V}_{2}}\left( {{V}_{0}}+{{V}_{1}} \right)/\left( {{V}_{1}}+2{{V}_{2}}+{{V}_{0}} \right)\]
View Solution
16)

Rajeev went from Delhi to Chandigarh and returned to Delhi on his motorbike. The odometer of that read 4200 km at the start of trip and 4460 km at the end of his trip. If Rajeev took 4 h 20 min to complete his trip, then find the average velocity in km/h.

A)
zero

B)
60 km/h

C)
6 km/h

D)
180 km/h
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17)

If velocity of an object decreases with time, then it is called

A)
retardation

B)
de-acceleration

C)
negative acceleration

D)
All of the above
View Solution
18)

A particle is travelling with a constant speed. This means

A)
its position remains constant as time passes

B)
it covers equal distance in equal time intervals

C)
its acceleration is zero

D)
it does not change its direction of motion
View Solution
19)

A particle cannot be accelerated if its...... is constant.

A)
Speed

B)
Velocity

C)
Distance

D)
Displacement
View Solution
20)

The acceleration of a car that speeds up from 12 m/s to 30 m/s in 15 s, is

A)
\[2.4\text{ }m/{{s}^{2}}\]

B)
\[1.2\text{ }m/{{s}^{2}}\]

C)
\[2\text{ }m/{{s}^{2}}\]

D)
\[5.2\text{ }m/{{s}^{2}}\]
View Solution
21)

If the displacement of an object is proportional to the square of time, then the object is moving with

A)
a uniform velocity

B)
a uniform acceleration

C)
increasing acceleration

D)
decreasing acceleration
View Solution
22)

A woman is wearing her seat belt, while driving at 60 km/h. She finds it necessary to slam on her brakes and slows uniformly to a stop in 1.6 s. What is the average acceleration experienced by her?

A)
\[-10.4\ m/{{s}^{2}}\]

B)
\[10.4\ m/{{s}^{2}}\]

C)
\[1.04\ m/{{s}^{2}}\]

D)
\[-1.04\ m/{{s}^{2}}\]
View Solution
23)

The position of a particle moving along the X-axis at certain times is given below

t(s) 0 1 2 3

x(m) -2 0 6 16

Which of the following describes the motion correctly?

A)
Uniform, accelerated

B)
Uniform, decelerated

C)
Non-uniform, accelerated

D)
There is not enough data for generalisation.
View Solution

Match the Column I with Column II and choose appropriate option from the codes given below

	Column I (Acceleration)		Column II (Example)
(a)	In the direction of motion	1.	Motion of freely falling body
(b)	Against the direction of motion	2.	Car moves through congested market
(c)	Uniform	3.	Brakes applied to
(d)	Non-uniform	4.	Train starts moving from a station

Codes