Motion and Time Test

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Motion and Time Test - 6

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Question 1
1 / -0

When a graph between two physical quantities is a straight line, the two quantities are

A
Both constant

B
Independent of each other

C
Directly proportional

D
Inversely proportional

Solution

As we know the equation of a straight line is $$Y=mX+C$$
Let us assume $$X$$ and $$Y$$ are two different physical quantity and C is any constant. and the graph between them is straight line.
According to above equation,
$$Y\propto X$$
Hence, $$X$$ and $$Y$$ are Directly proportional.
Option C
Question 2
1 / -0

Four cars A, B, C and D are moving on a leveled road. Their distance versus time graphs are shown in the given figure. Choose the correct statement

A
Car A is faster than car D.

B
Car B is the slowest.

C
Car D is faster than car C.

D
Car C is the slowest.

Solution

The slope of distance vs time graphs represent speed. B has the minimum slope and hence the minimum speed.
Question 3
1 / -0

A vehicle is moving on a road. Ink drops are falling, one at a time, on the road from the vehicle. After the vehicle has moved away, what one observes is shown (qualitatively) in the figure given below. From the figure we can conclude about the vehicle to be moving...

A
From left to right with increasing speed

B
From left to right with decreasing speed

C
From right to left with increasing speed

D
From right to left with decreasing speed

Solution

As we can see the curved surface is towards the left side so the vehicle is moving from left to right and the distance between drops decreases continuously so the speed of the vehicle decreasing.
Question 4
1 / -0

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

A
Straight line

B
Zig-Zag

C
Curved line

D
Cicular

Solution

In uniform motion, the object moves along a straight path i.e. the path of object is a straight line.
Question 5
1 / -0

A driver is driving his car along a road is shown in figure. The driver makes sure that the speedometer reads exactly $$40 {km}/{h}$$. What happens to the speed of the car from $$P$$ to $$R$$ ?

A
Speed remains constant

B
Speed first increases then decreases

C
Speed first decreases then increases

D
Nothing can be decided

Solution

The driver makes sure that the speedometer reads exactly $$40km/h.$$
The speedometer reads the speed of the car. If the reading of the speedometer is constant then the speed remains constant.
Question 6
1 / -0

Given distance $$(S)$$-time $$(t)$$ graph represents motion with :

A
uniform velocity

B
uniform acceleration with initial velocity

C
uniform retardation with steady rate

D
none of the above

Solution

In the given graph the object travels equal distances in equal intervals of time.
Hence, the body possess uniform velocity.
Option A is the correct answer.
Question 7
1 / -0

Which of the following distance-time graphs is possible?

A

B

C

D
Question 8
1 / -0

When the distance an object travels is directly proportional to the time, it is said to travel with

A
Constant speed

B
Zero velocity

C
Constant acceleration

D
Uniform velocity

Solution

When the distance an object travels is directly proportional to time, it is said to travel with Constant Speed.

$$ Speed = \dfrac{distance \ travelled}{time}$$
Question 9
1 / -0

When the distance covered by an object is directly proportional to the time interval, it is said to travel with :

A
Constant speed

B
Zero velocity

C
Constant acceleration

D
Uniform velocity

Solution

When distance is proportional to time, the ratio of distance and time remains constant. This means that in equal time intervals, the particle is travelling equal distances. So clearly the speed of the particle remains constant.
A is the correct answer.
Question 10
1 / -0

An aeroplane cruising in the air is an example of

A
uniform motion

B
non uniform motion

C
either uniform or non uniform motion

D
neither uniform nor non uniform motion

Solution

An aeroplane cruising in the air moves with a constant speed. So, its motion is uniform motion.