Motion and Time Test

Result

Motion and Time Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following distance-time graphs shows a truck moving with speed which is not constant ?

A

B

C

D

Solution

$$(i)$$ In a $$distance- time$$ graph, the constant speed of a truck will be represented by a straight line.

$$(ii)$$ In a $$distance- time$$ graph, a straight parallel to the time axis indicates that the truck is not moving.

$$(iii)$$ A curved line on the $$distance- time$$ graph indicates that the truck is moving with a speed which is not constant.

$$(iv)$$ In a $$distance- time$$ graph, the constant speed of a truck will be represented by a straight line.

Hence, option $$c$$ is correct answer.
Question 2
1 / -0

In the given distance-time graph, what is the time corresponding to $$3 \ km$$ ?

A
$$1 \ min$$

B
$$2 \ min$$

C
$$3 \ min$$

D
$$4 \ min$$

Solution

We know that the slope of the distance-time graph gives us the speed of the object. Since the slope is constant for the graph, the speed is also constant.
As seen from the graph the speed is $$1\ km/min$$.
So, to travel $$3\ km$$ it will take $$3\ min$$.

Hence, time corresponding to $$3 \ km$$ will be $$3 \ min$$

$$\therefore$$ Option (C) is correct.
Question 3
1 / -0

Which of the following is used for measuring time ?

A
Fitbit

B
Playstation

C
Oculus Rift

D
LASER

Solution

Fitbit is used for measuring time nowadays.
Playstation is a gaming console, Oculus Rift is a virtual reality headset whereas LASER is a type of light source.
Question 4
1 / -0

A scooterist covers a distance of 3 km in 5 minutes. He travels with a speed of

A
$$100 m s^{-1}$$

B
$$360 km h^{-1}$$

C
$$100 cm s^{-1}$$

D
$$600 m min^{-1}$$

Solution
Question 5
1 / -0

Which of the following is not a unit of speed?

A
Meter/second

B
Second/meter

C
Kilometer/hour

D
Meter/minute.
Question 6
1 / -0

Match the columns and select the correct option from the codes given below.
Column-I Column-II
(a) Days (i) Second
(b) Months (ii) m/s
(c) Time (iii) Metre
(d) Speed (iv) The time from one sunrise to the next
(e) Distance (v) One new moon to the next.
a b c d e

A
(v) (i) (ii) (iii) (iv)

B
(iv) (v) (i) (ii) (iii)

C
(ii) (iii) (iv) (v) (i)

D
(i) (ii) (iii) (iv)

Solution
Question 7
1 / -0

The earliest clocks made by Egyptians in year 800 BC for measuring time was :

A
sundial

B
compass

C
stop watch

D
pendulum clock

Solution

Sundial was the earliest clock made by the Egyptians in year 800 BC to measure time.
Question 8
1 / -0

$$I$$. A train runs from New Delhi to Hyderabad. It covers first distance of 240 km in 7 hrs. and nest distance of 360 km in 6 hrs.
$$II$$. Gopi takes part in a car race. He drive a distance of 70 km each in the first, second and third hours.
Which of the following statements is true.

A
$$I$$, is an example uniform motion and $$II$$ is an example of non-uniform motion.

B
$$I$$ is an example of non-uniform motion and $$II$$ is an example of uniform motion.

C
$$I$$ and $$II$$ are examples of uniform motion.

D
$$I$$ and $$II$$ are example of non-uniform motion.

Solution

$$I$$ :
Speed of train while covering a distance of 240 \ km, $$u = \dfrac{240}{7} = 34.3 \ km/h$$
Speed of train while covering a distance of 360 \ km, $$u = \dfrac{360}{6} = 60 \ km/h$$
Thus speed of train changed and hence motion of train is an example of non-uniform motion.
$$II$$ :
Speed of Gopi in the car race remains the same in first, second and third hour.
Thus his motion is an example dof uniform motion.
Correct answer is option B.
Question 9
1 / -0

$$150\ m$$ long train takes $$10\ s$$ to pass a man who is going in the same direction at the speed of $$2\ kmph$$. What is the speed of the train?

A
$$52\ kmph$$

B
$$56\ kmph$$

C
$$84\ kmph$$

D
Data inadequate

Solution

Let the speed of the train be $$x\ kmph$$
Length of the train $$ = 150 m = \dfrac{150}{1000} = \dfrac{3}{20} km$$
and time taken to cross the man = $$10$$ seconds = $$\dfrac{10}{60 \times 60}$$
Relative speed = $$(x - 2)\ kmph$$
(Both are moving in same direction)
We know that,
$$\dfrac{\text{Length of the train}}{\text{Relative speed}} = $$ Time taken to cross the man
Relative speed = $$\dfrac{3 \times 360}{20 \times 1}$$
$$x - 2 = \dfrac{3 \times 360}{20 \times 1}$$
$$ x = 54 + 2 = 56\ kmph$$
Hence, speed of train is $$56\ kmph$$.
Question 10
1 / -0

Speedometer of a car measures

A
average speed

B
average velocity

C
instantaneous speed

D
instantaneous velocity

Solution

Speedometer is device that measure the speed of vehicle, at any instant of time i.e measure instantaneous speed.

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Re-Attempt Weekly Quiz Competition

	Column-I		Column-II
(a)	Days	(i)	Second
(b)	Months	(ii)	m/s
(c)	Time	(iii)	Metre
(d)	Speed	(iv)	The time from one sunrise to the next
(e)	Distance	(v)	One new moon to the next.

Motion and Time Test - 15

Result

Motion and Time Test - 15

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Question 1

Solution

Question 2

$$1 \ min$$

$$2 \ min$$

$$3 \ min$$

$$4 \ min$$

Solution

Question 3

Fitbit

Playstation

Oculus Rift

LASER

Solution

Question 4

$$100 m s^{-1}$$

$$360 km h^{-1}$$

$$100 cm s^{-1}$$

$$600 m min^{-1}$$

Solution

Question 5

Meter/second

Second/meter

Kilometer/hour

Meter/minute.

Question 6

(v) (i) (ii) (iii) (iv)

(iv) (v) (i) (ii) (iii)

(ii) (iii) (iv) (v) (i)

(i) (ii) (iii) (iv)

Solution

Question 7

sundial

compass

stop watch

pendulum clock

Solution

Question 8

$$I$$, is an example uniform motion and $$II$$ is an example of non-uniform motion.

$$I$$ is an example of non-uniform motion and $$II$$ is an example of uniform motion.

$$I$$ and $$II$$ are examples of uniform motion.

$$I$$ and $$II$$ are example of non-uniform motion.

Solution

Question 9

$$52\ kmph$$

$$56\ kmph$$

$$84\ kmph$$

Data inadequate

Solution

Question 10

average speed

average velocity

instantaneous speed

instantaneous velocity

Solution

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