MCQ Questions for Class 7 Physics Motion And Time Quiz 4

Odometer is to mileage as compass is to

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speed
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hiking
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needle
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direction

Which of the following is time measuring device in modern India?

The odometer of a car reads

$57321.0 km$ when the clock shows the time

$08:30$ AM. What is the distance moved by the car, if at

$08:50 AM$ , the odometer reading has changed to

$57336.0 km$ ?

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$75\ km$
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$50\ km$
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$15\ km$
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$10\ km$

Explanation

An odometer is a device that gives us the distance covered by a car.

Distance covered by the car in the given time is

$d = 57336.0 - 57321 = 15.0 \ km$

What is the distance traveled by the body during the first 100 seconds?

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200 m
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50 m
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100 m
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25 m

Which of the following is/are correct regarding uniform and non-uniform motion?

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For the body to be in the uniform motion, it must be moving in the straight line path
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The slope of displacement-time graph for uniform motion is constant and gives constant velocity
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A car coming to a halt is an example of non-uniform motion
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All of the above

Explanation

Two sentences are correct regarding uniform motion:

$1.$ The body must be moving in a straight line path.

$2.$ The slope of displacement time graph for uniform motion is constant and gives constant velocity.

In other words, the velocity should be constant, i.e. its direction and magnitude should be constant.

A car coming to half is an example of non-uniform motion as its speed changes with time, the sentence is correct regarding non-uniform motion

Which of the following is/are good example(s) of non-uniform motion?

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When an object is moving in a circular path with uniform speed
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A car is travelling in an overcrowded zigzag road
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Motion of a pendulum
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Both B and C

Which of the following instrument have very high level of accuracy ?

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Electronic stopwatch
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Stop clock
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Pendulum clock
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Hour glass

Which is in uniform motion from the following?

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The motion of Cristiano Ronaldo in the field
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The motion of Usain Bolt in the race track
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The motion of earth around the sun
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Freely falling body

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

Explanation

$(i)$ 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.

Which of the following is used for measuring time ?

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Fitbit
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Playstation
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Oculus Rift
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LASER

In the given distance-time graph, what is the time corresponding to

$3 \ km$ ?

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$1 \ min$
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$2 \ min$
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$3 \ min$
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$4 \ min$

Explanation

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.

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

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$100 m s^{-1}$
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$360 km h^{-1}$
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$100 cm s^{-1}$
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$600 m min^{-1}$

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

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sundial
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compass
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stop watch
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pendulum clock

$I$ . 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.

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

Explanation

$I$ :
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.

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

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(v) (i) (ii) (iii) (iv)
0%
(iv) (v) (i) (ii) (iii)
0%
(ii) (iii) (iv) (v) (i)
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(i) (ii) (iii) (iv)

$150\ m$ 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?

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$52\ kmph$
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$56\ kmph$
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$84\ kmph$
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Data inadequate

Explanation

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

$56\ kmph$ .

Which of the following is not a unit of speed?

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Meter/second
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Second/meter
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Kilometer/hour
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Meter/minute.

Speedometer of a car measures

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average speed
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average velocity
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instantaneous speed
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instantaneous velocity

In order to measure very short intervals, we mostly use :

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stop clocks
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stop watches
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wall clocks
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A and B

What determine the nature of the path followed by the particle

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Speed
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Velocity
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Acceleration
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None

A scooterist travels at 30 km/h along straight path for 20 min. What is distance?

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1.5 km
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6 km
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10 km
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90 km

Explanation

If the scooter is travelling at precisely

$30 km/h$ in a perfectly straight line.

We know

$1$ hour=

$60$ minutes

Therefore to calculate the distance traveled in the started fraction of the hour.

$\therefore 20$ minutes is

$= \frac{{20}}{{60}} = \frac{1}{3}$ of an hour or

$3.3333$ %

$30\,km \times \frac{1}{3} = 10\,km$

Therefore

$10km$ is the distance traveled in

$20$ minutes of travelling at a speed of

$30 km/h$

Speedometer measures the speed of the car in

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m $s^{-1}$
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km $h^{-1}$
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cm $s^{-1}$
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km $min^{-1}$

A car covers a distance of

$2 \ km$ in

$2.5$ minutes. If it covers half of the distance with speed

$40 \ km/hr$ , the rest distance it shall cover with a speed of:

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$56 \ km/hr$
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$60 \ km/hr$
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$48 \ km/hr$
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$50 \ km/hr$

Explanation

Given that,

Time $t=2.5\min$

Distance $d=2km$

Now, firstly for half distance

$v=\dfrac{d}{t}$

$t=\dfrac{d}{v}$

$t=\dfrac{60\times 60}{40}$

$t=90\,s$

Now, total time is

$t=150-90$

$t=60\,s$

Now, the speed is

$v=\dfrac{d}{t}$

$v=\dfrac{1\times 60}{1}$

$v=60\,km/h$

Hence, the speed is $60 km/h$

Which of the following physical quantities has same unit in all the three system of units?

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Mass
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Length
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Time
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None of these

Explanation

	$LENGTH$	$MASS$	$TIME$
$M.K.S$	Meter	killogram	sec
$C.G.S$	Centi meter	gram	sec
$S.I.$	meter	killogram	sec

The unit of time (i.e. second) is the same in all the three systems of units.

Rajdhini express moves at a speed of

$150\ km/h$ . How long will it take to cover a distance of

$15\ km$ ?

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$0.1\ h$
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$1.125\ h$
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$2.125\ h$
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$3.125\ h$

Explanation

Given,

Speed

$v=150\ km/h$

distance cover = displacement

$d=15\ km$ (Assume express is not changing its direction)

$Velocity\ (V)=\dfrac{Displacement\ (d)}{time\ (t)}$

$t=\dfrac dV=\dfrac{15}{150}=0.1\ hr$

Time taken

$t=0.1\ hr$ Option A

$350\,m$ long train passes over a

$250\,m$ long bridge at a speed of

$54\,km/h$ . How long will it takes to cross the bridge?

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$40\,minutes$
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$2/3\,minutes$
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$2/3\,hr$
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$1/90 s$

Explanation

To cross bridge completely train has to cover distance, which is equal to sum of the length of train and bridge.

Distance to cover

$, S = 250 +350 = 600 m$

Speed of train

$, v = 54km/hr = 54 \times \frac{1000m}{3600s}=15m/s$

Therefore,

Time taken by trian to cross bridge

$, t = \frac{Distance}{Speed}$

$t = \frac{600}{15} =40sec$

$Or \ t= \frac{40}{60} min= \frac{2}{3}min$

Hence option B is correct

If we denote speed by

$S$ , distance by

$D$ and time by

$T$ the relationship these equation is?

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$S= D \times T$
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$T= \frac {S}{D}$
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$S = \frac {1}{T} \times D$
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$S= \frac {T}{D}$

Explanation

$speed = \dfrac{distance}{Time}$

Which one of the following can not be used for measurement of time ?

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A leaking tap
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Single pendulum
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Shadow of an object during the day
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Blinking of eyes

Which of the following time measuring device is most precise?

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A wall clock
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A stop watch
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A digital watch
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An atomic clock

Explanation

The least count of a wall clock, stop watch, digital watch and atomic clock are

$1 \ sec$ ,

$\dfrac{1}{10} \ sec$ ,

$\dfrac{1}{100} \ sec$ and

$\dfrac{1}{10^{11}} \ sec$ respectively. So atomic clock is most precise.

A bus travels 54 km in 90 minutes. The speed of the bus is?

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0.6m/s
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10m/s
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5.4m/s
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3.6 m/s

CBSE Questions for Class 7 Physics Motion And Time Quiz 4 - MCQExams.com

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Practice Class 7 Physics Quiz Questions and Answers

CBSE Questions for Class 7 Physics Motion And Time Quiz 4 - MCQExams.com

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Practice Class 7 Physics Quiz Questions and Answers

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