Motion and Time Test

Result

Motion and Time Test - 16

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Question 1
1 / -0

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

A
stop clocks

B
stop watches

C
wall clocks

D
A and B

Solution

Stop clocks and stop watches are generally used to measure time for short intervals while wall clocks are used to measure time for long intervals.
Question 2
1 / -0

What determine the nature of the path followed by the particle

A
Speed

B
Velocity

C
Acceleration

D
None

Solution

Without initial velocity and acceleration path of the particle cannot be decided. So at a time velocity and acceleration are required to determine the path followed by the particle.
Question 3
1 / -0

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

A
1.5 km

B
6 km

C
10 km

D
90 km

Solution

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 $$30 km/h$$
Question 4
1 / -0

Speedometer measures the speed of the car in

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

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

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

D
km $$min^{-1}$$

Solution

As we know the speedometer used to measure the speed of vehicle and all the vehicle indicate speed in km/h
Hence speedometer also measure speed in km/h
Question 5
1 / -0

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:

A
$$56 \ km/hr$$

B
$$60 \ km/hr$$

C
$$48 \ km/hr$$

D
$$50 \ km/hr$$

Solution

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 $$60 km/h$$
Question 6
1 / -0

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

A
Mass

B
Length

C
Time

D
None of these

Solution

$$LENGTH$$ $$MASS$$ $$TIME$$
$$M.K.S$$ 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.
Question 7
1 / -0

Rajdhini express moves at a speed of $$150\ km/h$$. How long will it take to cover a distance of $$15\ km$$?

A
$$0.1\ h$$

B
$$1.125\ h$$

C
$$2.125\ h$$

D
$$3.125\ h$$

Solution

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
Question 8
1 / -0

Which of the following does not express a time interval?

A
A day

B
A second

C
A school period

D
Time of the first bell in the school

Solution

The correct answer is option (d) Time of the first bell in the school.
Question 9
1 / -0

If we denote speed by $$S$$, distance by $$D$$ and time by $$T$$ the relationship these equation is?

A
$$S= D \times T $$

B
$$T= \frac {S}{D}$$

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

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

Solution

$$speed = \dfrac{distance}{Time}$$
Question 10
1 / -0

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

A
A leaking tap

B
Single pendulum

C
Shadow of an object during the day

D
Blinking of eyes

Solution

"A leaking tap" is the answer because we cannot estimate when will the drop fall.
where as
⇒ simple pendulum shows time by its to and fro motion.
⇒ in olden days the time is estimated by the shadow of an object
⇒ blinking of eyes is rarely seen which blinks by time unless by reflex actions

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

Motion and Time Test - 16

Result

Motion and Time Test - 16

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Question 1

stop clocks

stop watches

wall clocks

A and B

Solution

Question 2

Speed

Velocity

Acceleration

None

Solution

Question 3

1.5 km

6 km

10 km

90 km

Solution

Question 4

m $$s^{-1}$$

km $$h^{-1}$$

cm $$s^{-1}$$

km $$min^{-1}$$

Solution

Question 5

$$56 \ km/hr$$

$$60 \ km/hr$$

$$48 \ km/hr$$

$$50 \ km/hr$$

Solution

Question 6

Mass

Length

Time

None of these

Solution

Question 7

$$0.1\ h$$

$$1.125\ h$$

$$2.125\ h$$

$$3.125\ h$$

Solution

Question 8

A day

A second

A school period

Time of the first bell in the school

Solution

Question 9

$$S= D \times T $$

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

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

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

Solution

Question 10

A leaking tap

Single pendulum

Shadow of an object during the day

Blinking of eyes

Solution

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