Motion and Time Test

Result

Motion and Time Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following time measuring device is most precise?

A
A wall clock

B
A stop watch

C
A digital watch

D
An atomic clock

Solution

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.
Question 2
1 / -0

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

A
0.6m/s

B
10m/s

C
5.4m/s

D
3.6 m/s

Solution

speed = distance / time
=54 * 1000 /90 * 60
=10 m/s
Question 3
1 / -0

The correct symbol to represent the speed of an object is

A
$$5m/s$$

B
$$5mp$$

C
$$5 m/ sec^{-1} $$

D
$$5 s/m$$

Solution

Velocity is rate of change of displacement with respect to time.
Velocity $$V=\dfrac DT$$
So, unit of velocity $$=\dfrac ms$$
Hence Option : A
Question 4
1 / -0

Which of the following figures represents uniform motion of a moving object correctly?

A

B

C

D

Solution

$$(a)$$
Explanation: Distance is increasing at a uniform rate; as shown by upward slanting straight line. Hence, this graph shows uniform motion.
Question 5
1 / -0

Tick the most appropriate answer.
Which of the following is not a common unit for measuring time ?

A
Hour

B
Mean solar day

C
Year

D
Sundial

Solution

Sundial is a device that uses the shadow cast by a stick placed in sunshine to know the time of the day. It is not a measuring unit of time. It is just a type of clock which tells us the time but is not the unit to measure it.
Hence the correct answer is Option (D), Sundial.
Question 6
1 / -0

Tick the most appropriate answer.
A train departs from Delhi railway station at $$21 : 50$$ hours every day. The time shown in your analog watch at the departure will be

A
$$2 : 50 \ a.m.$$

B
$$9 : 50 \ p.m.$$

C
$$9:50 \ a.m.$$

D
$$11:50 \ p.m.$$

Solution

There are two formats to measure time. The $$24 \ hr$$ format or the $$12 \ hr$$ format. To convert the $$24 \ hr$$ format to $$12 \ hr$$ format we need to subtract $$12$$ from the $$24 \ hr$$ format when the number exceeds $$12$$. For less than $$12$$ we keep it as it is. For greater than $$12$$ we use $$p.m$$ and for less than $$12$$ we use $$a.m.$$

For $$21:50$$ we need to subtract $$12$$. Therefore in $$12 \ hr$$ format, $$21:50$$ will be, $$9:50 \ p.m.$$ , which is our answer.
Question 7
1 / -0

$$18\ km\ h^{-1}$$ is equal to :

A
$$10\ ms^{-1}$$

B
$$5\ ms^{-1}$$

C
$$18\ ms^{-1}$$

D
$$1.8\ ms^{-1}$$

Solution

$$5\ ms^{-1}$$
As, $$1km=1000m$$
and $$ 1\ hour = 60\times 60\ seconds$$
Converting $$\dfrac{18 \times 1000}{60\times 60}=5\ ms^{-1}$$
Question 8
1 / -0

A simple pendulum is set into vibrations. The bob of the pendulum comes to rest after some time due to

A
Air friction

B
Moment of inertia

C
Weight of the bob

D
Combination of all the above

Solution

Air friction causes the oscillating pendulum to damp and thus eventually it comes to rest after some time.
Question 9
1 / -0

The motion of a drawer table can be termed as

A
Periodic motion

B
Circular motion

C
Translatory motion

D
Random motion

Solution

The drawer of the table moves forward in a linear direction. SO, it is a translatory motion.
Question 10
1 / -0

Speed-distance graph of an object in uniform motion which comes to rest suddenly is

A

B

C

D

Solution