Motion and Time Test

Result

Motion and Time Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

A century has:

A
$$100\ years$$

B
$$100\ months$$

C
$$100\ seconds$$

D
$$100\ weeks$$

Solution

$$1\ century = 100\ years$$
A century has 100 years.
Question 2
1 / -0

For measuring time in sports events like sprinting, $$mili second (ms)$$ is a commonly used unit of time. $$1ms=?$$

A
$$10^{-12}s$$

B
$$10^{-9}s$$

C
$$10^{-3}s$$

D
None of these

Solution

$$1\ ms=\dfrac{1}{1000} s=10^{-3}s$$
Question 3
1 / -0

Which of the following methods of measurement of time is suitable for a race?

A
Stop watch

B
Wall clock

C
Simple pendulum

D
Reflection of an object by sun rays

Solution

$$Answer:-$$ A
Stop watch is used because of its precise measurement since its least count is less so able to measure fractions of a second which is required in a race because sometimes time taken by two contestants differ only by a fraction of a second so stopwatch helps in determining the winner.
Question 4
1 / -0

How many seconds are there in a week?

A
60480

B
604800

C
6048000

D
6048

Solution

$$1 week = 7 days$$
$$= 7 days \times 24 hrs/day \times 60 min/hr \times 60 sec/min$$
$$= 604800 s$$
Question 5
1 / -0

Measurement of time can be done with the help of a:

A
Meter scale

B
Pulley

C
Simple pendulum

D
Speedometer

Solution

$$Answer:-$$C
A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force combined with the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum .
This time period when known can be used to measure time.
Question 6
1 / -0

The diagram shows the pattern of the oil dripping on the road, at a constant rate from a moving car.
Which of the following statements is correct?

A
The car moves initially with a constant speed and then slows down

B
The car accelerates initially and then moves with a constant speed

C
The car starts from rest and keeps accelerating

D
The car moves with a constant speed all along

Solution

Initially, the drops are at a uniform separation.The rate of dripping being constant, the motion, then, is with a constant speed.
Later on, the spacing between the drops keeps decreasing.This means, within same time interval, the car covers lesser distance as the time progresses.
So, later, the car slows down.
Question 7
1 / -0

The time taken by the earth to complete one rotation about is own axis is called

A
Solar day

B
Mean solar day

C
1 hour

D
None

Solution

Solar day is defined as the time taken by the earth to complete one rotation about its own axis.
Question 8
1 / -0

Which of the following is/are unit of time

A
Solar day

B
Hour

C
Mean solar day

D
All

Solution

All are units of time. The time taken by the earth to complete one rotation about its own axis is called solar day.
Question 9
1 / -0

A car travels first $$60 \ km$$ of a distance in $$1 \ hr$$, next $$70 \ km$$ of the distance in next hour and remaining $$20 \ km$$ distance in final hour. Then, its motion is:

A
uniform motion

B
non-uniform motion

C
either uniform or non-uniform motion

D
neither uniform nor non-uniform motion

Solution

During first hour, speed = $$\dfrac{60}{1} \ km/h = 60 \ km/hr$$
During second hour, speed = $$\dfrac{70}{1} \ km/h = 70 \ km/hr$$
During third hour, speed = $$\dfrac{20}{1} \ km/h = 20 \ km/hr$$
So, the car travels different distances in equal time intervals. This is an example of non-uniform motion.
Question 10
1 / -0

A person has two hourglasses, one of $$30\ seconds$$ and the other of $$1\ minute$$. Which of the following time intervals can he not measure?

A
$$30\ seconds$$

B
$$60\ seconds$$

C
$$50\ seconds$$

D
$$90\ seconds$$

Solution

A person has two hourglasses, one of $$30\ seconds$$ and the other of $$1\ minute$$.
$$1\ minute=60\ seconds$$
$$\text{H.C.F. of}\ 30\ seconds$$ and $$60\ seconds=30\ seconds$$
He can only measure time intervals of $$30,\ 60,\ and 90\ seconds$$.
But he cannot measure the time interval of $$50\ seconds$$.

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Re-Attempt Weekly Quiz Competition

Motion and Time Test - 12

Result

Motion and Time Test - 12

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SHARING IS CARING

Question 1

$$100\ years$$

$$100\ months$$

$$100\ seconds$$

$$100\ weeks$$

Solution

Question 2

$$10^{-12}s$$

$$10^{-9}s$$

$$10^{-3}s$$

None of these

Solution

Question 3

Stop watch

Wall clock

Simple pendulum

Reflection of an object by sun rays

Solution

Question 4

60480

604800

6048000

6048

Solution

Question 5

Meter scale

Pulley

Simple pendulum

Speedometer

Solution

Question 6

The car moves initially with a constant speed and then slows down

The car accelerates initially and then moves with a constant speed

The car starts from rest and keeps accelerating

The car moves with a constant speed all along

Solution

Question 7

Solar day

Mean solar day

1 hour

None

Solution

Question 8

Solar day

Hour

Mean solar day

All

Solution

Question 9

uniform motion

non-uniform motion

either uniform or non-uniform motion

neither uniform nor non-uniform motion

Solution

Question 10

$$30\ seconds$$

$$60\ seconds$$

$$50\ seconds$$

$$90\ seconds$$

Solution

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