7th Grade > Physics
MOTION AND TIME MCQs
Total Questions : 115
| Page 4 of 12 pages
Answer: Option D. -> Speed:- metre/second
Time:- second
:
D
Speed is the ratio of the distance an object covers to the amount of time taken by that object to cover that distance.
Speed = Distance/Time
The S.I. unit of distance is metre (m) while time is measured in second (s).So, S.I. unit of speed will be metre (m)/second (s).
Other larger units of time are hours and minutes while for distance it is kilometre.
:
D
Speed is the ratio of the distance an object covers to the amount of time taken by that object to cover that distance.
Speed = Distance/Time
The S.I. unit of distance is metre (m) while time is measured in second (s).So, S.I. unit of speed will be metre (m)/second (s).
Other larger units of time are hours and minutes while for distance it is kilometre.
Answer: Option D. -> non-uniform
:
D
When body covers unequal distances in equal intervals of time, it is said to be innon-uniform motion.
Uniform motionis the kind of motionin which a body covers equal distances in equal intervals of time.
Periodic motion is amotionwhich is repeated in equal intervals of time.
Oscillationis the to and fro motion of a bodyin a steady and uninterrupted manner.
:
D
When body covers unequal distances in equal intervals of time, it is said to be innon-uniform motion.
Uniform motionis the kind of motionin which a body covers equal distances in equal intervals of time.
Periodic motion is amotionwhich is repeated in equal intervals of time.
Oscillationis the to and fro motion of a bodyin a steady and uninterrupted manner.
Answer: Option A. -> Distance travelled by light in 1299792458 s in vacuum.
:
A
The speed of light is constant throughout the vacuum. Hence it is a suitable standard and can be taken as reference for measurement of distance. The speed of light is 299792458ms−1in a vacuum.
We know, speed=distancetime⇒time=distancespeed
Given, distance =1m
∴time=1299792458s
i.e.,One meter is the distancetravelled by light in 1299792458sin vacuum.
:
A
The speed of light is constant throughout the vacuum. Hence it is a suitable standard and can be taken as reference for measurement of distance. The speed of light is 299792458ms−1in a vacuum.
We know, speed=distancetime⇒time=distancespeed
Given, distance =1m
∴time=1299792458s
i.e.,One meter is the distancetravelled by light in 1299792458sin vacuum.
Answer: Option B. -> False
:
B
When two people are sitting inside a moving car, their position changes with respect to a person standing outside. However, one person is in the same position when viewed from the other person's point of view. Hence, that person is considered to be at rest. Thus, the given statement is false.
:
B
When two people are sitting inside a moving car, their position changes with respect to a person standing outside. However, one person is in the same position when viewed from the other person's point of view. Hence, that person is considered to be at rest. Thus, the given statement is false.
Answer: Option A. -> rectilinear
:
A
The type of motion in which a body moves in a straight line is called 'rectilinear motion'.
:
A
The type of motion in which a body moves in a straight line is called 'rectilinear motion'.
Answer: Option B. -> Hourglass
:
B
An hourglass, also called asand clockor a sandglass,is an instrumentthat measures time. It consists of two glass bulbs which are connected vertically by a narrow opening that allows the sand to tricklefrom the upper bulb to the lower one.
On the other hand, ametre scale measures the length of an object. A thermometer measuresthe temperature of a body. A beam balancemeasures mass.
:
B
An hourglass, also called asand clockor a sandglass,is an instrumentthat measures time. It consists of two glass bulbs which are connected vertically by a narrow opening that allows the sand to tricklefrom the upper bulb to the lower one.
On the other hand, ametre scale measures the length of an object. A thermometer measuresthe temperature of a body. A beam balancemeasures mass.
Answer: Option A. -> Speed
:
A
When a body A is moving faster than another body B, it means that body A covers more distance than body B at the same time.
This means that the ratio of distance to time is greater for body A.
The ratio of distance to time is speed.
Hence, the quantity that indicates whether a body is moving faster than another body is speed.
:
A
When a body A is moving faster than another body B, it means that body A covers more distance than body B at the same time.
This means that the ratio of distance to time is greater for body A.
The ratio of distance to time is speed.
Hence, the quantity that indicates whether a body is moving faster than another body is speed.
Answer: Option B. -> 70 km
:
B
From definition of speed,
Distance = Speed × Time
The total distance will be the sum of the distances travelled in both the time intervals.
In the first part of motion,
Speed=20kmh−1,Time=2s
Distance travelled:
D1=20×2=40km
In the second part of motion,
Speed=30kmh−1,Time=1s
Distance travelled:
D2=30×1=30km
Hence, total distance: D=D1+D2=70km
:
B
From definition of speed,
Distance = Speed × Time
The total distance will be the sum of the distances travelled in both the time intervals.
In the first part of motion,
Speed=20kmh−1,Time=2s
Distance travelled:
D1=20×2=40km
In the second part of motion,
Speed=30kmh−1,Time=1s
Distance travelled:
D2=30×1=30km
Hence, total distance: D=D1+D2=70km
Answer: Option B. -> 10
:
B
36kmh−1=36km1h=36×1000m1×60×60s
[1km=1000mand1h=60×60s]
∴36kmh−1=360003600ms−1
=10ms−1.
:
B
36kmh−1=36km1h=36×1000m1×60×60s
[1km=1000mand1h=60×60s]
∴36kmh−1=360003600ms−1
=10ms−1.
Answer: Option D. -> Non-Linear motion
East direction
:
D
When abody moves in a straight line with respect to time, it is known as linear or rectilinear motion. In the given question, Kavita changes her direction once, so this is a non-linear motion.
Initially, she was facing northwards. When she turns right, she will now be facing in the east direction.
:
D
When abody moves in a straight line with respect to time, it is known as linear or rectilinear motion. In the given question, Kavita changes her direction once, so this is a non-linear motion.
Initially, she was facing northwards. When she turns right, she will now be facing in the east direction.
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