7th Grade > Physics
MOTION AND TIME MCQs
Total Questions : 115
| Page 3 of 12 pages
:
Calculation: 1 Mark
Result: 2 Marks
Distance covered by train in 2 hours = 180 km
Or, distance covered in 1 hour = 90 km
Speed of train = 90 km/hr
Speed of train in m/s = 90×518
Speed of train in m/s = 25 m/s
:
Steps: 2 Marks
Result: 1 Mark
Distance covered by Rahul at 4 m/s = 100 m
Time taken to cover this distance = 25 seconds.
Raj started five seconds later but finishes at the same time.
Hence, time taken by Raj to finish the race = 20 seconds
Distance covered by Raj = 100 m
Speed at which Raj ran =Distancetime
=10020
= 5 m/s
:
Motion: 1Mark
Rest: 1Mark
Motion- A body is said to be in a state of motion if it changes its position continuously with respect to its surroundings with the passage of time.
Example: A bus running on a road, a flying bird etc.
Rest- A body is said to be at rest if it does not changes its position continuously with respect to its surroundings with the passage of time.
Example:A book lying on a table.
Answer: Option B. -> speed
:
B
We know that:
Speed=DistanceTime
Here, the object has to cover a certain fixed distance in a shorter span of time.
From the equation above, we understand that greater the speed, lesser is the time taken, provided the distance is constant.
So, in order to cover a certain distance in a shorter time span, the object should have a greater speed.
:
B
We know that:
Speed=DistanceTime
Here, the object has to cover a certain fixed distance in a shorter span of time.
From the equation above, we understand that greater the speed, lesser is the time taken, provided the distance is constant.
So, in order to cover a certain distance in a shorter time span, the object should have a greater speed.
Answer: Option C. -> straight line having 450 to X-axis
:
C
In uniform motion, a body covers an equal distancein equal interval of time.
Hence, the ratio Change in distanceChange in time is constant. When we plot the graph with distance on the Y-axis and time on the X-axis, we see that the points lie along a straight line inclined at450with the x-axis.
:
C
In uniform motion, a body covers an equal distancein equal interval of time.
Hence, the ratio Change in distanceChange in time is constant. When we plot the graph with distance on the Y-axis and time on the X-axis, we see that the points lie along a straight line inclined at450with the x-axis.
Answer: Option B. -> (a) - (ii), (b) - (iii), (c) - (i)
:
B
:
B
- When abody moves in a circular path with respect to time, it is known as circular motion. e.g.the tip of minute hand.
- When abody moves in a straight line with respect to time, it is known as linear motion. e.gthe stone falling from a height.
- When abody moves about its own axis, it is known as rotational motion. e.g.the wheel of the sewing machine.
Answer: Option A. -> 50 km
:
A
Given,
Speed=5kmphand Time=10h
We know that:
Distance =Speed × Time
⇒Distance=5×10=50km.
:
A
Given,
Speed=5kmphand Time=10h
We know that:
Distance =Speed × Time
⇒Distance=5×10=50km.
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