7th Grade > Physics
MOTION AND TIME MCQs
Total Questions : 115
| Page 5 of 12 pages
Answer: Option A. -> Towards the bus
:
A
It's mentioned that the traffic light is in the line of sight of the driver. This suggests that for an observer outside the bus, the bus is moving towards the traffic light.
However, since you are in the bus, the traffic light moves towards you. Or, we can say that the traffic light moves towards the bus from your point of view.
:
A
It's mentioned that the traffic light is in the line of sight of the driver. This suggests that for an observer outside the bus, the bus is moving towards the traffic light.
However, since you are in the bus, the traffic light moves towards you. Or, we can say that the traffic light moves towards the bus from your point of view.
Answer: Option C. -> Odometer
:
C
Odometer is an instrument used to measure the distance travelled by a vehicle.
A metre scale is used to measure length. However, it cannot continuously capture the information on how much distance is covered, making it unsuitable for the purpose of measuring distance covered by vehicle.
A speedometer measures the speed of a vehicle.
A thermometer is used to measure temperature.
:
C
Odometer is an instrument used to measure the distance travelled by a vehicle.
A metre scale is used to measure length. However, it cannot continuously capture the information on how much distance is covered, making it unsuitable for the purpose of measuring distance covered by vehicle.
A speedometer measures the speed of a vehicle.
A thermometer is used to measure temperature.
Answer: Option D. -> The Moon is at rest with respect to a man on Earth.
:
D
To define motion, we need to define 'according to who?'. This means that the concept of motion is meaningless without the reference point.
With respect to a man in space, the Earth seems to be moving around the Sun. Hence, it is true.
With respect to a man on Earth, the Sun moves. That's seen in the form of sunrise and sunset. Hence, this statement is true.
With respect to a man on Earth, the Moon is moving. Hence, the statement "The Moon is at rest with respect to a man on Earth." is incorrect.
:
D
To define motion, we need to define 'according to who?'. This means that the concept of motion is meaningless without the reference point.
With respect to a man in space, the Earth seems to be moving around the Sun. Hence, it is true.
With respect to a man on Earth, the Sun moves. That's seen in the form of sunrise and sunset. Hence, this statement is true.
With respect to a man on Earth, the Moon is moving. Hence, the statement "The Moon is at rest with respect to a man on Earth." is incorrect.
Answer: Option A. -> 13 hour
:
A
Given:
Speed = 5ms−1
Distance travelled = 6 km = 6000 m.
We know that,
Distance = Speed x Time
⇒Time = DistanceSpeed =6000m5ms−1
⇒Time=1200s
1hr =60min = 3600s
∴1200 s = 12003600 hr =13 hr.
:
A
Given:
Speed = 5ms−1
Distance travelled = 6 km = 6000 m.
We know that,
Distance = Speed x Time
⇒Time = DistanceSpeed =6000m5ms−1
⇒Time=1200s
1hr =60min = 3600s
∴1200 s = 12003600 hr =13 hr.
:
Distance covered by car: 1 Mark
Speed in km/min = 1 Mark
Speed in km/hr = 1 Mark
Steps: 1 Mark
Formula: 1 Mark
Initial reading = 350 km
Final reading = 500 km
Distance covered = 500 - 350 = 150 km
Time taken = 30 minutes
Speed=distancetime=15030=5 km/min
Speed in km/hr = 5×60=300 km/hr
:
Formula: 1 Mark
Result: 1 Mark
Type of motion: 1 Mark
i) The time period of a pendulum is the amount of time it takes to complete 1 oscillation.
Therefore the time period for 12 oscillations in 20 seconds can be calculated as,
Timeperiod=TotaltimeNo.ofoscillations=2012=1.67Seconds
ii) A Pendulum undergoes periodic motion. Periodic motion is a type of motion, in which the objectrepeats its motionin regular intervals of time.
:
Yes/No: 1 Mark
Reason:1 Mark
Examples: 1 Mark
No, all periodic motions are notoscillatory motions. Only those periodic motions in which the object is undergoing a toand fro motion issaid to be oscillatory in nature.
On the other hand, alloscillatory motions are periodic motions.
Examples for Oscillatory Motion:
a. Oscillations of a simple pendulum.
b. Vibrations of a mass attached to a spring.
a)b)
:
Uniform motion: 1.5 Marks
Non-Uniform motion: 1.5 Marks
A body is said to have a uniform motion if it travels equal distances in equal intervals of time, no matter how small or long these intervals may be. Example: A vehicle running at a constant speed of 10m/s, will cover equal distances of 10metres every second, so its motion will be uniform.
A body is said to have a non-uniform motion if it travels unequal distances in equal intervals of time, no matter how small these intervals may be.
Example: A freelyfalling ball from a certain height covers unequal distances in equal intervals of time, so its motion is non-uniform.
:
Calculation: 2 Marks
Result: 1 Mark
15 minutes =1560hours = 0.25 hrs
Speed=distancetime
Speed of Sohan =1.20.25 = 4.8 km/hr
Speed of Rohan = 4.5 km/hr
Hence, Sohan is faster than Rohan.