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7th Grade > Physics

MOTION AND TIME MCQs

Total Questions : 115 | Page 5 of 12 pages
Question 41. Assume you are travelling in a bus. There is a traffic light in the line of sight of the driver. What is the direction in which the traffic light moves from your point of view?
  1.    Towards the bus
  2.    Away from the bus
  3.    To the left
  4.    To the right
 Discuss Question
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.
Question 42. Name the device which is used to measure the distance travelled by a vehicle.
  1.    Metre scale
  2.    Speedometer
  3.    Odometer
  4.    Thermometer
 Discuss Question
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.
Question 43. Which of the following statements is INCORRECT?
  1.    Motion cannot be defined without a reference point.
  2.    The Earth is moving with respect to a man in space.
  3.    With respect to a man on Earth, the Sun is moving.
  4.    The Moon is at rest with respect to a man on Earth.
 Discuss Question
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.
Question 44. The speed of a body is 5 m s1. The time it would take to cover a distance of 6 km is ___ .
  1.    13 hour
  2.    23 hour
  3.    1 hour
  4.    15 hour
 Discuss Question
Answer: Option A. -> 13 hour
:
A
Given:
Speed = 5ms1
Distance travelled = 6 km = 6000 m.
We know that,
Distance = Speed x Time
Time = DistanceSpeed =6000m5ms1
Time=1200s
1hr =60min = 3600s
1200 s = 12003600 hr =13 hr.
Question 45. What is an Odometer and where is it commonly found?  [2 MARK]
 Discuss Question

:
Definition: 1 Mark
Occurrence: 1 Mark
An odometer is a device thatused to measure the distance covered by avehicle.
Odometer along with speedometer is present in most of the vehicles.
What Is An Odometer And Where Is It Commonly Found?  [2 MAR...
Question 46. The odometer of a car reads 350 km when the clock shows the time 12:30 pm. What is the distance moved by car, if at 1 pm, the odometer reading has changed to 500 km? Calculate the speed of the car in km/min during this time. Express the speed in km/hr.  [5 MARKS]
 Discuss Question

:
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
Question 47. A simple pendulum takes 20 seconds to complete 12 oscillations. Calculate its time period. What type of motion does the pendulum undergo?  [3 MARKS]
 Discuss Question

:
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.
A Simple Pendulum Takes 20 Seconds To Complete 12 Oscillatio...
Question 48. All periodic motions are oscillatory motion. Is this statement correct? Give reason and also give two examples of oscillatory motion. [3 MARKS]
 Discuss Question

:
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)All Periodic Motions Are Oscillatory Motion. Is This Stateme...b)All Periodic Motions Are Oscillatory Motion. Is This Stateme...
Question 49. What do you mean by uniform and non-uniform motion? Give an example for each.  [3 MARKS]
 Discuss Question

:
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.
Question 50. Rohan covers a distance of 10 km by running with the uniform speed of 4.5 km/hr. Sohan runs 1.2 km in 15 minutes. Who runs faster?  [3 MARKS]
 Discuss Question

:
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.

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