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Motion and Time Test - 14

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Motion and Time Test - 14
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The meter that is used to measure speed of a vehicle is :
    Solution
    Speedometer is the device used in vehicle to measure speed of that vehicle.
  • Question 2
    1 / -0
    Among the following which was used to measure time in ancient time?
    Solution
    In the ancient time, sundial was used to measure time.
  • Question 3
    1 / -0
    A speedometer typically has a threshold of about 15 km/hr. If the car starts from rest and accelerates, the speedometer will :
    Solution
    Threshold of the speedometer represents the minimum speed of the vehicle by which it must be moving to display the instantaneous speed of the vehicle. Thus, 15 km/hr15 \ km/hr threshold of the speedometer means that it starts reading the speed of the vehicle once the speed reaches 15 km/hr.15 \ km/hr.
  • Question 4
    1 / -0
    Odometer is to mileage as compass is to
    Solution
    An odometer is an instrument used to measure mileage. A compass is an instrument used to determine direction. Choices a, b, and c are incorrect because none is an instrument
  • Question 5
    1 / -0
    The odometer of a car reads 57321.0km57321.0 km when the clock shows the time 08:3008:30 AM. What is the distance moved by the car, if at 08:50AM08:50 AM, the odometer reading has changed to 57336.0km57336.0 km?
    Solution
    An odometer is a device that gives us the distance covered by a car.
    Distance covered by the car in the given time is d=57336.0−57321=15.0 kmd = 57336.0 - 57321 = 15.0 \ km
  • Question 6
    1 / -0
    What is the distance traveled by the body during the first 100 seconds?

    Solution
    According to the graph, the body covers a distance of 100 metres in first 50 seconds and then it further covers a distance of 100 metres in next 50 seconds in return journey. Thus, the body covers a total distance of 200 metres during its motion but the net displacement of the body is zero.
  • Question 7
    1 / -0
    Which of the following is/are correct regarding uniform and non-uniform motion?
    Solution
    Two sentences are correct regarding uniform motion:
    1.1. The body must be moving in a straight line path.
    2.2. The slope of displacement time graph for uniform motion is constant and gives constant velocity.

    In other words, the velocity should be constant, i.e. its direction and magnitude should be constant.
    A car coming to half is an example of non-uniform motion as its speed changes with time, the sentence is correct regarding non-uniform motion
  • Question 8
    1 / -0
    Which of the following is/are good example(s) of non-uniform motion?
    Solution
    An object covering equal distances in equal time interval, i.e. moving with a uniform speed  is said to be in a uniform motion. 

    An object moving in a circular path with uniform speed is said to be in a uniform circular motion.

    Since, in a motion of a pendulum and in a car travelling in an overcrowded zig zag road, the speed of the object is changing and is not uniform, hence they are examples of non-uniform motion.

    SO, both options B and C are correct.
  • Question 9
    1 / -0
    Which is in uniform motion from the following?
    Solution
    The motion of Christiano Ronaldo in the field, motion of Usain Bolt in the race track and the motion of freely falling body are the examples of non uniform motion whereas motion of earth around the sun is the example of uniform motion.
    Thus option C is correct.
  • Question 10
    1 / -0
    Which of the following instrument have very high level of accuracy ?
    Solution
    Electronic stopwatch, stop clock, pendulum clock and hour glass are the instruments used for measuring the time. Among the following, electronic stopwatch has the highest level of accuracy whereas hourglass has the lowest level of accuracy in measuring time.
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