1 When comparing the motion of objects, which factor helps us decide if an object is moving slow or fast?
- a) Shape of the object
- b) Color of the object
- c) Size of the object
- d) Speed or distance covered
Answer: d) Speed or distance covered
Explanation: The motion of an object can be classified as slow or fast based on its speed or the distance it covers.
2 What is speed defined as?
- a) The distance covered by an object in a unit time
- b) The time taken by an object to cover a certain distance
- c) The size of an object in motion
- d) The color of an object in motion
Answer: a) The distance covered by an object in a unit time
Explanation: Speed is defined as the distance covered by an object in a specific unit of time.
3 How is the average speed of an object calculated?
- a) Total distance covered × Total time taken
- b) Total distance covered / Total time taken
- c) Total time taken / Total distance covered
- d) Total time taken – Total distance covered
Answer: b) Total distance covered / Total time taken
Explanation: The average speed of an object is calculated by dividing the total distance covered by the object by the total time taken.
4 When an object’s speed keeps changing, its motion is said to be:
- a) Uniform
- b) Non-uniform
- c) Linear
- d) Periodic
Answer: b) Non-uniform
Explanation: When the speed of an object moving along a straight line keeps changing, its motion is considered non-uniform.
5 An object moving along a straight line with a constant speed is said to be in:
- a) Uniform motion
- b) Circular motion
- c) Periodic motion
- d) Non-uniform motion
Answer: a) Uniform motion
Explanation: An object moving along a straight line with a constant speed is said to be in uniform motion.
6 Which of the following is NOT mentioned as a type of motion?
- a) Straight line motion
- b) Circular motion
- c) Periodic motion
- d) Random motion
Answer: d) Random motion
Explanation: There are three types of motion: straight line, circular, and periodic. Random motion is not mentioned as one of the types.
7 Which type of motion is associated with a merry-go-round?
- a) Straight line motion
- b) Circular motion
- c) Periodic motion
- d) Oscillatory motion
Answer: b) Circular motion
Explanation: A merry-go-round is an example of circular motion.
8 What helps us determine whether a vehicle is moving faster or slower?
- a) Color of the vehicle
- b) Size of the vehicle
- c) Distance moved by the vehicle
- d) Number of passengers in the vehicle
Answer: c) Distance moved by the vehicle
Explanation: That the distance moved by objects in a given interval of time can help us decide which object is moving faster or slower.
9 How is speed defined?
- a) Distance covered by an object in a unit time
- b) Time taken by an object to cover a certain distance
- c) Acceleration of an object over time
- d) Force exerted by an object in motion
Answer: a) Distance covered by an object in a unit time
Explanation: Speed is defined as the distance covered by an object in a unit time.
10 What is the meaning of speed when a car is said to be moving at 50 kilometers per hour?
- a) It will cover a distance of 50 kilometers in one hour
- b) It will cover a distance of 50 kilometers in 30 minutes
- c) It will cover a distance of 50 kilometers in two hours
- d) It will cover a distance of 50 kilometers in 45 minutes
Answer: a) It will cover a distance of 50 kilometers in one hour
Explanation: When the speed of a car is mentioned as 50 kilometers per hour, it means that the car will cover a distance of 50 kilometers in one hour.
11 What is the speed calculated in the passage actually referring to?
- a) Instantaneous speed
- b) Maximum speed
- c) Average speed
- d) Terminal speed
Answer: c) Average speed
Explanation: The speed calculated in this context is actually the average speed of the car.
12 Clocks or watches measure time by making use of which type of motion?
- a) Linear motion
- b) Circular motion
- c) Oscillatory motion
- d) Random motion
Answer: c) Oscillatory motion
Explanation: Clocks and watches make use of periodic or oscillatory motion, such as that of a simple pendulum.
13 What is the time period of a pendulum?
- a) The time taken for one oscillation
- b) The time taken for 10 oscillations
- c) The time taken for 20 oscillations
- d) The time taken for 100 oscillations
Answer: a) The time taken for one oscillation
Explanation: The time taken by a pendulum to complete one oscillation is called its time period.
14 How can the time period of a pendulum be measured?
- a) By counting the number of oscillations
- b) By measuring the length of the pendulum
- c) By using a stopwatch or clock
- d) By observing the shadows
Answer: c) By using a stopwatch or clock
Explanation: A stopwatch, table clock, or wristwatch to measure the time period of a pendulum.
15 What is the basic unit of time?
- a) Second (s)
- b) Minute (min)
- c) Hour (h)
- d) Day (d)
Answer: a) Second (s)
Explanation: The basic unit of time is a second.
16 What is the basic unit of speed?
- a) Meter per second (m/s)
- b) Meter per minute (m/min)
- c) Kilometer per hour (km/h)
- d) All of the above
Answer: a) Meter per second (m/s)
Explanation: The basic unit of speed is expressed as meters per second (m/s).
17 How many seconds are there in a day?
- a) 24
- b) 60
- c) 3600
- d) 86400
Answer: d) 86400
Explanation: A day consists of 24 hours, and each hour has 60 minutes, and each minute has 60 seconds. So, there are 24 x 60 x 60 = 86400 seconds in a day.
18 Who noticed that a pendulum of a given length takes the same time to complete one oscillation?
- a) Isaac Newton
- b) Albert Einstein
- c) Galileo Galilei
- d) Nikola Tesla
Answer: c) Galileo Galilei
Explanation: Galileo Galilei noticed that a pendulum of a given length always takes the same time to complete one oscillation.
19 What were some time measuring devices used before pendulum clocks became popular?
- a) Sundials, water clocks, and sand clocks
- b) Quartz clocks, digital clocks, and atomic clocks
- c) Hourglasses, chronometers, and pocket watches
- d) Grandfather clocks, wristwatches, and alarm clocks
Answer: a) Sundials, water clocks, and sand clocks
Explanation: Sundials, water clocks, and sand clocks were used as time measuring devices before pendulum clocks became popular.
20 What is the smallest time interval that can be measured with commonly available clocks and watches?
- a) One minute
- b) One millisecond
- c) One second
- d) One hour
Answer: c) One second
Explanation: The smallest time interval that can be measured with commonly available clocks and watches is one second.
21 What is the basic unit of speed?
- a) Kilometer per hour (km/h)
- b) Centimeter per second (cm/s)
- c) Meter per second (m/s)
- d) Mile per hour (mph)
Answer: c) Meter per second (m/s)
Explanation: The basic unit of speed is meter per second (m/s).
22 What is the purpose of a speedometer in vehicles?
- a) To measure the distance moved by the vehicle
- b) To measure the acceleration of the vehicle
- c) To measure the fuel consumption of the vehicle
- d) To record the speed directly in km/h
Answer: d) To record the speed directly in km/h
Explanation: A speedometer is a meter on the dashboard of vehicles that records the speed directly in km/h.
23 What type of graph is a distance-time graph?
- a) Bar graph
- b) Line graph
- c) Pie chart
- d) Scatter plot
Answer: b) Line graph
Explanation: A distance-time graph is a type of line graph.
24 If the distance-time graph is a straight line, what does it indicate about the object’s motion?
- a) The object is at rest.
- b) The object is accelerating.
- c) The object is decelerating.
- d) The object is moving with a constant speed.
Answer: d) The object is moving with a constant speed.
Explanation: If the distance-time graph is a straight line, it indicates that the object is moving with a constant speed.
25 How is the speed of an object calculated?
- a) Speed = Distance + Time
- b) Speed = Time / Distance
- c) Speed = Distance x Time
- d) Speed = Distance / Time
Answer: d) Speed = Distance / Time
Explanation: The speed of an object is calculated by dividing the distance traveled by the time taken to cover that distance.
26 What is the basic unit of time?
- a) Hour
- b) Minute
- c) Second
- d) Day
Answer: c) Second
Explanation: The passage mentions that the basic unit of time is a second.
27 What can be inferred about an object if its speed keeps changing?
- a) Its distance-time graph will be a straight line.
- b) Its speed will be constant.
- c) Its speed will be zero.
- d) Its distance-time graph can have any shape.
Answer: d) Its distance-time graph can have any shape.
Explanation: If the speed of an object keeps changing, the distance-time graph can have any shape.
28 What can be used to calculate the distance an object would travel in a given time?
- a) Speed
- b) Time
- c) Acceleration
- d) Distance-time graph
Answer: a) Speed
Explanation: By multiplying the speed of an object by time, you can calculate the distance it would travel in a given
29 How is speed calculated?
- a) Speed = Distance × Time
- b) Speed = Time ÷ Distance
- c) Speed = Distance ÷ Time
- d) Speed = Distance + Time
Answer: c) Speed = Distance ÷ Time
Explanation: The speed of an object is calculated by dividing the distance traveled by the time taken.
30 Which of the following units is used to measure speed?
- a) Kilogram
- b) Meter
- c) Second
- d) Liter
Answer: b) Meter
Explanation: Speed is measured in meters per second.
31 What does a speedometer measure?
- a) Distance
- b) Time
- c) Speed
- d) Acceleration
Answer: c) Speed
Explanation: A speedometer measures the speed directly in km/h.
32 What is the distance-time graph for an object moving with a constant speed?
- a) Bar graph
- b) Pie chart
- c) Line graph
- d) Scatter plot
Answer: c) Line graph
Explanation: The distance-time graph for an object moving with a constant speed is a straight line.
33 How can you find the distance traveled by a bus at a specific time from a distance-time graph?
- a) Draw a perpendicular line and find the intersection point.
- b) Draw a parallel line and find the intersection point.
- c) Draw a curved line and find the intersection point.
- d) Draw a vertical line and find the intersection point.
Answer: a) Draw a perpendicular line and find the intersection point.
Explanation: To find the distance traveled at a specific time, you draw a perpendicular line from the time on the x-axis and find the intersection point on the graph.
34 Which scale would be convenient for drawing a graph of a bus’s motion?
- a) 1 km = 1 cm for distance and 1 min = 1 cm for time
- b) 5 km = 1 cm for distance and 1 min = 1 cm for time
- c) 10 km = 1 cm for distance and 1 min = 1 cm for time
- d) 1 km = 5 cm for distance and 1 min = 1 cm for time
Answer: c) 10 km = 1 cm for distance and 1 min = 1 cm for time
Explanation: A scale of 10 km = 1 cm for distance and 1 min = 1 cm for time would be convenient for drawing the graph.
35 What does the slope of a distance-time graph indicate?
- a) Speed
- b) Acceleration
- c) Distance
- d) Time
Answer: a) Speed
Explanation: The slope of a distance-time graph represents the speed of the object. A steeper slope indicates a higher speed.
36 What can be concluded if the distance-time graph is a curved line?
- a) The object is stationary.
- b) The object is moving with constant speed.
- c) The object is accelerating or decelerating.
- d) The object is moving in a straight line.
Answer: c) The object is accelerating or decelerating.
Explanation: If the distance-time graph is not a straight line, the object’s speed is changing, indicating acceleration or deceleration.