Class 7 Exam > Class 7 Notes > Science Class 7 (Old NCERT) > Unit Test: Motion and Time
Unit Test: Motion and Time | Science Class 7 (Old NCERT) PDF Download
Time: 1 hour
Maximum Marks: 30
Attempt all questions.
- Question numbers 1 to 5 carry 1 mark each.
- Question numbers 6 to 8 carry 2 marks each.
- Question numbers 9 to 11 carry 3 marks each.
- Question numbers 12 & 13 carry 5 marks each.
Q1: What is the SI unit of speed? (1 Mark)
(a) km/h
(b) m/s
(c) cm/s
(d) m/min
Q2: Define speed. (1 Mark)
Q3: Which of the following is an example of uniform motion? (1 Mark)
(a) A car moving on a busy road
(b) A bus stopping frequently for passengers
(c) A satellite moving around Earth at a constant speed
(d) A person jogging at varying speeds
Q4: How many seconds are there in one hour? (1 Mark)
Q5: What is the function of a speedometer? (1 Mark)
Q6: Differentiate between uniform motion and non-uniform motion. (2 Marks)
Q7: Convert 36 km/h into m/s. (2 Marks)
Q8: A car moves with a speed of 30 km/h for 20 minutes. Find the distance covered by the car. (2 Marks)
Q9: Explain the working of a simple pendulum and define its time period. (3 Marks)
Q10: A cyclist covers 500 meters in 2 minutes. Find his speed in m/s and km/h. (3 Marks)
Q11: Describe the difference between a speedometer and an odometer. (3 Marks)
Q12: Explain how to construct a distance-time graph and interpret its observations. (5 Marks)
Q13: A car moves with a speed of 50 km/h for 30 minutes and then with a speed of 80 km/h for 45 minutes. Find the total distance covered. (3 Marks)
The document Unit Test: Motion and Time | Science Class 7 (Old NCERT) is a part of the Class 7 Course Science Class 7 (Old NCERT).
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FAQs on Unit Test: Motion and Time - Science Class 7 (Old NCERT)
| 1. What is the difference between speed and velocity? |  |
Ans.Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction. For example, if a car is moving at 60 km/h to the north, its speed is 60 km/h, but its velocity is 60 km/h north.
| 2. How do you calculate average speed? | |
Ans.Average speed can be calculated by dividing the total distance traveled by the total time taken. The formula is: Average Speed = Total Distance / Total Time. For instance, if a car travels 150 km in 3 hours, the average speed is 150 km / 3 h = 50 km/h.
| 3. What is the formula for calculating distance when time and speed are known? | |
Ans.The formula for calculating distance is Distance = Speed × Time. If you know the speed of an object and the time it has been moving, you can easily find the distance traveled. For example, if a cyclist travels at a speed of 20 km/h for 2 hours, the distance would be 20 km/h × 2 h = 40 km.
| 4. How does uniform motion differ from non-uniform motion? | |
Ans.Uniform motion occurs when an object moves at a constant speed in a straight line, meaning the distance covered in equal intervals of time is the same. Non-uniform motion, on the other hand, involves varying speeds or changing directions, resulting in different distances covered in equal intervals of time.
| 5. What is the significance of the time-distance graph? | |
Ans.A time-distance graph visually represents the relationship between time and distance traveled by an object. The slope of the graph indicates the speed; a steeper slope suggests a higher speed, while a horizontal line indicates that the object is stationary. This graph is useful for analyzing motion patterns over time.
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