## Class 7 Important Questions for Science – Motion and Time

**NCERT Exemplar Class 7 Science** is very important resource for students preparing for VII Board Examination. Here we have provided **NCERT Exemplar Problems Solutions** along with **NCERT Exemplar Problems Class 7.**

Question from very important topics are covered by **NCERT Exemplar Class 7**. You also get idea about the type of questions and method to answer in your Class 7th examination.

Here you can get **Class 7 Important Questions Science** based on NCERT Text book for Class VII. **Science Class 7 Important Questions** are very helpful to score high marks in board exams. Here we have covered Important Questions on **Motion and Time** for Class 7 Science subject.

**Science Important Questions Class 7** are given below.

### Multiple Choice Questions

- Which of the following cannot be used for measurement of time?
- (a) A leaking tap.
- (b) Simple pendulum.
- (c) Shadow of an object during the day.
- (d) Blinking of eyes.

- Two clocks A and B are shown in Figure 13.1. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks?

- (a) A time interval of 30 seconds can be measured by clock A.
- (b) A time interval of 30 seconds cannot be measured by clock B.
- (c) Time interval of 5 minutes can be measured by both A and B.
- (d) Time interval of 4 minutes 10 seconds can be measured by clock A.

- Two students were asked to plot a distance-time graph for the motion described by Table A and Table B.

The graph given in Figure 13.2 is true for- (a) both A and B.
- (b) A only.
- (c) B only.
- (d) neither A nor B.

- A bus travels 54 km in 90 minutes. The speed of the bus is
- (a) 0.6 m/s
- (b) 10 m/s
- (c) 5.4 m/s
- (d) 3.6 m/s

- If we denote speed by S, distance by D and time by T, the relationship between these quantities is
- (a) S = D × T
- (b) T = S / D
- (c) S = 1 / T * D
- (d) S = T / D

- Observe Figure 13.3.

The time period of a simple pendulum is the time taken by it to travel from- (a) A to B and back to A.
- (b) O to A, A to B and B to A.
- (c) B to A, A to B and B to O.
- (d) A to B.

- Fig. 13.4 shows an oscillating pendulum.

Time taken by the bob to move from A to C is t_{1}and from C to O is t_{2}. The time period of this simple pendulum is- (a) (t
_{1}+ t_{2}) - (b) 2 (t
_{1}+ t_{2}) - (c) 3 (t
_{1}+ t_{2}) - (d) 4 (t
_{1}+ t_{2})

- (a) (t
- The correct symbol to represent the speed of an object is
- (a) 5 m/s
- (b) 5 mp
- (c) 5 m/s
^{-1} - (d) 5 s/m

- Boojho walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is
- (a) 8.3
- (b) 7.2
- (c) 5
- (d) 3.6

### Very Short Answer Type Questions

- A simple pendulum is oscillating between two points A and B as shown in Figure 13.5. Is the motion of the bob uniform or non-uniform?

- Paheli and Boojho have to cover different distances to reach their school but they take the same time to reach the school. What can you say about their speed?
- If Boojho covers a certain distance in one hour and Paheli covers the same distance in two hours, who travels in a higher speed?

### Short Answer Type Questions

- Complete the data of the table given below with the help of the distance-time graph given in Figure 13.6.

- The average age of children of Class VII is 12 years and 3 months. Express this age in seconds.
- A spaceship travels 36,000 km in one hour. Express its speed in km/s.
- Starting from A, Paheli moves along a rectangular path ABCD as shown in Figure 13.7. She takes 2 minutes to travel each side. Plot a distance-time graph and explain whether the motion is uniform or non-uniform.

- Plot a distance-time graph of the tip of the second hand of a clock by selecting 4 points on x-axis and y-axis respectively. The circumference of the circle traced by the second hand is 64 cm.

### Long Answer Type Questions

- Given below as Figure 13.8 is the distance-time graph of the motion an object.

- (i) What will be the position of the object at 20s?
- (ii) What will be the distance travelled by the object in 12s?
- (iii) What is the average speed of the object?

- Distance between Bholu’s and Golu’s house is 9 km. Bholu has to attend Golu’s birthday party at 7 o’clock. He started from his home at 6 o’clock on his bicycle and covered a distance of 6 km in 40 minutes. At that point he met Chintu and he spoke to him for 5 minutes and reached Golu’s birthday party at 7 o’clock. With what speed did he cover the second part of the journey? Calculate his average speed for the entire journey.
- Boojho goes to the football ground to play football. The distance time graph of his journey from his home to the ground is given as Figure 13.9.

- (a) What does the graph between point B and C indicate about the motion of Boojho?
- (b) Is the motion between 0 to 4 minutes uniform or nonuniform?
- (c) What is his speed between 8 and 12 minutes of his journey?

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### Answers to Multiple Choice Questions

1. (d) | 2. (c) | 3. (a) | 4. (b) |

5. (c) | 6. (a) | 7. (d) | 8. (a) |

9. (b) |

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