Motion and Time: Class 7 Science Q&A
17 free answers on Motion and Time (Science) for Class 7 students, across CBSE, ICSE and State boards. Includes questions such as “A spaceship travels 36,000 km in one hour. Express its speed in km/s.”, “The basic unit of speed is: (i) km/min (ii) m/min (iii) km/h (iv) m/s”, “What time when distance is 7150 km and speed is 780 km/hr?”
Question & Answer
Questions
- ScienceClass 7CBSE
A spaceship travels 36,000 km in one hour. Express its speed in km/s.
Soln: 36000 km/h= 36000/60*60 = 10 km/s
- ScienceClass 7CBSE
The average age of children in Class VII is 12 years and 3 months. Express this age in seconds.
Soln: 12 years 3 months = 12 × 365 + 3 × 30 = 4470 days = 4470 × 24 × 60 × 60 s = 386208000 s
- ScienceClass 7CBSE
If Boojho covers a certain distance in one hour and Paheli covers the same distance in two hours, who travels at a higher speed?
Soln: Boojho travels at a higher speed; hence he reaches the distance early.
- ScienceClass 7CBSE
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?
Soln: Because their speed will be different from one another.
- ScienceClass 7CBSE
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
Soln: Answer is (a) 5 m/s Explanation: Unit of speed is meter/ second hence the answer is (a) 5 m/s.
- ScienceClass 7CBSE
If we denote speed by S, the 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 x D (c) S = T/D
Soln: Answer is (c) S = 1/TxD Explanation: Option c) is the correction equation because Speed = Distance/Time
- ScienceClass 7CBSE
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
Soln: Answer is (b) 10 m/s Explanation: Speed = Distance / Time Distance = 54km = 54 x1000 = 54000m Time = 90 minutes = 90×60= 5400s Speed = 54000/5400 = 10 m/s
- ScienceClass 7CBSE
Which of the following cannot be used for the measurement of time? (a) A leaking tap. (b) Simple pendulum. (c) Shadow of an object during the day. (d) Blinking of eyes.
Soln: The answer is (d) Blinking of eyes. Explanation: Blinking of the eye is not a periodic phenomenon. Eyes do not blink at a fixed interval of time. Hence Blinking of eyes cannot be used for measurement of time.
- ScienceClass 7CBSE
The basic unit of speed is: (i) km/min (ii) m/min (iii) km/h (iv) m/s
Answer is (iv) m/s
- ScienceClass 7CBSE
. Which of the following relations is correct? (i) Speed = Distance × Time (ii) Speed = Distance/Time (iii) Speed = Time/Distance (iv) Speed = 1/Distance x Time
Solution: Answer is (ii) Speed = Distance/Time
- ScienceClass 7CBSE
Which of the following are not correct? (i) The basic unit of time is second. (ii) Every object moves with a constant speed. (iii) Distances between two cities are measured in kilometres. (iv) The time period of a given pendulum is constant. (v) The speed of a train is expressed in m/h.
Solution: Incorrect statements are: (ii) Every object moves with a constant speed. (iv) The time period of a given pendulum is constant. (v) The speed of a train is expressed in m/h.
- ScienceClass 7CBSE
Classify the following as motion along a straight line, circular or oscillatory motion: (i) Motion of your hands while running. (ii) Motion of a horse pulling a cart on a straight road. (iii) Motion of a child in a merry-go-round. (iv) Motion of a child on a see-saw. (v) Motion of the hammer of an electric bell. (vi) Motion of a train on a straight bridge.
Solution: i) Oscillatory ii) Motion along a straight line iii) Circular motion iv) Oscillatory motion v) Oscillatory motion vi) Motion along a straight line.
- ScienceClass 7All
What time when distance is 7150 km and speed is 780 km/hr?
The time required is approximately 9.17 hours or 9 hours and 10 minutes. Calculate using Time = Distance ÷ Speed: 7150 km ÷ 780 km/h = 9.167 hours. Converting 0.167 × 60 = 10 minutes. This might represent a long-haul flight duration.
- ScienceClass 7All
How do I calculate distance?
Use the formula Distance = Speed × Time. Multiply how fast you're traveling by how long you travel. For example, driving at 70 km/h for 3 hours covers 70 × 3 = 210 km. Ensure your units match if speed is in km/h, time should be in hours.
- ScienceClass 7All
How do you calculate speed, distance, and time?
To calculate these values, identify which two quantities you know and use the appropriate formula: For Speed: Divide the distance traveled by the time taken. If you travel 150 km in 3 hours, your speed is 150 ÷ 3 = 50 km/h. For Distance: Multiply speed by time. If you drive at 80 km/h for 4 hours, you cover 80 × 4 = 320 km. For Time: Divide distance by speed. To travel 200 km at 50 km/h takes 200 ÷
- ScienceClass 7All
What is the speed of 100 km in 1 hour?
The speed is 100 km/h (kilometers per hour). This is calculated by dividing distance by time: 100 km ÷ 1 hour = 100 km/h. This represents a steady highway cruising speed for most vehicles.
- ScienceClass 7All
What is the speed of 60 km in 1 hour?
The speed is 60 km/h. Using the formula Speed = Distance ÷ Time, we get 60 km ÷ 1 hour = 60 km/h. This is a common urban speed limit in many countries