Here are 10 one-word answer type questions from the topic Measuring Speed with their answers and explanations:
Topic: Measuring Speed
Measuring Speed involves calculating how fast an object is moving by measuring the distance it covers in a specific time. It is measured using the formula Speed = Distance ÷ Time. Devices like the speedometer are used for direct speed measurement.
1. Question: What is the formula used to calculate speed?
Answer: Distance/Time
Explanation: Speed is calculated by dividing the distance travelled by the time taken.
2. Question: Which device is used in vehicles to show the speed directly?
Answer: Speedometer
Explanation: A speedometer is fitted in vehicles to measure and display the speed in km/h or m/s.
3. Question: What is the basic unit of speed in the SI system?
Answer: m/s
Explanation: The basic unit of speed is metre per second, written as m/s.
4. Question: What is the term used for speed when the distance covered is divided by total time taken?
Answer: Average
Explanation: Average speed is the total distance divided by total time taken, used when speed is not constant.
5. Question: What is the speed of a rocket while launching satellites, as per the textbook example?
Answer: 8 km/s
Explanation: Rockets travel at a very high speed of around 8 kilometres per second to launch satellites.
6. Question: What is measured by an odometer in a vehicle?
Answer: Distance
Explanation: Odometer is used to record the total distance covered by a vehicle.
7. Question: What kind of speed is observed when an object covers unequal distances in equal time intervals?
Answer: Non-uniform
Explanation: Non-uniform speed means the object’s speed keeps changing during motion.
8. Question: Which type of speed is represented by a straight line in a distance-time graph?
Answer: Uniform
Explanation: A straight line in a distance-time graph shows uniform speed, meaning the speed is constant.
9. Question: Which small time intervals are measured in scientific research clocks?
Answer: Microseconds
Explanation: Scientific clocks can measure very small time intervals like microseconds (one millionth of a second).
10. Question: What is the speed of a tortoise as mentioned in the textbook?
Answer: 8 cm/s
Explanation: The tortoise moves very slowly at a speed of about 8 centimetres per second.
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