NCERT Solutions for Class 7th Science
Chapter 13. Motion and Time
Additional Questions With solutions
Additional Questions With solution:
Ques: – Define speed.
Ans: – We call the distance covered by an object in a unit time as the speed of the object.
Ques: – What is non-uniform motion?
Ans: – If the speed of an object moving along a straight line keeps changing, its motion is said to be non-uniform.
Ques: – What is uniform motion?
Ans: – An object moving along a straight line with a constant speed is said to be in uniform motion.
Ques: – Define time period?
Ans: – The time taken by the pendulum to complete one oscillation is called its time period.
Ques: – What is the bob of the pendulum?
Ans: – The metallic ball is called the bob of the pendulum.
Ques: – What is periodic or an oscillatory motion?
Ans: – The to and fro motion of a simple pendulum is an example of a periodic or an oscillatory motion.
Ques: – Name the basic unit of time.
Ans: – The basic unit of time is a second.
Ques: – What tells the speedometer of a car?
Ans: – Speed.
Ques: – What tells the odometer of a car?
Ques: – What is odometer?
Ans: – Another meter that measures the distance moved by the vehicle. This meter is known as an odometer.
Ques: – A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?
Ques :– The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
Distance = 240 km
Taken time = 4 hours
Ques :– Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.