Answer the following Questions:
What would be the difference perceived between hearing only two pupils (students) in the class talking to each other and all the children taling to one another at the same time?

Answer the following questions: What are the different ways in which the velocity of a body can be changed? Give one examples in each case.

Answer the following questions : What is the difference between mass and weight of an object ? Will the mass and weight of an object on the earth be the same as their values on Mars ? why ?

Choose the correct atternative answer for each of the following question: What is the difference between the largest and the smallest numbers in the data called ?

Answer the following questions : f the distance between two bodies is increased by a factor of 5, By what factor will the mass of one of them have to be altered, keeping the other mass the same, to maintain the same gravitational force between the two bodies ?

Answer the following questions: Read the following sequence of events and answer the questions based on the same. Ranjit saw that the dog sitting by his side had suddenly become alert. In a short time, Ranjit heard footsteps of a man and the stranger approached Ranjit. Rajit now understood why the dog had suddenly become alert. Name some other animals that can hear sound of frequency not audible to human beings.

Answer the following questions: Read the following sequence of events and answer the questions based on the same. Ranjit saw that the dog sitting by his side had suddenly become alert. In a short time, Ranjit heard footsteps of a man and the stranger approached Ranjit. Rajit now understood why the dog had suddenly become alert. What is the difference between the audible range of sound for Ranjit and the dog?

Take a ball of string . Let one student from the class measure four hand spans of the string and cut it there . Let each of the other students in the class cut four hand-spans of the string , too . Now hold all the pieces together by one end . Are they all of the same length ?

Answer the following questions : Take two similar pages from your notebook. Crumple one paper and allow this and the other paper to fall on the ground simultaneously. What do you observe ?

Questions based on paragraph Study the following activity and answer the questions. Take two aluminium channels of different lengths. Place the lower ends of the channels on the floor and hold their upper ends at the same height. Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance. As the balls roll down which energy is converted into which other form of energy?

Answer the following questions:Make two sufficiently long, identical tubes out of a cardboard. Arrange them on a table, in front of a wall as shown in figure . Place a clock near the end of one of the tubes and try to hear the ticking of the clock at the end of the other tube by placing your ear there. Adjust the angles of the two tubes till you can hear the sound very clearly Measure the angle of incidence theta_1 and the angle of reflection theta_2 . Try to see if they are related in any way. In the experiment, what will happen if you lift one of the tubes to some height?