Class 10 Science 150 Question

1.     Name some sources of direct current.

2.     Which sources produce alternating current?

3.     An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.

4.     List two methods of producing magnetic fields.

5.     When is the force experienced by a current–carrying conductor placed in a magnetic field largest?

6.     Name some devices in which electric motors are used.

7.     When does an electric short circuit occur?

8.     Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

9.     What is a good fuel?

10.            If you could use any source of energy for heating your food, which one would you use and why?

11.            How has the traditional use of wind and water energy been modified for our convenience?

12.            What is geothermal energy?

13.            What are the advantages of nuclear energy?

14.            Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?

15.            What are the qualities of an ideal source of energy?

16.            What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?

17.            Give any two ways in which biodegradable substances would affect the environment.

18.            Give any two ways in which non-biodegradable substances would affect the environment.

19.            What is the role of decomposers in the ecosystem?

20.            What is ozone and how does it affect any ecosystem?

21.            What are the problems caused by the non-biodegradable wastes that we generate?

22.            Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

23.            What would be the advantages of exploiting resources with short-term aims?

24.            Why do you think there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?

25.            Compare the above system with the probable systems in hilly/ mountainous areas or plains or plateau regions.

26.            How can you as an individual contribute or make a difference to the management of (a) forests and wildlife, (b) water resources and (c) coal and petroleum?

27.            Explain the 3R.

28.            What changes would you suggest in your home in order to be environment-friendly?

29.            List five things you have done over the last one week to –

a.     conserve our natural resources.

b.     increase the pressure on our natural resources.

30.            Why should we conserve forests and wildlife?