Tick True/False against the following statements :
(a) Fossil fuels can be made in the laboratory. (T/F)
(b) CNG is more polluting fuel than petrol. (T/F)
(c) Coke is almost pure form of carbon. (T/F)
(d) Coal tar is a mixture of various substances. (T/F)
(e) Kerosene is not a fossil fuel. (T/F)
(a) False
This statement is false because the fossil fuels are made up of natural processes.
(b) False
This statement is false because CNG is a clean fuel. It does not produce any harmful gases behind whereas the petrol does.
(c) True
This statement is true because coke is the pure form of the carbon. Carbon is found in many forms like coal, petroleum and coke.
(d) True
This statement is true because coal tar is not the pure form of carbon. It is made up of the mixing of different substances.
(e) False
This statement is false because kerosene oil is also a fossil fuel. The process of making fossil fuel takes much time. Ti is made up of dead vegetation which burried deep in the soil by the natural activities.
Describe with the help of a diagram an instrument which can be used to detect a charged body.
Sketch larynx and explain its function in your own words.
Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.
Make a labelled diagram of a candle flame.
What is metamorphosis? Give examples.
The following Table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.
Make sketches of animal and plant cells. State three differences between them.
What is a constellation? Name any two constellations.
Describe the construction of a kaleidoscope.
Complete the crossword with the help of clues given below:
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.
Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.
Boojho made the following sketch (Fig. 17.29) of the solar system. Is the sketch correct? If not, correct it.
List conditions under which combustion can take place.
At an individual level, how can you help reduce air pollution?
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
Give two examples of each.
(a) Kharif crop
(b) Rabi crop
Make a labelled diagram of a candle flame.
In which female reproductive organ does the embryo get embedded?
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be :
(a) Wet marble floor, dry marble floor, newspaper and towel.
(b) Newspaper, towel, dry marble floor, wet marble floor.
(c) Towel, newspaper, dry marble floor, wet marble floor.
(d) Wet marble floor, dry marble floor, towel, newspaper
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room. Explain.
The bulb does not glow in the setup shown in Fig.14.10. List the possible reasons. Explain your answer.