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Which of the following is/are products of wastewater treatment? (a) Biogas (b) Sludge (c) Both biogas and sludge (d) Aerator

c) Both biogas and sludge Explanation Wastewater is collected and passed through bar screens where plastic bags, sticks, cans, napkins,... View Article

Sewage is mainly a (a) liquid waste. (b) solid waste. (c) gaseous waste. (d) mixture of solid and gas.

a) Liquid waste Explanation Sewage is defined as waste water due to which it is a liquid waste. Sewage is actually... View Article

Which of the following is wastewater? (a) Water trickling from a damaged tap. (b) Water coming out of a shower. (c) Water flowing in a river. (d) Water coming out of laundry.

(d) Water coming out of a laundry. Explanation Water discharged during after routine works like washing clothes, flushing toilet, cleaning... View Article

The picture in Figure shows tree line along the sea coast on an island near the equator. As shown, the tree tops are permanently bent in one direction. Are the trees bent towards the sea or away from it? Explain.

In the coastal regions of an island near the equator, heating and cooling of air are a regular phenomenon. During... View Article

Describe an activity to demonstrate that warm air is lighter than cool air.

The experiment to test that warm air is lighter than cool air is:- Take two paper bags of the same... View Article

Suggest some precautions to be taken to prevent the roof of a tin sheet from flying away during a fierce wind storm

Some precautions to prevent the roof of a tin sheet from flying away during a fierce wind storm are given... View Article

When strong/high-speed wind blows, an umbrella held upright at times gets upturned. Explain the reason.

High speed wind passing over the umbrella creates low pressure. Therefore, the umbrella upturns Explanation high-speed winds have low pressure... View Article

Paheli kept an empty bottle made of plastic inside a refrigerator. After few hours, when she opened the refrigerator she found the bottle had collapsed. Explain the possible reason.

The air inside the bottle contracts due to low temperature hence the bottle collapses due to the outside pressure. Explanation... View Article

A flag mounted on a flag post near the sea coast flutters in the direction of sea. At what time of the day does this happen – at midnight or in the afternoon?

In this scenario, the flag will flutter in the direction of sea when it is midnight because at nighttime the sea... View Article

Figure shows a diagrammatic representation of trees in the afternoon along a sea coast. State on which side is the sea; A or B? Give reasons for your choice.

The sea is on the side ‘B’ because at the daytime the wind is coming from that side and as... View Article

A flat in Mumbai with a balcony facing the sea has some clothes hung on a clothesline in the balcony. Towards which direction the clothes will be blown in the afternoon? Explain.

In the afternoon time the land gets heated much faster than sea and hence the air above the land traps... View Article

Why is it advisable not to shut all the doors and windows during a storm?

In order to avoid the roof from getting blown away due to the low pressure created by heavy wind. Explanation... View Article

To expel hot air out of the kitchen, ‘A’ has an exhaust fan fitted on the window of her kitchen and ‘B’ has a similar exhaust fan fitted on the wall near the ceiling of her kitchen. Which of the exhaust fan will expel the hot air more effectively? Explain why?

In the kitchen of ‘B’ ,warm air rises up and her exhaust fan is at standard height as comparison to,... View Article

State whether the following statement is True or False. Warm air is lighter than cool air.

False Explanation Warm air is lighter than cold air because they have more heat energy, which results in the increase... View Article

State whether the following statement is True or False. The coastline of India is not vulnerable to cyclones.

False Explanation The coastlines of India are highly vulnerable to cyclones and also the east coast is more vulnerable to... View Article

State whether the following statement isTrue or False. A very high-pressure system, with very high-speed wind surrounding it forms a cyclone.

False Explanation A cyclone is a natural disaster caused by the warming of air by water vapors through ocean and... View Article

State whether the following statement is True or False: If wind flows from land to the ocean, then it is daytime.

False. Explanation If wind flows from ocean to the land then it is daytime and is called sea breeze, because... View Article

Fill in the blanks. (i) Air around us exerts ______ . (ii) The moving air is called _ . (iii) The main cause of wind movement is uneven _ on the earth. (iv) High speed wind can cause cyclone in regions of _____ pressure.

(i). Pressure (Atmospheric pressure) We know that particles in the air keep on moving and they never stop the same... View Article

Name the ocean which is mainly responsible to bring rain-bearing monsoon winds to Kerala coast in June every year?

The Indian Ocean is the main reason for monsoon because due to sea breeze phenomena the warm air above land... View Article

Why is Chandigarh unlikely to be affected by a cyclone?

Chandigarh is most unlikely to be affected by cyclone because it is not near to coastal line and has no... View Article

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