(Paper) CTET: Environmental Studies : (Paper-1) - 2011


Central Board of Secondary Education

Central Teacher Eligibility Test : (Paper - 1)

Pervious Paper 2011

(Part-3) Environmental Studies

Directions : Answer the following questions by selecting the most appropriate option.

1. It has been observed that the process of digestion is faster inside the stomach than outside because
(1) the digestive juices inside the stomach are acidic, while outside they are alkaline
(2) the amount of digestive juices produced in the stomach in the presence of food is much more
(3) the digestive juices when kept outside the stomach become inactive
(4) the food is churned in the stomach thereby increasing the surface area for quicker enzyme action

2. Cooked rice can be preserved for a longer time in a refrigerator because
(1) microbes become inactive at low temperature
(2) microbes are destroyed and killed at low temperature
(3) moisture content in the food is reduced at low temperature
(4) refrigerators contain certain chemicals which kill the microbes

3. A lemon sinks in normal water but floats in salty water because the density of
(1) salt water is more than normal water
(2) normal water is more than salt water
(3) lemon increases in salt water
(4) lemon decreases in salt water

4. Malaria can be detected by testing the blood for the presence of
(1) ruptured liver cells in blood
(2) larvae of mosquito in blood
(3) eggs of mosquito in red blood cells
(4) Plasmodium in red blood cells

5. A Shooting Star is a
(1) shining object which moves with a constant speed in the atmosphere
(2) star with a tail at the end
(3) meteoroid which catches fire as it enters the Earth’s atmosphere
(4) star which moves with a constant speed

6. Durga lives in a village and cooks food on a chulha (earthen stove) using wood or cow dung cakes as fuel. She has been suffering from severe cough for the last three months. This may be due to the
(1) carbon monoxide produced by burning fuel which may have been deposited in her respiratory tract
(2) soot produced by burning the fuels which may have been deposited in her respiratory tract
(3) smoke produced by burning fuels which may have caused her allergy
(4) old age and pollution inside and outside her hut

7. A man with blood group ‘O’ marries a woman with blood group ‘A’. The chance of their first child having blood group ‘O’ is
(1) 50%
(2) 100%
(3) 25%
(4) 75%

8. The difference between boiling and evaporation is that
(1) boiling causes a change of state of water while evaporation does not
(2) evaporation can take place at any temperature while boiling cannot
(3) boiling causes reduction in volume of liquid while evaporation does not
(4) changing of boiling liquid into vapor can be seen but evaporation cannot be seen

9. A farmer wanted to separate the grains from the chaff. This can be achieved by the process called
(1) Threshing
(2) Winnowing
(3) Harvesting
(4) Handpicking

10. In rural areas, cow dung is used to coat the floor and walls of huts to
(1) make them smooth and clean
(2) make them rough to increase friction
(3) give a natural colour to the floor
(4) keep the insects away

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Courtesy: cbse.nic.in