Which of the following represents the correct decreasing order of boiling points of the given liquids.
A Paraffin wax > Diesel > Kerosene > Petrol
B Diesel > Kerosene > Petrol > Paraffin wax
C Kerosene > Petrol > Paraffin wax > Diesel
D Petrol > Paraffin wax > Diesel > Kerosene
Select the incorrect statements among the following:
(i) Bitumen is used for metalling the roads.
(ii) Some inexhaustible natural resources like coal, petroleum and natural gas formed from the dead remains of living organisms are known as fossil fuels.
(iii) Many useful substances are obtained from coal (commercial importance), so it is also called as ‘Black gold’.
(iv) Natural gas is used as a starting material for the manufacture of a number of chemicals and fertilisers.
A (i) and (ii) only
B (ii) and (iii) only
C (ii) and (iv) only
D (i), (ii) and (iv) only
Which of the following adaptations are shown by kangaroo rats?
(i) They possess blubber to insulate body.
(ii) They need to drink lot of water and breathe at a slow rate to conserve water.
(iii) They excrete very concentrated urine.
(iv) They undergo aestivation to cope with heat.
A (iii) and (iv) only
B (i), (iii) and (iv) only
C (ii), (iii) and (iv) only
D (ii) and (iii) only
Consider the following statements and select the option which correctly identifies true (T) and false (F) ones.
(i) North-East India receives very little rain throughout the year, so we can say that climate in North-East India is hot and dry.
(ii) Thick layer of subcutaneous fat, thick skin and a dense feather cover in polar birds like penguins protect them from severe cold weather.
(iii) Polar animals need to conserve water due to water scarcity.
(iv) As we move higher up from sea level temperature becomes lower.
Select the pair of diseases that are caused by contaminated water.
A Cholera and typhoid
B Diarrhoea and common cold
C Pneumonia and typhoid
D Malaria and pneumonia
Which of the following statements are correct?
1. Scratching birds have strong legs with three toes in front and one toe at the back.
2. Perching birds have two toes in front and two at the back. 3. Climbing birds have three toes pointed upwards and one pointed downwards.
4. Wading birds have long legs with spread out toes.
A1 and 4
B2 and 3
C1 and 3
D2 and 4