Hydrogen gas can be conveniently used as a fuel for running vehicles if it is absorbed at very low temperature by a substance only to be released at the temperature generated by the exhaust. What is that substance found in India?

The most suitable crop for green manuring is

A. potato

B. sugarcane

C. sunhemp

D. gram

The advantage of detergents over soaps is

A. detergents are soluble in water

B. detergents could not givemuch lather

C. detergents give lather even with hard water

D. soaps give lather with only soft water

Consider the following features of newer models of motor cars.
1. Radial tyres
2. Streamlined body
3. Multipoint fuel injection
4. Catalytic converter with exhaust
Which of these features make the new models of motor cars more fuel efficient?

A. 1 and 2

B. 2 and 3

C. 2, 3 and 4

D. 1, 3 and 4

Bakelite is a co-polymer of phenol and

A. formaldehyde

B. acetaldehyde

C. benzaldehyde

D. cinnamaldehyde