Consider the following features of newer models of motor cars:1. Radial tyres2. Streamlined body3. Multipoint fuel injection4. Catalytic converter with exhaustWhich of these features make the new models of motor cars more fuel efficient?

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Q:74

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?

1 and 2

2 and 3

2, 3 and 4

1, 3 and 4

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Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R): If no external force acts on a system, its momentum cannot change.
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