M

Mr. Dubey • 52.30K Points
Coach 

Q. How is friction due to air reduced?

(A) streamlining
(B) lubrication
(C) by using ball bearings
(D) by polishing
Correct : Option (A)

Explanation: 
 friction due to air is considerably reduced by streamlining the shape pf the body moving through air. for example, jets have a streamline shape.

Share

Discusssion

Login to discuss.

Be the first to start discuss.

Related MCQs

Q. In a horizontal engine, reciprocating parts are retarded when the piston moves from

Q. In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

Q. A horizontal load of 120 kg/mt is to be carried by a cable suspended between supports at same level and 60 mts apart. If the maximum permissible tensi

Q. In SI units, thermal conductivity is expressed in

Q. A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw is called

Q. Helical springs are not subjected to

Q. The minimum cranking speed in petrol engines is

Q. 2 TYPICAL CONTROL CIRCUITS FOR SHUNT AND SERIES MOTORS

Q. A disadvantage of using a high frequency ultrasonic transducer is:

Q. A body remains in equilibrium if