Q: A simple wheel and axle has wheel and axle of diameters of 300 mm and 30 mm, respectively. What is the efficiency of the machine, if it can lift a load of 900 N by an effort of 100 N?/एक साधारण पहिए और धुरी में क्रमश: 300mm और 30mm व्यास वाले पहिए और धुरी है मशीन की दक्षता क्या है यदि वह 100 N के प्रयास से 900 N का भार उठा सकती है?
A.
85%
B.
90%
C.
95%
D.
80%
Correct Answer:
Option B -
Explanations:
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