A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the
- A. 80%
- B. 75%
- C. 50%
- D. 33%
A man weight 800N climbs up a stairs to height of 15m in 12.5s. What is the man”s average power output?
- A. 667W
- B. 810W
- C. 960W
- D. 15000W
A stone, Q is thrown with velocity U at an angle of 75o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15o to the horizontal. The ranges covered by the stones will be
- A. greater for Q
- B. greater for R
- C. the same for Q and R
- D. greater for the heavier of the two stones
A body starts from rest and moves with uniform acceleration of 6ms-2. What distance does it cover in the third seconds
- A. 15m
- B. 18m
- C. 27m
- D. 30m
A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall
- A. in front of his palm
- B. behind his palm
- C. beside his palm
- D. into his palm
Which of the following affects the period of a simple pendulum? i. mass of the pendulum bob. ii. length of the pendulum. iii. acceleration due to gravity.
- A. i, ii, and iii
- B. ii and iii only
- C. i and iii only
- D. i and ii only
What is the least possible error in using a rule graduated in centimeters?
- A. 0.1cm
- B. 0.5cm
- C. 1.0cm
- D. 2.0cm