Slope of work time graph is equal to____________________?
(A) displacement
(B) acceleration
(C) power
(D) energy
The relation between horse power and watt is_________________?
(A) 1 hp = 546 watts
(B) 1 hp = 746 watts
(C) 1 hp = 1000 watts
(D) 1 hp = 946 watts
An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is_________________?
(A) 3.5 x 103 J
(B) 3.5 x 104 J
(C) 3.5 x 106 J
(D) 3.5 x 109 J
Which of the following types of force can do no work on the particle on which it acts ?
(A) frictional force
(B) gravitational force
(C) elastic force
(D) centripetal force
A field in which the work done in a moving a body along closed path is zero is called________________?
(A) electric field
(B) conservative field
(C) electromagnetic field
(D) gravitational field
On a clear day at noon the solar energy reaching the earth is ____________________?
(A) 1.44kw/m2
(B) 1.4kw/m2
(C) 1 kw/m2
(D) none
The dot product of force and velocity is__________________?
(A) power
(B) work
(C) impulse
(D) torque
A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference ?
(A) man does more work than child
(B) child does more work than man
(C) both do the same amount of work
(D) it is a foolish question